Core-pulling locking mechanism for injection molds

Abstract

The utility model provides a core-pulling locking mechanism for an injection mold, comprising an oil cylinder, a transmission block, a locking block, a slide seat, and an inclined top. The slide seat is provided with a transmission slide groove, and locking grooves connected to the transmission slide groove are provided on the groove walls on both sides of the transmission slide groove. Two positioning grooves connected to the locking groove are provided on the mold. The transmission block is slidably arranged in the transmission slide groove, and two relatively inclined guide slide grooves are formed on the transmission block. The locking block is provided with two locking blocks, and the locking block is slidably arranged in the locking groove. One end of the locking block is located in the transmission slide groove and is provided with an inclined guide surface, and the guide surface is in close contact with the groove wall of the guide slide groove. When the mold is closed, the other end of the locking block extends out of the locking groove and is located in the positioning groove. In the core-pulling locking mechanism of the injection mold, when the mold is closed, the locking block locks the inclined top during injection molding to prevent the inclined top from retreating due to the injection pressure during core pulling, and prevents the injection molded product from being out of shape, thereby ensuring the beauty and uniformity of product molding and improving the qualified rate of injection molded products.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds and relates to a core-pulling locking mechanism of an injection mold. Background Art

[0002] In the prior art, the core-pulling and demoulding of the undercut structure of the product in the injection mold is carried out by setting a wedge-shaped slider inside the mold and slidingly connecting it through a T-shaped groove rail to drive the inclined core-pulling block to move obliquely to pull the core out of the undercut structure of the product. For example, the Chinese patent number is "201420874188.8", and the name is "A kind of inclined top core-pulling device for injection molds". The specific structure of the inclined top core-pulling device is as follows: it includes an inclined top block A and an inclined top block B, wherein: the inclined top block A is a block-shaped steel component, the top of the inclined top block A is a horizontal plane, the left side of the inclined top block A is provided with a profile corresponding to the undercut surface of the product, which is called the undercut profile, the upper right side of the inclined top block A is provided with an inclined surface inclined from top to bottom and right, which is called the A splicing surface, and the bottom of the inclined top block A is provided with a steel connecting rod with a rectangular cross section, which is called the A inclined top rod, and the lower end of the A inclined top rod is connected by a T-shaped slide rail. The sliding connection with a steel block is called the A sliding foot; the B inclined lift block is a block-shaped steel component, and the upper surface of the B inclined lift block is provided with a profile corresponding to the interference surface of the product, which is called the interference profile; the upper left side surface of the B inclined lift block is provided with an inclined surface corresponding to the A splicing surface of the A inclined lift block, which is called the B splicing surface; the lower side of the B inclined lift block is provided with a steel connecting rod with a rectangular cross-section, which is called the B inclined lift rod; the lower end of the B inclined lift rod is slidably connected with a steel block-shaped sliding groove, which is called the B sliding foot, through a T-shaped slide rail; when working, the top plate moves upward, and the top plate pushes the A inclined lift block and the B inclined lift block to be demoulded synchronously through the A sliding foot, the A inclined lift rod and the B sliding foot and the B inclined lift rod.

[0003] In the above structure, due to defects in the core pulling action and factors such as high injection pressure, the inclined ejector block may retreat, which may cause the injection molded products to be out of batch shape and have differences in product shape, resulting in an increase in the rejection rate of the injection molded products. Summary of the invention

[0004] The utility model aims to solve the above problems existing in the prior art and provides a core-pulling locking mechanism for an injection mold which can lock the inclined top during injection molding.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a core-pulling locking mechanism of an injection mold comprises an oil cylinder, a transmission block, a locking block, a slide seat, and an inclined top, the piston rod of the oil cylinder is connected to the transmission block, the inclined top is slidably arranged on the slide seat, a transmission slide groove is formed on the slide seat, and locking grooves connected to the transmission slide groove are formed on the groove walls on both sides of the transmission slide groove, and two positioning grooves connected to the locking groove are formed on the mold, the transmission block is slidably arranged in the transmission slide groove, and two relatively inclined guide slide grooves are formed on the transmission block, the locking block is provided with two, and the locking block is slidably arranged in the locking groove, one end of the locking block is located in the transmission slide groove and is provided with an inclined guide surface, the guide surface is in close contact with the groove wall of the guide slide groove, and the other end of the locking block extends out of the locking groove and is located in the positioning groove when the mold is closed.

[0006] In the core-pulling locking mechanism of the above-mentioned injection mold, the end of the two guide grooves that are close to each other is the core-pulling end, and the end of the two guide grooves that are away from each other is the locking end. When the mold is closed, the locking block is located in the locking end of the guide groove; after the mold is opened, the oil cylinder drives the transmission block to move in the transmission groove, and the two locking blocks move from the locking end to the core-pulling end along the inclined guide groove wall, and the two locking blocks move toward each other, and the ends of the locking blocks gradually disengage from the positioning groove.

