T-shaped block self-locking core-pulling structure
By adopting a T-block self-locking core pulling structure in the core pulling structure, and using the combination of the locking surface and the T-block, the problem of oil cylinder retreat during the injection molding process is solved, reducing the cylinder model and improving product quality are achieved, and cost is reduced.
Patent Information
- Application Number
- CN202510385609.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-29
- Publication Date
- 2025-06-24
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.
The T-block self-locking core pulling structure is adopted. By cooperating with locking surface one and locking surface two, the locking force of the oil cylinder is increased to prevent the oil cylinder from retreating, and the T-block is cooperated with the T-slot on the core pulling structure to achieve normal extraction of the core pulling.
It effectively avoids the situation of the oil cylinder retreating during the injection molding process, reduces the cylinder model, avoids product segment differences, and reduces mold and procurement costs.
Smart Images
Figure CN120190975A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of automotive injection molds, and particularly relates to a self-locking core-pulling structure of a T-shaped block. Background Art
[0002] The usual core-pulling structure for commutation is a core-pulling structure driven by an oil cylinder. As shown in Figure 1 the figure, the form of oil cylinder commutation is that the oil cylinder drives a sliding block through a connection. An angled T-shaped sliding groove is provided on the guide rail on the bottom surface of the sliding block, and the core-pulling is connected to the T-shaped sliding groove, thereby completing the core-pulling. When the undercut amount of the product is large and the projected area is large, adopting this form, the design of the commutation form needs to calculate the size of the selected oil cylinder according to the undercut amount of the product and the projected area of the product. When the projected area of the product is too large, it will lead to too large injection pressure. Then, the ordinary commutation oil cylinder cannot be locked, and the oil cylinder will retreat during injection molding, resulting in steps and offsets on the product, and the product will be scrapped; if a self-locking oil cylinder from abroad is used, the price is expensive, which is also a significant expense. Summary of the Invention
[0003] To solve the above problems existing in the prior art, the present invention provides a self-locking core-pulling structure of a T-shaped block, which uses the cooperation of locking surface one and locking surface two to increase the locking force of the oil cylinder and avoid the situation of retreating due to large pressure during the injection molding process.
[0004] To achieve the above object, the present invention provides the following technical solution: A self-locking core-pulling structure of a T-shaped block, including a core-pulling, a T-shaped block, a sliding block, an oil cylinder, an oil cylinder connection block, and a pressing strip. The T-shaped block is obliquely fixed in the middle of the front part of the bottom of the sliding block. The top surface of the core-pulling is an inclined surface and is provided with locking surface one. The front bottom surface of the sliding block is adapted to the top surface of the core-pulling and the bottom surface of the sliding block is provided with locking surface two. The T-shaped block, the top surface of the core-pulling, and the front bottom surface of the sliding block are all inclined forward and upward. The middle of the top of the core-pulling is obliquely and movably clamped with the T-shaped block, and the locking surface one on the core-pulling and the locking surface two on the sliding block are in contact with each other. The core-pulling is inclined backward and upward. The T-shaped block drives the core-pulling to move obliquely upward backward as the sliding block moves horizontally backward. The front end of the oil cylinder is connected to the rear end of the sliding block through the oil cylinder connection block. The pressing strip contacts the two side edges of the upper part of the sliding block, and the sliding block moves horizontally back and forth along the two pressing strips.
[0005] Further, the lower side surface of the T-shaped block is T-shaped, and a T-shaped groove adapted to the lower part of the T-shaped block is provided in the middle of the top of the core-pulling. The distance between the lower parts of the T-shaped groove is larger than the height of the bottom of the T-shaped block by d, and d is 5 mm.
[0006] Further, a clamping groove is provided at the rear end of the sliding block, U-shaped grooves are provided on both sides of the front end of the oil cylinder connection block, the front end of the oil cylinder connection block and the rear end of the sliding block are clamped with each other, the rear end of the oil cylinder connection block is fixed to the front end of the oil cylinder, a limiting pin is fixed on the front end surface of the sliding block, and a limiting block is provided at the rear.
