Automatic demolding device for injection molded products

Abstract

The utility model relates to injection molding demoulding device technical field discloses an automatic demoulding device of injection product, including upper mould, the lower mould is provided with in the upper mould lower surface, the upper mould lower surface fixedly connected with guide rod, the inside of lower mould is established with forming groove, the inside of lower mould is provided with demoulding subassembly, the inside of lower mould is provided with cooling subassembly, the demoulding subassembly includes push rod and push board, the push rod side wall sliding connection in the inside of lower mould, the push board side wall fixedly connected on the upper surface of push rod, the push board side wall sliding connection in the inside of forming groove. In the utility model, the eccentric wheel will do eccentric circular motion with the connecting rod under the drive of motor, the connecting block swings under the drive of eccentric wheel, drives the rotating block to drive push rod to do up-and-down reciprocating motion in the inside of lower mould, with the push rod ascending, the injection product in forming groove is pushed out, and the demoulding efficiency of equipment is improved through above -mentioned structure.

Description

Technical Field

[0001] This utility model relates to the technical field of injection molding demolding devices, and in particular to an automatic demolding device for injection molded products. Background Technology

[0002] In modern manufacturing, injection molding is a key process in the production of plastic products, and its production efficiency and product quality directly affect a company's competitiveness. Automatic demolding devices for injection molded products, as a core component of the injection molding process, play a crucial role in separating the molded plastic products from the mold. With the increasing market demand for plastic products and the continuous improvement in product complexity, achieving high efficiency, stability, and automation in the demolding process has become a key technological focus for the industry.

[0003] Traditional ejection devices for injection molded products often employ a single ejection mechanism or a simple mechanical linkage structure. Common ejector-type ejection systems use hydraulic or pneumatically driven ejector pins to directly push the product out, utilizing the relative displacement between the ejector pins and the mold surface. Other systems use a slider-driven core-pulling mechanism, where a slider is first driven by a guide post or hydraulic cylinder to perform a side core-pulling action, followed by ejection by the ejector pins. The technical principles of these traditional devices primarily rely on rigid mechanical transmission, achieving demolding through a fixed stroke and thrust, lacking the ability to adaptively adjust to changes in product shape, size, and demolding resistance.

[0004] Traditional ejection devices for injection molded products suffer from problems due to their simple ejection mechanism structure and difficulty in precisely controlling the ejection path and force. This can easily lead to excessive local stress on the product, causing deformation and damage, or insufficient ejection force or unreasonable ejection position, resulting in ejection failure and product retention in the mold, thus reducing the product yield. Therefore, an automatic ejection device for injection molded products is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an automatic demolding device for injection molded products. It aims to improve the problems in the prior art where the ejection mechanism of traditional demolding devices has a simple structure and the ejection path and force are difficult to control precisely. This makes it easy for the product to be deformed or damaged due to excessive local force, or for the product to fail to demold and remain due to insufficient ejection force or unreasonable ejection position.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automatic demolding device for injection molded products includes an upper mold, a lower mold disposed on the lower surface of the upper mold, a guide rod fixedly connected to the lower surface of the upper mold, a molding groove opened inside the lower mold, a demolding component disposed inside the lower mold, and a cooling component disposed inside the lower mold.

[0008] The demolding assembly includes a push rod and a push plate. The side wall of the push rod is slidably connected to the inside of the lower mold. The side wall of the push plate is fixedly connected to the upper surface of the push rod and slidably connected to the inside of the forming groove. A motor is fixedly connected inside the lower mold. A connecting rod is fixedly connected to the output end of the motor. An eccentric wheel is fixedly connected to the side wall of the connecting rod. A connecting block is rotatably connected inside the eccentric wheel. A mounting base is fixedly connected to the bottom of the push rod. A rotating block is rotatably connected inside the mounting base. One end of the connecting block is fixedly connected to the side wall of the rotating block.

[0009] As a further description of the above technical solution:

[0010] The cooling assembly includes a cooling pipe, the sidewall of which is fixedly connected to the inside of the lower mold. The cooling pipe surrounds the outside of the forming groove, and heat dissipation fins are fixedly connected inside the lower mold.

[0011] As a further description of the above technical solution:

[0012] The guide rod sidewall is slidably connected to the inside of the lower mold, the push rod sidewall is fixedly connected to a fixing ring, the push rod sidewall is sleeved with a spring, one end of the spring is fixedly connected to the inner wall of the lower mold, and the other end of the spring is fixedly connected to the sidewall of the fixing ring.

