Injection molding device for automobile parts

Abstract

The invention relates to the field of accessory injection molding processing, in particular to an automobile accessory injection molding device which comprises a main body, an upper mold base is fixedly arranged at the upper end of the main body, a pressing plate is arranged above the upper mold base, a lower mold base is fixedly arranged at the bottom of the pressing plate, mold cores are arranged in the upper mold base and the lower mold base, and a fixing plate is fixedly connected to the upper end of the pressing plate through a fixing rod. A raw material stirring barrel, an injection cylinder and a hot air pump are fixedly arranged on the fixing plate, an injection pipe is fixedly arranged at the upper end of the pressing plate, a cavity is formed after the mold core is closed, and the bottom of the injection pipe is communicated with the top of the cavity. The quantitative pre-storage space of the injection molding material is formed by the inner cavity of the valve sleeve, the material injection amount during injection molding each time can be accurately controlled to be kept consistent, then the required total amount of the injection molding material can be accurately achieved by controlling the injection frequency, and the problem that too much or too little injection is likely to happen during one-time injection is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding processing of accessories, and particularly relates to an injection molding device for automotive accessories. Background Art

[0002] Automotive plastic accessories, that is, product accessories on automobiles made of plastic, are widely used in automobiles, among which interior parts are the most common. In the production process of automotive plastic accessories, an injection molding machine is required for injection molding. It is the main molding equipment for making various shaped plastic products by using a plastic molding die with thermoplastic or thermosetting plastics. The injection molding machine can heat the plastic, apply high pressure to the molten plastic, and make it eject and fill the mold cavity.

[0003] Currently, when injecting plastic for automotive accessories, usually an injection screw is used to inject all the molten plastic into the mold cavity at one time. In this process, the injection volume of the molten plastic directly affects the quality of the molding die. Too much or too little injection will affect the molding effect. However, the existing one-time injection method used in injection molding equipment is difficult to accurately control the injection volume, which is not conducive to the molding of plastic accessories. Summary of the Invention

[0004] The purpose of the present invention is to provide an injection molding device for automotive accessories, aiming to solve the above technical problems.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] An injection molding device for automotive accessories includes a main body. A top mold base is fixedly arranged at the upper end of the main body. A pressure plate is arranged above the top mold base. A bottom mold base is fixedly arranged at the bottom of the pressure plate. Mold cores are arranged in both the top mold base and the bottom mold base. The upper end of the pressure plate is fixedly connected to a fixing plate through a fixing rod. A raw material mixing cylinder, an injection cylinder, and a hot air pump are respectively fixedly arranged on the fixing plate. An injection pipe is fixedly arranged at the upper end of the pressure plate. After the mold cores are closed, a cavity is formed. The bottom of the injection pipe is communicated with the top of the cavity.

[0007] An injection molding tube is internally provided with an injection cavity, and a pushing plate is slidably and adaptively installed in the injection cavity. The output end of the injection cylinder is fixedly connected to the pushing plate. The bottom of the raw material mixing cylinder is connected to the injection cavity through a feed pipe. An annular air cavity is arranged inside the outer shell of the injection molding tube, and the hot air pump is connected to the annular air cavity through an air inlet pipe. The bottom of the annular air cavity is connected to the raw material mixing cylinder through a return air pipe. A push rod is fixedly arranged at the bottom of the pushing plate. A valve sleeve is arranged inside the injection molding tube. A feed hole is arranged through the top of the valve sleeve. The bottom of the push rod passes through the feed hole and is fixedly provided with a plug. An active cavity is arranged at the bottom of the valve sleeve, and an injection hole communicating with the cavity is arranged at the bottom of the active cavity. The bottom of the inner cavity of the valve sleeve is connected to the active cavity through a discharge hole. A valve core for controlling the opening and closing of the discharge hole is movably installed in the active cavity.

[0008] As a further solution of the present invention: the diameter of the push rod is smaller than the aperture of the feed hole, the diameter of the plug is larger than the aperture of the feed hole, and the diameter of the plug is smaller than the diameter of the inner cavity of the valve sleeve.

[0009] As a further solution of the present invention: a first magnetic block is fixedly arranged inside the plug, a second magnetic block is fixedly arranged inside the valve core, and the like-named magnetic poles of the first magnetic block and the second magnetic block are arranged oppositely. The top end of the valve core is connected to the active cavity through a tension spring.

