Secondary ejection mechanical drag hook mechanism of injection mold
Through the secondary top mechanical hook mechanism of injection mold, the combination of the tie rod and the connecting block can achieve two ejections of the oil cylinder in one cylinder, which solves the problem of large mold space occupation and wrong action, and achieves structural simplification and production efficiency improvement.
Patent Information
- Application Number
- CN202421702599.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-18
AI Technical Summary
When handling plastic products with internal inverted buckles, existing injection molds require two sets of oil cylinders and stroke switches, resulting in large space occupancy, and the oil cylinder movement is prone to errors, affecting production efficiency and product quality.
The secondary top mechanical hook mechanism of injection mold is adopted. By setting up a tie rod and connecting block on the surface needle plate and the bottom needle plate, and using the fit of the insert, the two ejection operations of the oil cylinder can be completed in one time, reducing space occupation, and limiting the ejection stroke through the limit block to prevent the oil cylinder from getting stuck.
The mold structure is simplified, manufacturing costs are reduced, production efficiency and product quality are improved, mold movement errors are avoided, and smooth ejection and reset are ensured.
Smart Images
Figure CN223131300U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molds, and particularly relates to a secondary ejection mechanical hook mechanism for an injection mold. Background Art
[0002] In the injection molding of plastic products, some plastic products usually have annular undercuts or internal concavities inside their structures, making it impossible to remove the plastic parts from the mold core by conventional ejection mechanisms after molding, and special designs are required to solve this problem. For example, when manufacturing plastic parts using a conventional injection mold, if there are internal undercuts in the plastic product, the traditional method is to use a top plate or an oil cylinder to push the ejection mechanism to act and hold the plastic product for demolding, while the inclined ejector in the middle pushes the internal undercuts on the plastic product to be forced outwards for demolding. When an ordinary inclined ejector cannot meet the normal demolding requirements (for example, there is no space on the product for a normal inclined ejector, and the ejection will interfere with the product), an additional straight ejector is required; the inclined ejector is located below the straight ejector and will not interfere with the product after ejection. However, the straight ejector ejects synchronously with the product. If there are ribs, deep cavities, or bosses on the product, or even most of the product is located on the straight ejector, it may cause the product to be difficult to remove or impossible to remove, and in this case, a second ejection of the mold is required. The second ejection is different from the first ejection. The first ejection is generally driven by an oil cylinder to drive the ejector plate to drive the inclined ejector to withdraw from the undercut, and the second ejection is to push the product out of the straight ejector to facilitate the removal of the product by a manipulator or manually. Currently, there are various ejection methods for molds, such as: mechanical ejection with spring reset of an injection molding machine, mechanical ejection with nitrogen spring reset of an injection molding machine, mechanical ejection with tail pipe forced pulling reset of an injection molding machine, and oil cylinder ejection and reset. When using an oil cylinder to achieve ejection and reset, two groups of oil cylinders can be used, one group for the first ejection and the other group for the second ejection, and the oil cylinders are controlled by travel switches. Since both groups of oil cylinders require oil circuits and must be separated during ejection, two groups of corresponding travel switches are also required, which will occupy a large amount of space in the mold; in addition, the movement of the oil cylinder is generally straight up and down, which is prone to errors. Summary of the Utility Model
[0003] The present application provides a mechanical hook mechanism for the secondary ejection of an injection mold to overcome the above problems existing in the prior art. The mechanical hook mechanism for the secondary ejection of the injection mold in the present application sets a pull rod and a connecting block on the face ejector plate and the bottom ejector plate respectively, and sets a first insert block and a second insert block in the pull rod and the connecting block respectively. Thus, through the mutual cooperation of the pull rod, the connecting block, the first insert block and the second insert block, the face ejector plate and the bottom ejector plate can be fixed together for the first ejection, and then the face ejector plate and the bottom ejector plate can be separated for the second ejection. At this time, only one set of oil cylinders is needed to realize the two ejection operations of the injection mold, greatly reducing the occupied space. Furthermore, the overall structure of the injection mold can be simplified, the manufacturing cost is low, and the assembly is convenient; in addition, limit blocks are provided on both the face ejector plate and the bottom ejector plate to limit the ejection stroke, thereby preventing the situation that the mold movement goes wrong due to the oil cylinder being stuck, and ensuring the quality of the product and the production.
