Injection molding process and injection molding mold device

Abstract

The invention relates to the technical field of injection molding machining, in particular to an injection molding process and an injection molding mold device. The injection molding process comprises a machine body, a servo motor is connected to the bottom of an inner groove of the machine body through bolts, and rotating discs are installed at the opposite positions of the output end of the servo motor and the top of the inner groove of the machine body; a baffle disc is fixedly connected to the middle of the rotating rod, a vertical rod is fixedly connected between the baffle disc and the rotating disc, and the vertical rod penetrates through and is slidably connected with the movable block. According to the injection molding technology and the injection molding mold device, the two sets of upper and lower molds are arranged, when one set of molds completes injection molding and needs to be cleaned, the molds can be moved to the upper and lower positions of the cleaning box through rotation of the rotary column, then the upper and lower molds are moved to the upper and lower positions of the cleaning box, and then the corresponding molds can be cleaned; and the other group of molds are moved to the injection molding position to continue injection molding processing, and shutdown disassembly and replacement are not needed in the process, so that the molds are more convenient to clean, and the injection molding processing is more continuous and smoother.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to an injection molding process and an injection molding mold device. Background Art

[0002] Injection molding is a method of injecting molten plastic material into a mold under high pressure, and obtaining a molded product after cooling and solidification. Injection molding has the advantages of fast production speed, high efficiency, and automated operation. It is suitable for mass production and the molding processing of products with complex shapes. The injection mold is the core component of injection molding. It is a tool used for plastic injection molding. The finished product is obtained by injecting heated molten plastic into the mold cavity and cooling and solidifying it. It is widely used in the production of plastic parts and products, especially suitable for mass production of products with complex geometric shapes and high precision requirements, such as automotive parts, electronic housings, home appliances, toys, etc.

[0003] When the current injection molding mold device is in use, two sets of molds are adapted to each other, and then a plastic solution is added to the gap between the two molds, and the plastic solution is waited for to cool down and molded to obtain the desired injection molded parts. However, during the use of the current injection molding mold device, because the molded injection molded products often have sticky waste, these sticky plastics adhere to the mold surface, and long-term accumulation is likely to affect the subsequent injection molding process, so regular mold cleaning is required. When cleaning the mold, the mold to be cleaned needs to be disassembled and then cleaned with special cleaning equipment. The process requires shutdown and disassembly, and then replacement of the substitute mold. The process is relatively cumbersome, and if the mold is not cleaned in time after the injection molding process is completed, it is easy to cause poor quality of the subsequent injection molded products, which is not conducive to the manufacturing and processing of injection molded products. Summary of the Invention

[0004] The object of the present invention is to provide an injection molding process and an injection molding mold device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection molding mold device, comprising a machine body, a servo motor is bolted to the bottom of the machine body inner groove, a turntable is installed at the relative position of the servo motor output end and the top of the machine body inner groove, a rotating rod is fixedly connected between the two turntables, a baffle is fixedly connected at the middle position of the rotating rod, a vertical rod is fixedly connected between the baffle and the turntable, the vertical rod passes through and is slidably connected to a movable block, wherein the movable block close to the baffle is fixedly connected to the upper mold, and the movable block close to the lower mold is fixedly connected, a hydraulic pump rod is bolted to the relative position of the top and bottom of the opening of the machine body inner groove, the output end of the hydraulic pump rod is fixedly connected to a matching column, the upper mold and the lower mold are fixedly connected to a convex plate on one side relative to the matching column, the convex plate is provided with a matching groove at the position relative to the matching column, and the matching column is adapted to be plugged into the matching groove; The lower fitting column is fixedly connected to a connecting plate on one side close to the opening of the inner groove of the machine body, and the connecting plate has an end away from the fitting column that passes through and is fixedly connected to a liquid injection head. A liquid injection port is provided at the bottom of the lower mold relative to the liquid injection head, and the inner groove side walls on opposite sides of the machine body are fixedly connected to side boxes, and the two side boxes are slidably connected to an upper pressure plate and a lower pressure plate on opposite sides, and the upper and lower pressure plates are fixedly connected to the fitting pressure columns at their positions relative to the fitting grooves, and the side boxes are fixedly connected to a cleaning box near the middle position between the upper and lower pressure plates.

