Straight ejection inclined core-pulling structure

Abstract

The invention relates to a straight ejection inclined core-pulling structure which comprises an ejection block mold core, a core-pulling groove is formed in the forming face of the ejection block mold core, a first insert is arranged in the core-pulling groove in a matched and sliding mode, an ejection block cavity is formed in the ejection block mold core, a push rod is arranged on the first insert, and the push rod sequentially penetrates out of the core-pulling groove and the end, away from the core-pulling groove, of the ejection block cavity. A rack is embedded in the side wall of the first insert, a gear is rotationally arranged in the ejector block mold core, a guide sleeve is fixedly arranged on the gear in a penetrating mode, a second insert is arranged in the guide sleeve in a sliding mode, the second insert is in threaded connection with the ejector block mold core, and an ejector rod is arranged on the bottom face of the ejector block mold core. The first insert slides to perform inclined core pulling, and the rack on the side wall of the first insert drives the guide sleeve and the second insert to synchronously rotate through the gear, so that rotary demolding is realized, namely, inclined core pulling demolding of the inclined side face inverted buckle and rotary demolding of the side face threaded hole are simultaneously completed, a motor is not needed, and the size of the mold is reduced.

Description

Technical Field

[0001] The invention relates to the field of injection molds, and more particularly to a straight ejection and inclined core pulling structure. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding are fast production speed, high efficiency, automated operation, a wide variety of colors, shapes from simple to complex, sizes from large to small, and precise product size. The product is easy to update and can be made into complex-shaped parts. Injection molding is widely used in the molding and processing fields of mass production and complex-shaped products.

[0003] In the process of injection molding, products often encounter structures such as undercuts on the oblique side and threaded holes on the side. The demolding of the undercuts on the oblique side of the product requires forced demolding or setting an oblique core-pulling structure on the demolding mechanism. The threaded holes on the side require forced demolding or rotating the inserts driven by a motor to separate the inserts from the threaded holes. Forced demolding can easily cause deformation or damage to the undercuts on the oblique side and the threaded holes on the side of the product, while the rotary demolding by a motor increases the volume of the mold. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, a straight ejection and inclined core pulling structure is provided.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a straight ejection and oblique core pulling structure, comprising a top block mold core, a molding surface of the top block mold core is provided with an inclined core pulling groove, the core pulling groove is matched and slidably provided with a first insert, a top block cavity coaxial with the core pulling groove is provided in the top block mold core, a push rod is provided at one end of the first insert away from the molding surface of the top block mold core, the push rod sequentially passes through the core pulling groove and the end of the top block cavity away from the core pulling groove, a stopper is provided at the position where the push rod passes through the core pulling groove, a spring is provided between the stopper and the top block cavity, a rack is embedded on the side wall of the first insert, a gear meshing with the rack is rotatably provided in the top block mold core, a guide sleeve is fixedly provided on the axis of the gear, a second insert is slidably provided in the guide sleeve and rotates synchronously with the guide sleeve, the second insert is threadedly connected to the top block mold core, and a push rod is provided on the bottom surface of the top block mold core.

[0006] Preferably, a limiting groove extending along the axis of the guide sleeve is provided on the inner side wall of the guide sleeve, and a limiting piece matching and sliding in the limiting groove is provided on the second insert.

[0007] Preferably, the second insert includes a sliding portion, a molding thread portion, a connecting thread portion and an insert shaft, the sliding portion is slidably arranged in the guide sleeve, the limiter is arranged on the side wall of the sliding portion, the insert shaft is coaxially arranged on the sliding portion, the molding thread portion is arranged on the side of the side wall of the insert shaft away from the sliding portion, the connecting thread portion is arranged on the side wall of the insert shaft, the connecting thread portion is spaced apart from the molding thread portion, and the connecting thread portion is threadably connected to the top block mold core.

[0008] Preferably, the limiting member is a slide rail with an elongated structure.

