Secondary core pulling structure and injection mold

Abstract

The secondary core pulling structure comprises a pulling block, a traction block, a first limiting rod and a plug pin, when the traction block moves in the direction away from the pulling block, the traction block is separated from the pulling block, the second end of the first limiting rod can abut against the side wall of the bottom of a second limiting cavity, and the second end of the first limiting rod can abut against the side wall of the bottom of the second limiting cavity. The distance between a limiting block inserting groove in the traction block and a plug pin is gradually shortened, the plug pin is aligned with the inserting groove, the plug pin slides into the inserting groove in a sliding hole under the action of gravity, the plug pin and the limiting block are stably connected, and therefore the traction block and the drawing block form a whole. And the displacement distance of the traction block can be limited through the first limiting rod, so that the plug pin can accurately enter the slot. And when the traction block moves again, the traction block can drive the pulling block to move synchronously, so that the secondary core pulling process is smoothly completed.

Description

Technical Field

[0001] The utility model relates to the technical field of mold design, and particularly relates to a secondary core-pulling structure and an injection mold. Background Art

[0002] After the injection molding process of the molds on the market is completed, it is necessary to demold the cooled and formed workpieces. For some workpieces with undercut structures, in order to ensure the integrity of the workpieces, the demolding process needs to be completed through secondary core-pulling.

[0003] The secondary core-pulling structures on the market are composed of a pulling block and a sliding block. The sliding block and the pulling block are connected by a spring. First, the sliding block is driven by an external force to move away from the workpiece. The insert on the sliding block is disengaged from the undercut structure of the workpiece as the sliding block moves, completing the first core-pulling. At this time, the spring is stretched to its maximum length. Then, the sliding block is driven again to move away from the workpiece. Under the traction of the spring, the pulling block moves along with the sliding block, and the pulling block is separated from the workpiece, completing the second core-pulling.

[0004] However, during the secondary core-pulling process, as the number of uses increases, the spring will gradually fatigue, resulting in a decrease or failure of its elastic force, making the sliding block unable to move together with the pulling block, causing the sliding block and the pulling block to fail to reach the preset positions and resulting in the failure of the secondary core-pulling, seriously affecting the accuracy and effect of the core-pulling. Summary of the Utility Model

[0005] Based on this, it is necessary to provide a secondary core-pulling structure.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A secondary core-pulling structure includes:

[0008] A pulling block, on which a receiving cavity is formed, and a sliding hole is formed on the side wall of the receiving cavity;

[0009] A traction block, which moves in the direction of approaching or departing from the pulling block. The first end of the traction block is in movable contact with the pulling block. A first limiting cavity is formed at the first end of the traction block, a second limiting cavity is formed at the second end of the traction block, the second limiting cavity is in communication with the first limiting cavity, the width of the second limiting cavity is greater than that of the first limiting cavity, a limiting block is arranged at the first end of the traction block, the limiting block is movably arranged in the receiving cavity, and a slot is formed on the limiting block;

[0010] The first limiting rod, the first end of the first limiting rod sequentially passes through the second limiting cavity and the first limiting cavity and is connected to the pulling block, the width of the first end of the first limiting rod is smaller than the width of the second end of the first limiting rod, and the second end of the first limiting rod is movably arranged in the second limiting cavity;

[0011] The plug pin, the first end of the plug pin is movably arranged in the sliding hole, the second end of the plug pin is located in the accommodating cavity, when the traction block moves in a direction away from the pulling block, the second end of the first limiting rod abuts against the side wall of the second limiting cavity, and the plug pin is movably inserted into the slot.

[0012] In one embodiment, the cross-sectional shape of the plug pin is V-shaped.

[0013] In one embodiment, the sliding hole penetrates through the outer surface of the pulling block, and at least a part of the plug pin protrudes to the outside of the sliding hole.

[0014] In one embodiment, it further includes a second limiting rod, a limiting groove is formed on the plug pin, a first limiting hole is formed on the side wall of the accommodating cavity, and one end of the second limiting rod passes through the first limiting hole and is located in the limiting groove.

[0015] In one embodiment, the number of the slots is two, the two slots are arranged at intervals on the limiting block, and the number of the plug pins is equal to the number of the slots.

[0016] In one embodiment, the secondary core-pulling structure further includes: a slider, the slider is connected to the second end of the traction block, the slider closes the second limiting cavity, and the second end of the first limiting rod is movably abutted against the outer surface of the slider.

[0017] In one embodiment, the secondary core-pulling structure further includes: a sliding seat, and the slider is slidably arranged on the sliding seat.

