Core pulling mechanism for injection mold

Abstract

The utility model provides a core-pulling mechanism for an injection mold, which relates to the technical field of injection molds and comprises a lower mold, an upper mold is arranged at the top end of the lower mold, forming cavities are arranged at opposite ends of the lower mold and the upper mold, and a product main body is arranged in each forming cavity; when the mold is closed, the second guide block can press the wedging block downwards, the wedging block is driven to move through the cooperation of the first guide block, so that the drawing needle is driven to penetrate through one side of the forming cavity, a hole is conveniently formed in a product main body, and after forming, the drawing needle moves under the reset thrust of the first spring only by moving the second guide block upwards, so that the drawing needle is separated from the forming cavity; according to the device, through the arrangement of the first spring, the drawing needle and the wedging block and the cooperation of the first guide block and the second guide block, the core-pulling effect can be achieved, and compared with traditional parts such as a sliding block base, a backhoe, an inclined guide column and a pressing strip, the structure is simple, the number of parts is small, and the cost of manual maintenance of spare parts and the like is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a core pulling mechanism for injection molds. Background Art

[0002] Injection molds often feature side holes, undercuts, or other complex lateral features. To smoothly remove the molded plastic product from the mold, a core-pulling mechanism is required. Traditional injection molds can face numerous challenges when handling these complex structures.

[0003] In the prior art, during the use of an existing core-pulling mechanism for an injection mold, a conventional core-pulling structure needs to add components such as a slider seat, a pressure strip, and an inclined guide column. The large size requires an increase in the inventory of wearing parts and the problem of breakage of the inclined guide column. In addition, the mechanisms that can be installed and disassembled are all fixed and installed by bolts. The bolt installation and disassembly method requires manual use of tools and slow rotation, which is time-consuming and labor-intensive, and has poor practicality. Utility Model Content

[0004] The utility model mainly provides a small-volume mechanism which is added in a lower mold and uses a spring to realize the retreat of the core pulling mechanism, and a core pulling mechanism for an injection mold which does not use bolts and can be quickly installed and disassembled.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a core pulling mechanism for an injection mold, comprising a lower mold, the top of the lower mold is provided with an upper mold, and the lower mold and the upper mold have opposite ends with a molding cavity, the molding cavity is provided with a product body, one end of the molding cavity is provided with an extraction needle, one end of the extraction needle passes through the molding cavity and is provided in the lower mold, the other end of the extraction needle is fixed with a baffle, a first spring is fixed between the baffle and the inner wall of the lower mold, the top of the lower mold is provided with a slot, a fixing plate is provided in the slot, the end of the baffle away from the extraction needle is located in the slot and a wedge block is fixed, a gap is left between the wedge block and the fixing plate, a first guide block is provided on the inner bottom wall of the slot on one side of the fixing plate, a second guide block is fixed at the bottom end of the upper mold, and a snap structure for installing and disassembling the fixing plate and the first guide block is provided in the lower mold.

[0006] Preferably, the snap structure includes a second inner cavity opened at one end of the lower mold, a movable plate is provided in the second inner cavity, one end of the movable plate is fixed with a clamping column, the clamping column passes through the fixed plate and the first guide block and is provided in the lower mold, and a second spring is fixed between the inner wall of the second inner cavity and the movable plate and located on the outer side of the clamping column. When the fixed plate and the first guide block need to be disassembled, the user only needs to pull the movable plate to drive the clamping column to separate from the first guide block and the fixed plate. At this time, the user can directly remove the fixed plate and the first guide block for quick disassembly. When installing, it is only necessary to place the fixed plate and the first guide block into the slot opened in the lower mold, loosen the movable plate, and the movable plate drives the clamping column to pass through the fixed plate and the first guide block under the return thrust of the second spring, thereby clamping and limiting it, thereby achieving the effect of quick installation and disassembly.

[0007] Preferably, connecting plates are fixed at both ends of the outer wall of the movable plate, and one end of the two connecting plates passes through the lower mold and is jointly fixed with a pull plate. Through the setting of the connecting plates and the pull plates, the displacement of the movable plate can be operated through the connecting plates and the pull plates. The user can directly pull the pull plate outside the lower mold to drive the movable plate to move, which is more convenient.

[0008] Preferably, a support plate is fixed on the outer wall of the lower mold, and a pin is provided in the support plate, and the bottom end of the pin passes through the pull plate, and a first hole matching the pin is provided in the pull plate, and a second hole matching the pin is provided in the movable plate. Through the setting of the pin and the first hole, when the clamping column passes through the fixed plate and the first guide block, the pull plate is below the support plate, and the pin can limit the position of the pull plate to avoid accidental shaking of the pull plate, and the stability is stronger. Through the setting of the second hole, when the movable plate moves out of the lower mold and the fixed plate and the first guide block are disassembled, the pin can limit the position of the movable plate, and the user does not need to pull the pull plate all the time, which is more convenient.