[0007] In the core-pulling locking mechanism of the injection mold described above, a guide protrusion is formed on the transmission block, a transmission step is formed between the guide protrusion and the transmission block, and the guide slot is located on the guide protrusion.

[0008] In the core-pulling locking mechanism of the above-mentioned injection mold, the oil cylinder drives the transmission block to move. When the transmission block moves to the point where the transmission step contacts the bottom of the transmission slide groove, the oil cylinder drives the slide to move synchronously through the transmission block.

[0009] In the core-pulling locking mechanism of the above-mentioned injection mold, it also includes a mounting block fixed on the mold, a sliding groove is formed in the mounting block, a mounting hole is formed at the bottom of the sliding groove, the slide seat is slidably arranged in the sliding groove, the piston rod of the oil cylinder passes through the mounting hole and is connected to the transmission block, the oil cylinder drives the slide seat to move through the transmission block, and when the slide seat moves to the point where it contacts the bottom of the sliding groove, the slide seat stops moving.

[0010] In the core-pulling locking mechanism of the above-mentioned injection mold, a spring is sleeved on the piston rod of the cylinder, and the spring is located in the sliding groove. The diameter of the spring is larger than the width of the mounting hole and the width of the end face of the transmission block. The two ends of the spring are respectively in contact with the bottom of the sliding groove and the slide seat. When the cylinder drives the transmission block to move, the spring is still in an extended state; when the cylinder drives the slide seat to move, the spring is compressed.

[0011] In the core-pulling locking mechanism of the above-mentioned injection mold, an inclined I-shaped groove is formed at the end of the slide seat, and an I-shaped block is provided at the corresponding end of the inclined top. The inclined top is slidably arranged on the slide seat through the cooperation of the I-shaped block and the I-shaped groove.

[0012] In the core-pulling locking mechanism of the above-mentioned injection mold, an inclined guide slider is formed on the side of the guide slot, the inclination angle of the guide slider is the same as the inclination angle of the guide slot, and a guide groove for the guide slider to enter is formed on the locking block.

[0013] Compared with the prior art, in the core pulling locking mechanism of the injection mold, the locking block is located in the locking end of the guide slide groove when the mold is closed, and the end of the locking block extends out of the locking groove and is located in the positioning groove. At this time, the locking block locks the slide on the mold, thereby locking the inclined top during injection molding, preventing the inclined top from retreating due to the injection pressure during core pulling, preventing the injection molded product from moving, ensuring the beauty and uniformity of product molding, and improving the qualified rate of injection molded products; when the oil cylinder drives the slide to move, the movement of the slide needs to overcome the elastic force of the spring and compress the spring. At this time, the speed of the slide movement can be reduced, thereby reducing the core pulling speed of the inclined top, buffering the core pulling process of the inclined top, preventing the inclined top from pulling too fast and causing the product to stick to the inclined top, resulting in product demolding failure; at the same time, the elastic force of the compressed spring is released when the mold is closed to help the slide to quickly reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the core-pulling locking mechanism of the injection mold.

[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the core-pulling locking mechanism of the injection mold in the mold.

[0016] In the figure, 1, oil cylinder; 2, mounting block; 21, sliding groove; 22, mounting hole; 3, transmission block; 31, guide protrusion; 32, transmission step; 33, guide slide groove; 34, guide slider; 4, locking block; 41, guide surface; 5, slide seat; 51, I-shaped groove; 52, transmission slide groove; 53, locking groove; 6, inclined top; 7, spring. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] like Figure 1 and Figure 2 As shown, the core-pulling locking mechanism of the injection mold includes an oil cylinder 1, a transmission block 3, a locking block 4, a slide 5, and an inclined top 6. An inclined I-shaped groove 51 is formed at the end of the slide 5, and an I-shaped block is provided at the end of the corresponding inclined top 6. The inclined top 6 is slidably arranged on the slide 5 through the cooperation of the I-shaped block and the I-shaped groove 51. A transmission slide 52 is also formed on the slide 5, and locking grooves 53 are formed on the groove walls on both sides of the transmission slide 52. The two locking grooves 53 are connected to the transmission slide 52. The transmission block 3 is slidably arranged in the transmission slide 52, and two locking blocks 4 are provided. The locking blocks 4 are slidably arranged in the locking grooves 53. A guide protrusion 31 is formed on the transmission block 3, and a transmission step 32 is formed between the guide protrusion 31 and the transmission block 3. Two relatively inclined guide slides 33 are formed on the guide protrusion 31, and one end of the locking block 4 is located in the transmission slide 52 and is formed with an inclined guide surface 41, and the guide surface 41 is in close contact with the groove wall of the guide slide 33.