[0018] In one embodiment, a plurality of limiting inserts are arranged on the traction block, a plurality of second limiting holes are arranged on the pulling block, the second limiting holes penetrate through the pulling block, each limiting insert is movably arranged in one of the second limiting holes, and at least a part of the limiting insert protrudes to the outside of the second limiting hole.

[0019] In one embodiment, the width of the second limiting hole near the traction block end gradually decreases to the width of the second limiting hole far from the traction block end.

[0020] An injection mold includes the secondary core-pulling structure according to any one of the embodiments.

[0021] The beneficial effects of the present utility model are as follows: A secondary core-pulling structure provided by the present utility model has a first limiting cavity opened at the first end of a traction block and a second limiting cavity opened at the second end of the traction block. The first end of a first limiting rod sequentially passes through the first limiting cavity and the second limiting cavity and is connected to a pulling block. A limiting block is provided on the traction block, a slot is opened on the limiting block, a sliding hole is opened on the side wall of an accommodating cavity, and the slot is movably arranged in the sliding hole. When the traction block moves in a direction away from the pulling block, the traction block is separated from the pulling block. The second end of the first limiting rod can abut against the side wall of the bottom of the second limiting cavity. The distance between the slot of the limiting block on the traction block and a pin gradually shortens, the pin is aligned with the slot, and the pin slides into the slot in the sliding hole under the action of gravity. A firm connection is formed between the pin and the limiting block, so that a whole is formed between the traction block and the pulling block. The displacement distance of the traction block can be limited by the first limiting rod, so that the pin can accurately enter the slot. When the traction block moves again, the traction block can drive the pulling block to move synchronously, thus successfully completing the secondary core-pulling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a schematic structural diagram of a secondary core-pulling structure of an embodiment;

[0024] Figure 2 is a three-dimensional exploded structural diagram of a secondary core-pulling structure of an embodiment;

[0025] Figure 3 is a three-dimensional exploded structural diagram of a secondary core-pulling structure of an embodiment;

[0026] Figure 4 is a three-dimensional exploded structural diagram of a secondary core-pulling structure of an embodiment;

[0027] Figure 5 is a schematic cross-sectional structure diagram before a primary core-pulling of an embodiment;

[0028] Figure 6 is a schematic cross-sectional structure diagram after a primary core-pulling of an embodiment;

[0029] Figure 7 is a schematic cross-sectional structure diagram before a primary core-pulling of an embodiment;

[0030] Figure 8Schematic cross-sectional structure diagram after the first core-pulling of an embodiment.

[0031] In the attached drawings, 10 is the secondary core-pulling structure; 100 is the pulling block; 101 is the accommodation cavity; 102 is the connection hole; 103 is the sliding hole; 104 is the first limiting hole; 105 is the second limiting hole; 200 is the traction block; 201 is the first limiting cavity; 202 is the second limiting cavity; 210 is the limiting block; 211 is the slot; 300 is the plug; 301 is the limiting groove; 400 is the first limiting rod; 410 is the second limiting rod; 500 is the limiting insert; 600 is the slider; 700 is the sliding seat; 701 is the sliding groove. Detailed implementation manners

[0032] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other. The following will further describe the technical solutions of the present utility model in conjunction with the drawings of the embodiments of the present utility model. The present utility model is not limited to the following specific implementation manners.

[0033] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] In one embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown in the figure, a secondary core-pulling structure 10 includes: a pulling block 100, a traction block 200, a first limiting rod 400 and a pin 300. A receiving cavity 101 is formed on the pulling block 100, and a sliding hole 103 is formed on the side wall of the receiving cavity 101. The traction block 200 moves in a direction close to or away from the pulling block 100. The first end of the traction block 200 is in movable contact with the pulling block 100. A first limiting cavity 201 is formed at the first end of the traction block 200, and a second limiting cavity 202 is formed at the second end of the traction block 200. The second limiting cavity 202 communicates with the first limiting cavity 201. The width of the second limiting cavity 202 is greater than that of the first limiting cavity 201. A limiting block 210 is arranged at the first end of the traction block 200. The limiting block 210 is movably arranged in the receiving cavity 101. A slot 211 is formed on the limiting block 210. The first end of the first limiting rod 400 sequentially passes through the second limiting cavity 202 and the first limiting cavity 201 and is connected to the pulling block 100. The width of the first end of the first limiting rod 400 is smaller than that of the second end of the first limiting rod 400. The second end of the first limiting rod 400 is movably arranged in the second limiting cavity 202. The first end of the pin 300 is movably arranged in the sliding hole 103, and the second end of the pin 300 is located in the receiving cavity 101. When the traction block 200 moves in a direction away from the pulling block 100, the second end of the first limiting rod 400 abuts against the side wall of the second limiting cavity 202, and the pin 300 is movably inserted into the slot 211.