[0013] As a further description of the above technical solution:

[0014] A water tank is fixedly connected to the side wall of the lower mold, a cooler is fixedly connected to the side wall of the lower mold, and a circulating pump is fixedly connected to the side wall of the lower mold.

[0015] As a further description of the above technical solution:

[0016] One end of the cooling pipe is fixedly connected to the inside of the cooler, and a connecting pipe is fixedly connected to the side wall of the cooler, with one end of the connecting pipe fixedly connected to the inside of the water tank.

[0017] As a further description of the above technical solution:

[0018] The input end of the circulation pump is fixedly connected inside the water tank, and the output end of the circulation pump is fixedly connected to the other end of the cooling pipe.

[0019] As a further description of the above technical solution:

[0020] The lower mold is equipped with a heat pipe, with the evaporation end of the heat pipe located at the bottom of the molding groove and the condensation end of the heat pipe located inside the heat dissipation fins.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the connecting rod is driven to rotate by a motor, and the eccentric wheel will make eccentric circular motion with the connecting rod. The connecting block will swing under the drive of the eccentric wheel, which will drive the rotating block to move, and drive the push rod to make up-and-down reciprocating motion inside the lower mold. As the push rod rises, it gradually pushes out the injection molded product located in the molding groove. This solves the problem that some automatic demolding devices for injection molded products cannot provide uniform and continuous ejection force, resulting in uneven force on the product during demolding, which greatly affects the product yield and production efficiency. The above structure improves the demolding efficiency of the equipment.

[0023] 2. In this utility model, by starting the circulation pump, the coolant in the water tank is drawn out and transported to the lower mold through the cooling pipe. The cooling pipe surrounding the molding tank exchanges heat with the mold, absorbing the heat generated during the injection molding process and cooling the mold. The coolant carrying heat flows out from the cooling pipe and enters the cooler for heat dissipation and cooling. Then it flows back to the water tank through the connecting pipe to complete the cooling cycle. In addition, the evaporation end of the heat pipe is located at the bottom of the molding tank. The working fluid in the heat pipe absorbs heat and evaporates. The vapor flows along the heat pipe to the condensation end located inside the heat dissipation fins to release heat. The heat is dissipated to the surrounding environment through the heat dissipation fins. The liquefied working fluid flows back to the evaporation end to continue to participate in the heat transfer process, further improving the cooling efficiency, shortening the cooling time of the injection molded product, and improving production efficiency. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of an automatic demolding device for injection molded products proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the upper mold of an automatic demolding device for injection molded products proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the lower mold of an automatic demolding device for injection molded products proposed in this utility model;

[0027] Figure 4 This is a schematic diagram of the demolding component of an automatic demolding device for injection molded products proposed in this utility model;

[0028] Figure 5 This is a schematic diagram of the internal structure of the lower mold of an automatic demolding device for injection molded products proposed in this utility model.

[0029] Legend:

[0030] 1. Upper mold; 2. Lower mold; 3. Guide rod; 4. Forming groove; 5. Motor; 6. Connecting rod; 7. Eccentric wheel; 8. Connecting block; 9. Rotating block; 10. Push rod; 11. Push plate; 12. Fixing ring; 13. Mounting base; 14. Spring; 15. Cooling pipe; 16. Water tank; 17. Cooler; 18. Connecting pipe; 19. Circulating pump; 20. Heat dissipation fins; 21. Heat pipe. Detailed Implementation

[0031] 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.

[0032] Reference Figures 1-4 This utility model provides an embodiment of an automatic demolding device for injection molded products, including an upper mold 1, a lower mold 2 disposed on the lower surface of the upper mold 1, a guide rod 3 fixedly connected to the lower surface of the upper mold 1, the guide rod 3 serving to guide during the mold opening and closing process, ensuring that the upper mold 1 and the lower mold 2 can be accurately aligned during mold closing and opening, a molding groove 4 is provided inside the lower mold 2, and a demolding component is provided inside the lower mold 2, the demolding component being used to push the product out of the molding groove 4 after the injection molded product is formed, realizing the automatic demolding function, reducing manual operation, improving production efficiency, and reducing labor intensity; a cooling component is provided inside the lower mold 2, the cooling component being used to cool and reduce the temperature of the lower mold 2 and the molding groove 4, accelerating the cooling and solidification speed of the injection molded product, and shortening the production cycle;

