Automobile seat armrest injection molding machine capable of recycling plastic waste

Abstract

The invention relates to the technical field of plastic recycling and injection molding, and discloses an automobile seat armrest injection molding machine for recycling plastic waste, which comprises a case, a material conveying screw rod arranged at the upper end of the case, a material storage box arranged at the upper end of the material conveying screw rod, a material conveying motor arranged at the side end of the material conveying screw rod, and a conveyor arranged at the upper end of the case, the conveying machine is used for conveying waste in a molten state into the storage box. The injection molding machine further comprises an injection molding unit arranged at the upper end of the machine box. By arranging the fixed mold component, when a molten material is injected into the cavity, the cavity is integrally in a sealed state, so that the molten material can extrude gas in the cavity, the gas flows into the exhaust groove after being pressed and is discharged out of the cavity, meanwhile, the gas pressure in the exhaust groove is gradually increased, and after the gas in the cavity completely enters the exhaust groove, the gas in the cavity is discharged out of the cavity. The baffle plate just shields the exhaust groove, and the filling block fills the gap between the exhaust groove and the filling block to ensure that the interior of the cavity is in a complete shape.

Description

Technical Field

[0001] This invention relates to the technical field of plastic recycling injection molding, and more particularly to an injection molding machine for recycling and reusing plastic waste in automobile seat armrests. Background Technology

[0002] The automotive seat armrest injection molding machine for recycling plastic waste is a specialized injection molding equipment customized for the characteristics of recycled plastics. It is designed to meet the requirements of automotive seat armrest production for material strength and appearance precision, while addressing the pain points of recycled plastics, such as high impurity content, large fluctuations in flowability, and easy degradation. This equipment enables closed-loop recycling of plastic waste, reducing material costs by 20%-40%, saving hundreds of thousands of yuan annually in raw material costs. It also reduces plastic waste emissions, meeting the sustainable development requirements of the automotive industry. The product, after testing, exhibits strength, heat resistance, and aging resistance comparable to virgin materials, meeting industry standards for automotive interior parts.

[0003] In existing injection molding machines, the molten plastic recycled from waste material has poor fluidity during the injection process. If air in the mold cavity and runner is not vented in time (completely vented), or if the mold is not designed with venting channels, or if the venting channels are blocked, air is compressed inside the molten material during high-pressure injection, forming bubbles upon cooling. When the molten material fills, gas inside the cavity can more easily enter, exacerbating bubble formation. Because the cavity is sealed during the injection process, the gap between the existing venting channels and the cavity will affect the overall shape of the part during the injection process. At the same time, it cannot ensure that the gas inside is completely vented, so some gas will still exist inside the molten part in the form of bubbles.

[0004] If air bubbles are close to the surface of the part, they will form bulges, dents, or silver streaks, which will damage the surface flatness and aesthetics of the armrest and fail to meet the appearance acceptance standards of automotive interiors. Air bubbles are equivalent to "cavities" inside the part, which will significantly reduce the tensile strength, bending strength, and impact resistance of the armrest. Car seat armrests need to withstand external forces such as daily pressing and leaning. Internal air bubbles can easily cause the armrest to crack and deform under force, resulting in problems such as assembly precision issues, loosening, and abnormal noises. Summary of the Invention

[0005] In view of the problem that existing technologies have poor fluidity of recycled materials and that bubbles will appear inside the mold cavity after cooling if the gas is not discharged in time (completely discharged), a new injection molding machine for recycling and reusing plastic waste for automobile seat armrests is proposed.

[0006] This application provides an injection molding machine for recycling and reusing plastic waste in automobile seat armrests. The purpose is to: by setting a fixed mold component, when molten material is injected into the cavity, because the cavity is in a sealed state, the molten material will compress the gas inside. After being pressurized, the gas flows into the venting groove and is discharged from the cavity. At the same time, the gas pressure inside the venting groove gradually increases. When the gas inside the cavity has completely entered the venting groove, the baffle plate just blocks the venting groove, and the filling block fills the gap between the two, ensuring that the cavity is in a complete shape while the gas inside the cavity can be discharged in a timely and complete manner.

