Double-limiting plastic mold
The plastic mold with dual limit design solves the problem of insufficient positioning accuracy in the existing technology, realizes high-precision plastic product molding and extends the service life of the mold, and reduces production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KUNSHAN YIJIASHENG ELECTRONIC CO LTD
- Filing Date
- 2025-09-01
- Publication Date
- 2026-08-04
AI Technical Summary
In the field of precision molding, the positioning mechanism of existing plastic molds relies too much on a single guide structure, which leads to large offset errors when molding complex curved surfaces or multi-cavity bodies. This results in obvious parting lines, uneven wall thickness, high defect rates, severe mold wear, decreased positioning accuracy, frequent downtime for adjustment, and increased costs.
The design employs a dual-limiting system, including components such as limit posts, knobs, internal thread blocks, support plates, elastic plates, and limit blocks. Through initial vertical positioning and dual horizontal limiting, it ensures precise alignment between the moving mold and the fixed mold. The elastic plate and springs provide cushioning to prevent positioning loosening caused by rigid collisions and vibrations.
It improves mold closing accuracy and stability, reduces defect rate, extends mold life, reduces downtime for adjustments, and lowers production costs.
Smart Images
Figure CN224588538U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic mold technology, specifically a plastic mold with dual limiting function. Background Technology
[0002] Plastic molds are specialized tools used for the mass production of plastic products. They are mainly used to inject molten plastic into a cavity of a specific shape through processes such as injection molding, and after cooling, the desired product is formed. They are widely used in fields such as electronic and electrical appliance housings, automotive parts, medical devices, and daily necessities packaging, and are core equipment for achieving efficient and precise production of plastic products in modern manufacturing.
[0003] Most plastic molds currently on the market have significant shortcomings in precision molding. Their positioning mechanisms rely too heavily on a single guiding structure, making them prone to misalignment errors when molding complex curved surfaces or multi-cavity bodies. This design flaw directly results in noticeable parting lines and uneven wall thicknesses, leading to persistently high defect rates, especially in the production of high-precision electronic components or medical consumables. More seriously, prolonged use exacerbates mold wear, causing an exponential decline in positioning accuracy. This forces companies to frequently stop for adjustments, wasting raw materials, delaying delivery, and ultimately increasing manufacturing costs. Therefore, we propose a plastic mold with dual-limiting capabilities. Utility Model Content
[0004] The purpose of this invention is to provide a plastic mold with dual-positioning capability, addressing the significant shortcomings of most plastic molds currently on the market in precision molding, as mentioned in the background section. These molds rely too heavily on a single guiding structure for positioning, making them prone to offset errors when molding complex curved surfaces or multi-cavity bodies. This design flaw directly results in noticeable parting lines and uneven wall thickness, leading to high defect rates, especially in the production of high-precision electronic components or medical consumables. More seriously, prolonged use exacerbates mold wear, causing an exponential decline in positioning accuracy. This forces companies to frequently stop for adjustments, wasting raw materials, delaying delivery, and ultimately increasing manufacturing costs.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a plastic mold with dual limiting, comprising a base, a transmission rod disposed at the center of the base, a fixed mold fixedly mounted at the center of the top of the base, a lifting plate disposed at the upper end of the fixed mold, a moving mold fixedly mounted at the center of the bottom of the lifting plate, limiting posts fixedly connected to the four corners of the bottom of the moving mold, a limiting groove No. 1 formed at the four corners of the top of the fixed mold, a knob disposed at the center of one side of the base, and internal thread blocks disposed on both sides of the surface of the transmission rod. Both sides of the upper end are provided with shells. The center of the top of the two internal threaded blocks is fixedly connected to a support plate. The bottom of the two sides of the moving mold and the top of the two sides of the fixed mold are respectively fixedly connected to the No. 2 connecting block and the No. 1 connecting block. The center of the two No. 1 connecting blocks and the two No. 2 connecting blocks on opposite sides is provided with a No. 2 limiting groove. The two shells are symmetrically arranged. An elastic plate is provided on one side of the shell. Springs are fixedly connected to the four corners of one side of the elastic plate. One side of the elastic plate extends through to the outer wall of the shell. Limiting blocks are fixedly connected to the top and bottom of the opposite side of the two elastic plates.
