One-piece injection molding device and injection molding process for producing luggage covers

Abstract

The present invention discloses an integrated injection molding device and injection molding process for producing luggage covers, which relates to the field related to the production of luggage covers, including a fixed mold fixed in a horizontal position, guide sleeves fixed at the corners of the fixed mold, the output end of the hydraulic push rod fixed at the top center of the movable mold, a coolant delivery pipe extending into the outer side of the bottom of the fixed mold, a feed port for filling materials at the front center of the fixed mold, and exhaust ports for exhausting waste gas at the two sides of the back of the fixed mold. The integrated injection molding device and injection molding process for producing luggage covers are provided with a shaking mechanism, which not only realizes the molding efficiency inside the fixed mold, but also facilitates the demoulding process in the later stage. By setting a stop valve to switch the exhaust mechanism and the demoulding mechanism, the molding efficiency is ensured, and the demoulding work in the later stage is also convenient.

Description

Technical Field

[0001] The present invention relates to the technical field related to the production of luggage covers, and in particular to an integrated molding injection molding device and an injection molding process for the production of luggage covers. Background Art

[0002] The luggage is a combination of a cover and a box body, wherein the cover is made of plastic material or other materials. When producing the plastic luggage cover, a molding injection molding device can be used for coordinated processing;

[0003] The existing cooling device of the molding injection molding device has a relatively simple structure. When cooling the mold, it can only cool the outside of the mold and dissipate heat, but cannot cool the inside of the mold cavity. The cooling effect is poor and the molding speed of the injection molded product cannot be well accelerated.

[0004] In order to overcome the above defects, a cooling device for an injection mold disclosed in the prior art (application number CN202410517034.1, Chinese patent publication date 2024-10-29) can be referred to. The air delivery and cooling component provided in the cooling device for the injection mold can drive the rotary blowing component to rotate around the lower mold base, and the inner cavity heat absorption component cools the lower mold base and the upper mold base from the inside, and the rotary blowing component continuously cools the lower mold base and the upper mold base from the outside, which can accelerate the cooling and molding speed of the injection molded product, thereby increasing the molding rate of the injection molded product and improving the processing efficiency;

[0005] And reference can be made to a cooling device for an injection mold disclosed in the prior art (Chinese patent with application number CN202010727027.6 and publication date 2023-04-18), which heats the water temperature by setting a heater in the outer box, and then cools the injection mold by the heat difference between the hot water and the injection mold itself, and then gradually adds cold water to lower the water temperature to lower the surface temperature of the injection mold, thereby preventing the mold from suddenly cooling down under high temperature and causing problems such as bubbles on the mold surface, thereby improving the mold product yield, and improving the heat dissipation effect by setting an auxiliary radiator on the surface of the outer box;

[0006] At the same time, reference may be made to an injection mold with a rapid cooling structure disclosed in the prior art (Chinese patent application number CN202110263206.3 with a publication date of 2022-10-04). The device draws water out of the water tank through a circulating pump, lowers the water temperature through cooling in the cooling box, and transports it to the cooling device. By immersing the mold, the heat emitted by the mold is taken away, thereby achieving the purpose of cooling the injection mold. The device also uses a wind device to take away part of the heat of the injection mold from the outside.

[0007] Although the above device can quickly cool down the mold, after cooling the inside of the mold, the inside of the mold may need to be demolded. However, after cooling, the existing mold directly demolds the molded product manually, which easily causes damage to the molded product.

[0008] Therefore, we propose an integrated injection molding device and injection molding process for producing luggage covers to solve the above-mentioned problems. Summary of the invention

[0009] The object of the present invention is to provide an integrated injection molding device and injection molding process for the production of bag covers, so as to solve the problem that the internal demolding of the mold on the market is performed manually after cooling, and the molded product is easily damaged.

