$1000

Category: Machinery & Equipment/Valves/Other Valves

Company: 苏州世纪行工业科技有限公司

Product Description: A flame-free explosion venting device is a safety apparatus designed to protect equipment and personnel. It automatically shuts down equipment or pipelines in the event of an explosion or fire, preventing the spread of flames or escalation of explosions. Its operational principle involves monitoring changes in gas pressure and temperature inside pipelines or equipment to detect potential explosion or fire hazards. If a threat is confirmed, the device immediately closes the equipment or pipeline while releasing pressure to safeguard both machinery and personnel.Chemical Plant Explosion Venting Device (Flame-Free Explosion Vent) Brief Introduction:1. It consists of two parts: an explosion vent panel and a flame extinguishing module;2. Suitable for indoor equipment dust explosion flame-free venting. High venting efficiency, cost-effective and practical;3. Effectively blocks flames and heat, providing a safe environment for equipment, buildings, and personnel, while also collecting dust to reduce environmental pollution;4. Combined use with an isolation valve not only prevents pressure waves and flames from propagating to upstream workshop areas but also mitigates secondary explosions, reducing property damage and ensuring personnel safety.Product Parameters:Static activation pressure: 0.01 MPa;Frame material: Carbon steel or stainless steel;Flame arrestor material: 304SS;Applicable dust: St1 and St2 dust with Kst ≤ 300 barg·m/s, effective venting area meets explosion venting requirements;Product classification: Based on application scenarios, it can be divided into rectangular flame-free explosion venting devices and curved flame-free explosion venting devices;Applicable equipment: Dust collectors, bucket elevators, drying equipment, cyclone separators, dust collectors;Industries: Wood processing, plastics, spray painting, food and dairy, plastic and dye processing, grain storage and processing, pharmaceuticals, coal processing, brewing, chemicals, metal processing, chemicals, power, cement, and other industries.Chemical Plant Explosion Venting Device (Flame-Free Explosion Vent) Working Principle:The flame-free venting device consists of two parts—an explosion vent panel and a flame extinguishing module. The explosion vent panel responds to rapid increases in deflagration pressure, opening immediately to reduce pressure. When the expanding fireball passes through the open vent panel, it is intercepted by the flame extinguishing module. The precision stainless steel mesh, supported by a frame, acts as a three-dimensional flame trap, extinguishing the flame and preventing propagation, thereby avoiding secondary or multiple explosions. The flame extinguishing module eliminates deflagration flames, reduces hot gas temperature, and captures both burning and unburned dust passing through the open vent panel.Simultaneously, pressure waves or noise generated by production equipment are significantly reduced. As flames pass through the mesh flame arrestor element, heat exchange occurs, rapidly cooling high-temperature flames, venting pressure and smoke, while also reducing pressure waves or noise from production equipment.Application Areas:Widely used in industries such as grain, metallurgy, chemicals, power, light industry, tobacco, pharmaceuticals, machining, and solid waste treatment. Applicable equipment includes cyclone separators, baghouse dust collectors, dust collectors, cartridge filters, pneumatic conveying systems, rod or ball mills, bucket elevators, dryers and ovens, roller grinding, buildings, and more.With increasingly stringent environmental inspections, safety has become a major concern. In the past, explosion vent panels were commonly installed on dust collectors to release overpressure caused by dust explosions. However, installing such devices indoors is not permitted by safety regulations, as it endangers nearby personnel and equipment. Pressure waves and flames from explosions may trigger secondary or multiple explosions, posing risks. Therefore, relying solely on explosion vent panels for dust collectors is unreliable. We recommend using flame-free venting + isolation technology (a cost-effective solution) or suppression + isolation technology to ensure production safety.There are three main methods for dust explosion protection: venting, isolation, and suppression.Venting: Releases explosion pressure in advance through a venting device to protect equipment from damage.Isolation: Uses an isolation valve to block explosions and prevent flame propagation.Suppression: Detection devices identify sparks and trigger fire suppression systems to instantly extinguish flames, preventing explosions. more>

$1000

Category: Machinery & Equipment/Valves/Other Valves

Company: 苏州世纪行工业科技有限公司

Product Description: A flameless venting device is a safety apparatus designed to protect equipment and personnel by automatically shutting down equipment or pipelines during explosions or fires, preventing the spread of flames or expansion of explosions. Its operational principle involves detecting changes in gas pressure and temperature inside pipelines or equipment to determine the risk of explosion or fire. If a hazard is confirmed, it immediately closes the equipment or pipeline while releasing pressure to safeguard both machinery and personnel.Dust Collector Duct Explosion Vent Valve (Flameless Venting Device)Brief Introduction:1. It consists of two parts: an explosion vent panel and a flame extinguishing module;2. Suitable for flameless venting of dust explosions in indoor equipment, offering high venting efficiency and cost-effectiveness;3. Effectively blocks flames and heat, providing a safe environment for equipment, buildings, and personnel, while also collecting dust to reduce environmental pollution;4. Combined use with isolation valves not only prevents pressure waves and flames from propagating to upstream workshop areas but also mitigates secondary explosions, reducing property damage and ensuring personnel safety.Product Parameters:Static opening pressure: 0.01 MPa;Frame material: Carbon steel or stainless steel;Flame arrestor material: 304SS;Applicable dust: St1 and St2 dust with Kst ≤ 300 barg*m/s, with effective venting area meeting explosion venting requirements;Product classification: Based on application scenarios, it can be divided into rectangular flameless venting devices and curved flameless venting devices;Applicable equipment: Dust collectors, bucket elevators, drying equipment, cyclone separators, dust collectors;Industries: Wood processing, plastics, spraying, food and dairy, plastic and dye processing, grain storage and processing, pharmaceuticals, coal processing, brewing, chemicals, metal processing, chemicals, power, cement, and other industries.Dust Collector Duct Explosion Vent Valve (Flameless Venting Device)Working Principle:The flameless venting device consists of two parts—an explosion vent panel and a flame extinguishing module. The explosion vent panel responds rapidly to rising deflagration pressure, opening immediately to reduce pressure. When the expanding fireball passes through the open vent panel, it is intercepted by the flame extinguishing module. The stainless steel precision mesh, supported by a frame, acts as a three-dimensional flame trap, extinguishing the flame to prevent propagation and avoid secondary or multiple explosions. The flame extinguishing module eliminates deflagration flames, reduces the temperature of hot gases, and captures both burning and unburned dust passing through the open vent panel.Simultaneously, pressure waves or noise generated by production equipment are minimized. As flames pass through the mesh flame arrestor, heat exchange occurs between the arrestor and the flames, rapidly cooling the high-temperature flames, venting pressure and smoke, while also reducing pressure waves or noise from production equipment.Application Areas:Widely used in industries such as grain, metallurgy, chemicals, power, light industry, tobacco, pharmaceuticals, machining, and solid waste treatment. Applicable equipment includes cyclone separators, bag dust collectors, dust collectors, cartridge filters, pneumatic conveying systems, rod or ball mills, bucket elevators, dryers and ovens, roller grinding, buildings, and more.With increasingly stringent environmental inspections, safety has garnered greater attention. In the past, explosion vent panels were commonly installed on dust collectors to release overpressure caused by dust explosions. However, installing such devices indoors is not permitted by safety regulations, as it endangers surrounding personnel and equipment. The pressure waves and flames from explosions may trigger secondary or multiple explosions, posing risks. Therefore, relying solely on explosion vent panels for dust collectors is unreliable. We recommend using flameless venting + isolation technology (a more economical solution) or suppression + isolation technology to ensure production safety.There are three main methods for dust explosion protection: venting, isolation, and suppression.Venting: Releases explosion pressure in advance through a pressure relief device to protect equipment from damage.Isolation: Blocks explosions using an isolation valve to prevent flame propagation.Suppression: Detection devices identify sparks and trigger fire suppression systems to instantly extinguish flames, preventing explosions. more>