[0006] In a further embodiment, a cleaning groove is provided through the upper and lower parts of the cleaning box, a bidirectional threaded rod is rotatably connected to the middle position inside the cleaning groove, a slider is passed through the bidirectional threaded rod and threadedly connected, the top and bottom of the slider are fixedly connected to horizontal strips, a row of nozzles are fixedly connected to the side of the two horizontal strips away from each other, and a cleaning brush is fixedly connected to the side of the horizontal strip close to the nozzle.

[0007] In a further embodiment, a baffle is fixedly connected to the side wall of the cleaning tank close to the two horizontal strips, and a card slot is provided on the top and bottom of one side of the cleaning box.

[0008] In a further embodiment, a liquid outlet pipe is fixedly connected to the top of the lower pressing plate relative to the liquid injection port, a waste liquid tank is installed at the bottom of the lower pressing plate, and the liquid outlet pipe and the waste liquid tank are communicated with each other.

[0009] In a further embodiment, a slide groove is provided on one side of the side box close to the upper pressure plate and the lower pressure plate, and a slide plate is fixedly connected to the side of the upper pressure plate and the lower pressure plate opposite to the slide groove, and the slide plate is adapted to the slide groove and is slidably connected.

[0010] In a further embodiment, the inner groove of the sliding groove is rotatably connected to a forward and reverse threaded rod, and the forward and reverse threaded rod passes through the slide plate and is threadedly connected.

[0011] In a further embodiment, a spring is fixedly connected between the movable block and the baffle, and a baffle ring is fixedly connected to the other side of the rotating rod close to the movable block.

[0012] In a further embodiment, the bottom end of the injection head is fixedly connected to a delivery pipe, and the bottom end of the delivery pipe is connected to an injection liquid tank.

[0013] In a further embodiment, an induction valve is installed inside the liquid injection port, and the induction method of the induction valve is infrared induction.

[0014] An injection molding process for an injection molding mold device includes the following process steps: Step 1: Start the hydraulic pump rod to drive the fitting column to move toward the convex plate, and then the fitting column is inserted into the fitting groove of the convex plate. Then the upper and lower hydraulic pump rods drive the upper mold and the lower mold to move toward each other. During the movement of the upper mold and the lower mold, the movable block slides on the vertical rod; Step 2: When the upper mold and the lower mold are closed, and the lower fitting column is inserted into the fitting groove below the lower mold, the lower fitting column drives the injection head to be inserted into the injection port through the connecting plate, and then the injection liquid is injected into the gap between the upper mold and the lower mold after the mold is closed. After waiting for the molding time, the injection molding process is completed; Step three, after the injection molding is completed, the upper mold and the lower mold are separated, and then the servo motor is started to drive the turntable and the rotating rod to rotate, and the upper mold and the lower mold that have just been injected are rotated to between the upper pressure plate and the lower pressure plate, while the other set of upper mold and lower mold are rotated to the hydraulic pump rod position. At this time, the upper pressure plate and the lower pressure plate move toward each other on the outside of the side box, and then the matching pressure column is inserted into the matching groove. At this time, the upper pressure plate and the lower pressure plate can push the corresponding upper mold and the lower mold to move toward the cleaning box, and then the upper mold and the lower mold move to the upper and lower positions of the cleaning box. The cleaning box starts to clean the upper mold and the lower mold. After cleaning, the upper mold and the lower mold are reset and can be injection molded again.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides two sets of upper and lower molds. When one set of molds needs to be cleaned after injection molding, the rotating column can be rotated to move it to the upper and lower positions of the cleaning box. Subsequently, the upper and lower molds are moved to the upper and lower positions of the cleaning box to clean the corresponding molds, while the other set of molds is moved to the injection molding position to continue the injection molding process. During the process, there is no need to stop the machine for disassembly and replacement, which makes mold cleaning more convenient and the injection molding process more continuous and smooth. The present invention provides two sets of molds, which can be interchanged for injection molding and cleaning without intervention during the process. This ensures that the injection molding process has strong processing continuity, reduces downtime, and allows the molds to be cleaned in a timely manner, preventing the molds from being uncleaned and affecting the molded product, thereby improving the quality and efficiency of injection molding production. In the present invention, the upper mold and the lower mold are connected through a split hydraulic pump rod, and the hydraulic pump rod is connected to the matching groove of the mold through the matching column at the output end, and then the upper and lower molds are closed. After the mold completes the injection molding process, it can be freely moved to replace another set of molds without disassembling parts, thereby making the injection molding mold device more flexible to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural perspective view of the injection mold device of the present invention; Figure 2 This is a schematic three-dimensional diagram of the structure of the injection mold device of the present invention in an open state; Figure 3 This is a bottom-up perspective schematic diagram of the structure of the injection mold device of the present invention in an open state; Figure 4 It is a schematic structural perspective diagram of the upper and lower molds of the present invention; Figure 5 It is a three-dimensional schematic diagram of the side box structure of the present invention; Figure 6 It is a three-dimensional schematic diagram of the cleaning box structure of the present invention; Figure 7 It is a cross-sectional perspective schematic diagram of the cleaning box structure of the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the method structure; Figure 9 For the present invention Figure 3 Schematic diagram of the method structure at point B.

