Middle shell injection mold

Abstract

The utility model discloses a middle shell injection mold and belongs to the field of mold manufacturing, the middle shell injection mold comprises a bottom plate, a top plate, an upper mold block, a lower mold block, a water diversion plate and two supporting blocks, the two supporting blocks are fixedly connected to the two ends of the bottom plate respectively, a connecting plate is arranged between the two supporting blocks, and a plurality of ejector pins are connected to the connecting plate; the two ends of the water distribution plate are fixedly connected to the two supporting blocks respectively, the upper module is connected with the top plate, the lower module is connected with the water distribution plate, a plurality of mounting holes are formed in the water distribution plate, the number and the positions of the mounting holes correspond to those of the ejector pins, and the ejector pins penetrate through the mounting holes and are communicated with the interior of the lower module; a guide groove is formed in the inner wall of the mounting hole, the side wall of the guide block is slidably connected to the inner wall of the guide groove, and the diameter of the ejector pin is smaller than that of the mounting hole. The ejector pin has the effect of prolonging the service life of the ejector pin.

Description

Technical Field

[0001] The present application relates to the technical field of mold manufacturing, and in particular to a middle shell injection mold. Background Art

[0002] In the machinery manufacturing industry, injection molds are widely used in the production of various plastic products. They are important tools for achieving the shape and dimensional accuracy of plastic parts. Molds are tools used to form objects through methods such as injection molding, blow molding, extrusion, die casting or forging, smelting, and stamping. With the development of industrial manufacturing technology, the application of injection molds in the manufacturing industry is becoming more and more extensive. As the core component of many products, the design and manufacturing quality of the injection mold directly affects the quality of the product and production efficiency.

[0003] During the demolding process, the mold utilizes an ejector pin. This cylindrical pin is installed in the mold, which has a mounting hole for it. When the molded part needs to be ejected, the pin extends from the mounting hole, ejecting the part and completing the demolding process. As the ejector pin moves back and forth, it rubs against the inner surface of the mounting hole, causing scratches and roughening on the outer surface of the pin rod. This wear and tear significantly shortens the life of the ejector pin, and consequently, the life of the mold. Utility Model Content

[0004] In order to increase the service life of the ejector pin and thus increase the service life of the mold, the present application provides a middle shell injection mold.

[0005] The present application provides a middle shell injection mold adopting the following technical solution:

[0006] A middle shell injection mold includes a bottom plate, a top plate, an upper module, a lower module, a water diversion plate, and two support blocks, the two support blocks are respectively fixedly connected to the two ends of the bottom plate, a connecting plate is provided between the two support blocks, a plurality of ejector pins are connected to the connecting plate, the two ends of the water diversion plate are respectively fixedly connected to the two support blocks, the upper module is connected to the top plate, the lower module is connected to the water diversion plate, a plurality of mounting holes are provided in the water diversion plate, the number and position of the mounting holes correspond to the plurality of ejector pins, the ejector pin is passed through the mounting hole and communicates with the interior of the lower module; a guide block is fixedly connected to the side wall of the ejector pin, a guide groove is provided on the inner wall of the mounting hole, the side wall of the guide block is slidably connected to the inner wall of the guide groove, and the diameter of the ejector pin is smaller than the diameter of the mounting hole.

[0007] By adopting the above technical solution, during demolding, the connecting plate moves to drive the ejector to move and eject the model. When the ejector moves in the mounting hole, the guide block moves in the guide groove, and the ejector has zero contact with the inner wall of the mounting hole, thereby achieving zero friction for the ejector, thereby reducing the possibility of the ejector becoming rough due to friction and causing damage, and then increasing the service life of the ejector.

[0008] Preferably, a groove is provided on the side wall of the guide block, a rotating rod is connected in the groove, a ball is rotatably mounted on the rotating rod, and the ball is rollingly connected to the inner wall of the guide groove.

[0009] By adopting the above technical solution, when the ejector moves, the ball rolls and connects to the inner wall of the guide groove, thereby reducing the friction between the guide block and the inner wall of the guide groove, thereby reducing the rate of wear of the guide block.