[0010] To achieve the above-mentioned object, the present invention provides the following technical solution: an integrated molding injection molding device for producing a bag cover, comprising a fixed mold fixed in a horizontal position, a guide sleeve fixed at the four corners of the fixed mold, the outer side of the guide sleeve being slidably arranged on the inner side of the movable mold, and the top position of the guide sleeve being fixed at the four corners of the bottom of the fixed plate;

[0011] It also includes: a hydraulic push rod is fixed at the bottom center of the fixed plate, the output end of the hydraulic push rod is fixed at the top center of the movable mold, a coolant delivery pipe is extended into the outer side of the bottom of the fixed mold, a feeding port for filling materials is opened at the front center of the fixed mold, and exhaust ports for exhausting waste gas are opened at both sides of the rear of the fixed mold;

[0012] Fixed brackets are fixed on both sides of the fixed mold, and a shaking mechanism is arranged inside the fixed bracket. The shaking mechanism can discharge the gas inside the fixed mold. A stop valve is arranged at one end of the fixed mold close to the connecting pipe. The setting of the stop valve realizes switching operation between the discharge mechanism and the demoulding mechanism.

[0013] Preferably, the shaking mechanism includes a dual-axis motor fixedly installed inside a fixed bracket, a rotating rod is fixed at the output end of the dual-axis motor, the end of the rotating rod is fixed at the end of a turntable, a connecting rod is fixed at the center of the turntable, the outer end of the connecting rod is rotatably connected to one end of a support rod, and the other end of the support rod is rotatably set at the back of the knocking block, which can achieve sufficient mixing inside the fixed mold and facilitate the subsequent demolding work.

[0014] Preferably, there are two groups of turntables symmetrically distributed about the center line of the fixed bracket, and the rotation speed and direction of the two groups of fixed brackets are set to the same. The outer side of the knocking block is close to the side wall of the fixed mold, which can facilitate the stable rotation of the turntable.

[0015] Preferably, the exhaust mechanism includes several groups of fixed rods fixed at the rear side of the knocking block, the outer sides of the fixed rods are slidably arranged inside the accommodating tube, the tail end of the accommodating tube is fixed to the surface of the support plate, and one side of the support plate is fixed to one side of the fixed bracket, and a one-way air pipe is connected to the rear side of the accommodating tube, and several groups of the one-way air pipes are connected to the end positions of the connecting pipe, and the connecting pipe extends into the interior of the fixed mold away from one end of the one-way air pipe.

[0016] Preferably, the outer end of the connecting pipe is in the same horizontal plane with the exhaust port, and one side of the connecting pipe is in the same horizontal direction with the air stop valve, which can facilitate the discharge of exhaust gas inside the fixed mold and the movable mold.

[0017] Preferably, the lower end of the connecting tube is connected to a docking tube, the bottom end of the docking tube extends into the interior of the vertical cylinder, the bottom end of the interior of the vertical cylinder is fixed to the bottom end of a connecting spring, the head end of the connecting spring is fixed to the top of a piston block, the top of the piston block is fixed to the bottom of a top block, and air vents are provided on both sides of the top block.

[0018] Preferably, a conical hole is opened inside the bottom end of the piston block, and a conical block is arranged in close contact with the inner wall of the conical hole. The top of the conical block is fixed to the bottom end of the return spring, and the top end of the return spring is fixed inside the piston block, so that the gas can be transported to the inside of the top block through the conical block and discharged through the air vent.

[0019] Preferably, through holes are provided inside the piston block and the top block, and the elastic force of the connecting spring is smaller than the elastic force of the return spring, so the molded product can be lifted first.

[0020] Preferably, the maximum distance that the top block moves is greater than the distance from the lowest air vent to the top of the top block, and the outer side of the top block is tightly fitted to the inside of the fixed mold, so that demoulding is more convenient through the release of gas.

[0021] An integrated molding injection molding device for producing luggage covers, and an injection molding process of the molding injection molding device are also disclosed. The specific method is as follows:

[0022] S1: Heat the plastic raw material and convey it through the feeding port to ensure the closure between the fixed mold and the movable mold;

[0023] S2: Cooling the interior of the fixed mold through the provided coolant delivery pipe, and starting the dual-axis motor to work, so as to realize the operation of the shaking mechanism, and ensure that the air check valve is in an open state. The operation of the shaking mechanism can realize the operation of the exhaust mechanism, and the exhaust gas inside the fixed mold can be discharged through the exhaust port;