[0009] Preferably, a first inner cavity is opened in the lower mold at the bottom end of the molding cavity, a telescopic rod is installed on the inner bottom wall of the first inner cavity, and an ejector pin is fixed to the output end of the telescopic rod. The operation of the telescopic rod can drive the ejector pin to rise and fall, thereby facilitating the ejection of the product body in the molding cavity.

[0010] Preferably, the wedge block is arranged between the first guide block and the second guide block, and the opposite ends of the first guide block and the second guide block are provided with an oblique opening matching the wedge block. The wedge block is arranged between the first guide block and the second guide block. When the mold is closed, the second guide block presses down the wedge block, and through the cooperation of the first guide block, the wedge block is driven to move, thereby driving the extraction needle to penetrate one side of the molding cavity, which is convenient for the molding hole of the product main body. After molding, it is only necessary to move the second guide block upward, and the extraction needle moves under the reset thrust of the first spring, so that the extraction needle is separated from the molding cavity, which is convenient for the ejection of the product main body.

[0011] Compared with the prior art, the advantages and positive effects of the present invention are:

[0012] In the utility model, when the mold is closed, the second guide block presses down the wedge block, and the cooperation of the first guide block drives the wedge block to move, thereby driving the extraction needle to penetrate one side of the molding cavity, which is convenient for the molding hole of the product body. After molding, it is only necessary to move the second guide block upward, and the extraction needle moves under the reset thrust of the first spring, so that the extraction needle is separated from the molding cavity, which is convenient for the ejection of the product body. This device can achieve the effect of core pulling through the arrangement of the first spring, the extraction needle and the wedge block, and the cooperation of the first guide block and the second guide block. Compared with traditional slider seats, backhoes, inclined guide columns, pressure strips and other parts, this structure is simple. The device has fewer parts, reduces the cost of manual maintenance and spare parts, is easy to maintain, and is more practical. In addition, when the fixed plate and the first guide block need to be disassembled, the user only needs to pull the movable plate to drive the clamping column to separate from the first guide block and the fixed plate. At this time, the user can directly remove the fixed plate and the first guide block for quick disassembly. During installation, it is only necessary to place the fixed plate and the first guide block into the slots provided in the lower mold, loosen the movable plate, and the movable plate drives the clamping column to penetrate the fixed plate and the first guide block under the return thrust of the second spring, thereby clamping and limiting them, thereby achieving the effect of quick installation and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model provides a three-dimensional diagram of a core pulling mechanism for an injection mold;

[0014] Figure 2 The utility model provides a cross-sectional view of a core pulling mechanism for an injection mold;

[0015] Figure 3 The utility model provides a cross-sectional front view of a core pulling mechanism for an injection mold;

[0016] Figure 4 The utility model provides a schematic diagram of a buckle structure of a core pulling mechanism for an injection mold.

[0017] Legend: 1. Lower mold; 2. Upper mold; 3. Molding cavity; 4. Product body; 5. First inner cavity; 6. Telescopic rod; 7. Ejector pin; 8. Extractor pin; 9. Baffle; 10. First spring; 11. Tightening block; 12. Slot; 13. First guide block; 14. Second guide block; 15. Fixed plate; 16. Buckle structure; 1601. Second inner cavity; 1602. Movable plate; 1603. Clamping column; 1604. Second spring; 17. Connecting plate; 18. Pull plate; 19. Support plate; 20. Pin; 21. First socket; 22. Second socket. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] See also Figure 1 - Figure 4The utility model provides a technical solution: a core-pulling mechanism for an injection mold, comprising a lower mold 1, an upper mold 2 is provided at the top of the lower mold 1, a molding cavity 3 is provided at the opposite ends of the lower mold 1 and the upper mold 2, a product body 4 is provided in the molding cavity 3, an extraction needle 8 is provided at one end of the molding cavity 3, one end of the extraction needle 8 passes through the molding cavity 3 and is provided in the lower mold 1, a baffle 9 is fixed to the other end of the extraction needle 8, a first spring 10 is fixed between the baffle 9 and the inner wall of the lower mold 1, a slot 12 is provided at the top of the lower mold 1, a fixing plate 15 is provided in the slot 12, an end of the baffle 9 away from the extraction needle 8 is located in the slot 12 and a wedge block 11 is fixed, a gap is left between the wedge block 11 and the fixing plate 15, a first guide block 13 is provided on the inner bottom wall of the slot 12 on one side of the fixing plate 15, a second guide block 14 is fixed at the bottom end of the upper mold 2, and a When the mold is closed, the second guide block 14 will press the clamping block 11 downward, and the clamping block 11 will be driven to move by the cooperation of the first guide block 13, thereby driving the extraction needle 8 to penetrate one side of the molding cavity 3, which is convenient for the molding hole of the product body 4. After molding, it is only necessary to move the second guide block 14 upward, and the extraction needle 8 will move under the reset thrust of the first spring 10, so that the extraction needle 8 will be separated from the molding cavity 3, which is convenient for the ejection of the product body 4. This device can achieve the effect of core pulling through the arrangement of the first spring 10, the extraction needle 8 and the clamping block 11, and then through the cooperation of the first guide block 13 and the second guide block 14. Compared with traditional slider seats, backhoes, inclined guide columns, pressure strips and other parts, this structure is simple and has fewer parts, reduces the cost of manual maintenance parts and spare parts, is easy to maintain, and is more practical. Through the arrangement of the clamping structure 16, the fixing plate 15 and the first guide block 13 can be quickly installed and removed, which is simple and practical.

