Large Wind Tunnel Test Iron Floor

The Purpose and Importance of Engine Test Iron Floors
Motor testing is a critical process for verifying motor performance and reliability. As the core foundational component of the motor test bench, the test iron floor directly bears the weight of the motor, transmits test loads, and must withstand vibrations and impacts during testing. Improper or unsafe usage can not only lead to a loss of precision and reduced lifespan of the test iron floor but may also cause accidents such as motor tipping, damage to test equipment, and even endanger the safety of operators. The following outlines safety precautions for using test iron floors across four key dimensions—installation, operation, maintenance, and emergency handling—to ensure the safe execution of motor tests.
I. Installation Phase: Building a Solid Safety Foundation
The installation quality of the test iron floor determines its maximum safety performance. Key factors to control include load matching, level calibration, and fixation reliability:
Strictly prohibit overloading: The test iron floor must be selected based on the rated weight of the test motor (including test fixtures). The actual load must not exceed 80% of the floor’s rated load capacity. For example, when testing a large industrial motor weighing 10 tons, a test iron floor with a rated load capacity of ≥12.5 tons should be selected (providing a 25% safety margin) to avoid long-term overloading that could cause surface depression or rib plate cracking. If temporarily testing an overweight motor, additional auxiliary supports (such as hydraulic jacks) must be installed, and stress changes in the test iron floor should be monitored in real time (stress values must not exceed 70% of the material’s allowable stress; for HT250 cast iron, the allowable stress is ≤140 MPa).
Ensure level calibration meets standards: During installation, use an electronic level with an accuracy of 0.01 mm/m to take measurements at six points each in the longitudinal and transverse directions (including the motor fixation area), ensuring levelness errors are ≤0.03 mm/m. If levelness exceeds standards, eccentric vibrations may occur during motor operation, potentially causing localized overloading of the test iron floor. After calibration, use high-strength bolts (M20 or larger) to tighten the support feet in a diagonal sequence, applying torque as specified by the manufacturer (generally 300–500 N·m). Fill any gaps between the support feet and the ground with epoxy resin to prevent loosening over time.
Avoid installation environment risks: The installation site for the test iron floor must be kept away from areas with water accumulation or oil stains to prevent corrosion of the cast iron material. If used in humid environments (e.g., damp-heat test chambers), anti-corrosion mats (e.g., 3 mm thick) should be laid on the surface, and rust preventive oil should be sprayed regularly (once a month). Additionally, the ground’s load-bearing capacity must be ≥1.5 times the total load of the test iron floor to prevent tilting due to ground settlement.
II. Operation Phase: Strictly Control Operating Procedures to Mitigate Test Risks
During motor testing, the test iron floor is subjected to dynamic vibrations, temperature changes, and other conditions. Standardized operations are essential to reduce safety risks:
Vibration protection cannot be overlooked: High-frequency vibrations occur during motor startup, braking, and load testing. Vibration damping pads (hardness 60–70 Shore A, thickness 10–15 mm) must be installed between the motor base and the test iron floor to control vibration amplitude within 0.05 mm, preventing bolt loosening and T-slot wear. When testing high-speed motors (speed ≥3000 rpm), check the connection bolts between the test iron floor and the motor base before testing and retighten them every 2 hours to prevent motor displacement due to bolt loosening.
Be vigilant about temperature effects: Some motor tests (e.g., temperature rise tests) can cause motor surface temperatures to exceed 100°C. High temperatures may transfer to the test iron floor, leading to localized thermal deformation. Install heat insulation pads (e.g., ceramic fiber pads, temperature resistance ≥200°C) between the motor base and the test iron floor, and monitor the surface temperature of the test iron floor in real time (must not exceed 60°C). If temperatures are too high, pause the test and implement forced cooling (e.g., using industrial fans for ventilation) to avoid cracks in the cast iron material due to thermal stress.
The safe use of the test iron floor is the "first line of defense" in motor testing. From load matching and level calibration during installation, to vibration protection and standardized operations during testing, and further to regular inspections and emergency handling during maintenance, every step must be rigorously controlled. Only by strictly adhering to safety precautions can the test iron floor maintain stable precision and structural strength, prevent safety incidents, extend its service life (by 3–5 years), and reduce testing costs. As motor testing technology continues to advance, safety usage specifications must be continuously optimized to meet the testing requirements of new motor types (e.g., new energy vehicle motors), providing a more reliable foundation for motor performance verification.
Qili Machine Tool, Ms. Xie, 13785751790