Threaded cap injection mold

Abstract

The utility model discloses a threaded cap injection mold which comprises an upper mold plate, a lower mold plate, an upper mold base, a lower mold base and a mold core, the mold core is fixed on the lower mold base, the top of the mold core is located in the upper mold plate and used for forming a product, a sleeve is rotationally arranged on the outer side of the mold core, and threads are arranged on the outer wall of the top of the sleeve and used for forming threads in the product. According to the injection mold, by optimizing the mold structure and the design of a demolding mechanism, the demolding efficiency and the product quality are improved, the service life of the mold is prolonged, and the injection mold is suitable for large-scale production and application.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and particularly relates to an injection mold for a screw cap. Background Art

[0002] The screw cap is a product widely used in daily life and is widely used in the packaging of industries such as food, beverage, cosmetics, and medicine. The production process of the screw cap has an important impact on the product quality and production efficiency. At present, the manufacture of the screw cap mainly relies on injection molding technology, and the molten plastic material is injected into the mold cavity through an injection mold and forms a screw cap after cooling. The design and manufacture of the injection mold directly affect the forming quality and production efficiency of the screw cap. There are some problems with the common screw cap injection molds on the market at present, such as difficult demolding, low production efficiency, easy wear of the mold, etc., which are difficult to meet the requirements of high-efficiency production and long-life use.

[0003] Traditional screw cap injection molds usually adopt an integral mold structure, that is, the mold core and the mold cavity are integrated, and the forming and demolding of the product are realized through the opening and closing of the mold. This design needs to overcome a large screw resistance during the demolding process, which easily causes product deformation or damage, and the mold wears faster. In addition, due to the relative movement of the mold core and the mold cavity when the mold opens and closes, the design of the cooling system inside the mold is relatively complex, which affects the cooling efficiency, thereby affecting the production cycle and product quality.

[0004] To solve these problems, some improved designs have emerged in recent years, such as split mold structures, rotary demolding mechanisms, etc. These improvements have improved the demolding efficiency and mold life to a certain extent, but there are still some deficiencies. For example, the split mold structure is prone to friction during demolding, resulting in mold wear, and the stability and reliability of the rotary demolding mechanism still need to be improved.

[0005] In addition, the cooling process of the screw cap has a direct impact on the forming time and product quality. Traditional injection molds often have deficiencies in cooling design, with slow cooling speed, uneven cooling, which easily leads to difficult guarantee of the dimensional accuracy and appearance quality of the product, thus affecting the use performance and market competitiveness of the screw cap. The existing cooling system design is still difficult to balance the smoothness of the demolding process while ensuring the cooling efficiency. Summary of the Utility Model

[0006] To solve the above problems, the utility model provides an injection mold for a screw cap, which improves the demolding efficiency and product quality, extends the service life of the mold, and is suitable for large-scale production applications by optimizing the mold structure and the design of the demolding mechanism.

[0007] The technical solution provided by the utility model is as follows:

[0008] A screw cap injection mold includes an upper template, a lower template, an upper mold base, a lower mold base, and a mold core. The mold core is fixed on the lower mold base, and the top of the mold core is located inside the upper template for forming a product. A sleeve is rotatably provided outside the mold core, and a thread is provided on the outer wall of the top of the sleeve for forming the thread inside the product. A plurality of ejector pins are fixed on the lower template, and a cavity is formed by leaving a gap between the upper template and the mold core, the sleeve, and the ejector pins.

[0009] In some embodiments, a toothed disc is provided at the bottom of the sleeve, and the toothed disc is connected to the output end of the motor through a chain.

[0010] In some embodiments, the upper part of the sleeve has a flange, and a plurality of balls are provided at the bottom of the flange. The sleeve is rotatably arranged on the lower template through the balls.

[0011] In some embodiments, a first sliding sleeve is provided between the inner wall of the sleeve and the mold core.

[0012] In some embodiments, a second sliding sleeve is provided between the outer wall of the sleeve and the lower template.

[0013] In some embodiments, a cavity is provided inside the mold core, a baffle is provided in the middle of the cavity, and flow channels communicating with each other are formed on both sides of the baffle.

