A new structure of ejection of a screw post

Abstract

The utility model discloses a new structure of ejection die of screw post, including fixed plate and install lower mould seat on fixed plate, be equipped with core on lower mould seat, install insert on core, be provided with the perforation of intercommunication on fixed plate and the tray, the KO column of fixed connection with top plate is equipped in the perforation, be provided with the intercommunication of L shape groove on tray and top plate, set up L type spare in L shape groove, the bottom of L type spare is equipped with spring, and the other end of spring is connected with fixed plate, and the horizontal portion end of L type spare is installed and penetrates the ejector pin no.

Description

Technical Field

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

[0002] Plastic molds are tools used to process and shape plastic products. They enable mass production by giving plastic specific shapes and precise dimensions. They are widely used in the automotive, home appliance, and electronics industries. Their core structure includes moving molds, fixed molds, and systems for gating, temperature control, and ejection.

[0003] In injection molding, when a product structure contains tall screws, conventional ejection mechanisms are difficult to effectively demold due to their height, which can easily cause product deformation. To solve this problem, ejector sleeves (also known as ejector pins) are usually used for ejection. The axial movement of the ejector sleeve pushes the screws out of the core.

[0004] However, in practical applications, a situation may occur where the ejector pin inside the sleeve hits the KO hole and interferes with it, causing the ejection action to be obstructed and affecting the normal mold opening. Utility Model Content

[0005] The purpose of this utility model is to provide a novel ejection and demolding structure for a screw post, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A novel ejection and demolding structure for a screw post includes a fixed plate and a lower mold base mounted on the fixed plate. The lower mold base has a core, and an insert is mounted on the core. From bottom to top, the fixed plate has a support plate, a top plate, and a push plate. The fixed plate and the support plate have communicating through holes. A KO post, fixedly connected to the top plate, is located within the through holes. The support plate and the top plate have communicating L-shaped grooves. An L-shaped component is located within the L-shaped grooves. A spring is located at the bottom of the L-shaped component, and the other end of the spring is connected to the fixed plate. A first ejector pin, penetrating the lower mold base, is mounted at the lateral end of the L-shaped component. The first ejector pin is located above the KO post, and its top end has a forming part extending into the core. The diameter of the forming part is smaller than the diameter of the first ejector pin, and the height of the lateral part of the L-shaped component is smaller than the height of the lateral part of the L-shaped groove. A second ejector pin, engaging with the insert, is located on the push plate.

[0008] Furthermore, the distance between the top of the push plate and the bottom of the lower mold base is 100mm, the height of the lateral part of the L-shaped part is 15mm less than the height of the lateral part of the L-shaped groove, and the distance between the top of the ejector pin and the bottom of the core is 85mm.

[0009] Furthermore, the top of the fixing plate is provided with a groove corresponding to the L-shaped groove, the bottom of the L-shaped part extends into the groove, the bottom of the L-shaped part abuts against the bottom surface of the groove, and a limiting groove is provided at the center of the bottom, and the spring is located in the limiting groove.

[0010] Furthermore, a positioning bolt is threaded onto the groove. The positioning bolt includes a threaded portion and a smooth portion. The smooth portion is located on one side of the limiting groove. The bottom of the limiting groove is provided with a positioning sleeve for positioning and inserting the smooth portion. The spring is sleeved on the positioning bolt, with one end connected to the bottom of the groove and the other end connected to the positioning sleeve.

[0011] Furthermore, the horizontal end of the L-shaped component is provided with a mounting groove, and the top of the mounting groove and the side away from the vertical part of the L-shaped component are provided with an opening for inserting a pin.

[0012] Furthermore, the mounting groove is L-shaped, with its horizontal portion located below the vertical portion. The bottom of the ejector pin is provided with a limiting head, and the three side walls, top surface, and bottom surface of the limiting head all abut against the inner wall of the horizontal portion of the mounting groove.