[0007] The technical solution of the present invention is as follows: an injection molding machine for recycling and reusing plastic waste in automobile seat armrests, comprising a machine housing, a feeding screw disposed at the upper end of the machine housing, a storage tank disposed at the upper end of the feeding screw, a feeding motor disposed at the side end of the feeding screw, and a conveyor disposed at the upper end of the machine housing. The conveyor is used to transport molten plastic waste to the inside of the storage tank. The machine housing also includes an injection molding unit disposed at the upper end of the machine housing. The injection molding unit includes a fixed mold component and a feeding component.

[0008] The fixed mold component includes a fixed module disposed on the upper end of the chassis, a cavity opened inside the fixed module, an injection hole opened inside the fixed module, an exhaust groove opened on the upper end of the inner wall of the cavity, a pressure changing groove opened at one end of the cavity, a pressure changing plate slidably disposed inside the pressure changing groove, a sliding groove opened inside the fixed module, a baffle plate slidably disposed inside the sliding groove, and a synchronization rod disposed between the pressure changing plate and the baffle plate.

[0009] The injection hole is located inside the cavity. One end of the feeding screw is connected to the injection hole. The pressure plate is slidably sealed to the inner wall of the pressure groove. The baffle plate is used to block the exhaust groove. One end of the pressure groove is provided with a motion balancing component. The baffle plate is provided with a filling component.

[0010] Furthermore, the motion balance component includes an air venting groove inside the fixed module and a one-way air valve located at the upper end of the fixed module. One end of the air venting groove is connected to the pressure transformer groove, and the other end of the air venting groove is connected to the one-way air valve.

[0011] Furthermore, the filling component includes a square groove formed on the baffle plate, a connecting plate disposed at the upper end of the inner wall of the square groove, a telescopic spring disposed at the lower end of the connecting plate, and a filling plate disposed at the lower end of the telescopic spring. The thickness of the filling plate is equal to the distance between the lowest end of the exhaust groove and the lowest end of the baffle plate.

[0012] Furthermore, the filling plate is slidably and sealingly connected to the inner wall of the exhaust groove.

[0013] Furthermore, in the initial state, the lowest end of the filling plate and the lowest end of the blocking plate are on the same horizontal plane, and the force on the telescopic spring is in a balanced state.

[0014] Furthermore, the unloading component includes a sliding frame disposed on the upper end of the chassis, a fixed plate disposed on the side wall of the sliding frame, a telescopic rod disposed on the side wall of the fixed plate, a sliding seat plate disposed at one end of the telescopic rod, and a movable mold disposed on the sliding seat plate.

[0015] Furthermore, the movable mold has a mating cavity inside. When the movable mold and the fixed module are fitted together, the mating cavity and the mold cavity form a complete and sealed shape.

[0016] Furthermore, the chassis is provided with a discharge assembly, which includes a discharge trough opened on the side wall of the chassis and an inclined plate disposed inside the discharge trough. The inclined plate is used to guide the injection-molded workpiece out of the chassis.

[0017] The beneficial effects of this invention are:

[0018] 1. By setting up reasonable venting channels, the gas in the mold cavity can be completely discharged. Especially for plastics with poor flowability from waste recycling, it can avoid air bubbles, imprints, and scorch marks caused by compressed air in the mold cavity. The surface flatness and gloss of the car seat armrest can directly meet the standards without additional rework and polishing. At the same time, it eliminates internal voids caused by air entrapment during molten material filling, ensuring the density of the internal structure of the armrest, improving mechanical properties such as tensile strength and bending strength, and meeting the safety standards for use of automotive interior parts. After the gas is discharged, the molten material can smoothly fill the mold cavity along the preset flow channel without short shot or material shortage problems due to gas obstruction. It is especially suitable for complex curved surfaces, corners and other difficult-to-fill areas of the armrest.