[0009] Preferably, the stopper is arranged at one end of the push rod away from the first insert, the end of the top block cavity away from the core pulling groove is an open structure, the top block cavity is radially recessed outward at the opening position to form a stopper groove, and the spring sleeve is arranged on the push rod.

[0010] Preferably, the tooth top of the rack is not higher than the side wall of the first insert.

[0011] Preferably, a strip groove is provided on the side wall of the first insert, the rack is arranged at the bottom of the strip groove, and the top of the rack is located in the strip groove.

[0012] Preferably, the top block mold core is provided with an avoidance through hole between the rack and the gear, and the gear teeth of the gear pass through the avoidance through hole to mesh with the rack.

[0013] The beneficial effect of the present invention is that the ejector rod lifts the ejector mold core, and at this time the first insert slides under the action of the block and the spring, thereby performing oblique core pulling. During the sliding process of the first insert, the rack on the side wall of the first insert drives the guide sleeve to rotate through the gear, and the second insert rotates synchronously with the guide sleeve and slides in the guide sleeve, thereby rotating and demolding. That is, the present invention simultaneously completes the oblique core pulling demolding of the oblique side surface and the rotational demolding of the side threaded hole, and does not require a motor, thereby reducing the volume of the mold. After the product is demolded, the ejector rod drives the ejector mold core to descend, and the first insert is pressed by other mold cores to push the push rod to reset, and the rack drives the guide sleeve to reverse through the gear, thereby allowing the second insert to rotate and reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic cross-sectional structure diagram of an embodiment of the present invention;

[0015] Figure 2 Embodiment of the present invention Figure 1 A magnified schematic diagram of the middle A area;

[0016] Figure 3 Schematic diagram of the rotary demoulding structure according to an embodiment of the present invention.

[0017] Figure numerals: 1 ejector mold core, 10 core-pulling groove, 11 ejector cavity, 12 avoidance through hole, 13 block groove, 2 first insert, 20 push rod, 21 block, 22 strip groove, 3 spring, 4 rack, 40 gear, 5 guide sleeve, 50 limit groove, 6 second insert, 60 sliding part, 61 molding threaded part, 62 connecting threaded part, 63 insert shaft, 7 ejector rod, 8 limiter. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be clearly and completely described in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention. In addition, the directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only referenced to the directions of the attached diagrams. The directional terms used are for better and clearer explanation and understanding of the present invention, rather than indicating or implying the orientation that the present invention must have, and therefore cannot be understood as limitations on the present invention.

[0019] Embodiments of the present invention Figures 1 to 3As shown in the figure, a straight ejection oblique core pulling structure comprises a top block mold core 1, an inclined core pulling groove 10 is arranged on the molding surface of the top block mold core 1, the core pulling groove 10 is inclined from the upper left to the lower right, a first insert 2 is matched and slidably arranged in the core pulling groove 10, a top block cavity 11 coaxial with the core pulling groove 10 is arranged in the top block mold core 1, the core pulling groove 10 and the top block cavity 11 are spaced apart, the top block cavity 11 is located at the lower right of the core pulling groove 10, and the top block cavity 11 is provided at the lower right of the core pulling groove 10. 1 is also inclined from the upper left to the lower right, and a push rod 20 is arranged at one end of the first insert 2 away from the molding surface of the top block mold core 1, that is, the push rod 20 is arranged on the end surface of the lower right of the first insert 2, and the push rod 20 sequentially passes through the core-pulling groove 10 and the top block cavity 11 away from the end of the core-pulling groove 10, that is, the push rod 20 sequentially passes through the lower right end of the core-pulling groove 10 and the lower right end of the top block cavity 11. Preferably, the push rod 20 is a rectangular parallelepiped structure, so as to prevent the first insert 2 from rotating , resulting in defective products. A stopper 21 is provided at the position where the push rod 20 passes through the core-pulling groove 10. A spring 3 is provided between the stopper 21 and the top block cavity 11. A rack 4 is embedded on the side wall of the first insert 2. The upper left end of the rack 4 is spaced from the molding surface of the top block mold core 1, so as not to affect the sealing of the first insert 2 and the core-pulling groove 10, thereby preventing burr defects in the product. A gear 40 meshing with the rack 4 is rotatably provided in the top block mold core 1, and a guide sleeve 5 is fixedly penetrated on the axis of the gear 40. The guide sleeve 5 extends in the front and rear directions. A second insert 6 that rotates synchronously with the guide sleeve 5 is slidably provided in the guide sleeve 5. The second insert 6 also extends in the front and rear directions. The second insert 6 is threadedly connected to the top block mold core 1. When the second insert 6 is reset, the second insert 6 rotates and is threadedly connected to the top block mold core 1 through the second insert 6 so that the second insert 6 slides and resets in the guide sleeve 5. A push rod 7 is provided on the bottom surface of the top block mold core 1.

