Lateral self-locking core-pulling structure
By adding a self-locking mechanical structure to the core pulling structure, and using the combination of locking blocks and pressing strips, self-locking of the oil cylinder during injection molding is achieved, solving the product quality problems caused by the oil cylinder retraction in the prior art, and reducing costs.
Patent Information
- Application Number
- CN202510352284.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2025-05-23
AI Technical Summary
During the injection molding process, the existing reversing core pulling structure causes the cylinder to retreat due to high pressure, resulting in product steps and stages, and the self-locking cylinder is expensive.
A lateral self-locking core pulling structure is designed. By adding a self-locking mechanical structure to the core pulling structure, including locking blocks, pressing strips, oil cylinders and cylinder fixing blocks, the oblique surface of the cylinder fixing block is used to drive the locking block into the locking surface of the pressure bar, realizing self-locking, and limiting the locking blocks through limit pins.
It effectively avoids the situation of backward due to large pressure during injection molding, ensures product quality, reduces costs, and designs split sliding block components to facilitate disassembly and assemble and have high control accuracy.
Smart Images
Figure CN120023982A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of automobile injection molds, and in particular relates to a lateral self-locking core-pulling structure. Background Art
[0002] The usual reversing core pulling structure is a core pulling structure driven by a cylinder, such as Figure 1 As shown, the cylinder reversing form is that the cylinder is connected to the sliding block, and the guide rail on the bottom of the sliding block is provided with an angled T-shaped sliding groove, and the core pulling is connected to the T-shaped sliding groove, so as to complete the core pulling. When the product has a large undercut and a large projected area, this form is adopted. The design of the reversing form needs to calculate the size of the selected cylinder according to the undercut and the projected area of the product. When the projected area of the product is too large, the injection pressure will be too high, and then the ordinary reversing cylinder will not be able to lock. Then, during injection molding, the cylinder will retreat, causing steps and step differences in the product, and the product will be scrapped; if a foreign self-locking cylinder is used, it is expensive and it is also a considerable expense. Summary of the invention
[0003] In order to solve the above problems existing in the prior art, the present invention provides a lateral self-locking core-pulling structure, which adds a self-locking mechanical structure on the basis of the core-pulling structure to avoid the backward movement due to high pressure during the injection molding process.
[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lateral self-locking core-pulling structure, comprising a core-pulling, a sliding block assembly, a locking block, a pressure strip, a cylinder and a cylinder fixing block, wherein the locking block is movably mounted on both sides of the rear of the sliding block assembly and moves left and right therein, one end of the cylinder fixing block is movably mounted in the middle of the rear of the sliding block assembly and the other end is connected to the cylinder, one end of the cylinder fixing block moves forward and backward in the middle of the rear of the sliding block assembly, the pressure strips are arranged on both sides of the sliding block assembly and the inner side of the pressure strips is provided with a locking surface adapted to the locking block, one end of the core-pulling is movably mounted on the sliding block assembly The core pulling 2 moves obliquely upward in the lower front side of the moving block assembly as the sliding block assembly retreats horizontally. When self-locking is required, the oil cylinder pushes the oil cylinder fixing block forward to make it press against one side of the sliding block assembly. During this process, the locking block is driven by the front side of the oil cylinder fixing block to press into the locking surface on the pressure strip, thereby achieving self-locking. When unlocking is required, the oil cylinder pulls the oil cylinder fixing block backward to make it contact the other side of the sliding block assembly. At this time, the oil cylinder continues to pull backward, and the sliding block assembly is driven backward together. During this process, the locking surface squeezes the locking block to move inward, thereby unlocking.
[0005] Furthermore, the sliding block assembly includes a sliding block 1 and a sliding block 2 fixed behind the sliding block 1. The sliding block 1 and the sliding block 2 have the same width and are both provided with protrusions at the bottom of both sides. The pressure strip contacts the upper side of the protrusions at the bottom of the sliding block 1 and the sliding block 2. A U-shaped groove 1 is provided at the middle front part of the sliding block 2 and a U-shaped groove 2 is provided at the rear part. The length, width and depth of the U-shaped groove 1 are larger than those of the U-shaped groove 2. One end of the cylinder fixing block is located in the U-shaped groove 1 and the other end of the cylinder fixing block is connected to the cylinder after passing through the U-shaped groove 2. One end of the cylinder fixing block moves back and forth in the U-shaped groove 1, and inclined surfaces are provided on both sides of the front end of the cylinder fixing block.
