How to detect quality problems of NMRV110-50-2.2KW reducer

NMRV110-50-2.2KW is a worm gear reducer. Quality inspection requires five core steps: static appearance structure inspection, assembly accuracy measurement, no-load operation testing, load operation verification, and sealing lubrication system verification. Combined with the characteristics of worm gear transmission, quality defects are determined. The specific inspection method is as follows:

1、 Static appearance and structural quality inspection

1. Appearance and component integrity inspection: Check the surface of castings such as the machine base and end caps for sand holes, air holes, cracks, and deformation defects. The paint layer should be evenly and firmly applied without peeling or sagging; The nameplate identification is clear and includes information such as model, transmission ratio, power, speed, and date of manufacture, which is consistent with the procurement requirements. Check that the fasteners are complete and not missing, the bolts are tightened without looseness, and the threads are free of slipping or rusting; Confirm that the worm gear is made of 45 # steel quenched or 20CrMnTi carburizing quenched, and the worm gear is made of tin bronze material. If the material does not meet the standard, it will be judged as a quality defect.

2. Assembly accuracy testing: Use a dial gauge to check the radial runout of the input shaft and output shaft. The radial runout of the input shaft is ≤ 0.05mm, and the radial runout of the output shaft is ≤ 0.08mm. Exceeding the tolerance indicates that the shaft assembly is eccentric or the bearing accuracy is insufficient. Measure the side clearance of the worm gear and worm gear with a feeler gauge. The normal side clearance is 0.15-0.25mm. If the side clearance is too small, it is easy to get stuck and the temperature rise is too high. If the side clearance is too large, the transmission accuracy is low and the noise is high. Use a feeler gauge to check the joint surface of the machine base. The gap should be ≤ 0.03mm and there should be no leakage marks. If the gap is too large, it indicates that the machine base is deformed or the bolts are not tightened according to the principle of symmetrical cross during assembly.

2、 Quality inspection of no-load operation

1. No load start and operation status: Connect the 2.2KW matching motor, confirm that the direction of rotation is consistent with the markings, jog the start without any jamming or abnormal noise, run continuously without load for 30 minutes, and run smoothly without shaking. Measure the temperature of the machine base, bearing end cover, and worm shaft extension with an infrared thermometer. When the ambient temperature is ≤ 40 ℃, the temperature rise of the machine base is ≤ 35K, the temperature rise of the bearing end cover is ≤ 45K, and there is no local overheating; If the temperature rises too quickly or the local temperature exceeds 70 ℃, it is determined that the bearing assembly is too tight, the meshing is poor, or the lubrication is improper.

2. Noise and vibration detection: Measure the no-load noise with a noise meter at a distance of 1m from the reducer, with a value ≤ 65dB (A), and no sharp metal friction or impact sound; There is no obvious abnormal vibration when touching the machine base with hands, and the effective value of vibration speed is ≤ 2.0mm/s. Abnormal noise and vibration are mostly caused by low machining accuracy of the tooth surface, damaged bearings, or unbalanced shaft system.

3. Sealing performance testing: During no-load operation, observe the input shaft, output shaft oil seal, machine base joint surface, oil plug, breathable plug and other parts, and ensure that there is no oil leakage or oil stains; The judgment of oil seal spillage is that the oil seal is installed in the opposite direction, the model is not matched, or the roughness of the shaft neck exceeds the standard.