$1000

Category: Machinery & Equipment/Valves/Other Valves

Company: 苏州世纪行工业科技有限公司

Product Description: A flameless explosion venting device is a safety apparatus designed to protect equipment and personnel by automatically shutting down equipment or pipelines in the event of an explosion or fire, thereby preventing the spread of flames or the escalation of an explosion. Its operational principle involves monitoring changes in gas pressure and temperature within pipelines or equipment to detect potential explosion or fire hazards. Upon confirming a risk, the device immediately closes the equipment or pipeline while releasing pressure to safeguard both machinery and personnel.Pipeline Flameless Vent (Tobacco Dust Explosion Vent Valve)Brief Introduction:1. It consists of two parts: an explosion vent panel and a flame quenching module;2. Suitable for flameless venting of dust explosions in indoor equipment. It offers high venting efficiency and is cost-effective;3. Effectively blocks flames and heat, providing a safe environment for equipment, buildings, and personnel, while also collecting dust to reduce environmental pollution;4. When used in combination with an isolation valve, it not only prevents pressure waves and flames from propagating to upstream workshop areas but also mitigates secondary explosions, reducing property damage and ensuring personnel safety.Product Parameters:Static activation pressure: 0.01 MPa;Frame material: Carbon steel or stainless steel;Flame arrestor material: 304SS;Applicable dust: St1 and St2 dust with Kst ≤ 300 barg*m/s, with effective venting area meeting explosion venting requirements;Product classification: Depending on application, it can be divided into rectangular flameless venting devices and curved flameless venting devices;Applicable equipment: Dust collectors, bucket elevators, drying equipment, cyclones, dust collectors;Industries: Wood processing, plastics, spray painting, food and dairy, plastic and dye processing, grain storage and processing, pharmaceuticals, coal processing, brewing, chemicals, metal processing, chemicals, power, cement, and other industries.Pipeline Flameless Vent (Tobacco Dust Explosion Vent Valve)Working Principle:The flameless venting device consists of two parts—an explosion vent panel and a flame quenching module. The explosion vent panel responds to rapid increases in deflagration pressure by immediately opening to reduce pressure. As the expanding fireball passes through the open vent panel, it is intercepted by the flame quenching module. The stainless steel precision mesh, supported by a frame, acts as a three-dimensional flame trap, extinguishing the flame and preventing its propagation, thereby avoiding secondary or multiple explosions. The flame quenching module eliminates deflagration flames, reduces the temperature of hot gases, and captures both burning and unburned dust passing through the open vent panel.Simultaneously, pressure waves or noise generated by production equipment are significantly reduced. As flames pass through the mesh flame arrestor, heat exchange occurs between the arrestor and the flames, rapidly cooling the high-temperature flames, venting pressure and smoke, while also reducing pressure waves or noise from production equipment.Application Areas:Widely used in industries such as grain, metallurgy, chemicals, power, light industry, tobacco, pharmaceuticals, machining, and solid waste treatment. Applicable equipment includes cyclones, bag dust collectors, dust collectors, cartridge filters, pneumatic conveying systems, rod or ball mills, bucket elevators, dryers and ovens, roller mills, and buildings.With increasingly stringent environmental inspections, safety has become a major concern. In the past, explosion vent panels were commonly installed on dust collectors to release overpressure caused by dust explosions. However, installing such devices indoors is not permitted by safety regulations, as it poses risks to surrounding personnel and equipment. Pressure waves and flames from explosions could trigger secondary or multiple explosions, creating hazards. Therefore, relying solely on explosion vent panels for dust collectors is unreliable. We recommend using flameless venting + isolation technology (a more economical solution) or suppression + isolation technology to ensure production safety.There are three main methods for dust explosion protection: venting, isolation, and suppression.Venting: Releases explosion pressure in advance through a pressure relief device to protect equipment from damage.Isolation: Uses an isolation valve to block the explosion and prevent flame propagation.Suppression: Detection devices identify sparks and trigger fire suppression systems to instantly extinguish flames, preventing explosions. more>

