Precise pneumatic chuck

Abstract

The invention provides a precise pneumatic chuck and belongs to workpiece clamping appliances. An upper plate and a lower plate are fixedly installed on the upper end face and the lower end face of a cylinder body respectively, a wedged-shaped block is fixedly installed on the upper plate, a piston assembly is installed in a center hole of the wedge-shaped block in an inserted mode and located in a closed cavity of the cylinder body, a seal ring is assembled on the outer circle surface of a piston portion of the piston assembly, the piston assembly is sleeved with a laminated spring, the upper end face and the lower end face of the laminated spring are in contact fit with the upper plate and the piston assembly respectively, and an air inlet hole and exhaust holes are formed in the lower plate and the cylinder body respectively; an elastic hinge block is arranged outside the wedge-shaped block in a sleeved mode, an adapter plate is installed at the upper end of the piston assembly through pre-tensioned screws and fixedly connected with the elastic hinge block, an adjusting rotary knob is assembled on the adapter plate, and a limiting screw and a limiting column are installed on the adapter plate in an inserted mode and in threaded connection with the wedge-shaped block. The precise pneumatic chuck is simple in structure, good in operation quality, high in reliability and strong in adaptive capacity.

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: CN201210212982...

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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