Mandrel-holding device for tube mills

Abstract

The invention discloses a mandrel-holding device for tube mills, which relates to a tube mill. The invention solves the problem that since the prior holding device cannot effectively limit the waggle of a mandrel, equipment can be damaged. A moving mechanism comprises a slide way, a left slide carriage and a right slide carriage, the slide way is mounted on a base, and is respectively connected with the bottom slide grooves of the left and the right slide carriages, the left slide carriage is connected with the bottom ear ring of a transversely arranged oil cylinder through a pin shaft, and the threaded piston rod of the oil cylinder is connected with the bottom of the right slide carriage through a nut; holding parts are four rollers, two of the holding parts are assembled on the left slide carriage, the other two holding parts are assembled on the right slide carriage, and the rollers are assembled on the carriage in a way that the rollers are transversely staggered from each other and that parts of the longitudinal excircles are superposed; a left rack is mounted on the left slide carriage, a right rack is mounted on the right slide carriage, and the left and the right racks are engaged with a gear fixed on the central line, so that a synchronous centering unit is formed.

Description

technical field [0001] The invention belongs to steel rolling machinery, in particular to a mandrel rod clamping device used in a pipe rolling mill. Background technique [0002] In the current production of seamless steel pipes, a special mechanical device that clamps the mandrel at the inlet side of the pipe mill to stabilize the rolling process is called the mandrel clamping device of the pipe mill. Its position is as follows Figure 5 shown. [0003] The current mandrel clamping device, such as Figure 4 As shown: it is composed of a base 8, an oil cylinder 9, a connecting rod mechanism 10 and two V-shaped clamping blocks 11. When the pipe mill is rolling the steel pipe, the oil cylinder 9 drives the connecting rod mechanism 10 to close up the two V-shaped clamps 11 to form a closed pass, which limits the swing of the mandrel 7 used in the steel pipe. Because the rotation of the mandrel 7 must not be hindered after the two V-shaped clamping blocks 11 are closed, there ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a mandrel clamping device for a pipe rolling mill, and solve the problem that the clamping block of the existing clamping device cannot effectively limit the swing of the mandrel, which will cause damage to the equipment. sabotage problem

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