$1000

Category: Machinery & Equipment/Valves/Safety Valves

Company: 苏州世纪行工业科技有限公司

Product Description: 无火焰泄爆装置是一种用于保护设备和人员安全的装置，可以在发生暴炸或火灾时自动关闭设备或管道，防止火势继续蔓延或暴炸扩大。其工作原理是通过检测管道或设备内部的气体压力和温度变化来判断是否存在暴炸或火灾的危险，如果确认存在危险，则会立即关闭设备或管道，同时释放压力，以达到保护设备和人员的目的。无火焰防爆泄压阀(粉尘泄爆装置)简要介绍：1、它由泄爆片和火焰熄灭模板两部分组成；2、适用于室内设备的粉尘暴炸无火焰泄放。泄爆效率高，经济实用；3、能有效阻止火焰和热量，为设备、建筑物和流动人员提供安全的场所，还能有效收集粉尘，减少对环境的污染；4、与隔爆阀的组合使用不但有效防止压力波和火焰传播到上游车间的生产场地，而且遏制了二次暴炸事故的发生，降低了财产损失和保护了人员安全。产品参数：静开启压力：0.01MPa；框架材质：碳钢或不锈钢；阻火材质：304SS；适用粉尘：Kst小于等于300barg*m/s的St1和St2的粉尘，有效泄爆面积满足泄爆要求；产品分类：根据使用工况不同，可分为矩形无焰泄爆装置、弧形无焰泄爆装置；适用设备：除尘器、斗式提升机、干燥设备、旋风分离器、粉尘收集器；应用行业：木材加工、塑料、喷涂、食品和奶制品、塑料及染料加工、谷物存储及加工、制药、煤碳加工、酿酒、化工、金属加工、化学品、电力、水泥等行业。无火焰防爆泄压阀(粉尘泄爆装置)工作原理：无焰泄放装置由两部分组成--防爆板和灭火模块。防爆板对爆燃压力快速升高作出反应，立即打开以减少压力。当膨胀的火球通过打开的防爆板时，被灭火模块阻拦。有框架支撑的不锈钢精密网丝发挥三维火焰捕捉作用，扑灭火焰，保证火焰不被传播，进而造成二次暴炸或多次暴炸。灭火模块消除爆燃的火焰、降低热气体温度，以及捕捉通过开启的防爆板的燃烧和未燃烧的粉尘。同时，生产设备产生的压力波或噪音也会降至微小程度。火焰在通过网状阻火元件时，阻火元件与火焰进行热交换，迅速将高温火焰冷却，泄放压力和烟气，同时，生产设备产生的压力波或噪音也会降低程度。应用领域：广泛的应用在粮食、冶金、化工、电力、轻工、烟草、制药、机械加工、固体废弃物处理等行业领域。应用的设备有旋风分离器、布袋除尘器、粉尘收集器、滤筒过滤器、气力输送、棒式或球磨机、斗式提升机、干燥和烘箱、辊轧研磨、建筑物等。在环保检查越来越严的今天安 全越来越引起人们的重视，在以往我们常采用在除尘器上安装泄暴板来泄放除尘器内因粉尘暴炸产生的过压。但这样安装在室内设备是被安 监所不许可的，因为这样会危害周围人员和周围设备，暴炸产生的压力波和火焰可能会引起二次暴炸或多次暴炸，产生风险。所以除尘器单单采用防爆板是不可-靠的，因此我们建议除尘器采用无焰泄暴+隔离技术(这种方案比较经济)，或抑爆+隔离技术来保护生产的安 全。粉尘防爆主要有三种方式：泄爆、隔爆和抑爆泄爆：通过一种泄压装置将暴炸压力提前释放，保护设备不被损坏。隔爆：通过一种隔爆阀将暴炸阻隔，防止火焰传播下去。抑爆：探测装置探测到形成的火花，然后反馈开启灭火装置，瞬间将火熄灭， 防止暴炸的产生。 more>

$1000

Category: Machinery & Equipment/Valves/Other Valves

Company: 苏州世纪行工业科技有限公司

Product Description: A flameless explosion venting device is a safety apparatus used to protect equipment and personnel. It automatically shuts down equipment or pipelines in the event of an explosion or fire, preventing the spread of flames or the escalation of an explosion. Its working principle involves detecting changes in gas pressure and temperature inside pipelines or equipment to determine the risk of explosion or fire. If a hazard is confirmed, it immediately shuts down the equipment or pipeline while releasing pressure to achieve the goal of protecting both equipment and personnel.Indoor Dust Pipeline Flame Arrester Flameless Explosion Vent ValveBrief Introduction:1. It consists of two parts: an explosion vent panel and a flame extinguishing module;2. Suitable for flameless venting of dust explosions in indoor equipment. It offers high venting efficiency and is cost-effective;3. Effectively blocks flames and heat, providing a safe environment for equipment, buildings, and personnel. It also collects dust efficiently, reducing environmental pollution;4. Combined use with an isolation valve not only prevents pressure waves and flames from propagating to upstream workshop production areas but also suppresses secondary explosions, reducing property damage and ensuring personnel safety.Product Parameters:Static opening pressure: 0.01 MPa;Frame material: Carbon steel or stainless steel;Flame arrestor material: 304SS;Applicable dust: St1 and St2 dust with Kst ≤ 300 barg*m/s, with effective venting area meeting explosion venting requirements;Product classification: Depending on the working conditions, it can be divided into rectangular flameless explosion venting devices and curved flameless explosion venting devices;Applicable equipment: Dust collectors, bucket elevators, drying equipment, cyclones, dust collectors;Industries: Wood processing, plastics, spray painting, food and dairy, plastic and dye processing, grain storage and processing, pharmaceuticals, coal processing, brewing, chemicals, metal processing, chemicals, power, cement, and other industries.Indoor Dust Pipeline Flame Arrester Flameless Explosion Vent ValveWorking Principle:The flameless venting device consists of two parts—an explosion vent panel and a flame extinguishing module. The explosion vent panel responds to the rapid increase in deflagration pressure, immediately opening to reduce pressure. When the expanding fireball passes through the open vent panel, it is intercepted by the flame extinguishing module. The stainless steel precision mesh, supported by a frame, acts as a three-dimensional flame trap, extinguishing the flame and preventing its propagation, thereby avoiding secondary or multiple explosions. The flame extinguishing module eliminates deflagration flames, reduces the temperature of hot gases, and captures both burning and unburned dust passing through the open vent panel.At the same time, pressure waves or noise generated by production equipment are significantly reduced. As flames pass through the mesh flame arrestor element, heat exchange occurs between the element and the flame, rapidly cooling the high-temperature flame, releasing pressure and smoke. Additionally, pressure waves or noise from production equipment are minimized.Application Areas:Widely used in industries such as grain, metallurgy, chemicals, power, light industry, tobacco, pharmaceuticals, machining, and solid waste treatment. Applicable equipment includes cyclones, bag dust collectors, dust collectors, cartridge filters, pneumatic conveying systems, rod or ball mills, bucket elevators, dryers and ovens, roller grinding, and buildings.With increasingly stringent environmental inspections, safety is gaining more attention. In the past, explosion vent panels were commonly installed on dust collectors to release overpressure caused by dust explosions. However, installing such devices indoors is not permitted by safety regulations because it endangers surrounding personnel and equipment. The pressure waves and flames from an explosion could trigger secondary or multiple explosions, posing risks. Therefore, relying solely on explosion vent panels for dust collectors is unreliable. We recommend using flameless venting + isolation technology (a more economical solution) or suppression + isolation technology to ensure production safety.There are three main methods for dust explosion protection: venting, isolation, and suppression.Venting: Releases explosion pressure in advance through a pressure relief device to protect equipment from damage.Isolation: Blocks explosions using an isolation valve to prevent flame propagation.Suppression: Detection devices sense sparks and trigger fire suppression systems to instantly extinguish flames, preventing explosions. more>

$1000

Category: Machinery & Equipment/Agricultural Machinery/Other Agricultural Machinery

