Precise plastic part injection molding device

Abstract

The invention discloses a precise plastic part injection molding device, and relates to the field of precise plastic part machining, the precise plastic part injection molding device comprises a fixed base stably placed on the ground, and an injection pipe is fixedly mounted on the inner side of the top of the fixed base; a cover plate is attached to the upper end of the pretreatment tank; a smashing mechanism is arranged in the pretreatment tank, the smashing mechanism is matched with a supporting frame arranged in the pretreatment tank in a sliding mode, the plastic waste can be conveniently and rapidly dissolved, and a melting area is further arranged at the position, below the filter screen and the supporting frame, of the pretreatment tank. According to the precise plastic part injection molding device, plastic waste melting is accelerated, waste gas is promoted to be exhausted through the exhaust pipe and the purification device, the plastic part molding efficiency and quality are improved, bubbles are reduced, waste gas can be effectively treated, environmental pollution can be reduced, and the precise plastic part injection molding device has resource recycling and environmental protection benefits.

Description

Technical Field

[0001] This invention relates to the technical field of precision plastic parts processing, specifically to a precision plastic parts injection molding apparatus. Background Technology

[0002] With the rapid development of the plastic products industry, the production scale of plastic parts is expanding day by day, resulting in a large amount of plastic waste. In the traditional injection molding process of plastic parts, most of the new plastic raw materials are used, which not only causes a huge waste of resources, but also, if a large amount of plastic waste is not effectively treated, it will cause serious pollution to the environment, such as soil pollution and white pollution, and place a heavy burden on the ecological environment.

[0003] Existing plastic injection molding equipment processes and recycles waste plastics, then melts them down for re-injection molding. However, this process is inefficient and not conducive to rapid processing. To address this issue, a plastic injection molding device disclosed in existing technology (Chinese patent application CN202311863571.3, filed on 2023-12-29) can be referenced. This device, with its heat preservation mechanism, maintains a high temperature inside the barrel, ensuring the plastic material is at a suitable injection temperature. It also keeps the injection tube warm, preventing residual plastic material from cooling and solidifying, thus improving processing efficiency. Another reference is existing technology (application CN202210288827.1). A Chinese patent application dated March 23, 2022 discloses an injection molding apparatus for plastic packaging boxes. This apparatus, through its air-cooling mechanism, effectively cools the demolded object, reducing its temperature and preventing injury to users, thus minimizing safety hazards and improving molding efficiency. Finally, a prior art patent application (Chinese patent application number CN201820031260.9, application date January 9, 2018) discloses a rubber and plastic rotary injection molding apparatus. This apparatus heats the material simultaneously using an external heater and an internal heater. The material is extruded to the left by a screw, fed into a fixed mold through a nozzle, and then extruded to the left by a moving mold. The material is then formed between the moving mold and the mold, and finally discharged for cooling. This process ensures more uniform temperature distribution during plastic molding, thereby improving the molding quality of the plastic model.

[0004] While the above methods can improve processing efficiency to some extent, there are still some shortcomings in the actual process. When melting plastic waste, a large amount of harmful gas is generated. This harmful gas will remain inside the heating tank. Excessive waste gas retention will lead to bubbles after melting, which is not conducive to subsequent molding.

[0005] Therefore, we propose a precision plastic parts injection molding apparatus to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide a precision plastic injection molding apparatus to solve the problem mentioned in the background art that current plastic injection molding apparatuses on the market generate a large amount of harmful gas when melting plastic waste. This harmful gas will remain inside the heating tank, and excessive waste gas retention will lead to the presence of bubbles after melting, which is not conducive to subsequent molding processes.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a precision plastic part injection molding device, comprising a fixed base stably placed on the ground, an injection tube fixedly installed on the inner top of the fixed base, a pretreatment tank connected to the upper left side of the injection tube via a control valve, and a control panel for controlling the operation of the device installed on the surface of the fixed base; a cover plate is fitted to the upper end of the pretreatment tank, and the cover plate is raised by an electric push rod fixed to the outer wall of the pretreatment tank; a rotating motor is installed on the outer top of the cover plate, and the output end of the rotating motor is fixed at the top of a rotating square shaft; a crushing mechanism is provided inside the pretreatment tank, which facilitates rapid dissolution of plastic waste; a melting zone is provided below the filter screen and support frame of the pretreatment tank; multiple temperature sensors are installed around the melting zone to provide real-time temperature data to the control panel; an exhaust pipe is connected to the inner top of the pretreatment tank, and the exhaust pipe achieves rapid discharge through a first gas storage mechanism and a second gas storage mechanism provided on one side of the crushing mechanism.

