Compression molding butt-fusion forming method for large-sized plastic pipe joint

Abstract

The invention discloses a compaction fusion molding method of a large plastic pipe joint which comprises the following steps: straight tubes which are matched with the diameter of a pipeline matching a tube joint is used as the breeches pipe of the tube joint; a variable temperature die of a die cavity which is provided with the shape of the tube joint is prepared, and the front end parts of the breeches pipe are mutually connected; the straight tubes are arranged in the variable temperature die, and the die cavity corresponding to the parts of the straight tubes required to be deformed is heated to lead to the softening and the melting of the front parts of the straight tubes; the tail parts of the straight tubes are pressured to lead to the deformation of the melting parts of the straight tubes to be filled in the die cavity of the die, and the front parts are mutually integrated into one body to become the shape of the tube joint; the variable temperature die is cooled to lead to the cooling and setting of products, and the die is opened. The compaction fusion molding method of the large plastic pipe joint has the advantages of simple equipment, low processing fee, small power consumption and fast molding speed.

Description

technical field [0001] The invention relates to a forming method of large-scale plastic pipe joints, in particular to a manufacturing method of pipe joints with more than bifurcated pipes, such as T-shaped pipe joints, Y-shaped pipe joints, and cross pipe joints. Background technique [0002] In recent years, a large number of water delivery pipes have been changed from cast steel water pipes to PE water pipes, especially large-diameter water delivery pipes in hydropower plants and waterworks. For various reasons, a large number of them have been replaced with large-diameter PE pipes. Therefore, the demand for various types of pipe joints required in the piping process is increasing day by day, and the current manufacturing process still uses the traditional injection molding process. Because the size of the pipe joints is different, the weight ranges from 15 kg to 70 kg, and the shapes are different. At present, in the molding process, most of them adopt the traditional in...

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Problems solved by technology

[0004] (2) The power consumption is very large, 500-800KW;

[0005] (3) The molding efficiency is low, and the molding time of each pipe joint is as long as 20-30 minutes;

[0006] (4) Injection molded products of different sizes are difficult to form on the same injection molding machine;

[0007] (5) The investment cost is extremely high (more than 12 million RMB)

However, the shape of the weld seam between the straight pipes is too complicated, the splicing is difficult, and it is difficult to ensure the splicing quality; the welding-plastic method only melts the plastic at the weld seam, and the degree of fusion between adjacent plastic parts is low, and the weld seam strength is low , the pipe joints made cannot withstand high pressure

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