[0010] As a further solution of the present invention: an installation cavity is arranged inside the mold core of the lower mold base, and an inverted concave air bag is arranged in the installation cavity. The outer wall of the inverted concave air bag is adaptively attached to the inner wall of the installation cavity.

[0011] As a further solution of the present invention: a first air pipe is connected to the bottom of the inverted concave air bag, the bottom of the first air pipe is connected to the inner cylinder, an outer cylinder is arranged outside the first air pipe and the inner cylinder, and both sides of the inner wall of the inverted concave air bag are connected to the outer cylinder through a second air pipe. An air heater and an air cooler are respectively fixedly arranged between the bottom of the inner cylinder and the outer cylinder. The air inlet of the air heater faces the inner cylinder, the air outlet of the air heater faces the outer cylinder, the air inlet of the air cooler faces the outer cylinder, and the air outlet of the air cooler faces the inner cylinder.

[0012] As a further solution of the present invention: one side of the inner cylinder is connected to one end of a first air duct, one side of the outer cylinder is connected to one end of a second air duct, the other ends of the first air duct and the second air duct are respectively connected to air inlets arranged at the upper end of the main body, and control valves are arranged in both the first air duct and the second air duct.

[0013] As a further solution of the present invention: a heat insulation layer is arranged between the outer wall of the inner cylinder and the inner wall of the outer cylinder.

[0014] As a further solution of the present invention: a sensing pad is fixedly provided on one side of the lower mold base, a distance sensor is fixedly provided on one side of the upper mold base, the distance sensor is arranged opposite to the sensing pad, and the distance sensor is electrically connected to the air heater, the air cooler and the control valve respectively.

[0015] As a further solution of the present invention: lifting cylinders are fixedly arranged on both sides of the upper end of the main body, the output ends of the lifting cylinders are fixedly connected to the pressure plates, guide rods are distributed at the four corners of the upper end of the main body, and the pressure plates are slidably installed on the guide rods.

[0016] Beneficial effects of the present invention:

[0017] (1) By setting up the injection tube, during the injection molding process, the push plate will drive the plug to move downward synchronously through the push rod during the pushing process. At this time, the plug will be separated from the feed hole to open it, and the valve core will also close the discharge hole as the plug moves downward. At this time, the material in the injection cavity will enter the inner cavity of the valve sleeve through the feed hole for storage. When the injection cylinder drives the push plate to move upward until the plug closes the feed hole, the valve core will open the discharge hole as the plug rises. At this time, the material stored in the injection cavity will be injected into the mold cavity through the discharge hole and the injection hole in turn. In each injection molding process, the inner cavity of the valve sleeve is used to form a quantitative pre-storage space for injection molding materials, and the plug and the valve core are used to form a "one-closed-one-closed" opening and closing process control of the feed hole and the discharge hole respectively, so that the material injection amount during each injection molding can be accurately controlled to remain consistent, and then the required total amount of injection molding materials can be accurately achieved by controlling the number of injections, avoiding the problem of excessive or insufficient injection during one-time injection.

[0018] (2) By setting up the inverted concave airbag, when the upper mold base and the lower mold base are closed and the injection begins, the air heater is controlled to be turned on and the air cooler is turned off. At the same time, the control valve in the first air duct is opened and the control valve in the second air duct is closed. The external air enters the inner tube through the first air duct, and is heated by the air heater before entering the outer tube. Then, it enters the inverted concave airbag from the bottom of both sides through the second air duct. The continuously rising hot air gradually squeezes the gas in the inverted concave airbag and discharges it from the first air duct, so that the inverted concave airbag is completely filled with hot air, and the cavity is heated and insulated by the hot air, thereby improving the fluidity of the hot melt material in the cavity during injection, so that the material can fill the cavity to facilitate injection molding.

[0019] (3) When the upper die base and the lower die base are separated, at this time, control the air heater to close and the air cooler to start. At the same time, the control valve in the first air duct closes, and the control valve in the second air duct opens. External air enters the outer cylinder through the second air duct, and after being cooled by the air cooler, it enters the inner cylinder, and then enters the concave airbag from the top through the first air pipe. The continuously sinking cold air will gradually squeeze the air in the concave airbag out through the second air pipe, so that the concave airbag is completely filled with cold air, and use it to cool the cavity, which is beneficial to improving the mold forming efficiency. At the same time, the low temperature helps to quickly demold. Description of the Drawings

[0020] The present invention will be further described below with reference to the drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure after the upper die base and the lower die base of the present invention are closed.