[0017] In the figure: 1. Machine body; 2. Servo motor; 3. Turntable; 4. Turntable; 5. Stop plate; 6. Vertical rod; 7. Movable block; 8. Upper mold; 9. Lower mold; 10. Hydraulic pump rod; 11. Fitting column; 12. Convex plate; 13. Fitting groove; 14. Connecting plate; 15. Injection head; 16. Injection port; 17. Side box; 18. Upper pressure plate; 19. Lower pressure plate; 20. Fitting pressure column; 21. Cleaning box; 22. Cleaning groove; 23. Bidirectional threaded rod; 24. Slider; 25. Horizontal strip; 26. Nozzle; 27. Cleaning brush; 28. Stop bar; 29. ​​Slot; 30. Liquid outlet pipe; 31. Waste liquid tank; 32. Slide; 33. Slide plate; 34. Forward and reverse threaded rod; 35. Spring; 36. Stop ring; 37. Delivery pipe; 38. Injection liquid tank; 39. Induction valve DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figure 1 - Figure 9 , This embodiment provides an injection molding mold device, including a body 1, a servo motor 2 is bolted to the bottom of the inner groove of the body 1, and a turntable 3 is installed at the output end of the servo motor 2 and the relative position of the top of the inner groove of the body 1, a rotating rod 4 is fixedly connected between the two turntables 3, a baffle 5 is fixedly connected to the middle position of the rotating rod 4, a vertical rod 6 is fixedly connected between the baffle 5 and the turntable 3, the vertical rod 6 passes through and is slidably connected to a movable block 7, wherein the movable block 7 near the baffle 5 is fixedly connected to an upper mold 8, and the movable block 7 near the lower movable block 7 is fixedly connected to a lower mold 9, a hydraulic pump rod 10 is bolted to the relative position of the top and bottom of the inner groove of the body 1 near the opening, and the output end of the hydraulic pump rod 10 is fixedly connected to a matching column 11, and a convex plate 12 is fixedly connected to the side of the upper mold 8 and the lower mold 9 opposite to the matching column 11, and a matching groove 13 is opened on the convex plate 12 relative to the matching column 11, and the matching column 11 is adapted to be plugged into the matching groove 13; Among them, a connecting plate 14 is fixedly connected to the side of the lower fitting column 11 close to the opening of the inner groove of the body 1, and an injection head 15 is passed through the connecting plate 14 at one end away from the fitting column 11, and a liquid injection port 16 is provided at the bottom of the lower mold 9 relative to the liquid injection head 15, and the liquid injection head 15 is adapted to be plugged into the liquid injection port 16. Side boxes 17 are fixedly connected to the side walls of the inner groove on opposite sides of the body 1, and an upper pressure plate 18 and a lower pressure plate 19 are slidably connected to the opposite sides of the two side boxes 17. The upper and lower pressure plates 18 and 19 are fixedly connected to the fitting pressure columns 20 relative to the fitting groove 13, and a cleaning box 21 is fixedly connected to the side box 17 near the middle position between the upper and lower pressure plates 18 and 19.

