Lateral self-locking core-pulling structure
By introducing a self-locking mechanical structure into the core-pulling structure, and utilizing the cooperation of the hydraulic cylinder fixing block and locking block, the problem of the ordinary hydraulic cylinder retraction is solved, achieving a low-cost and high-precision core-pulling effect.
Patent Information
- Application Number
- CN202520523565.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-25
AI Technical Summary
In the existing technology, ordinary reversing cylinders are prone to backing up when injection molding products with large projected area, resulting in product steps or differences, and foreign self-locking cylinders are expensive.
A self-locking mechanical structure is added to the core-pulling structure. Through the cooperation of the hydraulic cylinder fixing block and the locking block, the sliding block assembly is self-locked to prevent backward movement during the injection molding process.
It effectively avoids the sliding block from moving backward during injection molding, reduces costs, and improves control precision and the reliability of the core-pulling structure.
Smart Images
Figure CN223864228U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive injection molds, specifically relating to a side-locking core-pulling structure. Background Technology
[0002] A typical reversing core-pulling structure is a core-pulling structure driven by a hydraulic cylinder, such as... Figure 1 As shown, the hydraulic cylinder reversing method involves connecting the hydraulic cylinder to a sliding block. The guide rail on the bottom of the sliding block has an angled T-shaped sliding groove, and the core puller is connected to this T-shaped sliding groove to complete the core pulling process. When the product has a large undercut and a large projected area, this method is suitable. The design of the reversing method requires calculating the size of the hydraulic cylinder based on the product's undercut and projected area. If the product's projected area is too large, it will lead to excessive injection pressure. In this case, a regular reversing hydraulic cylinder may not be able to lock properly, causing the cylinder to retract during injection, resulting in steps or discrepancies in the product, ultimately rendering the product unusable. Using imported self-locking hydraulic cylinders is expensive, representing a significant expense. Utility Model Content
[0003] To address the aforementioned problems in the existing technology, this utility model provides a lateral self-locking core-pulling structure, which adds a self-locking mechanical structure to the core-pulling structure, thus preventing the core from retracting due to high pressure during injection molding.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a lateral self-locking core-pulling structure, comprising a core puller, a sliding block assembly, a locking block, a pressure strip, a hydraulic cylinder, and a hydraulic cylinder fixing block. The locking block is movably installed on both sides of the rear of the sliding block assembly and moves left and right there therein. One end of the hydraulic cylinder fixing block is movably installed in the middle of the rear of the sliding block assembly, and the other end is connected to the hydraulic cylinder. One end of the hydraulic cylinder fixing block moves back and forth in the middle of the rear of the sliding block assembly. The pressure strip is disposed on both sides of the sliding block assembly, and a locking surface adapted to the locking block is provided on the inner side of the pressure strip. One end of the core puller is movably installed on... As the sliding block assembly moves horizontally backward, the core puller 2 moves obliquely upward. When self-locking is required, the hydraulic cylinder pushes the hydraulic cylinder fixing block forward, causing it to press against one side of the sliding block assembly. During this process, the locking block is driven by the front side of the hydraulic cylinder fixing block into the locking surface on the pressure bar, thereby achieving self-locking. When unlocking is required, the hydraulic cylinder pulls the hydraulic cylinder fixing block backward, causing it to contact the other side of the sliding block assembly. At this time, the hydraulic cylinder continues to pull backward, and the sliding block assembly is moved backward along with it. During this process, the locking surface squeezes the locking block inward, thereby unlocking.
[0005] Furthermore, the sliding block assembly includes a sliding block one and a sliding block two fixed behind the sliding block one. The sliding block one and the sliding block two have the same width and both have protrusions at the bottom on both sides. The pressure strip contacts the top of the bottom protrusions of the sliding block one and the sliding block two. The sliding block two has a U-shaped groove one at the front and a U-shaped groove two at the rear. The length, width and depth of the U-shaped groove one are larger than those of the U-shaped groove two. The end of the cylinder fixing block one is located in the U-shaped groove one, and the other end of the cylinder fixing block is connected to the cylinder after passing through the U-shaped groove two. The end of the cylinder fixing block one moves back and forth in the U-shaped groove one. The cylinder fixing block has inclined surfaces on both sides at the front end.
[0006] Furthermore, the length of the U-shaped groove is d greater than the length of one end of the cylinder fixing block, where d is 10mm.