[0023] Figure 3 It is a schematic diagram of the structure of the injection pipe of the present invention.

[0024] Figure 4 is Figure 3 An enlarged schematic diagram of part A in

[0025] Figure 5 It is a schematic diagram of the structure of the concave airbag of the present invention.

[0026] Figure 6 It is another schematic diagram of the structure of the concave airbag of the present invention.

[0027] Figure 7 It is a schematic diagram of the flow of hot air in the concave airbag of the present invention.

[0028] Figure 8 It is a schematic diagram of the flow of cold air in the concave airbag of the present invention.

[0029] In the figure: 1. Main body; 101. Lifting cylinder; 102. Guide rod; 2. Lower die base; 201. Inductive pad; 3. Pressing plate; 301. Fixed rod; 4. Upper die base; 401. Distance sensor; 5. Die core; 501. Cavity; 502. Installation cavity; 6. Fixed plate; 601. Raw material mixing cylinder; 602. Injection cylinder; 603. Hot air pump; 7. Injection pipe; 701. Injection cavity; 702. Pushing plate; 703. Annular air cavity; 704. Feed pipe; 705. Air inlet pipe; 706. Air return pipe; 707. Push rod; 708. Plug; 7081. First magnetic block; 709. Valve sleeve; 7091. Feed hole; 7092. Discharge hole; 7093. Movable cavity channel; 7094. Injection hole; 710. Valve core; 7101. Second magnetic block; 7102. Tension spring; 8. Concave airbag; 801. First air pipe; 802. Inner cylinder; 803. Second air pipe; 804. Outer cylinder; 805. Air heater; 806. Air cooler; 807. First air duct; 808. Second air duct; 809. Heat insulation layer. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0031] Please refer to Figure 1 and Figure 2 As shown in the figure, the present invention is an injection molding device for automobile parts, including a main body 1. An upper die base 4 is fixedly arranged at the upper end of the main body 1. A pressing plate 3 is arranged above the upper die base 4. A lower die base 2 is fixedly arranged at the bottom of the pressing plate 3. Die cores 5 are arranged in both the upper die base 4 and the lower die base 2. The upper end of the pressing plate 3 is fixedly connected to a fixed plate 6 through a fixed rod 301. A raw material mixing cylinder 601, an injection cylinder 602 and a hot air pump 603 are respectively fixedly arranged on the fixed plate 6. An injection pipe 7 is fixedly arranged at the upper end of the pressing plate 3. After the die cores 5 are closed, a cavity 501 is formed. The bottom of the injection pipe 7 is communicated with the top of the cavity 501.

[0032] As Figure 3 and Figure 4As shown in the figure, an injection cavity 701 is provided inside the injection pipe 7. A push plate 702 is slidably and adaptively installed in the injection cavity 701. The output end of the injection cylinder 602 is fixedly connected to the push plate 702. The bottom of the raw material mixing cylinder 601 is connected to the injection cavity 701 through a feed pipe 704. An annular air cavity 703 is provided inside the outer shell of the injection pipe 7. The hot air pump 603 is connected to the annular air cavity 703 through an air inlet pipe 705. The bottom of the annular air cavity 703 is connected to the raw material mixing cylinder 601 through a return air pipe 706. A push rod 707 is fixedly provided at the bottom of the push plate 702. A valve sleeve 709 is provided inside the injection pipe 7. A feed hole 7091 is provided through the top of the valve sleeve 709. The bottom of the push rod 707 passes through the feed hole 7091 and a plug 708 is fixedly provided. An active cavity 7093 is provided at the bottom of the valve sleeve 709. An injection hole 7094 communicating with the cavity 501 is provided at the bottom of the active cavity 7093. The bottom of the inner cavity of the valve sleeve 709 is connected to the active cavity 7093 through a discharge hole 7092. A valve core 710 for controlling the opening and closing of the discharge hole 7092 is movably installed in the active cavity 7093.