[0010] Preferably, a storage groove is provided in the guide block, a slider slides in the storage groove, the end of the rotating rod is passed through a groove and is fixedly connected to the slider, a first spring is provided in the storage groove, and the two ends of the first spring are respectively fixedly connected to the slider and the inner wall of the storage groove.

[0011] By adopting the above technical solution, after the ball moves in the guide groove for a long time, the ball will wear and become smaller. When the ball is worn, the slider drives the rotating rod to move outward under the push of the first spring, so that the ball moves outward and always abuts against the inner wall of the guide groove, thereby reducing the possibility of the guide block and the ejector pin shaking.

[0012] Preferably, a limiting groove is provided in the guide block, a limiting rod and a limiting block slide in the limiting groove, a limiting groove is provided on the inner wall of the limiting groove, the limiting block slides in the limiting groove, the limiting rod is fixedly passed through the limiting block, and both ends of the limiting rod are passed through the first spring and fixedly connected to the slider.

[0013] By adopting the above technical solution, when the slider moves, it will push the limiting rod to move together, and the movement of the limiting rod will drive the limiting block to move. Since the limiting block is limited in the limiting groove and can only move in a straight line, the possibility of the limiting rod rotating is limited, and the sliders on both sides of the rotating rod are required to be kept on the same horizontal line, thereby reducing the possibility of the rotating rod tilting.

[0014] Preferably, a transition groove is provided on the inner wall of the mounting hole, the transition groove is connected to the guide groove, one inner wall of the transition groove is inclined, the diameter of the transition groove gradually decreases towards the storage groove, and the ball is pressed against the inner wall of the transition groove.

[0015] By adopting the above technical solution, when the staff installs the ejector pin in the mounting hole, the guide block on the ejector pin is aligned with the transition groove, which plays a guiding role in the installation of the ejector pin. The larger diameter of the transition groove facilitates the installation of the guide block and the ball. During the installation of the ejector pin, the ball presses against the inclined inner wall of the transition groove, and pushes the ball to drive the rotating rod to compress the first spring to move, so that the ball is completely hidden in the groove and the guide block is inserted into the guide groove. The ball compresses the first spring to press against the inner wall of the guide groove, thereby limiting the movement of the guide block.

[0016] Preferably, the connecting plate is provided with a plurality of sockets for the insertion of the ejector pins, a placement groove is provided in the ejector pin, and plug blocks are provided in the placement groove to slide back to back or towards each other, the plug block is provided with an inclined surface, a second spring is provided in the placement groove, and the two ends of the second spring are respectively fixedly connected to the two opposite side walls of the plug blocks, and an annular groove for the insertion of the plug block is provided on the inner wall of the socket, the plug block slides in the annular groove, and a pull block slides in the placement groove, the pull block and the two plug blocks are hinged by a connecting rod, a pull rod is fixedly connected to the pull block, and the pull rod slides on the side wall of the ejector pin, a third spring is provided in the placement groove, and the two ends of the third spring are respectively connected to the pull block and the inner wall of the placement groove.

[0017] By adopting the above technical solution, the second spring can buffer the ejector when the ejector moves to be demolded. When installing the ejector, when the ejector is inserted into the socket, the inclined surface on the insert block abuts against the socket and compresses the second spring. When the ejector is fully inserted into the socket, the insert block is inserted into the annular groove under the action of the second spring. When the staff then inserts the ejector into the installation hole, they can rotate the ejector to align the guide block with the direction of the guide groove, thereby facilitating installation by the staff.

[0018] Preferably, a protective sleeve is provided on the ejector pin, and the two ends of the protective sleeve are respectively abutted against the water diversion plate and the connecting plate. The protective sleeve is retractable and includes a main pipe and a telescopic pipe. A sliding groove is provided in the main pipe, and the telescopic pipe slides in the sliding groove. A fourth spring is provided in the sliding groove, and the two ends of the fourth spring are respectively fixedly connected to the telescopic pipe and the inner wall of the sliding groove.

