A stripper structure of an injection mold

Abstract

This utility model relates to the field of injection molds and discloses a demolding structure for an injection mold, including a front mold and a rear mold. Two primary slide blocks and two secondary slide blocks are fixed to the four sides of the rear mold, with the two primary slide blocks symmetrically distributed along the transverse central axis of the rear mold. A primary demolding mechanism is provided on the opposite side of each of the two primary slide blocks, and a secondary demolding mechanism is provided within the cavities of each of the two secondary slide blocks. The primary demolding mechanism includes a hydraulic cylinder fixed to the opposite side of the two primary slide blocks. This utility model, through the provision of the primary demolding mechanism, allows the movement of the primary slide block, while the pressure block moves, causing the limiting protrusion to move downwards. This allows the locking block to move, enabling the two movable plates to move along with the locking block. The other ends of the two movable plates can then be removed from the grooves or protrusions on the workpiece, thus preventing the precision plastic parts from being stretched during demolding and ensuring the production quality of the workpiece.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and specifically to a demolding structure for an injection mold. Background Technology

[0002] Injection molds are important process equipment for producing various industrial products. They are tools for producing plastic products and for giving them a complete structure and precise dimensions. Injection molding is a processing method used for mass production of certain complex-shaped parts. Specifically, it refers to injecting molten plastic into the mold cavity under high pressure by an injection molding machine, and then cooling and solidifying it to obtain the molded product.

[0003] A search revealed Chinese patent CN209888055U, which discloses a plastic part mold that facilitates demolding. The mold includes a moving mold fixing plate, a partition plate, a push rod fixing plate, a push rod mounting plate, a first guide rod, a first hydraulic cylinder, a sliding block, a second hydraulic cylinder, a push rod, a second guide rod, a moving mold pad, a fixed mold fixing plate, a fixed mold mounting plate, a moving mold plate, a fixed mold plate, and a sprue sleeve. In use, the first hydraulic cylinder is activated, causing the push rod fixing plate and the push rod mounting plate to move towards the fixed mold mounting plate. This causes the push rod on the push rod mounting plate to push the fixed mold mounting plate upwards, disengaging the moving mold plate from the fixed mold plate. At this point, the second hydraulic cylinder is activated, causing the sliding block to slide within a groove in the push rod mounting plate. This causes the sliding block to slide the push rod, which then pushes the mold within the moving mold plate, disengaging the mold from the moving mold plate and completing the demolding process. This device facilitates mold demolding, improves work efficiency, and is easy for users to operate.

[0004] While the aforementioned utility model facilitates demolding of plastic parts, it is prone to stretching during overall demolding when manufacturing precision plastic parts with complex internal and external grooves or protrusions, leading to an increased defect rate. Therefore, it is not suitable for manufacturing such precision plastic parts. Based on this, a demolding structure for injection molds is proposed to solve the above problems. Utility Model Content

[0005] Based on the above description, this utility model provides a demolding structure for injection molds to solve the problem that when manufacturing precision plastic parts with complex internal and external grooves or protrusions, the parts are easily stretched during overall demolding, resulting in an increased defect rate.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a mold ejection structure for an injection mold, including a front mold and a rear mold; two No. 1 slider seats and two No. 2 slider seats are fixed on the four sides of the rear mold respectively, wherein the two No. 1 slider seats are symmetrically distributed along the transverse central axis of the rear mold, and a No. 1 ejection mechanism is provided on the opposite side of the two No. 1 slider seats, and a No. 2 ejection mechanism is provided in the inner cavity of the two No. 2 slider seats. The first mold ejection mechanism includes a hydraulic cylinder fixed on the opposite side of two first slider seats, a groove opened on the side of the rear mold facing the front mold, a first sliding block provided in the inner cavity of the groove, and a linkage component for moving one end of the mold out of the groove or protrusion on the part. The second mold ejection mechanism includes a second sliding block disposed in the inner cavity of the two second sliding blocks, an oblique hole opened on the second sliding block, an elongated hole opened in the inner bottom wall of the second sliding block, and an oblique guide rod disposed in the oblique hole and the elongated hole.