[0033] Specifically, by providing the injection pipe 7, during the injection process, the hot melt material in the raw material mixing cylinder 601 enters the injection cavity 701 through the feed pipe 704. At the same time, the injection cylinder 602 starts to push the push plate 702 downward. At this time, the hot air pump 603 pumps hot air into the annular air cavity 703 to keep the inside of the injection pipe 7 at a high temperature, so that the hot melt material maintains good fluidity, which is beneficial to the injection process. At the same time, the flowing hot air is blown into the raw material mixing cylinder 601 through the return air pipe 706, which can preheat the raw materials during the mixing process in advance and effectively improve the utilization efficiency of the hot air.

[0034] More specifically, during injection molding, the pusher plate 702 will drive the plug 708 to move downward synchronously through the push rod 707 during the pushing process. At this time, the plug 708 will disengage from the feed hole 7091 to open it, and at the same time, the valve core 710 will also close the discharge hole 7092 as the plug 708 moves downward. At this time, the material in the injection cavity 701 will enter the inner cavity of the valve sleeve 709 through the feed hole 7091 for storage. When the injection cylinder 602 drives the pusher plate 702 to move upward until the plug 708 closes the feed hole 7091, at this time, the valve core 710 will open the discharge hole 7092 as the plug 708 rises. At this time, the material stored in the injection cavity 701 will be injected into the cavity 501 through the discharge hole 7092 and the injection hole 7094 in sequence. During each injection molding process, the inner cavity of the valve sleeve 709 is used to form a quantitative pre-storage space for the injection molding material, and the "one closed and one opened" opening and closing process control of the feed hole 7091 and the discharge hole 7092 is respectively formed by the plug 708 and the valve core 710, so that the injection amount of the material during each injection molding can be accurately controlled to be consistent (i.e., the volume of the inner cavity of the valve sleeve 709), and then the total amount of the injection molding material required can be accurately achieved by controlling the number of injections, avoiding the problems of excessive or insufficient injection that are likely to occur during one-time injection.

[0035] As Figure 3 shown, the diameter of the push rod 707 is smaller than the aperture of the feed hole 7091, the diameter of the plug 708 is larger than the aperture of the feed hole 7091, and the diameter of the plug 708 is smaller than the diameter of the inner cavity of the valve sleeve 709.

[0036] Specifically, in order to ensure that the plug 708 can completely block the feed hole 7091, the diameter of the plug 708 should be ensured to be larger than the aperture of the feed hole 7091. When pushing the material, the plug 708 disengages from the feed hole 7091, and at this time, the push rod 707 will pass through the feed hole 7091. In order to ensure the smooth entry of the material into the inner cavity of the valve sleeve 709, the diameter of the push rod 707 should be smaller than the aperture of the feed hole 7091, and at the same time, the diameter of the plug 708 should be smaller than the diameter of the inner cavity of the valve sleeve 709, so as to form a space for the molten material to flow through.

[0037] As Figure 3 and Figure 4 shown, a first magnetic block 7081 is fixedly arranged inside the plug 708, a second magnetic block 7101 is fixedly arranged inside the valve core 710, and the like-named magnetic poles of the first magnetic block 7081 and the second magnetic block 7101 are arranged opposite to each other. The top end of the valve core 710 is connected to the movable cavity 7093 through a tension spring 7102.

[0038] Specifically, in the initial state, the plug 708 closes the feed hole 7091. At this time, the valve core 710 will also be suspended at the top in the movable cavity 7093 under the pulling force of the tension spring 7102, so that the discharge hole 7092 and the injection hole 7094 are in an open state. When pushing the material, the valve core 710 moves downward, and the first magnet 7081 will gradually approach the second magnet 7101. Utilizing the characteristic that like magnetic poles repel each other, the valve core 710 gradually overcomes the pulling force of the tension spring 7102 and slides downward until the valve core 710 moves to the bottom of the movable cavity 7093 to close the feed hole 7091 and the injection hole 7094, so that the feed hole 7091 and the discharge hole 7092 always maintain a state of "one closed and one open".

[0039] As Figure 5 and Figure 6 shown, an installation cavity 502 is provided inside the mold core 5 of the lower mold base 2. An inverted concave airbag 8 is provided in the installation cavity 502, and the outer wall of the inverted concave airbag 8 is adaptively attached to the inner wall of the installation cavity 502.