[0007] Furthermore, hollow grooves adapted to the locking block are provided in the middle of both sides of the U-shaped groove on the sliding block 2. Through holes are provided on both sides of the sliding block 2 along the sliding direction and the through holes pass through the hollow grooves. A transverse oval hole is provided in the middle of the locking block. A movable limiting pin is provided in the oval hole and the limiting pin is also inserted into the through hole. The transverse distance of the oval hole is larger than the diameter of the limiting pin by 'a', where 'a' is 3mm.
[0008] Furthermore, a T-shaped sliding groove with a forward and upward tilt is provided at the bottom of the sliding block, and one end of the core puller is installed in the T-shaped sliding groove, with a guide sleeve sleeved on the outer side of the core puller.
[0009] Furthermore, a limit block 1 is provided in front of the sliding block 1, and a limit block 2 is provided behind the sliding block 2.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model installs a locking block and a hydraulic cylinder fixing block with a beveled front end on the sliding block two, and sets a locking surface on the inner side of the pressure strip, so that the beveled front end of the hydraulic cylinder fixing block squeezes the locking block into the locking surface, so that the sliding block two and the sliding block one are locked by the locking block, avoiding the situation of backward movement due to high pressure during the injection molding process; the sliding block one and the sliding block two of this utility model are designed as separate parts, which are convenient for disassembly, assembly, and fitting, and have high control precision; this utility model also sets a separate limiting pin, which is beneficial for limiting the locking block, and the mechanical self-locking structure will not fail. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the existing technology structure;
[0012] Figure 2 Side sectional view of existing technology
[0013] Figure 3 This is an exploded view of the present utility model and the product;
[0014] Figure 4 This is a top view of the present invention when it is installed on the product;
[0015] Figure 5 for Figure 4 Sectional view at point AA;
[0016] Figure 6 for Figure 5 Sectional view at point BB;
[0017] Figure 7 for Figure 6 Enlarged view at point C;
[0018] Figure 8 This is a top view of the completed core-pulling process of this utility model;
[0019] Figure 9 for Figure 8 Sectional view at point DD;
[0020] Figure 10 for Figure 9 Sectional view at EE;
[0021] Figure 11 for Figure 10 Enlarged view of point F in the middle. Detailed Implementation
[0022] 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.
[0023] Please see Figure 1-2 In the existing technology, the reversing core-pulling structure is that the hydraulic cylinder 11 is connected to the sliding block 4 and drives the sliding block 4 to slide horizontally backward. Then, the bottom surface of the sliding block 4 is connected to the core 2. The bottom surface of the sliding block 4 is provided with a guide rail, and the guide rail is designed with an angled T-shaped groove. The top of the core 2 is movably connected in the T-shaped groove. The core 2 itself is inclined and one end is connected to the undercut 11 of the product 1. When the sliding block 4 moves horizontally backward, the core 2 slides relatively in the T-shaped groove. Since the T-shaped groove is angled, the height of the T-shaped groove gradually increases, thereby driving the core 2 to disengage obliquely upward from the undercut 11. When the undercut 11 of product 1 is large and the projected area is large, continuing to use this form would require a larger hydraulic cylinder 11, which would increase costs. If a regular hydraulic cylinder 11 is still chosen, the large injection force during product 1 injection would cause the hydraulic cylinder 11 to retract, resulting in steps or discrepancies in product 1, rendering product 1 unusable. Using a foreign self-locking hydraulic cylinder 11 would be expensive, also a significant expense. Therefore, there is an urgent need to develop a low-cost structure that only requires a regular core-pulling 11 to reduce costs.
