High-gloss colorful injection molding mold exhaust device and exhaust method thereof

Abstract

The invention discloses a highlight colorful injection molding mold exhaust device and an exhaust method thereof, and relates to the field of mold exhaust. A highlight colorful injection molding mold exhaust device comprises a mold frame and further comprises a fitting column fixedly connected to the mold frame, a vacuum pipe is fixedly connected to the fitting column, an air suction pipe is fixedly connected to the vacuum pipe, and an exhaust fan is rotationally connected to the air suction pipe; the plastic products are gathered on the sealing plate, dispersed to the connecting exhaust pipe at the bottom through the sealing plate, penetrate through the bearing plate to reach the interiors of the exhaust pipe groove and the gathering groove, and finally exhaust is accelerated through the supporting plate, so that in the forming process of the plastic products, appearance defects such as gas marks, bubbles and scorching are effectively avoided, and the forming quality of the plastic products is improved. The perfect glossiness and the uniform color of the surface of the product are ensured, and the visual texture and the aesthetic value of the product are greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of rapid positioning of automotive prototype parts, and specifically relates to an exhaust device for a high-gloss multi-color injection molding die. Background Art

[0002] With the increasing diversification of the aesthetic and functional requirements of the consumer market for plastic products, the high-gloss multi-color injection molding technology has been widely used in many fields such as electronics, automotive interiors, and high-end household products due to its ability to endow products with unique appearances and rich colors. In the electronics field, the casings of smart phones, tablet computers and other devices pursue extreme glossiness and color saturation to enhance the texture and visual appeal of the products; for various decorative parts in automotive interiors, such as instrument panels, center consoles, etc., through the high-gloss multi-color injection molding process, not only can the functional requirements be met, but also a luxurious and comfortable atmosphere can be created inside the vehicle; high-end household products such as lamp casings and kitchenware handles also achieve the perfect combination of beauty and practicality with the help of this technology.

[0003] Traditional injection mold exhaust methods mainly rely on simple exhaust grooves or exhaust holes. Exhaust grooves are usually shallow grooves opened on the mold parting surface, and exhaust holes are small holes drilled at specific parts of the mold. However, for the high-gloss multi-color injection molding process, which has extremely strict requirements for the surface quality and color uniformity of products, these traditional exhaust methods have many insurmountable drawbacks. On the one hand, simple exhaust grooves and exhaust holes are prone to poor gas discharge. Especially in complex-shaped mold cavities, gas is likely to accumulate in local areas and cannot be discharged smoothly. On the other hand, if the size of the exhaust groove is not designed properly, the plastic melt may overflow into the exhaust groove during the injection process, which will not only block the exhaust channel, but also form flash on the product surface, affecting the product quality. And it is extremely difficult to precisely control the size of the exhaust groove to avoid melt overflow.

[0004] In addition, with the continuous expansion of the application fields of plastic products, the market's requirements for their appearance and performance continue to rise. In high-end electronic products, users' requirements for the surface flatness and color consistency of products are almost harsh, and any slight defect may cause the product to be criticized by consumers; in the automotive industry, with the rapid development of new energy vehicles, higher requirements are put forward for the environmental protection, lightweight and aesthetics of automotive interior plastic products. Products produced by traditional exhaust technologies are difficult to meet these increasingly strict standards. Therefore, the existing exhaust technologies have gradually been unable to meet the needs of industry development. It is extremely urgent to develop an efficient and reliable exhaust device for high-gloss multi-color injection molding dies, which is of great significance for promoting the technological progress and product upgrading of the injection molding industry. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-gloss and colorful injection molding die exhaust device that can overcome or at least partially solve the above problems.

[0006] To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is: a high-gloss and colorful injection molding die exhaust device, including a die frame, and further including: a fitting column fixedly connected to the die frame, a vacuum tube fixedly connected to the fitting column, an air suction tube fixedly connected to the vacuum tube, and an exhaust fan rotatably connected to the air suction tube; a die plate is clamped on the die frame, a semi-cylinder is fixedly connected to the die plate, a pressing plate is slidably connected to the fitting column, the semi-cylinder corresponds to the pressing plate, a rotating gear is engaged on the pressing plate, and an exhaust fan is fixedly connected to the rotating gear; a fitting groove is opened on the die plate, an exhaust nozzle is fixedly connected to the die plate, and the fitting groove is fixedly connected to the exhaust nozzle.

