Exhaust structure of injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to an exhaust structure of an injection mold, which comprises a static mold and a movable mold, and the interiors of the static mold and the movable mold are hollow. The utility model has the advantages that the barrier strip, the linkage rod and the plurality of sealing plugs are respectively arranged in the stepped mounting groove, the top end of the linkage rod is provided with the connecting rod, the top ends of the linkage rod and the connecting rod are connected with the electric push rod through the cross rod, the side surface of the linkage rod is provided with the limiting groove, and the side surfaces of the plurality of sealing plugs are provided with the limiting pins which are in sliding connection with the limiting groove. Through the extension action of an electric push rod, two linkage rods are driven to move upwards, a limiting pin slides along a limiting groove, a sealing plug moves in the direction of a barrier strip, the interior of a stepped mounting groove communicates with a mold cavity in a second mold core, air in the mold cavity is conveniently exhausted in time in the injection molding stage, and therefore injection molding machining is completed; and the injection molding quality of the injection molded part is stabilized, so that the problems in the prior art are effectively solved.

Description

Technical Field

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

[0002] An injection mold is a specialized tool used in the plastic injection molding process, primarily for manufacturing plastic products of various shapes and sizes. It consists of a high-precision mold and a mold support. Molten plastic material is heated and injected into the mold cavity, where it cools and solidifies to form the desired plastic product.

[0003] Currently, when using injection molds for injection molding, the high-temperature and high-pressure gases inside the mold are usually released manually by opening the vent pipe. This greatly increases the workload, and when workers make mistakes, the high-temperature and high-pressure gases inside can damage the molded parts, significantly reducing their quality and failing to meet usage requirements. Therefore, a venting structure for injection molds is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a venting structure for injection molds, which effectively solves the deficiencies of the prior art.

[0005] To achieve the above objectives, one embodiment of this utility model provides a venting structure for an injection mold, including a stationary mold and a moving mold. The stationary and moving molds are hollowed out, and a first mold core and a second mold core are respectively installed inside each. The second mold core has symmetrically arranged stepped mounting grooves on both sides, and both have baffles installed inside to seal them. Multiple limiting seats are installed on adjacent sides of the two baffles. Multiple vent holes are formed on the sidewalls of the two stepped mounting grooves. First through grooves are symmetrically formed on the outer walls of the multiple vent holes. Sealing plugs are movably installed inside each of the multiple vent holes, and the other side of each sealing plug slides against a limiting seat. The connection includes multiple sealing blocks with limit pins installed on their sides, two stepped mounting slots with linkage rods installed inside, and multiple upwardly inclined limit slots on the sides of the linkage rods, which are slidably connected to the limit pins. The top walls of the two stepped mounting slots have connecting holes that penetrate the second mold core and the moving mold. The inner walls of the two connecting holes have symmetrically arranged second through slots. Connecting rods are slidably installed inside the two connecting holes, and their bottom ends are threaded to the top ends of the two linkage rods. An electric push rod is installed on the top surface of the moving mold, and a crossbar is installed at its output end. The two ends of the crossbar are fixedly connected to the top ends of the connecting rods.

[0006] Preferably, the sides of the two baffles are flush with the sides of the second mold core, and both ends of the two baffles are fixedly connected to the inner wall of the stepped mounting groove by screws. This method facilitates the sealing of the two stepped mounting grooves. After the screws are unscrewed, the baffles can be easily removed, making it convenient to replace and maintain the linkage rod, sealing plug, etc.

[0007] Preferably, the end faces of the plurality of limiting seats are U-shaped, and one side of the plurality of limiting seats is in contact with the side wall of the stepped mounting groove. This method facilitates the limiting of the tail end position of the plurality of sealing plugs, while the head end of the sealing plug slides with the vent hole. Thus, under the drive of the linkage rod, the sealing plug can slide stably horizontally, thereby realizing the connection and sealing of the vent hole.

[0008] Preferably, in any of the above solutions, the shape of the multiple sealing plugs at the ends away from the baffle is stepped, and one end face of the multiple sealing plugs is flush with the inner wall of the mold cavity of the second mold core. The stepped structure of the multiple sealing plugs in this solution limits the position of the sealing plugs when the sealing plugs move horizontally, preventing the sealing plugs from excessively entering the inner wall of the mold cavity, thereby avoiding affecting the shape of the injection molded part.

