Traction device

Abstract

The invention discloses a traction device which comprises a first traction wheel and a second traction wheel, wherein the first traction wheel comprises a wheel body, the peripheral wall of the wheelbody is provided with at least one annular bulge, the wheel body and the annular bulge are coaxial, and the length of the annular bulge is less than the length of the wheel body in an axial directionof the wheel body; the second traction wheel is positioned above the first traction wheel, and the axial direction of the second traction wheel is parallel to the axial direction of the first tractionwheel; a first gap for a hose to pass through is formed between the second traction wheel and the first traction wheel, and the first gap is positioned above the at least one annular bulge; and the second traction wheel and the first traction wheel are used for dragging and extruding the hose passing through the first gap. According to the traction device disclosed by the invention, the annular bulge is arranged on the first traction wheel, the extruding degrees of the hose are different when the hose passes through the first gap between the first traction wheel and the second traction wheel,and then, the gas in the hose can be discharged from the place with a less extruding degree, thereby effectively avoiding tube burst caused by the fact that the gas accumulates backward in the hose.

Description

technical field [0001] The invention relates to the technical field of structural design of a flexible pipe production device, in particular to a traction device. Background technique [0002] Expansion is the core process in the production process of heat-shrinkable tubes. Flat tube expansion and printing are the most common expansion methods for heat-shrinkable tubes. In the existing flat tube expansion method, the traction wheel will crush all the tubes to death during the process of pulling the tubes. As the expansion progresses, the gas in the tubes will be continuously compressed and accumulated backwards (opposite to the forward direction of the tubes) , and the heat-shrinkable tube is a continuous tube, its length is generally one thousand meters or nearly ten thousand meters, when the gas flows backward in the tube, a pressure difference will be formed due to the loss along the way, and the internal pressure of the tube will gradually increase, which will further le...

AI Technical Summary

Problems solved by technology

In the existing flat tube expansion method, the traction wheel will crush all the tubes to death during the process of pulling the tubes. As the expansion progresses, the gas in the tubes will be continuously compressed and accumulated backwards (opposite to the forward direction of the tubes) , and the heat-shrinkable tube is a continuous tube, its length is generally one thousand meters or nearly ten thousand meters, when the gas flows backward in the tube, a pressure difference will be formed due to the loss along the way, and the internal pressure of the tube will gradually increase, which will further lead to the loss of the tube. The outer diameter of the pipe is constantly increasing, while the size of the die mouth of the expansion die is fixed, which will reduce the speed at which the pipe enters the expansion die, which will lead to the phenomenon of pipe stacking in the pipe product, which will greatly affect the expansion efficiency of the pipe.

[0003] In addition, in the field of heat-shrinkable tubing, many tubing products are packaged in air-filled trays, and users need to cut the tubing when using it. However, the existing traction wheels will completely crush the product when transporting the tubing product. Cutting is carried out continuously, the gas will continue to accumulate in the pipe, and eventually the pipe will burst when the air pressure in the pipe reaches a certain value, which greatly affects the cutting length of the product and causes great inconvenience to customers.

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