How to adjust the clearance of the screw lift correctly?

XNUMX. Displacement compensation

Shift compensation is often used for single-term precision error compensation.

1. Compensation for axial movement: First, measure the perpendicularity error of the bearing positioning end face on the main shaft and the center line of the main shaft and its direction position; then measure the end face circular runout error of the thrust bearing and its highest point position, and finally position the bearing. The highest point of the end face is displaced so as to fit together with the lowest point of the circular runout of the end face of the thrust bearing, which can reduce the amount of error of the axial play.

2. Compensation of radial runout: For parts assembled on the shaft, such as gears, worm gears, etc., the radial runout value of the part on the outer circle and the shaft at the assembly of the part should be measured first, and the highest point should be determined respectively. location.During assembly, move and adjust the highest point of the radial runout of the two so that they are in a direction that differs by 180° to offset part of the radial runout error.In order to reduce the radial circular runout value at the front end of the main shaft, the maximum radial circular runout points generated at the front and rear bearings can be located on the same side of the main shaft centerline in the same axial plane, and the error value of the front bearing can be made smaller than that of the rear bearing. error value.

The two meshing tooth surfaces of the worm gear and worm are in line contact, and their bearing capacity is much higher than that of the staggered shaft helical gear mechanism.

The transmission of the screw elevator is equivalent to the screw transmission, which is a multi-tooth meshing transmission, so the transmission is stable and the noise is small.

The screw elevator worm gear box is self-locking.When the lead angle of the worm is less than the equivalent friction angle between the meshing gear teeth, the mechanism has self-locking properties and can achieve reverse self-locking, that is, only the worm can drive the worm, but not the worm.Such as the self-locking worm mechanism used in its heavy machinery, its reverse self-locking can play a role in safety protection.

XNUMX. Error compensation method

Error compensation is an adjustment method in which the error of the part itself is properly assembled to produce a certain degree of mutual cancellation, so as to ensure the accuracy of the equipment movement trajectory.In the maintenance of mechanical equipment, the commonly used error compensation methods include displacement compensation and comprehensive compensation.