Internal expansion type clamp

Abstract

An internal expansion type clamp comprises an oil cylinder and a swing rod mechanism, wherein a reciprocating driving structure which moves along with a piston rod and is used for driving swing rods to rotate is arranged at the top end of the piston rod of the oil cylinder; the piston rod is sleeved with a workpiece positioning disc which is coaxially arranged with the piston rod; at least three positioning claws used for limiting an outer ring of a workpiece are arranged on the workpiece positioning disc; the swing rod mechanism comprises swing rods and a swing rod fixing disc, an even numberof swing rod supporting pieces are arranged on the fixing disc, and the swing rod supporting pieces penetrate through holes in the workpiece positioning disc; at least three swing rods are arranged,and the swing rods are connected with the swing rod supporting pieces in a pivoted mode by means of pin shafts arranged in the middle portions of the swing rods; and the inner ends of the swing rods do reciprocating motion along with the reciprocating driving structure. The internal expansion type clamp has the advantages that the adjustable range of the expansion size is large, the concentricitywith the workpiece is good, the clamping state is good, and the internal expansion type clamp is suitable for workpieces with different outer diameters.

Description

technical field [0001] The invention relates to the technical field of clamps, in particular to an internal expansion clamp with a large adjustable range of expansion size and good concentricity. Background technique [0002] The existing internal expansion fixture generally includes an internal expansion body and an external expansion cone. The outer surface of the cone is closely attached to the inner surface of the workpiece to achieve the purpose of expanding the workpiece. Due to structural design problems, the existing internal expansion fixtures have the following problems. First, due to the limitation of the structure of the internal expansion body, the adjustable range of the expansion size of the external expansion body is very small, generally only adjustable within 1 mm; There is a deviation in the inner degree of the internal expansion body, the external expansion cone and the workpiece, and the deviation is difficult to adjust; the third is that the expansion ...

AI Technical Summary

Problems solved by technology

Due to structural design problems, the existing internal expansion fixtures have the following problems. First, due to the limitation of the structure of the internal expansion body, the adjustable range of the expansion size of the external expansion body is very small, generally only adjustable within 1 mm; There is a deviation in the inner degree of the internal expansion body, the external expansion cone and the workpiece, and the deviation is difficult to adjust; the third is that the expansion and tightening of the workpiece and the internal expansion fixture is through the mutual interaction between the outer surface of the external expansion cone and the inner surface of the workpiece. It is realized by expansion and tightening, its stability is not good, and there is a hidden danger of sliding

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