T-shaped block self-locking core-pulling structure

Abstract

The utility model belongs to the field of automobile injection molds, and particularly relates to a T-shaped block self-locking core pulling structure which comprises a pulling core, a T-shaped block, a sliding block, an oil cylinder, an oil cylinder connecting block and a pressing strip, the T-shaped block is obliquely fixed in the middle of the front portion of the bottom of the sliding block, and the top face of the pulling core is an inclined face and provided with a first locking face. The bottom face of the front portion of the sliding block is matched with the top face of the loose core, a second locking face is arranged on the bottom face of the sliding block, the T-shaped block, the top face of the loose core and the bottom face of the front portion of the sliding block are all inclined forwards and upwards, the middle of the top of the loose core is movably clamped with the T-shaped block in an inclined mode, the first locking face on the loose core is attached to the second locking face on the sliding block, and the loose core is inclined backwards and upwards. The T-shaped block horizontally retreats backwards along with the sliding block to drive the loose core to move backwards and obliquely upwards, the front end of the oil cylinder is connected with the rear end of the sliding block through the oil cylinder connecting block, and the pressing strip makes contact with the two side edges of the upper portion of the sliding block. The first locking face is matched with the second locking face, the locking force of the oil cylinder is increased, and core pulling retreating caused by large injection molding pressure is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of automotive injection molds, specifically relating to a T-block self-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 T-block self-locking core-pulling structure, which uses locking surface one and locking surface two in combination to increase the locking force of the hydraulic cylinder and prevent the backing out due to high pressure during the injection molding process.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a T-shaped block self-locking core-pulling structure, comprising a core-pulling component, a T-shaped block, a sliding block, a hydraulic cylinder, a hydraulic cylinder connecting block, and a pressure strip. The T-shaped block is obliquely fixed to the middle of the front part of the bottom of the sliding block. The top surface of the core-pulling component is oblique and has a locking surface one. The bottom front part of the sliding block is adapted to the top surface of the core-pulling component, and a locking surface two is provided on the bottom surface of the sliding block. The T-shaped block, the top surface of the core-pulling component, and the bottom front part of the sliding block are all inclined forward and upward. The middle of the top of the core-pulling component is obliquely and movably engaged with the T-shaped block, and the locking surface one on the core-pulling component and the locking surface two on the sliding block are in contact. The core-pulling component is inclined backward and upward. The T-shaped block moves backward horizontally with the sliding block, causing the core-pulling component to move obliquely upward and backward. The front end of the hydraulic cylinder is connected to the rear end of the sliding block through the hydraulic cylinder connecting block. The pressure strip contacts the two sides of the upper part of the sliding block, and the sliding block moves horizontally back and forth along the pressure strips on both sides.

[0005] Furthermore, the lower side of the T-block is T-shaped, and a T-groove that matches the lower part of the T-block is provided in the middle of the top of the core-pulling part. The distance between the lower part of the T-groove is greater than the height of the bottom of the T-block by d, where d is 5mm.

[0006] Furthermore, a slot is provided at the rear end of the sliding block, and U-shaped grooves are provided on both sides of the front end of the hydraulic cylinder connecting block. The front end of the hydraulic cylinder connecting block and the rear end of the sliding block are engaged with each other, and the rear end of the hydraulic cylinder connecting block is fixed to the front end of the hydraulic cylinder. A limit pin is fixed on the front end surface of the sliding block, and a limit block is provided at the rear.

[0007] Compared with the prior art, the utility model discloses the beneficial effects are: the utility model discloses the cooperation of locking surface one and locking surface two, and locking surface one and locking surface two are all slightly inclined to the upside of front side, and the locking force of oil cylinder is increased downwards compared with the former big slope, avoids the situation of retreat due to the pressure during the injection moulding process, thereby greatly reduce the oil cylinder model and avoid the product section difference influence product quality that core pulling retreats produce, and the cost of mould and procurement cost are reduced simultaneously, the utility model discloses the cooperation of T -shaped block and T -shaped groove on core pulling, and through T -shaped block first movement 5mm's locking clearance, make locking surface one and locking surface two separate, thereby can realize normal core pulling. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is prior art structure schematic diagram;