[0007] Further, a sealing plate is fixedly connected to the die frame, a plurality of connecting exhaust pipes are fixedly connected to the sealing plate, a bearing plate is fixedly connected to the connecting exhaust pipes, an exhaust pipe groove is fixedly connected to the bearing plate, a plurality of connecting exhaust pipes penetrate through the bearing plate and are fixedly connected to the exhaust pipe groove, a collecting groove is fixedly connected to the bearing plate, and a support plate is fixedly connected to the collecting groove.

[0008] Further, a lifting ring is threadedly connected to the die plate, an exhaust nozzle is threadedly connected to the die plate, a fitting groove is opened on the die plate, a semi-cylinder is fixedly connected to the fitting groove, a central control exhaust groove is opened on the die plate, and the fitting groove is opened inside the die plate and communicates with the exhaust nozzle.

[0009] Further, a rotating disk is fixedly connected to the rotating gear, and an exhaust fan is fixedly connected to the rotating disk.

[0010] Further, the pressing plate penetrates through the die plate and corresponds to the sealing plate.

[0011] Further, a plurality of support columns are fixedly connected to the die plate, a filter screen is fixedly connected to the support columns, the filter screen corresponds to the central control exhaust groove, and a plurality of bottom filter pipes are fixedly connected to the die plate, and the bottom filter pipes correspond to the support columns.

[0012] Further, a plurality of positioning columns are fixedly connected to the die plate, a plurality of bottom support pipes are fixedly connected to the die plate, and the positioning columns correspond to the bottom support pipes.

[0013] Further, a die model is fixedly connected to the die plate, and a bottom pipe groove is fixedly connected to the die model.

[0014] Further, a bottom support pipe, a bottom filter pipe, and a bottom pipe groove are fixedly connected to the sealing plate, and the bottom support pipe, the bottom filter pipe, and the bottom pipe groove penetrate through the sealing plate and correspond to the connecting exhaust pipes.

[0015] Furthermore, a method for exhausting air from a high-gloss multi-color injection molding die includes the following steps: S1. During injection molding, the plastic melt is injected into the die cavity. The gas in the cavity first passes through the die model, via the positioning columns around the die model and the bottom pipe groove and bottom support pipe at the bottom of the die model. At the same time, the gas inside the die flows through the support columns to the bottom filter pipe on the sealing plate at the bottom of the die frame, converges on the sealing plate, and then is dispersed by the sealing plate to the bottom connecting exhaust pipe, penetrates the bearing plate to reach the inside of the exhaust pipe groove and the collection groove, and finally is exhausted more quickly via the support plate. This effectively avoids the generation of appearance defects such as air marks, bubbles, and scorching during the molding process of the plastic product, ensures that the surface of the product presents a perfect gloss and uniform color, and greatly improves the visual texture and aesthetic value of the product; S2. During the air exhaust process, the die plate will fit with the die frame. During the fitting process, the fitting groove will fit with the fitting column. The central control exhaust groove in the fitting groove pushes the extrusion plate, the extrusion plate pushes the rotation of the rotating gear, the rotating gear drives the rotation of the rotating disk, the rotating disk drives the rotation of the exhaust fan, the exhaust fan pumps the gas inside the vacuum tube, the vacuum tube pumps the gas between the die frame and the die plate, brings the generated gas into the inside of the fitting groove, the gas inside the fitting groove flows to the exhaust nozzle, and finally flows out via the exhaust nozzle. Since the influence of gas residue on the internal structure of the product is minimized, the dimensional accuracy of the product is significantly improved, the dimensional deviation is controlled within a very small range, and the physical properties of the product such as strength, wear resistance, and corrosion resistance are also effectively guaranteed, the service life of the product is extended, and the competitiveness of the product in the market is enhanced.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: During injection molding of the present invention, the plastic melt is injected into the die cavity. The gas in the cavity first passes through the die model and finally is exhausted more quickly via the support plate. This effectively avoids the generation of appearance defects such as air marks, bubbles, and scorching during the molding process of the plastic product, ensures that the surface of the product presents a perfect gloss and uniform color, and greatly improves the visual texture and aesthetic value of the product.

