Expansion pipe injection mold

Abstract

The utility model discloses an expansion pipe injection mold. The expansion pipe injection mold comprises an upper mold base, a lower mold base, an ejector plate, an upper mold plate, a lower mold plate, an upper mold core and a lower mold core, a cavity is formed between the upper mold core and the lower mold core and is used for molding a product; an ejector pin is arranged on the ejector pin plate and is used for ejecting a product; sliding blocks are arranged on the two sides of the upper mold core and the lower mold core, the sliding blocks are arranged on the lower mold plate in a sliding mode, a plurality of core rods are arranged on the sliding blocks, the core rods freely rotate in the sliding blocks, and threads are formed in the ends of the core rods and used for forming threads on the inner wall of a product; a gear is arranged on the outer wall of the core rod, a rack meshed with the gear is arranged at the bottom of the core rod on each side, the racks move to drive the core rod to rotate and retreat, so that a core is pulled from a product, and the core pulling mold is reasonable in design, compact in structure, easy and convenient to operate, high in automation degree and stability and suitable for large-scale production and application.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and in particular relates to an expansion tube injection mold. Background Art

[0002] Expansion tubes are a commonly used building fixing part, widely used in fixing operations of concrete, brick walls and other substrates. The traditional expansion tube production process mainly relies on manual operation or simple mechanical equipment. This production method not only has low production efficiency, but also unstable product quality, which is difficult to meet the needs of large-scale production. In addition, the traditional expansion tube molding process cannot effectively guarantee the accuracy and consistency of the inner wall thread, which easily leads to poor fixing effect of the expansion tube in actual use.

[0003] At present, injection molding technology has been widely used in the production of expansion tubes. Injection molding technology can achieve efficient and high-precision production, improve product quality and production efficiency. However, there are still some problems in the design and use of existing injection molds. For example, when molding the inner wall threads of the product, a fixed core rod is usually used for molding. This method is difficult to ensure the accuracy and consistency of the threads. In addition, when performing core pulling operations, traditional molds often rely on simple mechanical structures or manual operations, which can easily cause jamming between the core rod and the product, affecting production efficiency and product quality. Utility Model Content

[0004] In order to solve the above problems, the utility model provides an expansion tube injection mold, which has reasonable mold design, compact structure, simple operation, high degree of automation and stability, and is suitable for large-scale production applications.

[0005] The technical solution provided by the utility model is as follows:

[0006] An expansion tube injection mold, comprising an upper mold base, a lower mold base, an ejector plate, an upper mold plate, a lower mold plate, an upper mold core and a lower mold core;

[0007] A cavity is provided between the upper die and the lower die for molding the product;

[0008] The ejector plate is arranged on the lower die base, and an ejector is arranged on the ejector plate for ejecting the product;

[0009] Slide blocks are provided on both sides of the upper die core and the lower die core. The slide blocks are slidably arranged on the lower die plate. A number of core rods are provided on the slide blocks. The core rods rotate freely in the slide blocks. The ends of the core rods are provided with threads for forming threads on the inner wall of the product.

[0010] The outer wall of the core rod is provided with a gear, and the bottom of each side of the core rod is provided with a rack meshing with the gear. The movement of the rack drives the core rod to rotate and withdraw, thereby pulling the core out of the product.

[0011] In some embodiments, the two racks move in opposite directions, a driving gear is provided between the two racks, the two racks are provided with saw teeth on the sides close to the driving gear, the driving gear is meshed with the two racks at the same time, and a motor is connected to the bottom of the driving gear.

[0012] In some embodiments, a first inclined surface is provided on the outer side of the top of the slider, and a second inclined surface matching the first inclined surface is provided on the bottom of the upper mold plate. When the mold is closed, the second inclined surface pushes the first inclined surface to push the slider toward one side of the cavity.

[0013] In some embodiments, a pad is provided on the first inclined surface.

[0014] In some embodiments, a stopper is provided on the outer side of the lower template, a horizontal guide column is provided on the outer side of the slide block, the guide column passes through the stopper and slides in the stopper, a circle of flange is provided at the end of the guide column, and a first spring is provided between the flange and the stopper.