[0009] Figure 2 It is the utility model and product explosion map;

[0010] Figure 3 It is the plan view when the utility model is installed to the locking state of product;

[0011] Figure 4 It is Figure 3 the section view at A-A;

[0012] Figure 5 It is Figure 4 the section view at B-B;

[0013] Figure 6 It is the front view when the utility model is installed to the locking state of product;

[0014] Figure 7 It is Figure 6 the enlarged view at C;

[0015] Figure 8 It is the plan view when the utility model is separated from the core pulling state of product reverse buckle;

[0016] Figure 9 It is Figure 8 the section view at D-D;

[0017] Figure 10 It is Figure 9 the section view at E-E;

[0018] Figure 11 It is the front view when the utility model is separated from the core pulling state of product reverse buckle;

[0019] Figure 12 It is Figure 11 the enlarged view at F. DETAILED DESCRIPTION

[0020] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0021] Please refer to Figure 1 , the reversing core-pulling structure in the prior art is that the oil cylinder 7 connects 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, then the bottom surface of the sliding block 4 is connected with the core-pulling 2, the bottom surface of the sliding block 4 is provided with a guide rail, the guide rail is designed with an angle T-shaped slide groove, the top end of the core-pulling 2 is movably connected in the T-shaped slide groove, the core-pulling 2 is inclined and the bottom end is connected in the undercut 11 of the product 1, when the sliding block 4 slides horizontally backward, the core-pulling 2 relatively slides 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 be inclined and out of the undercut 11. When the undercut 11 of the product 1 is large, the projected area is large, and this form is continued to be used, 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 product 1 will be scrapped due to the large injection force during injection molding, causing the oil cylinder 7 to retreat and causing the product 1 to have steps and differences; if a 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 structure with low price and only ordinary oil cylinder 7 to reduce the cost.

[0022] Please refer to Figures 2-12The utility model provides the following technical scheme: A kind of T-block self-locking core-pulling structure, including core-pulling 2, T-block 3, sliding block 4, oil cylinder 7, oil cylinder connecting block 8 and press strip 9, wherein press strip 9 is provided with two, T-block 3 is fixed in the middle of the bottom front of sliding block 4 obliquely, sliding block 4 can drive T-block 3 movement together, the top surface of core-pulling 2 is inclined plane and is provided with locking surface one 21 on it, the top surface of core-pulling 2 is adapted and is provided with locking surface two 41 on the bottom surface of sliding block 4 front, the bottom surface of sliding block 4 front is also inclined plane, the top surface of T-block 3, core-pulling 2 and the bottom surface of sliding block 4 front are all inclined to forward upper side, locking surface one 21 is located in the middle of the top surface of core-pulling 2, locking surface two 41 is also located in the middle of the bottom surface of sliding block 4 front, and locking surface one 21 and locking surface two 41 are all slightly inclined to forward upper side, and the angle of inclination is 1 °, the angle of the front side and rear side inclined plane of the top surface of core-pulling 2 and the bottom surface of sliding block 4 front is larger and consistent, and the angle of inclination is designed according to the reverse buckle 11 on product 1, when being in locking state, the top middle of core-pulling 2 is obliquely movably connected with T-block 3 and locking surface one 21 on core-pulling 2 and locking surface two 41 on sliding block 4 are attached, the top surface of core-pulling 2 and the bottom surface of sliding block 4 front are also attached, oil cylinder 7 front end is connected with the rear end of sliding block 4 through oil cylinder connecting block 8, press strip 9 is contacted with the two side edges of the upper portion of sliding block 4 and sliding block 4 moves horizontally forward and backward along the press strip 9 of two sides, when injection molding in locking state, oil cylinder 7 is resisted by sliding block 4, and the abutting force of oil cylinder 7 is transmitted to sliding block 4, and the bottom surface of sliding block 4 front is resisted by the top surface of core-pulling 2, since locking surface one 21 and locking surface two 41 are respectively provided on core-pulling 2 and sliding block 4 and are inclined to forward upper side by 1 °, the downward pressure of locking surface one 21 and locking surface two 41 is greatly increased when being abutted by oil cylinder 7, so as to prevent oil cylinder 7 from retreating, locking surface one 21 and locking surface two 41 are attached to realize self-locking of oil cylinder 7, and core-pulling 2 is inclined to rear upper side, when sliding block 4 is driven by oil cylinder 7 to retreat backward, T-block 3 retreats horizontally backward along with sliding block 4 and drives core-pulling 2 to move obliquely upward to rear, in this process, sliding block 4 drives T-block 3 to move a distance first, at this time, core-pulling 2 is stationary, so that locking surface one 21 and locking surface two 41 are separated, and then T-block 3 drives core-pulling 2 to move obliquely upward to rear.