[0024] Please see Figure 3-11 This utility model provides the following technical solution: a lateral self-locking core-pulling structure, including a core-pulling block 2, a sliding block assembly, a locking block 6, a pressure strip 8, a hydraulic cylinder 11, and a hydraulic cylinder fixing block 12. Two locking blocks 6 and two pressure strips 8 are provided. The two locking blocks 6 are movably installed on both sides of the rear of the sliding block assembly and move left and right within it. One end of the hydraulic cylinder fixing block 12 is movably installed in the middle of the rear of the sliding block assembly, and the other end is connected to the hydraulic cylinder 11. The hydraulic cylinder fixing block 12 passes through the rear of the sliding block assembly in the front-back direction. The two sides of one end of the hydraulic cylinder fixing block 12 contact one side of each of the two locking blocks 6. One end of the hydraulic cylinder fixing block 12 moves back and forth in the middle of the rear of the sliding block assembly. Two pressure strips 8 are respectively provided on both sides of the sliding block assembly, and the inner side of the pressure strip 8 has a locking surface 81 adapted to the locking block 6. The locking surface 81 is recessed into the pressure strip 8, and the end of the locking block 6 can be inserted into the locking surface 81. One end of the core-pulling block 2... The movable part is installed on the lower front side of the sliding block assembly. As the sliding block assembly moves horizontally backward, the core puller 2 moves obliquely upward. When self-locking is required, the hydraulic cylinder 11 pushes the hydraulic cylinder fixing block 12 forward, so that it hits one side of the sliding block assembly. During this process, the two locking blocks 6 are driven by the front sides of the hydraulic cylinder fixing block 12 on both sides and pushed into the locking surfaces 81 on the pressure strips 8 on both sides. The locking blocks 6 lock the sliding block assembly, and the sliding block assembly cannot move back and forth. Even if the injection force is large when the product 1 is injected, the injection force cannot push the core puller 2, the sliding block assembly and the hydraulic cylinder 11 to move, thus achieving self-locking. When unlocking is required, the hydraulic cylinder 11 pulls the hydraulic cylinder fixing block 12 backward, so that it contacts the other side of the sliding block assembly. At this time, the hydraulic cylinder 11 continues to pull backward, and the sliding block assembly is moved backward together. During this process, the locking surfaces 81 squeeze the locking blocks 6 and move them inward. The locking blocks 6 move into the sliding block assembly and no longer hinder the movement of the sliding block assembly, thus unlocking.
[0025] Specifically, the sliding block assembly includes a first sliding block 4 and a second sliding block 5 fixed behind the first sliding block 4. The first sliding block 4 and the second sliding block 5 have the same width and both have protrusions at their bottom sides. Two pressure strips 8 contact the top of the bottom protrusions on both sides of the first sliding block 4 and the second sliding block 5, allowing the first sliding block 4 and the second sliding block 5 to move horizontally backward. The second sliding block 5 has a U-shaped groove 53 at its front and a U-shaped groove 54 at its rear. The first U-shaped groove 53 is larger in length, width, and depth than the second U-shaped groove 54. The first U-shaped groove 53 is an extension of the second U-shaped groove 54 in length, width, and depth. One end of the cylinder fixing block 12 is located in the first U-shaped groove 53, and the cylinder fixing block 12 passes through the second U-shaped groove 54. The other end of 54 is connected to the hydraulic cylinder 11. One end of the hydraulic cylinder fixing block 12 moves back and forth in the U-shaped groove 53, and the width and height of one end of the hydraulic cylinder fixing block 12 are greater than the width and depth of the U-shaped groove 54. When one end of the hydraulic cylinder fixing block 12 moves to the rear side in the U-shaped groove 53, it is blocked by the sliding block 5 at the U-shaped groove 54. The front end of the hydraulic cylinder fixing block 12 is provided with inclined surfaces 121 on both sides. The inclined surfaces 121 are designed to squeeze one end of the locking block 6 when self-locking. In addition, the sliding block 4 and the sliding block 5 are separate, which is convenient for disassembly and assembly, and also convenient for fitting. The sliding block 4 and the sliding block 5 are designed to match the undercut 11 and the core pull 11 on the product 1, and the control precision is high.
[0026] Specifically, the length of the U-shaped groove 53 is d greater than the length of one end of the cylinder fixing block 12, where d is 10mm. One end of the cylinder fixing block 12 can move forward or backward 10mm in the U-shaped groove 53.
[0027] Specifically, hollow grooves 51 adapted to the locking blocks 6 are provided in the middle of the two sides of the U-shaped groove 53 on the sliding block 2 5. The two locking blocks 6 are movably installed in the hollow grooves 51 on both sides. The left and right length of the locking blocks 6 is longer than the left and right length of the hollow grooves 51. When the locking blocks 6 are pushed into the sliding block 2 5, one end of the locking blocks 6 protrudes into the U-shaped groove 53. Through holes 52 are provided on both sides of the sliding block 2 5 along the sliding direction and pass through the hollow grooves 51. The locking block 6 has a transverse oblong hole 61 in the middle. A movable limiting pin 7 is provided in the oblong hole 61 and is also inserted into the through hole 52. There are two limiting pins 7. The transverse distance of the oblong hole 61 is larger than the diameter of the limiting pin 7 by 'a', where 'a' is 3mm. After the limiting pin 7 and the locking block 6 are installed on the sliding block 2 5, the locking block 6 can move 3mm to the left and right. The locking block 6 is limited in the left and right directions by the limiting pin 7 to prevent the locking block 6 from failing after moving.