[0009] Preferably, one side of each of the two linkage rods is abutted against the side wall of the stepped mounting groove, and a spring is installed between the top of each of the two linkage rods and the top wall of the stepped mounting groove. This design allows the springs to be compressed when the linkage rods rise, accumulating elastic potential energy. After the electric push rod shortens, it facilitates the auxiliary push of the linkage rod, causing the limiting pin to slide along the inside of the limiting groove and push the sealing plug to seal the vent hole.

[0010] Preferably, the top ends of both connecting rods are fixedly connected to both ends of the crossbar by screws. This design allows for a detachable structure between the connecting rods and the crossbar, facilitating threaded connection between the bottom end of the connecting rod and the top end of the linkage rod through the connecting hole when they are not connected. This makes it convenient for operators to perform initial installation and subsequent disassembly and maintenance of the linkage rod.

[0011] This utility model has the following advantages:

[0012] 1. The venting structure of this injection mold, by setting a second mold core, has stepped mounting grooves on both sides. Inside each stepped mounting groove are a stop bar, a linkage rod, and multiple sealing plugs. Each linkage rod has a connecting rod at its top, and the tops of both are connected to an electric push rod via a crossbar. Limit grooves are formed on the sides of the linkage rods, and limit pins are installed on the sides of the multiple sealing plugs, slidingly connected to the limit grooves. When the electric push rod extends, it drives the two linkage rods upwards, and the limit pins slide along the limit grooves, causing the sealing plugs to move towards the stop bar. This connects the interior of the stepped mounting grooves with the mold cavity inside the second mold core, facilitating timely venting of air from the mold cavity during the injection molding stage, thereby completing the injection molding process and stabilizing the injection quality of the molded parts, effectively solving the problems existing in the prior art.

[0013] 2. The venting structure of this injection mold, by setting a second mold core, has stepped mounting grooves symmetrically opened on its side, and baffles are installed inside. The baffles facilitate the sealing of the stepped mounting grooves, and limit seats are installed on one side of each baffle to limit the horizontal sliding of multiple sealing plugs, ensuring the precision of the fit. At the same time, mechanical control is adopted, making the overall operation more stable. By setting two springs, when the electric push rod shortens its movement, it assists the two linkage rods to move downward, so that the sealing plugs can quickly seal the vent holes and ensure the molding of the injection molded parts. Attached Figure Description

[0014] Figure 1 This is an exploded structural diagram of the moving and stationary molds of this utility model;

[0015] Figure 2 This is a first-view structural diagram of the moving model of this utility model;

[0016] Figure 3 This is a cross-sectional structural diagram of the moving mold of this utility model;

[0017] Figure 4 This is a schematic diagram of the second-view structure of the moving model of this utility model;

[0018] Figure 5 This is a partial cross-sectional view of the second mold core of this utility model;

[0019] Figure 6 This utility model Figure 5 Enlarged structural diagram at point A;

[0020] Figure 7 This is a schematic diagram showing the position and structure of the linkage rod and the stop bar of this utility model;

[0021] Figure 8 This is a schematic diagram of the explosive structure of the linkage rod and multiple sealing plugs of this utility model.

[0022] In the diagram: 1-Static mold, 2-Moving mold, 3-Connecting rod, 4-Horizontal bar, 5-Electric push rod, 6-Second mold core, 7-Step mounting groove, 8-Sealing plug, 9-Stop bar, 10-Spring, 11-Connecting hole, 12-Ventilation hole, 13-Linkage rod, 14-Limit pin, 15-Limit seat, 16-Limit groove, 17-First mold core, 18-First through groove, 19-Second through groove. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0024] like Figures 1 to 8 As shown, a venting structure for an injection mold includes a stationary mold 1 and a moving mold 2. The interiors of the stationary mold 1 and the moving mold 2 are hollowed out, and a first mold core 17 and a second mold core 6 are respectively installed inside each. The second mold core 6 has symmetrically arranged stepped mounting grooves 7 on both sides, and both have baffles 9 installed inside to seal them. Multiple limiting seats 15 are installed on adjacent sides of the two baffles 9. Multiple vent holes 12 are opened on the sidewalls of the two stepped mounting grooves 7. First through grooves 18 are symmetrically opened on the outer walls of the multiple vent holes 12. Sealing plugs 8 are movably installed inside the multiple vent holes 12. The other side of the multiple sealing plugs 8 is slidably connected to the limiting seats 15. Each of the two stepped mounting slots 7 is equipped with a limiting pin 14. Each of the two stepped mounting slots 7 is equipped with a linkage rod 13. The sides of the two linkage rods 13 are provided with multiple inclined upward limiting slots 16, which are slidably connected to the multiple limiting pins 14. The top walls of the two stepped mounting slots 7 are provided with connecting holes 11 that penetrate the second mold core 6 and the moving mold 2. The inner walls of the two connecting holes 11 are provided with symmetrically arranged second through slots 19. The connecting rods 3 are slidably installed inside the two connecting holes 11, and their bottom ends are threadedly connected to the top ends of the two linkage rods 13. An electric push rod 5 is installed on the top surface of the moving mold 2, and a crossbar 4 is installed at its output end. The two ends of the crossbar 4 are fixedly connected to the top ends of the connecting rods 3.

