The noise of the big bottom thread machine refers to the abnormal friction, impact and looseness of the big bottom thread machine when it is running at high speed.

The abnormal noise problem of the big bottom line machine, we can distinguish where the shoe-making equipment problem is based on the sound source, and we can deal with the original problem behind the noise problem in a targeted manner for different locations or reasons.

1. The gear quality is not good. Add a small amount of abrasive paste on the two pairs of meshing tooth surfaces, and then turn the upper wheel forward and backward by hand, about 10 to 15 minutes. We can clean the dirt with kerosene, add a little smooth oil, and then adjust the gap as required.

2. The sound caused by the axial looseness of the upper shaft, vertical shaft and lower shaft. We first loosen the two fastening screws of the gear, and then readjust the axial clearance of the vertical shaft and the upper and lower shafts.

3. The tooth surface of the bevel gear meshes up and down, resulting in noise when the gear is running at high speed. We can loosen the fastening screws of the bevel gears with different tooth surfaces. After loosening the fastening screws of the shaft sleeve that are in contact with the bevel gear shaft, knock the upper and lower positions of the tooth surface meshing with a knocking rod, and then tighten the fastening screws of the bevel gear and the shaft sleeve respectively.

4. The meshing gap of the tooth surface of the bevel gear is too large or too small, resulting in acoustic problems. We can correct the bevel gear tooth surface meshing gap by knocking on the sleeve. The meshing gap of a pair of gears is between 0.20mm~0.40mm.

5. The gap between the rotary hook and the positioning hook is too large. We must adjust the gap between the rotary hook and the positioning hook within the range of 0.45mm~0.65mm.