[0028] Specifically, the bottom of the sliding block 4 has a T-shaped sliding groove that is inclined forward and upward. One end of the pull core 2 is installed in the T-shaped sliding groove, and the other end is connected to the buckle 11 in the product 1. The pull core 2 itself is inclined and in the same direction as the buckle 11. When the sliding block 4 moves backward horizontally, the pull core 2 slides relatively in the T-shaped sliding groove. Since the T-shaped sliding groove is inclined forward and upward, the height of the T-shaped sliding groove gradually increases, thereby driving the pull core 2 to disengage from the buckle 11 at an angle upward. A guide sleeve 3 is sleeved on the outer side of the pull core 2. The guide sleeve 3 has the function of guiding and lubricating the pull core 2 to prevent damage to the pull core 2.
[0029] Specifically, a limit block 9 is provided in front of the sliding block 4. When it is self-locking, the front side of the sliding block 4 is blocked by the limit block 9, and one end of the core pull 2 is connected to the undercut 11. This is the position of the sliding block 4 when the product 1 is being injected. A limit block 10 is provided behind the sliding block 5. When it is unlocked, the sliding block 4 and the sliding block 5 are pulled backward by the hydraulic cylinder 11 through the hydraulic cylinder fixing block 12. The sliding block 5 is then limited by the limit block 10. At this time, one end of the core pull 2 is driven out of the undercut 11 by the sliding block 4.
[0030] The installation and movement process of this utility model is as follows: First, install the guide sleeve 3 into the front mold, then install the two locking blocks 6 into the hollow grooves 51 on both sides of the sliding block 2 5, then insert the two limiting pins 7 into the through holes 52 on both sides respectively, while the limiting pins 7 pass through the oval holes 61 on the locking block 6. In this way, the limiting pins 7 limit and fix the locking block 6. Then, use screws to fix the sliding block 2 5 and the sliding block 1 4 together. Next, install the core puller 2 into the sliding block 1 4 through the T-shaped slide groove, and then install the front... The parts are installed together into the front mold and fixed with pressure strip 8. Pressure strip 8 is in contact with the protrusions on both sides of the bottom of sliding block 4 and sliding block 5. At this time, core pull 2 passes through guide sleeve 3. Then limit block 9 and limit block 10 are fixed to the front mold. Finally, after fixing one end of cylinder fixing block 12 to cylinder 11, one end of cylinder fixing block 12 is inserted into U-shaped groove 53 in sliding block 5. Then cylinder fixing block 12 passes through U-shaped groove 54. In this way, they are installed into the front mold together. Mold Action: When in the locked state, the hydraulic cylinder 11 and the hydraulic cylinder fixing block 12 move backward together. The hydraulic cylinder fixing block 12 moves backward 10mm within the U-shaped groove 53 of the sliding block 2. When the hydraulic cylinder fixing block 12 contacts the rear wall of the U-shaped groove 53, it drives the sliding block 4 and the sliding block 2 to move backward together. The backward movement of the sliding block 4 drives the core pull 2 to move obliquely upward, thereby completing the core pull action and removing the undercut 11 from the product 1. During this process, the locking block 6 is initially located in the locking surface 81 of the pressure strip 8. Since the hydraulic cylinder fixing block 12 has moved 10mm, the hydraulic cylinder fixing block 12 still has a tendency to move backward. As the hydraulic cylinder fixing block 12 drives the sliding block 4 and the sliding block 2 to move backward, the locking block 6 is laterally moved 3mm by the pressure of the oblique surface of the locking surface 81 on the pressure strip 8. At this point, the core pull no longer plays a locking role. During injection molding, the hydraulic cylinder 11 and the hydraulic cylinder fixing block 12 move forward together. The hydraulic cylinder fixing block 12 moves forward 10mm in the U-shaped groove 53 of the sliding block 2 5, and then the hydraulic cylinder fixing block 12 contacts the rear of the sliding block 4. During the forward movement of the hydraulic cylinder fixing block 12 by 10mm, the hydraulic cylinder fixing block 12 drives the two locking blocks 6 to move laterally by 3mm through the inclined surfaces 121 on both sides of the front end, thereby locking the locking blocks 6 in the locking surface 81 on the pressure strip 8, thus playing a mechanical self-locking role.
