Injection mold

Abstract

The utility model discloses an injection mold, it includes: fixed mode group, it includes fixed mould, movable mode group, it includes movable mould and pouring component, and pouring component includes base body and sets up the injection nozzle of base body, draw material mechanism, when closing mould, injection nozzle and the sprue on movable mould intercommunication, draw material mechanism includes draw material pin and blow -off assembly, when closing mould, draw material pin is in the state of extension, to make the tail of draw material pin go into the sprue, when opening mould, draw material pin is in the state of retraction, to make the tail of draw material pin separate with the residual glue head that draws out from the sprue, blow -off assembly and the movement state linkage configuration of draw material pin, make when draw material pin is in the state of retraction, inject the compressed gas flow to the separation of glue head and draw material pin, make the glue head that adheres to base body separate from base body. The above-mentioned injection mold, the separation and the fall of glue head are completed by the draw material pin and blow -off assembly of built -in mould cooperation, eliminate the period time that mechanical hand takes material action occupies, improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mold structure technology, and in particular to an injection mold. Background Technology

[0002] In the field of injection molding technology, plastic products such as terminal shells are typically manufactured using injection molding, and the injection mold is the core tool for realizing this process. In traditional injection molds, during the mold opening process, the sprue (i.e., waste material) formed at the gate is often pulled out along with the moving mold. Because the sprue adheres to the moving mold and cannot detach automatically, it usually requires a robotic arm or other manual assistance to remove or clean it. This operation not only adds extra steps but also significantly prolongs the injection molding cycle and reduces production efficiency. Furthermore, the intervention of robotic arms may increase equipment costs and maintenance difficulty, hindering the optimization of automated production lines.

[0003] To address these issues, the industry has tried various improvement solutions, such as optimizing the gate design or improving the demolding mechanism. However, these solutions often suffer from problems such as incomplete cleaning of the mold head, complex structure, or excessively high requirements for mold processing precision. Utility Model Content

[0004] The purpose of this invention is to provide an injection mold that can effectively shorten the injection cycle and simplify the glue head cleaning process in order to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides an injection mold, comprising: A fixed module, which includes a fixed mold; A movable module includes a movable mold adapted to the fixed mold and a casting assembly, the casting assembly including a base and an injection nozzle and a material pulling mechanism disposed on the base; When the mold is closed, the injection nozzle is connected to the gate on the moving mold to pour slurry into the mold cavity formed by the moving mold and the fixed mold; The material pulling mechanism includes a material pulling pin and an air blowing assembly. The tail diameter of the material pulling pin is smaller than the diameter of the gate. The material pulling pin has an extended state and a retracted state. When the mold is closed, the material pulling pin is in the extended state so that the tail of the material pulling pin penetrates into the gate. When the mold is opened, the pull pin is in a retracted state so that the tail of the pull pin is separated from the residual rubber head pulled out from the gate. The air blowing assembly is configured in conjunction with the movement state of the pull pin, so that when the pull pin is in the retracted state, compressed air is sprayed at the separation point between the rubber head and the pull pin, causing the rubber head attached to the substrate to detach from the substrate.

[0006] Preferably, the tail of the pull pin has a connecting post, the diameter of the end of the connecting post away from the head of the pull pin is larger than the diameter of the end near the head of the pull pin, so that the connecting post has a frustum-shaped structure.

[0007] Preferably, the air blowing assembly includes an air passage connected to an air source and a nozzle connected to the air passage disposed in the substrate. The nozzle is located in the region near the tail of the pull pin, and the nozzle is closed when the pull pin is extended and opened when it is retracted. When the nozzle is open, compressed air is sprayed toward the rubber head through the nozzle.

[0008] Preferably, the substrate includes a first plate, a second plate, a third plate, and a fourth plate arranged in a stacked manner, with the fourth plate close to the moving mold and the first plate away from the moving mold. The fourth plate is fixedly disposed on the bottom wall of the second plate, the third plate is located between the fourth plate and the second plate, and the first plate is fixedly connected to the third plate; The end of the injection nozzle connected to the feeding system is located in the feeding hole on the first plate, and the output end of the injection nozzle is located on the fourth plate. The air passage and the nozzle are disposed on the fourth plate; the head of the pull pin is connected to the third plate; when the mold is opened / closed, the third plate can move relative to the fourth plate by a limited displacement, so that the pull pin is in an extended state or a retracted state.