[0006] Compared with the prior art, the beneficial effects of this utility model are: This dual-limit plastic mold, through the design of a transmission rod, a first limiting groove, a limiting post, a knob, an internal threaded block, a support plate, a first connecting block, a second connecting block, a second limiting groove, a housing, a spring, an elastic plate, and a limiting block, achieves initial precise alignment of the moving mold and the fixed mold in the vertical direction by having the limiting post enter the first limiting groove for initial positioning. Subsequently, by rotating the knob, the transmission rod can be rotated. Since the positive and negative threads on both sides of the transmission rod surface are threadedly connected to the positive and negative threaded grooves on the inner walls of the two internal threaded blocks, the two internal threaded blocks move closer to each other under the cooperation of the first sliding groove and the first slider. This, in turn, pushes the housings on both sides toward the center of the mold through the support plate. At this point, the limiting block on the elastic plate will gradually approach and insert into the second limiting groove on the first and second connecting blocks, completing the double positioning. This further restricts the relative position of the moving and fixed molds in the horizontal direction, significantly improving the overall accuracy and stability of the mold closing. During the double positioning process, when the limiting block contacts and inserts into the second limiting groove, the spring will deform appropriately due to the force on the elastic plate, providing a buffer for the positioning process and preventing rigid collisions between the limiting block and the first and second connecting blocks, which could damage the components. At the same time, the elastic restoring force of the spring will continuously apply pressure to ensure that the limiting block is tightly fitted into the second limiting groove, effectively preventing positioning loosening caused by vibration and other factors during mold closing. This ensures the reliability and durability of the double limiting effect, which is beneficial to improving the molding quality of plastic products and extending the service life of the mold. Attached Figure Description
[0007] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 A magnified view of part A in the diagram; Figure 3 This is a three-dimensional structural view of the elastic plate of this utility model; Figure 4 This is the main view of the structure of this utility model.
[0008] In the diagram: 1. Base; 2. Transmission rod; 3. Lifting plate; 4. Fixed mold; 5. Moving mold; 6. No. 1 limiting groove; 7. Limiting post; 8. Knob; 9. Internal thread block; 10. No. 1 sliding groove; 11. No. 1 slider; 12. Groove; 13. Support plate; 14. No. 1 connecting block; 15. No. 2 connecting block; 16. No. 2 limiting groove; 17. Housing; 18. Spring; 19. Elastic plate; 20. No. 2 sliding groove; 21. No. 2 slider; 22. Limiting block. Detailed Implementation
[0009] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0010] Please see Figures 1-4 This utility model provides a technical solution: a plastic mold with dual limiting, including a base 1, a transmission rod 2 centrally located within the base 1, a fixed mold 4 fixedly mounted at the center of the top of the base 1, a lifting plate 3 at the upper end of the fixed mold 4, a movable mold 5 fixedly mounted at the center of the bottom of the lifting plate 3, limiting posts 7 fixedly connected to the four corners of the bottom of the movable mold 5, and a limiting groove 6 formed at the four corners of the top of the fixed mold 4, a knob 8 centrally located on one side of the base 1, and internally threaded blocks 9 on both sides of the surface of the transmission rod 2, and the base 1... Both sides of the end are provided with housings 17. The center of the top of the two internal threaded blocks 9 is fixedly connected to a support plate 13. The bottom of both sides of the moving mold 5 and the top of both sides of the fixed mold 4 are respectively fixedly connected to the second connecting block 15 and the first connecting block 14. The center of the opposite side of the two first connecting blocks 14 and the two second connecting blocks 15 is provided with a second limiting groove 16. The two housings 17 are symmetrically arranged. An elastic plate 19 is provided on one side of the housing 17. Springs 18 are fixedly connected to the four corners of one side of the elastic plate 19. One side of the elastic plate 19 extends through the housing 17.
[0011] The bottom of the moving mold 5 contacts the top of the fixed mold 4. The bottoms of the four limiting posts 7 penetrate into the interior of the four first limiting grooves 6 and contact the inner wall of the first limiting groove 6. The contact between the moving mold 5 and the fixed mold 4 provides a closed cavity for plastic molding. The cooperation between the limiting posts 7 and the first limiting groove 6 can initially limit the moving mold 5 and the fixed mold 4 in the vertical direction at the beginning of mold closing, ensuring that the two are accurately aligned in the vertical position, laying the foundation for subsequent molding.