[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention adopts the cooperation of locking surface 1 and locking surface 2. Both locking surface 1 and locking surface 2 are slightly inclined upward at the front side. The oil cylinder squeezes locking surface 1 and locking surface 2, which increases the downward locking force of the oil cylinder compared with the original large inclined surface, avoiding the situation of retraction due to large pressure during the injection molding process. Thus, the model of the oil cylinder is greatly reduced and the product segment difference caused by the core-pulling retraction is avoided, which affects the product quality. At the same time, the cost of the mold and the procurement cost are reduced. The present invention adopts the cooperation of the T-shaped block and the T-shaped groove on the core-pulling. By moving the locking clearance of 5 mm first with the T-shaped block, locking surface 1 and locking surface 2 are disengaged, so that normal core-pulling can be realized. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 is a schematic structural diagram of the prior art;
[0009] Figure 2 is an exploded view of the present invention and the product;
[0010] Figure 3 is a top view of the present invention when installed on the product in the locked state;
[0011] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in
[0012] Figure 5 is Figure 4 a cross-sectional view taken along line B-B in
[0013] Figure 6 is a front view of the present invention when installed on the product in the locked state;
[0014] Figure 7 is Figure 6 an enlarged view at C in
[0015] Figure 8 is a top view of the present invention when disengaged from the product undercut core-pulling state;
[0016] Figure 9 is Figure 8 a cross-sectional view taken along line D-D in
[0017] Figure 10 is Figure 9 a cross-sectional view taken along line E-E in
[0018] Figure 11 is a front view of the present invention when disengaged from the product undercut core-pulling state;
[0019] Figure 12 is Figure 11 an enlarged view at F in DETAILED DESCRIPTION OF THE INVENTION
[0020] 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.
[0021] See also Figure 1 The reversing core-pulling structure in the prior art is that the oil cylinder 7 is connected to the rear end of the sliding block 4 through the oil cylinder connecting block 8 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. A guide rail is provided on the bottom surface of the sliding block 4, 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 the bottom 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 relative height of the connection between the T-shaped slide groove and the core-pulling gradually increases when the T-shaped slide groove retreats, thereby driving the core-pulling 2 to disengage 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 7 needs to be selected, but this will increase the cost; if the ordinary oil cylinder 7 is still selected, the oil cylinder 7 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 7 is used, the price is expensive, which is also a considerable expense. Therefore, it is urgent to develop a low-priced structure that only requires the cooperation of the ordinary oil cylinder 7 to reduce costs.
[0022] See also Figure 2 - 12, the present invention provides the following technical solution: a T-shaped block self-locking core-pulling structure, including a core-pulling member 2, a T-shaped block 3, a sliding block 4, an oil cylinder 7, an oil cylinder connecting block 8 and a pressing strip 9. Among them, there are two pressing strips 9. The T-shaped block 3 is obliquely fixed in the middle of the front part of the bottom of the sliding block 4. The sliding block 4 can drive the T-shaped block 3 to move together. The top surface of the core-pulling member 2 is an inclined surface and is provided with a first locking surface 21 thereon. The front bottom surface of the sliding block 4 is adapted to the top surface of the core-pulling member 2 and a second locking surface 41 is provided on the bottom surface of the sliding block 4. The front bottom surface of the sliding block 4 is also an inclined surface. The T-shaped block 3, the top surface of the core-pulling member 2 and the front bottom surface of the sliding block 4 are all inclined forward and upward. The first locking surface 21 is located in the middle of the top surface of the core-pulling member 2, and the second locking surface 41 is also located in the middle of the front bottom surface of the sliding block 4. And both the first locking surface 21 and the second locking surface 41 are slightly inclined forward and upward, and the inclination angle is 1°. The angles of the front and rear inclined surfaces of the top surface of the core-pulling member 2 and the front bottom surface of the sliding block 4 are larger and the same, and the inclination angle is designed according to the undercut 11 on the product 1. When in the locked state, the middle of the top of the core-pulling member 2 is obliquely and movably clamped with the T-shaped block 3, and the first locking surface 21 on the core-pulling member 2 and the second locking surface 41 on the sliding block 4 are in contact with each other. The top surface of the core-pulling member 2 and the front bottom surface of the sliding block 4 are also in contact with each other. The front end of the oil cylinder 7 is connected to the rear end of the sliding block 4 through the oil cylinder connecting block 8. The pressing strips 9 are in contact with the two side edges of the upper part of the sliding block 4, and the sliding block 4 moves horizontally back and forth along the two pressing strips 9. During injection molding in the locked state, the oil cylinder 7 presses against the sliding block 4, and the pressing force of the oil cylinder 7 is transmitted to the sliding block 4. The front bottom surface of the sliding block 4 presses against the top surface of the core-pulling member 2. Since the first locking surface 21 and the second locking surface 41 are respectively provided on the core-pulling member 2 and the sliding block 4 and are inclined forward and upward by 1°, the downward pressure when the first locking surface 21 and the second locking surface 41 are pressed by the oil cylinder 7 is greatly increased compared with the original inclined surface, thereby preventing the oil cylinder 7 from retreating. When the first locking surface 21 and the second locking surface 41 are in contact with each other, the self-locking of the oil cylinder 7 is achieved. The core-pulling member 2 is inclined backward and upward. When the sliding block 4 is driven by the oil cylinder 7 to move backward, the T-shaped block 3 moves horizontally backward with the sliding block 4 and drives the core-pulling member 2 to move obliquely upward backward. During this process, the sliding block 4 first drives the T-shaped block 3 to move a certain distance. At this time, the core-pulling member 2 does not move, so that the first locking surface 21 and the second locking surface 41 are separated, and then the T-shaped block 3 drives the core-pulling member 2 to move obliquely upward backward.