[0024] S3: After cooling, the air stop valve can be closed to enable the air stop valve to transport gas through the docking pipe, ensuring that the gas is transported to the demoulding mechanism to eject the ejecting block, making demoulding easier.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the integrated molding injection molding device and the injection molding process for producing the luggage cover are provided with a shaking mechanism, the setting of the shaking mechanism not only realizes the molding efficiency inside the fixed mold, but also facilitates the demoulding process in the later stage, and the switching of the exhaust mechanism and the demoulding mechanism by setting the air check valve ensures the molding efficiency and also facilitates the demoulding process in the later stage. The specific contents are shown as follows:

[0026] 1. A turntable is provided, and the rotation of the turntable can realize the rotation of the connecting rod, and the supporting rod can be driven to rotate through the connecting rod, thereby driving the knocking block to move stably. The knocking block knocks the side wall of the fixed mold, and the material inside the fixed mold can be fully mixed;

[0027] Furthermore, a knocking block is provided, and the knocking block moves back and forth, so that the inside of the knocking block can drive the fixed rod to slide inside the receiving tube, so that the inside of the receiving tube can be transported in one direction through the one-way gas pipe, and the gas inside the fixed mold can be stably transported through the connecting pipe, and discharged through the exhaust port, so as to achieve the exhaust gas discharge work inside the fixed mold;

[0028] 2. An air stop valve is provided. By closing the air stop valve, the exhaust mechanism can be switched to the demoulding mechanism, and the molded parts inside the fixed mold can be demoulded;

[0029] Furthermore, a vertical cylinder is provided, and gas can be delivered to the interior of the vertical cylinder, driving the piston block and the top block to slide stably, so that the molded product inside the fixed mold can be demoulded;

[0030] Furthermore, a piston block is provided. After the top block moves to the maximum position, the gas will be discharged through the conical block provided inside the piston block, so that the gas can be discharged through the air vent, so that the molded part lifted up inside the fixed mold can be fully demolded through the gas setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0032] Figure 2 It is a side view structural schematic diagram of the present invention;

[0033] Figure 3 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0034] Figure 4 This is a schematic diagram of the main structure of the fixing bracket of the present invention;

[0035] Figure 5 It is a schematic diagram of the side view structure of the turntable of the present invention;

[0036] Figure 6 This is a schematic diagram of the main cross-sectional structure of the accommodation tube of the present invention;

[0037] Figure 7 This is a schematic diagram of the cross-sectional structure of a fixed mold of the present invention;

[0038] Figure 8 It is a schematic diagram of the cross-sectional structure of the vertical tube of the present invention;

[0039] Fig. 9 It is a schematic diagram of the main cross-sectional structure of the top block of the present invention.

[0040] In the figure: 1. fixed mold; 2. guide sleeve; 3. movable mold; 4. fixed plate; 5. feed port; 6. hydraulic push rod; 7. coolant delivery pipe; 8. fixed bracket; 9. dual-axis motor; 10. rotating rod; 11. turntable; 12. connecting rod; 13. support rod; 14. knocking block; 15. fixed rod; 16. accommodating tube; 17. support plate; 18. one-way air pipe; 19. connecting pipe; 20. air stop valve; 21. exhaust port; 22. butt-jointing tube; 23. vertical cylinder; 24. connecting spring; 25. piston block; 251. conical block; 252. reset spring; 26. top block; 27. air vent. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figure 1-Figure 9 , the present invention provides the following technical solutions:

[0043] Embodiment 1: In order to facilitate the stable molding of the material inside the fixed mold 1, please refer to the attached Figure 1 -Attached Figure 5, including a fixed mold 1 fixed in a horizontal position, a guide sleeve 2 is fixed at the corners of the fixed mold 1, the outer side of the guide sleeve 2 is slidably arranged on the inner side of the movable mold 3, and the top position of the guide sleeve 2 is fixed at the corners of the bottom of the fixed plate 4; a hydraulic push rod 6 is fixed at the bottom center of the fixed plate 4, and the output end of the hydraulic push rod 6 is fixed at the top center of the movable mold 3, a coolant delivery pipe 7 is extended into the outer side of the bottom of the fixed mold 1, a feeding port 5 for filling materials is opened at the front center of the fixed mold 1, and exhaust ports 21 for exhausting waste gas are opened at both sides of the back of the fixed mold 1. The structure includes a double-axis motor 9 fixedly installed inside a fixed bracket 8, a rotating rod 10 is fixed at the output end of the double-axis motor 9, the end of the rotating rod 10 is fixed at the end of a turntable 11, a connecting rod 12 is fixed at the center of the turntable 11, the outer end of the connecting rod 12 is rotatably connected to one end of a support rod 13, the other end of the support rod 13 is rotatably set at the back of a knocking block 14, the turntable 11 is symmetrically distributed with two groups about the center line of the fixed bracket 8, and the rotation speed and direction of the two groups of fixed brackets 8 are set the same, the outer side of the knocking block 14 is close to the side wall of the fixed mold 1,

[0044] First, the movable mold 3 is driven to slide by the hydraulic push rod 6 to achieve the closure between the fixed mold 1 and the movable mold 3, and then the material is filled between the fixed mold 1 and the guide sleeve 2 through the feeding port 5. In order to facilitate the molding work, the dual-axis motor 9 arranged inside the fixed bracket 8 is first started, so that the output end of the dual-axis motor 9 drives the rotating rod 10 to rotate, and the turntable 11 fixed at the end position of the rotating rod 10 can be rotated. Since the center of the turntable 11 is fixedly connected to the connecting rod 12, the support rod 13 can drive the knocking block 14 to move back and forth, so that the material inside the fixed mold 1 and the guide sleeve 2 can be fully filled, and the material inside the fixed mold 1 and the guide sleeve 2 can be quickly cooled by the conveying work of the coolant delivery pipe 7, thereby ensuring the molding rate of the material inside the fixed mold 1 and the guide sleeve 2.

[0045] Embodiment 2: In order to discharge the gas generated inside the fixed mold 1 and the guide sleeve 2, please refer to the attached Figure 1 -Attached Figure 3 and attached Figure 6, fixed brackets 8 are fixed on the left and right sides of the fixed mold 1, and a shaking mechanism is arranged inside the fixed bracket 8. The shaking mechanism can discharge the gas inside the fixed mold 1. A stop valve 20 is arranged at one end of the fixed mold 1 close to the connecting pipe 19. The setting of the stop valve 20 realizes the switching operation between the discharge mechanism and the demoulding mechanism. The exhaust mechanism includes several groups of fixed rods 15 fixed at the rear side of the knocking block 14. The outer side of the fixed rod 15 is slidably arranged inside the accommodating tube 16. The tail end of the accommodating tube 16 is fixed on the surface of the support plate 17, and one side of the support plate 17 is fixed on one side of the fixed bracket 8. A one-way air supply pipe 18 is connected to the rear side of the accommodating tube 16. Several groups of one-way air supply pipes 18 are connected to the end position of the connecting pipe 19, and the connecting pipe 19 extends into the interior of the fixed mold 1 away from one end of the one-way air supply pipe 18. The outer end of the connecting pipe 19 and the exhaust port 21 are in the same horizontal plane, and one side of the connecting pipe 19 and the air stop valve 20 are in the same horizontal direction, and a one-way air inlet valve is provided on one side of the receiving pipe 16;

[0046] When the knocking block 14 moves back and forth, the back and forth movement of the knocking block 14 can drive the fixed rod 15 to move. At this time, the end of the fixed rod 15 will move inside the accommodating tube 16. Since one end of the accommodating tube 16 is connected to the one-way gas pipe 18, the gas can be stably transported in one direction through the one-way gas pipe 18. Since a one-way air intake valve is provided on one side of the accommodating tube 16, the gas can be stably transported. The gas transported to the inside of the connecting tube 19 by the one-way gas pipe 18 will discharge the exhaust gas inside the fixed mold 1 and the guide sleeve 2, so that the gas inside the fixed mold 1 can be discharged, thereby ensuring the stability of the molded part.