[0019] By adopting the above technical solution, when the ejector moves, the connecting plate will push the protective sleeve to compress and expand and contract along with the movement of the ejector, thereby reducing the possibility of the ejector being bent.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. During demolding, the connecting plate moves to drive the ejector pin to move and eject the part. When the ejector pin moves in the mounting hole, the guide block moves in the guide groove. This creates zero contact between the ejector pin and the inner wall of the mounting hole, thus achieving friction-free ejector pins. This reduces the possibility of damage due to friction and roughness, thereby increasing the ejector pin's service life.

[0022] 2. When the ejector moves, the ball rolls and connects to the inner wall of the guide groove, thereby reducing the friction between the guide block and the inner wall of the guide groove, thereby reducing the rate of wear of the guide block;

[0023] 3. After the ball moves in the guide groove for a long time, the ball will wear and become smaller. When the ball is worn, the slider drives the rotating rod to move outward under the push of the first spring, so that the ball moves outward and always abuts against the inner wall of the guide groove, thereby reducing the possibility of the guide block and the ejector pin shaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of a middle shell injection mold.

[0025] Figure 2 It is a structural schematic diagram of the protruding guide block in an embodiment of the present application.

[0026] Figure 3 It is a schematic structural diagram of the protruding ball in the embodiment of the present application.

[0027] Figure 4 It is a structural diagram of the protruding plug in the embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1. Bottom plate; 2. Top plate; 3. Upper module; 4. Lower module; 5. Water distribution plate; 6. Support block; 7. Connecting plate; 8. Ejector pin; 9. Mounting hole; 10. Guide block; 11. Guide groove; 12. Groove; 13. Turning rod; 14. Ball; 15. Storage groove; 16. Slider; 17. First spring; 18. Limiting groove; 19. Limiting block; 20. Limiting rod; 21. Limiting groove; 22. Transition groove; 23. Socket; 24. Placement groove; 25. Insert block; 26. Inclined surface; 27. Second spring; 28. Ring groove; 29. ​​Pull rod; 30. Pull block; 31. Connecting rod; 32. Main pipe; 33. Telescopic pipe; 34. Fourth spring; 35. Third spring; 36. Moving groove; 37. Protective cover. DETAILED DESCRIPTION

[0030] The embodiment of the present application discloses a middle shell injection mold, such as Figure 1 and Figure 2As shown, it includes a bottom plate 1, a top plate 2, an upper module 3, a lower module 4, a water distribution plate 5, and two support blocks 6, all of which are rectangular. The two support blocks 6 are fixedly welded to the two sides of the upper end surface of the bottom plate 1. A connecting plate 7 is provided between the two support blocks 6. The connecting plate 7 is rectangular. A plurality of ejector pins 8 are connected to the connecting plate 7. The ejector pins 8 are cylindrical, and their center lines are arranged in the vertical direction. The two sides of the lower end surface of the water distribution plate 5 are fixedly welded to the upper end surfaces of the two support blocks 6, the upper module 3 is fixedly welded to the lower end surface of the top plate 2, and the lower module 4 is fixedly welded to the upper end surface of the water distribution plate 5. An upper mold core is provided in the upper module 3, and a lower mold core is provided in the lower module 4. The upper module 3 and the lower module 4 are relatively abutted.

[0031] like Figure 1 and Figure 2 As shown, the water diversion plate 5 is provided with a plurality of mounting holes 9 in the vertical direction. The number and position of the mounting holes 9 correspond to the plurality of ejector pins 8. The ejector pins 8 are inserted into the mounting holes 9 and are connected to the lower mold core. The diameter of the ejector pins 8 is smaller than the diameter of the mounting holes 9. A guide block 10 is fixedly welded to the side wall of the ejector pin 8. A guide groove 11 is provided on the inner wall of the mounting hole 9. The guide block 10 slides in the guide groove 11 in the vertical direction. A transition groove 22 is provided on the inner wall of the mounting hole 9. The transition groove 22 is located below the guide groove 11 and is connected to the guide groove 11. The diameter of the end of the transition groove 22 away from the guide groove 11 is larger than the diameter of the guide groove 11. The inner wall of one side of the transition groove 22 is inclined, and the diameter gradually decreases toward the guide groove 11.