[0008] Preferably, the extrusion end of the injection tube is connected to the inlet end of the molding die, and a conveying auger is rotatably installed inside the injection tube, with the transverse shaft end of the conveying auger fixed to the output end of the drive motor.

[0009] Preferably, a heater is installed on the inner wall of the melting area, the heater is electrically connected to the control panel, an electromagnetic valve is installed inside the exhaust pipe, and an exhaust gas purification device is connected to the outer end of the exhaust pipe. The exhaust gas purification device includes an activated carbon filter layer and a catalytic combustion layer. The control panel is also electrically connected to the electric push rod, and the output end of the electric push rod is fixed on both sides of the lower surface of the cover plate.

[0010] Preferably, the crushing mechanism includes a rotating rod rotatably disposed inside the pretreatment tank, and a material distribution rod is fixed to the outer side of the upper end of the rotating rod to disperse the plastic waste. A hard alloy grinding block is also fixed to the outer side of the middle part of the rotating rod to crush the plastic powder. The bottom of the rotating rod passes through the center of the filter screen, and the bottom of the rotating rod is rotatably disposed on the outer side of the top of the support frame.

[0011] Preferably, the bottom inner side of the filter screen is provided with several sets of grooves, and the inside of the grooves fits with the arc-shaped position of the top of the protruding rod. The bottom position of the protruding rod is fixed to the top position of the filter screen, and the two sides of the filter screen are connected to the inner wall of the pretreatment tank through guide members.

[0012] Preferably, the first gas storage mechanism includes a guide member located at the upper end of the filter screen, and the guide member includes a fixing rod fixed to the upper end of the filter screen. The outer side of the fixing rod is slidably disposed inside the receiving tube. A piston block is also fixed to the outer side of the upper end of the fixing rod. The outer side of the piston block is attached to the inner wall of the receiving tube. The top of the piston block is connected to the top of the inner side of the receiving tube through a return spring. A one-way air outlet is also installed inside the upper end of the receiving tube to allow gas to be discharged from inside the receiving tube into the pretreatment tank. The outer side of the upper end of the receiving tube is connected to a second one-way air inlet pipe. The outer end of the second one-way air inlet pipe extends out of the outer side of the pretreatment tank. A high-precision pressure sensor is installed on the upper inner wall of the pretreatment tank to monitor the pressure inside the tank in real time and transmit it to the control panel.

[0013] Preferably, the second air storage mechanism includes a reciprocating screw fixed to the outer side of the upper end of the support frame, and the outer side of the reciprocating screw is threadedly connected to the inner side of the spiral connecting cylinder. A piston disc is fixed to the top of the spiral connecting cylinder, and the outer wall of the piston disc fits into a mating groove opened inside the lower end of the rotating rod.

[0014] Preferably, the upper end of the rotating rod is provided with a square groove, the inner side of the square groove is attached to the lower outer wall of the rotating square shaft, and a vertically downward air hole is provided at the lower position of the square groove. The bottom end of the air hole is connected to the outer side of the matching slide groove. A one-way air outlet is provided on the upper outer side of the square groove of the rotating rod for gas to enter the interior of the pretreatment tank.

