A two-stage ejection injection mold

Abstract

The utility model relates to injection mold technical field especially relates to a secondary ejection injection mold, its technical scheme includes the top plate, the top plate bottom is connected with the former mould, the bottom of former mould is connected with the back mould, the former mould bottom is installed with the movable mould core, the back mould top is equipped with the fixed mould core with movable mould core cooperation forms the injection cavity, the both ends side wall of back mould width direction is installed with the connecting plate, another end of connecting plate is connected with the bottom plate. The utility model discloses through the design double -deck ejection mechanism, namely first top plate and second top plate and the first ejector pin and second ejector pin of separately arranging on it, carries out injection molding piece step -by -step ejection, after first ejector pin preliminary ejection injection molding piece, second ejector pin further completes the ejection action, ensures that injection molding piece is stable, complete and separates from injection cavity, improves injection molding piece stripping efficiency, avoids the damage of ejection position concentration to injection molding piece ejection, and secondary ejection structure helps to prolong the service life of mould core simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically a secondary ejection injection mold. Background Technology

[0002] In the field of injection molding, with the increasing complexity of product design and the improvement of material properties, higher requirements are placed on the ejection mechanism of injection molds.

[0003] While existing ejection structures for injection molds can meet basic production needs, they often struggle to guarantee uniformity and precision when dealing with complex and detailed injection molded parts. This can easily lead to deformation, warping, or damage of the injection molded parts during ejection, directly affecting product quality and performance. Furthermore, existing ejection structures are particularly difficult for injection molded parts with uneven wall thickness, easily causing stress concentration in thinner or weaker areas. This can result in whitening, cracking, or breakage of the injection molded parts. In addition, it can increase friction between the mold and the injection molded part, accelerating mold core wear, shortening mold life, and increasing production costs.

[0004] In view of this, we propose a two-stage ejection injection mold to solve the existing problems. Summary of the Invention

[0005] The purpose of this invention is to provide a secondary ejection injection mold to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a secondary ejection injection mold, comprising a top plate, a front mold connected to the bottom of the top plate, a rear mold connected to the bottom of the front mold, a moving mold core installed at the bottom of the front mold, a fixed mold core provided at the top of the rear mold to cooperate with the moving mold core to form an injection cavity, connecting plates installed on the two side walls of the rear mold in the width direction, a bottom plate connected to the other end of the connecting plate, a guide post provided between the rear mold and the bottom plate, a first top plate and a second top plate that can slide along the axial direction of the guide post being sequentially fitted on the guide post from bottom to top, a first ejector pin installed on the first top plate, a second ejector pin installed on the second top plate, the second ejector pin being fitted on the outer periphery of the first ejector pin and being able to slide relative to the first ejector pin, and the other ends of the first ejector pin and the second ejector pin extending into the injection cavity.

[0007] Preferably, the guide post is provided with a stop plate above the second top plate to restrict the movement of the second top plate.

[0008] Preferably, the guide post includes a first guide post and a second guide post, the diameter of the first guide post is larger than the diameter of the second guide post, a stepped surface is formed between the connecting ends of the first guide post and the second guide post, and the first top plate and the second top plate are respectively fitted onto the first guide post and the second guide post.

[0009] Preferably, the first top plate and the second top plate are respectively provided with guide holes whose diameters match the diameters of the first guide post and the second guide post, and the guide holes of the first top plate and the second top plate are each provided with a lubricating layer to reduce friction.

[0010] Preferably, the first top plate and the second top plate are respectively connected to a drive mechanism that drives the first top plate and the second top plate to move along the guide column.

[0011] Preferably, the second top plate includes a mounting plate and a locking plate. The mounting plate is provided with a fixing seat, and the fixing seat is provided with a slot for fixed connection with the second ejector pin. The locking plate is located at the bottom of the mounting plate, and a countersunk screw is provided at one end of the top of the locking plate. The other end of the countersunk screw passes through the locking plate and the mounting plate and is threadedly connected to the fixing plate.

[0012] Preferably, the top of the top plate is provided with a sprue sleeve, and the sprue sleeve is provided with a runner along the axial direction that passes through the top plate, the front mold and the moving mold core and communicates with the injection cavity.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model designs a double-layer ejection mechanism, namely a first ejector plate and a second ejector plate, and a first ejector pin and a second ejector pin respectively disposed on them, to eject the injection molded part in stages. After the first ejector pin initially ejects the injection molded part, the second ejector pin further completes the ejection action, ensuring that the injection molded part is smoothly and completely removed from the injection cavity, improving the demolding efficiency of the injection molded part, avoiding damage to the injection molded part during ejection due to concentrated ejection positions, and the secondary ejection structure also helps to extend the service life of the mold core. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 3 This is a partial schematic diagram of the secondary ejection structure of this utility model.