[0019] 2. By incorporating a self-filling and sealing filler plate during injection molding, the gaps in the cavity automatically close after venting, restoring the cavity to its intact state. Traditional venting channels, if poorly sized, can cause molten material to overflow, forming flash that requires manual trimming and increases processing costs. The self-filling structure, however, precisely fills the gap between the venting channel and the cavity after venting, forming a tiny "sealing layer" integrated with the product, eliminating the risk of overflow. Simultaneously, the cavity forms a closed space after venting, allowing the melt pressure during the holding pressure stage to be evenly distributed throughout the plastic part, especially in thick-walled areas and corners of the armrest, effectively compensating for shrinkage and preventing vacuum bubbles and shrinkage defects.

[0020] 3. Traditional venting channels are prone to leaving molten material debris, which can clog the venting passages over time and require regular disassembly and cleaning. The self-filling structure eliminates dead corners where molten material can remain, keeping the venting channels unobstructed, reducing mold downtime for maintenance, and preventing overflow from causing wear and corrosion to the edges of the venting channels, thus reducing the frequency of mold polishing and rework and extending the mold's service life. Attached Figure Description

[0021] Figure 1 This is a first-view three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a second-view three-dimensional structural diagram of the present invention;

[0023] Figure 3 This is a schematic diagram of the fixed mold component structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the fixed module of the present invention;

[0025] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0026] Figure 6 This is a three-dimensional structural diagram of the fixed module of the present invention;

[0027] Figure 7 This is a schematic diagram of the filler plate mounting structure of the present invention.

[0028] In the picture:

[0029] 1. Chassis; 2. Feeding screw; 3. Storage bin; 4. Feeding motor; 101. Fixing module; 102. Cavity; 103. Injection hole; 104. Venting groove; 105. Transformer groove; 106. Transformer plate; 107. Sliding groove; 108. Baffle plate; 109. Synchronizing rod; 201. Venting groove; 202. One-way air valve; 301. Square groove; 302. Connecting plate; 303. Telescopic spring; 304. Filling plate; 401. Sliding frame; 402. Fixing plate; 403. Telescopic rod; 404. Sliding seat plate; 405. Moving mold; 501. Discharge groove; 502. Inclined plate. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Example 1, referring to Figures 1-6The first embodiment of the present invention provides an injection molding machine for recycling and reusing plastic waste in automobile seat armrests. It includes a machine housing 1, a feeding screw 2 fixedly installed on the upper end of the machine housing 1, a storage tank 3 fixedly installed on the upper end of the feeding screw 2, a feeding motor 4 fixedly installed on the side end of the feeding screw 2, and a conveyor (not shown in the figure) fixedly installed on the upper end of the machine housing 1. The conveyor is used to transport molten plastic waste to the inside of the storage tank 3. It also includes an injection molding unit installed on the upper end of the machine housing 1. The injection molding unit includes a fixed mold component and a feeding component.

[0032] The fixed mold component includes a fixed module 101 fixedly installed on the upper end of the housing 1, a cavity 102 opened inside the fixed module 101, an injection hole 103 opened inside the fixed module 101, an exhaust groove 104 opened on the upper end of the inner wall of the fixed module 101, a pressure changing groove 105 opened at one end of the cavity 102, a pressure changing plate 106 slidably installed inside the pressure changing groove 105, a sliding groove 107 opened inside the cavity 102, a baffle plate 108 slidably installed inside the sliding groove 107, and a synchronization rod 109 fixedly installed between the pressure changing plate 106 and the baffle plate 108.

[0033] The injection hole 103 is located inside the cavity 102. One end of the feed screw 2 is connected to the injection hole 103. The end face shape and size of the pressure plate 106 are exactly the same as the end face shape and size of the pressure groove 105, and the pressure plate 106 slides sealed on the inner wall of the pressure groove 105. The baffle plate 108 is used to block the venting groove 104. A motion balancing component is provided at one end of the pressure groove 105, and a filling component is installed on the baffle plate 108. The motion balancing component includes a venting groove 201 opened inside the fixed module 101 and a one-way air valve 202 fixedly installed on the upper end of the fixed module 101. One end of the venting groove 201 is connected to the pressure groove 105, and the other end of the venting groove 201 is connected to the one-way air valve 202. A return spring (not shown in the figure) is fixedly installed between the pressure plate 106 and the pressure groove 105.