[0032] like Figure 2 and Figure 3 As shown, grooves 12 are formed on multiple side walls of the guide block 10. A rotating rod 13 is connected to the groove 12. Ball bearings 14 are rotatably mounted on the rotating rod 13, and the ball bearings 14 are rollingly connected to the inner wall of the guide groove 11. Storage grooves 15 are formed at both ends of the groove 12 in the guide block 10. Slide blocks 16 slide in the storage grooves 15. The two ends of the rotating rod 13 respectively penetrate the wall of the groove 12 and are fixedly welded to the slide blocks 16. A first spring 17 is disposed in the storage groove 15. The first spring 17 is arranged in the horizontal direction, and the two ends of the first spring 17 are respectively fixedly welded to the slide blocks 16 and the inner wall of the storage groove 15. A limiting groove 18 is provided in the guide block 10 in front of the storage groove 15, and a limiting rod 20 and a limiting block 19 slide in the limiting groove 18. The limiting rod 20 is U-shaped, and a limiting groove 21 is provided on the inner wall at the bottom of the limiting groove 18. The limiting block 19 slides in the limiting groove 21 and the two side walls of the limiting block 19 slide on the opposite side walls of the limiting groove 21. The limiting block 19 can only move linearly along the extension direction of the limiting groove 21. The limiting rod 20 is fixedly penetrated in the limiting block 19. Both ends of the limiting rod 20 are penetrated through the wall of the storage groove 15 and fixedly welded to the slider 16. The first spring 17 is sleeved on the limiting rod 20.

[0033] like Figure 2 and Figure 3As shown, during demolding, as ejector pin 8 moves within mounting hole 9, guide block 10 follows ejector pin 8 within guide groove 11. Ball bearings 14 on guide block 10 can abut against the inner wall of guide groove 11, thereby limiting the position of ejector pin 8 and reducing the possibility of ejector pin 8 swinging or deflecting. Confined by guide block 10, ejector pin 8 can move in a straight line with zero contact with the inner wall of mounting hole 9, achieving friction-free movement. This reduces the possibility of ejector pin 8 becoming rough and potentially damaged due to friction, thereby increasing its service life. Simultaneously, ball bearings 14 roll within guide block 10, reducing friction between guide block 10 and the inner wall of guide groove 11, thereby minimizing obstacles to ejector pin 8's movement. After the ball 14 has moved repeatedly, its surface will wear out, reducing its diameter. At this point, the slider 16, propelled by the first spring 17, drives the rotating rod 13 outward. As the slider 16 moves, it also drives the limiting rod 20, which in turn drives the limiting block 19. Because the limiting block 19 can only move in a straight line and the limiting rod 20 is made of a non-elastic material, it will not deviate. This limits the need for the sliders 16 at both ends of the rotating rod 13 to move synchronously, thereby reducing the possibility of the rotating rod 13 tilting. This allows the ball 14 to move outward and always abut against the inner wall of the guide groove 11, thereby reducing the possibility of the guide block 10 and, consequently, the ejector pin 8, shaking.

[0034] like Figure 2 and Figure 3 As shown, when the staff installs the ejector 8 in the mounting hole 9, the guide block 10 on the ejector 8 is aligned with the transition groove 22, which plays a guiding role in the installation of the ejector 8, and the transition groove 22 has a large diameter, which is convenient for the installation of the guide block 10 and the ball 14. During the installation of the ejector 8, the ball 14 is pressed against the inclined inner wall of the transition groove 22, and pushes the ball 14 to drive the rotating rod 13 to compress the first spring 17 to move, so that the ball 14 is completely hidden in the groove 12, and the guide block 10 is inserted into the guide groove 11. The ball 14 compresses the first spring 17 to abut against the inner wall of the guide groove 11, thereby limiting the movement of the guide block 10.