[0004] The technical solution of the present application is as follows:
[0005] A mechanical hook mechanism for the secondary ejection of an injection mold, comprising an oil cylinder, an ejector plate and a hook assembly; the oil cylinder is fixed on the outer side surface of the core; the ejector plate is arranged between the lower die plate and the core, and comprises a face ejector plate and a bottom ejector plate which are distributed up and down; the driving rod of the oil cylinder is fixedly connected with the face ejector plate; the hook assembly comprises a fixed block, a pull rod and a connecting block; the fixed block is fixed on the outer side surface of the die foot; the upper end of the pull rod is fixed on the face ejector plate, and the lower end passes through the through hole on the connecting block; the connecting block is fixed on the bottom ejector plate, and a first insert block is arranged inside it. When the injection mold is closed, one end of the first insert block inserts into the A positioning groove on the side of the pull rod, and the other end abuts against the side wall of the fixed block; a second insert block is arranged inside the fixed block, and a B positioning groove for the first insert block to insert into is arranged on the second insert block; a first limit block is arranged on the face ejector plate, and a second limit block is arranged on the bottom ejector plate.
[0006] Compared with the prior art, the mechanical hook mechanism for the secondary ejection of the injection mold in the present application comprises an oil cylinder, an ejector plate and a hook assembly; among them, the ejector plate comprises a face ejector plate and a bottom ejector plate, the oil cylinder is fixedly connected with the face ejector plate, the hook assembly comprises a pull rod and a connecting block arranged on the face ejector plate and the bottom ejector plate, and a first insert block and a second insert block are arranged in the pull rod and the connecting block respectively; thus, through the mutual cooperation of the pull rod, the connecting block, the first insert block and the second insert block, the face ejector plate and the bottom ejector plate can be fixed together for the first ejection, and then the face ejector plate and the bottom ejector plate can be separated for the second ejection. At this time, only one set of oil cylinders is needed to realize the two ejection operations of the injection mold, greatly reducing the occupied space. Furthermore, the overall structure of the injection mold can be simplified, the manufacturing cost is low, and the assembly is convenient; in addition, limit blocks are provided on both the face ejector plate and the bottom ejector plate to limit the ejection stroke, thereby preventing the situation that the mold movement goes wrong due to the oil cylinder being stuck, and ensuring the quality of the product and the production.
[0007] As an optimization, in the aforementioned secondary ejection mechanical hook mechanism of the injection mold, a push plate guide column is provided between the lower code template and the core; the surface needle plate and the bottom needle plate are sleeved on the push plate guide column. During the mold opening process, the push plate guide column can guide the movement of the ejector plate to better realize the mold opening action, and avoid the action jamming during mold opening as much as possible, causing damage to the mold parts, or poor ejection, which has an adverse effect on the injection molded product in the cavity.
[0008] As an optimization, in the aforementioned secondary ejection mechanical hook mechanism of the injection mold, a reset rod is provided on the face needle plate. Therefore, when the mold is reset after opening the mold and taking out the part, the cavity will first contact the reset rod and press the reset rod downward to push the face needle plate and the bottom needle plate to reset, thereby avoiding the situation of mold collision when the mold is reset.
[0009] As an optimization, in the aforementioned secondary ejection mechanical hook mechanism for the injection mold, a cylinder meson is fixed to the end of the driving rod; the cylinder meson is fixed to the face needle plate by snap-fit connection. In this case, the assembly is convenient and easy to implement.
[0010] As an optimization, in the aforementioned secondary ejection mechanical hook mechanism of the injection mold, a limit block is provided on the side of the bottom needle plate opposite to the connection block; a guide rod is provided on the limit block, and the guide rod cooperates with the guide block on the outer surface of the core to form a sliding pair. In this way, the force balance of the surface needle plate and the bottom needle plate during synchronous movement can be improved, positional deviation can be prevented, and the ejection operation can be ensured to proceed smoothly.