[0013] The beneficial effects of this utility model are:

[0014] This invention features an L-shaped groove connecting the support plate and the top plate, within which an L-shaped component is installed. A spring is located at the bottom of the L-shaped component, with the other end connected to a fixed plate. When the top plate and push plate are not ejected, the spring is compressed, continuously applying an upward elastic force to the L-shaped component. A first ejector pin, penetrating the lower mold base, is installed at the lateral end of the L-shaped component. This ejector pin is positioned above the KO pillar, and its top end has a forming part extending into the core. The forming part is used to form the inner hole structure of the screw pillar on the product. The injection molding machine's ejector rod pushes the KO pillar upwards, causing the top plate and push plate to rise as a whole. Since the L-shaped component is supported on the fixed plate by a spring, and the spring is compressed, when the KO pillar pushes the top plate and push plate upwards, the spring releases its elastic energy, pushing the L-shaped component upwards synchronously. The L-shaped component causes the first ejector pin to move upwards by 85mm. This design utilizes the cooperation of the first ejector pin, the second ejector pin, and the insert. The initial ejection of the product is achieved. When ejector pin one moves up to contact the bottom of the core, the movement of ejector pin one and L-shaped part is limited and stops rising. Since there is a 15mm vertical gap between L-shaped part and L-shaped groove, the top plate and push plate can continue to rise 15mm under the continuous push of KO column. During this process, ejector pin two on the push plate continues to rise with the push plate and uses inserts to push the product out of the forming part of ejector pin one, completing the final demolding. No manual demolding is required, improving demolding efficiency and solving the interference problem caused by the spatial layout conflict between traditional ejector pins and KO column.

[0015] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] Figure 1 : Overall structural diagram of this utility model.

[0017] Figure 2 Cross-sectional view of this utility model Figure 1 .

[0018] Figure 3 : Figure 2 Enlarged view of the structure of part A.

[0019] Figure 4 : Figure 2 Enlarged view of the structure of part B.

[0020] Figure 5 Cross-sectional view of this utility model Figure 2 .

[0021] Figure 6 : A schematic diagram showing the connection of the fixing plate, support plate, top plate and push plate of this utility model.

[0022] Figure 7 : Exploded view of the ejector pin and L-shaped part of this utility model.

[0023] Figure 8 : Structural diagram of the positioning bolt of this utility model.

[0024] Reference numerals: 1. Fixing plate; 2. Lower mold base; 3. L-shaped part; 4. KO pillar; 5. Ejector pin one; 6. Ejector pin two; 11. Support plate; 12. Top plate; 13. Push plate; 14. L-shaped groove; 15. Groove; 16. Positioning bolt; 17. Spring; 18. Through hole; 21. Core; 22. Insert; 23. Product; 31. Mounting groove; 32. Opening; 33. Limiting groove; 34. Positioning sleeve; 51. Limiting head; 52. Forming part; 161. Threaded part; 162. Smooth part. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0026] Please refer to Figure 1-8 ;