[0015] In some embodiments, a protrusion for limiting the sliding block is provided on the lower template, a deep hole is opened at the bottom of the sliding block, a second spring is fixed in the deep hole, and the other end of the second spring abuts against the side of the protrusion.

[0016] In some embodiments, the slider has an installation groove on one side close to the cavity, a mandrel seat is provided in the installation groove, the mandrel is rotatably connected to one side of the mandrel seat, a limiting sleeve is provided on the other side of the mandrel seat, and the limiting sleeve is fixedly connected to the mandrel.

[0017] In summary, the beneficial effects of the utility model are as follows:

[0018] (1) The utility model mold has a reasonable design, compact structure, easy operation, high degree of automation and stability, and is suitable for large-scale production applications. The rack and the gear on the surface of the mandrel are set, and the mandrels on both sides of the mold core are driven to rotate and exit through the movement of the rack, so that two groups or multiple expansion tube products can be formed at the same time, thereby improving production efficiency.

[0019] (2) The utility model drives the gears on both sides of the racks to move in opposite directions, ensuring that the mandrels on both sides rotate in the same direction and the molded products are the same. The driving gear enables the movement of the racks on both sides to be synchronized, and the core is pulled at the same time, which improves the stability of the core pulling.

[0020] (3) The first spring and the second spring of the utility model assist the opening of the slider to prevent damage to the rack and the gear due to the force applied only to the rack and the gear during core pulling, thereby increasing the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2This is a schematic diagram of the cross-sectional structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the slider core rod of the utility model;

[0025] Figure 5 This is a schematic diagram of the core rod installation structure of the utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the slider of the utility model;

[0027] Figure 7 This is a schematic diagram of the product structure of the utility model.

[0028] The reference numerals are as follows:

[0029] 1. Upper die seat; 2. Lower die seat; 3. Ejector plate; 4. Upper die plate; 5. Lower die plate; 6. Upper die core; 7. Lower die core; 8. Ejector; 9. Product; 10. Slider; 11. Mandrel; 12. Gear; 13. Rack; 14. Driving gear; 15. Motor; 16. First inclined surface; 17. Second inclined surface; 18. Stopper; 19. Guide column; 20. Flange; 21. First spring; 22. Protrusion; 23. Deep hole; 24. Second spring; 25. Mounting groove; 26. Mandrel seat; 27. Limit sleeve; 28. Pad. DETAILED DESCRIPTION

[0030] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0031] Example 1

[0032] like Figure 1-7 As shown, an expansion tube injection mold is provided with an upper mold base 1, an upper mold plate 4, a lower mold plate 5 and a lower mold base 2 from top to bottom, an upper mold core 6 and a lower mold core 7 are arranged between the upper mold plate 4 and the lower mold plate 5, and a cavity is provided between the upper mold core 6 and the lower mold core 7 for molding a product 9. In this embodiment, the product 9 is an expansion tube, and the product 9 has threads inside. The core rod 11 for molding the internal threads needs to be rotated and withdrawn after the mold is opened. The mold provided in this application can simultaneously mold two groups or multiple expansion tube products. Therefore, sliders 10 are provided on both sides of the upper mold core 6 and the lower mold core 7 in this application. The sliders 10 are slidably arranged on the lower mold plate 5 through slide rails and slide grooves, and the sliders 10 on both sides are away from or close to the lower mold core 7 at the same time.

[0033] The slider 10 is provided with a plurality of core rods 11 , which are freely rotatable in the slider 10 , and the ends of the core rods 11 are provided with threads. During injection molding, the ends of the core rods 11 extend into the mold cavity to form threads on the inner wall of the molded product 9 .

[0034] A gear 12 is provided on the outer wall of the core rod 11, and a rack 13 meshing with the gear 12 is provided at the bottom of each side of the core rod 11. The movement of the rack 13 drives the core rod 11 to rotate and withdraw from the product, thereby realizing core pulling.