[0012] One end of the transmission rod 2 is movably connected to a bearing fixedly installed at the center of one side of the base 1. The other end of the transmission rod 2 extends through to the outside of the base 1 and is fixedly connected to the center of one side of the knob 8. The bearing connection allows the transmission rod 2 to rotate flexibly, reducing frictional resistance during rotation. The fixed connection between the transmission rod 2 and the knob 8 allows the operator to easily drive the transmission rod 2 to rotate by rotating the knob 8, thereby transmitting power and providing driving force for the subsequent movement of the internal thread block 9.
[0013] Two internal threaded blocks 9 are respectively connected to the positive and negative threaded grooves on the inner walls of the transmission rod 2 through the positive and negative threaded grooves on their inner walls. A first groove 10 is opened on both sides of the bottom of the base 1. A first slider 11 is fixedly connected to the center of the bottom of the two internal threaded blocks 9. The bottom of the two first sliders 11 extends into the interior of the two first grooves 10 and slides in connection with the inner wall of the first groove 10. The design of the positive and negative threads allows the two internal threaded blocks 9 to move relatively closer or further apart when the transmission rod 2 rotates. The sliding of the first slider 11 in the first groove 10 guides and limits the movement of the threaded blocks, preventing the threaded blocks from rotating with the transmission rod 2 and ensuring that they move stably in a straight line.
[0014] The base 1 has grooves 12 on both sides of its top. The tops of the two support plates 13 extend through the outside of the two grooves 12 and are fixedly connected to the center of the bottom of the two housings 17. The grooves 12 provide space for the movement of the support plates 13, preventing the support plates 13 from interfering with the base 1 when they move with the internal threaded block 9. The support plates 13 connect the internal threaded block 9 and the housing 17, transmitting the movement of the internal threaded block 9 to the housing 17, so that the housing 17 can move synchronously with the movement of the threaded block.
[0015] The tops of the two No. 1 connecting blocks 14 respectively contact the bottoms of the two No. 2 connecting blocks 15. One end of each of the four springs 18 is fixedly connected to the inner wall of the housing 17. The opposite sides of the four limiting blocks 22 on both sides penetrate into the interior of the four No. 2 limiting grooves 16 and contact the inner wall of the No. 2 limiting grooves 16. The front and rear ends of the top and bottom sides of the elastic plate 19 are fixedly connected to the No. 2 sliders 21. The front and rear ends of the top and bottom sides of the housing 17 are provided with No. 2 sliding grooves 20. The tops and bottoms of the four No. 2 sliders 21 arranged vertically extend into the four No. 2 sliding grooves 16. The first slide 20 is slidably connected to the inner wall of the second slide 20. The first connecting block 14 contacts the second connecting block 15, providing a basis for horizontal limiting. The connection of the spring 18 can provide elastic buffer and continuous pressure when the limiting block 22 cooperates with the second limiting groove 16, ensuring the stability of the limiting. The cooperation between the limiting block 22 and the second limiting groove 16 realizes double limiting in the horizontal direction, further improving the mold closing accuracy. The sliding of the second slider 21 in the second slide 20 guides the movement of the elastic plate 19, ensuring that the limiting block 22 can be accurately inserted into the second limiting groove 16.
[0016] The top of the lifting plate 3 is provided with a top plate, and a cylinder is fixedly installed at the center of the upper end of the top plate. The cylinder is fixedly connected to a piston rod through its bottom output end. The bottom of the piston rod extends through to the outside of the top plate and is fixedly connected to the center of the top of the lifting plate 3. Guide pillars are fixedly installed at the four corners of the top of the base 1. The tops of the four guide pillars extend through to the outside of the lifting plate 3 and are fixedly connected to the bottom of the top plate. The cylinder provides power for the lifting plate 3 to rise and fall through the piston rod, realizing the opening and closing action of the moving mold 5. The guide pillars guide the lifting plate 3 to rise and fall, ensuring that the lifting plate 3 remains stable during movement, avoiding the displacement of the moving mold 5, and ensuring the accuracy of the mold closing and opening process.