[0034] Specifically, molten plastic from recycled waste materials has low fluidity. Therefore, when existing injection molding machines inject molten material into the cavity 102 under high pressure, if the gas inside the cavity 102 is not discharged or not completely discharged, the high-pressure injected air is compressed inside the molten material and forms bubbles upon cooling. However, the existing venting process for the cavity 102 cannot accurately determine whether the gas inside the cavity 102 has been completely discharged, which easily leads to incomplete gas discharge. If it is not possible to determine whether the gas inside the cavity 102 has been completely discharged during the venting process, closing the vent too early will result in incomplete gas discharge and the presence of bubbles inside. If closing the vent too late, the molten material may enter the venting channel due to pressure, causing blockage and affecting the service life of the equipment and its subsequent normal use.

[0035] The core of this invention is to solve the above-mentioned problems by designing an automatically opening and closing exhaust groove 104 and a structure that can determine whether the gas inside the cavity 102 has been completely discharged. The specific principle is as follows: In the initial state, the gas inside the cavity 102 is in a free state with large gaps between molecules. When high-pressure plastic is injected to pressurize the inside, the gas inside the cavity 102 is compressed under pressure. At this time, the gaps between gas molecules become smaller, and the volume of the compressed gas becomes smaller. Using the van der Waals equation, the overall volume of a specific volume of gas after compression can be calculated. Therefore, by reasonably designing the volumes of the exhaust groove 104 and the pressure-changing groove 105, the change in volume after the gas is pressurized is equal to the sum of the volumes of the pressure-changing groove 105 and the exhaust groove 104. This allows the baffle plate 108 to just close and block the exhaust groove 104 after the gas inside the exhaust groove 104 is completely discharged. Thus, the exhaust groove 104 can effectively prevent molten plastic from entering the exhaust groove 104 while simultaneously discharging the gas inside the cavity 102.

[0036] Reference Figure 5 As can be seen, the cavity 102 is located above the venting groove 104. Therefore, when the molten plastic is injected into the cavity 102, the molten plastic flows downward under the action of gravity. Since the venting groove 104 is at the top, the molten plastic will not enter the venting groove 104 during injection. Instead, the liquid level gradually rises from bottom to top, and the gas is directly forced into the venting groove 104 under pressure. When the liquid level of the molten plastic rises to the bottom of the venting groove 104, the baffle plate 108 just seals the venting groove 104. Therefore, when the molten material is injected into the cavity 102 under high pressure, the gas inside enters the venting groove 104. As the amount of molten material increases, the gas is gradually squeezed into the venting groove 104. The gas in the venting groove 104 enters the pressure transformer groove 105, causing the pressure transformer plate 106 inside to move horizontally under pressure, which in turn drives the baffle plate 108 on one side to move synchronously. When the gas inside the cavity 102 is completely discharged into the venting groove 104, the pressure transformer plate 106 is at its maximum position, and at this time, the baffle plate 108 just seals the venting groove 104. After the baffle plate 108 seals the lower end of the venting groove 104, the inside of the venting groove 104 is under high pressure.

[0037] The function of the motion balancing component is to enable the baffle plate 108 to move in accordance with the change in gas pressure between the exhaust groove 104 and the pressure transformer groove 105. The pressure transformer plate 106 is an intermediate carrier. However, when the pressure transformer plate 106 is moving, the gas pressure in the space on the left side of the pressure transformer plate 106 must be less than the gas pressure in the space on the right side (i.e., the area connected with the exhaust groove 104). Therefore, by designing the motion balancing component, the gas in the space on the left side of the pressure transformer plate 106 is always connected to the outside space through the venting groove 201. Thus, the pressure transformer plate 106 can slide normally inside the pressure transformer groove 105.