[0009] Preferably, the second plate has a groove, and the third plate is fitted into the groove.

[0010] Preferably, the fourth plate body is provided with a dark hole that extends laterally and communicates with the air passage. The fourth plate body is also provided with a first through hole that is perpendicular to the dark hole. The opening of the first through hole on the side of the fourth plate body facing the moving mold forms the nozzle. The pull pin is disposed in the first through hole.

[0011] Preferably, the moving mold includes a fifth plate and a moving mold body disposed on the fifth plate, and the fixed mold includes a base and a fixed mold body disposed on the base, wherein the moving mold body matches the fixed mold body.

[0012] Preferably, the movable module further includes a plurality of first countersunk guide rods, and the fifth plate is provided with a plurality of first countersunk holes respectively adapted to the countersunk ends of each of the first countersunk guide rods. The tail end of the first countersunk guide rod passes through the first countersunk hole and is located in the second plate. The first plate is provided with a second countersunk hole, and a first fastening pin is provided in the second countersunk hole. The first fastening pin includes a fastening section near the tail end and a guide section near the head end. The first fastening pin is fastened to the tail end of the first countersunk guide rod through the fastening section. Based on the guide section, the first plate can move relative to the second plate along the axial direction of the guide section.

[0013] Preferably, a second countersunk guide rod is further provided between the first plate, the second plate and the fifth plate, the countersunk end of the second countersunk guide rod is fixedly connected to the first plate, and the tail end of the second countersunk guide rod slides through the fifth plate; The base is provided with a first positioning hole corresponding to the first countersunk guide rod and a second positioning hole corresponding to the second countersunk guide rod. When the mold is closed, the countersunk head of the first countersunk guide rod enters the first positioning hole, and the tail end of the second countersunk guide rod enters the second positioning hole.

[0014] Preferably, the moving mold further includes a flow divider plate located on the fifth plate, the flow divider plate being provided with a flow guide groove and a plurality of gates located at different positions on the flow guide groove, each gate being connected to one of the feed holes on the moving mold body.

[0015] Compared with existing technologies, the injection mold provided by the above technical solution can automatically pull out and separate the injection head during the mold opening process by setting a pull pin and an air blowing component in the pull mechanism. Specifically, when the mold is closed, the pull pin extends and penetrates into the gate; when the mold is opened, the pull pin retracts to pull out the injection head, and then the air blowing component sprays compressed air to detach the injection head from the substrate. Thus, since the separation and detachment of the injection head are completed collaboratively by the pull pin and the air blowing component built into the mold, no manual or mechanical actions such as external robotic arms for grasping, positioning, and handling are required. This eliminates the cycle time occupied by robotic arm material handling, thereby shortening the single injection cycle time, increasing production speed and capacity, improving production efficiency, simplifying the equipment configuration of the production line, and reducing equipment complexity and related maintenance costs. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the injection mold in the embodiment of this utility model, which is in the mold-closed state.

[0017] Figure 2 This is a three-dimensional structural diagram of the injection mold in an embodiment of the present invention, wherein the casting component and the moving mold are in a separated state.

[0018] Figure 3 This is a three-dimensional structural diagram of the injection mold in the embodiment of this utility model, which is in the mold-open state.

[0019] Figure 4 This is a three-dimensional structural diagram of the fixing module of the injection mold in the embodiment of this utility model.

[0020] Figure 5 This is a plan view of the movable module of the injection mold in the embodiment of this utility model.

[0021] Figure 6 for Figure 5 Longitudinal cross-section of the moving mold.

[0022] Figure 7 This is an exploded view of the casting component in an embodiment of this utility model.

[0023] Figure 8 This is a three-dimensional structural diagram of the pull pin in the embodiment of this utility model.