[0017] During the air exhaust process, the die plate will fit with the die frame. During the fitting process, the fitting groove will fit with the fitting column. The gas inside the fitting groove flows to the exhaust nozzle and finally flows out via the exhaust nozzle. Since the influence of gas residue on the internal structure of the product is minimized, the dimensional accuracy of the product is significantly improved, the dimensional deviation is controlled within a very small range, and the physical properties of the product such as strength, wear resistance, and corrosion resistance are also effectively guaranteed, the service life of the product is extended, and the competitiveness of the product in the market is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the drawings: Figure 1 The front view schematic diagram of an exhaust device for a high-gloss multi-color injection molding die proposed by the present invention; Figure 2 The sectional structure schematic diagram of an exhaust device for a high-gloss multi-color injection molding die proposed by the present invention; Figure 3 An exhaust device for a high-gloss multi-color injection molding die proposed by the present invention Figure 2 The structural schematic diagram at position A in; Figure 4 The structural schematic diagram of the fitting column and the vacuum tube in an exhaust device for a high-gloss multi-color injection molding die proposed by the present invention; Figure 5 The structural schematic diagram of the support column and the positioning column in an exhaust device for a high-gloss multi-color injection molding die proposed by the present invention; Figure 6 An exhaust device for a high-gloss multi-color injection molding die proposed by the present invention Figure 5 The structural schematic diagram at position B in; Figure 7 The structural schematic diagram of the bottom support pipe and the bottom pipe groove in an exhaust device for a high-gloss multi-color injection molding die proposed by the present invention; Figure 8 The structural schematic diagram of the fitting groove and the semi-cylinder in an exhaust device for a high-gloss multi-color injection molding die proposed by the present invention.

[0019] In the figure: 1. Mold frame; 101. Sealing plate; 102. Connecting exhaust pipe; 103. Load-bearing plate; 104. Exhaust pipe groove; 105. Aggregation groove; 11. Mold plate; 12. Suspension ring; 13. Exhaust nozzle; 14. Fitting groove; 15. Central control exhaust groove; 16. Semi-cylinder; 2. Fitting column; 21. Vacuum tube; 22. Rotating gear; 23. Rotating disk; 24. Exhaust fan; 25. Suction pipe; 26. Extrusion plate; 3. Support column; 31. Filter screen; 32. Bottom filter pipe; 4. Positioning column; 41. Bottom support pipe; 5. Mold model; 51. Bottom pipe groove; 6. Support plate. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0021] Embodiment 1: Refer to Figures 1-8, A high-gloss multi-color injection molding die exhaust device, including a die holder 1, further comprising: a fitting column 2 fixedly connected to the die holder 1, a vacuum tube 21 fixedly connected to the fitting column 2, an air suction pipe 25 fixedly connected to the vacuum tube 21, and an exhaust fan 24 rotatably connected to the air suction pipe 25; a die plate 11 is snap-connected to the die holder 1, a semi-cylinder 16 is fixedly connected to the die plate 11, a pressing plate 26 is slidably connected to the fitting column 2, the semi-cylinder 16 corresponds to the pressing plate 26, a rotating gear 22 is engaged with the pressing plate 26, and an exhaust fan 24 is fixedly connected to the rotating gear 22; a fitting groove 14 is opened on the die plate 11, an exhaust nozzle 13 is fixedly connected to the die plate 11, and the fitting groove 14 is fixedly connected to the exhaust nozzle 13.

[0022] A sealing plate 101 is fixedly connected to the die holder 1, a plurality of connecting exhaust pipes 102 are fixedly connected to the sealing plate 101, a bearing plate 103 is fixedly connected to the connecting exhaust pipes 102, an exhaust pipe groove 104 is fixedly connected to the bearing plate 103, and a plurality of connecting exhaust pipes 102 penetrate through the bearing plate 103 and are fixedly connected to the exhaust pipe groove 104. A collecting groove 105 is fixedly connected to the bearing plate 103, and a support plate 6 is fixedly connected to the collecting groove 105.

[0023] During injection molding, the plastic melt is injected into the mold cavity. The gas in the cavity first passes through the mold model 5 and finally is exhausted more quickly through the support plate 6. This effectively avoids the generation of appearance defects such as air marks, bubbles, and burning during the molding process of plastic products, ensuring that the surface of the products presents a perfect gloss and uniform color, greatly enhancing the visual texture and aesthetic value of the products; during the exhaust process, the die plate 11 will fit with the die holder 1. During the fitting process, the fitting groove 14 will fit with the fitting column 2, and the gas inside the fitting groove 14 will flow to the exhaust nozzle 13 and finally flow out through the exhaust nozzle 13. Since the influence of gas residue on the internal structure of the product is minimized, the dimensional accuracy of the product is significantly improved, the dimensional deviation is controlled within a very small range, and the physical properties of the product such as strength, wear resistance, and corrosion resistance are also effectively guaranteed, extending the service life of the product and enhancing the competitiveness of the product in the market.