[0017] Working principle: When mold closing operation is required, the cylinder on the top plate is activated, and the piston rod pushes the lifting plate 3 to move downward along the guide post on the top of the base 1. The moving mold 5 installed at the bottom of the lifting plate 3 moves down accordingly. As the moving mold 5 approaches the fixed mold 4, the limiting post 7 at the four corners of the bottom of the moving mold 5 will accurately align with the first limiting groove 6 at the corresponding position on the top of the fixed mold 4, and gradually penetrate into the first limiting groove 6, contacting the inner wall of the groove, completing the initial vertical limiting. At this time, the bottom of the moving mold 5 is in close contact with the top of the fixed mold 4, forming a closed cavity, which is ready for plastic molding. Then, the double limiting operation in the horizontal direction is performed: the operator rotates the knob 8 on one side of the base 1, and the transmission rod 2 fixedly connected to the knob 8 rotates on the bearing in the base 1. Because the positive and negative threads on both sides of the transmission rod 2 are threadedly connected to the positive and negative thread grooves on the inner walls of the two internal thread blocks 9, and the first slider 11 at the bottom of the internal thread block 9 slides in the first sliding groove 10 at the bottom of the base 1, the two internal thread blocks 9 will move closer to each other under the drive of the transmission rod 2. The support plate 13 at the top of the internal thread block 9 passes through the groove 12 at the top of the base 1, pushing the housings 17 on both sides to move synchronously toward the center of the mold. As the housings 17 move, the elastic plate 19 inside the housings 17 gradually approaches the second connecting block 15 and the first connecting block 14 on both sides of the moving mold 5 and the fixed mold 4, and the limiting block 22 on the elastic plate 19 aligns with the second limiting groove 16 on the connecting block and gradually inserts. During this process, the second sliders 21 at the top and bottom of the elastic plate 19 slide within the second groove 20 inside the housing 17, providing guidance for the movement of the elastic plate 19 and ensuring that the limiting block 22 is accurately inserted into the second limiting groove 16. At the same time, the spring 18 on one side of the elastic plate 19 is compressed and undergoes elastic deformation, providing a buffer for the engagement of the limiting block 22 and the second limiting groove 16, avoiding rigid collisions. Furthermore, the elastic restoring force of the spring 18 will cause the limiting block 22 to fit tightly into the second limiting groove 16, ensuring the stability of the horizontal limiting. This completes the double limiting, ensuring the mold closing accuracy. When the mold is opened, the knob 8 is rotated in the opposite direction, and the transmission rod 2 drives the internal thread block 9, the support plate 13, and the housing 17 to move in the opposite direction. The limiting block 22 exits from the second limiting groove 16, and the spring 18 returns to its original state. Subsequently, the cylinder drives the piston rod to retract, the lifting plate 3 drives the moving mold 5 to rise, and the limiting post 7 is pulled out from the first limiting groove 6, completing the mold opening action.
[0018] In summary, this dual-positioning plastic mold, through the design of transmission rod 2, first limiting groove 6, limiting post 7, knob 8, internal thread block 9, support plate 13, first connecting block 14, second connecting block 15, second limiting groove 16, shell 17, spring 18, elastic plate 19 and limiting block 22, achieves initial precise alignment of moving mold 5 and fixed mold 4 in the vertical direction by limiting post 7 entering first limiting groove 6 for first positioning. Subsequently, by rotating knob 8, transmission rod 2 can be rotated. Since the positive and negative threads on both sides of the transmission rod 2 are threadedly connected to the positive and negative thread grooves on the inner walls of the two internal thread blocks 9, the two internal thread blocks 9 move closer to each other under the cooperation of first sliding groove 10 and first slider 11, and then push the shells 17 on both sides towards the center of the mold through support plate 13. At this time, the limiting block 22 on the elastic plate 19 will gradually approach and insert into the second limiting groove 16 on the first connecting block 14 and the second connecting block 15, completing the double positioning. This further restricts the relative position of the moving mold 5 and the fixed mold 4 in the horizontal direction, greatly improving the overall accuracy and stability of the mold closing. During the double positioning process, when the limiting block 22 contacts and inserts into the second limiting groove 16, the spring 18 will deform appropriately due to the force on the elastic plate 19, providing a buffer for the positioning process and preventing rigid collisions between the limiting block 22 and the first connecting block 14 and the second connecting block 15, which could lead to component damage. At the same time, the elastic restoring force of the spring 18 will continuously apply pressure to ensure that the limiting block 22 is tightly fitted into the second limiting groove 16, effectively preventing positioning loosening caused by vibration and other factors during the mold closing process. This ensures the reliability and durability of the double limiting effect, which is beneficial to improving the molding quality of plastic products and extending the service life of the mold.