[0007] Through the above technical solution, the No. 1 demolding mechanism can move the limiting convex plate downwards by moving the pressure block while the No. 1 sliding block moves, thereby allowing the locking block to move. This allows the two movable plates to move with the locking block, and the other ends of the two movable plates to move out of the groove or protrusion structure on the workpiece, thereby preventing the precision plastic parts from being stretched during demolding and ensuring the production quality of the workpiece.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, both the first and second slider seats have stepped grooves on the side facing the rear mold, and the piston end of the oil cylinder passes through the first slider seat and extends into the inner cavity of the groove, where a T-shaped block is fixed.

[0010] The T-shaped block, as described above, facilitates the installation and fixation of the piston end of the hydraulic cylinder with the first sliding block.

[0011] Furthermore, the first sliding block is slidably connected to the groove, and a T-shaped groove is provided on the first sliding block, the size of the T-shaped block being adapted to the size of the inner cavity of the T-shaped groove.

[0012] The above technical solution involves inserting a T-shaped block on one side of the piston end of the hydraulic cylinder into a T-shaped groove, thereby moving the first sliding block within the groove and stepped groove as the piston end of the hydraulic cylinder moves.

[0013] Furthermore, the linkage component includes a long strip-shaped pressure block fixed to the lower surface of the first sliding block, an installation groove opened in the groove, a limiting protrusion set in the installation groove, a locking block set on the pressure block, two linkage blocks fixed on opposite sides of the two first sliding blocks, and two movable plates that are clamped to both sides of the locking block and set at an inclination. The other ends of the two movable plates pass through the linkage block and extend to the opposite side of the two linkage blocks.

[0014] Through the above technical solution, the linkage component enables the two movable plates to move out of the grooves or protrusions on the surface of the workpiece, thereby completing the demolding.

[0015] Furthermore, the limiting convex plate is provided with two protrusions, and the side of the card block facing the limiting convex plate is provided with a card slot corresponding to the two protrusions; The first sliding block has a snap-fit ​​hole that matches the size of the top of the card block.

[0016] Through the above technical solution, the cooperation between the limiting protrusion and the slot below the card block can restrict the movement of the card block.

[0017] Furthermore, one end of the inclined guide rod is fixed to the front mold, and the two first sliding blocks and the two second sliding blocks can form a closed-loop assembly.

[0018] With the above technical solution, the No. 2 mold ejection mechanism is designed so that when the front mold moves away from the rear mold, the movement of the front mold drives the two inclined guide rods to move synchronously. Thus, under the action of the two inclined guide rods, the two No. 2 sliding blocks move in opposite directions, which can expose the workpiece and facilitate unloading.

[0019] Furthermore, the cross-sectional shape of the two first sliding blocks and the two second sliding blocks is T-shaped, and positioning blocks are fixed on both sides of the stepped groove, with one end of the positioning block located on the upper surface of the two first sliding blocks and the two second sliding blocks.

[0020] With the above technical solution, one end of the positioning block is located above the first and second sliding blocks, which can limit the movement of the first and second sliding blocks, so that they can only move in a straight line.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. By setting the No. 1 demolding mechanism, the limit convex plate can move downward by moving the pressure block while the No. 1 sliding block moves, so that the clamping block can move. This allows the two movable plates to move with the clamping block, and the other end of the two movable plates can be moved out of the groove or protrusion structure on the workpiece, thereby avoiding the stretching of the precision plastic parts during demolding and ensuring the production quality of the workpiece. 2. The No. 2 mold ejection mechanism is designed so that when the front mold moves away from the rear mold, the movement of the front mold drives the two inclined guide rods to move synchronously. Thus, under the action of the two inclined guide rods, the two No. 2 sliding blocks move in opposite directions, which exposes the workpiece and facilitates unloading. Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure of the ejection structure of an injection mold provided for an embodiment of this utility model; Figure 2 This is a side view of the structure of the rear mold in an embodiment of the present invention; Figure 3This is an enlarged structural diagram of embodiment A of the present invention; Figure 4 This is a cross-sectional view of the card block structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the demolding mechanism in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the demolding mechanism in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the structure after mold opening in an embodiment of this utility model.

