A steel pipe lining expansion device

Abstract

The invention relates to the technical field of lining plastic steel tube machining equipment, in particular to a steel tube lining expanding-tightening device. The steel tube lining expanding-tightening device comprises a rack, an expanding-tightening mechanism and a clamping mechanism. The expanding-tightening mechanism comprises an expanding-tightening seat, expanding-tightening blocks, expanding-tightening sleeves and a driving assembly, wherein the expanding-tightening blocks are sleeved with the expanding-tightening sleeves, and the driving assembly drives the expanding-tightening blocks to move. The expanding-tightening seat is fixedly connected to the rack; a hydraulic seat is disposed in the expanding-tightening seat; expanding-tightening pistons and a jacking piston are disposed in the hydraulic seat; the expanding-tightening pistons are connected with the expanding-tightening blocks; the jacking piston is connected with the driving assembly; the driving assembly drives the jacking piston to move in the axis direction of the expanding-tightening seat; and the expanding-tightening pistons are made to drive the expanding-tightening blocks to move in the radial direction of the expanding-tightening seat through hydraulic transmission. The steel tube lining expanding-tightening device is simple in structure and practical; and the expanding-tightening blocks are driven through hydraulic pressure, so that a lining plastic tube is stressed uniformly, the expanding speed is uniform and stable, the expanding effect of the lining plastic tube is good, and moreover, the inner wall surface of the lining plastic tube is not damaged.

Description

technical field [0001] The invention relates to the technical field of plastic-lined steel pipe processing equipment, in particular to a steel pipe lining expansion and tightening device. Background technique [0002] The plastic-lined steel pipe is composed of an outer steel layer and an inner lining layer. The outer steel layer can effectively resist impact and has the mechanical properties of traditional pipes. The inner lining layer is made of non-toxic and anti-corrosion polymer organic materials. The ideal pipeline for water has been widely used at present. The Chinese patent discloses a manufacturing method of a steel-plastic composite pipe, the publication number being CN1073906A. This manufacturing method first rolls out pits and burrs on the inner wall of the steel pipe with a fluffing mechanism, and inserts the inner wall of the steel pipe into the outer wall previously coated with burrs. The plastic liner with adhesive, and then three different methods can be us...

AI Technical Summary

Problems solved by technology

The plastic-lined steel pipe manufactured by the above method has the following defects: due to the inconsistent thermal expansion and contraction of the steel body and the lined plastic pipe, it often causes unstable deformation of the lined plastic pipe, and the outer diameter of the lined plastic pipe will return to the expansion value. The size of the front of the pipe, the plastic lining pipe will float in the steel pipe, which is prone to loosening and leakage, which reduces the reliability of installation and use. Therefore, a steel pipe lining expansion device is needed to expand the plastic lining

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