[0038] During use, when the plastic to be recycled is injected into the cavity 102 in a molten state under high pressure, the molten material exerts pressure on the gas inside the sealed cavity 102. At the same time, the molten material flows downward under the action of gravity, and the gas flows upward under the action of pressure. When the gas flows into the exhaust groove 104, the gas pressure inside the exhaust groove 104 gradually increases. Under the action of gas pressure, the gas entering the pressure transformer groove 105 directly acts on one side of the pressure transformer plate 106. After the pressure transformer plate 106 is squeezed, it moves horizontally under the action of pressure. At the same time, the return spring is squeezed and begins to contract and store force. During horizontal movement, the pressure plate 106 drives the corresponding baffle plate 108 to move synchronously via the synchronizing rod 109. When the baffle plate 108 does not completely block the exhaust groove 104, the gas inside the cavity 102 can enter the exhaust groove 104 through the gap. When the gas inside the cavity 102 completely enters the exhaust groove 104, the pressure plate 106 moves to its maximum distance. At this time, the baffle plate 108 just completely blocks the exhaust groove 104. At this time, the gas inside the cavity 102 is completely discharged, and the molten material cannot enter the exhaust groove 104 and cause any impact.

[0039] Example 2, refer to Figures 5-7 This is the second embodiment of the present invention, which differs from the first embodiment in that: the filling assembly includes a square groove 301 formed in the baffle plate 108, a connecting plate 302 fixedly installed on the upper end of the inner wall of the square groove 301, a telescopic spring 303 fixedly installed on the lower end of the connecting plate 302, and a filling plate 304 fixedly installed on the lower end of the telescopic spring 303. The thickness of the filling plate 304 is equal to the distance between the lowermost end of the exhaust groove 104 and the lowermost end of the baffle plate 108. The filling plate 304 is slidably sealed to the inner wall of the exhaust groove 104. In the initial state, the lowermost end of the filling plate 304 and the lowermost end of the baffle plate 108 are on the same horizontal plane, and the force on the telescopic spring 303 is in a balanced state. A vent pipe (not shown in the figure) is fixedly installed on the exhaust groove 104.

[0040] Specifically, the filler plate 304 is slidably installed inside the square groove 301. When the baffle plate 108 completely blocks the venting groove 104, the venting groove 104 is under high pressure. At this time, the high-pressure gas inside the venting groove 104 exerts downward pressure on the filler plate 304, causing the filler plate 304 to move downward in the vertical direction. The distance the filler plate 304 moves is equal to the thickness of the filler plate 304 itself. The function of the filling component is: when the baffle plate 108 completely blocks the venting groove 104, the high-pressure gas inside the venting groove 104 drives the filler plate 304 to move downward, thereby filling the gap between the venting groove 104 and the cavity 102, preventing molten material from entering the gap, which would result in an incomplete product after injection molding and cooling, affecting subsequent production efficiency.

[0041] The filling plate 304 can automatically fill the gap between the two to ensure that the cooled product is exactly the same shape as the cavity 102, which can effectively improve the overall production efficiency and quality and reduce the production rate of defective products. The vent pipe is used to release the high-pressure gas inside the venting groove 104. After cooling is completed, the workers can release the gas inside the venting groove 104 through the vent pipe. At this time, the pressure inside the venting groove 104 returns to normal, and the filling plate 304 quickly resets under the elastic force of the telescopic spring 303. At the same time, the baffle plate 108 quickly resets.

[0042] During use, after the gas inside the cavity 102 is completely discharged into the venting groove 104, the baffle plate 108 seals the venting groove 104. At this time, the filling plate 304 moves downward under the gas pressure of the venting groove 104, and the movement distance is equal to its own thickness. This allows the filling plate 304 to fill the gap between the venting groove 104 and the cavity 102, ensuring that the molten material exists only inside the cavity 102 and remains in a complete shape after cooling. It also prevents the molten material from entering the venting groove 104 and causing blockage or wear. After cooling is complete, the gas inside the venting groove 104 is released through the venting pipe. At this time, the filling plate 304 is fully reset under the elastic force of the telescopic spring 303. Simultaneously, the reset spring resets the transformer plate 106 and the baffle plate 108 for future use.

