Injection mold for thin-wall plastic shell cover production

Abstract

The utility model discloses an injection mold for producing a thin-wall plastic shell cover, which relates to the field of plastic shell cover production and comprises a mold main body, a mold core is fixedly mounted on the outer wall of the mold main body, an ejection mechanism is arranged in the mold main body and comprises a hydraulic cylinder fixedly mounted on the outer wall of the mold main body, and the hydraulic cylinder is fixedly mounted on the outer wall of the mold main body. A piston rod is arranged at the end of the hydraulic cylinder, a push plate is fixedly installed at the end of the piston rod, an ejection air cavity is formed in the mold body, ejection air holes are formed in the outer wall of the ejection air cavity, an ejection block is slidably installed on the outer wall of the mold core, a sliding block is fixedly installed on the outer wall of the ejection block, and a through groove is formed in the outer wall of the ejection block; and a cooling mechanism for dissipating heat of the mold core is arranged on the outer wall of the mold main body. According to the injection mold for producing the thin-wall plastic shell cover, by arranging the ejection mechanism, the separation efficiency of the thin-wall plastic shell cover and the mold core is improved, the demolding process becomes easy and convenient, the demolding time is effectively saved, and the production efficiency and the yield of finished products are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of plastic shell and cap production technology, specifically to an injection mold for producing thin-walled plastic shell and cap. Background Technology

[0002] Thin-walled plastic caps are lightweight, material-saving, and highly efficient in production. In the packaging industry, they are used in food and cosmetic packaging to ensure airtightness and enhance appearance. In the electronics industry, they meet the requirements for thin and light appearance of equipment and achieve electromagnetic shielding. In the medical industry, they make instruments lightweight and hygienic. Thin-walled plastic caps are widely used in many fields, and their production usually requires the use of injection molds.

[0003] In the prior art, Chinese Patent Publication No. CN220129371U discloses a mold for manufacturing plastic products. The top surface of the injection mold is provided with a sealing cover, the bottom surface of the hydraulic rod is provided with a clamping seat, the inner side of the bearing seat is provided with a base plate, the two ends of the base plate are provided with support rods, the bottom surface of the support rods is provided with a limit plate, the bottom surface of the bearing seat is provided with a fixing seat, the top surface of the bearing seat is provided with a reinforcing rod, and the side end of the injection mold is provided with an insert block. By tightly fitting the injection mold and the sealing cover together, gaps between the injection mold and the sealing cover can be avoided. The hydraulic rod and the electric push rod are used to drive the pressure plate and the clamping seat to move respectively, and clamp and fix the injection mold and the sealing cover respectively, thereby preventing the adhesive solution adhering to the mold from tearing the formed plastic product, thereby improving the molding rate between the injection molds.

[0004] Based on the above information, it can be seen that in the production of thin-walled plastic shells, the existing technology makes it difficult to separate the finished plastic shell from the mold core cavity because the finished plastic shell is thin and the outer wall is tightly attached to the outer wall of the mold core. This results in a time-consuming and labor-intensive demolding process, which in turn affects production efficiency and the yield rate of finished products. Therefore, we propose an injection mold for the production of thin-walled plastic shells. Utility Model Content

[0005] The purpose of this utility model is to provide an injection mold for producing thin-walled plastic shell caps, in order to solve the problem mentioned in the background art that, in the production of thin-walled plastic shell caps, the outer wall of the finished plastic shell is relatively thin and the outer wall of the mold core is closely attached, which is not conducive to the separation of the finished plastic shell from the molding cavity of the mold core, resulting in a time-consuming and labor-intensive demolding process, which in turn affects the production efficiency and the yield of finished products.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an injection mold for producing thin-walled plastic shell caps, comprising a mold body, a mold core fixedly installed on the outer wall of the mold body, and a sealing gasket provided on the outer wall of the mold core; an ejection mechanism for demolding the finished plastic shell cap is provided inside the mold body; the ejection mechanism comprises a hydraulic cylinder fixedly installed on the outer wall of the mold body, a piston rod provided at the end of the hydraulic cylinder, and a push plate fixedly installed at the end of the piston rod; an ejection air chamber is provided inside the mold body, and an ejection air hole is provided on the outer wall of the ejection air chamber; a guide rod is fixedly installed inside the ejection air chamber; a top block is slidably installed on the outer wall of the mold core, and a slider is fixedly installed on the outer wall of the top block; a through groove is opened on the outer wall of the top block; and a cooling mechanism for dissipating heat from the mold core is provided on the outer wall of the mold body.

[0007] Furthermore, the push plate is correspondingly arranged with the mold core, and the outer wall of the push plate is in contact with the inner wall of the mold body, and the outer wall of the push plate and the outer wall of the ejection air chamber are sealed.