[0014] In summary, the beneficial effects of the present utility model are as follows:

[0015] (1) The present utility model realizes the demolding of the product through the cooperation of the limit of the ejector pin and the rotation of the sleeve, and has a simple structure, which is suitable for popularization.

[0016] (2) The present utility model provides a cavity and flow channels inside the mold core, which can accelerate the cooling of the product, improve the injection molding efficiency. At the same time, since the mold core and the sleeve are separately arranged, the rotation of the sleeve will not interfere with the inlet and outlet of the flow channels during the rotational demolding, ensuring the normal operation of the flow channels.

[0017] (3) The present utility model reduces the friction between the rotating sleeve and the mold core, the lower template, and the lower mold base by providing balls, a first sliding sleeve, and a second sliding sleeve, improves the demolding efficiency, and also reduces the wear of the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional schematic diagram of the sectional structure of the present utility model;

[0019] Figure 2 is a schematic diagram of the sectional structure of the present utility model;

[0020] Figure 3 is a schematic diagram of the internal structure of the present utility model;

[0021] Figure 4 is a schematic diagram of the mold core structure of the present utility model;

[0022] Figure 5 Schematic diagram of the sleeve structure of the present utility model;

[0023] Figure 6 Schematic diagram of the product structure of the present utility model;

[0024] The reference numerals are as follows:

[0025] 1. Upper template; 2. Lower template; 3. Upper die holder; 4. Lower die holder; 5. Mold core; 6. Product; 7. Sleeve; 8. Ejector pin; 9. Gear disk; 10. Flange; 11. Ball; 12. First sliding sleeve; 13. Second sliding sleeve; 14. Cavity; 15. Baffle. Specific embodiments

[0026] In order to deepen the understanding of the present utility model, the present utility model will be further described in detail below in conjunction with embodiments and the accompanying drawings. The embodiments are only used to explain the present utility model and do not limit the protection scope of the present utility model.

[0027] Embodiment 1

[0028] As Figure 1-6 shown, a screw cap injection mold mainly includes an upper template 1, a lower template 2, an upper die holder 3, a lower die holder 4 and a mold core 5. The upper die holder 3, the upper template 1, the lower template 2 and the lower die holder 4 are arranged in sequence from top to bottom. An upper backing plate is connected between the upper die holder 3 and the upper template 1, and a lower backing plate is connected below the lower template 2. The mold core 5 is fixed on the lower die holder 4, and the top of the mold core 5 is located within the upper template 1 for forming the product 6. Please refer to Figure 6 . The product 6 injection molded in this embodiment is a circular structure with internal threads. The shape of the mold core 5 in this embodiment is T-shaped. The upper end of the T-shape is used to form the inner wall of the product 6. A sleeve 7 is rotatably arranged outside the mold core 5. The sleeve 7 is separately arranged from the mold core 5. The outer wall of the top of the sleeve 7 is provided with threads for forming the threads on the vertical surface of the inner wall of the product 6. A plurality of ejector pins 8 are fixed on the lower template 2. A cavity is formed by leaving a gap between the upper template 1 and the mold core 5, the sleeve 7 and the ejector pins 8. The injection port passes through the upper die holder 3, the upper backing plate and the upper template 1, and the product 6 is formed in the cavity.

[0029] During mold opening, the upper template 1 and the lower template 2 are separated, and the upper template 1 is separated from the upper surface of the formed product 6. At this time, the rotating sleeve 7 starts to rotate. Since the ejector pin 8 is inserted into the product 6, the product 6 cannot rotate with the sleeve 7. Therefore, the product 6 is ejected upward from the sleeve 7 under the action of the threads until it is completely separated from the sleeve 7 and the mold core 5, completing the demolding of the product 6. This solution realizes the demolding of the product 6 through the cooperation of the limit of the ejector pin 8 and the rotation of the sleeve 7. The structure is simple and suitable for popularization.

[0030] Further, a toothed disc 9 is provided at the bottom of the sleeve 7, and the toothed disc 9 is connected to the output end of the motor through a chain. In this embodiment, the motor is matched with a speed reducer, and together with the transmission cooperation of the chain and the toothed disc 9, the demolding of the product 6 is more stable.