[0017] In the diagram: 1. Top plate; 2. Front mold; 3. Rear mold; 4. Stop plate; 5. First top plate; 6. Bottom plate; 7. Guide pillar; 71. First guide pillar; 72. Stepped surface; 73. Second guide pillar; 8. First ejector pin; 9. Connecting plate; 10. Second top plate; 1001. Mounting plate; 1002. Locking plate; 1003. Fixed seat; 11. Second ejector pin; 12. Fixed mold core; 13. Moving mold core; 14. Runner; 15. Sprue bushing. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Example

[0019] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention proposes a secondary ejection injection mold, including a top plate 1, a front mold 2 connected to the bottom of the top plate 1, a rear mold 3 connected to the bottom of the front mold 2, a moving mold core 13 installed at the bottom of the front mold 2, a fixed mold core 12 provided at the top of the rear mold 3 to cooperate with the moving mold core 13 to form an injection cavity, connecting plates 9 installed on the two side walls of the rear mold 3 in the width direction, and a bottom plate 6 connected to the other end of the connecting plates 9. The connecting plates 9 firmly connect the rear mold 3 and the bottom plate 6, enhancing the overall rigidity of the mold and making the mold more stable during injection and ejection. A guide post 7 is provided between the rear mold 3 and the bottom plate 6. A first top plate 5 and a second top plate 10 that can slide along the axial direction of the guide post 7 are sequentially mounted on the guide post 7 from bottom to top. A first ejector pin 8 is installed on the first top plate 5, and a second ejector pin 11 is installed on the second top plate 10. The second ejector pin 11 is mounted on the outer periphery of the first ejector pin 8 and can slide relative to the first ejector pin 8. The other ends of the first ejector pin 8 and the second ejector pin 11 extend into the injection cavity.

[0020] Furthermore, the guide column 7 is provided with a stop plate 4 above the second top plate 10 to restrict the movement of the second top plate 10.

[0021] Furthermore, the guide post 7 includes a first guide post 71 and a second guide post 73. The diameter of the first guide post 71 is larger than the diameter of the second guide post 73. A stepped surface 72 is formed between the connecting ends of the first guide post 71 and the second guide post 73. The first top plate 5 and the second top plate 10 are respectively fitted onto the first guide post 71 and the second guide post 73.

[0022] Furthermore, the first top plate 5 and the second top plate 10 are respectively provided with guide holes whose diameters match the diameters of the first guide post 71 and the second guide post 73, and the guide holes of the first top plate 5 and the second top plate 10 are provided with a lubricating layer to reduce friction, so as to ensure the smoothness of the first top plate 5 and the second top plate 10 during the sliding process and reduce wear caused by friction.

[0023] Furthermore, the first top plate 5 and the second top plate 10 are respectively connected to a drive mechanism that drives the first top plate 5 and the second top plate 10 to move along the guide column 7.

[0024] Furthermore, the second top plate 10 includes a mounting plate 1001 and a locking plate 1002. The mounting plate 1001 is provided with a fixing seat 1003, and the fixing seat 1003 is provided with a slot for fixed connection with the second ejector pin 11. The locking plate 1002 is located at the bottom of the mounting plate 1001. One end of the top of the locking plate 1002 is provided with a countersunk screw, and the other end of the countersunk screw passes through the locking plate 1002 and the mounting plate 1001 and is threadedly connected to the fixing plate.

[0025] Furthermore, the top of the top plate 1 is provided with a sprue sleeve 15, and the sprue sleeve 15 is provided with a runner 14 that passes through the top plate 1, the front mold 2 and the moving mold core 13 and communicates with the injection cavity along the axial direction.

[0026] The working principle of the secondary ejection injection mold based on Embodiment 1 is as follows: During injection molding, the secondary ejection injection mold is installed in the injection molding machine. The molten plastic passes through the injection molding machine and enters the injection cavity formed by the moving mold core 13 of the front mold 2 and the fixed mold core 12 of the rear mold 3 along the runner 14 through the sprue sleeve 15. The molten plastic cools and solidifies in the injection cavity to form the required injection molded part.