[0024] Figure 9 This is a cross-sectional view of the fourth plate along the C1 direction in an embodiment of this utility model.

[0025] Figure 10 This is a cross-sectional view of the fourth plate along the C2 direction in an embodiment of the present invention, wherein the pull pin is in the extended state.

[0026] Figure 11 This is a cross-sectional view of the fourth plate along the C2 direction in an embodiment of the present invention, wherein the pull pin is in a retracted state.

[0027] Figure 12 This is a longitudinal cross-sectional view of the movable module in an embodiment of this utility model.

[0028] Figure 13 This is a three-dimensional structural diagram of the first fastening pin in an embodiment of this utility model.

[0029] Figure 14 This is a three-dimensional structural diagram of the moving model in an embodiment of this utility model.

[0030] Figure 15 This is a planar structural diagram of the diverter plate in an embodiment of this utility model.

[0031] Figure 16 This is a three-dimensional structural diagram of the rubber head in an embodiment of this utility model. Detailed Implementation

[0032] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0033] This embodiment discloses an injection mold for use in plastic injection molding processes. For example... Figures 1 to 3 The injection mold includes a fixed module A and a movable module B.

[0034] Among them, fixed module A includes fixed module 1.

[0035] like Figures 3 to 8 The movable module B includes a movable mold 2 and a casting component 3, wherein the movable mold 2 is adapted to the fixed mold 1, and the two form a sealed mold cavity when the mold is closed. The casting component 3 includes a base 30 and an injection nozzle 31 and a material pulling mechanism disposed on the base 30.

[0036] The injection nozzle 31 is connected to the gate 221 on the moving mold 2 and is used to pour molten slurry into the mold cavity when the mold is closed.

[0037] The material pulling mechanism includes a material pulling pin 320 and an air blowing assembly. The tail diameter of the material pulling pin 320 is smaller than the diameter of the gate 221. The material pulling pin 320 has an extended state and a retracted state. When the mold is closed, the material pulling pin 320 is in the extended state so that the tail of the material pulling pin 320 penetrates into the gate 221.

[0038] When the mold opens, the pull pin 320 is in a retracted state so that the tail of the pull pin 320 separates from the residual rubber head P pulled out from the gate 221.

[0039] The air blowing assembly is linked to the movement of the pull pin 320, so that when the pull pin 320 is in the retracted state, compressed air is sprayed at the separation point between the rubber head P and the pull pin 320, causing the rubber head P attached to the substrate 30 to detach from the substrate 30.

[0040] The working principle of the above-mentioned injection mold is as follows: In the mold-closed state, the pull pin 320 is in the extended state, such as... Figure 9 and Figure 10 The tail of the nozzle 31 extends deep into the gate 221 of the moving mold 2. At this time, the nozzle 31 injects molten slurry into the mold cavity through the gate 221. The slurry cools and solidifies in the mold cavity to form the product, and at the same time, the slurry in the gate 221 also solidifies to form a sprue P. Since the tail of the pull pin 320 is located inside the gate 221, the solidified sprue P will adhere to the area around the tail of the pull pin 320.

[0041] During the mold-opening process, the casting component 3 is far from the moving mold 2, such as... Figure 5 The tail of the pull pin 320 disengages from the gate 221, thereby pulling out the runner P inside the gate 221. Then, the pull pin 320 retracts, as... Figure 11 This causes the pull pin 320 to separate from the rubber head P.

[0042] Subsequently, the air blowing component is linked to the retraction state of the pull pin 320, and compressed air is sprayed towards the separation point between the rubber head P and the pull pin 320. The high-pressure airflow acts on the rubber head P, causing it to detach from the base 30 and fall off, thereby completing the automatic removal of the rubber head P.

[0043] It should be noted that during the mold opening process, the timing of the pull pin 320 moving from the extended state to the retracted state can occur either before the moving mold 2 separates from the fixed mold 1 or after the moving mold 2 separates from the fixed mold 1.