[0027] A novel ejection and demolding structure for a screw post includes a fixed plate 1 and a lower mold base 2 mounted on the fixed plate 1. The lower mold base 2 has a core 21, and an insert 22 is mounted on the core 21. The insert 22 cooperates with the core 21 to form the product 23. On the fixed plate 1, a support plate 11, a top plate 12, and a push plate 13 are arranged sequentially from bottom to top. The fixed plate 1 and the support plate 11 have communicating through holes 18. A KO post 4, fixedly connected to the top plate 12, is located within the through holes 18. When the mold completes mold closing and injection molding and enters the mold opening stage, the ejector rod of the injection molding machine acts on the bottom of the KO post 4, pushing the KO post 4 upwards. This causes the top plate 12 and the push plate 13 to move upwards synchronously, achieving the ejection action. The support plate 11 and the top plate 12 are provided with an L-shaped groove 14 that is connected. An L-shaped part 3 is provided in the L-shaped groove 14. A spring 17 is provided at the bottom of the L-shaped part 3. The other end of the spring 17 is connected to the fixed plate 1. When the top plate 12 and the push plate 13 are not ejected, the spring 17 is in a compressed state and continuously applies an upward elastic force to the L-shaped part 3. An ejector pin 5 that penetrates into the lower mold base 2 is installed at the horizontal end of the L-shaped part 3. The ejector pin 5 is located above the KO pillar 4. Its top end is provided with a forming part 52 that extends into the core 21. The forming part 52 is used to form a screw pillar structure on the product 23. The diameter of the forming part 52 is smaller than the diameter of the ejector pin 5. Therefore, during the ejection process, when the ejector pin 5 rises to the point where its upper end surface contacts the bottom of the core 21, it is limited by the core 21 and cannot move further upward. It is worth noting that, because the horizontal height of the L-shaped part 3 is less than the horizontal height of the L-shaped groove 14, a certain vertical gap is reserved between them. This allows the top plate 12 and push plate 13 to continue moving upwards under the push of the KO column 4 after the ejector pin 5 and the L-shaped part 3 are stopped. The push plate 13 is equipped with an ejector pin 6 that engages with the insert 22. When the top plate 12 and the push plate 13 continue to rise, the ejector pin 6 pushes the insert 22 to move, causing it to displace relative to the core 21, thereby completely ejecting the product 23 from the forming part 52 of the ejector pin 5. This structure solves the interference problem caused by the spatial layout conflict between the traditional ejector pin and the KO column 4. Preferably, the distance between the top of the push plate 13 and the bottom of the lower mold base 2 is 100mm, that is, the maximum upward stroke of the push plate 13 is 100mm, the height of the lateral part of the L-shaped part 3 is 15mm smaller than the height of the lateral part of the L-shaped groove 14, and the distance between the top of the ejector pin 5 and the bottom of the core 21 is 85mm.

[0028] Specifically, after product 23 is injection molded, the mold opens, and the injection molding machine ejector pushes the KO column 4 upward. The KO column 4 drives the top plate 12 and the push plate 13 to rise as a whole. At this time, since the L-shaped part 3 is supported on the fixed plate 1 by the spring 17 and the spring 17 is in a compressed state, when the KO column 4 pushes the top plate 12 and the push plate 13 upward, the spring 17 releases its elastic energy, pushing the L-shaped part 3 to move upward synchronously. The L-shaped part 3 drives the ejector pin 1 5 to move upward by 85mm. This is achieved by the cooperation of ejector pin 1 5, ejector pin 2 6, and insert 22. During the initial ejection of product 23, when ejector pin 5 moves up to contact the bottom of core 21, the movement of ejector pin 5 and L-shaped part 3 is limited and stops rising. However, since there is a 15mm vertical gap between L-shaped part 3 and L-shaped groove 14, top plate 12 and push plate 13 can continue to rise 15mm under the continuous push of KO column 4. During this process, ejector pin 6 on push plate 13 continues to rise with push plate 13 and uses insert 22 to push product 23 out of the forming part 52 of ejector pin 5, completing the final demolding.

[0029] In this embodiment, the top of the fixing plate 1 is provided with a groove 15 corresponding to the L-shaped groove 14. The bottom of the L-shaped part 3 extends into the groove 15, and the bottom of the L-shaped part 3 abuts against the bottom surface of the groove 15. A limiting groove 33 is provided at the center of the bottom, and the spring 17 is located in the limiting groove 33 to achieve axial positioning of the spring 17 and prevent it from shifting laterally during compression and rebound. At the same time, the groove 15 is used to position the reset L-shaped part 3.

[0030] In this embodiment, a positioning bolt 16 is threaded onto the groove 15. The positioning bolt 16 includes a threaded portion 161 and a smooth portion 162. The smooth portion 162 is located on one side of the limiting groove 33. The bottom of the limiting groove 33 is provided with a positioning sleeve 34 for the insertion of the smooth portion 162. The spring 17 is sleeved on the positioning bolt 16, with one end connected to the bottom of the groove 15 and the other end connected to the positioning sleeve 34. By using the positioning bolt 16, the spring 17 is further axially positioned and prevented from shifting. At the same time, when the L-shaped part 3 is reset, the positioning sleeve 34 is inserted into the smooth portion 162, further ensuring the reset accuracy of the L-shaped part 3.