[0023] Attached reference numerals: 1. Front mold; 2. Rear mold; 3. Slider seat number one; 4. Slider seat number two; 5. No. 1 mold ejection mechanism; 51. Hydraulic cylinder; 52. Groove; 53. No. 1 sliding block; 54. Pressure block; 55. Mounting groove; 56. Limiting protrusion; 57. Locking block; 58. Linkage block; 59. Movable plate; 6. No. 2 mold release mechanism; 61. No. 2 sliding block; 62. Angled hole; 63. Long strip hole; 64. Angled guide rod. Detailed Implementation

[0024] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0026] Example: Reference Figure 1 It includes a front mold 1 and a rear mold 2; the rear mold 2 has two first slider seats 3 and two second slider seats 4 fixed on its four sides respectively. The two first slider seats 3 are symmetrically distributed along the transverse central axis of the rear mold 2. The two first slider seats 3 are provided with a first mold release mechanism 5 on the opposite side of each of the two first slider seats 3. The inner cavity of each of the two second slider seats 4 is provided with a second mold release mechanism 6.

[0027] Among them, stepped grooves are opened on the side of the first slider seat 3 and the second slider seat 4 facing the rear mold 2.

[0028] refer to Figure 2The first mold ejection mechanism 5 includes a hydraulic cylinder 51 fixed on the opposite side of the two first slider seats 3, a groove 52 opened on the side of the rear mold 2 facing the front mold 1, a first sliding block 53 provided in the inner cavity of the groove 52, and a linkage component for moving one end of the mold out of the groove or protrusion on the part.

[0029] The piston end of the hydraulic cylinder 51 passes through the first slider seat 3 and extends into the inner cavity of the groove 52, where a T-shaped block is fixed. The first sliding block 53 is slidably connected to the groove 52. A T-shaped groove is provided on the first sliding block 53. The size of the T-shaped block is adapted to the size of the inner cavity of the T-shaped groove. The T-shaped block fixed at one end of the piston end of the hydraulic cylinder 51 is inserted into the T-shaped groove, thus completing the fixation between the hydraulic cylinder 51 and the first sliding block 53. Therefore, the movement of the piston end of the hydraulic cylinder 51 can drive the horizontal movement of the first sliding block 53.

[0030] refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 The linkage components include a long strip-shaped pressure block 54 fixed to the lower surface of the first sliding block 53, a mounting groove 55 opened in the groove 52, a limiting protrusion 56 set in the mounting groove 55, a locking block 57 set on the pressure block 54, two linkage blocks 58 fixed on opposite sides of the two first sliding blocks 53, and two movable plates 59 inclinedly set on both sides of the locking block 57; the other end of the two movable plates 59 passes through the linkage block 58 and extends to opposite sides of the two linkage blocks 58.

[0031] The limiting convex plate 56 has two protrusions, and the locking block 57 has a locking groove corresponding to the two protrusions on the side facing the limiting convex plate 56; the first sliding block 53 has a locking hole that matches the top size of the locking block 57.

[0032] In use, the hydraulic cylinder 51 is activated, and the piston end of the hydraulic cylinder 51 shortens, causing the first sliding block 53 to move. The movement of the first sliding block 53 causes the pressure block 54 fixed to it to move, and also causes the linkage block 58 to move. When the linkage block 58 moves, the movable plate 59 is inclined, causing the movable plate 59 to move upward, so that one end of the movable plate 59 can be moved out of the groove or protrusion on the surface of the workpiece. After the pressure block 54 moves to a certain distance, it can press down the two protrusions on the limiting protrusion plate 56, so that the limiting protrusion plate 56 moves downward, causing the two slots under the locking block 57 to separate from the two protrusions. At the same time, when the locking hole on the first sliding block 53 moves to the locking block 57, it will drive the locking block 57 to move. The movement of the locking block 57 will drive the two movable plates 59 to move, so that the movable plate 59 can be removed from the workpiece, avoiding obstruction of the workpiece.

[0033] refer to Figure 7The second mold ejection mechanism 6 includes a second sliding block 61 disposed in the inner cavity of the two second sliding block seats 4, an oblique hole 62 opened on the second sliding block 61, an elongated hole 63 opened in the inner bottom wall of the second sliding block seat 4, and an oblique guide rod 64 disposed in the oblique hole 62 and the elongated hole 63.

[0034] One end of the inclined guide rod 64 is fixed to the front mold 1, and the two first sliding blocks 53 and the two second sliding blocks 61 can form a closed loop assembly, which can wrap the core inside, making it easier for the injection plastic to enter and cool and form, thus completing the manufacturing of the processed part.