[0024] A lifting ring 12 is threadedly connected to the die plate 11, an exhaust nozzle 13 is threadedly connected to the die plate 11, a fitting groove 14 is opened on the die plate 11, a semi-cylinder 16 is fixedly connected to the fitting groove 14, a central control exhaust groove 15 is opened on the die plate 11, and the fitting groove 14 is opened inside the die plate 11 and is communicated with the exhaust nozzle 13.

[0025] A rotating disk 23 is fixedly connected to the rotating gear 22, and an exhaust fan 24 is fixedly connected to the rotating disk 23.

[0026] The pressing plate 26 penetrates through the die plate 11 and corresponds to the sealing plate 101.

[0027] A plurality of support columns 3 are fixedly connected to the mold plate 11. A filter screen 31 is fixedly connected to the support column 3. The filter screen 31 corresponds to the central control exhaust groove 15. A plurality of bottom filter pipes 32 are fixedly connected to the mold plate 11. The bottom filter pipes 32 correspond to the support columns 3.

[0028] A plurality of positioning columns 4 are fixedly connected to the mold plate 11. A plurality of bottom support pipes 41 are fixedly connected to the mold plate 11. The positioning columns 4 correspond to the bottom support pipes 41.

[0029] A mold model 5 is fixedly connected to the mold plate 11. A bottom pipe groove 51 is fixedly connected to the mold model 5.

[0030] Bottom support pipes 41, bottom filter pipes 32 and bottom pipe grooves 51 are fixedly connected to the sealing plate 101. The bottom support pipes 41, bottom filter pipes 32 and bottom pipe grooves 51 penetrate through the sealing plate 101 and correspond to the connecting exhaust pipe 102.

[0031] A method for exhausting air in a high-gloss multi-color injection molding mold includes the following steps: S1. During injection molding, the plastic melt is injected into the mold cavity. The gas in the cavity first passes through the mold model 5, and then passes through the positioning columns 4 around the mold model 5 and the bottom pipe groove 51 and bottom support pipe 41 at the bottom of the mold model 5. At the same time, the gas inside the mold flows through the support column 3 to the gas in the bottom filter pipe 32 on the sealing plate 101 at the bottom of the mold frame 1, converges on the sealing plate 101, and then is dispersed by the sealing plate 101 to the bottom connecting exhaust pipe 102, penetrates through the load-bearing plate 103 to reach the inside of the exhaust pipe groove 104 and the collecting groove 105, and finally is exhausted more quickly through the support plate 6. This effectively avoids the generation of appearance defects such as air marks, bubbles, and charring during the molding process of plastic products, ensures that the surface of the products presents a perfect gloss and uniform color, and greatly improves the visual texture and aesthetic value of the products; S2. During the exhaust process, the mold plate 11 will fit with the mold frame 1. During the fitting process, the fitting groove 14 will fit with the fitting post 2. The central control exhaust groove 15 in the fitting groove 14 pushes the extrusion plate 26. The extrusion plate 26 pushes the rotation of the rotating gear 22. The rotating gear 22 drives the rotation of the rotating disk 23. The rotating disk 23 drives the rotation of the exhaust fan 24. The exhaust fan 24 pumps the gas inside the vacuum tube 21. The vacuum tube 21 pumps the gas between the mold frame 1 and the mold plate 11, bringing the generated gas into the interior of the fitting groove 14. The gas inside the fitting groove 14 flows towards the exhaust nozzle 13 and finally flows out through the exhaust nozzle 13. Since the influence of gas residue on the internal structure of the product is minimized, the dimensional accuracy of the product is significantly improved, the dimensional deviation is controlled within a very small range, and the physical properties of the product such as strength, wear resistance, and corrosion resistance are also effectively guaranteed, extending the service life of the product and enhancing the competitiveness of the product in the market.