[0047] Embodiment 3: In order to demould the interior of the mold currently on the market, the existing mold is directly demoulded by manual method after cooling, which easily leads to damage to the molded product. Figure 7 -Attached Fig. 9The lower end of the connecting pipe 19 is connected with a butt-joint pipe 22, and the bottom end of the butt-joint pipe 22 extends into the interior of the vertical cylinder 23. The bottom end of the interior of the vertical cylinder 23 is fixed to the bottom end of the connecting spring 24, and the head end of the connecting spring 24 is fixed to the top of the piston block 25. The top of the piston block 25 is fixed to the bottom of the top block 26, and the two sides of the top block 26 are provided with air vents 27. A conical hole is provided inside the bottom end of the piston block 25, and a conical block 251 is provided on the inner wall of the conical hole. The top of the conical block 251 is fixed to the bottom end of the return spring 252, and the top of the return spring 252 is fixed inside the piston block 25. Through holes are provided inside the piston block 25 and the top block 26. The elastic force of the connecting spring 24 is less than the elastic force of the return spring 252. The maximum distance that the top block 26 moves is greater than the distance from the lowest air vent 27 to the top of the top block 26. The outer side of the top block 26 is tightly fitted with the interior of the fixed mold 1.

[0048] When the air stop valve 20 is closed, the connecting pipe 19 can be closed. At this time, the gas will be transported to the inside of the vertical cylinder 23 through the docking pipe 22, and the continuous delivery of gas can enable the piston block 25 to slide inside the vertical cylinder 23, ensuring that the connecting spring 24 is moved, and the top block 26 will also be lifted, so that the position of the molded part inside the fixed mold 1 can be lifted. When the piston block 25 moves to the maximum range, the conical block 251 inside the piston block 25 will be displaced inside the piston block 25 by the return spring 252 as the air pressure increases, so that the gas can be transported to the inside of the top block 26 and discharged through the air vent 27, so that the molded part can be fully demolded.

[0049] An integrated molding injection molding device for producing luggage covers, and an injection molding process of the molding injection molding device are also disclosed. The specific method is as follows:

[0050] S1: heating the plastic raw material and conveying it through the feeding port 5 to ensure that the fixed mold 1 and the movable mold 3 are closed;

[0051] S2: The interior of the fixed mold 1 is cooled through the provided coolant delivery pipe 7, and the dual-axis motor 9 is started to work, so as to realize the operation of the shaking mechanism, and ensure that the air check valve 20 is in an open state. The operation of the shaking mechanism can realize the operation of the exhaust mechanism, and the exhaust gas inside the fixed mold 1 can be discharged through the exhaust port 21;

[0052] S3: After cooling, the air stop valve 20 can be closed to enable the air stop valve 20 to transport the gas through the docking pipe 22, ensuring that the gas is transported to the demoulding mechanism, so that the ejecting block 26 can be ejected, which is convenient for demoulding.

[0053] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated molding injection molding device for producing bag covers, comprising a fixed mold (1) fixed in a horizontal position, guide sleeves (2) fixed at the four corners of the fixed mold (1), the outer side of the guide sleeve (2) being slidably arranged on the inner side of a movable mold (3), and the top of the guide sleeve (2) being fixed at the four corners of the bottom of a fixed plate (4); It is characterized in that Also includes: A hydraulic push rod (6) is fixed at the bottom center of the fixed plate (4), and the output end of the hydraulic push rod (6) is fixed at the top center of the movable mold (3). A coolant delivery pipe (7) extends into the outer side of the bottom of the fixed mold (1). A feeding port (5) is provided at the front center of the fixed mold (1) to facilitate filling of materials. Exhaust ports (21) are provided at both sides of the rear of the fixed mold (1) to facilitate exhaust gas discharge. Fixed brackets (8) are fixed on both left and right sides of the fixed mold (1), and a shaking mechanism is arranged inside the fixed bracket (8). The shaking mechanism can discharge the gas inside the fixed mold (1). A stop valve (20) is arranged at one end of the fixed mold (1) close to the connecting pipe (19). The stop valve (20) is arranged to switch the transported gas between the exhaust mechanism and the demoulding mechanism. The lower end of the connecting pipe (19) is connected to a butt-joint pipe (22), the bottom end of the butt-joint pipe (22) extends into the interior of the vertical cylinder (23), the bottom end of the interior of the vertical cylinder (23) is fixed to the bottom end of a connecting spring (24), the head end of the connecting spring (24) is fixed to the bottom end of a piston block (25), the top of the piston block (25) is fixed to the bottom of a top block (26), and air vents (27) are provided on both sides of the top block (26); A conical hole is formed inside the bottom end of the piston block (25), and a conical block (251) is arranged in close contact with the inner wall of the conical hole. The top of the conical block (251) is fixed to the bottom end of the return spring (252), and the top end of the return spring (252) is fixed inside the piston block (25); The piston block (25) and the top block (26) are both provided with through holes. The elastic force of the connecting spring (24) is smaller than the elastic force of the return spring (252). The through hole of the top block (26) is connected to the air vent (27). The gas in the connecting pipe (19) discharges the waste gas in the fixed mold (1) and the movable mold (3). When the air stop valve (20) is closed, the connecting pipe (19) is closed. At this time, the gas is transported to the inside of the vertical cylinder (23) through the connecting pipe (22), thereby lifting the top block (26).