[0006] Furthermore, the length of the U-shaped groove is greater than the length of one end of the oil cylinder fixing block by d, and d is 10 mm.
[0007] Furthermore, hollow grooves matching the locking block are opened in the middle of both sides of the U-shaped groove 1 on the sliding block 2, through holes are opened on both sides of the sliding block 2 along the sliding direction and the through holes pass through the hollow grooves, and a transverse waist-shaped hole is opened in the middle of the locking block, a movable limit pin is arranged in the waist-shaped hole and the limit pin is also inserted in the through hole, and the transverse distance of the waist-shaped hole is larger than the diameter of the limit pin by a, and a is 3mm.
[0008] Furthermore, a T-shaped sliding groove inclined upward and forward is provided at the bottom of the sliding block, one end of the core pulling is installed in the T-shaped sliding groove, and a guide sleeve is sleeved on the outer side of the core pulling.
[0009] Furthermore, a limiting block 1 is arranged in front of the sliding block 1, and a limiting block 2 is arranged behind the sliding block 2.
[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention installs a locking block and a cylinder fixing block with an inclined surface at the front end on the sliding block 2, and arranges a locking surface on the inner side surface of the pressure strip, so that the inclined surface at the front end of the cylinder fixing block squeezes the locking block into the locking surface, so that the sliding block 2 and the sliding block 1 are locked by the locking block, avoiding the situation of retreat due to high pressure during the injection molding process; the sliding block 1 and the sliding block 2 of the present invention are designed to be separate, which is convenient for disassembly and assembly, grinding and matching, and has high control accuracy; the present invention further arranges a separate limit pin, which is conducive to limiting the locking block, and the mechanical self-locking structure will not fail. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the prior art structure;
[0012] Figure 2 A side sectional view of the prior art
[0013] Figure 3 This is an exploded diagram of the present invention and product;
[0014] Figure 4 A top view of the present invention when installed on a product;
[0015] Figure 5 for Figure 4 Sectional view at AA;
[0016] Figure 6 for Figure 5 Sectional view at the middle BB;
[0017] Figure 7 for Figure 6 Enlarged view of point C in the middle;
[0018] Figure 8 It is a top view of the present invention when the core pulling is completed;
[0019] Fig. 9 for Figure 8 Sectional view at DD in the middle;
[0020] Fig.10 for Fig. 9 Sectional view at EE;
[0021] Fig.11 for Fig.10 Enlarged view of point F in the middle. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] See also Figure 1-2 The reversing core pulling structure in the prior art is that the oil cylinder 11 is connected to the sliding block 4 and drives the sliding block 4 to slide horizontally backward, and then the bottom surface of the sliding block 4 is connected to the core pulling 2. The bottom surface of the sliding block 4 is provided with a guide rail, and an angled T-shaped slide groove is designed on the guide rail. The top of the core pulling 2 is movably connected in the T-shaped slide groove. The core pulling 2 itself is oblique and one end is connected to the undercut 11 of the product 1. When the sliding block 4 retreats horizontally, the core pulling 2 slides relatively in the T-shaped slide groove. Since the T-shaped slide groove is angled, the height of the T-shaped slide groove gradually increases, thereby driving the core pulling 2 to disengage from the undercut 11 obliquely upward. When the undercut 11 of product 1 is large and the projected area is large, if this form is continued, a larger oil cylinder 11 needs to be selected, but this will increase the cost; if the ordinary oil cylinder 11 is still selected, the oil cylinder 11 will retreat due to the large injection force during the injection of product 1, resulting in steps and steps of product 1, making product 1 scrapped; if the foreign self-locking oil cylinder 11 is used, it is expensive and also a considerable expense. Therefore, it is urgent to develop a low-priced structure that only requires ordinary core pulling 11 to reduce costs.
