Vertical steel pipe self-centering straightening equipment

Abstract

The invention discloses vertical steel pipe self-centering straightening equipment. The vertical steel pipe self-centering straightening equipment comprises a machine frame, a machine seat, an oil cylinder and straightening rollers; the machine frame is fixed to the machine seat; a three-claw clamping disc is welded and fixed to a welding block which is positioned on the machine seat; the oil cylinder is vertically downward and is fixedly mounted on a sliding seat; the sliding seat is arranged on a transverse guide rail which is positioned on the machine frame in a sliding manner; the straightening rollers are mounted on a connecting shaft; the connecting shaft is welded and fixed to a piston rod of the oil cylinder; at least four straightening rollers are uniformly arranged in the circumferential direction of the connecting shaft; the maximum distance between opposite two straightening rollers is equal to the inside diameter of a steel pipe. According to the vertical steel pipe self-centering straightening equipment, the friction between each straightening roller and the inner wall of the steel pipe is small, and the outer wall of the steel pipe cannot be worn, so that the surface quality of the outer wall of the steel pipe cannot be influenced; during a straightening process, the steel pipe is fixed; the problem of twisting or rotating is avoided; therefore, other negative effects cannot be produced.

Description

technical field [0001] The invention relates to steel pipe processing and production equipment, in particular to a vertical self-centering straightening equipment for steel pipes. Background technique [0002] The production process of cold-drawn seamless steel pipes is as follows: inspection and heating of tube blanks, drilling and fixing holes, head capillary, cold drawing, heat treatment, straightening, head and tail cutting, inspection, flaw detection, and storage after damage protection. But the treated pipe will have a series of defects, the main ones are the longitudinal bending and the ellipticity of the cross section. In order to eliminate these defects, it is necessary to set up a straightening machine. [0003] Roller straightening machine is a commonly used equipment for straightening steel pipes. It uses straightening rollers to squeeze bars, etc. to change the straightness. Generally, there are two rows of straightening rollers, the number of which varies. Th...

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Problems solved by technology

Roller straightening machines often have such problems: 1. During the straightening process, the local tensile and compressive stress of the steel pipe is too large, causing the steel pipe to rotate on the roller surface, which may produce a spiral curvature. Aligning the steel pipe to the center of the pressure roller by manual operation often leads to misalignment due to assembly and wear problems, which affects the straightening effect; 3. The friction between the steel pipe wall and the pressure roller is serious, which is not conducive to maintaining the good surface quality of the steel pipe

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