Company: 苏州世纪行工业科技有限公司

Product Description: more>

$1000

Category: Machinery & Equipment/Engineering & Construction Machinery/Other Engineering & Construction Machinery

Company: 苏州世纪行工业科技有限公司

Product Description: Powder explosion protection and pressure relief products: explosion vent panels, flameless venting devices, explosion isolation valves, spark detection and extinguishing systems, etc.Flameless venting consists of two components:1) Explosion vent panel;2) Flame quenching module;Bucket Elevator Flameless Vent (Flameless Explosion Vent) Introduction:Effectively prevents flames and heat, providing a safe environment for equipment, buildings, and personnel;Suitable for indoor dust flameless venting equipment;Effectively collects dust without polluting the environment;High venting efficiency, economical and practical;Frame material: carbon steel or stainless steel;Flame arrestor material: 304SSApplicable dust: St1 and St2 dust with Kst ≤ 300 barg*m/s;Effective venting area meets explosion venting requirements;Installation method: mounted flush against equipment or pipelines using flange connections;The explosion vent panel must be replaced after activation;Test reports from domestic authoritative institutions can be provided;Bucket Elevator Flameless Vent (Flameless Explosion Vent) Functions:1. Extinguishes explosion flames—no explosion flames can escape, ensuring a safe operating environment.2. Retains explosion dust—captures process materials, eliminating potential harmful substances from entering the environment.3. Controls explosion pressure—absorbs peak explosion pressure, protecting personnel and the surrounding environment from pressure damage.4. Controls explosion temperature—absorbs the explosion fireball, preventing a significant rise in ambient temperature.Flameless venting consists of two components:1) Explosion vent panel;2) Flame quenching module;Introduction:Effectively prevents flames and heat, providing a safe environment for equipment, buildings, and personnel;Suitable for indoor dust flameless venting equipment;Effectively collects dust without polluting the environment;High venting efficiency, economical and practical;Frame material: carbon steel or stainless steel;Flame arrestor material: 304SSApplicable dust: St1 and St2 dust with Kst ≤ 300 barg*m/s;Effective venting area meets explosion venting requirements;Installation method: mounted flush against equipment or pipelines using flange connections;The explosion vent panel must be replaced after activation;Test reports from domestic authoritative institutions can be provided;Bucket Elevator Flameless Vent (Flameless Explosion Vent) Functions:1. Extinguishes explosion flames—no explosion flames can escape, ensuring a safe operating environment.2. Retains explosion dust—captures process materials, eliminating potential harmful substances from entering the environment.3. Controls explosion pressure—absorbs peak explosion pressure, protecting personnel and the surrounding environment from pressure damage.4. Controls explosion temperature—absorbs the explosion fireball, preventing a significant rise in ambient temperature.Product Features:Static activation pressure: 0.01 MPa.Material: carbon steel / 304 stainless steel.No special maintenance required.Online maintenance structure available, allowing replacement of explosion vent panels and cleaning of flame arrestor elements without disassembling connections.Flange interfaces can be customized.Complies with EN16009 standard, passing standard tests.Offers various flameless venting structures to meet different working condition requirements.No open flame design, effectively preventing significant losses caused by secondary dust explosions.Applicable equipment: dust collectors, bucket elevators, drying equipment, cyclone separators, dust collectors, etc.There are three main methods for dust explosion protection: venting, isolation, and suppression.Venting: Releases explosion pressure in advance through a pressure relief device to protect equipment from damage.Isolation: Prevents flame propagation using an explosion isolation valve.Suppression: Detects sparks with a detection device, then activates a fire extinguishing system to instantly suppress the fire and prevent an explosion.Explosion vent panels are widely used in industries such as grain, metallurgy, chemical, power, light industry, pharmaceuticals, tobacco, machining, and solid waste treatment. Applicable equipment includes cyclone separators, bag dust collectors, dust collectors, cartridge filters, pneumatic conveying systems, rod or ball mills, bucket elevators, dryers and ovens, roller mills, and buildings. They are primarily used in low-pressure,常温 environments with large venting area requirements, such as dust collectors, dust collection pipelines, and elevators.In the past, explosion vent panels were commonly installed on dust collectors to release overpressure caused by dust explosions. However, such installations indoors are not permitted by safety regulations because they endanger surrounding personnel and equipment. The pressure wave and flames from an explosion may cause secondary or multiple explosions, posing greater risks. Therefore, relying solely on explosion vent panels for dust collectors is not reliable. We recommend using flameless venting + isolation technology (a more economical solution) or suppression + isolation technology to ensure production safety. more>