[0024] See also Figure 3-11 The present invention provides the following technical scheme: a lateral self-locking core-pulling structure, comprising a core-pulling 2, a sliding block assembly, a locking block 6, a pressure strip 8, a cylinder 11 and a cylinder fixing block 12, wherein the locking block 6 and the pressure strip 8 are both set as two, and the two locking blocks 6 are respectively movably mounted on both sides of the rear of the sliding block assembly and move left and right therein, one end of the cylinder fixing block 12 is movably mounted in the middle of the rear of the sliding block assembly, and the other end is connected to the cylinder 11, and the cylinder fixing block 12 passes through the rear of the sliding block assembly in the front-to-back direction, and the two side surfaces at one end of the cylinder fixing block 12 are respectively in contact with one side of the two locking blocks 6, and one end of the cylinder fixing block 12 moves forward and backward in the middle of the rear of the sliding block assembly, and the two pressure strips 8 are respectively arranged on both sides of the sliding block assembly and the inner side of the pressure strip 8 is provided with a locking surface 81 adapted to the locking block 6, the locking surface 81 is recessed into the interior of the pressure strip 8, and the end of the locking block 6 can be stuck in the locking surface 81, and the core-pulling 2 is movably mounted on both sides of the rear of the sliding block assembly When the oil cylinder 11 is in a state of being moved backward, the oil cylinder 11 pushes the oil cylinder fixing block 12 forward to make it hit one side of the upper part of the sliding block assembly. In this process, the two locking blocks 6 are respectively driven by the front side surfaces on both sides of the oil cylinder fixing block 12 to hit the locking surfaces 81 on the pressure strips 8 on both sides. The locking block 6 locks the sliding block assembly and the sliding block assembly cannot move forward or backward. Even if the injection molding force is large during the injection molding of the product 1, the injection molding force cannot push the core pulling 2, the sliding block assembly and the oil cylinder 11 to move, thereby realizing self-locking; when unlocking is required, the oil cylinder 11 pulls the oil cylinder fixing block 12 backward to make it contact the other side of the sliding block assembly. At this time, the oil cylinder 11 continues to pull backward, and the sliding block assembly is driven backward together. In this process, the locking surface 81 squeezes the locking block 6 to move inward, and the locking block 6 moves into the sliding block assembly and no longer hinders the movement of the sliding block assembly, thereby unlocking.
[0025] Specifically, the sliding block assembly includes a sliding block 4 and a sliding block 2 5 fixed behind the sliding block 1 4. The sliding block 1 4 and the sliding block 2 5 have the same width and are both provided with protrusions at the bottom of both sides. The two pressure strips 8 are respectively in contact with the upper surfaces of the protrusions at the bottom of the sliding block 1 4 and the sliding block 2 5 on both sides, so that the sliding block 1 4 and the sliding block 2 5 can retreat horizontally. A U-shaped groove 1 53 is provided at the front middle part of the sliding block 2 5 and a U-shaped groove 2 54 is provided at the rear. The length, width and depth of the U-shaped groove 1 53 are larger than those of the U-shaped groove 2 54. The length, width and depth of the U-shaped groove 1 53U are increased forward on the basis of the U-shaped groove 2 54. One end of the oil cylinder fixing block 12 is located in the U-shaped groove 1 53 and the oil cylinder fixing block 12 passes through the U-shaped groove 2 The other end of the rear end is connected to the cylinder 11, and one end of the cylinder fixing block 12 moves back and forth in the U-shaped groove 53, and the width and height of one end of the cylinder fixing block 12 are larger than the width and depth of the U-shaped groove 54. When one end of the 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. Inclined surfaces 121 are set on both sides of the front end of the cylinder fixing block 12. The inclined surfaces 121 are set to squeeze one end of the locking block 6 when self-locking. In addition, the sliding block 4 and the sliding block 5 are separated, which is convenient for disassembly and assembly on the one hand, and convenient for research and matching on the other hand. The sliding block 4 and the sliding block 5 that are compatible with the undercut 11 and the core pulling 11 on the product 1 are designed, and the control accuracy is high.
[0026] Specifically, the length of the U-shaped groove 53 is greater than the length of one end of the cylinder fixing block 12 by d, where d is 10 mm. The end of the cylinder fixing block 12 can move forward or backward by 10 mm in the U-shaped groove 53.
[0027] Specifically, hollow grooves 51 adapted to the locking blocks 6 are provided in the middle of both sides of the U-shaped groove 1 53 on the sliding block 2 5, and the two locking blocks 6 are movably installed in the hollow grooves 51 on both sides, respectively. The left and right lengths of the locking blocks 6 are longer than the left and right lengths of the hollow grooves 51. When the locking blocks 6 are pushed into the inside of the sliding block 2 5, one end of the locking blocks 6 protrudes from the U-shaped groove 1 53. Through holes 52 are provided on both sides of the sliding block 2 5 along the sliding direction, and the through holes 52 pass through the hollow grooves 51. A transverse waist-shaped hole 61 is opened in the middle of the locking block 6, and a movable limit pin 7 is arranged in the waist-shaped hole 61 and the limit pin 7 is also inserted in the through hole 52. There are also two limit pins 7. The transverse distance of the waist-shaped hole 61 is larger than the diameter of the limit pin 7 by a, and a is 3mm. After the limit pin 7 and the locking block 6 are installed on the sliding block 2 5, the locking block 6 moves left and right by 3mm. The locking block 6 is individually limited in the left and right directions by the limit pin 7 to prevent the locking block 6 from failing after movement.
