Expansion method and expansion equipment thereof of thermal shrinkage pipe material with large caliber

Abstract

The invention relates to an expansion method and expansion equipment thereof of a thermal shrinkage pipe material with large caliber, aiming at overcoming the defects of very low expansion speed and low production efficiency caused by such a way that the existing thermal shrinkage pipe material with large caliber adopts a continuous expansion and continuous pipe shrinkage method during expanding. The invention provides an expansion method of a novel thermal shrinkage pipe material with large caliber and adopts the technical concept that expansion and pipe shrinkage are discontinuously carried out circularly; namely, the pipe shrinkage is not carried out at the time of the expansion and the expansion is not carried out at the time of the pipe shrinkage; pulling force to the pipe material can be greatly reduced at the time of the pipe shrinkage because the expansion is not carried out at the time of the pipe shrinkage, and two problems of cooling moulding and tensile deformation of the pipe material are solved; therefore, the expansion speed and the production efficiency can be enhanced lengthening an expansion mould; and simultaneously, the invention also utilizes the concept to design the corresponding expansion equipment, utilizes a time control switch and an electromagnetic valve to carry out discontinuous air suction and exhaust on the expansion mould, utilizes a stroke measurement control switch to control the pipe shrinkage length and realizes that two procedures of expansion and pipe shrinkage are discontinuously carried out circularly.

Description

Technical field [0001] The invention relates to a heat-shrinkable pipe expansion method and expansion equipment, in particular to a large-caliber heat-shrinkable pipe expansion method and expansion equipment. Background technique [0002] At present, the principle of the heat shrinkable tube expansion machine is as follows: the expansion mold is connected to the vacuum system and the cooling circulation system to keep the cavity of the mold in a vacuum and cooling state. The tube feeder sends the heat shrinkable tube into the oil tank for soaking and heating. Under the action of the tube retracting machine, the heated tube enters the expansion mold from one end, expands and cools the shape in the mold, and then is pulled out from the other end of the mold. Its characteristics are: during the expansion process, the expansion and the tube are received. It has been done simultaneously and continuously. Since the heat shrinkable tube generates pressure on the inner wall of the mold ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of slow expansion speed and low production efficiency of large-diameter heat-shrinkable tubing, the present invention provides an expansion method for large-diameter heat-shrinkable tubing: the two processes of expansion and retraction are carried out intermittently, and the tube is not retracted during expansion. , no expansion when collecting the tube. Since the tube is not expanded when collecting the tube, the pulling force on the tube when collecting the tube can be greatly reduced. Therefore, by lengthening the length of the expansion mold, the expansion speed can be greatly increased and the production efficiency can be improved.

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