[0019] The ends of the two guide slots 33 that are close to each other are the core pulling ends, and the ends of the two guide slots 33 that are away from each other are the locking ends. Two positioning slots that are connected to the locking slots 53 are formed on the mold. When the mold is closed, the locking block 4 is located in the locking end of the guide slot 33, and the end of the locking block 4 extends out of the locking slot 53 and is located in the positioning slot. At this time, the locking block 4 locks the slide 5 on the mold, thereby locking the inclined top during injection molding, preventing the inclined top from retreating due to the injection molding pressure during core pulling, preventing the injection molded product from being out of shape, ensuring the beauty and uniformity of product molding, and improving the qualified rate of injection molded products.

[0020] The piston rod of the oil cylinder 1 is connected to the transmission block 3. After the mold is opened, the oil cylinder 1 drives the transmission block 3 to move in the transmission chute 52, and the two locking blocks 4 move from the locking end to the core-pulling end along the groove wall of the inclined guide chute 33, that is, the two locking blocks 4 move toward each other, and the ends of the locking blocks 4 gradually disengage from the positioning groove. When the transmission block 3 moves to the transmission step 32 and contacts the bottom of the transmission chute 52, the locking block 4 has completely disengaged from the positioning groove. At this time, the slide 5 is unlocked and can move relative to the mold. The oil cylinder 1 drives the slide 5 to move synchronously through the transmission block 3. Under the cooperation of the inclined I-shaped groove 51 and the I-shaped block, the slide 5 drives the inclined top 6 to pull the core.

[0021] When the mold is closed, the oil cylinder 1 drives the transmission block 3 to move and reset in the transmission slide groove 52, and the transmission block 3 drives the two locking blocks 4 to move backwards. When the locking block 4 moves to its end and contacts the inner wall of the mold, the two locking blocks 4 stop moving backwards, and at this time the transmission block 3 stops moving relative to the transmission block 3; the oil cylinder 1 continues to drive the transmission block 3 to move, and the transmission block 3 drives the slide 5 to move and reset through the locking block 4, and the slide 5 drives the inclined top 6 to move and reset, until the slide 5 moves to the locking groove 53 and the positioning groove are aligned, at which time the slide 5 and the inclined top 6 are reset in place and stop moving; the transmission block 3 continues to move in the transmission slide groove 52 and drives the two locking blocks 4 to continue to move backwards, and the end of the locking block 4 extends out of the locking groove 53 and enters the positioning groove, completing the locking of the transmission block 3 and the inclined top 6.

[0022] The above technical solution also includes a mounting block 2 fixed on the mold, a sliding groove 21 is formed in the mounting block 2, and a mounting hole 22 is formed at the bottom of the sliding groove 21. The slide 5 is slidably arranged in the sliding groove 21, and the piston rod of the oil cylinder 1 passes through the mounting hole 22 and is connected to the transmission block 3. The oil cylinder 1 drives the slide 5 to move through the transmission block 3, and when the oil cylinder 1 drives the slide 5 to move until the slide 5 contacts the bottom of the sliding groove 21, the slide 5 stops moving. The bottom of the sliding groove 21 limits the movement of the slide 5, and the groove wall of the sliding groove 21 guides the movement of the slide 5.

[0023] In the above technical solution: a spring 7 is sleeved on the piston rod of the oil cylinder 1, and the spring 7 is located in the sliding groove 21. The diameter of the spring 7 is larger than the width of the mounting hole 22 and the width of the bottom surface of the transmission block 3. The two ends of the spring 7 are in contact with the bottom of the sliding groove 21 and the bottom surface of the slide 5 respectively. When the oil cylinder 1 drives the transmission block 3 to move, the spring 7 will not be compressed, and the spring 7 is still in an extended state; when the oil cylinder 1 drives the slide 5 to move, the movement of the slide 5 needs to overcome the elastic force of the spring 7 and compress the spring 7, at this time, the speed of the slide 5 movement can be reduced, thereby reducing the core pulling speed of the inclined top 6, buffering the core pulling process of the inclined top 6, and preventing the inclined top 6 from pulling the core too fast and causing the product to stick to the inclined top 6, resulting in product demoulding failure. At the same time, the elastic force of the compressed spring 7 is released when the mold is closed to help the slide 5 to reset quickly.

[0024] In the above technical solution, an inclined guide slider 34 is formed on the side of the guide slot 33, and the inclination angle of the guide slider 34 is the same as the inclination angle of the guide slot 33. A guide groove for the guide slider 34 to enter is formed on the lock block 4, and the guide slider 34 and the guide groove cooperate to guide the movement of the lock block 4 relative to the transmission block 3.