[0008] Furthermore, the length of the guide rod is set to correspond to the length of the ejection air chamber, and the guide rod is set at an equal angle inside the mold body.

[0009] Furthermore, the ejector air chamber is provided correspondingly to the mold core, and the ejector air holes are provided at equal intervals on the outer wall of the mold core and inside the mold body. The ejector air holes penetrate the outer wall of the mold core, and the ends of the ejector air holes are connected to the inside of the ejector air chamber.

[0010] Furthermore, the top block is cylindrical in shape, and the outer diameter of the top block corresponds to the outer diameter of the vent hole. The through groove penetrates the outer wall of the top block, and the length of the through groove is less than the length of the top block. The slider is set at an equal angle on the outer wall of the top block, and the outer wall of the vent hole is provided with a groove corresponding to the slider. The length of the groove corresponds to the ejection range of the top block.

[0011] Furthermore, the cooling mechanism includes a cooling chamber opened inside the mold core, a cooling tank containing coolant is fixedly installed on the outer wall of the mold body, a circulating pump is fixedly installed on the top of the cooling tank, and a cooling pipe and a connecting pipe are fixedly installed at the end of the circulating pump. A return pipe is fixedly installed on the outer wall of the mold core, and a return pipe and a water inlet pipe are provided on the outer wall of the cooling tank.

[0012] Furthermore, the cooling chamber is a closed chamber, one end of the cooling pipe is connected to the interior of the cooling chamber, and the other end of the cooling pipe is connected to the circulating pump. One end of the return pipe is connected to the interior of the cooling chamber, and the other end of the return pipe is connected to the cooling box.

[0013] Furthermore, one end of the connecting pipe is connected to the cooling tank, and the other end of the connecting pipe is connected to the circulating pump, and the water inlet pipe is connected to an external cooling water source.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This injection mold for producing thin-walled plastic shell caps features an ejection mechanism. A hydraulic cylinder drives a piston rod, which in turn moves a push plate. The push plate pushes the gas in the ejection chamber, and the gas is ejected from the ejection vent. Simultaneously, the ejector block is ejected outward under the pressure of the gas in the ejection chamber and the guiding action of the slider and the groove. On the one hand, the gas ejected from the ejection vent can blow away the adhesion between the thin-walled plastic shell cap and the mold core; on the other hand, the ejector block can directly eject the plastic shell cap from inside the mold core. This dual action greatly improves the separation efficiency between the thin-walled plastic shell cap and the mold core, making the demolding process easy and convenient, effectively saving demolding time, and significantly improving production efficiency and product qualification rate.

[0016] 2. Equipped with a cooling mechanism, a circulating pump pumps coolant from the cooling tank into the cooling chamber inside the mold core through cooling pipes. The coolant circulates within the cooling chamber, carrying away the heat absorbed by the mold core during injection molding. It then flows back to the cooling tank through a return pipe, achieving coolant recycling. This efficient cooling system can quickly reduce the mold core temperature, allowing the thin-walled plastic shell cap to cool and solidify in a shorter time. This not only improves production efficiency but also effectively avoids quality problems such as product deformation caused by uneven cooling, ensuring the dimensional accuracy and appearance quality of the plastic shell cap, and further enhancing product quality and market competitiveness. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the mold body of this utility model;

[0019] Figure 3 This is a schematic diagram of the ejector air chamber, cooling chamber, and ejector air hole structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the ejection mechanism of this utility model;

[0021] Figure 5 This utility model Figure 4 Enlarged structural diagram at point A in the middle;

[0022] Figure 6 This is a schematic diagram of the cross-sectional structure of the mold core of this utility model;

[0023] Figure 7 This utility model Figure 6 Enlarged structural diagram at point B;

[0024] Figure 8This is a schematic diagram of the top block, slider, and through groove structure of this utility model.