[0020] The ejector pin 7 lifts the ejector mold core 1, and the first insert 2 slides under the action of the stopper 21 and the spring 3, thereby performing oblique core pulling. During the sliding of the first insert 2, the rack 4 on the side wall of the first insert 2 drives the guide sleeve 5 to rotate through the gear 40, and the second insert 6 rotates synchronously with the guide sleeve 5 and slides in the guide sleeve 5, thereby performing rotational demoulding. That is, the present invention simultaneously completes the oblique core pulling demoulding of the oblique side surface undercut and the rotational demoulding of the side threaded hole, and does not require a motor, thereby reducing the size of the mold. After the product is demoulded, the ejector pin 7 drives the ejector mold core 1 to descend, and the first insert 2 is reset by the push rod 20 pressed by other mold cores, and the rack 4 drives the guide sleeve 5 to reverse through the gear 40, thereby allowing the second insert 6 to rotate and reset.

[0021] Further improvements such as Figures 1 to 3As shown in the figure, a limiting groove 50 extending along the axis of the guide sleeve 5 is provided on the inner wall of the guide sleeve 5, and both ends of the limiting groove 50 in the extending direction are open, so as to facilitate the installation of the second insert 6, and a limiting member 8 matching and sliding in the limiting groove 50 is provided on the second insert 6, and the limiting member 8 is a slide rail with a long strip structure. Through the limiting groove 50 and the slide rail, the second insert 6 can rotate synchronously with the guide sleeve 5 without affecting the sliding of the second insert 6 in the guide sleeve 5.

[0022] Further improvements such as Figure 2 and Figure 3 As shown in the figure, the second insert 6 includes a sliding portion 60, a forming thread portion 61, a connecting thread portion 62 and an insert shaft 63. The sliding portion 60 is slidably arranged in the guide sleeve 5. The limiter 8 is arranged on the side wall of the sliding portion 60. The insert shaft 63 is coaxially arranged on the sliding portion 60. The forming thread portion 61 is arranged on the side wall of the insert shaft 63 away from the sliding portion 60. The product is formed into a thread structure by the forming thread portion 61. The connecting thread portion 62 is arranged on the side wall of the insert shaft 63. The connecting thread portion 62 and the forming thread portion are connected to each other. The grooves 61 are arranged at intervals, and when the product is formed, the interval between the connecting thread portion 62 and the molding thread portion 61 is sealed with glue to prevent burrs. The connecting thread portion 62 is threadedly connected to the top block mold core 1, that is, the second insert 6 is threadedly connected to the top block mold core 1 through the connecting thread portion 62. The specifications of the threads of the connecting thread portion 62 and the molding thread portion 61 are the same, and the length of the connecting thread portion 62 is greater than the length of the molding thread portion 61. When the second insert 6 rotates, it is threadedly connected to the top block mold core 1 through the connecting thread portion 62 to move in the horizontal direction.

[0023] Further improvements such as Figure 1 As shown in the figure, the stopper 21 is arranged at the end of the push rod 20 away from the first insert 2, that is, the stopper 21 is arranged at the lower right end of the push rod 20, and the end of the top block cavity 11 away from the core pulling groove 10 is an open structure, that is, the lower right end of the top block cavity 11 is an open structure, and the top block cavity 11 is radially recessed outward at the opening position with a stopper groove 13, and the stopper 21 cooperates with the stopper groove 13 to limit the first insert 2, and at the same time, the stopper groove 13 accommodates the stopper 21 to avoid interference between the stopper 21 and other mold cores, and the spring 3 is sleeved on the push rod 20.