[0025] The sides of the two baffles 9 are flush with the sides of the second mold core 6. Both ends of the two baffles 9 are fixedly connected to the inner wall of the stepped mounting groove 7 by screws. As an optional technical solution of this utility model, this makes it easy to seal the two stepped mounting grooves 7. After the screws are unscrewed, the baffles 9 can be easily removed, making it convenient to replace and maintain the linkage rod 13, the sealing plug 8, etc.

[0026] The end faces of the multiple limiting seats 15 are U-shaped, and one side of the multiple limiting seats 15 is in contact with the side wall of the stepped mounting groove 7. As an optional technical solution of this utility model, this facilitates the limiting of the tail end position of the multiple sealing plugs 8. At the same time, the head end of the sealing plug 8 slides with the vent hole 12. Then, under the drive of the linkage rod 13, the sealing plug 8 can slide horizontally stably, thereby realizing the connection and sealing of the vent hole 12.

[0027] The multiple sealing plugs 8 have a stepped shape at the end away from the stop strip 9. One end face of the multiple sealing plugs 8 is flush with the inner wall of the mold cavity of the second mold core 6. As an optional technical solution of this utility model, the stepped structure of the multiple sealing plugs 8 limits the position of the sealing plugs 8 when the sealing plugs 8 move horizontally, preventing the sealing plugs 8 from excessively entering the inner wall of the mold cavity, thereby avoiding affecting the shape of the injection molded part.

[0028] One side of each of the two linkage rods 13 is attached to the side wall of the stepped mounting groove 7. A spring 10 is installed between the top of each linkage rod 13 and the top wall of the stepped mounting groove 7. As an optional technical solution of this utility model, this makes it easy to compress the spring 10 when the linkage rod 13 rises, so that the spring 10 accumulates elastic potential energy. After the electric push rod 5 shortens, it is easy to push the auxiliary linkage rod 13, so that the limiting pin 14 slides along the inside of the limiting groove 16, and pushes the sealing plug 8 to seal the vent hole 12.

[0029] The top ends of both connecting rods 3 are fixedly connected to both ends of the crossbar 4 by screws. As an optional technical solution of this utility model, this makes it easy to adopt a detachable structure between the connecting rod 3 and the crossbar 4. When the two are not connected, it is convenient to make the bottom end of the connecting rod 3 pass through the connecting hole 11 and be threaded to the top end of the linkage rod 13. This makes it convenient for operators to perform the initial installation and subsequent disassembly and maintenance of the linkage rod 13.

[0030] The venting structure of this injection mold requires the following steps when in use:

[0031] 1) Before injection molding, the moving mold 2 moves, causing the first mold core 17 and the second mold core 6 to combine into a closed space;

[0032] 2) During injection molding, the electric push rod 5 extends, causing the two linkage rods 13 to move upward;

[0033] 3) The limiting pin 14 slides along the limiting groove 16, causing the sealing plug 8 to move towards the stop bar 9, so that the interior of the stepped mounting groove 7 is connected to the mold cavity inside the second mold core 6, facilitating the timely discharge of air.

[0034] 4) After the air is expelled, the electric push rod 5 shortens, the linkage rod 13 moves downward, and the limit pin 14 slides against the limit groove 16. This pushes the sealing plug 8 to seal the vent hole 12, completing the mold cavity, facilitating injection molding, and ensuring the quality of the injection molded parts.