[0033] The demolding assembly includes a push rod 10 and a push plate 11. The side wall of the push rod 10 is slidably connected inside the lower mold 2. The push rod 10 is used to push the push plate 11 upward during demolding, thereby ejecting the injection molded product from the molding groove 4. The side wall of the push plate 11 is fixedly connected to the upper surface of the push rod 10. The push plate 11 is used to directly contact and push the injection molded product. Its large contact area can evenly distribute the ejection force and prevent the product from deforming or breaking due to excessive local force. The side wall of the push plate 11 is slidably connected inside the molding groove 4. A motor 5 is fixedly connected inside the lower mold 2. A connecting rod 6 is fixedly connected to the output end of the motor 5. An eccentric wheel 7 is fixedly connected to the side wall of the connecting rod 6. A connecting block 8 is rotatably connected inside the eccentric wheel 7. A mounting bracket is fixedly connected to the bottom of the push rod 10. Mounting base 13, with rotating block 9 rotatably connected inside. One end of connecting block 8 is fixedly connected to the side wall of rotating block 9. When eccentric wheel 7 rotates, connecting block 8 swings under the drive of eccentric wheel 7, thereby driving rotating block 9 to rotate, causing push rod 10 to move up and down, achieving the effect of converting the power of motor 5 into the demolding power of push rod 10. Guide rod 3 is slidably connected to the side wall of lower mold 2. A fixing ring 12 is fixedly connected to the side wall of push rod 10. Spring 14 is sleeved on the side wall of push rod 10. One end of spring 14 is fixedly connected to the inner wall of lower mold 2, and the other end of spring 14 is fixedly connected to the side wall of fixing ring 12. Spring 14 is used to absorb impact force and prevent push rod 10 from rigidly colliding with mold and product, thereby protecting mold and product.

[0034] Reference Figures 3-5The cooling assembly includes a cooling pipe 15, which is fixedly connected to the inside of the lower mold 2 and surrounds the molding groove 4. The cooling pipe 15 is used to remove the large amount of heat generated by the lower mold 2 and molding groove 4 during the injection molding process through the flow of coolant, thereby reducing the mold temperature and accelerating the cooling and solidification of the product. Heat dissipation fins 20 are fixedly connected inside the lower mold 2 to increase the heat dissipation area and accelerate the dissipation of heat to the surrounding environment. A water tank 16 is fixedly connected to the side wall of the lower mold 2 to store coolant and provide a continuous source of cooling medium for the cooling circulation system. A cooler 17 is fixedly connected to the side wall of the lower mold 2 to dissipate the high-temperature coolant flowing from the cooling pipe 15. For cooling, a circulating pump 19 is fixedly connected to the side wall of the lower mold 2. One end of the cooling pipe 15 is fixedly connected to the inside of the cooler 17. A connecting pipe 18 is fixedly connected to the side wall of the cooler 17. One end of the connecting pipe 18 is fixedly connected to the inside of the water tank 16. The input end of the circulating pump 19 is fixedly connected to the inside of the water tank 16, and the output end of the circulating pump 19 is fixedly connected to the other end of the cooling pipe 15. A heat pipe 21 is installed inside the lower mold 2. The evaporation end of the heat pipe 21 is located at the bottom of the molding tank 4, and the condensation end of the heat pipe 21 is located inside the heat dissipation fins 20. The heat pipe 21 is used to transfer the absorbed heat to the heat dissipation fins 20, which then dissipates the heat to the surrounding environment. This achieves the effect of efficiently transferring and dissipating the local high heat of the mold, reducing the temperature at the bottom of the molding tank 4, and improving the cooling uniformity.