$1000

Category: Machinery & Equipment/Dust Removal Equipment/Dust Removal Equipment

Company: 苏州世纪行工业科技有限公司

Product Description: A flame-free explosion venting device is a safety apparatus used to protect equipment and personnel. It automatically shuts down equipment or pipelines in the event of an explosion or fire, preventing the spread of flames or the escalation of an explosion. Its working principle involves detecting changes in gas pressure and temperature inside pipelines or equipment to determine whether there is a risk of explosion or fire. If a hazard is confirmed, the device immediately shuts down the equipment or pipeline while releasing pressure to achieve the goal of protecting both equipment and personnel.Brief Introduction to Flame-Free Explosion Venting Devices for Dust Collectors in Chemical Plants:1. It consists of two parts: an explosion venting panel and a flame extinguishing module;2. Suitable for indoor equipment dust explosion flame-free venting. High venting efficiency, economical and practical;3. Effectively prevents flames and heat, providing a safe environment for equipment, buildings, and personnel. It also effectively collects dust, reducing environmental pollution;4. Combined use with explosion isolation valves not only effectively prevents pressure waves and flames from propagating to upstream workshop production areas but also suppresses secondary explosion accidents, reducing property damage and ensuring personnel safety.Product Parameters:Static opening pressure: 0.01 MPa;Frame material: Carbon steel or stainless steel;Flame arrestor material: 304SS;Applicable dust: St1 and St2 dust with Kst ≤ 300 barg·m/s, effective venting area meets explosion venting requirements;Product classification: Depending on the working conditions, it can be divided into rectangular flame-free venting devices and curved flame-free venting devices;Applicable equipment: Dust collectors, bucket elevators, drying equipment, cyclones, dust collectors;Application industries: Wood processing, plastics, spraying, food and dairy products, plastic and dye processing, grain storage and processing, pharmaceuticals, coal processing, brewing, chemicals, metal processing, chemicals, power, cement, and other industries.Working Principle of Flame-Free Explosion Venting Devices for Dust Collectors in Chemical Plants:The flame-free venting device consists of two parts—an explosion venting panel and a flame extinguishing module. The explosion venting panel responds to the rapid increase in deflagration pressure, immediately opening to reduce pressure. When the expanding fireball passes through the open venting panel, it is intercepted by the flame extinguishing module. The stainless steel precision mesh supported by a frame acts as a three-dimensional flame trap, extinguishing the flame and ensuring it does not propagate, thereby preventing secondary or multiple explosions. The flame extinguishing module eliminates deflagration flames, reduces the temperature of hot gases, and captures burning and unburned dust passing through the open venting panel.At the same time, pressure waves or noise generated by production equipment are also reduced to a minimal level. When flames pass through the mesh flame arrestor element, heat exchange occurs between the element and the flame, rapidly cooling the high-temperature flame, releasing pressure and smoke. Additionally, pressure waves or noise generated by production equipment are reduced.Application Fields:Widely used in industries such as grain, metallurgy, chemicals, power, light industry, tobacco, pharmaceuticals, mechanical processing, and solid waste treatment. Applicable equipment includes cyclones, bag dust collectors, dust collectors, cartridge filters, pneumatic conveying systems, rod or ball mills, bucket elevators, dryers and ovens, roller grinding, buildings, etc.With increasingly stringent environmental inspections, safety is receiving more attention. In the past, explosion venting panels were commonly installed on dust collectors to release overpressure caused by dust explosions. However, such installations on indoor equipment are not permitted by safety regulations because they endanger surrounding personnel and equipment. The pressure waves and flames from an explosion may cause secondary or multiple explosions, creating risks. Therefore, relying solely on explosion venting panels for dust collectors is unreliable. We recommend using flame-free venting + isolation technology (a more economical solution) or suppression + isolation technology to ensure production safety.There are three main methods for dust explosion protection: venting, isolation, and suppression.Venting: Releases explosion pressure in advance through a pressure relief device to protect equipment from damage.Isolation: Blocks explosions using an isolation valve to prevent flame propagation.Suppression: Detection devices detect sparks and trigger fire suppression systems to instantly extinguish flames, preventing explosions. more>

Negotiable

Category: Others

Company: 东莞市思璞通讯科技有限公司

Product Description: I. Functional Overview 1. Embedded installation, ABS material, mold-integrated molding with an aesthetically pleasing appearance. 2. RJ11 interface, supports connection to digital program-controlled switches or local telephone lines. 3. Hands-free one-touch direct call, built-in 2W speaker, loud and clear call quality. 4. Configurable for automatic call answering and busy tone detection to end calls. 5. Supports hotline dialing via switch or preset number group dialing from the phone. 6. Powered by telephone line feed, no external power supply required. 7. Equipped with status indicator lights showing standby, ringing, and call states. II. Operation and Usage 1. Power On/Off: Controlled via the hands-free button. 2. Answering Calls: When a call comes in, the phone rings. Press the hands-free button to talk or wait for automatic connection. 3. Making Calls: Press the hands-free button to dial. Lightly tap the button to end the call after conversation. III. Main Technical Parameters 1. Supports digital program-controlled switches or local telephone lines with feed voltage of 48-60V. 2. Relative Humidity: 10%~90%; Ambient Noise: ≤100dB(A); Protection: IP55 enclosure rating; Temperature: -20℃~65℃ Atmospheric Pressure: 86~106 Kpa 3. Power Supply: Telephone line feed. 4. Call Distance: ≧90CM; Call Volume: ≧100DB IV. Packaging Dimensions Product Dimensions: 206*116*37.5mm Packaging Materials: EPE foam, carton Gross Weight: 0.5KG Net Weight: 0.35KG more>

$5600

Category: Chemicals/Chemical Intermediates/Intermediate Compounds

Company: 深圳市龙华新区文乔阳贸易商行

Product Description: Waste Oil Decolorization and Deodorization Waste Oil Room Temperature Acid-Alkali-Free Decolorizing AgentWaste oil decolorization and deodorization, waste oil (used engine oil, hydraulic oil, gear oil) decolorization and deodorization without using acids or alkalis, environmentally friendly. This technology can be completed at room temperature without heating, with simple operation. The decolorization and deodorization effects are superior to traditional acid-washing and alkali-washing methods, saving costs and improving efficiency.Contact Number:13954221732Sincerely looking forward to cooperating with you! more>

$1000/1800

Category: Others

Company: 上海西唐生物科技有限公司

Product Description: Vascular Endothelial Growth Factor (VEGF) ELISA Kit(For serum, plasma, tissue homogenate, cell culture supernatant, and other biological fluids)(Product Code: F03060)PrincipleThis experiment uses the double antibody sandwich ABC-ELISA method. Anti-human VEGF monoclonal antibody is coated on the enzyme-labeled plate. VEGF in the standard and sample binds to the monoclonal antibody. Biotinylated anti-human VEGF is added, forming an immune complex attached to the plate. Horseradish peroxidase-labeled Streptavidin binds to the biotin. Substrate working solution is added to develop a blue color, followed by the stop solution. The OD value is measured at 450 nm. The VEGF concentration is proportional to the OD value and can be determined by plotting a standard curve.Kit Components (Store at 2-8°C)Coated Wells96 wellsEnzyme Conjugate12 ml10× Sample Buffer12 ml20× Wash Buffer50 mlStandards: 40 ng/ml1 vialTMB Solution12 mlBiotinylated Antibody6 mlStop Solution12 mlReagent Preparation and Blood Sample Collection1. Dilute the 10× Sample Buffer 1:10 with distilled water (e.g., 1 ml concentrated diluent + 9 ml distilled water).2. Collect specimens: serum, plasma (EDTA, citrate, heparin anticoagulated), cell culture supernatant, tissue homogenate, etc. Test as soon as possible; store at 2-8°C for 48 hours. For longer storage, freeze (-20°C or -70°C) and avoid repeated freeze-thaw cycles.3. Standard solution preparation: Take 8 1.5 ml centrifuge tubes. Add 900 µl of sample buffer to the first tube and 500 µl to tubes 2 to 8. Add 100 µl of 40 ng/ml standard solution to the first tube, mix thoroughly on a vortex mixer, then pipette 500 µl and transfer to the second tube. Repeat this serial dilution, discarding 500 µl from the seventh tube. The eighth tube serves as a blank control.4. Wash Buffer: Dilute 1:20 with distilled water (e.g., 1 ml concentrated wash buffer + 19 ml distilled water).Assay Procedure1. Sample addition: Add 100 µl of standard or test sample to each well. Mix the plate thoroughly and incubate at 37°C for 40 minutes.2. Washing: Wash the plate thoroughly with wash buffer 4-6 times, and blot dry on filter paper.3. Add 50 µl of distilled water and 50 µl of Biotinylated Antibody to each well (except blank). Mix thoroughly and incubate at 37°C for 20 minutes.4. Washing: As before.5. Add 100 µl of Enzyme Conjugate to each well. Incubate the plate at 37°C for 10 minutes.6. Washing: As before.7. Add 100 µl of TMB Solution to each well. Incubate in the dark at 37°C for 15 minutes.8. Add 100 µl of Stop Solution to each well and mix.9. Measure the absorbance at 450 nm using a microplate reader within 30 minutes.Result Calculation and Interpretation1. It is recommended to subtract the blank OD value from all OD values before calculation. If the blank OD is below 0.1, direct calculation may be used.2. Using the standard concentrations of 4000, 2000, 1000, 500, 250, 125, 62.5, and 0 pg/ml as the x-axis and OD values as the y-axis, plot the standard curve using software.3. Calculate the corresponding VEGF concentration based on the sample OD value. Software can be requested from the company via email.Kit Performance1. Sensitivity: The minimum detectable concentration of VEGF is less than 30 pg/ml.2. Specificity: Can detect both recombinant and natural human VEGF. No cross-reactivity with other human cytokines.3. Reproducibility: Intra- and inter-assay coefficients of variation are both less than 10%.Precautions1. It is recommended to run duplicates for both standard and test samples. A standard curve should be included in each assay.2. The washing process is critical. Inadequate washing may lead to precision errors and falsely elevated OD values.3. All reagents should be brought to room temperature before use. After opening, reseal the remaining strips to keep them dry.4. This kit uses a highly sensitive TMB solution. If color development is too intense, precipitation may occur, which is normal and does not affect result interpretation.5. The kit components listed are for a 96-well plate. For a 48-well plate, halve the amounts.6. Store the kit at 4°C. For research use only. Not for clinical diagnosis.The above instructions are for reference only! Please refer to the instructions inside the kit for actual use! more>