[0031] Embodiment 2

[0032] This embodiment is formed on the basis of Embodiment 1. By arranging a cavity 14 and a runner in the mold core 5, the cooling of the product 6 can be accelerated, and the injection molding efficiency is improved. Specifically:

[0033] Please refer to Figure 2 、 4 , a cavity 14 is provided in the mold core 5, a baffle 15 is provided in the middle of the cavity 14, and the runner is formed on both sides of the baffle 15. The two sides of the bottom of the cavity 14 are respectively the outlet and the inlet of the runner.

[0034] Since the mold core 5 and the sleeve 7 are separately arranged, during the rotary demolding, the rotation of the sleeve 7 will not interfere with the inlet and outlet of the runner, ensuring the normal operation of the runner.

[0035] Embodiment 3

[0036] This embodiment is formed on the basis of Embodiment 1 or Embodiment 2. By further setting the structure of the sleeve 7, the stability of the sleeve 7 during rotation is improved. Specifically:

[0037] The upper part of the sleeve 7 has a flange 10, and a plurality of balls 11 are provided at the bottom of the flange 10. The sleeve 7 is rotatably arranged on the lower template 2 through the balls 11.

[0038] The sleeve 7 is placed on the lower template 2 through the balls 11. When the sleeve 7 rotates, the balls 11 at the bearing stress position reduce the friction between the flange 10 and the lower template 2, improve the demolding efficiency, and also reduce the wear of the sleeve 7.

[0039] Further, a first sliding sleeve 12 is provided between the inner wall of the sleeve 7 and the mold core 5, and a second sliding sleeve 13 is provided between the outer wall of the sleeve 7 and the lower template 2.

[0040] The functions of the first sliding sleeve 12 and the second sliding sleeve 13 in this embodiment are similar to those of the balls 11, which are used to reduce the friction between the inner wall of the sleeve 7 and the mold core 5, reduce the friction between the outer wall of the sleeve 7 and the lower template 2 and the lower mold base 4, reduce the wear of the sleeve 7, and improve the service life of the mold.

[0041] It should be noted that in the drawings or the text of the specification, the implementation manners that are not depicted or described are all forms known to those of ordinary skill in the art in the technical field to which they belong, and no detailed description is given. In addition, the above definitions of the various elements and methods are not limited to the specific structures, shapes or manners mentioned in the embodiments.

[0042] It should also be noted that this article can provide demonstrations of parameters containing specific values. However, these parameters do not need to be exactly equal to the corresponding values, but can approximate the corresponding values within an acceptable error tolerance or design constraint. Directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., are only references to the directions in the accompanying drawings and are not used to limit the protection scope of this application.

[0043] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in the relevant field. And any changes and variations made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A screw cap injection mold, characterized in that: The invention comprises an upper mold plate (1), a lower mold plate (2), an upper mold base (3), a lower mold base (4) and a mold core (5); the mold core (5) is fixed on the lower mold base (4); the top of the mold core (5) is located in the upper mold plate (1) for molding a product (6); a sleeve (7) is rotatably provided on the outer side of the mold core (5); a thread is provided on the outer wall of the top of the sleeve (7) for molding the thread in the product (6); a plurality of ejector pins (8) are fixed on the lower mold plate (2); and a gap is left between the upper mold plate (1) and the mold core (5), the sleeve (7) and the ejector pins (8) to form a mold cavity.

2. The screw cap injection mold according to claim 1, characterized in that: A toothed disc (9) is provided at the bottom of the sleeve (7), and the toothed disc (9) is connected to the output end of the motor via a chain.

3. The screw cap injection mold according to claim 1, characterized in that: The upper part of the sleeve (7) is provided with a circle of flange (10), and the bottom of the flange (10) is provided with a plurality of balls (11). The sleeve (7) is rotatably arranged on the lower template (2) through the balls (11).

4. The screw cap injection mold according to claim 3, characterized in that: A first sliding sleeve (12) is provided between the inner wall of the sleeve (7) and the mold core (5).

5. The injection mold for the threaded cap according to claim 3, characterized in that: A second sliding sleeve (13) is provided between the outer wall of the sleeve (7) and the lower template (2).

6. The injection mold for the threaded cap according to claim 1, characterized in that: A cavity (14) is provided in the mold core (5), a baffle (15) is provided in the middle of the cavity (14), and communicating flow channels are formed on both sides of the baffle (15).

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