[0035] Furthermore, the slider 10 has a mounting groove 25 on one side close to the cavity, a core rod seat 26 is provided in the mounting groove 25, the core rod 11 is rotatably connected to one side of the core rod seat 26, and a limiting sleeve 27 is provided on the other side of the core rod seat 26, and the limiting sleeve 27 is fixedly connected to the core rod 11.

[0036] The material of the core rod seat 26 in this embodiment is copper, and a plurality of through holes are opened on the core rod seat 26, the number of the through holes is the same as the number of the core rod 11, the core rod 11 passes through the through holes and can rotate freely in the through holes, and the limit sleeve 27 is fixed to the core rod 11 by screws to prevent the core rod 11 from moving along its axial direction in the slider 10, thereby ensuring the molding accuracy of the core rod 11.

[0037] In this embodiment, a first inclined surface 16 is provided on the outer side of the top of the slider 10, and a second inclined surface 17 matching the first inclined surface 16 is provided on the bottom of the upper mold plate 4. When the mold is closed, the first inclined surface 17 and the first inclined surface 16 are fitted together, and the second inclined surface 17 pushes the first inclined surface 16 to push the slider 10 toward one side of the cavity. There is no need for manual or other driving mechanisms to push the slider 10, thereby improving the efficiency of mold closing.

[0038] Furthermore, a pad 28 is provided on the first inclined surface 16 . The pad 28 has a smooth surface. On the one hand, it can prevent the upper mold plate 4 from crushing the slider 10 , and on the other hand, it can make the slider 10 be pushed more smoothly.

[0039] The working principle of this embodiment:

[0040] When closing the mold, the second inclined surface 17 on the upper mold plate 4 fits with the first inclined surface 16, and the upper mold plate 4 pushes the sliders 10 on both sides to move relative to each other. After the sliders 10 are in place, the rack 13 is moved to reset, so that the core rod 11 on the slider 10 extends into between the upper mold core 6 and the lower mold core 7. The gap between the upper mold core 6, the lower mold core 7 and the core rod 11 forms the cavity of the product 9, completing the mold closing and starting injection molding.

[0041] After the injection molding is completed, the upper mold base 1 and the upper mold plate 4 move to open the mold. After the upper mold base 1 and the upper mold plate 4 are opened, the rack 13 is moved, the rack 13 drives the core rod 11 to rotate, and the core rod 11 drives the slider 10 to move to both sides, and the core rod 11 withdraws from the product 9. After the core rod 11 withdraws, the ejector plate 3 pushes up, and the ejector 8 ejects the product 9 to complete the demoulding.

[0042] Example 2

[0043] This embodiment is formed on the basis of the embodiment 1, and the core pulling of the mandrel 11 is made more stable by providing a driving mechanism of the rack 13. Specifically:

[0044] The two racks 13 move in opposite directions. A driving gear 14 is provided between the two racks 13 . The two racks 13 are provided with saw teeth on the sides close to the driving gear 14 . The driving gear 14 meshes with the two racks 13 at the same time. A motor 15 is connected to the bottom of the driving gear 14 .

[0045] The motor 15 drives the driving gear 14 to rotate, and the driving gear 14 drives the racks 13 on both sides to move in opposite directions, ensuring that the rotation directions of the mandrels 11 on both sides are the same and the formed products 9 are the same. The driving gear 14 synchronizes the movement of the racks 13 on both sides, and the core is pulled at the same time, which improves the stability of the core pulling.

[0046] Example 3

[0047] This embodiment is formed on the basis of the embodiment 1 or the embodiment 2, and a spring is provided to assist the opening of the slider 10 to prevent the rack 13 and the gear 14 from being damaged when only the rack 13 and the gear 14 are stressed during the core pulling. Specifically:

[0048] A stopper 18 is provided on the outer side of the lower template 5, and a horizontal guide column 19 is provided on the outer side of the slider 10. The guide column 19 passes through the stopper 18 and slides in the stopper 18. A circle of flange 20 is provided at the end of the guide column 19, and a first spring 21 is provided between the flange 20 and the stopper 18.

[0049] When the mold is closed, the flange 20 pulls the first spring 21 to be compressed toward the side of the stopper 18, and when the mold is opened, the first spring 12 returns to its original position and pushes the slider 10 to open.

