Injection molding machine gun barrel for processing foamed plastic products

Abstract

The utility model discloses an injection molding machine gun barrel for processing foamed plastic products, and relates to the technical field of injection molding machines, in particular to an injection molding machine gun barrel for processing foamed plastic products. Comprising a screw tube, a screw rod arranged in the screw tube and a material injection nozzle arranged at the tail end of the screw tube, and a material inlet is formed in the front end of the screw tube; a one-way gas check valve is arranged in the middle section of the screw tube, an air inlet hole penetrating through the tube wall of the screw tube is formed in the outer edge of the rear section, far away from the gas check valve, of the screw tube, and a one-way injection non-return ring is arranged at the rear end of the screw tube. According to the utility model, chemical assistants are not added in the process of processing foamed plastic products, and are changed into supercritical nitrogen or carbon dioxide gas for processing and foaming, so that the problem of environmental pollution is fundamentally solved, and the processed products are finer, uniform in foaming and superior in quality through the improvement of the gun barrel matched with the device.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding machine technical field, especially point to a kind of injection molding machine barrel for processing foamed plastic product. BACKGROUND

[0002] Foamed plastic products are widely used in various industries due to their lightweight, heat insulation, sound insulation, easy processing, durability, and mass production capabilities. Foaming technology can improve product size accuracy, shorten product development cycle, eliminate surface shrinkage, improve production efficiency, and save raw materials and manufacturing costs.

[0003] Foamed plastic products are generally made by placing plastic particles and chemical additives into the injection molding machine barrel through the inlet 11 of the screw pipe 1 (see attached Figure 1 ), high temperature in the screw pipe 1 and the screw rod 2 in the screw pipe 1 generate chemical reaction, generate bubbles, and the foamed plastic body is extruded into the cavity of the molding mold on the injection molding machine through the material injection nozzle 6 at the end of the injection molding machine barrel. After cooling, the mold is opened for processing. Due to the need to add chemical additives during foaming, high temperature and high pressure cause the chemical additives to volatilize, which is harmful to the environment and operators. SUMMARY

[0004] The utility model aims at overcoming the defects of prior art, and provides an injection molding machine barrel for processing foamed plastic products.

[0005] The utility model adopts the following technical scheme:

[0006] An injection molding machine barrel for processing foamed plastic products, comprising a screw pipe, a screw rod arranged in the screw pipe, and a material injection nozzle at the end of the screw pipe. An inlet is provided at the front end of the screw pipe. A one-way gas check valve is provided in the middle section of the screw pipe. An air inlet hole penetrating the screw pipe wall is provided on the outer edge of the rear section of the screw pipe away from the gas check valve. A one-way material injection check ring is provided at the rear end of the screw pipe.

[0007] The end of the screw pipe is fixedly connected to an empty pressure stabilizing storage tank. The other end of the pressure stabilizing storage tank is connected to the material injection nozzle.

[0008] The air inlet hole penetrating the screw pipe wall is uniformly distributed and preferably has three.

[0009] The screw thread between the gas check valve and the material injection check ring is different from the screw thread between the gas check valve and the inlet of the screw pipe. The inclination angle of the former is greater than that of the latter, and the screw thread gradually changes from long to short.

[0010] The gas check valve and the material injection check ring are both one-way valves.

[0011] The gas input through the gas inlet hole penetrating the screw pipe wall is supercritical nitrogen gas / carbon dioxide gas.

[0012] The utility model discloses a kind of injection molding machine barrels for processing foamed plastic products, including screw pipe 1, screw rod 2 being arranged in screw pipe 1 and material injection nozzle 6 at the end of screw pipe 1, inlet 11 is provided at the front end of screw pipe 1;The middle section of the screw pipe 1 is provided with one-way gas check valve 3, on the outer edge of the rear section of screw pipe 1 away from gas check valve 3, gas inlet hole 12 penetrating the pipe wall of screw pipe 1 is provided, the rear end of screw pipe 1 is provided with one-way material injection check ring 4; BRIEF DESCRIPTION OF DRAWINGS

[0013] C Figure 1 It is prior art sectional view;

[0014] C Figure 2 It is sectional view of the utility model. DETAILED DESCRIPTION

[0015] See attached Figure 2 A kind of injection molding machine barrel for processing foamed plastic products, including screw pipe 1, screw rod 2 being arranged in screw pipe 1 and material injection nozzle 6 at the end of screw pipe 1, inlet 11 is provided at the front end of screw pipe 1;The middle section of the screw pipe 1 is provided with one-way gas check valve 3, on the outer edge of the rear section of screw pipe 1 away from gas check valve 3, gas inlet hole 12 penetrating the pipe wall of screw pipe 1 is provided, the rear end of screw pipe 1 is provided with one-way material injection check ring 4;