[0031] In this embodiment, the horizontal end of the L-shaped part 3 is provided with a mounting groove 31. The top of the mounting groove 31 and the side away from the vertical part of the L-shaped part 3 are provided with openings 32 for the ejector pin 5 to be inserted. Specifically, the mounting groove 31 is L-shaped, with its horizontal part located below the vertical part. The bottom of the ejector pin 5 is provided with a limiting head 51. The three side walls, top surface and bottom surface of the limiting head 51 all abut against the inner wall of the horizontal part of the mounting groove 31, forming a multi-directional limiting structure to prevent the ejector pin 5 from loosening, rotating or falling off due to force during the ejection process, ensuring the reliability of the ejection action. At the same time, this structural design facilitates later maintenance. When the ejector pin 5 needs to be replaced due to wear or damage, after removing the L-shaped block and the ejector pin 5 from the top plate 12, the push plate 13 and the upper mold base, the ejector pin 5 can be directly pulled out along the opening 32 of the mounting groove 31 to complete the disassembly, which greatly reduces the replacement time of the ejector pin 5 and improves work efficiency.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A novel ejection and demolding structure for a screw post, comprising a fixed plate (1) and a lower mold base (2) mounted on the fixed plate (1), wherein a core (21) is provided on the lower mold base (2), and an insert (22) is mounted on the core (21), characterized in that, The fixed plate (1) is provided with a support plate (11), a top plate (12), and a push plate (13) in sequence from bottom to top. The fixed plate (1) and the support plate (11) are provided with a through hole (18). A KO column (4) fixedly connected to the top plate (12) is provided in the through hole (18). The support plate (11) and the top plate (12) are provided with an L-shaped groove (14). An L-shaped component (3) is provided in the L-shaped groove (14). A spring (17) is provided at the bottom of the L-shaped component (3). The other end is connected to the fixing plate (1). The horizontal part of the L-shaped part (3) is equipped with a first ejector pin (5) that penetrates the lower mold base (2). The first ejector pin (5) is located above the KO column (4). Its top end is provided with a forming part (52) that extends into the core (21). The diameter of the forming part (52) is smaller than the diameter of the first ejector pin (5). The height of the horizontal part of the L-shaped part (3) is smaller than the height of the horizontal part of the L-shaped groove (14). The push plate (13) is provided with a second ejector pin (6) that engages with the insert (22).

2. The novel ejection and demolding structure for a screw post according to claim 1, characterized in that, The distance between the top of the push plate (13) and the bottom of the lower mold base (2) is 100mm. The height of the horizontal part of the L-shaped part (3) is 15mm smaller than the height of the horizontal part of the L-shaped groove (14). The distance between the top of the ejector pin (5) and the bottom of the core (21) is 85mm.

3. The novel ejection and demolding structure for a screw post according to claim 1, characterized in that, The top of the fixing plate (1) is provided with a groove (15) corresponding to the L-shaped groove (14), the bottom of the L-shaped part (3) extends into the groove (15), the bottom of the L-shaped part (3) abuts against the bottom surface of the groove (15), and a limiting groove (33) is provided at the center of the bottom, and the spring (17) is located in the limiting groove (33).

4. The novel ejection and demolding structure for a screw post according to claim 3, characterized in that, A positioning bolt (16) is threaded onto the groove (15). The positioning bolt (16) includes a threaded part (161) and a smooth part (162). The smooth part (162) is located on one side of the limiting groove (33). The bottom of the limiting groove (33) is provided with a positioning sleeve (34) for positioning and inserting the smooth part (162). The spring (17) is sleeved on the positioning bolt (16), with one end connected to the bottom of the groove (15) and the other end connected to the positioning sleeve (34).

5. The novel ejection and demolding structure for a screw post according to claim 1, characterized in that, The horizontal end of the L-shaped part (3) is provided with a mounting groove (31), and the top of the mounting groove (31) and the side away from the vertical part of the L-shaped part (3) are provided with an opening (32) for inserting the ejector pin (5).

6. The novel ejection and demolding structure for a screw post according to claim 5, characterized in that, The mounting groove (31) is L-shaped, with its horizontal part located below the vertical part. The bottom of the ejector pin (5) is provided with a limiting head (51), and the three side walls, top surface and bottom surface of the limiting head (51) all abut against the inner wall of the horizontal part of the mounting groove (31).

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