Single dual-expansion-oil-cylinder-driven clamp of drawing machine

Abstract

The invention discloses a single dual-expansion-oil-cylinder-driven clamp of a drawing machine. The clamp comprises a pipe-clamping trolley, a clamping jaw, a core, an oil cylinder fixed seat, a taper-hole disc and a workpiece. The clamp is characterized by further comprising a dual-expansion hydraulic oil cylinder, a radial adjustable connecting disc, a three-position two-way reversing valve and a three-position four-way reversing valve, wherein the dual-expansion hydraulic oil cylinder comprises an outer cylinder, a middle cylinder and a piston rod; the radial adjustable connecting disc is mounted on a coat of the middle cylinder and is connected with the clamping jaw, and the clamping jaw stretches into the taper-hole disc of the pipe-clamping trolley and clamps the outer wall of the workpiece; the piston rod is connected with the core, and the core enters an inner cavity of the workpiece; the three-position two-way reversing valve is connected with piston rod cavities of the outer cylinder and the middle cylinder, respectively; one end of the three-position four-way reversing valve is connected with a liquid inlet of the outer cylinder, and the other end of the three-position four-way reversing valve is connected with the three-position two-way reversing valve. The clamp has the advantages that the structure is compact, the size is small, a system is simple, a synchronous problem is avoided when the clamping jaw is placed, the placing and taking processes of the clamping jaw are absolutely synchronized, and a centering effect to the workpiece is good.

Description

technical field [0001] The invention relates to a drawing machine component, more specifically to a drawing machine fixture driven by double telescopic oil cylinders. Background technique [0002] When drawing a steel pipe, the drawing machine must first clamp the end of the workpiece. Generally, the workpiece is fixed with non-slip multi-piece jaws. In order to prevent the deformation of the end, a core is inserted in the inner hole of the workpiece. Generally, the hydraulic cylinder drives the jaws into place. and pull out, but the core is placed manually, and the core is manually taken out after the workpiece is drawn. It is very time-consuming and laborious to put and take the core in this way. In many cases, repeated hammering is required, especially for large-diameter steel pipes. The core is very heavy and difficult to move. It is very difficult to move up and down and so on. The drawing machine manufactured by a German drawing machine factory uses a jack in the midd...

AI Technical Summary

Problems solved by technology

Moreover, the use of three jacks at the same time takes up a lot of space, so that the chuck trolley of the cold drawing machine is made very large

Images