[0011] As an optimization, in the aforementioned secondary top mechanical hook mechanism of the injection mold, the A positioning groove and the B positioning groove are both U-shaped, and the groove walls are inclined. Therefore, when the first insert is subjected to force, it is easier to escape from one of the positioning grooves and insert into the other positioning groove.
[0012] As an optimization, in the aforementioned secondary ejection mechanical hook mechanism of the injection mold, a receiving hole for inserting the tie rod is provided on the lower code template; when the mold is closed, the tie rod is inserted into the receiving hole. As a result, the tie rod can be designed to be longer, so that when the mold is reset, more of the lower end of the tie rod is located in the connection block to avoid being stuck during reset.
[0013] As an optimization, in the aforementioned injection mold secondary top mechanical hook mechanism, the pull rod is provided with an A limit protrusion, and the limit protrusion is inserted into the limit groove on the surface needle plate; the connecting block is provided with a B limit protrusion, and the B limit protrusion is inserted into the limit groove on the bottom needle plate, thereby improving the connection firmness between the pull rod and the surface needle plate, and between the connecting block and the bottom needle plate.
[0014] As an optimization, in the above-mentioned mechanical hook mechanism for the secondary ejection of the injection mold, in order to ensure the balance during the ejection and reset of the mold, the number of the oil cylinders and the hook assemblies is 4, and they are evenly distributed on both sides of the ejector plate. Description of the Drawings
[0015] Figure 1 is a schematic structural view of the mechanical hook mechanism for the secondary ejection of the injection mold of the present application;
[0016] Figure 2 is a schematic structural view of the hook assembly in the present application;
[0017] Figure 3 is a state diagram of the hook assembly in the present application when the injection mold is closed;
[0018] Figure 4 is a state diagram of the hook assembly in the present application after the first ejection of the injection mold;
[0019] Figure 5 is a state diagram of the hook assembly in the present application after the second ejection of the injection mold;
[0020] Figure 6 is a schematic view of the injection mold equipped with the mechanical hook mechanism for the secondary ejection of the present application.
[0021] The reference numerals in the drawings are: 1 - oil cylinder; 2 - face ejector plate; 3 - bottom ejector plate; 4 - fixing block; 5 - pull rod, 51 - A limit projection, 501 - A positioning groove; 6 - connecting block, 61 - B limit projection; 7 - first insert block; 8 - second insert block, 801 - B positioning groove; 9 - lower code template; 10 - core; 11 - mold feet; 12 - ejector guide pillar; 13 - reset rod; 14 - oil cylinder spacer; 15 - limit baffle; 16 - limit block; 17 - guide rod; 18 - guide block; 19 - cavity. Detailed Embodiments
[0022] The present application will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present application.
[0023] Embodiment (see Figures 1 to 3 ):
[0024] The secondary ejector mechanical hook mechanism of the injection mold of this embodiment includes an oil cylinder 1, an ejector plate and a hook assembly; the oil cylinder 1 is fixed to the outer surface of the core 10 by bolts; the ejector plate is arranged between the lower code template 9 and the core 10, and includes a surface needle plate 2 and a bottom needle plate 3 distributed up and down; the driving rod of the oil cylinder 1 is fixedly connected to the surface needle plate 2; the hook assembly includes a fixed block 4, a pull rod 5 and a connecting block 6; the fixed block 4 is fixed to the outer surface of the mold foot 11, and the mold foot 11 is arranged between the lower code template 9 and the core 10; the upper end of the pull rod 5 is fixed to the surface needle plate 2 by bolts, and the lower end passes through the through hole on the connecting block 6; the connecting block 6 is fixed to the bottom needle plate 3 by bolts, and a first insert 7 is arranged inside the bottom needle plate 3. When the injection mold is closed, one end of the first insert 7 is inserted into the A positioning groove 501 on the side of the pull rod 5, and the other end is against the side wall of the fixed block 4; a second insert 8 (fixed by bolts) is arranged inside the fixed block 4, and a B positioning groove 801 for inserting the first insert 7 is arranged on the second insert 8; the A positioning groove 501 and the B positioning groove 801 are both U-shaped, and the groove walls are inclined; a first limit block 21 is arranged on the face needle plate 2, and a second limit block 31 is arranged on the bottom needle plate 3, and the top of the second limit block 31 is higher than the top of the first limit block 21.