[0028] Specifically, a T-shaped sliding groove inclined forward and upward is provided at the bottom of the sliding block 4. One end of the core pulling 2 is installed in the T-shaped sliding groove and the other end is connected to the undercut 11 in the product 1. The core pulling 2 itself is inclined, consistent with the direction of the undercut 11. When the sliding block 4 moves backward horizontally, the core pulling 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 core pulling 2 to disengage from the undercut 11 obliquely upward. A guide sleeve 3 is sleeved on the outer side of the core pulling 2. The guide sleeve 3 has a guiding and lubricating function for the core pulling 2 to prevent the core pulling 2 from being damaged.
[0029] Specifically, a limiting block 9 is set in front of the sliding block 4. When self-locking, the front side of the sliding block 4 is blocked by the limiting block 9, and one end of the core pulling 2 is just connected with the undercut 11. This is the position of the sliding block 4 during injection molding of the product 1. A limiting block 10 is set behind the sliding block 5. When unlocked, the sliding block 4 and the sliding block 5 are pulled backward by the cylinder 11 through the cylinder fixing block 12, and the sliding block 5 is limited by the limiting block 10. At this time, one end of the core pulling 2 is driven by the sliding block 4 to exit the undercut 11.
[0030] The installation and movement process of the present invention is as follows: first, the guide sleeve 3 is installed into the front mold, and then the two locking blocks 6 are installed into the hollow grooves 51 on both sides of the sliding block 5, and then the two limit pins 7 are respectively inserted into the through holes 52 on both sides. At the same time, the limit pins 7 pass through the waist-shaped holes 61 on the locking block 6, so that the limit pins 7 limit and fix the locking block 6, and then the sliding block 5 and the sliding block 1 4 are fixed together with screws, and then the core pull 2 is installed into the sliding block 1 4 through the T-shaped slide groove, and then the aforementioned The parts are loaded into the front mold together and fixed with the pressure strip 8. The pressure strip 8 just contacts the convex strips on both sides of the bottom of the sliding block 4 and the sliding block 2 5. At this time, the core pulling 2 passes through the guide sleeve 3, and then the limit block 1 9 and the limit block 2 10 are fixed to the front mold. Finally, after one end of the cylinder fixing block 12 is fixed to the cylinder 11, one end of the cylinder fixing block 12 is installed into the U-shaped groove 1 53 in the sliding block 2 5, and then the cylinder fixing block 12 passes through the U-shaped groove 2 54, so that they are loaded into the front mold together. Mold action: When passing through the locking state, the cylinder 11 and the cylinder fixing block 12 move backward together, and the cylinder fixing block 12 moves backward 10mm in the U-shaped groove 153 of the sliding block 25. When the cylinder fixing block 12 contacts the rear wall of the U-shaped groove 153, it drives the sliding block 14 and the sliding block 25 to move backward together. The backward movement of the sliding block 14 drives the core pulling 2 to move obliquely upward, thereby completing the core pulling action, thereby withdrawing the undercut 11 in the product 1. In this process, at the beginning, the locking block 6 is located in the locking surface 81 in the pressure strip 8. Since the cylinder fixing block 12 moves 10mm of space, the cylinder fixing block 12 still has a tendency to move backward. As the cylinder fixing block 12 drives the sliding block 14 and the sliding block 25 to move backward, the locking block 6 is squeezed by the inclined surface of the locking surface 81 on the pressure strip 8 to move sideways by 3mm. Here, the core pulling no longer plays a locking role. During injection molding, the oil cylinder 11 and the oil cylinder fixing block 12 move forward together, and the oil cylinder fixing block 12 moves forward 10 mm in the U-shaped groove 153 of the sliding block 2 5, and the oil cylinder fixing block 12 contacts the back of the sliding block 1 4. Then, during the process of the oil cylinder fixing block 12 moving forward 10 mm, the oil cylinder fixing block 12 drives the two locking blocks 6 to move sideways by 3 mm through the inclined surfaces 121 on both sides of the front end, so that the locking blocks 6 are stuck in the locking surfaces 81 on the pressure strip 8, thereby playing a role of mechanical self-locking.
