Double-nut ball screw pair preload adjustment and measurement device and linear feed system

Abstract

The invention relates to a double-nut ball screw pair pre-tightening force adjusting and measuring device and a linear feeding system. The double-nut ball screw pair pre-tightening force adjusting and measuring device comprises a main screw nut, a nut sleeve, a locking nut, a pre-tightening nut, a thrust bearing, a front disc spring fixing plate, a first disc spring, a second disc spring, a rear disc spring fixing plate, an annular pressure sensor, a sensor fixing plate, an auxiliary screw nut, an auxiliary nut connecting plate and a worktable connecting plate; one end of the nut sleeve is in fastened connection with the main screw nut; the locking nut and the pre-tightening nut are connected to the nut sleeve by threads; the thrust bearing clings to the pre-tightening nut; the front disc spring fixing plate clings to the thrust bearing; the excircle side of the first disc spring clings to the front disc spring fixing plate; the inner hole of the second disc spring clings to the inner hole of the first disc spring; the rear disc spring fixing plate clings to the excircle side of the second disc spring; and the annular pressure sensor clings to the rear disc spring fixing plate, the sensor fixing plate clings to the annular pressure sensor, and the other side of the sensor fixing plate is in fastened connection with the auxiliary screw nut.

Description

technical field [0001] The invention relates to a device for adjusting and measuring the pretightening force of a double-nut ball screw pair and a linear feed system, belonging to the technical field of mechanical manufacturing. Background technique [0002] As basic manufacturing equipment, CNC machine tools are more and more widely used in the manufacturing industry and play an important role in the development of the country's basic industries. The feed system of CNC machine tools generally relies on two transmission modes: ball screw drive and linear motor drive. At present, CNC machine tools still use mature ball screw pairs as the transmission components of the feed system. [0003] In order to improve the machining accuracy of the parts, the vibration characteristics and feed accuracy of the ball screw pair are currently required to be higher and higher. Generally, the methods used include improving the structural rigidity and assembly accuracy, and using nut pre-tig...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above problems, the existing technology generally adopts a distributed loading and force measuring device placed between two nuts to realize the adjustment and measurement of the preload. However, this method belongs to multi-point force, which will cause preload The uneven distribution of the screw and nut leads to axial vibration during the operation of the screw nut pair, and the increased wear of the parts where the screw and nut are overstressed. Moreover, the processing and assembly accuracy of the parts is very high, and the adjustment of the pretightening force requires Multi-point adjustment is more complicated

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