$4800

Category: Chemicals/Chemical Intermediates/Intermediate Compounds

Company: 深圳市宝安区文乔阳贸易商行

Product Description: I. Main UsesOil decolorizing and deodorizing agent is suitable for the decolorization of oxidized and discolored oils, non-standard oils, waste engine oil, and dark, foul-smelling diesel. After treatment, the oil becomes clear, transparent, free of flocculants, and odor-free.II. Performance CharacteristicsThis product is a nano-composite material synthesized from various organic chemical raw materials. It features high charge density, high modulus, strong decolorizing and deodorizing capabilities, and powerful purification functions. It effectively removes coke, asphaltenes, unsaturated hydrocarbons, basic nitrogen, organic acids, and impurities from oil. Through organic cross-linking, ion exchange, and re-dissolution, it ensures that the oil does not revert to its original color after decolorization, maintaining the oil's high quality.III. Physical and Chemical IndicatorsItemIndicatorpH Value5--7OdorOdorlessIV. Usage MethodAdd directly to the oil, with a general dosage of 2%.V. Precautions1. Store in a well-ventilated, dry place, and avoid direct sunlight.2. Protect from rain and exposure to intense sunlight during transportation.Contact Number:13782359135We sincerely look forward to cooperating with you! more>

Negotiable

Category: Machinery & Equipment/Packaging Related Equipment/Filling Machinery

Company: 意德机械科技（安丘）有限公司

Product Description: Anqiu Yide Machinery produces an automatic unpacking machine, which is a new type of automatic unpacking and unloading equipment. This device performs bagged material unpacking within a sealed space, preventing dust leakage and enabling "zero-dust" material production.Technical Features of the Automatic Unpacking Machine:1. Compact structure, quick installation, long service life, and easy maintenance.2. The material unpacking and separation process is fully enclosed, with dust removal devices at each stage, ensuring no dust leakage, low noise, and improved working conditions for operators.3. The equipment is suitable for special conditions such as explosion-proof zones, food processing, and handling of toxic substances.4. Does not contaminate materials or affect material quality.5. Specifically designed to separate torn packaging bags from materials, preventing mixing with materials or entanglement in the separation device.Our company manufactures automatic unpacking machines using materials like 304 stainless steel and carbon steel, ensuring high quality, simple structure, and robust equipment.Automatic unpacking machines are widely used in various industries such as chemical, feed, and building materials. They can be integrated with other conveying equipment to directly transport materials after unpacking, streamlining workflows and reducing steps.The company specializes in the research, development, manufacturing, and sales of powder processing equipment including crushers, air jet mills, classifiers, automatic unpacking machines, tubular chain conveyors, and unpacking conveying systems.Yide Machinery Technology (Anqiu) Co., Ltd. is a domestic manufacturer of ultra-fine powder systems. Adhering to the principles of Yide powder technology and "Made in China," the company focuses on meticulous craftsmanship and specializes in the research, development, and innovation of technologies such as powder unpacking, dosing, metering, conveying, and crushing, providing integrated solutions for customers."Yi" signifies aspiration, the direction of the heart; "De" means gaining externally from others and internally from oneself. Contact: 18660657617 Xu more>

Negotiable

Category: Chemicals/Gases/Nitrous Oxide

Company: 深圳市俊基瑞祥科技有限公司上海分公司

Product Description: ECOJOIN Solder is a Korean solder company that has passed ISO9001 international quality system and ISO14001 international environmental management system certifications.ECOJOIN specializes in the research, development, and production of lead-free and halogen-free tin products, including solder paste, solder bars, solder wire, silver paste, type 5 powder solder paste, flux, and other products.Products are supplied to major Korean companies such as LG Electronics, Samsung Electronics, and SK Hynix; ECOJOIN has factories in Anseong City, Korea and Huizhou City, China, and has an office in Japan to provide customers with high-quality products and timely delivery.Details of Korean ECOJOIN Solder Wire:Product BrandECOJOINPlace of OriginKoreaProduct NameLead-Free Solder WireProduct CategorySolderingApplication RangeImproves corrosion issues with soldering iron tips, suitable for hand soldering or machine solderingProduct Performance1. Low smoke and spatter;2. Fast wetting speed;3. Low flux residue;4. Improves corrosion issues with soldering iron tips, suitable for hand soldering or machine solderingShenzhen Junji Ruixiang Technology Co., Ltd.Mr. Zeng 13902983965 (same number for WeChat)Email: zengken@sz-cksc.comWebsite: www.sz-cksc.comAddress: Room 1807, Oriental Plaza, Jianshe Road, Nanhu Street, Luohu District, Shenzhen more>