[0015] Preferably, an air inlet is provided at the bottom of the rotating square shaft, and the upper outer side of the air inlet is connected to the first one-way air inlet pipe. The inner side of the first one-way air inlet pipe is rotatably disposed on the outer side of the rotating square shaft, and the upper outer side of the first one-way air inlet pipe extends out of the outer side of the cover plate.

[0016] Preferably, both the first one-way air inlet pipe and the second one-way air inlet pipe are provided with one-way air inlet valves, and the one-way air outlet is also provided with a one-way air outlet valve. The air inlet and the air hole are in a connected state when the cover plate is closed, and the end of the air inlet that contacts the air hole is sealed by a gasket.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This precision plastic part injection molding device, through the cooperation of the crushing mechanism and the melting zone in the pretreatment tank, can efficiently crush and melt plastic waste. Simultaneously, the first and second gas storage mechanisms create a high-pressure environment inside the pretreatment tank, accelerating the melting of plastic waste and promoting the discharge of waste gas through the exhaust pipe and purification device. This not only improves the molding efficiency and quality of plastic parts and reduces bubble generation, but also effectively treats waste gas, reduces environmental pollution, and combines resource recycling and environmental benefits. Specific details are as follows:

[0018] 1. Through the crushing mechanism in the pretreatment tank, the cooperation of the rotating rod, the distributing rod and the grinding block can disperse and crush plastic waste. Combined with the shaking design of the filter screen and the protruding rod, the screen blockage is avoided, and the crushed waste falls quickly into the melting area. After being melted by the heater, it is transported to the molding die through the injection tube, which improves the processing efficiency and molding efficiency of plastic waste.

[0019] 2. By using the first and second gas storage mechanisms, a high-pressure environment is formed in the pretreatment tank. High-pressure melting can accelerate the melting speed of plastic waste and shorten the production cycle. At the same time, the waste gas generated during the melting process can be discharged through the exhaust pipe and waste gas purification device, reducing the bubble phenomenon caused by waste gas retention, which is conducive to ensuring the quality of subsequent molding. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the main cross-sectional structure of the pretreatment tank of the present invention;

[0022] Figure 3 This is a bottom view cross-sectional structural diagram of the pretreatment tank of the present invention;

[0023] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0024] Figure 5 This is a bottom view of the cover plate structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the main structure of the filter screen of the present invention;

[0026] Figure 7 This is a schematic diagram of the main cross-sectional structure of the guide component of the present invention;

[0027] Figure 8 This is a schematic diagram of the main cross-sectional structure of the rotating rod of the present invention;

[0028] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point B.

[0029] In the diagram: 1. Fixed base; 2. Injection tube; 201. Drive motor; 3. Pretreatment tank; 4. Control panel; 5. Electric push rod; 6. Cover plate; 7. Rotating motor; 8. Rotating square shaft; 801. Air inlet; 802. First one-way air inlet pipe; 9. Rotating rod; 901. Square groove; 902. Air hole; 903. Matching slide groove; 904. One-way air outlet; 10. Material distribution rod; 11. Grinding block; 1101. Groove; 12. Filter screen; 13. Support frame; 14. Melting area; 15. Protruding rod; 16. Guide component; 1601. Fixed rod; 1602. Receiving tube; 1603. Piston block; 1604. Return spring; 17. Second one-way air inlet pipe; 18. Reciprocating screw; 19. Spiral connecting cylinder; 20. Piston disc; 21. Exhaust pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1-9 The present invention provides the following technical solution: a precision plastic part injection molding device.