[0035] Working principle: After injection molding is completed using this equipment, when the molded product needs to be ejected from the molding groove 4 of the lower mold 2, the motor 5 is powered on and rotates, driving the connecting rod 6 to rotate. Since the eccentric wheel 7 is fixedly connected to the side wall of the connecting rod 6, the eccentric wheel 7 will perform eccentric circular motion with the connecting rod 6. At this time, the connecting block 8 will oscillate back and forth under the drive of the eccentric wheel 7. When the rotating block 9 is driven by the connecting block 8, it will drive the push rod 10 to move up and down reciprocally inside the lower mold 2. The push plate 11 fixedly connected to the upper surface of the push rod 10 will gradually push out the injection molded product located in the molding groove 4 as the push rod 10 rises. Because the push plate 11 is slidably connected to the inside of the forming groove 4, it can ensure the smooth pushing of the product and avoid damage to the product due to uneven force. During the lifting process of the push rod 10, the spring 14 will be compressed to reduce the movement speed and impact force of the push rod 10, and avoid rigid collision between the push plate 11 and the mold and the product, effectively protecting the surface finish of the mold cavity and the integrity of the product. Before demolding, the circulation pump 19 is started to draw coolant from the water tank 16. The coolant enters the cooling pipe 15 through the output end of the circulation pump 19. The cooling pipe 15 surrounds the outside of the forming groove 4 and can fully exchange heat with the lower mold 2. During the heat exchange process, the coolant absorbs the heat generated by the lower mold 2 and the molding tank 4 during injection molding, causing its own temperature to rise. The coolant carrying heat flows out from one end of the cooling pipe 15 and enters the cooler 17. In the cooler 17, the coolant dissipates heat through heat dissipation and other methods, lowering its temperature. The cooled coolant then flows back to the water tank 16 through the connecting pipe 18, completing one coolant cycle and achieving continuous cooling of the lower mold 2 and the molding tank 4. At the same time, the heat pipe 21 installed inside the lower mold 2 has its evaporation end located at the bottom of the molding tank 4. During the injection molding process, the temperature at the bottom of the molding tank 4 is relatively low. The working fluid inside the evaporation end of the heat pipe 21 absorbs heat and quickly evaporates into steam. Due to the low density and fluidity of steam, it flows along the heat pipe 21 towards the condensation end located inside the heat dissipation fins 20. When the steam reaches the condensation end, it encounters the relatively cool heat dissipation fins 20, and the steam liquefies upon cooling, releasing a large amount of heat. This heat is dissipated into the surrounding environment through the heat dissipation fins 20, achieving rapid heat transfer. The liquefied working fluid flows back to the evaporation end under the action of gravity or other forces, continuing to absorb heat from the bottom of the molding tank 4, forming a continuous heat transfer cycle.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic demolding device for injection molded products, comprising an upper mold (1), characterized in that: The lower surface of the upper mold (1) is provided with a lower mold (2), a guide rod (3) is fixedly connected to the lower surface of the upper mold (1), a forming groove (4) is opened inside the lower mold (2), a demolding component is provided inside the lower mold (2), and a cooling component is provided inside the lower mold (2). The demolding assembly includes a push rod (10) and a push plate (11). The side wall of the push rod (10) is slidably connected to the inside of the lower mold (2). The side wall of the push plate (11) is fixedly connected to the upper surface of the push rod (10). The side wall of the push plate (11) is slidably connected to the inside of the forming groove (4). A motor (5) is fixedly connected inside the lower mold (2). A connecting rod (6) is fixedly connected to the output end of the motor (5). An eccentric wheel (7) is fixedly connected to the side wall of the connecting rod (6). A connecting block (8) is rotatably connected inside the eccentric wheel (7). A mounting base (13) is fixedly connected to the bottom of the push rod (10). A rotating block (9) is rotatably connected inside the mounting base (13). One end of the connecting block (8) is fixedly connected to the side wall of the rotating block (9).

2. The automatic demolding device for injection molded products according to claim 1, characterized in that: The cooling assembly includes a cooling pipe (15), the sidewall of which is fixedly connected to the inside of the lower mold (2), the cooling pipe (15) surrounds the periphery of the forming groove (4), and heat dissipation fins (20) are fixedly connected inside the lower mold (2).

3. The automatic demolding device for injection molded products according to claim 1, characterized in that: The guide rod (3) is slidably connected to the inside of the lower mold (2) on its side wall. The push rod (10) is fixedly connected to a fixing ring (12) on its side wall. A spring (14) is sleeved on the side wall of the push rod (10). One end of the spring (14) is fixedly connected to the inner wall of the lower mold (2), and the other end of the spring (14) is fixedly connected to the side wall of the fixing ring (12).

4. The automatic demolding device for injection molded products according to claim 2, characterized in that: A water tank (16) is fixedly connected to the side wall of the lower mold (2), a cooler (17) is fixedly connected to the side wall of the lower mold (2), and a circulating pump (19) is fixedly connected to the side wall of the lower mold (2).

5. An automatic demolding device for injection molded products according to claim 4, characterized in that: One end of the cooling pipe (15) is fixedly connected to the inside of the cooler (17), and a connecting pipe (18) is fixedly connected to the side wall of the cooler (17). One end of the connecting pipe (18) is fixedly connected to the inside of the water tank (16).

6. An automatic demolding device for injection molded products according to claim 5, characterized in that: The input end of the circulating pump (19) is fixedly connected inside the water tank (16), and the output end of the circulating pump (19) is fixedly connected to the other end of the cooling pipe (15).

7. An automatic demolding device for injection molded products according to claim 6, characterized in that: The lower mold (2) is provided with a heat pipe (21), the evaporation end of the heat pipe (21) is located at the bottom of the molding groove (4), and the condensation end of the heat pipe (21) is located inside the heat dissipation fins (20).

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