[0021] like Figure 1-4As shown, the snap-fit structure 16 includes a second inner cavity 1601 opened at one end of the lower mold 1, a movable plate 1602 is provided in the second inner cavity 1601, a clamping column 1603 is fixed at one end of the movable plate 1602, the clamping column 1603 passes through the fixed plate 15 and the first guide block 13 and is provided in the lower mold 1, and a second spring 1604 is fixed on the outer side of the clamping column 1603 between the inner wall of the second inner cavity 1601 and the movable plate 1602. When the fixed plate 15 and the first guide block 13 need to be disassembled, the user only needs to pull the movable plate 1602. 602, driving the clamping column 1603 to disengage from the first guide block 13 and the fixed plate 15. At this time, the user can directly remove the fixed plate 15 and the first guide block 13 for quick disassembly. During installation, it is only necessary to place the fixed plate 15 and the first guide block 13 into the slot 12 provided in the lower mold 1, loosen the movable plate 1602, and the movable plate 1602 drives the clamping column 1603 to penetrate the fixed plate 15 and the first guide block 13 under the reset thrust of the second spring 1604, thereby clamping and limiting them, thereby achieving the effect of quick installation and disassembly.

[0022] like Figure 1-4 As shown, connecting plates 17 are fixed at both ends of the outer wall of the movable plate 1602. One end of the two connecting plates 17 passes through the lower mold 1 and is jointly fixed with a pull plate 18. Through the setting of the connecting plates 17 and the pull plates 18, the displacement of the movable plate 1602 can be operated through the connecting plates 17 and the pull plates 18. The user can directly pull the pull plate 18 outside the lower mold 1 to drive the movable plate 1602 to move, which is more convenient.

[0023] like Figure 1-4 As shown, a support plate 19 is fixed on the outer wall of the lower mold 1, and a latch 20 is provided in the support plate 19. The bottom end of the latch 20 passes through the pull plate 18, and a first socket 21 matching the latch 20 is provided in the pull plate 18. A second socket 22 matching the latch 20 is provided in the movable plate 1602. Through the setting of the latch 20 and the first socket 21, when the clamping column 1603 passes through the fixed plate 15 and the first guide block 13, the pull plate 18 is below the support plate 19, and the latch 20 can limit the position of the pull plate 18 to avoid accidental shaking of the pull plate 18, and the stability is stronger. Through the setting of the second socket 22, when the movable plate 1602 is moved out of the lower mold 1, the fixed plate 15 and the first guide block 13 are disassembled, and the latch 20 can limit the position of the movable plate 1602. There is no need for the user to pull the pull plate 18 all the time, which is more convenient.

[0024] like Figure 1-4As shown, a first inner cavity 5 is opened at the bottom end of the molding cavity 3 in the lower mold 1, and a telescopic rod 6 is installed on the inner bottom wall of the first inner cavity 5. An ejector pin 7 is fixed to the output end of the telescopic rod 6. The operation of the telescopic rod 6 can drive the ejector pin 7 to rise and fall, thereby facilitating the ejection of the product body 4 in the molding cavity 3.

[0025] like Figure 1-4 As shown, the wedge block 11 is arranged between the first guide block 13 and the second guide block 14, and the opposite ends of the first guide block 13 and the second guide block 14 are provided with an oblique opening matching the wedge block 11. The wedge block 11 is arranged between the first guide block 13 and the second guide block 14. When the mold is closed, the second guide block 14 will press down the wedge block 11, and through the cooperation of the first guide block 13, the wedge block 11 is driven to move, thereby driving the extraction needle 8 to penetrate one side of the molding cavity 3, which is convenient for the molding hole of the product body 4. After molding, it is only necessary to move the second guide block 14 upward, and the extraction needle 8 moves under the reset thrust of the first spring 10, so that the extraction needle 8 is separated from the molding cavity 3, which is convenient for the ejection of the product body 4.