[0032] Example 1: To process plastic waste and facilitate injection into the molding die via injection tube 2, thereby obtaining a compact plastic part, please refer to the attached document. Figure 1 -Appendix Figure 5 The device includes a fixed base 1 stably placed on the ground. An injection tube 2 is fixedly installed on the inner top of the fixed base 1. The upper left end of the injection tube 2 is connected to a pretreatment tank 3 via a control valve. A control panel 4 for controlling the operation of the equipment is also installed on the surface of the fixed base 1. A cover plate 6 is fitted to the upper end of the pretreatment tank 3, and the cover plate 6 is raised by an electric push rod 5 fixed to the outer wall of the pretreatment tank 3. A rotary motor 7 is installed on the outer top of the cover plate 6, and the output end of the rotary motor 7 is fixed to the top of a rotating square shaft 8. A pulverizing mechanism is installed inside the pretreatment tank 3. (See attached diagram.) Figure 3 The crushing mechanism facilitates rapid dissolution of plastic waste. The pretreatment tank 3, located below the filter screen 12 and support frame 13, also features a melting zone 14. Multiple temperature sensors are installed around the melting zone 14 to provide real-time temperature data to the control panel 4. The extrusion end of the injection tube 2 is connected to the inlet end of the molding die. A conveying auger is rotatably installed inside the injection tube 2, and the transverse shaft end of the conveying auger is fixed to the output end of the drive motor 201. A heater is installed on the inner wall of the melting zone 14, and the heater is electrically connected to the control panel 4. A solenoid valve is installed inside the exhaust pipe 21, and the outer end of the exhaust pipe 21 is connected to a waste gas purification device, which includes an activated carbon filter layer and a catalytic combustion layer. The control panel 4 is connected to the electric motor... The push rods 5 are also electrically connected, and the output ends of the electric push rods 5 are fixed on both sides of the lower surface of the cover plate 6; the crushing mechanism includes a rotating rod 9 rotatably installed inside the pretreatment tank 3, and a material distribution rod 10 is fixed on the outer side of the upper end of the rotating rod 9 to disperse the plastic waste. A hard alloy grinding block 11 is also fixed on the outer side of the middle part of the rotating rod 9 to crush the plastic powder. The bottom of the rotating rod 9 passes through the center of the filter screen 12, and the bottom of the rotating rod 9 is rotatably installed on the outer side of the top of the support frame 13; several sets of grooves 1101 are opened on the inner side of the bottom of the filter screen 12, and the inside of the grooves 1101 fits against the arc-shaped position of the top of the protrusion 15. The bottom of the protrusion 15 is fixed to the top of the filter screen 12, and the two sides of the filter screen 12 are connected to the inner wall of the pretreatment tank 3 through guide members 16.

[0033] First, the electric push rod 5, controlled by the control panel 4, opens the cover plate 6, facilitating the feeding of plastic waste into the pretreatment tank 3. Then, by closing the cover plate 6, the rotating square shaft 8, fixed to the output end of the rotating motor 7, embeds into the inner wall of the distributing rod 10 at the top of the rotating rod 9. The rotating motor 7, controlled by the control panel 4, rotates the rotating square shaft 8, causing the rotating rod 9 to rotate and the distributing rod 10, thus dispersing the plastic waste. The plastic waste is then ground and pulverized by the grinding blocks 11 fixed to the outer side of the middle of the rotating rod 9. The pulverized plastic waste is then filtered through the filter screen 12 and falls into the melting zone 14, where it is melted by the heater inside the melting zone 14. Additionally, ... To prevent material blockage at the top of the filter screen 12, during the rotation of the grinding block 11, the grooves 1101 at equal intervals around the center of the grinding block 11 at the bottom of the grinding block 11 will abut against the arc of the protrusion 15, causing the protrusion 15 to vibrate. This, in turn, causes the filter screen 12 to vibrate inside the pretreatment tank 3 via the guide 16. At this time, the crushed plastic waste falls into the melting zone 14 for easy melting. After melting into a fluid, the control valve between the injection tube 2 and the pretreatment tank 3 can be opened, and the drive motor 201 on one side of the injection tube 2 can be started. The output end of the drive motor 201 drives the conveying auger inside the injection tube 2 to extrude the fluid plastic into the molding die. After cooling and demolding, a plastic part can be obtained.