[0025] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0026] Although the terms such as oil cylinder 1, mounting block 2, sliding groove 21, mounting hole 22, transmission block 3, guide protrusion 31, transmission step 32, guide slide groove 33, guide slide block 34, locking block 4, guide surface 41, slide seat 5, I-shaped groove 51, transmission slide groove 52, locking groove 53, inclined top 6, spring 7 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0027] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. The specific embodiments described in this article are only used to illustrate the spirit of the utility model. The technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar way, but they will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

Claims

1. The core-pulling locking mechanism of the injection mold is characterized by The invention comprises an oil cylinder (1), a transmission block (3), a locking block (4), a slide seat (5), and an inclined top (6). The piston rod of the oil cylinder (1) is connected to the transmission block (3). The inclined top (6) is slidably arranged on the slide seat (5). The slide seat (5) is provided with a transmission slide groove (52). The groove walls on both sides of the transmission slide groove (52) are provided with locking grooves (53) connected to the transmission slide groove (52). The mold is provided with two positioning grooves connected to the locking groove (53). The transmission block (3) is slidably arranged on the slide seat (5). In the transmission slide groove (52), the transmission block (3) is formed with two relatively inclined guide slide grooves (33), and the locking block (4) is provided with two. The locking block (4) is slidably arranged in the locking groove (53), one end of the locking block (4) is located in the transmission slide groove (52) and is formed with an inclined guide surface (41), and the guide surface (41) is tightly attached to the groove wall of the guide slide groove (33). When the mold is closed, the other end of the locking block (4) extends out of the locking groove (53) and is located in the positioning groove.

2. The core-pulling locking mechanism of the injection mold according to claim 1, characterized in that The ends of the two guide grooves (33) that are close to each other are the core-pulling ends, and the ends of the two guide grooves (33) that are away from each other are the locking ends. When the mold is closed, the locking block (4) is located in the locking end of the guide groove (33). After the mold is opened, the oil cylinder (1) drives the transmission block (3) to move in the transmission groove (52), and the two locking blocks (4) move from the locking end to the core-pulling end along the inclined groove wall of the guide groove (33). The two locking blocks (4) move toward each other, and the ends of the locking blocks (4) gradually leave the positioning groove.

3. The core-pulling locking mechanism of the injection mold according to claim 1, characterized in that The transmission block (3) is provided with a guide protrusion (31), a transmission step (32) is formed between the guide protrusion (31) and the transmission block (3), and the guide slide groove (33) is located on the guide protrusion (31); The oil cylinder (1) drives the transmission block (3) to move, and when the transmission block (3) moves to the point where the transmission step (32) contacts the bottom of the transmission slide groove (52), the oil cylinder (1) drives the slide seat (5) to move synchronously via the transmission block (3).

4. The core-pulling locking mechanism of the injection mold according to claim 3, characterized in that The invention also comprises a mounting block (2) fixed on the mold, wherein a sliding groove (21) is formed in the mounting block (2), and a mounting hole (22) is formed at the bottom of the sliding groove (21), and the slide seat (5) is slidably arranged in the sliding groove (21), and the piston rod of the oil cylinder (1) passes through the mounting hole (22) and is connected to the transmission block (3), and the oil cylinder (1) drives the slide seat (5) to move through the transmission block (3), and when the slide seat (5) moves to the point where the slide seat (5) contacts the bottom of the sliding groove (21), the slide seat (5) stops moving.

5. The core-pulling locking mechanism of the injection mold according to claim 4, characterized in that A spring (7) is sleeved on the piston rod of the oil cylinder (1), and the spring (7) is located in the sliding groove (21). The diameter of the spring (7) is greater than the width of the mounting hole (22) and the width of the end face of the transmission block (3). The two ends of the spring (7) are respectively in contact with the bottom of the sliding groove (21) and the slide seat (5). When the oil cylinder (1) drives the transmission block (3) to move, the spring (7) is still in an extended state; when the oil cylinder (1) drives the slide seat (5) to move, the spring (7) is compressed.

6. The core-pulling locking mechanism of the injection mold according to claim 1, characterized in that An inclined I-shaped groove (51) is formed at the end of the slide seat (5), and an I-shaped block is provided at the corresponding end of the inclined top (6). The inclined top (6) is slidably arranged on the slide seat (5) through the cooperation of the I-shaped block and the I-shaped groove (51).

7. The core-pulling locking mechanism of the injection mold according to claim 1, characterized in that An inclined guide slide block (34) is formed on the side of the guide slide groove (33), and the inclination angle of the guide slide block (34) is the same as the inclination angle of the guide slide groove (33). The locking block (4) is formed with a guide groove for the guide slide block (34) to enter.

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