[0027] After injection molding is completed, the injection molding machine drives the top plate 1, front mold 2, and moving mold core 13 to move and separate from the rear mold 3, causing the moving mold core 13 to separate from the fixed mold core 12. At this time, the injection molded part is connected to the fixed mold core 12. The injection molding machine drives the drive mechanism connected to the first top plate 5 to work, driving the first top plate 5 to slide along the first guide post 71 of the guide post 7. The first ejector pin 8 on the first top plate 5 slides along the axis of the first guide post 71, so that the tip of the first ejector pin 8 passes through the fixed mold core 12 and contacts the injection molded part, and initially ejects the injection molded part from the injection cavity. At this time, the second top plate 10 is in a stationary state, located on the stepped surface 72, which limits the travel of the first top plate 5 sliding on the first guide post 71. When the first top plate 5 slides along the first guide post 71 and abuts against the bottom surface of the second top plate 10, that is, when the first ejector pin 8 ejects the injection molded part to... After reaching the limit position, the drive mechanism connected to the second top plate 10 starts to work, pushing the second top plate 10 to slide along the second guide post 73 of the guide post 7. The second top plate 10 drives the second ejector pin 11 to move. Since the second ejector pin 11 is fitted on the outer periphery of the first ejector pin 8 and can slide relative to it, the second ejector pin 11 will further eject the injection molded part, ensuring that the injection molded part is completely separated from the fixed mold core 12 and ejected from the injection cavity. The second guide post 73 is provided with a fixed stop plate 4. After the second top plate 10 abuts against the stop plate 4, it reaches the maximum stroke of the second top plate 10 and stops moving to prevent excessive ejection from damaging the injection molded part or the mold. After the injection molded part is completely ejected and removed, the drive mechanism will work in reverse, pulling the first top plate 5 and the second top plate 10 back to the initial position along the guide post 7, respectively, to prepare for the next injection cycle.

[0028] The above specific embodiments are merely several preferred embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A secondary ejection injection mold, comprising a top plate (1), a front mold (2) connected to the bottom of the top plate (1), a rear mold (3) connected to the bottom of the front mold (2), a moving mold core (13) installed at the bottom of the front mold (2), a fixed mold core (12) provided at the top of the rear mold (3) to cooperate with the moving mold core (13) to form an injection cavity, connecting plates (9) installed on the side walls at both ends of the rear mold (3) in the width direction, and a bottom plate (6) connected to the other end of the connecting plates (9), characterized in that: A guide post (7) is provided between the rear mold (3) and the base plate (6). A first top plate (5) and a second top plate (10) that can slide along the axial direction of the guide post (7) are sequentially mounted on the guide post (7) from bottom to top. A first ejector pin (8) is installed on the first top plate (5), and a second ejector pin (11) is installed on the second top plate (10). The second ejector pin (11) is mounted on the outer periphery of the first ejector pin (8) and can slide relative to the first ejector pin (8). The other ends of the first ejector pin (8) and the second ejector pin (11) extend into the injection cavity.

2. The secondary ejection injection mold according to claim 1, characterized in that: The guide post (7) is located above the second top plate (10) and is equipped with a stop plate (4) to restrict the movement of the second top plate (10).

3. The secondary ejection injection mold according to claim 2, characterized in that: The guide post (7) includes a first guide post (71) and a second guide post (73). The diameter of the first guide post (71) is larger than the diameter of the second guide post (73). A stepped surface (72) is formed between the connecting ends of the first guide post (71) and the second guide post (73). The first top plate (5) and the second top plate (10) are respectively fitted onto the first guide post (71) and the second guide post (73).

4. A secondary ejection injection mold according to claim 3, characterized in that: The first top plate (5) and the second top plate (10) are respectively provided with guide holes whose diameters match the diameters of the first guide post (71) and the second guide post (73), and the guide holes of the first top plate (5) and the second top plate (10) are provided with a lubricating layer to reduce friction.

5. A secondary ejection injection mold according to claim 4, characterized in that: The first top plate (5) and the second top plate (10) are respectively connected to a drive mechanism that drives the first top plate (5) and the second top plate (10) to move along the guide column (7).

6. A secondary ejection injection mold according to claim 5, characterized in that: The second top plate (10) includes a mounting plate (1001) and a locking plate (1002). The mounting plate (1001) is provided with a fixing seat (1003). The fixing seat (1003) is provided with a slot for fixed connection with the second ejector pin (11). The locking plate (1002) is located at the bottom of the mounting plate (1001). One end of the top of the locking plate (1002) is provided with a countersunk screw. The other end of the countersunk screw passes through the locking plate (1002) and the mounting plate (1001) and is threadedly connected to the fixing plate.

7. A secondary ejection injection mold according to claim 1, characterized in that: The top plate (1) is provided with a sprue sleeve (15) at its top end. The sprue sleeve (15) is provided with a flow channel (14) that passes through the top plate (1), the front mold (2) and the moving mold core (13) and communicates with the injection cavity along the axial direction.

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