[0032] Example 2: Refer to Figures 1-8 , a method for exhausting a high-gloss multi-color injection molding mold, comprising the following steps: S1. During injection molding, the plastic melt is injected into the mold cavity. The gas in the cavity first passes through the mold model 5, via the positioning posts 4 around the mold model 5 and the bottom pipe groove 51 and the bottom support pipe 41 at the bottom of the mold model 5. At the same time, the gas inside the mold flows through the support column 3 to the bottom filter pipe 32 on the sealing plate 101 at the bottom of the mold frame 1, converges on the sealing plate 101, and then is dispersed by the sealing plate 101 to the bottom connecting exhaust pipe 102, penetrates the bearing plate 103 to reach the interior of the exhaust pipe groove 104 and the collecting groove 105, and finally accelerates the exhaust through the support plate 6. This effectively avoids the generation of appearance defects such as air marks, bubbles, and burning during the molding process of the plastic product, ensuring that the surface of the product presents a perfect gloss and uniform color, greatly enhancing the visual texture and aesthetic value of the product; S2. During the exhaust process, the mold plate 11 will fit with the mold frame 1. During the fitting process, the fitting groove 14 will fit with the fitting post 2. The central control exhaust groove 15 in the fitting groove 14 pushes the extrusion plate 26. The extrusion plate 26 pushes the rotation of the rotating gear 22. The rotating gear 22 drives the rotation of the rotating disk 23. The rotating disk 23 drives the rotation of the exhaust fan 24. The exhaust fan 24 pumps the gas inside the vacuum tube 21. The vacuum tube 21 pumps the gas between the mold frame 1 and the mold plate 11, bringing the generated gas into the interior of the fitting groove 14. The gas inside the fitting groove 14 flows towards the exhaust nozzle 13 and finally flows out through the exhaust nozzle 13. Since the influence of gas residue on the internal structure of the product is minimized, the dimensional accuracy of the product is significantly improved, the dimensional deviation is controlled within a very small range, and the physical properties of the product such as strength, wear resistance, and corrosion resistance are also effectively guaranteed, extending the service life of the product and enhancing the competitiveness of the product in the market.

[0033] In the present invention, when injection molding, the plastic melt is injected into the mold cavity. The gas in the cavity first passes through the mold model 5 and finally is exhausted more quickly via the support plate 6. This enables the plastic product to effectively avoid the generation of appearance defects such as air marks, bubbles, and charring during the molding process, ensuring that the surface of the product presents a perfect gloss and uniform color, greatly enhancing the visual texture and aesthetic value of the product; during the exhaust process, the mold plate 11 will fit with the mold frame 1. During the fitting process, the fitting groove 14 will fit with the fitting post 2. The gas inside the fitting groove 14 flows towards the exhaust nozzle 13 and finally flows out via the exhaust nozzle 13. Since the influence of gas residue on the internal structure of the product is minimized, the dimensional accuracy of the product is significantly improved, and the dimensional deviation is controlled within a very small range. The physical properties of the product such as strength, wear resistance, and corrosion resistance are also effectively guaranteed, extending the service life of the product and enhancing the competitiveness of the product in the market.

[0034] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art of the present invention can make some changes or modifications to an equivalent embodiment with equivalent changes by using the technical content prompted above within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiment according to the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A high-gloss and multi-color injection molding mold exhaust device, comprising a mold frame (1), characterized in that: Also includes: A fitting column (2) fixedly connected to the mold frame (1), the fitting column (2) being fixedly connected to a vacuum tube (21), the vacuum tube (21) being fixedly connected to an air suction tube (25), and the air suction tube (25) being rotatably connected to an exhaust fan (24); The mold frame (1) is clamped with a mold plate (11), the mold plate (11) is fixedly connected with a semi-cylinder (16), the fitting column (2) is slidably connected with an extrusion plate (26), the semi-cylinder (16) corresponds to the extrusion plate (26), the extrusion plate (26) is meshed with a rotating gear (22), and the rotating gear (22) is fixedly connected with an exhaust fan (24); The mold plate (11) is provided with a fitting groove (14), the mold plate (11) is fixedly connected with an exhaust nozzle (13), and the fitting groove (14) is fixedly connected to the exhaust nozzle (13).