[0026] The use method and working principle of this device: When the device is used, when the mold is closed, the second guide block 14 will press the wedge block 11 downward, and through the cooperation of the first guide block 13, the wedge block 11 will be driven to move, thereby driving the extraction needle 8 to penetrate one side of the molding cavity 3, which is convenient for the product body 4 to form a hole. After molding, it is only necessary to move the second guide block 14 upward, and the extraction needle 8 will move under the reset thrust of the first spring 10, so that the extraction needle 8 is separated from the molding cavity 3, which is convenient for the ejection of the product body 4. This device can achieve the effect of core pulling through the arrangement of the first spring 10, the extraction needle 8 and the wedge block 11, and then through the cooperation of the first guide block 13 and the second guide block 14. When the fixed plate 15 and the first guide block 13 need to be disassembled, the user only needs to pull the movable plate 1602 to drive the clamping column 1603 to separate from the first guide block 13 and the fixed plate 15. At this time, the user can directly remove the fixed plate 15 and the first guide block 13 for quick disassembly. When installing, it is only necessary to place the fixed plate 15 and the first guide block 13 into the slot 12 opened in the lower mold 1, loosen the movable plate 1602, and the movable plate 1602 drives the clamping column 1603 to penetrate the fixed plate 15 and the first guide block 13 under the reset thrust of the second spring 1604, thereby clamping and limiting them, thereby achieving the effect of quick installation and disassembly.

[0027] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A core pulling mechanism for an injection mold, comprising a lower mold (1), characterized in that: The top of the lower mold (1) is provided with an upper mold (2), and the opposite ends of the lower mold (1) and the upper mold (2) are both provided with a molding cavity (3), and a product body (4) is provided in the molding cavity (3). One end of the molding cavity (3) is provided with a drawing needle (8), and one end of the drawing needle (8) passes through the molding cavity (3) and is provided in the lower mold (1). The other end of the drawing needle (8) is fixed with a baffle (9), and a first spring (10) is fixed between the baffle (9) and the inner wall of the lower mold (1) and on the outside of the drawing needle (8). The top of the lower mold (1) is provided with a A slot (12) is provided, wherein a fixing plate (15) is provided in the slot (12), a wedge block (11) is fixed in the slot (12) at one end of the baffle (9) away from the extraction needle (8), a gap is left between the wedge block (11) and the fixing plate (15), a first guide block (13) is provided on the inner bottom wall of the slot (12) on one side of the fixing plate (15), a second guide block (14) is fixed at the bottom end of the upper mold (2), and a snap-fit structure (16) for installing and disassembling the fixing plate (15) and the first guide block (13) is provided in the lower mold (1).

2. A core-pulling mechanism for an injection mold according to claim 1, characterized in that: The snap-fit structure (16) includes a second inner cavity (1601) opened at one end of the lower mold (1), a movable plate (1602) is provided in the second inner cavity (1601), a clamping column (1603) is fixed to one end of the movable plate (1602), the clamping column (1603) passes through the fixed plate (15) and the first guide block (13) and is provided in the lower mold (1), and a second spring (1604) is fixed between the inner wall of the second inner cavity (1601) and the movable plate (1602) and on the outside of the clamping column (1603).

3. A core-pulling mechanism for an injection mold according to claim 2, characterized in that: Connecting plates (17) are fixed to both ends of the outer wall of the movable plate (1602), and one end of the two connecting plates (17) passes through the lower mold (1) and is fixed to a pulling plate (18) together.

4. A core-pulling mechanism for an injection mold according to claim 3, characterized in that: A support plate (19) is fixed on the outer wall of the lower mold (1), a latch (20) is provided in the support plate (19), the bottom end of the latch (20) passes through the pull plate (18), a first socket (21) matching the latch (20) is provided in the pull plate (18), and a second socket (22) matching the latch (20) is provided in the movable plate (1602).

5. The core-pulling mechanism for an injection mold according to claim 1, characterized in that: A first inner cavity (5) is provided in the lower mold (1) at the bottom end of the molding cavity (3); a telescopic rod (6) is installed on the inner bottom wall of the first inner cavity (5); and a ejector pin (7) is fixed to the output end of the telescopic rod (6).

6. The core-pulling mechanism for an injection mold according to claim 1, characterized in that: The wedge block (11) is arranged between the first guide block (13) and the second guide block (14); opposite ends of the first guide block (13) and the second guide block (14) are both provided with oblique openings matching the wedge block (11).

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