[0035] In this embodiment, a receiving cavity 101 is formed on the pulling block 100. A sliding hole 103 is formed on the side wall of the receiving cavity 101. The plug pin 300 is movably arranged in the sliding hole 103. The limiting block 210 on the pulling block 200 is movably arranged in the receiving cavity 101. A slot 211 is formed on the limiting block 210. The first end of the first limiting rod 400 passes through the first limiting cavity 201 and the second limiting cavity 202 to be connected with the pulling block 100. The second end of the first limiting rod 400 is movably arranged in the second limiting hole 105. When the mold is not opened, the pulling block 100 abuts against the pulling block 200. The pulling block 200 is located below the pulling block 100. The plug pin 300 is located on one side of the slot 211. When the pulling block 200 moves away from the pulling block 100, the pulling block 200 and the pulling block 100 are gradually separated. The distance between the second end of the first limiting rod 400 and the side wall of the bottom of the second limiting cavity 202 gradually becomes smaller. The limiting block 210 on the pulling block 200 moves towards the direction close to the plug pin 300. The distance between the plug pin 300 and the slot 211 on the limiting block 210 gradually becomes smaller. After the pulling block 200 moves a specified distance, the second end of the first limiting rod 400 abuts against the side wall of the bottom of the limiting cavity 202. The slot 211 on the limiting block 210 is aligned with the plug pin 300. Under the action of gravity, the plug pin 300 slides in the sliding hole 103 and enters the slot 211, so that a firm connection is formed between the pulling block 200 and the pulling block 100, and an integral body is formed between the pulling block 200 and the pulling block 100. The moving distance of the pulling block 200 can be limited by the second limiting rod 410, so that the plug pin 300 can accurately insert into the slot 211, and a core-pulling operation is successfully completed. Move the pulling block 200 again in the direction away from the pulling block 100. The pulling block 200 and the pulling block 100 can move synchronously, so that the secondary core-pulling process can be successfully completed.

[0036] In order to improve the stability of the connection between the first limiting rod 400 and the pulling block 100, in one embodiment, as Figure 3 、 Figure 4 and Figure 6 shown, a connection hole 102 is formed on the pulling block 100. The first end of the first limiting rod 400 passes through the second limiting cavity 202 and the first limiting cavity 201 in sequence and is connected with the side wall of the connection hole 102. In this embodiment, by connecting the first end of the first limiting rod 400 with the side wall of the connection hole 102, the connection between the first limiting rod 400 and the pulling block 100 is made more stable, thereby improving the stability when the pulling block 200 and the pulling block 100 move synchronously.

[0037] In order to improve the smoothness of the plug pin 300 entering or exiting the slot 211. In one embodiment, as Figure 3 、 Figure 4 and Figure 6As shown, the cross-sectional shape of the bolt 300 is V-shaped. In this embodiment, the bolt 300 with a V-shaped cross-sectional shape reduces the resistance and friction during the process of entering or exiting the slot 211, enabling the bolt 300 to enter or exit the slot 211 more smoothly, thereby improving the smoothness of the bolt 300 entering or exiting the slot 211, and enabling the bolt 300 to better connect with the side wall of the slot 211 or better reset.

[0038] To improve the controllability of the secondary core-pulling device during core-pulling. In one embodiment, as Figure 1 and Figure 3 shown, the sliding hole 103 is provided through the outer surface of the pulling block 100, and at least a part of the bolt 300 protrudes outside the sliding hole 103. In this embodiment, before the mold is opened, a part of the bolt 300 protrudes outside the sliding hole 103. When the first core-pulling starts, the bolt 300 moves in a direction away from the outside of the sliding hole 103 under the action of gravity, and the position of the bolt 300 in the sliding hole 103 will change. Through the above settings, the position change of the bolt 300 in the sliding hole 103 can be directly observed to judge whether the bolt 300 is correctly inserted into the slot 211 on the limiting block 210, so as to make dynamic adjustments according to the connection state between the bolt 300 and the side wall of the slot 211.

[0039] To improve the stability when the bolt 300 is connected to the slot 211. In one embodiment, as Figure 4 、 Figure 5 and Figure 6 shown, a limiting groove 301 is provided on the bolt 300, a first limiting hole 104 is provided on the side wall of the accommodating cavity 101, and one end of the second limiting rod 410 passes through the first limiting hole 104 and is located in the limiting groove 301. In this embodiment, the outer surface of the second limiting rod 410 abuts against the side wall of the limiting groove 301. When the bolt 300 slides into the slot 211 under the action of gravity, the second limiting rod 410 and the limiting groove 301 can further limit and guide the sliding of the bolt 300, enabling the bolt 300 to be more accurately inserted into the slot 211.