[0034] Example 2: To address the issue that a large amount of harmful gas is generated during the melting of plastic waste, and that this harmful gas remains inside the heating tank, excessive gas retention can lead to bubbles after melting, which is detrimental to subsequent molding processes. Please refer to the attached document. Figure 1 -Appendix Figure 3 and attached Figure 6 -Appendix Figure 9 The upper inner side of the pretreatment tank 3 is also connected to an exhaust pipe 21. The exhaust pipe 21 achieves rapid discharge treatment through the first and second gas storage mechanisms set on one side of the crushing mechanism. The first gas storage mechanism includes a guide 16 set at the upper end of the filter screen 12. (Refer to the attached document.) Figure 7Furthermore, the guide member 16 includes a fixing rod 1601 fixed to the upper end of the filter screen 12, and the outer side of the fixing rod 1601 is slidably disposed inside the receiving tube 1602. A piston block 1603 is also fixed to the outer side of the upper end of the fixing rod 1601. The outer side of the piston block 1603 is attached to the inner wall of the receiving tube 1602, and the top position of the piston block 1603 is connected to the top position of the inner side of the receiving tube 1602 through a return spring 1604. A one-way air outlet is also installed inside the upper end of the receiving tube 1602. Figure 7 This allows gas to be discharged from inside the receiving pipe 1602 into the pretreatment tank 3. The upper outer side of the receiving pipe 1602 is connected to the second one-way inlet pipe 17, the outer end of which extends outward from the pretreatment tank 3. A high-precision pressure sensor is installed on the upper inner wall of the pretreatment tank 3 to monitor the pressure inside the tank in real time and transmit the data to the control panel 4. (See attached diagram) Figure 9 The second air storage mechanism includes a reciprocating screw 18 fixed to the outer side of the upper end of the support frame 13, and the outer side of the reciprocating screw 18 is threadedly connected to the inner side of the spiral connecting cylinder 19. A piston disc 20 is fixed to the top of the spiral connecting cylinder 19, and the outer wall of the piston disc 20 fits into the mating groove 903 opened inside the lower end of the rotating rod 9. A square groove 901 is opened at the upper end of the inner side of the rotating rod 9, and the inner side of the square groove 901 fits into the lower outer wall of the rotating square shaft 8. A vertically downward air hole 902 is opened at the lower position of the square groove 901, and the bottom end of the air hole 902 is connected to the outer side of the mating groove 903. A one-way air outlet 904 is opened at the upper outer side of the square groove 901 on the rotating rod 9 for... Gas enters the interior of the pretreatment tank 3; an air inlet 801 is provided at the bottom of the rotating square shaft 8, and the upper outer side of the air inlet 801 is connected to the first one-way air inlet pipe 802. The inner side of the first one-way air inlet pipe 802 is rotatably set on the outer side of the rotating square shaft 8, and the upper outer side of the first one-way air inlet pipe 802 extends out of the outer side of the cover plate 6; a one-way air inlet valve is provided inside both the first one-way air inlet pipe 802 and the second one-way air inlet pipe 17, and a one-way air outlet valve is also provided inside the one-way air outlet 904. The air inlet 801 and the air hole 902 are connected when the cover plate 6 is closed, and the end of the air inlet 801 that contacts the air hole 902 is sealed by a gasket.