[0019] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A plastic mold with dual limiting function, comprising a base (1), characterized in that: A transmission rod (2) is provided in the center of the base (1). A fixed mold (4) is fixedly installed in the center of the top of the base (1). A lifting plate (3) is provided at the upper end of the fixed mold (4). A moving mold (5) is fixedly installed in the center of the bottom of the lifting plate (3). Limiting posts (7) are fixedly connected to the four corners of the bottom of the moving mold (5). A limiting groove (6) is opened in the four corners of the top of the fixed mold (4). A knob (8) is provided in the center of one side of the base (1). Internal thread blocks (9) are provided on both sides of the surface of the transmission rod (2). A housing (17) is provided on both sides of the upper end of the base (1). The center of the top of the two internal thread blocks (9) is provided in the center of the base (1). A support plate (13) is fixedly connected. The bottom of both sides of the moving mold (5) and the top of both sides of the fixed mold (4) are respectively fixedly connected to the second connecting block (15) and the first connecting block (14). The center of the two first connecting blocks (14) and the two second connecting blocks (15) opposite to each other is provided with a second limiting groove (16). The two shells (17) are symmetrically arranged. An elastic plate (19) is provided on one side of the shell (17). Springs (18) are fixedly connected to the four corners of one side of the elastic plate (19). One side of the elastic plate (19) extends through to the outer wall of the shell (17). Limiting blocks (22) are fixedly connected to the top and bottom of the opposite side of the two elastic plates (19).
2. The plastic mold with dual limiting function according to claim 1, characterized in that: The bottom of the moving mold (5) contacts the top of the fixed mold (4), and the bottoms of the four limiting posts (7) penetrate into the interior of the four first limiting grooves (6) and contact the inner wall of the first limiting groove (6).
3. A plastic mold with dual limiting function according to claim 1, characterized in that: One end of the transmission rod (2) is movably connected to a bearing fixedly installed in the center of one side of the base (1), and the other end of the transmission rod (2) extends through to the outside of the base (1) and is fixedly connected to the center of one side of the knob (8).
4. A plastic mold with dual limiting function according to claim 1, characterized in that: Two internal threaded blocks (9) are respectively connected to the positive and negative threaded grooves on the inner wall of the transmission rod (2) through the positive and negative threaded grooves respectively. A first slide groove (10) is opened on both sides of the bottom of the base (1). A first slider (11) is fixedly connected to the center of the bottom of the two internal threaded blocks (9). The bottom of the two first sliders (11) extends into the interior of the two first slide grooves (10) and slides in connection with the inner wall of the first slide groove (10).
5. A plastic mold with dual limiting function according to claim 1, characterized in that: The base (1) has grooves (12) on both sides of its top. The tops of the two support plates (13) extend through the outside of the two grooves (12) and are fixedly connected to the center of the bottom of the two shells (17).
6. A plastic mold with dual limiting function according to claim 1, characterized in that: The tops of the two No. 1 connecting blocks (14) are in contact with the bottoms of the two No. 2 connecting blocks (15) respectively. One end of each of the four springs (18) is fixedly connected to the inner wall of the housing (17). The opposite side of the four limiting blocks (22) set on both sides passes through the interior of the four No. 2 limiting grooves (16) and contacts the inner wall of the No. 2 limiting grooves (16). The front and rear ends of the top and bottom sides of the elastic plate (19) are fixedly connected with the No. 2 sliders (21). The front and rear ends of the top and bottom sides of the housing (17) are provided with the No. 2 sliding grooves (20). The top and bottom of the four No. 2 sliders (21) set up above and below extend into the interior of the four No. 2 sliding grooves (20) and slide in contact with the inner wall of the No. 2 sliding grooves (20).
7. A plastic mold with dual limiting function according to claim 1, characterized in that: The top of the lifting plate (3) is provided with a top plate, and a cylinder is fixedly installed at the center of the upper end of the top plate. The cylinder is fixedly connected to a piston rod through its bottom output end. The bottom of the piston rod extends through to the outside of the top plate and is fixedly connected to the center of the top of the lifting plate (3). Guide columns are fixedly installed at the four corners of the top of the base (1). The tops of the four guide columns extend through to the outside of the lifting plate (3) and are fixedly connected to the bottom of the top plate.