[0044] Therefore, it can be seen that since the separation and detachment of the rubber head P is completed by the pull pin 320 built into the mold and the air blowing component, there is no need for manual or mechanical actions such as external robotic arms to grasp, position and transport. This eliminates the cycle time occupied by the robotic arms to pick up materials, thereby shortening the single injection cycle time, increasing production speed and capacity, improving production efficiency, simplifying the equipment configuration of the production line, and reducing equipment complexity and related maintenance costs.

[0045] On the other hand, such as Figure 8 The tail of the pull pin 320 has a connecting post 3200. The diameter of the end of the connecting post 3200 away from the head of the pull pin 320 (i.e. the end near the inside of the gate 221) is larger than the diameter of the end near the head of the pull pin 320, so that the connecting post 3200 has a frustum-shaped structure.

[0046] Specifically, the frustum-shaped structure of the connecting post 3200 is characterized by a diameter that gradually increases from the end near the head of the pull pin 320 to the end away from the head, forming a frustum-shaped geometry.

[0047] The diameter of the frustum-shaped connecting post 3200 is designed to be smaller than the diameter of the gate 221, so as to ensure that the pull pin 320 can smoothly penetrate into the gate 221 when it is extended, without blocking the slurry from entering the gate 221.

[0048] Because the connecting post 3200 has a frustum-shaped structure, its larger diameter at the end furthest from the head increases the contact area and fitting effect with the adhesive head P, thereby enhancing the adhesion between the adhesive head P and the connecting post 3200. Simultaneously, the smaller diameter at the smaller end of the frustum-shaped structure (the end closest to the head) reduces the resistance between the connecting post 3200 and the adhesive head P during retraction, facilitating the disengagement of the connecting post 3200 from the adhesive head P.

[0049] On the other hand, such as Figures 9 to 11The air blowing assembly includes an air passage 3033 connected to an air source and disposed within the base 30, and a nozzle 3032 connected to the air passage 3033. The nozzle 3032 is located near the tail of the pull pin 320, and the nozzle 3032 is closed when the pull pin 320 is extended and opened when it is retracted. When the nozzle 3032 is open, compressed air is sprayed towards the nozzle P through the nozzle 3032.

[0050] Specifically, the air passage 3033 is a circular channel embedded inside the base 30, for example, with a diameter of 2 mm, and is connected to an external compressed air valve. The opening of the nozzle 3032 faces the tail of the pull pin 320.

[0051] When the pull pin 320 is extended, its cylindrical tail end blocks the nozzle 3032, forming a mechanical seal; when retracted, the tail end moves back to expose the nozzle 3032, forming an airflow channel. The compressed air pressure can be set from 0.5MPa to 1.0MPa, and the flow rate is approximately 0.2L / min to ensure sufficient impact on the nozzle P without affecting the surface of the substrate 30.

[0052] Based on this, the motion linkage of the air nozzle 3032 achieves timing control of airflow, avoiding unnecessary airflow leakage. The impact separation of the rubber head P is completed at the instant the pull pin 320 retracts, improving the reliability of rubber head P disengagement; since the airflow is only turned on when necessary, the energy consumption of the air source is reduced.

[0053] The nozzle 3032 can be circular, elliptical, or porous to accommodate different nozzle P sizes.

[0054] The air blowing assembly can be controlled by a solenoid valve or a proportional valve to achieve more precise flow and pressure regulation.

[0055] On the other hand, such as Figure 3 and Figure 7 The substrate 30 includes a first plate 300, a second plate 301, a third plate 302, and a fourth plate 303 arranged in a stacked manner. The fourth plate 303 is closer to the moving mold 2, and the first plate 300 is farther away from the moving mold 2.

[0056] The fourth plate 303 is fixedly disposed on the bottom wall of the second plate 301, and the third plate 302 is located between the fourth plate 303 and the second plate 301, and the first plate 300 and the third plate 302 are fixedly connected.

[0057] The end of the injection nozzle 31 connected to the feeding system is located in the feeding hole on the first plate 300, and the output end of the injection nozzle 31 is located on the fourth plate 303.

[0058] Air passage 3033 and nozzle 3032 are disposed on the fourth plate 303. The head of pull pin 320 is connected to the third plate 302. During mold opening / closing, as the movable module B moves, the third plate 302 can move relative to the fourth plate 303 by a limited displacement, so that the pull pin 320 is in an extended or retracted state.