[0035] During the rotation of the filter screen 12 inside the pretreatment tank 3, it drives the first and second gas storage mechanisms to rotate. The two gas storage mechanisms, in operation, transport external gas into the sealed pretreatment tank 3. When the first gas storage mechanism operates, the up-and-down movement of the filter screen 12 guides its movement via the guide member 16. As the guide member 16 moves, the fixed rod 1601 moves back and forth inside the receiving tube 1602. Simultaneously, as the piston block 1603 moves downwards, it passes through the piston block... 1603 and the second one-way intake pipe 17 draw gas into the receiving pipe 1602. When the piston block 1603 moves upward, the piston block 1603 will discharge the gas inside the receiving pipe 1602 through the one-way outlet on one side of the receiving pipe 1602. During the rotation of the rotating rod 9, the rotating rod 9 drives the spiral connecting cylinder 19 to rotate through the setting of the sliding groove 903. Since the spiral connecting cylinder 19 and the reciprocating screw 18 are threadedly connected, the spiral connecting cylinder 19 can move up and down inside the sliding groove 903. Through the setting of the piston disc 20, such as Figure 9 As shown, gas can enter the pretreatment tank 3 through the one-way outlet 904. With this setup, the pretreatment tank 3 is under high pressure. When the sealed pretreatment tank 3 is under high pressure, the following benefits are achieved: First, when the pulverized plastic waste is melted inside the melting zone 14, high-pressure melting accelerates the melting speed and shortens the production cycle. Simultaneously, a stable and uniform melt state reduces equipment failures and product defects caused by raw material issues during production, lowers the defect rate, improves the overall operating efficiency of the production line, and reduces production costs. Second, the gas generated during the melting process... The exhaust gas is released by opening the solenoid valve connected to the exhaust pipe 21. At this time, the pressure drops sharply, causing the gas volume to expand. The high-speed airflow inertia carries the particulate matter out, reducing the subsequent purification load. This allows a large amount of exhaust gas inside the pretreatment tank 3 to be discharged, which is convenient for subsequent molding processing. Third, since the second one-way air inlet pipe 17 is set downwards on the upper outer side of the grinding block 11, it can clean the plastic on the surface of the grinding block 11 by blowing air. Fourth, since the pressurization work of the first and second air storage mechanisms is limited, 0.5MPa-3MPa can improve the crushing efficiency of plastic particles, refine the particle size and reduce agglomeration, and also accelerate the crushing effect.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precision plastic part injection molding device, comprising a fixed base (1) stably placed on the ground, an injection tube (2) fixedly installed on the inner side of the top of the fixed base (1), a pretreatment tank (3) connected to the upper left side of the injection tube (2) through a control valve, and a control panel (4) for controlling the operation of the device installed on the surface of the fixed base (1). Its features are: The upper end of the pretreatment tank (3) is fitted with a cover plate (6), and the cover plate (6) is lifted by an electric push rod (5) fixed to the outer wall of the pretreatment tank (3). A rotating motor (7) is installed on the top outer side of the cover plate (6), and the output end of the rotating motor (7) is fixed at the top position of the rotating square shaft (8). The pretreatment tank (3) is equipped with a crushing mechanism inside. The crushing mechanism facilitates the rapid dissolution of plastic waste. The pretreatment tank (3) is also equipped with a melting zone (14) below the filter screen (12) and support frame (13). Multiple temperature sensors are installed around the melting zone (14) to provide real-time temperature data feedback to the control panel (4). The upper inner side of the pretreatment tank (3) is also connected to an exhaust pipe (21), which is rapidly discharged through the first gas storage mechanism and the second gas storage mechanism set on one side of the crushing mechanism.

2. The precision plastic part injection molding apparatus according to claim 1, characterized in that: The extrusion end of the injection tube (2) is connected to the inlet end of the molding die. The injection tube (2) is equipped with a conveying auger, and the transverse shaft end of the conveying auger is fixed to the output end of the drive motor (201).

3. The precision plastic part injection molding apparatus according to claim 1, characterized in that: A heater is installed on the inner wall of the melting zone (14), and the heater is electrically connected to the control panel (4). An electromagnetic valve is installed inside the exhaust pipe (21), and an exhaust gas purification device is connected to the outer end of the exhaust pipe (21). The exhaust gas purification device includes an activated carbon filter layer and a catalytic combustion layer. The control panel (4) is also electrically connected to the electric push rod (5), and the output end of the electric push rod (5) is fixed on both sides of the lower surface of the cover plate (6). A pressure relief nozzle and a pressure sensor are installed inside the upper end of the cover plate (6).

4. The precision plastic part injection molding apparatus according to claim 1, characterized in that: The crushing mechanism includes a rotating rod (9) rotatably disposed inside the pretreatment tank (3), and a material distribution rod (10) is fixed on the outer side of the upper end of the rotating rod (9) to disperse the plastic waste. A hard alloy is also fixed on the outer side of the middle part of the rotating rod (9) to crush the plastic powder. The bottom position of the rotating rod (9) penetrates the center position of the filter screen (12), and the bottom of the rotating rod (9) is rotatably disposed on the outer side of the top of the support frame (13).

