A spatial multi-point rapid filling system for the production of large plastic products

Abstract

The invention discloses a spatial multipoint type rapid filling system for production of large-scale plastic products. The spatial multipoint type rapid filling system comprises a secondary main conveying barrel, a starting shunt, a primary conveying barrel, a plurality of branch conveying barrels, spray nozzles, a shunt shuttle and a tail-end shunt; a plurality of through holes intersected inside are arranged in the surface of each of the starting shunt and the tail-end shunt, the primary main conveying barrel is communicated with one through hole in each of the starting shunt and the tail-end shunt, the rest through holes in the starting shunt are respectively and fixedly connected with the secondary main conveying barrel and the branch conveying barrel, and the rest through holes of the tail-end shunt are respectively and fixedly connected with the shunt shuttle and the branch conveying barrels. By the arrangement of the spatial multilayer and multipoint type rapid-filling injection system, filling area of single injection points can be effectively lessened, flow length ratio of product injection can be multiplied to reduce, injection efficiency of an injection molding machine can be fully utilized, rapid injection filling is realized, production efficiency of the products is increased, and stress distribution of molds and products during injection can be further improved.

Description

technical field [0001] The invention relates to the field of injection molding, in particular to a space multi-point rapid filling system for the production of large plastic products. Background technique [0002] Due to the advantages of low cost, strong corrosion resistance, good plasticity, and recyclability, plastic products are widely welcomed by people. In recent years, with the continuous development of polymer technology and the continuous innovation and breakthrough of plastic processing technology, related Plastic products have penetrated into various industries and are widely used in various fields of the national economy. [0003] Plastic injection molding technology can form plastic products with complex shape, dense structure, precise size and smooth surface at one time; and the molding mold can be quickly replaced, which can quickly adapt to the changing needs of the market; at the same time, the production efficiency, automation and intelligence are high. It...

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Problems solved by technology

[0005] 1. Product molding quality is easily affected by the characteristics of raw materials such as fluidity and shrinkage rate. Thin-walled products are difficult to form or even impossible to form; the size of plastic parts with medium and large wall thickness is difficult to control; at the same time, the structural design of plastic products requires high requirements , products with uneven wall thickness have poor molding quality

[0006] 2. Large-scale plastic products are bulky and heavy. When molding, they need to fill the mold cavity quickly, and then use higher pressure to maintain the pressure to ensure product quality and dimensional accuracy. However, conventional injection molding technology is limited by machine nozzles and molds. The structural form and size of the gating system are limited. During the injection molding process, when the molten material passes through the nozzle of the injection machine and the gating system of the mold, the pressure loss is serious, and it cannot be filled quickly. Sometimes the cavity is not filled yet, but the front end The molten material has begun to cool and solidify; at the same time, the injection pressure generated by the injection machine cannot be effectively transmitted to the inside of the mold cavity for reasonable and effective pressure maintenance, so that the internal structure, appearance quality, and dimensional accuracy of the product are difficult to meet the requirements

It is impossible to fully use the parameter configuration of the injection machine and it is difficult to guarantee the quality indicators of plastic products

[0007] 3. When producing large-scale plastic products, especially large-scale deep-cavity and thin-wall plastic products, due to the narrow internal space of the mold cavity and the large injection flow ratio, most of the injection pressure generated by the injection machine is consumed in the molten material. In the process of flow filling, in order to ensure the completion of filling and product molding quality, the injection pressure and clamping force must be increased. The requirements for the configuration of the injection system and the clamping mechanism of the injection machine are relatively high. The waste will also increase the energy consumption during product processing and production

Not only that, because the injection flow ratio is too large, the injection pressure cannot be effectively transmitted in the cavity, the pressure at the front end of the melt decays rapidly, and the internal pressure of the melt near the gate is much greater than that far away from the gate. After the product is cooled and shaped, warping, deformation or even cracking will easily occur due to the uneven distribution of internal stress, which will affect the product molding quality and pass rate, and increase the consumption of raw materials

[0008] 4. Large-scale plastic products are large in size and weight, and the injection, pressure holding, and cooling cycles are long. It is necessary to shorten the cycle of each process link to achieve the purpose of improving production efficiency and reducing production costs. Due to the limitations of the nozzle, mold pouring system and the internal space of the mold cavity, it is difficult to make full use of the injection rate, injection pressure and other related technical parameters of the injection machine, and it is impossible to maximize the use potential of the injection machine

[0009] The above-mentioned weaknesses and limitations of injection molding technology have greatly restricted the further development and wider application of injection molding technology

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