[0059] The working principle of the casting component 3 in this embodiment is as follows: During mold closing, the drive mechanism, via the first plate 300, moves the second plate 301, the third plate 302, and the fourth plate 303 together toward the fixed mold 1 until the injection nozzle 31 on the fourth plate 303 reaches the position where it engages with the gate 221. During this process, the pull pin 320 is in the extended state. When the fourth plate 303 is in position, the tail of the pull pin 320 extends into the gate 221 on the moving mold 2.

[0060] During mold opening, there are two strokes. In the first stroke, the drive mechanism, via the first plate 300, moves the second plate 301, the third plate 302, and the third plate 302 together in a direction away from the fixed mold 1. When it reaches the limit position of the first stroke, the second plate 301 can no longer move. Then the second stroke begins, that is, the first plate 300 moves the third plate 302 by a limited displacement, causing a relative displacement between the third plate 302 and the fourth plate 303. Based on this relative displacement, the third plate 302 pulls the pull pin 320, thereby causing the pull pin 320 to change from an extended state to a retracted state.

[0061] Through the specific structure of the casting component 3 in this embodiment, the state change of the pulling pin 320 adapts to the mold opening / closing action of the casting component 3, effectively improving the operating efficiency.

[0062] Furthermore, a groove 3010 is provided in the second plate 301, and the third plate 302 is embedded in the groove 3010.

[0063] On the other hand, please refer to again Figure 10 and Figure 11 The fourth plate 303 is provided with a dark hole 3030 that extends laterally and communicates with the air passage 3033. The fourth plate 303 is also provided with a first through hole 3031 that is perpendicular to the dark hole 3030. The opening of the first through hole 3031 on the side of the fourth plate 303 facing the moving mold 2 forms a nozzle 3032. The pull pin 320 is provided in the first through hole 3031.

[0064] In this embodiment, the concealed hole 3030 and the first through hole 3031 intersect internally to form a cross-shaped passage. The airflow enters the concealed hole 3030 from the air passage 3033, then enters the first through hole 3031 and is released at the nozzle 3032. The pull pin 320 is embedded in the first through hole 3031, blocking the nozzle 3032 when it extends, and being exposed when it retracts.

[0065] Therefore, the hidden hole 3030 and the intersecting first through hole 3031 effectively prevent external impurities from entering the air passage. The nozzle 3032 is located on the surface of the fourth plate 303, facilitating direct airflow onto the glue head P. The coaxial arrangement of the pull pin 320 and the nozzle 3032 ensures the precise impact direction of the airflow; the overall structure reduces the space required for external piping and improves the compactness of the mold.

[0066] On the other hand, such as Figure 5 , Figure 6 and Figure 14 The moving mold 2 includes a fifth plate 20 and a moving mold body 21 disposed on the fifth plate 20. For example... Figure 4 The fixed mold 1 includes a base 10 and a fixed mold body 11 disposed on the base 10, and the moving mold body 21 is matched with the fixed mold body 11.

[0067] Based on this, such as Figure 12 and Figure 13 The movable module B also includes several first countersunk guide rods 33. The fifth plate 20 is provided with several first countersunk holes 200 that are adapted to the countersunk ends of each first countersunk guide rod 33. The tail end of the first countersunk guide rod 33 passes through the first countersunk hole 200 and is located in the second plate 301. The first plate 300 is provided with a second countersunk hole 3000. A first fastening pin 34 is provided in the second countersunk hole 3000. The first fastening pin 34 includes a fastening section 340 near the tail and a guide section 341 near the head. The first fastening pin 34 is fastened to the tail end of the first countersunk guide rod 33 through the fastening section 340. Based on the guide section 341, the first plate 300 can move relative to the second plate 301 along the axial direction of the guide section 341.

[0068] In this embodiment, the first fastening pin 34 is preferably a plug screw.