[0035] like Figure 2 and Figure 4As shown, the connecting plate 7 is provided with a plurality of sockets 23 for the ejector pins 8 to be plugged in, and a placement groove 24 is provided in the ejector pin 8. Insertion blocks 25 are slidably disposed in opposite directions or toward each other in the placement groove 24. The insertion blocks 25 are provided with an inclined surface 26. A second spring 27 is provided in the placement groove 24. The two ends of the second spring 27 are respectively fixedly welded to the opposite side walls of the two insertion blocks 25. An annular groove 28 for the insertion block 25 to be plugged in is provided on the inner wall of the socket 23, and the insertion block 25 slides in the annular groove 28. A pull block 30 slides vertically within the placement slot 24. The pull block 30 and the two insert blocks 25 are hingedly connected by a connecting rod 31. A third spring 35 is vertically disposed within the placement slot 24, its ends welded to the inner wall of the placement slot 24 and the top of the pull block 30, respectively. A pull rod 29 is welded to the side wall of the pull block 30. A movable groove 36 is defined on the side wall of the ejector pin 8 for the pull rod 29 to move through, but the pull rod 29 does not protrude from the movable groove 36. When the ejector pin 8 is inserted into the insertion hole 23, the inclined surface 26 on the insert block 25 abuts against the insertion hole 23, compressing the second spring 27. When the ejector pin 8 is fully inserted into the insertion hole 23, the insert block 25, under the action of the second spring 27, slides into the annular groove 28. When the operator subsequently inserts the ejector pin 8 into the mounting hole 9, the operator can rotate the ejector pin 8 to align the guide block 10 with the guide groove 11, facilitating installation. Once the ejector pin 8 is installed, the guide block 10 restricts its rotation.

[0036] like Figure 4 As shown, ejector pin 8 is covered with a protective sleeve 37. This sleeve 37 is retractable and includes a main pipe 32 and a telescopic pipe 33. The bottom end of the main pipe 32 abuts the connecting plate 7, while the top of the telescopic pipe 33 abuts the lower end surface of the water diversion plate 5. The ends of the protective sleeve 37 abut the water diversion plate 5 and the connecting plate 7, respectively. A circular sliding groove is vertically defined within the main pipe 32. The bottom of the telescopic pipe 33 slides vertically within the sliding groove. Multiple fourth springs 34 are vertically disposed within the sliding groove. The ends of the fourth springs 34 are fixedly welded to the telescopic pipe 33 and the inner wall of the sliding groove. When ejector pin 8 moves, the connecting plate 7 compresses the protective sleeve 37, causing it to expand and contract with the movement of ejector pin 8, thereby reducing the possibility of ejector pin 8 bending.

[0037] The implementation principle of the embodiment of the present application is as follows: during demolding, when ejector pin 8 moves within mounting hole 9, guide block 10 follows ejector pin 8 in guide groove 11. Ball bearings 14 on guide block 10 can abut against the inner wall of guide groove 11, thereby limiting the position of ejector pin 8 and reducing the possibility of ejector pin 8 shaking or deviating. Under the restriction of guide block 10, ejector pin 8 can move in a straight line with zero contact with the inner wall of mounting hole 9, thereby achieving friction-free ejector pin 8, thereby reducing the possibility of ejector pin 8 becoming rough due to friction and thus being damaged, and thus increasing the service life of ejector pin 8. At the same time, ball bearings 14 roll within guide block 10, thereby reducing friction between guide block 10 and the inner wall of guide groove 11, thereby reducing obstacles to the movement of ejector pin 8. After the ball 14 has moved many times, the surface of the ball 14 will be worn so that the diameter of the ball 14 will become smaller. At this time, the slider 16 drives the rotating rod 13 to move outward under the push of the first spring 17, so that the ball 14 moves outward and always abuts against the inner wall of the guide groove 11, thereby reducing the possibility of the guide block 10 and the ejector pin 8 shaking.