[0031] When the core pulling and clamping line of product 1 is poor and the mold space is compact, a cylinder 11 with a smaller oil diameter can be selected. By adopting the present invention, retreat during the injection molding process can be avoided, the consistency of the core pulling and clamping line state can be ensured, and the problem of occupying the mold space can be solved, thereby reducing processing costs and procurement costs.
[0032] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A lateral self-locking core-pulling structure, characterized in that: The invention comprises a core puller (2), a sliding block assembly, a locking block (6), a pressure strip (8), a cylinder (11) and a cylinder fixing block (12), wherein the locking block (6) is movably mounted on both sides of the rear part of the sliding block assembly and moves left and right therein, one end of the cylinder fixing block (12) is movably mounted in the middle of the rear part of the sliding block assembly and the other end is connected to the cylinder (11), one end of the cylinder fixing block (12) moves forward and backward in the middle of the rear part of the sliding block assembly, the pressure strip (8) is arranged on both sides of the sliding block assembly and a locking surface (81) adapted to the locking block (6) is provided on the inner side of the pressure strip (8), one end of the core puller (2) is movably mounted in the lower front side of the sliding block assembly and moves left and right therein, As the sliding block assembly moves backward horizontally, the core puller (2) moves upward obliquely. When self-locking is required, the oil cylinder (11) pushes the oil cylinder fixing block (12) forward so that it presses against one side of the sliding block assembly. During this process, the locking block (6) is driven by the front side of the oil cylinder fixing block (12) to press into the locking surface (81) on the pressure strip (8), thereby achieving self-locking. When unlocking is required, the oil cylinder (11) pulls the oil cylinder fixing block (12) backward so that it contacts the other side of the sliding block assembly. At this time, the oil cylinder (11) continues to pull backward, and the sliding block assembly is driven backward together. During this process, the locking surface (81) squeezes the locking block (6) to move inward, thereby unlocking.
2. A lateral self-locking core-pulling structure according to claim 1, characterized in that: The sliding block assembly comprises a sliding block 1 (4) and a sliding block 2 (5) fixed behind the sliding block 1 (4); the sliding block 1 (4) and the sliding block 2 (5) have the same width and are both provided with protrusions at the bottom of both sides; the pressure strip (8) contacts the top of the protrusions at the bottom of the sliding block 1 (4) and the sliding block 2 (5); a U-shaped groove 1 (53) is provided at the middle front part of the sliding block 2 (5) and a U-shaped groove 2 (54) is provided at the rear part; the length, width and depth of the U-shaped groove 1 (53) are larger than those of the U-shaped groove 2 (54); one end of the oil cylinder fixing block (12) is located in the U-shaped groove 1 (53) and the other end of the oil cylinder fixing block (12) is connected to the oil cylinder (11) after passing through the U-shaped groove 2 (54); one end of the oil cylinder fixing block (12) moves forward and backward in the U-shaped groove 1 (53); inclined surfaces (121) are provided at both sides of the front end of the oil cylinder fixing block (12).
3. A lateral self-locking core-pulling structure according to claim 2, characterized in that: The length of the U-shaped groove (53) is greater than the length of an end of the oil cylinder fixing block (12) by d, and d is 10 mm.
4. A lateral self-locking core-pulling structure according to claim 3, characterized in that: Hollow grooves (51) adapted to the locking block (6) are provided in the middle of both sides of the U-shaped groove (53) on the second sliding block (5), through holes (52) are provided on both sides of the second sliding block (5) along the sliding direction, and the through holes (52) pass through the hollow grooves (51), and a transverse waist-shaped hole (61) is provided in the middle of the locking block (6), a movable limiting pin (7) is provided in the waist-shaped hole (61), and the limiting pin (7) is also inserted into the through hole (52), and the transverse distance of the waist-shaped hole (61) is larger than the diameter of the limiting pin (7) by a, and a is 3 mm.
5. A lateral self-locking core-pulling structure according to claim 4, characterized in that: The bottom of the sliding block (4) is provided with a T-shaped sliding groove inclined forward and upward, one end of the core puller (2) is installed in the T-shaped sliding groove, and the outer side surface of the core puller (2) is sleeved with a guide sleeve (3).
6. A lateral self-locking core-pulling structure according to claim 5, characterized in that: A limiting block 1 (9) is arranged in front of the sliding block 1 (4), and a limiting block 2 (10) is arranged behind the sliding block 2 (5).