[0069] When the mold is closed, the first plate 300 drives the second plate 301 to move along the first direction F1 in the figure. The first plate 300 and the second plate 301 are in contact with each other. The countersunk end of the first countersunk guide rod 33 exits the first countersunk hole 200. At this time, there is a space K between the head of the first fastening pin 34 and the bottom wall of the second countersunk hole 3000. Part of the guide section 341 of the first fastening pin 34 is located in the space K.

[0070] During the mold opening process, when the first plate 300 moves along the second direction F2 in the figure, and during the first stroke, the first plate 300 applies a pulling force to the second plate 301, the third plate 302 and the fourth plate 303. At this time, since the rubber head P is attached to the tail of the pull pin 320, although the head of the pull pin 320 is subjected to the pulling force of the third plate 302, the pulling force is relatively small because the first countersunk guide rod 33 slides freely in the first countersunk hole 200. It is not enough to pull the pull pin 320 to the retracted state. Therefore, there is still a space K between the head of the first fastening pin 34 and the second countersunk hole 3000.

[0071] When the countersunk end of the first countersunk guide rod 33 abuts against the first countersunk hole 200 and cannot continue to move in the second direction F2, it enters the second stroke. At this time, since the second plate 301 is fastened between the first countersunk guide rod 33 and the first fastening pin 34, the second plate 301 cannot continue to move. As the pulling force applied to the first plate 300 by the drive mechanism gradually increases (it should be noted that the first plate 300 and the third plate 302 are fixedly connected), it overcomes the obstruction of the rubber head P on the pull pin 320, causing the first plate 300 to move along the guide section 341 of the first fastening pin 34 until the bottom wall of the second countersunk hole 3000 abuts against the head of the first fastening pin 34, the second stroke reaches its limit position, and at this time, the pull pin 320 enters the retracted state.

[0072] Therefore, it can be seen that by combining the first countersunk guide rod 33 and the first fastening pin 34, the restricted displacement of the casting component 3 in the axial direction can be realized, thus meeting the expansion and contraction requirements of the pulling pin 320.

[0073] On the other hand, such as Figure 3 , Figure 4 and Figure 7 A second countersunk guide rod 35 is also provided between the first plate 300, the second plate 301 and the fifth plate 20. The countersunk end of the second countersunk guide rod 35 is fixedly connected to the first plate 301, and the tail end of the second countersunk guide rod 35 slides through the fifth plate 20.

[0074] The base 10 is provided with a first positioning hole 100 corresponding to the first countersunk guide rod 33 and a second positioning hole 101 corresponding to the second countersunk guide rod 35. When the mold is closed, the head of the first countersunk guide rod 33 enters the first positioning hole 100 and the tail of the second countersunk guide rod 35 enters the second positioning hole 101.

[0075] In this embodiment, the first countersunk guide rod 33 and the first positioning hole 100, and the second countersunk guide rod 35 and the second positioning hole 101 cooperate to realize the double guide rod double positioning structure. This double positioning structure provides multi-point constraints for the upper and lower molds, which significantly improves the rigidity and positioning accuracy during the mold closing process.

[0076] On the other hand, such as Figure 15 The moving mold 2 also includes a manifold 22 located on the fifth plate 20. The manifold 22 is provided with a guide channel 220 and a number of gates 221 located at different positions on the guide channel 220. Each gate 221 is connected to one of the feed holes 210 on the moving mold body 21 (e.g., Figure 14 Connect.

[0077] The manifold 22's flow channel 220 is combined with multiple gates 221 to adapt to a multi-mold cavity structure, allowing multiple products to be injection molded at once, for example, eight terminal shells to be injection molded at once.

[0078] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. An injection mold, characterized in that, include: A fixed module, which includes a fixed mold; A movable module includes a movable mold adapted to the fixed mold and a casting assembly, the casting assembly including a base and an injection nozzle and a material pulling mechanism disposed on the base; When the mold is closed, the injection nozzle is connected to the gate on the moving mold to pour slurry into the mold cavity formed by the moving mold and the fixed mold; The material pulling mechanism includes a material pulling pin and an air blowing assembly. The tail diameter of the material pulling pin is smaller than the diameter of the gate. The material pulling pin has an extended state and a retracted state. When the mold is closed, the material pulling pin is in the extended state so that the tail of the material pulling pin penetrates into the gate. When the mold is opened, the pull pin is in a retracted state so that the tail of the pull pin is separated from the residual rubber head pulled out from the gate. The air blowing assembly is configured in conjunction with the movement state of the pull pin, so that when the pull pin is in the retracted state, compressed air is sprayed at the separation point between the rubber head and the pull pin, causing the rubber head attached to the substrate to detach from the substrate.