[0040] To further improve the firmness of the connection between the traction block 200 and the pulling block 100. In one embodiment, as Figure 5 and Figure 6As shown, the number of the slots 211 is two, and the two slots 211 are arranged at intervals on the limiting block 210. The number of the pins 300 is equal to that of the slots 211. In this embodiment, by providing two groups of slots 211 on the limiting block 210, and the numbers of the pins 300, the sliding holes 103, the first limiting holes 104, and the second limiting rods 410 are all equal to that of the slots 211. Through the above arrangement, each pin 300 is clamped with the side wall of a slot 211, so that the connection between the traction block 200 and the pulling block 100 is increased, and the connection between the traction block 200 and the pulling block 100 is more stable, thereby increasing the stability during the secondary core pulling.

[0041] To improve the limiting accuracy of the first limiting rod 400. In one embodiment, as Figure 7 and Figure 8 shown, the secondary core pulling structure 10 further includes: a slider 600, the slider 600 is connected to the second end of the traction block 200, the slider 600 closes the second limiting cavity 202, and the second end of the first limiting rod 400 is in movable contact with the outer surface of the slider 600. In this embodiment, the slider 600 and the traction block 200 are connected by a screw. The first end of the slider 600 closes the second limiting cavity 202. When the mold is not opened, the second end of the first limiting rod 400 abuts against the outer surface of the first end of the slider 600 to limit the position of the second end of the first limiting rod 400 in the second limiting cavity 202, and to prevent the second end of the first limiting rod 400 from exceeding the range defined by the second limiting cavity 202, so as to ensure that when the second end of the first limiting rod 400 abuts against the side wall of the bottom of the second limiting cavity 202, the pin 300 can accurately enter the slot 211.

[0042] To achieve the primary core pulling and the secondary core pulling. In one embodiment, as Figure 1 and Figure 5As shown, the secondary core-pulling structure 10 further includes: a sliding seat 700, and the slider 600 is slidably arranged on the sliding seat 700. In this embodiment, the secondary core-pulling structure 10 is a part of an injection mold, and the injection mold includes an upper template, a lower template and a driver. The upper template is provided with an inclined groove, and a placement cavity is provided at the first end of the lower template. The inclined groove and the placement cavity are in communication with each other. The pulling block 100, the traction block 200 and the slider 600 are sequentially arranged in the inclined groove. A chute 701 is provided on the sliding seat 700, and the slider 600 is slidably arranged in the chute 701. The sliding seat 700 is arranged in the placement cavity. The lower template moves in a direction close to or away from the upper template. The driver is connected to the second end of the lower template. By driving the lower template by the driver, the sliding seat 700 is driven to move downward, and the lower template is separated from the upper template. When the slider 600 slides in the chute 701, the traction block 200 is driven to slide in the inclined groove, so that the traction block 200 is separated from the pulling block 100. As the sliding seat 700 moves, the plug pin 300 is inserted into the slot 211 and the second end of the first limiting rod 400 abuts against the bottom side wall of the second limiting cavity 202. The traction block 200 and the pulling block 100 form an integral body to complete the first core-pulling. The sliding seat 700 is driven to move downward again by the driver, and the sliding seat 700 drives the slider 600, the traction block 200 and others to move together, thereby completing the secondary core-pulling.

[0043] In order to improve the stability of the first core-pulling process. In one embodiment, as Figure 1 and Figure 2 shown, a plurality of limiting inserts 500 are arranged on the traction block 200, and a plurality of second limiting holes 105 are arranged on the pulling block 100. The second limiting holes 105 penetrate through the pulling block 100. Each limiting insert 500 is movably arranged in one of the second limiting holes 105, and at least part of the limiting insert 500 protrudes outside the second limiting hole 105. In this embodiment, through the second limiting holes 105, the moving direction of the limiting inserts 500 can be restricted, preventing the limiting inserts 500 from deviating from the predetermined track, and improving the stability during the first core-pulling process. It should be noted that before the mold is opened, one end of each limiting insert 500 is located in the undercut structure of the workpiece. When the traction block 200 moves in a direction away from the pulling block 100, each limiting insert 500 gradually moves away from the undercut structure, and each limiting insert 500 is disengaged from the undercut structure.

[0044] In order to improve the smoothness of the movement of the limit insert pin 500. In one embodiment, the width of the second limit hole 105 near one end of the traction block 200 gradually decreases to the width of the second limit hole 105 far from one end of the traction block 200. In this embodiment, by setting the second limit hole 105 with a gradually changing width, the limit insert 500 moves more smoothly within the second limit hole 105, thereby improving the smoothness of the movement of the traction block 200.