2. The one-piece injection molding device for producing bag covers according to claim 1, characterized in that: The shaking mechanism comprises a dual-axis motor (9) fixedly mounted inside a fixed bracket (8), a rotating rod (10) being fixed at the output end of the dual-axis motor (9), an end of the rotating rod (10) being fixed at the end of a rotating disk (11), a connecting rod (12) being fixed at the center of the rotating disk (11), an outer end of the connecting rod (12) being rotatably connected to one end of a supporting rod (13), and the other end of the supporting rod (13) being rotatably arranged at the back of a striking block (14).

3. The one-piece injection molding device for producing bag covers according to claim 2, characterized in that: The rotating disks (11) are symmetrically distributed in two groups about the center line of the fixed bracket (8), and the rotation speed and direction of the two groups of rotating disks (11) are set to be the same. The outer side of the knocking block (14) is close to the side wall position of the fixed mold (1).

4. The one-piece injection molding device for producing bag covers according to claim 1, characterized in that: The exhaust mechanism comprises a plurality of groups of fixing rods (15) fixed at the rear side of the knocking block (14); the outer sides of the fixing rods (15) are slidably arranged inside the accommodating tube (16); the rear end of the accommodating tube (16) is fixed to the surface of a support plate (17); and one side of the support plate (17) is fixed to one side of the fixing bracket (8); a one-way air supply pipe (18) is connected to the rear side of the accommodating tube (16); a plurality of groups of the one-way air supply pipes (18) are connected to the end positions of a connecting tube (19); and the connecting tube (19) extends into the interior of the fixed mold (1) at an end position away from the one-way air supply pipe (18).

5. The one-piece injection molding device for producing bag covers according to claim 4, characterized in that: The outer end of the connecting pipe (19) and the exhaust port (21) are in the same horizontal plane, and one side of the connecting pipe (19) and the air stop valve (20) are in the same horizontal direction, and a one-way air inlet valve is provided on one side of the accommodation pipe (16).

6. The one-piece injection molding device for producing bag covers according to claim 1, characterized in that: The maximum distance that the top block (26) moves is greater than the distance from the lowest air vent (27) to the top of the top block (26), and the outer side of the top block (26) and the inner side of the fixed mold (1) are tightly fitted.

7. The one-piece injection molding device for producing bag covers according to claim 1, characterized in that: The injection molding process of the molding injection molding device is specifically as follows: S1: heating the plastic raw material and conveying it through the feeding port (5) to ensure that the fixed mold (1) and the movable mold (3) are closed; S2: Cooling the interior of the fixed mold (1) through the provided coolant delivery pipe (7), and starting the dual-axis motor (9) to operate, so as to realize the operation of the shaking mechanism, and ensure that the air stop valve (20) is in an open state. The operation of the shaking mechanism can realize the operation of the exhaust mechanism, and the exhaust gas inside the fixed mold (1) can be discharged through the exhaust port (21); S3: After cooling, the gas stop valve (20) can be closed to allow gas to be transported through the butt joint (22), thereby ensuring that the gas is transported to the demoulding mechanism, so that the ejector block (26) can be ejected, thereby facilitating demoulding.

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