[0025] The injection mold equipped with the above-mentioned secondary top mechanical hook mechanism is as follows Figure 6 shown.
[0026] In this embodiment, a push plate guide column 12 is provided between the lower code template 9 and the core 10; the panel plate 2 and the bottom needle plate 3 are sleeved on the push plate guide column 12. During the mold opening process, the push plate guide column 12 can guide the movement of the ejector plate, so as to better realize the mold opening action, and avoid the action jamming during the mold opening as much as possible, causing damage to the mold parts, or poor ejection, which has an adverse effect on the injection molded product in the cavity.
[0027] In this embodiment, a reset rod 13 is provided on the face needle plate 2. Therefore, when the mold is reset after opening the mold and taking out the part, the cavity 19 will first contact the reset rod 13 and press the reset rod 13 downward to push the face needle plate 2 and the bottom needle plate 3 to reset, thereby avoiding the mold collision when the mold is reset, and further preventing the occurrence of safety accidents and the consequence that the mold cannot be damaged and production cannot be continued.
[0028] In this embodiment, a cylinder meson 14 is fixed to the end of the driving rod; the cylinder meson 14 is I-shaped, which is inserted into the U-shaped groove on the needle plate 2 and is limited by a limit baffle 15; the limit baffle 15 is fixedly connected to the needle plate 2.
[0029] In this embodiment, on the bottom ejector plate 3, on the side opposite to the connecting block 6, a limiting block 16 is provided; on the limiting block 16, a guide rod 17 is provided, and the guide rod 17 cooperates with a guide block 18 on the outer side of the core 10 to form a sliding pair. Thus, the force balance during the synchronous movement of the top ejector plate 2 and the bottom ejector plate 3 can be improved, preventing position deviation and ensuring the smooth progress of the ejection operation.
[0030] In this embodiment, on the lower code template 9, a receiving hole for inserting the pull rod 5 is provided. Thus, the pull rod 5 can be designed to be longer, so that when the mold is reset, a relatively large part of the lower end of the pull rod 5 is located inside the connecting block 6, avoiding being stuck during reset.
[0031] In this embodiment, on the pull rod 5, an A limiting protrusion 51 is provided, and the limiting protrusion 51 is inserted into a limiting groove on the top ejector plate 2; on the connecting block 6, a B limiting protrusion 61 is provided, and the B limiting protrusion 61 is inserted into a limiting groove on the bottom ejector plate 3. Thereby, the connection firmness between the pull rod 5 and the top ejector plate 2, as well as between the connecting block 6 and the bottom ejector plate 3, can be improved.
[0032] In this embodiment, the number of the oil cylinders 1 and the hook assemblies is 4, and they are evenly distributed on both sides of the ejector plate; thus, the balance during the mold ejection and reset is ensured.
[0033] When the injection mold is opened, the oil cylinder 1 drives the top ejector plate 2 to move upward. Since the end of the first insert block 7 is inserted into the A positioning groove 501, the pull rod 5 and the connecting block 6 are locked (see Figure 3 ), so that the top ejector plate 2 and the ejector plate 3 are fixed together, and the bottom ejector plate 3 moves upward synchronously with the top ejector plate 2 until the second limiting block 31 contacts the bottom of the core 10, completing the first ejection;
[0034] At this time, the A positioning groove 501 and the B positioning groove 801 are opposite (that is, both ends of the first insert block 7 are respectively aligned with the A positioning groove 501 and the B positioning groove 801). When the oil cylinder 1 drives the top ejector plate 2 to continue moving upward, the bottom ejector plate 3 is affected by the second limiting block 31 and no longer moves upward. Thus, it drives the first insert block 7 to be inserted into the B positioning groove 801, and the pull rod 5 and the connecting block 6 are unlocked (see Figure 4 ), so that the top ejector plate 2 and the bottom ejector plate 3 are separated, and only the top ejector plate 2 continues to move upward until the first limiting block 21 contacts the bottom of the core 10, completing the second ejection (see Figure 5 , at this time, a part of the lower end of the pull rod 5 is still inside the connecting block 6); the injection molded product is ejected from the core 10 by the ejector rod on the top ejector plate 2, completing the demolding.
