Variable-diameter thin-wall plastic inner container vacuum adsorption clamp

Abstract

The invention provides a variable-diameter thin-wall plastic inner container vacuum adsorption clamp. The requirements for clamping position precision and roundness during secondary machining of a thin-wall plastic inner container are considered, and the clamping precision is improved while the roundness of the inner container is guaranteed. The vacuum adsorption clamp is mainly characterized in that three vacuum adsorption V-shaped blocks which are evenly arranged on the circumference are installed on three synchronous hydraulic cylinders, and small adsorption discs are evenly arranged on the three vacuum adsorption V-shaped blocks. For thin-wall plastic inner containers with different diameters, when the synchronous hydraulic cylinders move and the vacuum adsorption V-shaped blocks are clamped, the two groups of small adsorption discs on each vacuum adsorption V-shaped block are always tightly attached to the outer wall of the inner container; and meanwhile, the other small adsorption discs which are not attached are closed. The small adsorption discs share one vacuum pipeline, after vacuumizing of a vacuum pump, adsorption force is evenly distributed on each small disc, and due to the fact that the vacuum adsorption V-shaped blocks are evenly distributed in the circumferential direction, the adsorption force of the discs is offset, and clamping deformation caused by uneven clamping force to the inner container is avoided.

Description

technical field [0001] The invention relates to the field of production and processing of large aspect ratio and large-capacity thin-walled plastic liner, in particular to a vacuum adsorption fixture for variable-diameter thin-walled plastic liner. [0002] technical background [0003] Thin-walled cylindrical parts refer to the diameter to wall thickness ratio SDR of 50 or even greater. The deformation of plastic thin-walled cylindrical workpieces has always been a technological problem in machining. Typical plastic thin-walled liner parts, such as large-capacity IV-type hydrogen storage bottles, generally have an inner diameter greater than 500mm, the design thickness of the liner wall thickness is less than 8mm, and the SDR is as high as 62.5, and the liner welding has high geometrical tolerance requirements, which cannot be affected. Inner bile fibers are entangled. The main factor affecting the clamping accuracy of the large-capacity thin-walled plastic liner is the fo...

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Problems solved by technology

[0006] The invention takes the thin-walled plastic liner as the object, and designs a vacuum adsorption fixture for the thin-walled plastic liner with variable diameter, which solves the problem of clamping deformation of the thin-walled plastic liner caused by uneven clamping force, compared with the original thin-walled plastic liner. The wall pipe fixture structure is intended to achieve the requirements of simple mechanism, automatic centering, variable diameter clamping, and uniform distribution of clamping force, so as to improve the roundness and coaxiality of thin-walled plastic liner clamping. Subsequent processing provides a reliable guarantee

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