Combined type double nut ball screw pair with adjustable pre-tightening force and installation method

Abstract

The invention discloses a combined type double nut ball screw pair with adjustable pre-tightening force and an installation method. The combined type double nut ball screw pair is composed of a lead screw, a left nut, a left flat key, a left pre-tightening connecting disc, a force sensor, an annular giant magnetostrictive actuator, a right pre-tightening connecting disc, a right flat key and a right nut; the lead screw penetrates through the annular giant magnetostrictive actuator, and the left nut matched with the lead screw is installed on one side of the annular giant magnetostrictive actuator, and the right nut matched with the lead screw is installed on the other side of the annular giant magnetostrictive actuator; the left nut is connected with the left pre-tightening connecting disc through the left flat key, the left pre-tightening connecting disc is installed on the annular giant magnetostrictive actuator, and the force sensor is installed between the annular giant magnetostrictive actuator and the left nut; and the right nut is connected with the right pre-tightening connecting disc through the right flat key, and right pre-tightening connecting disc is installed on the annular giant magnetostrictive actuator.

Description

technical field [0001] The invention relates to a combined double-nut ball screw pair whose pretightening force can be manually and automatically adjusted, belongs to the field of functional parts of numerical control machine tools, and relates to a double-nut ball screw pair of rolling function parts. Background technique [0002] The strength of the equipment manufacturing industry directly reflects the development level of a country's national economy and national defense construction, while CNC machine tools are the basis for the development of equipment manufacturing industries. Functional components are one of the three major components of CNC machine tools, and their performance affects the overall performance of the machine tool. and precision are important factors. As an important functional part, the ball screw pair has the advantages of low friction, high transmission efficiency, high transmission accuracy and high rigidity, and is widely used in the feed system o...

AI Technical Summary

Problems solved by technology

However, the pre-tightening force of the screw pair is generally preset by the manufacturer, and cannot be adjusted automatically during the processing. Long-term work and wear will cause changes in the pre-tightening force, thereby reducing the transmission accuracy.

The adjustment and maintenance of the preload need to be done manually, which will consume a lot of manpower and material resources

[0006] Chinese patent document CN203656087U discloses "Double Nut Ball Screw Pair with Precisely Adjustable Pretightening Force" and CN105965307A discloses "Double Nut Ball Screw Pair Preload Adjustment Pre-measurement Device and Linear Feed System" which can automatically detect preload The change of force realizes the precise adjustment of the preload of the ball screw pair, but it cannot realize automatic real-time adjustment

[0007] CN106017915A discloses "A Precisely Preloaded and Loaded Ball Screw Pair Accuracy Retention Test Device", which uses a pressure sensor to detect the preload between two nuts, and precisely controls the screw through the expansion and contraction of the piezoelectric ceramic actuator. The size of the pretightening force of the bar nut realizes the automatic compensation of the pretightening force, but the strain and force output by the piezoelectric ceramic actuator are relatively small, and its operating voltage is high

[0008] CN1045253A disclosed "A Double Nut Ball Screw Pair Automatic Preloading Device" adopts a force sensor and a giant magnetostrictive cylinder to realize the automatic regulation of the double nut ball screw p It is difficult to apply a uniform initial pre-tightening force to the bolts, the aerodynamic heat dissipation effect is not good, and the ball screw pair does not consider the installation between the actual workbench

Images