[0031] When the core-pulling and clamping of product 1 is faulty and the mold space is tight, a smaller diameter oil cylinder 11 can be selected. By adopting this utility model, backward movement during injection molding can be avoided, ensuring the consistency of the core-pulling and clamping state. It can also solve the problem of occupying mold space and reduce processing and procurement costs.
[0032] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A side-acting self-locking core-drawing structure, characterized in that, The core-pulling device (2), the sliding block assembly, the locking block (6), the pressing strip (8), the oil cylinder (11) and the oil cylinder fixing block (12) are included, the locking block (6) is movably installed in the rear of the sliding block assembly and moves left and right in it, one end of the oil cylinder fixing block (12) is movably installed in the middle of the rear of the sliding block assembly, the other end is connected with the oil cylinder (11), one end of the oil cylinder fixing block (12) moves back and forth in the middle of the rear of the sliding block assembly, the pressing strip (8) is arranged on the two sides of the sliding block assembly, and the inner side of the pressing strip (8) is provided with a locking surface (81) matched with the locking block (6), one end of the core-pulling device (2) is movably installed in the lower side of the front of the sliding block assembly, and the core-pulling device (2) moves obliquely upward as the sliding block assembly horizontally retreats, when self-locking is needed, the oil cylinder (11) pushes the oil cylinder fixing block (12) forward, so that the oil cylinder fixing block (12) is pushed to one side of the sliding block assembly, in this process, the locking block (6) is driven by the front side of the oil cylinder fixing block (12) and is pushed into the locking surface (81) on the pressing strip (8), so that self-locking is realized; when unlocking is needed, the oil cylinder (11) pulls the oil cylinder fixing block (12) backward, so that the oil cylinder fixing block (12) contacts the other side of the sliding block assembly, at this time, the oil cylinder (11) continues to pull backward, the sliding block assembly is driven to move backward, in this process, the locking surface (81) extrudes the locking block (6) to move inward, so that unlocking is realized.
2. A side self-locking core-drawing structure according to claim 1, characterized in that, The sliding block assembly includes the sliding block one (4) and the sliding block two (5) fixed behind the sliding block one (4), the sliding block one (4) and the sliding block two (5) are consistent in width and are provided with protrusions on the bottoms of the two sides, the pressing strip (8) contacts the upper surfaces of the protrusions on the bottoms of the sliding block one (4) and the sliding block two (5), the sliding block two (5) is provided with a U-shaped groove one (53) in the front middle and a U-shaped groove two (54) in the rear, the U-shaped groove one (53) is larger than the U-shaped groove two (54) in length, width and depth, one end of the oil cylinder fixing block (12) is located in the U-shaped groove one (53), the oil cylinder fixing block (12) passes through the U-shaped groove two (54) and is connected with the oil cylinder (11) at the other end, one end of the oil cylinder fixing block (12) moves back and forth in the U-shaped groove one (53), and inclined surfaces (121) are arranged on the two sides of the front end of the oil cylinder fixing block (12).
3. A side self-locking core-drawing structure according to claim 2, characterized in that, The length of the U-shaped groove one (53) is larger than the length of one end of the oil cylinder fixing block (12) by d, and d is 10 mm.
4. A side self-locking core-drawing structure according to claim 3, characterized in that, Hollow grooves (51) matched with the locking block (6) are arranged in the middle of the two sides of the U-shaped groove one (53) on the sliding block two (5), through holes (52) are arranged on the two sides of the sliding block two (5) in the sliding direction and pass through the hollow grooves (51), a transverse waist round hole (61) is arranged in the middle of the locking block (6), a movable limiting pin (7) is arranged in the waist round hole (61), and the limiting pin (7) is also inserted into the through hole (52), and the transverse distance of the waist round hole (61) is larger than the diameter of the limiting pin (7) by a, and a is 3 mm.
5. A side self-locking core-drawing structure according to claim 4, characterized in that, The bottom of the sliding block one (4) is provided with a T-shaped sliding groove which is inclined forward and upward, and the core pulling (2) is installed in the T-shaped sliding groove, and the outer side surface of the core pulling (2) is sleeved with a guide sleeve (3).
6. A side self-locking core-drawing structure according to claim 5, characterized in that, The front of the sliding block one (4) is provided with a limiting block one (9), and the rear of the sliding block two (5) is provided with a limiting block two (10).