2. The high-gloss and colorful injection molding mold exhaust device according to claim 1, characterized in that: The mold frame (1) is fixedly connected to a sealing plate (101), the sealing plate (101) is fixedly connected to a plurality of connecting exhaust pipes (102), the connecting exhaust pipes (102) are fixedly connected to a load-bearing plate (103), the load-bearing plate (103) is fixedly connected to an exhaust pipe groove (104), the plurality of connecting exhaust pipes (102) penetrate the load-bearing plate (103) and are fixedly connected to the exhaust pipe groove (104), the load-bearing plate (103) is fixedly connected to a collection groove (105), and the collection groove (105) is fixedly connected to a support plate (6).

3. The high-gloss and colorful injection molding mold exhaust device according to claim 1, characterized in that: The mold plate (11) is threadedly connected to a hanging ring (12), the mold plate (11) is threadedly connected to an exhaust nozzle (13), the mold plate (11) is provided with a fitting groove (14), a semi-cylinder (16) is fixedly connected to the fitting groove (14), and the mold plate (11) is provided with a central control exhaust groove (15), the fitting groove (14) is provided inside the mold plate (11) and is connected to the exhaust nozzle (13).

4. The high-gloss and colorful injection molding mold exhaust device according to claim 1, characterized in that: A rotating disk (23) is fixedly connected to the rotating gear (22), and an exhaust fan (24) is fixedly connected to the rotating disk (23).

5. The high-gloss and colorful injection molding mold exhaust device according to claim 1, characterized in that: The extrusion plate (26) penetrates the mold plate (11) and corresponds to the sealing plate (101).

6. The high-gloss and colorful injection molding mold exhaust device according to claim 1, characterized in that: The mold plate (11) is fixedly connected to a plurality of support columns (3), the support columns (3) are fixedly connected to filter screens (31), the filter screens (31) correspond to the central control exhaust slots (15), and the mold plate (11) is fixedly connected to a plurality of bottom filter tubes (32), the bottom filter tubes (32) correspond to the support columns (3).

7. The high-gloss and colorful injection molding mold exhaust device according to claim 1, characterized in that: A plurality of positioning columns (4) are fixedly connected to the mold plate (11), a plurality of bottom support tubes (41) are fixedly connected to the mold plate (11), and the positioning columns (4) correspond to the bottom support tubes (41).

8. The high-gloss and colorful injection molding mold exhaust device according to claim 1, characterized in that: The mold plate (11) is fixedly connected to a mold model (5), and the mold model (5) is fixedly connected to a bottom pipe groove (51).

9. The high-gloss and multi-color injection molding mold exhaust device according to claim 2, characterized in that: The sealing plate (101) is fixedly connected with a bottom support tube (41), a bottom filter tube (32) and a bottom tube groove (51); the bottom support tube (41), the bottom filter tube (32) and the bottom tube groove (51) penetrate the sealing plate (101) and are connected to the exhaust pipe (102) in correspondence.

10. A high-gloss and colorful injection molding mold exhaust method, characterized in that: The high-gloss and colorful injection molding mold exhaust device according to any one of claims 1 to 9 comprises the following steps: S1. During injection molding, plastic melt is injected into the mold cavity, and the gas in the cavity first passes through the mold model (5), and then through the positioning columns (4) around the mold model (5) and the bottom pipe groove (51) and the bottom support pipe (41) at the bottom of the mold model (5). At the same time, the gas inside the mold flows through the support column (3) to the gas of the bottom filter pipe (32) on the sealing plate (101) at the bottom of the mold frame (1), and then converges on the sealing plate (101). Then, the gas is dispersed from the sealing plate (101) to the connecting exhaust pipe (102) at the bottom, passes through the load-bearing plate (103), reaches the inside of the exhaust pipe groove (104) and the collecting groove (105), and finally accelerates exhaust through the support plate (6); S2. During the exhaust process, the mold plate (11) will fit with the mold frame (1). During the mutual fitting process, the fitting groove (14) will fit with the fitting column (2). The central control exhaust groove (15) in the fitting groove (14) pushes the extrusion plate (26). The extrusion plate (26) pushes the rotation of the rotating gear (22). The rotating gear (22) drives the rotation of the rotating disk (23). The rotating disk (23) drives the rotation of the exhaust fan (24). The exhaust fan (24) draws the gas inside the vacuum tube (21). The vacuum tube (21) draws the gas between the mold frame (1) and the mold plate (11), and brings the generated gas to the inside of the fitting groove (14). The gas inside the fitting groove (14) flows to the exhaust nozzle (13) and finally flows out through the exhaust nozzle (13).

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