Three-component mixing head for injection molding

Abstract

The invention discloses a three-component mixing head for injection molding. The mixing head comprises a pressure regulating core block and a small piston. The pressure regulating core block comprises a small piston push rod installing hole, a color paste feeding hole, a color paste discharging hole, an ISO feeding hole, an ISO discharging hole, a POL feeding hole, a POL discharging hole, a horizontal mixing and injecting zone and a mixture discharging. An included angle is formed between the color paste feeding hole and the horizontal mixing and injecting zone. The push rod of the small piston is provided with a first high pressure circulating groove, a second high pressure circulating groove and a color paste circulating groove, wherein the first high pressure circulating groove and the second high pressure circulating groove are symmetrically arranged, and the color paste circulating groove is located on the symmetrical center line of the first high pressure circulating groove and the second high pressure circulating groove. The push rod of the small piston is slidably mounted in the small piston push rod installing hole in the pressure regulating core block through clearance fit and can carry out linear reciprocating motion along the small piston push rod installing hole. The three-component mixing head has the following advantages: sufficient bumping of three components is realized, a good mixing effect is obtained; ISO and POL do not flow backward relative to the center hole of the small piston during pouring, the color paste injection center hole of the small piston does not have obstruction fault, production efficiency is improved, processing time and maintenance time are saved, and cost for spare parts is reduced.

Description

technical field [0001] The invention belongs to the technical field of foam molding tooling, and relates to a three-component mixing head for injection molding; it is especially suitable for the foam molding manufacture of steering wheels. Background technique [0002] Foam molding focuses on avoiding defects such as underfullness, pores, and dark pits. It has always been a technical topic for engineers and technicians to explore and research in this field; in the past, engineers and technicians researched and explored more on the material (chemical raw material) formula and technical parameters. . [0003] The mixing heads manufactured by foam molding include two-component mixing heads, three-component mixing heads, four-component mixing heads, six-component mixing heads, etc. Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 As shown, the existing three-component mixing head includes a pressure regulating core block and a small piston; the ...

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Problems solved by technology

[0004] The invention discloses a three-component mixing head for injection molding to solve the problem that in the prior art, the color paste flows out through the corner of the center hole of the small piston color paste injection, and the color paste, ISO, and POL cannot fully collide; the mixing effect is not good, The foaming is not full, easy to produce air holes and dark pits, and the product rejection rate is high; when pouring, it is easy to produce ISO and POL reverse pouring in the center hole of the relatively small piston, and the center hole of the small piston color paste injection is blocked, and the equipment failure rate is high; small piston processing and manufacturing The process is complex, and problems such as stress concentration are prone to occur during quenching

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