[0016] The end of the screw pipe 1 is fixedly connected with the empty pressure stabilizing storage tank 5, and the other end of the pressure stabilizing storage tank 5 is connected with the material injection nozzle 6;

[0017] The gas inlet hole 12 penetrating the pipe wall of the screw pipe 1 is uniformly distributed and preferably has three;

[0018] The thread of the screw rod 2 between the gas check valve 3 and the material injection check ring 4 is different from the thread between the gas check valve 3 and the inlet 11 of the screw pipe 1, the inclination angle of the former thread is greater than that of the latter thread, and the thread of the former gradually changes from long to short;

[0019] The gas check valve 3 and the material injection check ring are both one-way valves.

[0020] The gas input through the gas inlet hole 12 penetrating the pipe wall of the screw pipe 1 is supercritical nitrogen gas / carbon dioxide gas.

[0021] When the utility model is applied, the plastic particles are put into the injection molding machine barrel for heat processing through the inlet 11 of the screw pipe 1, the high temperature in the screw pipe 1 and the screw rod 2 stirring and advancing in the screw pipe 1, the plastic body in molten state enters into the screw pipe 1 between the gas check valve 3 and the injection check ring 4 through the gas check valve 3 in the middle section of the screw pipe 1; at the same time, the gas input from the gas inlet hole 12 penetrating the pipe wall of the screw pipe 1 is supercritical nitrogen gas or carbon dioxide gas, because the gas check valve 3 and the injection check ring 4 are both one-way valves in the same direction, the plastic body pushed into the interval is cut into small pieces, and the screw rod 2 is pushed into the interval.

[0022] The plastic body continues to be advanced and fully stirred with the input supercritical nitrogen gas or carbon dioxide gas into the plastic body, and the thread angle of the screw rod 2 between the gas check valve 3 and the injection check ring 4 is smaller than the thread between the gas check valve 3 and the inlet 11 of the screw pipe 1, and the thread of the former gradually changes from long to short, the plastic body is quickly pushed and cut, the volume and area of the plastic body contacting with the supercritical nitrogen gas or carbon dioxide gas are increased, more gas enters into the plastic body, forms a dense foam body, and is pushed into the stable pressure storage tank 5 through the injection check ring 4, and the plastic body in foaming state is extruded into the cavity of the molding mold on the injection molding machine through the injection nozzle 6 at the end of the injection molding machine barrel, and the product is obtained after cooling and mold opening.

[0023] Because the supercritical nitrogen gas or carbon dioxide gas belongs to inert gas, first, from the perspective of safety production, it can ensure the safety of production; second, nitrogen and carbon dioxide are the most abundant gases in air, and the extraction difficulty is low, and the production cost is low, which can be said to be truly environmental protection; third, the supercritical state of nitrogen and carbon dioxide is easy to achieve; fourth, the nitrogen has very strong decay resistance, and can keep the sole elasticity for a long time.

Claims

1. A barrel for an injection molding machine used for processing foamed plastic products, comprising a spiral tube, a screw disposed within the spiral tube, and an injection nozzle at the end of the spiral tube, wherein a feed inlet is provided at the front end of the spiral tube; characterized in that: The middle section of the spiral tube is provided with a one-way gas check valve. On the outer edge of the rear section of the spiral tube away from the gas check valve, there is an air inlet hole that penetrates the wall of the spiral tube. The rear end of the spiral tube is provided with a one-way injection check ring. The end of the spiral tube is fixedly connected to a hollow pressure stabilizing storage tank. The other end of the pressure stabilizing storage tank is connected to the injection nozzle.

2. The injection molding machine barrel for processing foamed plastic products according to claim 1, characterized in that: The air inlet holes penetrating the wall of the spiral tube are multiple and evenly distributed.

3. The injection molding machine barrel for processing foamed plastic products according to claim 1, characterized in that: The thread of the screw located between the gas check valve and the injection check ring is different from the thread located between the gas check valve and the feed port of the screw tube. The inclination angle of the former thread is greater than that of the latter thread, and the former thread gradually becomes shorter.

4. The injection molding machine barrel for processing foamed plastic products according to claim 1, characterized in that: Both the gas check valve and the injection check ring are one-way valves.

5. The injection molding machine barrel for processing foamed plastic products according to claim 1, characterized in that: The gas introduced through the air inlet hole penetrating the wall of the solenoid is supercritical nitrogen / carbon dioxide gas.

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