[0040] Furthermore, a first air pipe 801 is connected to the bottom of the inverted concave airbag 8, and the bottom of the first air pipe 801 is connected to the inner cylinder 802. An outer cylinder 804 is provided outside the first air pipe 801 and the inner cylinder 802. Both inner walls of the inverted concave airbag 8 are connected to the outer cylinder 804 through second air pipes 803. An air heater 805 and an air cooler 806 are respectively fixedly provided between the bottom of the inner cylinder 802 and the outer cylinder 804. The air inlet of the air heater 805 faces the inner cylinder 802, the air outlet of the air heater 805 faces the outer cylinder 804, the air inlet of the air cooler 806 faces the outer cylinder 804, and the air outlet of the air cooler 806 faces the inner cylinder 802.

[0041] Even further, one side of the inner cylinder 802 is connected to one end of a first air duct 807, and one side of the outer cylinder 804 is connected to one end of a second air duct 808. The other ends of the first air duct 807 and the second air duct 808 are respectively connected to the air inlets provided at the upper end of the main body 1. Control valves are provided in both the first air duct 807 and the second air duct 808.

[0042] Specifically, as Figure 7As shown in the figure, by setting the concave airbag 8, when the upper mold base 4 and the lower mold base 2 are closed and injection starts, the air heater 805 is controlled to be turned on at this time, and the air cooler 806 is turned off. At the same time, the control valve in the first air duct 807 is opened, and the control valve in the second air duct 808 is closed. External air enters the inner cylinder 802 through the first air duct 807, and after being heated by the air heater 805, it is introduced into the outer cylinder 804. Subsequently, it enters the concave airbag 8 from both sides at the bottom through the second air pipe 803. The continuously rising hot air will gradually squeeze the gas in the concave airbag 8 out through the first air pipe 801, making the concave airbag 8 completely filled with hot air, and using it to heat and keep warm the cavity 501, improving the fluidity of the hot melt material in the cavity 501 during injection, so that the material can fill the cavity 501 to facilitate injection molding.

[0043] As Figure 8 shown, when the upper mold base 4 and the lower mold base 2 are separated, the air heater 805 is controlled to be turned off at this time, and the air cooler 806 is turned on. At the same time, the control valve in the first air duct 807 is closed, and the control valve in the second air duct 808 is opened. External air enters the outer cylinder 804 through the second air duct 808, and after being cooled by the air cooler 806, it passes through the inner cylinder 802. Subsequently, it enters the concave airbag 8 from the top through the first air pipe 801. The continuously sinking cold air will gradually squeeze the air in the concave airbag 8 out through the second air pipe 803, making the concave airbag 8 completely filled with cold air, and using it to cool the cavity 501, which is beneficial to improving the mold forming efficiency. At the same time, the low temperature helps to quickly demold.

[0044] By filling hot air or cold air into the concave airbag 8, it is possible to heat and cool the cavity 501 respectively during the injection stage and the forming and demolding stage according to actual needs. At the same time, using the principle that hot air floats and cold air sinks, different air inlet and outlet methods are adopted in the same set of circulating air paths, so that the hot air or cold air can completely fill the concave airbag 8, ensuring the heating or cooling effect.

[0045] As Figure 6 shown, a heat insulation layer 809 is provided between the outer wall of the inner cylinder 802 and the inner wall of the outer cylinder 804.

[0046] Specifically, when the hot air or cold air in the concave airbag 8 is discharged, the heat insulation layer 809 can minimize the heat exchange of the air in the inner cylinder 802 and the outer cylinder 804, effectively reducing the energy loss.

[0047] As Figure 1As shown in the figure, an induction pad 201 is fixedly arranged on one side of the lower die base 2, and a distance sensor 401 is fixedly arranged on one side of the upper die base 4. The distance sensor 401 is arranged facing the induction pad 201, and the distance sensor 401 is electrically connected to the air heater 805, the air cooler 806, and the control valve respectively.

[0048] In this embodiment, the opening and closing control of the air heater 805, the air cooler 806, and the control valve can be realized manually on the control screen, or can be autonomously realized by using the distance sensor 401 and the induction pad 201. During the mold closing and mold opening processes of the upper die base 4, the distance sensor 401 will perform synchronous lifting displacement along with the upper die base 4. By real-time monitoring the distance change between the distance sensor 401 and the induction pad 201, and accordingly controlling the opening and closing states of the air heater 805, the air cooler 806, and the control valve, intelligent control is achieved, and the degree of automation is improved.

[0049] As Figure 1 shown in the figure, lifting cylinders 101 are fixedly arranged on both sides of the upper end of the main body 1. The output ends of the lifting cylinders 101 are fixedly connected to the pressing plate 3. Guide rods 102 are distributed at the four corners of the upper end of the main body 1. The pressing plate 3 is slidably installed through the guide rods 102.

