Three-claw opening-shrinking machine synchronized through connecting rods

Abstract

A three-claw opening-shrinking machine synchronized through connecting rods comprises a supporting seat, a telescopic arm, a first rotating arm, a second rotating arm, a first jaw, a second jaw, a third jaw, a first connecting rod mechanism and a second connecting rod mechanism, wherein the telescopic arm is connected to the supporting seat and can move up and down; the first rotating arm and the second rotating arm are symmetrically positioned on both sides of the telescopic arm respectively; the first rotating arm and the second rotating arm are rotationally connected to the supporting seat through a first pin shaft and a second pin shaft respectively; the first jaw, the second jaw and the third jaw are connected to the first rotating arm, the second rotating arm and the telescopic arm respectively; the first connecting rod mechanism and the second connecting rod mechanism are symmetrically positioned on both sides of the telescopic arm respectively; the top ends of the first connecting rod mechanism and the second connecting rod mechanism are fixed on the first rotating arm and the second rotating arm through the first pin shaft and the second pin shaft respectively, and the lower ends are hinged together; and the lower end of the telescopic arm is connected to the hinged part of the lower ends of the first connecting rod mechanism and the second connecting rod mechanism. Under the action of an acting cylinder and through the first connecting rod mechanism and the second connecting rod mechanism, the first rotating arm and the second rotating arm rotate around the axial lines of the first pin shaft and the second pin shaft, the telescopic arm moves telescopically on the supporting seat, the first jaw, the second jaw and the third jaw are driven by the first rotating arm, the second rotating arm and the telescopic arm to act simultaneously, and the jaws shrink or open.

Description

technical field [0001] The invention relates to a three-jaw necking machine in the field of steel pipe production, in particular to a three-jaw necking machine which can produce seamless steel pipes by adopting a pipe jacking process and which is synchronized through connecting rods. Background technique [0002] At present, there are many methods for the production of hot-rolled seamless steel pipes, such as periodic pipe rolling, automatic pipe rolling, three-roll pipe rolling, two-roll cross rolling, continuous rolling pipe, etc., and the pipe jacking process is also one of them. [0003] The working principle of the pipe jacking process is to push the ejector rod through the transmission rack, so that the capillary pipe after the pre-piercing mandrel has been shrunk passes through multiple roller dies to extend the pipe jacking and roll out the waste pipe, so as to achieve diameter reduction, wall reduction and extension. Purpose. The steel pipe produced by the pipe jac...

AI Technical Summary

Problems solved by technology

[0007] 1. Since there are only two jaws 2' and 3' on the entire circumference of the necking pipe section, the metal covered by each jaw has poor fluidity in the jaws, which affects the uniformity of the shape, wall thickness and strength of the necking cup. sexual influence;

[0008] 2. In addition to the actuator (hydraulic cylinder) required to complete the necking, the position of the necking center also needs to be controlled by a separate actuator (hydraulic cylinder or air cylinder). The control process is relatively cumbersome and increases the steps and time of the process , which also increases the temperature drop of the steel pipe;

[0009] 3. It is difficult for the two jaws 2' and 3' to move centripetally synchronously, and the center position of the necking changes greatly during the necking process

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