[0050] The lower template 5 is provided with a protrusion 22 for limiting the slider 10 . The slider 10 has a deep hole 23 at the bottom. A second spring 24 is fixed in the deep hole 23 . The other end of the second spring 24 abuts against the side of the protrusion 22 .

[0051] When the mold is closed, the slider 10 compresses the second spring 24 toward the protrusion 22 , and when the mold is opened, the second spring 24 returns to its original position to drive the slider 10 to open.

[0052] The first spring 21 and the second spring 24 assist the opening of the slider 10 to prevent the rack 13 and the gear 14 from being damaged when only the rack 13 and the gear 14 are subjected to force during core pulling.

[0053] It should be noted that the implementation methods not shown or described in the drawings or the text of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments.

[0054] It should also be noted that this document may provide demonstrations of parameters containing specific values, but these parameters do not need to be exactly equal to the corresponding values, but can be approximated to the corresponding values ​​within an acceptable error tolerance or design constraint. Directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", etc., are only referenced to the directions of the drawings and are not intended to limit the scope of protection of this application.

[0055] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. An expansion tube injection mold, characterized in that: It comprises an upper die base (1), a lower die base (2), an ejector plate (3), an upper die plate (4), a lower die plate (5), an upper die core (6) and a lower die core (7); A cavity is provided between the upper mold core (6) and the lower mold core (7) for molding a product (9); The ejector plate (3) is arranged on the lower die base (2), and an ejector (8) is provided on the ejector plate (3) for ejecting the product (9); Slide blocks (10) are provided on both sides of the upper mold core (6) and the lower mold core (7). The slide blocks (10) are slidably arranged on the lower mold plate (5). A plurality of core rods (11) are provided on the slide blocks (10). The core rods (11) are freely rotatable in the slide blocks (10). The ends of the core rods (11) are provided with threads for forming threads on the inner wall of the product (9). The outer wall of the core rod (11) is provided with a gear (12), and the bottom of each side of the core rod (11) is provided with a rack (13) meshing with the gear (12). The movement of the rack (13) drives the core rod (11) to rotate and withdraw, thereby pulling the core out of the product (9).

2. The expansion tube injection mold according to claim 1, characterized in that: The two racks (13) move in opposite directions, a driving gear (14) is provided between the two racks (13), saw teeth are provided on the sides of the two racks (13) close to the driving gear (14), the driving gear (14) is meshed with the two racks (13) at the same time, and a motor (15) is connected to the bottom of the driving gear (14).

3. The expansion tube injection mold according to claim 1, characterized in that: A first inclined surface (16) is provided on the outer side of the top of the slider (10), and a second inclined surface (17) matching the first inclined surface (16) is provided on the bottom of the upper mold plate (4); when the mold is closed, the second inclined surface (17) pushes the first inclined surface (16) to push the slider (10) toward one side of the cavity.

4. The expansion tube injection mold according to claim 3, characterized in that: A pad (28) is provided on the first inclined surface (16).

5. The expansion tube injection mold according to claim 3, characterized in that: A stopper (18) is provided on the outer side of the lower template (5), a transverse guide column (19) is provided on the outer side of the slider (10), the guide column (19) passes through the stopper (18) and slides in the stopper (18), a flange (20) is provided at the end of the guide column (19), and a first spring (21) is provided between the flange (20) and the stopper (18).

6. The expansion tube injection mold according to claim 5, characterized in that: The lower template (5) is provided with a protrusion (22) for limiting the position of the slider (10), and the bottom of the slider (10) is provided with a deep hole (23). A second spring (24) is fixed in the deep hole (23), and the other end of the second spring (24) is in contact with the side of the protrusion (22).

7. The expansion tube injection mold according to claim 1, characterized in that: The slider (10) is provided with a mounting groove (25) on a side close to the mold cavity, a mandrel seat (26) is provided in the mounting groove (25), the mandrel (11) is rotatably connected to one side of the mandrel seat (26), a limiting sleeve (27) is provided on the other side of the mandrel seat (26), and the limiting sleeve (27) is fixedly connected to the mandrel (11).

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