Tensioner

Abstract

An expanding and tensioning device comprises a support piece (1) and a controlling device, wherein the support piece (1) comprises a plurality of expanding sleeves (11), rubber rings (12) and an expanding sleeve base (13), the expanding sleeves (11) are connected one after another, the rubber rings (12) are arranged among adjacent expanding sleeves (11), and the expanding sleeve base (13) is fixed on the last expanding sleeve (11); the controlling device comprises a tensioning mechanism which comprises a tensioning rod (21) and tensioning power devices (22) acting on the rear end of the tensioning rod (21), the front portion of the tensioning rod (21) is inserted into inner cavities of the expanding sleeves (11), a top cap (23) is fixed at the front end of the tensioning rod (21) to butt against the front expanding sleeve (11), the tensioning power devices (22) apply extruding force on the expanding sleeves (11) via the tensioning rod (21) so as to enable the rubber rings (12) among the adjacent expanding sleeves (11) to be extruded at the same time to deform, and the outer diameters of the rubber rings (12) are increased due to deformation of the rubber rings (12), so that an inner wall of a pipe workpiece can be supported. The expanding and tensioning device has the advantages that the inner wall of the pipe workpiece cannot be damaged, workpiece deformation is small, rotation is achieved during expanding and tensioning, a resistance welding function is achieved, and welding efficiency is improved greatly.

Description

technical field [0001] The invention relates to a positioning device used in industry, in particular to a tensioning device for positioning pipe workpieces, which is suitable for positioning pipe workpieces in welding devices. Background technique [0002] In the prior art, the tensioning device used to position the tubular workpiece usually uses metal parts to support the inner wall of the tubular workpiece to achieve the purpose of positioning, but it is easy to directly contact the metal part and act on the inner wall of the tubular workpiece. Damage to the inner wall of the pipe workpiece may even cause deformation of the pipe workpiece. In addition, the existing tensioning device only has a single tensioning and positioning function and cannot be rotated. When it is applied to a welding device, if it is necessary to weld multiple joints at different angles of the pipe workpiece, it is necessary to make the tensioning device Resetting, readjusting the angle of the pipe ...

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