[0020] Start the hydraulic pump rod 10 to drive the fitting column 11 to move in the direction of the convex plate 12, and then the fitting column 11 is inserted into the fitting groove 13 of the convex plate 12, and then the upper and lower hydraulic pump rods 10 drive the upper mold 8 and the lower mold 9 to move toward each other. During the movement of the upper mold 8 and the lower mold 9, the movable block 7 slides on the vertical rod 6, and the upper mold 8 and the lower mold 9 are closed. At the same time, when the lower fitting column 11 is inserted into the fitting groove 13 below the lower mold 9, the lower fitting column 11 drives the injection head 15 through the connecting plate 14 to be inserted into the injection port 16, and then the injection liquid is injected into the gap after the upper mold 8 and the lower mold 9 are closed. After waiting for the molding time, the injection molding process can be completed. After the injection molding is completed, the upper mold 8 and the lower mold 9 are separated , then start the servo motor 2 to drive the turntable 3 and the rotating rod 4 to rotate, and rotate the upper mold 8 and the lower mold 9 that have just been injected to between the upper pressure plate 18 and the lower pressure plate 19, while the other set of upper molds 8 and lower molds 9 are rotated to the position of the hydraulic pump rod 10. At this time, the upper pressure plate 18 and the lower pressure plate 19 move toward each other on the outside of the side box 17, and then the matching pressure column 20 is inserted into the matching groove 13. At this time, the upper pressure plate 18 and the lower pressure plate 19 can push the corresponding upper mold 8 and the lower mold 9 to move toward the cleaning box 21, and then the upper mold 8 and the lower mold 9 move to the upper and lower positions of the cleaning box 21. The cleaning box 21 starts to clean the upper mold 8 and the lower mold 9. After cleaning, the upper mold 8 and the lower mold 9 are reset and can be injection molded again.

[0021] Example 2: Please refer to Figure 6 - Figure 8 , further improvements were made on the basis of Example 1: A cleaning groove 22 is provided through the top and bottom of the cleaning box 21. A bidirectional threaded rod 23 is rotatably connected to the middle position inside the cleaning groove 22. The bidirectional threaded rod 23 passes through and is threadedly connected to a slider 24. The top and bottom of the slider 24 are fixedly connected to a horizontal strip 25. A row of nozzles 26 are fixedly connected to the side of the two horizontal strips 25 away from each other. The pipeline of the nozzle 26 passes through the horizontal strip 25 and the cleaning box 21 and is connected to the side box 17. A clean water tank is provided inside the side box 17. A water pump is provided inside the clean water tank of the side box 17. The water pump is connected to the nozzle 26 pipeline. The nozzle 26 will spray a special cleaning agent for injection molded plastics, and the nozzle 26 has a pressurizing function. The high-pressure sprayed liquid can remove the injection molded plastics that are adhered to the mold surface. The residue is removed, and then the mold surface is cleaned again by the cleaning brush 27 to improve the cleaning effect. The cleaning brush 27 is fixedly connected to the side of the horizontal plate 25 close to the nozzle 26, and the baffle 28 is fixedly connected to the side wall of the cleaning tank 22 close to the two horizontal plates 25. There are card slots 29 on the top and bottom of one side of the cleaning box 21, and the movable block 7 is adapted to the card slot 29. When the upper mold 8 and the lower mold 9 are moved to the cleaning tank 22 of the cleaning box 21, the movable block 7 is inserted into the card slot 29, so that the upper mold 8 and the lower mold 9 can be accurately inserted into the cleaning tank 22, and the baffle 28 limits them to ensure that the upper mold 8 and the lower mold 9 can be stably cleaned in the cleaning tank 22.

[0022] A liquid outlet pipe 30 is fixedly connected to the top of the lower pressure plate 19 relative to the liquid injection port 16, and a waste liquid tank 31 is installed at the bottom of the lower pressure plate 19. The liquid outlet pipe 30 and the waste liquid tank 31 are connected to each other. The waste liquid tank 31 is installed under the lower pressure plate 19 by bolt connection. The waste liquid tank 31 can be disassembled to process the cleaned waste liquid.

[0023] Example 3: Please refer to Figure 4 、 Figure 6 and Figure 9 , further improvements were made on the basis of Example 1: The cam 33 is connected to the upper and lower molds 32 so that the upper and lower molds 33 can be moved to the lower mold 32, thereby ensuring that the upper and lower molds 33 are in a state of being moved to the lower mold 32.