[0024] Further improvements such as Figure 1 and Figure 2As shown in the figure, the tooth top of the rack 4 is not higher than the side wall of the first insert 2, a strip groove 22 is provided on the side wall of the first insert 2, the rack 4 is arranged at the bottom of the strip groove 22, the tooth top of the rack 4 is located in the strip groove 22, the rack 4 is embedded in the side wall of the first insert 2 through the strip groove 22, and the tooth top of the rack 4 is located in the strip groove 22 to prevent the gear teeth on the rack 4 from affecting the sliding of the first insert 2 in the core-pulling groove 10.

[0025] Further improvements such as Figure 1 and Figure 2 As shown in FIG. 1 , the top block mold core 1 is provided with an avoidance through hole 12 between the rack 4 and the gear 40 , and the gear teeth of the gear 4 pass through the avoidance through hole 12 and mesh with the rack 40 .

[0026] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A straight ejection and oblique core pulling structure, comprising an ejector mold core; characterized in that: An inclined core-pulling groove is provided on the molding surface of the top block mold core; a first insert is slidingly arranged in the core-pulling groove; a top block cavity coaxial with the core-pulling groove is provided in the top block mold core; a push rod is provided at the end of the first insert away from the molding surface of the top block mold core; the push rod passes through the core-pulling groove and the end of the top block cavity away from the core-pulling groove in turn; a stopper is provided at the position where the push rod passes through the core-pulling groove; a spring is provided between the stopper and the top block cavity; a rack is embedded on the side wall of the first insert; a gear meshing with the rack is rotatably arranged in the top block mold core; a guide sleeve is fixedly arranged on the axis of the gear; a second insert is slidingly arranged in the guide sleeve, which rotates synchronously with the guide sleeve; the second insert is threadedly connected to the top block mold core; a push rod is provided on the bottom surface of the top block mold core.

2. A straight ejection and oblique core pulling structure according to claim 1, characterized in that: The inner side wall of the guide sleeve is provided with a limiting groove extending along the axis of the guide sleeve; the second insert is provided with a limiting piece matching and sliding in the limiting groove.

3. A straight ejection and oblique core pulling structure according to claim 2, characterized in that: The second insert includes a sliding part, a molding thread part, a connecting thread part and an insert shaft; the sliding part is slidably arranged in the guide sleeve; the limiter is arranged on the side wall of the sliding part; the insert shaft is coaxially arranged on the sliding part; the molding thread part is arranged on the side of the side wall of the insert shaft away from the sliding part; the connecting thread part is arranged on the side wall of the insert shaft; the connecting thread part and the molding thread part are spaced apart; the connecting thread part is threadedly connected to the top block mold core.

4. A straight ejection and oblique core pulling structure according to claim 2, characterized in that: The limiting member is a slide rail with an elongated structure.

5. The straight ejection and oblique core pulling structure according to claim 1 is characterized in that: The stopper is arranged at one end of the push rod away from the first insert; the end of the top block cavity away from the core-pulling groove is an open structure; the top block cavity is radially recessed outward at the opening position to form a stopper groove; the spring sleeve is arranged on the push rod.

6. The straight ejection and oblique core pulling structure according to claim 1, characterized in that: The tooth top of the rack is not higher than the side wall of the first insert.

7. A straight ejection and oblique core pulling structure according to claim 6, characterized in that: A strip groove is arranged on the side wall of the first insert; the rack is arranged at the bottom of the strip groove; and the top of the rack is located in the strip groove.

8. The straight ejection and oblique core pulling structure according to claim 1, characterized in that: The top block mold core is provided with an avoidance through hole between the rack and the gear; the gear teeth of the gear pass through the avoidance through hole and mesh with the rack.

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