[0023] Specifically, the lower side of the T-shaped block 3 is T-shaped. A T-shaped groove 22 adapted to the lower part of the T-shaped block 3 is provided in the middle of the top of the core-pulling block 2. The lower part of the T-shaped block 3 is stuck in the T-shaped groove 22 in the middle of the top of the core-pulling block 2. The T-shaped groove 22 is also inclined forward and upward. The distance between the lower parts of the T-shaped groove 22 is larger than the height of the bottom of the T-shaped block 3 by d, where d is 5 mm. In the locked state, the bottom of the T-shaped block 3 contacts the bottom surface of the T-shaped groove 22. Since both the T-shaped block 3 and the T-shaped groove 22 are inclined forward and upward, and the core-pulling block 2 is inclined backward and upward, after the T-shaped block 3 horizontally retreats a certain distance, the T-shaped block 3 moves upward by 5 mm in the direction perpendicular to the axial direction of the T-shaped groove. The upper surfaces on both sides of the bottom of the T-shaped block 3 contact the upper surfaces of the lower part of the T-shaped groove 22. At this time, the core-pulling block 2 does not move and the locking surface one 21 and the locking surface two 41 are disengaged and no longer locked. The T-shaped block 3 continues to horizontally retreat. Under the action of the upper surfaces on both sides of the bottom of the T-shaped block 3, the T-shaped block 3 drives the core-pulling block 2 to move obliquely upward backward, so that the bottom end of the core-pulling block 2 disengages from the undercut 11 on the product 1.
[0024] Specifically, a clamping groove 42 is provided at the rear end of the sliding block 4. U-shaped grooves 81 are provided on both sides of the front end of the oil cylinder connecting block 8. The front end of the oil cylinder connecting block 8 is clamped with the rear end of the sliding block 4. The rear end of the oil cylinder connecting block 8 is fixed to the front end of the oil cylinder 7. Thus, the oil cylinder 7 can drive the sliding block 4 to move through the oil cylinder connecting block 8. A limit pin 5 is fixed on the front end surface of the sliding block 4, and a limit block 6 is arranged at the rear. The limit pin 5 is provided to limit the sliding block 4 to move forward a certain distance. At this time, it is exactly in the locked state. The limit block 6 is provided to limit the sliding block 4 to move backward a certain distance. At this time, the bottom end of the core-pulling block 2 just disengages from the undercut 11 on the product 1.
[0025] The installation process of the present invention is as follows: First, the T-shaped block 3 is fixed to the bottom of the front part of the sliding block 4, and the limit pin 5 is fixed to the front end surface of the sliding block 4. Then, it is stuck to the lower part of the T-shaped block 3 through the T-shaped groove 22 at the top of the core-pulling block 2, and then they are installed together into the front mold. At this time, the top surface of the core-pulling block 2 is attached to the bottom surface of the front part of the sliding block 4. Then, the limit block 6 is fixed to the front mold. The limit block 6 is located behind the sliding block 4. Then, two pressing strips 9 are placed on both sides of the top of the sliding block 4, and then the pressing strips 9 are fixed to the front mold, thereby fixing the sliding block 4. Finally, the oil cylinder 7 and the oil cylinder connecting block 8 are fixed. Then, the oil cylinder connecting block 8 is clamped and fixed to the sliding block 4 through the U-shaped groove 81 on the oil cylinder connecting block 8 and the clamping groove 42 at the rear end of the sliding block 4, and they are fixed to the front mold together. In this way, the assembly is completed.