[0035] The above general description of the utility model involved in this application and the description of its specific implementation should not be construed as a limitation on the technical solution of the utility model. Based on the disclosure of this application, those skilled in the art can, without departing from the constituent elements of the utility model involved, add, subtract, or combine the disclosed technical features in the above general description or / and specific implementation (including embodiments) to form other technical solutions within the scope of protection of this application.
Claims
1. The secondary ejection mechanical hook mechanism of an injection mold, characterized in that: It includes an oil cylinder (1), a thimble plate and a hook assembly; the oil cylinder (1) is fixed on the outer side surface of the core (10); the thimble plate is arranged between the lower die plate (9) and the core (10), and includes a face thimble plate (2) and a bottom thimble plate (3) which are distributed up and down; the driving rod of the oil cylinder (1) is fixedly connected with the face thimble plate (2); the hook assembly includes a fixed block (4), a pull rod (5) and a connecting block (6); the fixed block (4) is fixed on the outer side surface of the die foot (11); the upper end of the pull rod (5) is fixed on the face thimble plate (2), and the lower end passes through the through hole on the connecting block (6); the connecting block (6) is fixed on the bottom thimble plate (3), and a first insert block (7) is arranged inside it. When the injection mold is closed, one end of the first insert block (7) is inserted into the A positioning groove (501) on the side of the pull rod (5), and the other end abuts against the side wall of the fixed block (4); a second insert block (8) is arranged inside the fixed block (4), and a B positioning groove (801) for the first insert block (7) to insert is arranged on the second insert block (8); a first limiting block (21) is arranged on the face thimble plate (2), and a second limiting block (31) is arranged on the bottom thimble plate (3).
2. The secondary ejection mechanical hook mechanism of the injection mold according to claim 1, wherein: A ejector pin guide post (12) is arranged between the lower die plate (9) and the core (10); the face plate (2) and the bottom thimble plate (3) are sleeved on the ejector pin guide post (12).
3. The secondary ejection mechanical hook mechanism of the injection mold according to claim 1, wherein: A return rod (13) is arranged on the face thimble plate (2).
4. The secondary ejection mechanical hook mechanism of the injection mold according to claim 1, wherein: An oil cylinder spacer (14) is fixed at the end of the driving rod; the oil cylinder spacer (14) is fixedly connected with the face thimble plate (2) through snap fit.
5. The secondary ejection mechanical hook mechanism of the injection mold according to claim 1, characterized in that: On the bottom thimble plate (3), on the side opposite to the connecting block (6), a limiting block (16) is arranged; a guide rod (17) is arranged on the limiting block (16), and the guide rod (17) cooperates with the guide block (18) on the outer side surface of the core (10) to form a sliding pair.
6. The secondary ejection mechanical hook mechanism of the injection mold according to claim 1, characterized in that: Both the A positioning groove (501) and the B positioning groove (801) are U-shaped, and the groove walls are inclined.
7. The secondary ejection mechanical hook mechanism of the injection mold according to claim 1, characterized in that: A receiving hole for the pull rod (5) to insert is arranged on the lower die plate (9).
8. The secondary ejection mechanical hook mechanism of the injection mold according to claim 1, wherein: An A limiting protrusion (51) is arranged on the pull rod (5), and the A limiting protrusion (51) is inserted into the limiting groove on the face thimble plate (2); a B limiting protrusion (61) is arranged on the connecting block (6), and the B limiting protrusion (61) is inserted into the limiting groove on the bottom thimble plate (3).
9. The secondary ejection mechanical hook mechanism of the injection mold according to claim 1, characterized in that: The number of the oil cylinders (1) and the hook assemblies is 4, and they are evenly distributed on both sides of the thimble plate.