[0038] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A middle shell injection mold, comprising a bottom plate (1), a top plate (2), an upper module (3), a lower module (4), a water distribution plate (5), and two support blocks (6), wherein the two support blocks (6) are respectively fixedly connected to the two ends of the bottom plate (1), a connecting plate (7) is provided between the two support blocks (6), a plurality of ejector pins (8) are connected to the connecting plate (7), the two ends of the water distribution plate (5) are respectively fixedly connected to the two support blocks (6), the upper module (3) is connected to the top plate (2), the lower module (4) is connected to the water distribution plate (5), a plurality of mounting holes (9) are provided in the water distribution plate (5), the number and position of the mounting holes (9) correspond to the plurality of ejector pins (8), and the ejector pins (8) are passed through the mounting holes (9) and communicated with the interior of the lower module (4); characterized in that: A guide block (10) is fixedly connected to the side wall of the ejector pin (8), a guide groove (11) is provided on the inner wall of the mounting hole (9), the side wall of the guide block (10) is slidably connected to the inner wall of the guide groove (11), and the diameter of the ejector pin (8) is smaller than the diameter of the mounting hole (9).

2. The middle shell injection mold according to claim 1, characterized in that: A groove (12) is provided on the side wall of the guide block (10), a rotating rod (13) is connected in the groove (12), a ball (14) is rotatably mounted on the rotating rod (13), and the ball (14) is rollingly connected to the inner wall of the guide groove (11).

3. The middle shell injection mold according to claim 2, characterized in that: A storage groove (15) is provided in the guide block (10), a slider (16) slides in the storage groove (15), an end portion of the rotating rod (13) is provided with a groove (12) and is fixedly connected to the slider (16), a first spring (17) is provided in the storage groove (15), and two ends of the first spring (17) are respectively fixedly connected to the slider (16) and the inner wall of the storage groove (15).

4. The middle shell injection mold according to claim 3, characterized in that: A limiting groove (18) is provided in the guide block (10), a limiting rod (20) and a limiting block (19) are slidably provided in the limiting groove (18), a limiting groove (21) is provided on the inner wall of the limiting groove (18), the limiting block (19) slides in the limiting groove (21), the limiting rod (20) is fixedly provided in the limiting block (19), and both ends of the limiting rod (20) are provided in the first spring (17) and fixedly connected to the slider (16).

5. The middle shell injection mold according to claim 3, characterized in that: The inner wall of the mounting hole (9) is provided with a transition groove (22), the transition groove (22) is connected to the guide groove (11), one inner wall of the transition groove (22) is inclined, the diameter of the transition groove (22) gradually decreases toward the storage groove (15), and the ball (14) is pressed against the inner wall of the transition groove (22).

6. The middle shell injection mold according to claim 1, characterized in that: The connecting plate (7) is provided with a plurality of jacks (23) for the ejector pins (8) to be plugged in. A placement groove (24) is provided in the ejector pins (8). Insertion blocks (25) are slidably disposed in opposite directions or toward each other in the placement groove (24). The insertion blocks (25) are provided with inclined surfaces (26). A second spring (27) is provided in the placement groove (24). The two ends of the second spring (27) are respectively fixedly connected to the opposite side walls of the two insertion blocks (25). The inner wall of the jack (23) is provided with an annular groove (27) for the insertion block (25) to be plugged in. 8), the insert block (25) slides in the annular groove (28), a pull block (30) slides in the placement groove (24), the pull block (30) and the two insert blocks (25) are hinged by a connecting rod (31), a pull rod (29) is fixedly connected to the pull block (30), the pull rod (29) slides on the side wall of the ejector pin (8), a third spring (35) is provided in the placement groove (24), and the two ends of the third spring (35) are respectively fixedly connected to the pull block (30) and the inner wall of the placement groove (24).

7. The middle shell injection mold according to claim 1, characterized in that: The ejector pin (8) is provided with a protective sleeve (37), the two ends of the protective sleeve (37) respectively abut against the water distribution plate (5) and the connecting plate (7), the protective sleeve (37) is retractable, the protective sleeve (37) comprises a main pipe (32) and a telescopic pipe (33), a sliding groove is provided in the main pipe (32), the telescopic pipe (33) slides in the sliding groove, a fourth spring (34) is provided in the sliding groove, the two ends of the fourth spring (34) are respectively fixedly connected to the telescopic pipe (33) and the inner wall of the sliding groove.

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