[0050] The working principle of the present invention: As Figures 1-8As shown, when starting injection molding, the hot melt material in the raw material mixing cylinder 601 enters the injection cavity 701 through the feed pipe 704. At the same time, the injection cylinder 602 starts to push the pushing plate 702 downward. At this time, the hot air pump 603 pumps hot air into the annular air cavity 703 to keep the inside of the injection pipe 7 at a high temperature, so that the hot melt material maintains good fluidity, which is beneficial to the injection process. During the pushing process, the pushing plate 702 will drive the plug 708 to move downward synchronously through the push rod 707. At this time, the plug 708 will disengage from the feed hole 7091 to open it, and at the same time, the valve core 710 will also close the discharge hole 7092 as the plug 708 moves downward. At this time, the material in the injection cavity 701 will enter the inner cavity of the valve sleeve 709 through the feed hole 7091 for storage. When the injection cylinder 602 drives the pushing plate 702 to move upward until the plug 708 closes the feed hole 7091, the valve core 710 will open the discharge hole 7092 as the plug 708 moves upward. At this time, the material stored in the injection cavity 701 will be injected into the cavity 501 successively through the discharge hole 7092 and the injection hole 7094. During each injection molding process, the inner cavity of the valve sleeve 709 is used to form a quantitative pre-storage space for the injection molding material, and the "one closed and one opened" opening and closing process control of the feed hole 7091 and the discharge hole 7092 is respectively formed by the plug 708 and the valve core 710, so that the injection amount of the material during each injection molding can be accurately controlled to be consistent, and then the total amount of the injection molding material required can be accurately achieved by controlling the injection times. When starting to inject material after the upper mold base 4 and the lower mold base 2 are closed, the air heater 805 is controlled to be turned on, the air cooler 806 is turned off, and at the same time, the control valve in the first air duct 807 is opened, and the control valve in the second air duct 808 is closed. The external air enters the inner cylinder 802 through the first air duct 807, and after being heated by the air heater 805, it is introduced into the outer cylinder 804, and then enters the concave airbag 8 from both sides at the bottom through the second air pipe 803. The continuously rising hot air will gradually squeeze the gas in the concave airbag 8 out from the first air pipe 801, so that the concave airbag 8 is completely filled with hot air, and it is used to heat and keep warm the cavity 501, improving the fluidity of the hot melt material in the cavity 501 during injection, so that the material can fill the cavity 501 to be beneficial to injection molding. When the upper mold base 4 and the lower mold base 2 are separated, the air heater 805 is controlled to be turned off, the air cooler 806 is turned on, and at the same time, the control valve in the first air duct 807 is closed, and the control valve in the second air duct 808 is opened. The external air enters the outer cylinder 804 through the second air duct 808, and after being cooled by the air cooler 806, it passes through the inner cylinder 802, and then enters the concave airbag 8 from the top through the first air pipe 801. The continuously sinking cold air will gradually squeeze the air in the concave airbag 8 out from the second air pipe 803, so that the concave airbag 8 is completely filled with cold air, and it is used to cool the cavity 501, which is beneficial to improving the mold forming efficiency, and at the same time, the low temperature helps to quickly demold.