[0023] Specifically, the lower side of the T-shaped block 3 is T-shaped, a T-shaped groove 22 is arranged in the middle of the top of the core-pulling part 2 and matches the lower part of the T-shaped block 3, the lower part of the T-shaped block 3 is clamped in the T-shaped groove 22 in the middle of the top of the core-pulling part 2, the T-shaped groove 22 is also inclined upward and forward, the lower part of the T-shaped groove 22 has a distance greater than the height of the bottom of the T-shaped block 3 by d, d is 5 mm, in the locked state, the bottom of the T-shaped block 3 is in contact with the bottom surface of the T-shaped groove 22, since the T-shaped block 3 and the T-shaped groove 22 are both inclined upward and forward, and the core-pulling part 2 is inclined upward and backward, after the T-shaped block 3 retreats horizontally by a distance, the T-shaped block 3 moves upward by 5 mm in the direction perpendicular to the axis direction of the T-shaped groove, the upper surfaces on both sides of the bottom of the T-shaped block 3 are in contact with the upper surfaces of the lower part of the T-shaped groove 22, at this time, the core-pulling part 2 does not move and the locking surface one 21 and the locking surface two 41 are separated, and the core-pulling part 2 is no longer locked, the T-shaped block 3 continues to retreat horizontally, 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 part 2 to move obliquely upward and backward, so that the bottom end of the core-pulling part 2 is separated from the reverse buckle 11 on the product 1.

[0024] Specifically, a clamping groove 42 is arranged at the rear end of the sliding block 4, U-shaped grooves 81 are arranged at the front end of the oil cylinder connecting block 8 on both sides, the front end of the oil cylinder connecting block 8 is clamped with the rear end of the sliding block 4, and the rear end of the oil cylinder connecting block 8 is fixed with the front end of the oil cylinder 7, so that the oil cylinder 7 can drive the sliding block 4 to move through the oil cylinder connecting block 8, the rear end of the sliding block 4 is provided with a limiting block 6, and the front end surface of the sliding block 4 is fixed with a limiting pin 5, the limiting pin 5 is arranged to limit the forward movement of the sliding block 4 by a distance, and at this time, the core-pulling part 2 is just in the locked state, and the limiting block 6 is arranged to limit the backward movement of the sliding block 4 by a distance, and at this time, the bottom end of the core-pulling part 2 is just separated from the reverse buckle 11 on the product 1.

[0025] The installation process of the utility model is as follows: first, the T-shaped block 3 is fixed to the middle of the bottom of the front part of the sliding block 4, and the limiting pin 5 is fixed to the front end surface of the sliding block 4, then the T-shaped groove 22 in the top of the core-pulling part 2 is clamped to the lower part of the T-shaped block 3, and then they are put into the front mold together, at this time, the top surface of the core-pulling part 2 is attached to the bottom surface of the front part of the sliding block 4, then the limiting block 6 is fixed to the front mold, the limiting block 6 is located at the rear of the sliding block 4, then the two pressing strips 9 are placed on the top of the sliding block 4 on both sides, then the pressing strips 9 are fixed to the front mold, so that the sliding block 4 is fixed, finally, the oil cylinder 7 and the oil cylinder connecting block 8 are fixed, then the oil cylinder connecting block 8 and the sliding block 4 are clamped and fixed through the U-shaped grooves 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 in the front mold together, so that the assembly is completed.