5. The precision plastic part injection molding apparatus according to claim 4, characterized in that: The bottom inner side of the filter screen (12) is provided with several sets of grooves (1101), and the inside of the grooves (1101) is in contact with the arc-shaped position of the top of the protruding rod (15). The bottom position of the protruding rod (15) is fixed at the top position of the filter screen (12). The two sides of the filter screen (12) are also connected to the inner wall of the pretreatment tank (3) through the guide (16).

6. The precision plastic part injection molding apparatus according to claim 5, characterized in that: The first air storage mechanism includes a guide (16) located at the upper end of the filter screen (12), and the guide (16) includes a fixing rod (1601) fixed to the upper end of the filter screen (12). The outer side of the fixing rod (1601) is slidably disposed inside the receiving tube (1602). A piston block (1603) is also fixed to the outer side of the upper end of the fixing rod (1601). The outer side of the piston block (1603) is attached to the inner wall of the receiving tube (1602). The top position of the piston block (1603) is connected to the top inner side of the receiving tube (1602) through a return spring (1604). The receiving tube (1602) is... 2) The upper end of the container is also equipped with a one-way air outlet, which enables the gas to be discharged from the inside of the receiving pipe (1602) into the inside of the pretreatment tank (3). The upper outer side of the receiving pipe (1602) is connected to the second one-way air inlet pipe (17). The outer end of the second one-way air inlet pipe (17) extends out of the outside of the pretreatment tank (3). The middle part of the second one-way air inlet pipe (17) extends to the upper outer side of the grinding block (3) through a tee, so as to blow and clean the waste material adhering to the upper outer side of the grinding block (3). A high-precision pressure sensor is installed on the upper inner wall of the pretreatment tank (3) to monitor the pressure inside the tank in real time and transmit it to the control panel (4).

7. The precision plastic part injection molding apparatus according to claim 1, characterized in that: The second gas storage mechanism includes a reciprocating screw (18) fixed on the outer side of the upper end of the support frame (13), and the outer side of the reciprocating screw (18) is threadedly connected to the inner side of the spiral connecting cylinder (19). A piston disc (20) is fixed on the top of the spiral connecting cylinder (19), and the outer wall of the piston disc (20) is fitted into the mating groove (903) opened inside the lower end of the rotating rod (9).

8. The precision plastic part injection molding apparatus according to claim 7, characterized in that: The upper part of the rotating rod (9) is provided with a square groove (901). The inner side of the square groove (901) is attached to the lower outer wall of the rotating square shaft (8). A vertically downward air hole (902) is provided at the lower part of the square groove (901). The bottom end of the air hole (902) is connected to the outer side of the matching slide groove (903). A one-way air outlet (904) is provided on the upper outer side of the square groove (901) of the rotating rod (9) for gas to enter the interior of the pretreatment tank (3).

9. The precision plastic part injection molding apparatus according to claim 8, characterized in that: An air inlet (801) is provided at the bottom of the rotating square shaft (8), and the upper outer side of the air inlet (801) is connected to the first one-way air inlet pipe (802). The inner side of the first one-way air inlet pipe (802) is rotatably arranged on the outer side of the rotating square shaft (8), and the upper outer side of the first one-way air inlet pipe (802) extends out of the outer side of the cover plate (6).

10. The precision plastic part injection molding apparatus according to claim 9, characterized in that: The first one-way air inlet pipe (802) and the second one-way air inlet pipe (17) are both equipped with one-way air inlet valves. The one-way air outlet (904) is also equipped with a one-way air outlet valve. The air inlet (801) and the air hole (902) are in a connected state when the cover plate (6) is closed. The end of the air inlet (801) that contacts the air hole (902) is sealed by a gasket.

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