[0035] In summary, during use, the second mold core 6 is equipped with stepped mounting grooves 7 on both sides. Inside each stepped mounting groove 7 are a stop bar 6, a linkage rod 13, and multiple sealing plugs 8. Each linkage rod 13 has a connecting rod 3 at its top, and both rods are connected to an electric push rod 5 via a crossbar 4. A limiting groove 16 is provided on the side of each linkage rod 13, and limiting pins 14 are installed on the sides of the multiple sealing plugs 8 and slidably connected to the limiting grooves 16. When the electric push rod 5 extends, it drives the two linkage rods 13 upwards, and the limiting pins 14 slide along the limiting grooves 16, causing the sealing plugs 8 to move towards the stop bar 9. This connects the interior of the stepped mounting groove 7 with the mold cavity inside the second mold core 6, facilitating the injection molding process. Air inside the cavity is promptly expelled, thus completing the injection molding process and stabilizing the injection quality of the molded part, effectively solving the problems existing in the prior art. Furthermore, by setting a second mold core 6, which has stepped mounting grooves 7 symmetrically opened on its side and has a stop bar 9 installed inside, the stop bar 9 can easily block the stepped mounting grooves 7. Limit seats 15 are installed on one side of the stop bar 9, which can limit the horizontal sliding of multiple sealing plugs 8 to ensure the accuracy of the fit. At the same time, mechanical control is adopted, and the overall operation is more stable. By setting two springs 10, while the electric push rod 5 shortens its action, it is used to assist the two linkage rods 13 to move downward, so that the sealing plugs 8 can quickly block the vent holes 12, ensuring the molding of the injection molded part.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A venting structure for an injection mold, characterized in that: The system includes a static mold (1) and a moving mold (2). The static mold (1) and the moving mold (2) are hollow inside, and a first mold core (17) and a second mold core (6) are respectively installed inside them. The second mold core (6) has symmetrically arranged stepped mounting grooves (7) on both sides, and both have baffles (9) installed inside to seal them. Multiple limit seats (15) are installed on the adjacent sides of the two baffles (9). Multiple vent holes (12) are opened on the side walls of the two stepped mounting grooves (7). The outer walls of the multiple vent holes (12) are symmetrically provided with first through grooves (18). Each of the multiple vent holes (12) has a sealing plug (8) movably installed inside. The other side of the multiple sealing plugs (8) is slidably connected to the limit seat (15). Limiting devices are installed on the sides of the multiple sealing plugs (8). Pin (14), the two stepped mounting slots (7) are equipped with linkage rods (13), the two linkage rods (13) have multiple inclined upward limiting slots (16) on their sides, which are slidably connected to multiple limiting pins (14), the top walls of the two stepped mounting slots (7) are provided with connecting holes (11) that penetrate the second mold core (6) and the moving mold (2), the inner walls of the two connecting holes (11) are provided with symmetrically arranged second through slots (19), the two connecting holes (11) are slidably installed with connecting rods (3) inside, and the bottom ends of the two are threadedly connected to the top ends of the two linkage rods (13), the top surface of the moving mold (2) is equipped with an electric push rod (5), and its output end is equipped with a crossbar (4), the two ends of the crossbar (4) are fixedly connected to the top ends of the connecting rod (3).

2. The venting structure of an injection mold according to claim 1, characterized in that: The sides of the two baffles (9) are flush with the sides of the second mold core (6), and both ends of the two baffles (9) are fixedly connected to the inner wall of the stepped mounting groove (7) by screws.

3. The venting structure of an injection mold according to claim 2, characterized in that: The end faces of the plurality of limiting seats (15) are U-shaped, and one side of the plurality of limiting seats (15) is in contact with the side wall of the stepped mounting groove (7).

4. The venting structure of an injection mold according to claim 3, characterized in that: The shape of the multiple sealing plugs (8) away from the baffle (9) is stepped, and one end face of the multiple sealing plugs (8) is flush with the inner wall of the mold cavity of the second mold core (6).

5. The venting structure of an injection mold according to claim 4, characterized in that: One side of each of the two linkage rods (13) is in contact with the side wall of the stepped mounting groove (7), and a spring (10) is installed between the top of each of the two linkage rods (13) and the top wall of the stepped mounting groove (7).

6. The venting structure of an injection mold according to claim 5, characterized in that: The top ends of both connecting rods (3) are fixedly connected to both ends of the crossbar (4) by screws.

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