Precision hydraulic grab-clamping mechanism based on tracking and pre-tightening

Abstract

The invention discloses a precision hydraulic grab-clamping mechanism based on tracking and pre-tightening and belongs to a working clamp device. An upper plate and a lower plate are fixedly arranged on the upper end face and the lower end face of a barrel body respectively; a wedge block is fixedly arranged on the upper plate; a piston assembly is inserted into a central hole of the wedge block and is positioned in a closed cavity of the barrel body; sealing rings are arranged on the surface of the external circle of a piston part of the piston assembly; the piston assembly is sleeved with laminated springs, and the upper end faces and the lower end faces of the laminated springs are in contact with the upper plate and the piston assembly respectively; exhaust holes are formed in the barrel body; a lower cavity of the barrel body is fixedly connected with an oil tank through a pipeline; a hydraulic pump is connected to the pipeline; an elastic hinge block is sleeved upon the outer part of the wedge block; a switching plate is mounted at the upper end part of the piston assembly through a pre-tightening screw and is fixedly connected with the elastic hinge block; adjustment knobs are assembled on the switching plate; a limiting screw and a limiting column are inserted into the switching plate and are in threaded connection with the wedge block. The precision hydraulic grab-clamping mechanism is simple in structure, high in working quality, high in reliability and high in adaptability.

Description

technical field [0001] The invention belongs to a clamping device, and mainly relates to a precision annular workpiece clamping device in the field of equipment manufacturing. Background technique [0002] In the fields of ultra-precision metrology testing and ultra-precision machining, high-speed, stable, and precisely positioned clamping devices are the basic guarantee for precision measurement and aero-engine assembly. At present, with the advancement of material science and the improvement of the accuracy level of ultra-precision measuring instruments and ultra-precision machining and manufacturing equipment, the design and application of high-precision ring workpieces are becoming more and more widely used, and the tools in the processing process have become the guarantee of processing accuracy. Base. [0003] Hefei University of Technology proposed a swing rod type axial fastening chuck (a swing rod type axial fastening chuck. Patent publication number: CN 20121021298...

AI Technical Summary

Problems solved by technology

[0005] Patent No. US4840387 proposes a clamping device in which the split nut and the chuck cooperate with each other to lock each other. This structure is characterized by high reliability and can easily adjust the tightening degree of the chuck manually. Clamping needs to increase the proportion of the device accordingly, resulting in increased friction for adjustment, which is not conducive to assembly and clamping

[0006] Generally speaking, the traditional three-jaw chuck and multi-jaw chuck clamping mechanism may cause irreparable damage to the workpiece surface during the assembly process due to its natural defects of uneven force on the workpiece.

Moreover, more and more large and ultra-large ring-shaped workpieces are constantly appearing. The volume of the traditional three-jaw chuck and multi-jaw chuck clamping mechanism should increase correspondingly with the increase of the outer diameter of the ring. In terms of economic cost It is less and less advantageous, and at the same time, it limits the design of large-scale ring workpieces by designers

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