[0026] The mold movement of the present invention is as follows: When changing from the locked state to the core-pulling state, the oil cylinder 7 drives the sliding block 4 to move backward through the oil cylinder connection block 8, and then the sliding block 4 drives the T-shaped block 3 to move backward at the same time. Since both the T-shaped block 3 and the T-shaped groove 22 are inclined forward and upward, and the core-pulling 2 is inclined backward and upward, and the distance between the lower parts of the T-shaped groove 22 is 5 mm larger than the bottom height of the T-shaped block 3, the T-shaped block 3 is first driven to move by 5 mm of locking clearance. At this time, the core-pulling 2 does not move, and the bottom end of the core-pulling 2 is still in the undercut 11. However, this causes the locking surface two 41 on the sliding block 4 to separate from the locking surface one 21 on the core-pulling 2 and no longer locks. Subsequently, the core-pulling 2 moves obliquely backward and upward under the drive of the inclined surfaces on both sides of the bottom of the T-shaped block 3 in the T-shaped groove 22 to complete the core-pulling action; when changing from the core-pulling state to the locked state, the oil cylinder 7 drives the sliding block 4 to move forward through the oil cylinder connection block 8, and the sliding block 4 drives the T-shaped block 3 to move forward. When the upper surfaces on both sides of the bottom of the T-shaped block 3 contact the upper surface of the lower part of the T-shaped groove 22 on the core-pulling 2, due to the 5 mm clearance between the bottom height of the T-shaped block 3 and the distance between the lower parts of the T-shaped groove 22 on the core-pulling 2, the sliding block 4 can continue to push the T-shaped block 3 forward. When the bottom of the T-shaped block 3 contacts the bottom of the T-shaped groove 22, it stops moving. At this time, the front bottom surface of the sliding block 4 just fits with the top surface of the core-pulling 2, and the locking surface two 41 and the locking surface one 21 fit together, which can lock the core-pulling 2 to prevent it from moving backward, thus playing a role of mechanical self-locking.
[0027] When the core-pulling wire clamping of the product 1 is poor and the mold space is compact, an oil cylinder 7 with a smaller oil diameter can be selected. By adopting the present invention, it is possible to avoid backward movement during the injection molding process, ensure the consistency of the core-pulling wire clamping state, and also solve the problem of occupying the mold space, reducing the processing cost and the procurement cost.
[0028] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A T-block self-locking core-pulling structure, characterized in that: The invention comprises a core puller (2), a T-block (3), a sliding block (4), an oil cylinder (7), an oil cylinder connecting block (8) and a pressure strip (9), wherein the T-block (3) is fixed obliquely in the middle of the front bottom of the sliding block (4), the top surface of the core puller (2) is an inclined surface and a locking surface 1 (21) is arranged on it, the front bottom surface of the sliding block (4) is matched with the top surface of the core puller (2) and a locking surface 2 (41) is arranged on the bottom surface of the sliding block (4), the T-block (3), the top surface of the core puller (2) and the front bottom surface of the sliding block (4) are all inclined forward and upward, and the core puller (2) is inclined upward and downward. 2) The middle of the top is obliquely engaged with the T-block (3) and the locking surface 1 (21) on the core puller (2) is in contact with the locking surface 2 (41) on the sliding block (4), the core puller (2) is inclined backward and upward, the T-block (3) moves backward horizontally with the sliding block (4) to drive the core puller (2) to move obliquely upward backward, the front end of the oil cylinder (7) is connected to the rear end of the sliding block (4) through the oil cylinder connecting block (8), the pressure strip (9) contacts the two side edges of the upper part of the sliding block (4), and the sliding block (4) moves horizontally forward and backward along the pressure strips (9) on both sides.
2. A T-block self-locking core-pulling structure according to claim 1, characterized in that: The lower side of the T-block (3) is T-shaped, and a T-slot (22) adapted to the lower part of the T-block (3) is arranged in the middle of the top of the core pulling (2), and the lower spacing of the T-slot (22) is greater than the bottom height of the T-block (3) by d, and d is 5 mm.
3. A T-block self-locking core-pulling structure according to claim 2, characterized in that: The rear end of the sliding block (4) is provided with a slot (42), and both sides of the front end of the oil cylinder connecting block (8) are provided with U-shaped slots (81). The front end of the oil cylinder connecting block (8) and the rear end of the sliding block (4) are mutually engaged, and the rear end of the oil cylinder connecting block (8) is fixed to the front end of the oil cylinder (7). A limiting pin (5) is fixed on the front end surface of the sliding block (4), and a limiting block (6) is arranged at the rear.