[0051] The above has described in detail an embodiment of the present invention, but the content described above is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. An injection molding device for automobile parts, comprising a main body (1), an upper mold base (4) is fixedly arranged at the upper end of the main body (1), a pressing plate (3) is arranged above the upper mold base (4), a lower mold base (2) is fixedly arranged at the bottom of the pressing plate (3), and mold cores (5) are arranged in both the upper mold base (4) and the lower mold base (2), characterized in that, The upper end of the pressing plate (3) is fixedly connected to a fixing plate (6) through a fixing rod (301). A raw material mixing cylinder (601), an injection cylinder (602), and a hot air pump (603) are respectively and fixedly arranged on the fixing plate (6). An injection pipe (7) is fixedly arranged at the upper end of the pressing plate (3). After the mold core (5) is closed, a cavity (501) is formed. The bottom of the injection pipe (7) is communicated with the top of the cavity (501). An injection cavity (701) is arranged inside the injection pipe (7). A pushing plate (702) is slidably and fittingly installed in the injection cavity (701). The output end of the injection cylinder (602) is fixedly connected to the pushing plate (702). The bottom of the raw material mixing cylinder (601) is communicated with the injection cavity (701) through a feed pipe (704). An annular air cavity (703) is arranged inside the outer shell of the injection pipe (7). The hot air pump (603) is communicated with the annular air cavity (703) through an air inlet pipe (705). The bottom of the annular air cavity (703) is communicated with the raw material mixing cylinder (601) through a return air pipe (706). A push rod (707) is fixedly arranged at the bottom of the pushing plate (702). A valve sleeve (709) is arranged inside the injection pipe (7). A feed hole (7091) is arranged through the top of the valve sleeve (709). The bottom of the push rod (707) passes through the feed hole (7091) and is fixedly provided with a plug (708). An active cavity (7093) is arranged at the bottom of the valve sleeve (709). An injection hole (7094) communicated with the cavity (501) is arranged at the bottom of the active cavity (7093). The bottom of the inner cavity of the valve sleeve (709) is communicated with the active cavity (7093) through a discharge hole (7092). A valve core (710) for controlling the opening and closing of the discharge hole (7092) is movably installed in the active cavity (7093).

2. The injection molding device for automotive parts according to claim 1, wherein, The diameter of the push rod (707) is smaller than the aperture of the feed hole (7091). The diameter of the plug (708) is larger than the aperture of the feed hole (7091). The diameter of the plug (708) is smaller than the inner diameter of the valve sleeve (709).

3. An injection molding device for automotive parts according to claim 2, characterized in that, A first magnetic block (7081) is fixedly arranged inside the plug (708). A second magnetic block (7101) is fixedly arranged inside the valve core (710). The like-named magnetic poles of the first magnetic block (7081) and the second magnetic block (7101) are arranged oppositely. The top end of the valve core (710) is connected to the active cavity (7093) through a tension spring (7102).

4. An injection molding device for automotive parts according to claim 1, characterized in that, An installation cavity (502) is arranged inside the mold core (5) of the lower mold base (2). An inverted concave air bag (8) is arranged inside the installation cavity (502). The outer wall of the inverted concave air bag (8) is fittingly attached to the inner wall of the installation cavity (502).

5. An injection molding device for automotive parts according to claim 4, characterized in that, The bottom of the concave airbag (8) is communicated with a first air pipe (801). The bottom of the first air pipe (801) is communicated with an inner cylinder (802). An outer cylinder (804) is arranged outside the first air pipe (801) and the inner cylinder (802). Both inner walls of the concave airbag (8) are communicated with the outer cylinder (804) through a second air pipe (803). An air heater (805) and an air cooler (806) are respectively and fixedly arranged between the bottom of the inner cylinder (802) and the outer cylinder (804). The air inlet of the air heater (805) faces the inner cylinder (802), and the air outlet of the air heater (805) faces the outer cylinder (804). The air inlet of the air cooler (806) faces the outer cylinder (804), and the air outlet of the air cooler (806) faces the inner cylinder (802).

6. The injection molding device for automotive parts according to claim 5, wherein, One side of the inner cylinder (802) is communicated with one end of a first air duct (807). One side of the outer cylinder (804) is communicated with one end of a second air duct (808). The other ends of the first air duct (807) and the second air duct (808) are respectively communicated with air inlets arranged at the upper end of the main body (1). Control valves are arranged in both the first air duct (807) and the second air duct (808).

7. An injection molding device for automotive parts according to claim 5, characterized in that, A heat insulation layer (809) is arranged between the outer wall of the inner cylinder (802) and the inner wall of the outer cylinder (804).

8. An injection molding device for automotive parts according to claim 6, characterized in that, An induction pad (201) is fixedly arranged on one side of the lower die base (2). A distance sensor (401) is fixedly arranged on one side of the upper die base (4). The distance sensor (401) is arranged directly opposite to the induction pad (201). The distance sensor (401) is electrically connected to the air heater (805), the air cooler (806), and the control valve respectively.

9. An injection molding device for automotive parts according to any one of claims 1-8, characterized in that, Lifting cylinders (101) are fixedly arranged on both sides of the upper end of the main body (1). The output ends of the lifting cylinders (101) are fixedly connected to a pressing plate (3). Guide rods (102) are distributed at the four corners of the upper end of the main body (1). The pressing plate (3) is slidably installed through the guide rods (102).

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