[0025] In the diagram: 1. Mold body; 2. Mold core; 201. Slide groove; 3. Sealing gasket; 4. Hydraulic cylinder; 401. Piston rod; 402. Push plate; 403. Guide rod; 5. Ejection chamber; 501. Ejection hole; 6. Ejector block; 601. Slider; 602. Through groove; 7. Cooling chamber; 701. Cooling pipe; 702. Return pipe; 8. Cooling box; 801. Circulation pump; 802. Water inlet pipe; 803. Connecting pipe. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1: Please refer to Figure 1-8 This utility model provides the following technical solution: an injection mold for producing thin-walled plastic shell caps, comprising a mold body 1, a mold core 2 fixedly installed on the outer wall of the mold body 1, and a sealing gasket 3 provided on the outer wall of the mold core 2; an ejection mechanism for demolding the finished plastic shell caps provided inside the mold body 1, the ejection mechanism including a hydraulic cylinder 4 fixedly installed on the outer wall of the mold body 1, a piston rod 401 provided at the end of the hydraulic cylinder 4, and a push plate 402 fixedly installed at the end of the piston rod 401; an ejection air chamber 5 provided inside the mold body 1, and an ejection air hole 501 provided on the outer wall of the ejection air chamber 5; a guide rod 403 fixedly installed inside the ejection air chamber 5; a top block 6 slidably installed on the outer wall of the mold core 2, and a slider 601 fixedly installed on the outer wall of the top block 6; a through groove 602 opened on the outer wall of the top block 6; the push plate 402 is correspondingly arranged with the mold core 2, and the outer wall of the push plate 402 is in contact with the inner wall of the mold body 1. The outer wall of the push plate 402 and the outer wall of the ejector air chamber 5 are sealed together. The length of the guide rod 403 corresponds to the length of the ejector air chamber 5, and the guide rod 403 is set at equal angles inside the mold body 1. The ejector air chamber 5 corresponds to the mold core 2. The ejector air hole 501 is set at equal intervals on the outer wall of the mold core 2 and inside the mold body 1, and the ejector air hole 501 penetrates the outer wall of the mold core 2. The end of the ejector air hole 501 is connected to the inside of the ejector air chamber 5. The top block 6 is cylindrical in shape, and the outer diameter of the top block 6 corresponds to the outer diameter of the ejector air hole 501. The through groove 602 penetrates the outer wall of the top block 6, and the length of the through groove 602 is less than the length of the top block 6. The slider 601 is set at equal angles on the outer wall of the top block 6, and the outer wall of the ejector air hole 501 has a groove 201 corresponding to the slider 601. The length of the groove 201 corresponds to the ejection range of the top block 6.

[0028] After the thin-walled plastic shell cap is injection molded, the ejection mechanism begins to operate. First, the hydraulic cylinder 4 installed on the outer wall of the mold body 1 is activated. The thrust generated by the hydraulic cylinder 4 pushes the piston rod 401 out. The push plate 402, which is fixedly connected to the end of the piston rod 401, moves along a specific track inside the mold body 1 under the guidance of the guide rod 403, driven by the piston rod 401. The movement of the push plate 402 causes the gas in the ejection chamber 5 to be compressed. Since the ejection chamber 5 is connected to the ejection vents 501 on the mold core 2, and the ejection vents 501 are evenly distributed on the outer wall of the mold core 2, the gas under pressure... Gas is ejected at high speed through the ejector vent 501. This ejected gas acts on the surfaces where the thin-walled plastic shell cover and the mold core 2 are in contact, effectively blowing away the adsorption force generated by injection molding between the two. At the same time, under the direct action of the air pressure in the ejector vent 5 and the guidance of the slider 601 and the slide groove 201, the ejector block 6 is ejected outward along the inside of the mold core 2. The ejector block 6 acts directly on the plastic shell cover from the inside of the mold core 2. Together with the gas ejected from the ejector vent 501, the two work together to greatly improve the separation efficiency of the thin-walled plastic shell cover from the molding cavity of the mold core 2, completing an easy and convenient demolding process.

[0029] Example 2: Based on Example 1, a cooling mechanism is also disclosed, the specific structure of which is as follows: The outer wall of the mold body 1 is provided with a cooling mechanism for dissipating heat from the mold core 2. The cooling mechanism includes a cooling chamber 7 opened inside the mold core 2. A cooling tank 8 containing coolant is fixedly installed on the outer wall of the mold body 1, and a circulating pump 801 is fixedly installed on the top of the cooling tank 8. A cooling pipe 701 and a connecting pipe 803 are fixedly installed at the end of the circulating pump 801. A return pipe 702 is fixedly installed on the outer wall of the mold core 2. The outer wall of the cooling tank 8 is provided with a return pipe 702 and a water inlet pipe 802. The cooling chamber 7 is a closed chamber. One end of the cooling pipe 701 is connected to the inside of the cooling chamber 7, and the other end of the cooling pipe 701 is connected to the circulating pump 801. One end of the return pipe 702 is connected to the inside of the cooling chamber 7, and the other end of the return pipe 702 is connected to the cooling tank 8. One end of the connecting pipe 803 is connected to the cooling tank 8, and the other end of the connecting pipe 803 is connected to the circulating pump 801. The water inlet pipe 802 is connected to an external cooling water source.

