Bistable direct drive hardness tester spindle loading and unloading unit

Abstract

The invention discloses a bistable-state direct-driven loading and unloading unit for the main shaft of a hardness tester. The loading and unloading unit comprises a loading and unloading mechanism and a main shaft mechanism, wherein a small piston is arranged at one end of a ball screw in the loading and unloading mechanism, and the ball screw is matched with a nut; a connecting sleeve is arranged between a bearing sleeve and a front sleeve, one end of the connecting sleeve is connected with the bearing sleeve, and the other end of the connecting sleeve and the front sleeve extend into the inner cavity of a bend; a large piston is arranged in the inner cavity of a large oil cylinder body in the main shaft mechanism, and a sensor connecting disc, a sensor and a pressure head are fixedly mounted at the lower end of a large piston rod sleeved with a spring; the front sleeve and the inner cavity of the bend are communicated with the inner cavity of the large oil cylinder body fixedly mounted under the bend through an oil hole in the bend. According to the loading and unloading unit, the main shaft can be loaded and unloaded, the loading and unloading mechanism and the main shaft mechanism are stable gapless devices respectively and are directly connected to form an organic whole body with an accurate position, and the tedious position adjustment operation does not need to be carried out; moreover, the main shaft is large in travel, ingenious in structure, small in size, good in shockproof buffer effects and high in test precision.

Description

technical field [0001] The invention relates to the technical field of hardness tester manufacturing, in particular to a bistable direct-drive hardness tester spindle loading and unloading unit. Background technique [0002] Conventional electronic added hardness tester is mainly composed of three mutually independent mechanisms, which are spindle mechanism, lever mechanism, loading and unloading mechanism. The three mechanisms are respectively installed on the frame of the hardness tester, and through the connection on the frame, each adjusts its own position or posture, so as to realize the mutual correct position of the three mechanisms. in: [0003] (1) The loading and unloading mechanism is mainly composed of a ball screw auxiliary mechanism, a guide and anti-rotation mechanism, a bracket mechanism, a buffer mechanism, a motor and a motor mounting frame mechanism, etc. Its function is to generate power and transmit power to the lever mechanism. In order to ensure tha...

AI Technical Summary

Problems solved by technology

[0004] Its main disadvantages are: complex structure and large volume; the stability and accuracy of loading are poor, which affects the test accuracy of the hardness tester

[0006] Its main disadvantage is: when the spindle stroke is required to be large, the spindle stroke must be increased by increasing the swing angle of the lever mechanism, so that the lever mechanism produces a large radial force on the spindle mechanism

However, the spindle mechanism is a structure with gaps after all, which brings huge restrictions to further obtaining high precision.

[0009] Its main disadvantages are: the spindle mechanism is set independently, there is a gap, the force is unstable, and it is easy to shake; the number of processed parts is large, the process is complicated, and the manufacturing cost is high

Images