[0024] The movable block 7 is fixedly connected to the baffle plate 5. When the upper mold 8 and the lower mold 9 are closed by the push of the hydraulic pump rod 10, after the processing is completed, the hydraulic pump rod 10 is reset. At this time, the movable block 7 is pushed back by the spring 35. At this time, the movable block 7 can drive the corresponding upper mold 8 and lower mold 9 to move and separate and reset. The other side of the rotating rod 4 close to the movable block 7 is fixedly connected to the baffle ring 36. When the upper mold 8 and the lower mold 9 are reset, the baffle ring 36 blocks the movable block 7, which can make the upper mold 8 and the lower mold 9 accurately reset to their initial positions. The bottom end of the injection head 15 is fixedly connected to the delivery pipe 37. The delivery pipe 37 is a corrugated telescopic pipe, which can be extended as the injection head 15 rises, otherwise it will rebound and shorten. The bottom end of the delivery pipe 37 is connected to the injection liquid tank 38, and the injection liquid tank 38 is externally connected to the connecting pipeline of the injection liquid storage device, and the injection liquid tank A heater and a pump are provided inside 38, and the pump is connected to the delivery pipe 37 for storing the injection liquid required for one injection, heating the injection liquid to maintain its fluid state, and then transporting it to the injection head 15 by the pump and the delivery pipe 37 for spraying. An induction valve 39 is installed inside the injection port 16, and the induction valve 39 is infrared induction. When the injection head 15 is inserted into the injection port 16, the induction valve 39 senses the insertion of the injection head 15 through infrared sensing, and the induction valve 39 can be opened. Then the injection liquid in the injection liquid tank 38 is transported to the injection port 16 by the delivery pipe 37 and the injection head 15, and then the injection liquid is sprayed into the molding groove body formed by the lower mold 9 and the upper mold 8. After the product between the upper mold 8 and the lower mold 9 is injection-molded, the injection molding process can be completed. Then the upper mold 8 and the lower mold 9 are separated, and the injection molded product can be taken out from it, completing the injection molding process.

[0025] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding mold device, comprising a body (1), characterized in that: The bottom of the inner groove of the machine body (1) is bolted to a servo motor (2), and a turntable (3) is installed at a relative position between the output end of the servo motor (2) and the top of the inner groove of the machine body (1). A rotating rod (4) is fixedly connected between the two turntables (3), and a baffle (5) is fixedly connected to the middle position of the rotating rod (4). A vertical rod (6) is fixedly connected between the baffle (5) and the turntable (3), and the vertical rod (6) passes through and is slidably connected to a movable block (7), wherein the movable block (7) close to the baffle (5) is fixedly connected to an upper mold (8). ), the movable block (7) is fixedly connected to the lower mold (9), the inner groove of the machine body (1) is bolted to the top and bottom relative positions of the opening, the output end of the hydraulic pump rod (10) is fixedly connected to the matching column (11), the upper mold (8) and the lower mold (9) are fixedly connected to the side relative to the matching column (11) with a convex plate (12), the convex plate (12) is provided with a matching groove (13) at a position relative to the matching column (11), and the matching column (11) is adapted to be plugged into the matching groove (13); The lower engaging column (11) is fixedly connected to a connecting plate (14) on one side close to the opening of the inner groove of the machine body (1), and the end of the connecting plate (14) away from the engaging column (11) is penetrated up and down and fixedly connected to a liquid injection head (15), and a liquid injection port (16) is provided at the bottom of the lower mold (9) at a position relative to the liquid injection head (15), and the inner groove side walls on opposite sides of the machine body (1) are fixedly connected to side boxes (17), and the two side boxes (17) are slidably connected to an upper pressure plate (18) and a lower pressure plate (19) on opposite sides, and the upper pressure plate (18) and the lower pressure plate (19) are fixedly connected to a engaging pressure column (20) at a position relative to the engaging groove (13), and the side box (17) is fixedly connected to a cleaning box (21) at a middle position near the upper pressure plate (18) and the lower pressure plate (19).