[0030] When injection molding begins, the mold core 2 absorbs a large amount of heat due to the injection of high-temperature plastic. At this time, the cooling mechanism starts working. The cooling tank 8, which is fixedly installed on the outer wall of the mold body 1, stores coolant. The circulation pump 801 at the top of the cooling tank 8 starts. The circulation pump 801 draws coolant from the cooling tank 8 through the connecting pipe 803 and pumps the coolant into the cooling chamber 7 inside the mold core 2 through the cooling pipe 701. The cooling chamber 7 is a closed chamber in which the coolant circulates. During the circulation process, the coolant exchanges heat with the mold core 2, absorbing the heat generated by the injection molding, thereby reducing the temperature of the mold core 2. After absorbing heat, the coolant flows back to the cooling box 8 from inside the mold core 2 through the return pipe 702. The cooling box 8 is equipped with a water inlet pipe 802, which can be connected to an external cooling water source to replenish the coolant lost due to heat exchange, ensuring that the cooling system can operate continuously and stably. Through the circulation of coolant between the cooling box 8, cooling pipe 701, cooling chamber 7 and return pipe 702, the efficient cooling system can quickly remove the heat from the mold core 2, allowing the thin-walled plastic shell cover to cool and form evenly in a short time. This avoids quality problems such as product deformation caused by uneven cooling, and ensures the dimensional accuracy and appearance quality of the plastic shell cover.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An injection mold for producing thin-walled plastic shell caps, comprising a mold body (1), wherein a mold core (2) is fixedly installed on the outer wall of the mold body (1), and a sealing gasket (3) is provided on the outer wall of the mold core (2), and an ejection mechanism for demolding the finished plastic shell cap is provided inside the mold body (1), characterized in that: The ejection mechanism includes a hydraulic cylinder (4) fixedly installed on the outer wall of the mold body (1), and a piston rod (401) is provided at the end of the hydraulic cylinder (4), and a push plate (402) is fixedly installed at the end of the piston rod (401). The mold body (1) is provided with an ejection air chamber (5), and an ejection air hole (501) is provided on the outer wall of the ejection air chamber (5). A guide rod (403) is fixedly installed inside the ejection air chamber (5). A top block (6) is slidably installed on the outer wall of the mold core (2), and a slider (601) is fixedly installed on the outer wall of the top block (6). A through groove (602) is opened on the outer wall of the top block (6). A cooling mechanism for dissipating heat from the mold core (2) is provided on the outer wall of the mold body (1).

2. The injection mold for producing a thin-walled plastic shell cover according to claim 1, characterized in that: The push plate (402) is provided corresponding to the mold core (2), and the outer wall of the push plate (402) is in contact with the inner wall of the mold body (1), and the outer wall of the push plate (402) is sealed with the outer wall of the ejection air chamber (5).

3. The injection mold for producing a thin-walled plastic shell cover according to claim 1, characterized in that: The length of the guide rod (403) is set to correspond to the length of the ejection air chamber (5), and the guide rod (403) is set at equal angles inside the mold body (1).

4. The injection mold for producing a thin-walled plastic shell cover according to claim 1, characterized in that: The ejector air chamber (5) is provided in correspondence with the mold core (2). The ejector air hole (501) is provided at equal intervals on the outer wall of the mold core (2) and inside the mold body (1). The ejector air hole (501) penetrates the outer wall of the mold core (2), and the end of the ejector air hole (501) is connected to the inside of the ejector air chamber (5).

5. The injection mold for producing a thin-walled plastic shell cover according to claim 1, characterized in that: The top block (6) is cylindrical in shape, and the outer diameter of the top block (6) corresponds to the outer diameter of the vent hole (501). The through groove (602) penetrates the outer wall of the top block (6), and the length of the through groove (602) is less than the length of the top block (6). The slider (601) is set at an equal angle on the outer wall of the top block (6), and the outer wall of the vent hole (501) is provided with a groove (201) corresponding to the slider (601), and the length of the groove (201) corresponds to the ejection range of the top block (6).

6. The injection mold for producing a thin-walled plastic shell cover according to claim 1, characterized in that: The cooling mechanism includes a cooling chamber (7) opened inside the mold core (2), a cooling tank (8) containing coolant is fixedly installed on the outer wall of the mold body (1), a circulation pump (801) is fixedly installed on the top of the cooling tank (8), and a cooling pipe (701) and a connecting pipe (803) are fixedly installed at the end of the circulation pump (801). A return pipe (702) is fixedly installed on the outer wall of the mold core (2), and a return pipe (702) and a water inlet pipe (802) are provided on the outer wall of the cooling tank (8).

7. The injection mold for producing a thin-walled plastic shell cover according to claim 6, characterized in that: The cooling chamber (7) is a closed chamber. One end of the cooling pipe (701) is connected to the interior of the cooling chamber (7), and the other end of the cooling pipe (701) is connected to the circulating pump (801). One end of the return pipe (702) is connected to the interior of the cooling chamber (7), and the other end of the return pipe (702) is connected to the cooling box (8).

8. The injection mold for producing a thin-walled plastic shell cover according to claim 6, characterized in that: One end of the connecting pipe (803) is connected to the cooling box (8), and the other end of the connecting pipe (803) is connected to the circulating pump (801). The water inlet pipe (802) is connected to an external cooling water source.

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