[0045] In one embodiment, an injection mold includes the secondary core-pulling structure 10 described in any one of the above embodiments. In this embodiment, the injection mold has the secondary core-pulling structure 10, so that the injection mold can have a better secondary core-pulling effect, can realize the demolding process of complex molds, and improves the functionality and application range of the injection mold.

[0046] Compared with the prior art, the present invention has at least the following advantages:

[0047] A secondary core-pulling structure provided by the present invention, by opening a first limit cavity on the first end of the traction block, opening a second limit cavity on the second end of the traction block, the first end of the first limit rod sequentially passes through the first limit cavity and the second limit cavity to be connected with the pull block, a limit block is arranged on the traction block, a slot is opened on the limit block, a sliding hole is opened on the side wall of the accommodating cavity, and the slot is movably arranged in the sliding hole. When the traction block moves in a direction away from the pull block, the traction block is separated from the pull block, the second end of the first limit rod can abut against the side wall of the bottom of the second installation cavity limit cavity, the distance between the slot of the limit block on the traction block and the pin gradually shortens, the pin is aligned with the slot, and the pin slides into the slot in the sliding hole under the action of gravity, and a firm connection is formed between the pin and the limit block, so that a whole is formed between the traction block and the pull block. The displacement distance of the traction block can be limited by the first limit rod, so that the pin can accurately enter the slot. When the traction block moves again, the traction block can drive the pull block to move synchronously, thereby successfully completing the secondary core-pulling process.

[0048] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the embodiments here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A secondary core pulling structure, characterized in that: include: A pull-out block, wherein a receiving cavity is provided on the pull-out block, and a sliding hole is provided on a side wall of the receiving cavity; A traction block, wherein the traction block moves in a direction close to or away from the pull block, the first end of the traction block movably abuts against the pull block, a first limiting cavity is provided on the first end of the traction block, a second limiting cavity is provided on the second end of the traction block, the second limiting cavity is communicated with the first limiting cavity, the width of the second limiting cavity is greater than the width of the first limiting cavity, a limiting block is provided on the first end of the traction block, the limiting block is movably provided in the accommodating cavity, and a slot is provided on the limiting block; a first limiting rod, wherein the first end of the first limiting rod sequentially passes through the second limiting cavity and the first limiting cavity and is connected to the pull-out block, the first end of the first limiting rod has a width smaller than the second end of the first limiting rod, and the second end of the first limiting rod is movably disposed in the second limiting cavity; A latch, wherein the first end of the latch is movably arranged in the sliding hole, and the second end of the latch is located in the accommodating cavity. When the traction block moves away from the pulling block, the second end of the first limiting rod abuts against the side wall of the second limiting cavity, and the latch is movably inserted in the slot.

2. The secondary core pulling structure according to claim 1, characterized in that: The cross-section of the latch is V-shaped.

3. The secondary core pulling structure according to claim 1, characterized in that: The sliding hole is arranged through the outer surface of the pull block, and the latch is arranged so as to at least partially protrude to the outer side of the sliding hole.

4. The secondary core pulling structure according to claim 1, characterized in that: It also includes a second limiting rod, the latch is provided with a limiting groove, the side wall of the accommodating cavity is provided with a first limiting hole, and one end of the second limiting rod passes through the first limiting hole and is located in the limiting groove.

5. The secondary core pulling structure according to claim 1, characterized in that: The number of the slots is two, and the two slots are arranged on the limit block at an interval, and the number of the pins is equal to the number of the slots.

6. The secondary core pulling structure according to claim 1, characterized in that: Also includes: A slider is connected to the second end of the traction block, the slider closes the second limiting cavity, and the second end of the first limiting rod is movably abutted against the outer surface of the slider.

7. The secondary core pulling structure according to claim 6, characterized in that: Also includes: A sliding seat, on which the sliding block is slidably arranged.

8. The secondary core pulling structure according to claim 1, characterized in that: The traction block is provided with a plurality of limiting inserts, and the pulling block is provided with a plurality of second limiting holes, the second limiting holes are provided through the pulling block, each limiting insert is movably provided in one of the second limiting holes, and the limiting insert at least partially protrudes out of the outer side of the second limiting hole.

9. The secondary core pulling structure according to claim 8, characterized in that: The width of the second limiting hole from an end close to the traction block to an end far away from the traction block gradually decreases.

10. An injection mold, characterized in that: It comprises the secondary core pulling structure as described in any one of claims 1 to 9.

Images