[0043] The remaining structure is the same as that in Example 1.

[0044] Example 3, referring to Figures 1-2This is the third embodiment of the present invention, which differs from the second embodiment in that: the unloading component includes a sliding frame 401 fixedly installed on the upper end of the housing 1, a fixed plate 402 fixedly installed on the side wall of the sliding frame 401, a telescopic rod 403 fixedly installed on the side wall of the fixed plate 402, a sliding seat plate 404 fixedly installed at one end of the telescopic rod 403, and a movable mold 405 fixedly installed on the sliding seat plate 404. The movable mold 405 has a mating cavity inside. When the movable mold 405 and the fixed module 101 are in contact, the mating cavity and the mold cavity 102 form a complete and sealed shape. An unloading assembly is installed on the housing 1. The unloading assembly includes an unloading trough 501 opened on the upper end of the housing 1, and an inclined plate 502 fixedly installed inside the unloading trough 501. The inclined plate 502 is used to guide the injection-molded workpiece out of the housing 1.

[0045] Specifically, the unloading component is used to unload and collect the cooled product. The cooled plastic is elastic, so it can drive the sliding seat plate 404 and the moving mold 405 to move horizontally via the telescopic rod 403. The telescopic rod 403 pulls the sliding seat plate 404 to move horizontally, and the sliding seat plate 104 drives the moving mold 405 to move synchronously. The mold opens, and at this time, due to the characteristics of cooling and shrinkage, the plastic product is usually tightly wrapped around the core on one side of the moving mold 405 and moves with the moving mold 405. When the mold opens a sufficient distance, the moving mold stops instantly and the product is ejected by inertia and falls onto the inclined plate 502 under the action of gravity, thus completing the rapid unloading (this is prior art and will not be elaborated on here).

[0046] The remaining structure is the same as that in Example 2.

[0047] Based on embodiments 1-3, the working principle of the present invention is as follows: When the molten plastic to be recycled is injected into the cavity 102 under high pressure, the molten material exerts pressure on the gas inside the sealed cavity 102. At the same time, the molten material flows downward under the action of gravity, and the gas flows upward under the action of pressure. When the gas flows into the exhaust groove 104, the gas pressure inside the exhaust groove 104 gradually increases, and under the action of gas pressure, it enters the pressure transformer groove 105 and directly acts on one side of the pressure transformer plate 106. After the pressure transformer plate 106 is squeezed, it moves horizontally under the action of pressure. At the same time, the return spring is squeezed and begins to contract and store force. During horizontal movement, the pressure plate 106 drives the corresponding baffle plate 108 to move synchronously via the synchronizing rod 109. When the baffle plate 108 does not completely block the exhaust groove 104, the gas inside the cavity 102 can enter the exhaust groove 104 through the gap. When the gas inside the cavity 102 completely enters the exhaust groove 104, the pressure plate 106 moves to its maximum distance. At this time, the baffle plate 108 just completely blocks the exhaust groove 104. At this time, the gas inside the cavity 102 is completely discharged, and the molten material cannot enter the exhaust groove 104 and cause any impact.