Negotiable

Category: Chemicals/Chemical Intermediates/Intermediate Compounds

Company: 深圳市俊基瑞祥科技有限公司上海分公司

Product Description: ECOJOIN Solder is a Korean solder company that has passed ISO9001 international quality system and ISO14001 international environmental management system certifications.ECOJOIN specializes in the research, development, and production of lead-free and halogen-free solder products, including solder paste, solder bars, solder wire, silver paste, type 5 powder solder paste, flux, and other related products.The products are supplied to major Korean companies such as LG Electronics, Samsung Electronics, and SK Hynix. ECOJOIN has factories in Anseong, Korea and Huizhou, China, as well as an office in Japan to provide customers with high-quality products and timely delivery.Details of ECOJOIN Solder Bars from Korea:Product BrandECOJOINPlace of OriginKoreaProduct NameLead-Free Solder BarProduct CategorySuitable for wave soldering and dip soldering processes with environmental requirementsApplicationSolder bars for wave soldering / high-temperature solder bars for solder potsProduct Performance1. Low impurity content;2. Excellent oxidation resistance;3. Bright solder joints;4. Moderate pricing;5. Used across all LG Electronics product series.Shenzhen Junji Ruixiang Technology Co., Ltd.Mr. Zeng: 13902983965 (same number for WeChat)Email: zengken@sz-cksc.comWebsite: www.sz-cksc.comAddress: Room 1807, Oriental Plaza, Jianshe Road, Nanhu Street, Luohu District, Shenzhen more>

Negotiable

Category: Hardware & Tools/Welding Materials & Accessories/Other Welding Materials

Company: 深圳市俊基瑞祥科技有限公司上海分公司

Product Description: ECOJOIN is a Korean solder company that has obtained ISO9001 international quality system and ISO14001 international environmental management system certifications.ECOJOIN specializes in the research, development, and production of lead-free and halogen-free tin products, including solder paste, solder bars, solder wire, silver paste, Type 5 powder solder paste, flux, and other related products.Products are supplied to major Korean companies such as LG Electronics, Samsung Electronics, and SK Hynix. ECOJOIN has factories in Anseong, South Korea, and Huizhou, China, as well as an office in Japan to provide customers with high-quality products and timely delivery.Details of ECOJOIN Solder Paste from Korea:Product BrandECOJOINPlace of OriginSouth KoreaProduct NameSolder PasteProduct CategorySolder PasteApplicationPrinting Solder Paste / Dispensing Solder Paste / Pump-Press Solder PasteProduct Performance1. Materials are produced in Korea and used by major companies like LG Electronics;2. Excellent printing formation;3. Long-lasting printability;4. Low flux residue, minimal bubbles after reflow;5. Good wetting effect, effectively addressing solder ball issues.Shenzhen Junji Ruixiang Technology Co., Ltd.Mr. Zeng 13902983965 (same number for WeChat)Email: zengken@sz-cksc.comWebsite: www.sz-cksc.comAddress: Room 1807, Oriental Plaza, Jianshe Road, Nanhu Street, Luohu District, Shenzhen more>

Negotiable

Category: Metallurgy & Minerals/Common Steel/Other Steel Products

Company: 深圳市俊基瑞祥科技有限公司上海分公司

Product Description: Electroloy is a Singapore-based metal refiner, established in 1977. The Electroloy Group is dedicated to developing, producing, and providing comprehensive welding solutions, primarily serving industries such as electronics, semiconductors, and PCB electroplating. The company is certified with ISO9001 and ISO14001. Subsequently, Electroloy expanded its solder products to the southeastern coastal regions of China, earning widespread acclaim in the electronics industry. Key products include solder paste, solder wire, solder bars, flux, and other soldering materials.Electroloy Lead-Free Solder Wire has reached new heights with the help of advanced production techniques and experience. The Electroloy LF-300W series flux-cored solder wires are now used in: no-clean (halide-free and halogen-free) solder wire, micro-diameter solder wire, low-temperature solder wire, and solid solder wire.Details of Electroloy Lead-Free Solder Wire:Product BrandElectroloyPlace of OriginSingaporeProduct NameLead-Free Solder WireProduct TypeNo-clean (halide-free and halogen-free) solder wire, micro-diameter solder wire, low-temperature solder wire, solid solder wireProduct Features1. No-clean solder wire: Electroloy's no-clean solder wire features minimal spatter, rapid wetting, highly reliable solder residues, low smoke and odor, and clean finished products.2. LF-303W / LF-307W / LF-315W micro-diameter solder wire: With enhanced production processes and new flux chemistry, this solder wire is suitable for precise and fine-pitch soldering applications.3. LF-302W low-temperature solder wire: Electroloy has expanded its production capacity for pressed Sn/Bi low-temperature solid lead-free solder wire. This Sn/Bi (LF-302W) low-temperature solder wire has a melting point of 138°C. Its diameter ranges from 0.5mm to 2.0mm, making it suitable for various temperature-sensitive soldering applications.4. Solid solder wire: Electroloy successfully manufactures lead-free alloys such as Sn/Zn, Sn/Ag/Sb, and Sn/Bi for custom and preform soldering applications, available in forms like strips, wires, and rectangles. Other hard-to-draw or non-ductile alloys, such as bearing alloys and fusible alloys based on indium and bismuth, can also be requested.Our company offers free sample trial packs of Electroloy lead-free solder wire. Welcome to visit or contact Shenzhen Junji Ruixiang Technology Co., Ltd. for inquiries.Shenzhen Junji Ruixiang Technology Co., Ltd.Mr. Zeng: 13902983965 (same number for WeChat)Email: zengken@sz-cksc.comWebsite: www.sz-cksc.comAddress: Room 1807, Oriental Plaza, Jianshe Road, Nanhu Street, Luohu District, Shenzhen more>

