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How to reduce the clearance of the screw elevator and improve the accuracy

release time:

2022-06-01 16:35

As a basic lifting component, the screw jack is often used for the transmission of the staggered shaft with the staggered angle of 90°. It has many advantages such as compact structure, small size, light weight, convenient installation, high reliability and long service life. It is widely used in machinery, construction, metallurgy, automobile production lines, water conservancy equipment and military industries. The mechanism is mainly composed of deceleration parts and lifting parts, and the worm drive mechanism, as its deceleration part, is the main factor affecting the performance of the screw jack.

The important components in the lead screw elevator are the lead screw and the nut. The lead screw nut drive of the lead screw elevator is one of the most common mechanisms to achieve linear motion. It is difficult to achieve no gap between the lead screw and the nut. Especially after a stage of use, due to wear, the gap between the worm gear (gear) and the lead screw will increase, and the positioning accuracy will decrease, which will affect the normal operation of the equipment.

Therefore, in the process of production and equipment maintenance, the gap between the screw and the nut has become a top priority, and it is very necessary to eliminate the gap between the screw and the nut. In addition to manufacturing, in use, how to reduce the clearance of the screw lift and improve the positioning accuracy? The following Luosheng Electromechanical will introduce to you an effective method.

Compensation for axial play

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 shift the highest point of the bearing positioning end face. The amount of error of axial play can be reduced.

For example, gears, worm gears and other parts should first measure the radial runout value of the parts on the outer circle and the shaft at the assembly of the parts, and determine the position of the highest point respectively. 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 the local radial runout error. When assembling the rolling bearing, the highest point of the radial runout of the journal and the lowest point of the radial circular runout of the inner bore of the rolling bearing can be installed at the same position.

Compensation for radial runout

For the parts assembled on the shaft, in order to reduce the radial runout value of 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 front The error value of the bearing is smaller than the error value of the rear bearing. Its carrying capacity is much higher than that of the staggered-axis helical gear mechanism.

Assembly Error Compensation Method

Error compensation is an adjustment method in which the error of the parts 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.

The displacement compensation of the screw lift is often used for error compensation of single precision, so as to be assembled with the lowest point of the circular runout of the end face of the thrust bearing.

The clearance of the screw lift can also be eliminated by the anti-backlash device, which requires non-standard design. If you have high requirements for the use of the screw lift, you can consult with Luosheng Electromechanical for the specific details of the anti-backlash lift.