[0026] The utility model discloses a mold action as: when from locking state to core-pulling state, oil cylinder 7 drives sliding block 4 to retreat through oil cylinder connecting block 8, then sliding block 4 drives T block 3 to retreat simultaneously, since T block 3 and T type groove 22 are all inclined to the front and top and core-pulling 2 is inclined to the back and top, and the spacing of T type groove 22 lower part is 5mm greater than the height of T block 3 bottom, so T block 3 is driven to move 5mm locking gap first, at this time, core-pulling 2 does not move, and the bottom end of core-pulling 2 is still in reverse buckle 11, but this makes locking surface two 41 on sliding block 4 separate from locking surface one 21 on core-pulling 2, and no longer lock, then core-pulling 2 is driven to move to the back and top obliquely in T block 3 bottom two sides inclined surface in T type groove 22, and the core-pulling action is completed, when from core-pulling state to locking state, oil cylinder 7 drives sliding block 4 to move forward through oil cylinder connecting block 8, and sliding block 4 drives T block 3 to move forward, when the upper surface of T block 3 bottom two sides contacts the upper surface of T type groove 22 on core-pulling 2, since the height of T block 3 bottom and the spacing of T type groove 22 lower part on core-pulling 2 have 5mm gap, so sliding block 4 can continue to push T block 3 to move forward, when T block 3 bottom contacts T type groove 22 bottom, no longer moves, at this time, the front bottom surface of sliding block 4 and the top surface of core-pulling 2 just fit, locking surface two 41 and locking surface one 21 fit, can lock core-pulling 2, prevent retreat, thereby play the function of mechanical self-locking.

[0027] When the core-pulling clamping line of product 1 is poor and the mold space is compact, the oil cylinder 7 with smaller oil diameter can be selected, and the utility model can avoid retreat in the injection molding process, ensure the consistency of the core-pulling clamping line state, also can solve the problem of occupying the mold space, reduce the processing cost and the procurement cost.

[0028] Finally, it should be noted that: the above is only the preferred embodiment of the utility model, and is not used for limiting the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or make equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A T-shaped block self-locking core-pulling structure, characterized in that, The assembly includes a core puller (2), a T-shaped block (3), a sliding block (4), a hydraulic cylinder (7), a hydraulic cylinder connecting block (8), and a pressure strip (9). The T-shaped block (3) is obliquely fixed to the middle of the front bottom of the sliding block (4). The top surface of the core puller (2) is inclined and has a locking surface one (21) on it. The bottom front surface of the sliding block (4) is adapted to the top surface of the core puller (2), and a locking surface two (41) is provided on the bottom surface of the sliding block (4). The top surface of the T-shaped block (3), the core puller (2), and the bottom front surface of the sliding block (4) are all inclined forward and upward. 2) The top center is obliquely engaged with the T-shaped block (3), and the locking surface 1 (21) on the core puller (2) and the locking surface 2 (41) on the sliding block (4) are in contact. The core puller (2) is tilted backward and upward. The T-shaped block (3) moves backward horizontally with the sliding block (4), causing the core puller (2) to move backward and upward obliquely. 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 sides of the upper part of the sliding block (4), and the sliding block (4) moves horizontally back and forth along the pressure strips (9) on both sides.

2. The T-shaped block self-locking core-pulling structure according to claim 1, characterized in that, The lower side of the T-shaped block (3) is T-shaped, and the top center of the core puller (2) is provided with a T-shaped groove (22) that matches the lower part of the T-shaped block (3). The lower spacing of the T-shaped groove (22) is greater than the bottom height of the T-shaped block (3) by d, where d is 5mm.

3. The T-shaped block self-locking core-pulling structure according to claim 2, characterized in that, The sliding block (4) has a slot (42) at its rear end, and the cylinder connecting block (8) has U-shaped grooves (81) on both sides of its front end. The front end of the cylinder connecting block (8) and the rear end of the sliding block (4) are engaged with each other. The rear end of the cylinder connecting block (8) and the front end of the cylinder (7) are fixed. The sliding block (4) has a limit pin (5) fixed on its front end surface and a limit block (6) at its rear.

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