$5500

Category: Machinery & Equipment/Pumps/Other Pumps

Company: 瑞希特（浙江）科技股份有限公司

Product Description: Industry: Petroleum, Chemical, Pharmaceutical, New Energy, Food, MetallurgyMaterial: Stainless Steel, Polytetrafluoroethylene, Silicon Carbide SSIC, Graphite, Hastelloy-C, etc.Application: Air Conditioning Circulation, Heating and Heating Circulating Water; Fire Water Pressure Boosting; Tap Water Pressure Boosting System; Industrial and Military-Aerospace; Transport of Toxic and Hazardous Liquids in Chemical and Pharmaceutical Industries; Pre-launch Fuel Loading for Aerospace; Nuclear Grade for Nuclear Power PlantsProduct AdvantagesThe P-series electric pump is a new generation designed to international standards through continuous improvement and refinement. *Maximum operating flow 1200 m³/h, *maximum head 600 m, temperature range -120 to 350°C, maximum system design pressure 20 MPa.P-series Electric Pump Advantages① Long lifespan, automatic hydraulic thrust balancing system combined with silicon carbide bearings for high service life;② High efficiency, optimized motor design and efficient hydraulic research for excellent energy efficiency;③ High reliability, advanced processing technology, high-end CNC equipment, and comprehensive testing ensure stable and consistent product quality.④ Equipped with bearing wear monitoring for online monitoring and automated control.⑤ Secondary sealing shell ensures environmental safety in accident conditions.Features and ApplicationsThe electric pump consists of a motor and pump integrated into one unit. The inner surface of the stator and the outer surface of the rotor are covered with a thin-walled non-magnetic corrosion-resistant metal cylinder,completely isolating the stator windings and rotor core from the conveyed medium, preventing erosion by the conveyed liquid. Additionally, the impeller is directly mounted on the rotor's shaft extension, and the entire rotor is submerged in the conveyed liquid with no rotating parts exposed to the outside, making it an absolutely leak-free structure. Thus, it offers the following advantages:① Completely leak-free, making it suitable for conveying liquids harmful to humans, explosive and flammable liquids, valuable liquids, and corrosive liquids.② Completely isolated from external air, making it suitable for conveying liquids that deteriorate upon contact with external gases.③ No shaft seal, making it suitable for high-pressure systems, high-melting-point liquids, high-temperature liquids, and low-temperature liquids.④ No lubrication required, so it does not contaminate the conveyed liquid and avoids the hassle of oil injection and drainage.⑤ Motor and pump are coaxial and integrated, resulting in compact size, light weight, small footprint, and easy disassembly and inspection.⑥ The motor uses water cooling or natural cooling, with no fan, resulting in low vibration and noise during operation. more>

$2500

Category: Instruments & Meters/Weighing Instruments/Other Unclassified

Company: 蚌埠三合电子科技有限公司

Product Description: 3X16 Meter Unattended Weighbridge with 4G Signal Transmission, Computer-Free Self-Service WeighingOverview of Unattended Weighing SystemThis system adopts an automatic weighing method using license plate recognition or IC card identification, with minimal human intervention in the weighing process, thereby reducing cargo loss for owners to the greatest extent, balancing the interests of buyers and sellers during weighing, and improving the service level of weighing operators.Intelligent Weighing System Workflow1. The driver obtains an authorized IC card at the card issuance station (the IC card can be used long-term);2. The driver drives the vehicle to the entrance induction loop to initiate card reading;3. The indicator light changes from green to red;4. After successful card reading and correct information entry, the front barrier gate lifts;5. The driver moves the vehicle onto the weighbridge;6. The vehicle must come to a complete stop between the two pairs of light beams;7. Once the vehicle is stationary, the weight is automatically saved;8. Simultaneously, images captured by the surveillance cameras, such as the front and rear of the vehicle, are recorded;9. The large screen displays the vehicle's weight;10. The rear barrier gate opens, and the driver drives the vehicle off the weighbridge;11. Once the vehicle has completely exited, the barrier gate automatically lowers;12. The traffic light changes from red to green;13. The system waits for the next vehicle to approach the weighbridge.Components of the Fully Automatic Truck Scale Weighing System:1. Electronic License Plate Recognition SystemThe electronic license plate recognition system uses radio frequency identification (RFID) technology to identify vehicles, dynamically capturing electronic license plate information while the vehicle is in motion.2. Video Surveillance SystemSurveillance cameras monitor the weighing process 24/7, recording videos and taking screenshots for archival and future reference.3. Vehicle Control SystemUses induction loop detectors and infrared sensors to detect vehicle positions, enabling automatic lifting and lowering of electronic barrier gates.4. Internet of Things (IoT) SystemUsers can access weighing records, loophole alerts, photos, and real-time video surveillance via Apple phones, Android phones, or web-based statistical software. Internet-based remote pricing and recharge operations are also supported.5. Support for System IntegrationOpen interfaces allow integration with various ERP systems, facilitating centralized management and data-driven decision-making for enterprises.Our company specializes in various weighing equipment and supports customized weighing software and unattended weighing systems.3X16 Meter Unattended Weighbridge with 4G Signal Transmission, Computer-Free Self-Service Weighing more>

$1000

Category: Hardware & Tools/Pipe Fittings/Tee Fittings

Company: 泰安高新区顺鑫网络科技服务中心

Product Description: Working Reset Process of Mine Pneumatic Pressure-Free Air DoorsThe reset process of mine pneumatic pressure-free air doors is an automatic cycle where the system transitions from the "passage state" back to the "standby state," accomplished through the coordinated action of sensor detection, controller commands, and pneumatic drive. The specific steps are as follows:1. Passage Completion DetectionAfter personnel or vehicles completely pass through the air door, infrared sensors (or other sensing devices) on both sides of the door monitor the detection range in real time. Once it is confirmed that there are no remaining targets in the area, an electrical signal indicating "passage completed" is sent to the core controller.If there is continuous obstruction, such as by a long vehicle, the sensors will continue to send signals to ensure the door remains open until the target completely leaves the detection area.2. Delay Program InitiationUpon receiving the "passage completed" signal, the controller automatically initiates a preset delay program (the delay time can be adjusted according to passage needs, typically 5-30 seconds), providing a buffer period to prevent secondary passage within a short time.During the delay period, the door remains open, and the audible and visual warning devices continue to operate (e.g., green light on, warning sound active), indicating that the passage phase is still ongoing.3. Door Closing Command TriggeredAfter the delay period ends, the controller determines that there is no need for secondary passage and immediately sends a door closing command to the pneumatic drive system. The pneumatic valve actuates and switches, stopping the input of compressed air into the cylinder, which then begins to exhaust and depressurize.4. Door Closing ActionThe cylinder piston rod retracts under the release of air pressure, driving the door to slowly rotate and close via a linkage mechanism. During the closing process, the speed control device regulates the action speed (typically taking 5-8 seconds to complete closing), ensuring smooth movement of the door and avoiding impact.When the door closes, the sealing strip between the door frame and the door leaf tightly adheres, achieving effective sealing and maintaining air pressure balance in the ventilation area.5. System Status ResetAfter the door is fully closed, the controller activates the locking device to ensure that air doors on the same side or opposite sides cannot open simultaneously, preventing abnormal airflow. At the same time, the pneumatic system resets to its initial pressure state, and the sensors resume real-time monitoring mode.The audible and visual warning devices turn off, and the entire system enters standby mode, awaiting the next sensing signal to trigger and complete the entire work cycle.Through the above process, mine pneumatic pressure-free air doors can automatically complete the reset from post-passage closing to standby state without manual intervention, ensuring continuous adaptation to the ventilation control needs of complex underground environments. more>