2. The injection mold according to claim 1, characterized in that, The tail of the pull pin has a connecting post, and the diameter of the end of the connecting post away from the head of the pull pin is larger than the diameter of the end near the head of the pull pin, so that the connecting post has a frustum-shaped structure.

3. The injection mold according to claim 1, characterized in that, The air blowing assembly includes an air passage connected to an air source and a nozzle connected to the air passage disposed in the substrate. The nozzle is located in the region near the tail of the pull pin, and the nozzle is closed when the pull pin is extended and opened when it is retracted. When the nozzle is open, compressed air is sprayed toward the rubber head through the nozzle.

4. The injection mold according to claim 3, characterized in that, The substrate includes a first plate, a second plate, a third plate, and a fourth plate arranged in a stacked manner, with the fourth plate close to the moving mold and the first plate away from the moving mold. The fourth plate is fixedly disposed on the bottom wall of the second plate, the third plate is located between the fourth plate and the second plate, and the first plate is fixedly connected to the third plate; The end of the injection nozzle connected to the feeding system is located in the feeding hole on the first plate, and the output end of the injection nozzle is located on the fourth plate. The air passage and the nozzle are disposed on the fourth plate; the head of the pull pin is connected to the third plate; when the mold is opened / closed, the third plate can move relative to the fourth plate by a limited displacement, so that the pull pin is in an extended state or a retracted state.

5. The injection mold according to claim 4, characterized in that, The second plate has a groove, and the third plate is fitted into the groove.

6. The injection mold according to claim 4, characterized in that, The fourth plate is provided with a dark hole that extends laterally and communicates with the air passage. The fourth plate is also provided with a first through hole that is perpendicular to the dark hole. The opening of the first through hole on the side of the fourth plate facing the moving mold forms the nozzle. The pull pin is disposed in the first through hole.

7. The injection mold according to claim 4, characterized in that, The moving mold includes a fifth plate and a moving mold body disposed on the fifth plate, and the fixed mold includes a base and a fixed mold body disposed on the base, wherein the moving mold body is matched with the fixed mold body.

8. The injection mold according to claim 7, characterized in that, The movable module further includes a plurality of first countersunk guide rods. The fifth plate is provided with a plurality of first countersunk holes that are adapted to the countersunk ends of each of the first countersunk guide rods. The tail end of the first countersunk guide rod passes through the first countersunk hole and is located in the second plate. The first plate is provided with a second countersunk hole, and a first fastening pin is provided in the second countersunk hole. The first fastening pin includes a fastening section near the tail end and a guide section near the head end. The first fastening pin is fastened to the tail end of the first countersunk guide rod through the fastening section. Based on the guide section, the first plate can move relative to the second plate along the axial direction of the guide section.

9. The injection mold according to claim 8, characterized in that, A second countersunk guide rod is also provided between the first plate, the second plate and the fifth plate. The countersunk end of the second countersunk guide rod is fixedly connected to the first plate, and the tail end of the second countersunk guide rod slides through the fifth plate. The base is provided with a first positioning hole corresponding to the first countersunk guide rod and a second positioning hole corresponding to the second countersunk guide rod. When the mold is closed, the countersunk head of the first countersunk guide rod enters the first positioning hole, and the tail end of the second countersunk guide rod enters the second positioning hole.

10. The injection mold according to claim 7, characterized in that, The moving mold also includes a flow divider plate located on the fifth plate. The flow divider plate is provided with a flow guide groove and a number of gates located at different positions on the flow guide groove. Each gate is connected to one of the feed holes on the moving mold body.

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