2. The injection molding die device according to claim 1, characterized in that: The cleaning box (21) is provided with a cleaning groove (22) extending through the upper and lower parts thereof, a bidirectional threaded rod (23) is rotatably connected to the middle position of the inner side of the cleaning groove (22), a slider (24) is passed through the bidirectional threaded rod (23) and is threadedly connected to the slider (24), a horizontal strip (25) is fixedly connected to the top and bottom of the slider (24), a row of nozzles (26) is fixedly connected to the side of the two horizontal strips (25) away from each other, and a cleaning brush (27) is fixedly connected to the side of the horizontal strip (25) close to the nozzle (26).

3. The injection molding mold device according to claim 2, characterized in that: The cleaning tank (22) is fixedly connected to a side wall between two horizontal strips (25) with a blocking bar (28), and a clamping slot (29) is provided on the top and bottom of one side of the cleaning box (21).

4. The injection molding die device according to claim 1, characterized in that: A liquid outlet pipe (30) is fixedly connected to the top of the lower pressing plate (19) relative to the liquid injection port (16), and a waste liquid tank (31) is installed at the bottom of the lower pressing plate (19). The liquid outlet pipe (30) and the waste liquid tank (31) are in communication with each other.

5. The injection molding mold device according to claim 1, characterized in that: A sliding groove (32) is provided on one side of the side box (17) close to the upper pressing plate (18) and the lower pressing plate (19), and a slide plate (33) is fixedly connected to one side of the upper pressing plate (18) and the lower pressing plate (19) relative to the sliding groove (32), and the slide plate (33) is adapted to and slidably connected to the sliding groove (32).

6. The injection molding die device according to claim 5, characterized in that: The inner groove of the sliding groove (32) is rotatably connected to a forward and reverse threaded rod (34), and the forward and reverse threaded rod (34) penetrates and is threadedly connected to the slide plate (33).

7. The injection molding mold device according to claim 1, characterized in that: A spring (35) is fixedly connected between the movable block (7) and the baffle (5), and a baffle ring (36) is fixedly connected to the other side of the rotating rod (4) close to the movable block (7).

8. The injection molding mold device according to claim 1, characterized in that: The bottom end of the liquid injection head (15) is fixedly connected to a delivery pipe (37), and the bottom end of the delivery pipe (37) is connected to an injection liquid tank (38).

9. The injection molding mold device according to claim 1, characterized in that: An induction valve (39) is installed inside the liquid injection port (16), and the induction method of the induction valve (39) is infrared induction.

10. The injection molding process of the injection molding mold device according to any one of claims 1 to 9, characterized in that: The process steps include: Step 1: Start the hydraulic pump rod (10) to drive the fitting column (11) to move in the direction of the convex plate (12), and then the fitting column (11) is inserted into the fitting groove (13) of the convex plate (12). Then, the upper and lower hydraulic pump rods (10) drive the upper mold (8) and the lower mold (9) to move toward each other. During the movement of the upper mold (8) and the lower mold (9), the movable block (7) slides on the vertical rod (6); Step 2: When the upper mold (8) and the lower mold (9) are closed, and the lower fitting column (11) is inserted into the fitting groove (13) below the lower mold (9), the lower fitting column (11) drives the injection head (15) to be inserted into the injection port (16) through the connecting plate (14), and then the injection liquid is injected into the gap between the upper mold (8) and the lower mold (9) after the mold is closed. After waiting for the molding time, the injection molding process is completed; Step 3: After the injection molding is completed, the upper mold (8) and the lower mold (9) are separated, and then the servo motor (2) is started to drive the turntable (3) and the rotating rod (4) to rotate, and the upper mold (8) and the lower mold (9) that have just been injected are rotated to between the upper pressure plate (18) and the lower pressure plate (19), while the other set of upper molds (8) and lower molds (9) are rotated to the position of the hydraulic pump rod (10). At this time, the upper pressure plate (18) and the lower pressure plate (19) move toward each other on the outside of the side box (17). , then the fitting pressure column (20) is inserted into the fitting groove (13), at this time the upper pressing plate (18) and the lower pressing plate (19) can push the corresponding upper mold (8) and the lower mold (9) to move toward the cleaning box (21), then the upper mold (8) and the lower mold (9) are moved to the upper and lower positions of the cleaning box (21), and the cleaning box (21) starts to clean the upper mold (8) and the lower mold (9). After the cleaning is completed, the upper mold (8) and the lower mold (9) are reset and injection molding can be carried out again.

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