[0035] In addition, the cross-sectional shape of the two first sliding blocks 53 and the two second sliding blocks 61 is T-shaped. Positioning blocks are fixed on both sides of the stepped groove. One end of the positioning block is located on the upper surface of the two first sliding blocks 53 and the two second sliding blocks 61. Setting the width of the positioning block to be greater than the width of the stepped groove can restrict the upper part of the first sliding block 53 and the second sliding block 61, thereby preventing the first sliding block 53 and the second sliding block 61 from moving in the vertical direction and only allowing them to move in a horizontal straight line.

[0036] In use, by moving the front mold 1 away from the rear mold 2, the movement of the front mold 1 drives the two inclined guide rods 64 fixed thereto to move. The movement of the inclined guide rods 64 causes the second sliding block 61 to slide in the second slider seat 4. The opposite movement of the two second sliding blocks 61 can separate them from the workpiece, and then cooperate with the first mold ejection mechanism 5 to complete the unloading process.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A demolding structure for an injection mold, comprising a front mold (1) and a rear mold (2); characterized in that The rear mold (2) has two No. 1 slider seats (3) and two No. 2 slider seats (4) fixed on its four sides respectively. The two No. 1 slider seats (3) are symmetrically distributed along the transverse central axis of the rear mold (2). The two No. 1 slider seats (3) are provided with a No. 1 mold release mechanism (5) on the opposite side of each of the two No. 1 slider seats (3). The inner cavity of each of the two No. 2 slider seats (4) is provided with a No. 2 mold release mechanism (6). The first mold ejection mechanism (5) includes a cylinder (51) fixed on the opposite side of the two first slider seats (3), a groove (52) opened on the side of the rear mold (2) facing the front mold (1), a first sliding block (53) provided in the inner cavity of the groove (52), and a linkage for moving one end of the mold out of the groove or protrusion on the part. The second mold release mechanism (6) includes a second sliding block (61) disposed in the inner cavity of the two second sliding block seats (4), an oblique hole (62) opened on the second sliding block (61), an elongated hole (63) opened in the inner bottom wall of the second sliding block seat (4), and an oblique guide rod (64) disposed in the oblique hole (62) and the elongated hole (63).

2. The ejection structure of an injection mold according to claim 1, wherein Both the first slider seat (3) and the second slider seat (4) have stepped grooves on the side facing the rear mold (2). The piston end of the oil cylinder (51) passes through the first slider seat (3) and extends into the inner cavity of the groove (52) and is fixed with a T-shaped block.

3. The ejection structure of an injection mold according to claim 2, wherein The first sliding block (53) is slidably connected to the groove (52), and a T-shaped groove is provided on the first sliding block (53). The size of the T-shaped block is adapted to the size of the inner cavity of the T-shaped groove.

4. The ejection structure of an injection mold according to claim 1, wherein The linkage components include a long strip-shaped pressure block (54) fixed on the lower surface of the first sliding block (53), an installation groove (55) opened in the groove (52), a limiting protrusion (56) set in the installation groove (55), a locking block (57) set on the pressure block (54), two linkage blocks (58) fixed on opposite sides of the two first sliding blocks (53), and two movable plates (59) clamped on both sides of the locking block (57) and inclined. The other end of the two movable plates (59) passes through the linkage block (58) and extends to the opposite side of the two linkage blocks (58).

5. The ejection structure of an injection mold according to claim 4, wherein The limiting protrusion (56) is provided with two protrusions, and the card block (57) has a card groove corresponding to the two protrusions on the side facing the limiting protrusion (56); The first sliding block (53) has a snap-fit ​​hole that matches the top size of the snap block (57).

6. The ejection structure of an injection mold according to claim 1, wherein One end of the inclined guide rod (64) is fixed to the front mold (1), and the two first sliding blocks (53) and the two second sliding blocks (61) can form a closed loop assembly.

7. The ejection structure of an injection mold according to claim 2, wherein The cross-sectional shape of the two first sliding blocks (53) and the two second sliding blocks (61) is T-shaped. Positioning blocks are fixed on both sides of the stepped groove. One end of the positioning block is located on the upper surface of the two first sliding blocks (53) and the two second sliding blocks (61).

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