Hydraulic control system of steel tube clamping device in hydraulic pressure test tube machine

Abstract

A hydraulic control system of a steel tube clamping device in a hydraulic pressure test tube machine relates to the hydraulic control systems of rolling machinery. The system comprises an upper clamping hydraulic cylinder internally provided with a displacement sensor, an upper clamp arranged at the head of a piston rod, a lower clamping hydraulic cylinder internally provided with a displacement sensor and a lower clamp arranged at the head of the piston rod; a pressure sensor, an electromagnetic relief valve, a one-way valve, a reducing valve, a No.I hydraulic control one-way valve, a No.I proportional reversing valve, an electromagnetic reversing valve and a hydraulic oil tube form a hydraulic control circuit of the upper clamping hydraulic cylinder; a relief valve, a No.II hydraulic control one-way valve, a No.II proportional reversing valve, an electromagnetic reversing valve and a hydraulic oil tube form a hydraulic control circuit of the lower clamping hydraulic cylinder. The system effectively controls the stroke and the maximum clamping force of the hydraulic cylinder, accelerates the production rhythm, ensures the accuracy of the clamping device location and plays a role of safety protection of the pressure test steel tubes in the process of pressure test.

Description

technical field [0001] The invention belongs to a hydraulic control system of a steel rolling machine, and in particular relates to the hydraulic control of a clamping device in a large-diameter straight seam submerged arc welded steel pipe hydraulic test tube machine. Background technique [0002] During the pressure test of the hydraulic test tube machine, the lifting device lifts the steel pipe to be tested to the position of the center line of the pressure test, and the steel pipe is pressed tightly by the front and rear pressure heads with seals. At this time, the clamping device located in the middle of the steel pipe needs to clamp the steel pipe, that is, the piston rod of the upper clamping hydraulic cylinder protrudes downwards, and the piston rod of the lower clamping hydraulic cylinder protrudes upwards. Type clamps clamp the steel pipe. After the steel pipe is clamped, the lifting device descends and resets. The steel pipe starts to be filled with low-pressure...

AI Technical Summary

Problems solved by technology

[0011] The control principle of the prior art only has the function of rigid clamping, and the stroke of the clamping hydraulic cylinder is as long as 820mm. It can only run the full stroke each time, and there is no pause function in the middle of the stroke, which brings inconvenience to equipment debugging and affects the production rhythm; when the steel pipe is deformed, the V-shaped clamp of the hydraulic cylinder cannot retreat and has no pressure protection function; when the steel pipe is deformed, it will cause clamping The increase of oil pressure in the clamping hydraulic cylinder causes the connecting oil pipe of the hydraulic cylinder to rupture; during the clamping process, the electromagnets of No. , the clamping device will loosen the pressure test steel pipe, which may cause accidents

Therefore, users often leave this clamping device idle, and lose the safety protection function during the steel pipe pressure test process.

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