[0048] After the gas inside the cavity 102 is completely discharged into the venting groove 104, the baffle plate 108 seals the venting groove 104. At this time, the filling plate 304 moves downward under the pressure of the venting groove 104, and the distance of movement is equal to its own thickness. This allows the filling plate 304 to fill the gap between the venting groove 104 and the cavity 102, ensuring that the molten material exists only inside the cavity 102 and remains in a complete shape after cooling. It also prevents the molten material from entering the venting groove 104 and causing blockage or wear. After cooling is complete, the gas inside the venting groove 104 is released through the venting pipe. At this time, the filling plate 304 is fully reset under the elastic force of the telescopic spring 303. Simultaneously, the reset spring resets the transformer plate 106 and the baffle plate 108 for future use.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A car seat armrest injection molding machine for recycling and reusing plastic waste, comprising a machine housing (1), a feeding screw (2) disposed at the upper end of the machine housing (1), a storage tank (3) disposed at the upper end of the feeding screw (2), a feeding motor (4) disposed at the side end of the feeding screw (2), and a conveyor disposed at the upper end of the machine housing (1), wherein the conveyor is used to transport molten plastic waste to the inside of the storage tank (3), characterized in that, It also includes an injection molding unit located at the top of the chassis (1), the injection molding unit including a fixed mold component and a blanking component; The fixed mold component includes a fixed module (101) disposed on the upper end of the housing (1), a cavity (102) opened inside the fixed module (101), an injection hole (103) opened inside the fixed module (101), an exhaust groove (104) opened on the upper end of the inner wall of the cavity (102), a pressure changing groove (105) opened at one end of the cavity (102), a pressure changing plate (106) slidably disposed inside the pressure changing groove (105), a sliding groove (107) opened inside the fixed module (101), a baffle plate (108) slidably disposed inside the sliding groove (107), and a synchronizing rod (109) disposed between the pressure changing plate (106) and the baffle plate (108). The injection hole (103) is located inside the cavity (102). One end of the feeding screw (2) is connected to the injection hole (103). The pressure plate (106) is slidably sealed to the inner wall of the pressure groove (105). The baffle plate (108) is used to block the exhaust groove (104). One end of the pressure groove (105) is provided with a motion balance component. The baffle plate (108) is provided with a filling component.

2. The injection molding machine for recycling and reusing plastic waste in automobile seat armrests according to claim 1, characterized in that, The motion balance component includes an air vent (201) inside the fixed module (101) and a one-way air valve (202) on the upper end of the fixed module (101). One end of the air vent (201) is connected to the transformer groove (105), and the other end of the air vent (201) is connected to the one-way air valve (202).

3. The injection molding machine for recycling and reusing plastic waste in automobile seat armrests according to claim 2, characterized in that, The filling component includes a square groove (301) formed on the baffle plate (108), a connecting plate (302) disposed on the upper end of the inner wall of the square groove (301), a telescopic spring (303) disposed on the lower end of the connecting plate (302), and a filling plate (304) disposed on the lower end of the telescopic spring (303). The thickness of the filling plate (304) is equal to the distance between the lowermost end of the exhaust groove (104) and the lowermost end of the baffle plate (108).

4. The injection molding machine for recycling and reusing plastic waste in automobile seat armrests according to claim 3, characterized in that, The filling plate (304) is slidably sealed to the inner wall of the exhaust groove (104).

5. The injection molding machine for recycling and reusing plastic waste in automobile seat armrests according to claim 4, characterized in that, In the initial state, the lowest end of the filling plate (304) and the lowest end of the shielding plate (108) are on the same horizontal plane, and the force on the extension spring (303) is in equilibrium.

6. The injection molding machine for recycling and reusing plastic waste in automobile seat armrests according to claim 1, characterized in that, The unloading component includes a sliding frame (401) disposed on the upper end of the chassis (1), a fixed plate (402) disposed on the side wall of the sliding frame (401), a telescopic rod (403) disposed on the side wall of the fixed plate (402), a sliding seat plate (404) disposed at one end of the telescopic rod (403), and a movable mold (405) disposed on the sliding seat plate (404).

7. The injection molding machine for recycling and reusing plastic waste in automobile seat armrests according to claim 6, characterized in that, The movable mold (405) has a mating cavity inside. When the movable mold (405) and the fixed module (101) are in contact with each other, the mating cavity and the cavity (102) form a complete and sealed shape.

8. The injection molding machine for recycling and reusing plastic waste in automobile seat armrests according to claim 7, characterized in that, The machine casing (1) is provided with a discharge assembly, which includes a discharge trough (501) opened on the side wall of the machine casing (1) and an inclined plate (502) disposed inside the discharge trough (501). The inclined plate (502) is used to guide the injection-molded workpiece out of the machine casing (1).

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