Cutting fluid filtration, centralized supply and return with zero discharge

There are two types of circulation methods for cutting fluid: single-machine filtration and centralized filtration. Single-machine circulation filtration means that the filtration system of each machine tool is independent. The single-machine circulation filtration system is generally included with the machine tool when it leaves the factory, it is usually relatively simple and has low filtration accuracy, which can only meet the production requirements of low-precision bearings and cannot meet the needs of high-precision, low-noise bearings. This independent filtration circulation method is generally suitable for working conditions where the number of machine tools is small or different cutting fluids are used. For large mechanical processing plants that adopt wet processing, centralized filtration is recommended. The centralized filtration system is the trend of modern wet processing filtration. Compared with the single-machine circulation system, the advantages of centralized filtration are as follows:

1) Small footprint: A large centralized filtration system takes up much less space than single-machine filtration.

2) Easy to manage: The number of points for adding cutting fluid is reduced, which can reduce the number of cutting fluid management personnel. Waste cutting fluid can be treated centrally, causing less environmental pollution; the discharged iron chips are concentrated, which is convenient for transportation and treatment; the use status of cutting fluid can be detected centrally.

3) Filtration accuracy is easy to control;

4) Easy to realize automatic control.

The cutting fluid is transported to the machine tool or automatic production line through the workshop's liquid supply pipeline, and the chips are flushed to the liquid return system. Under the action of the pressure nozzle, the chips and emulsion flow back to the filtration system through overhead pipelines or underground pipeline systems. The emulsion in the filtration system first undergoes rough filtration in the scraper sedimentation tank, and the larger chips are sent to the chip collection box by the scraper conveyor. Then the emulsion is finely filtered by the negative pressure filter, and the purified liquid after two times of filtration is sent back to the workshop by the pump set. The liquid supply pump set of this system adopts variable frequency constant pressure liquid supply technology to ensure the stability of the supply pressure and flow of the entire filtration system. When the number of equipment using cutting fluid in the workshop changes, the pressure in the pipeline will also change, the pressure sensor will send a signal, and the pump set will automatically adjust the flow to keep the pressure in the workshop pipeline system constant. The liquid preparation system consists of a liquid preparation tank, a liquid preparation pump, corresponding pipelines and regulating valves, and can automatically prepare liquid according to the set values. The aeration device regularly aerates the liquid tank to inhibit the growth of anaerobic bacteria and effectively extend the service life of the cutting fluid. The oil removal device automatically removes the floating oil on the liquid surface to avoid corrosion of the cutting fluid by the floating oil. The system is equipped with a liquid level detection system to automatically detect the liquid level and output signals. It is equipped with an automatic water replenishment function to automatically replenish water to the system. The electrical control has four modes: manual/automatic/semi-automatic/holiday cycle to meet the use under different working conditions. During factory breaks and holidays, in order to prevent the cutting fluid from deteriorating due to long-term standing, the system is equipped with an additional recirculation pump. After the system stops running, select the holiday cycle mode on the control panel, and the system will automatically start the recirculation pump to keep the cutting fluid flowing, which can effectively inhibit bacterial growth and greatly extend the service life of the cutting fluid, achieving the purpose of cost saving.

The centralized cutting fluid filtration system centrally supplies and centrally treats the grinding fluid in the production workshop, and can centrally filter, degrease, aerate and sterilize the cooling liquid, and control its concentration, pH value and colony count, thereby ensuring that the cooling liquid does not deteriorate and extending its service life. The centralized filtration and cyclic use of cooling fluid not only reduces production costs, reduces the labor intensity of workers, improves the workshop working environment and reduces environmental pollution, but also realizes the centralized treatment of waste cooling fluid, further reducing environmental pollution. More importantly, the centralized cooling fluid filtration system keeps the quality of the cooling liquid stable for a long time, ensuring the needs of bearing ring grinding processing.

The centralized grinding fluid supply and filtration system has great promotion value. The one-time investment is not large, but the resource saving effect is obvious, the social effect is good, and the requirements for factory building renovation are not high.

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