A mold structure for easy demolding of automotive injection molded parts

Abstract

This utility model relates to the field of injection mold technology and discloses a mold structure for easy demolding of automotive injection molded parts. It includes a moving mold and a fixed mold. Two first hydraulic cylinders are fixedly installed on the top of the fixed mold. The moving mold has an inner cavity, and two second hydraulic cylinders are fixedly installed on the inner wall of the inner cavity. The fixed mold has an inner cavity, and a refrigerant coil is fixedly installed on the inner wall of the inner cavity. An air tank is fixedly installed in the inner cavity of the moving mold. This mold operates efficiently through dual drive and multi-system coordination. The first hydraulic cylinders drive the moving mold to open and close, and the second hydraulic cylinders push the ejector pins through the moving mold. Simultaneously, the air tank ejects air through the air jet nozzle to form a dual demolding process, solving the problems of residue and poor flow in traditional molds. The refrigerant coil in the inner cavity of the fixed mold, along with the circulating pump and refrigeration box, forms a closed loop, achieving uniform cooling of the mold cavity, overcoming deformation and long cycle times, adapting to automated production lines, and enhancing stability and economy.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a mold structure that facilitates demolding of automotive injection molded parts. Background Technology

[0002] Automotive injection molds are core equipment in the production of automotive plastic parts. Their performance directly affects product quality and production efficiency. Traditional mold mechanisms have many limitations. The demolding process relies on a single ejector pin or manual assistance, lacking a linked demolding design. Insufficient demolding force often results in molded parts remaining in the mold cavity, and may even cause surface scratches and component deformation, seriously affecting production continuity. Furthermore, they generally lack dedicated cooling equipment, relying mostly on natural cooling or simple piped water cooling, which cannot form a stable refrigerant circulation. This leads to uneven heat dissipation in the mold cavity, inconsistent cooling rates of the injection molded parts, and a tendency for shrinkage deformation and surface defects. The long cooling time also significantly restricts production cycle. The lack of precise limiting structures for mold opening and closing positioning results in uneven mold closing clearance, causing problems such as dimensional deviations and flash in the injection molded parts, making it difficult to meet the high-efficiency and high-precision production requirements of the modern automotive manufacturing industry.

[0003] Therefore, those skilled in the art have provided a mold structure that facilitates the demolding of automotive injection molded parts to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies. This mold structure, which facilitates demolding of automotive injection molded parts, uses a first hydraulic cylinder to drive a connecting rod, causing the moving mold to open and close. A second hydraulic cylinder then pushes an ejector pin fixing plate, allowing the ejector pin to pass through the moving mold surface. Simultaneously, air is ejected from the gas tank through a gas pipe and air jet, achieving a dual demolding linkage of ejection and air jetting. After the injection molded part is formed, the ejector pin push and air jetting act synchronously, overcoming the problems of injection molded part residue and uneven demolding caused by a single demolding method in traditional demolding structures. This significantly improves demolding efficiency and the integrity of the injection molded part. The refrigerant coil in the fixed mold cavity forms a closed-loop refrigerant circulation system with the refrigeration box via a circulating pump. The refrigerant flows through the refrigerant delivery pipe into the coil... The continuous internal flow ensures uniform and efficient cooling of the mold cavity, solving the problems of uneven cooling in traditional methods that lead to injection molded part deformation and long molding cycles. This improves the molding quality and production efficiency of injection molded parts. The limiting rods at the four corners of the fixed mold pass through the inner cavity of the moving mold, and work with the limiting plate to precisely limit the opening and closing position of the moving mold. The transmission cooperation between the first hydraulic cylinder and the connecting rod ensures precise fitting between the moving mold and the fixed mold, avoiding the dimensional errors of injection molded parts caused by the opening and closing positioning deviation of traditional molds. This improves the mold closing accuracy and product consistency. The linkage control between the circulating pump and the refrigeration box ensures continuous circulation of the refrigerant. The overall mold structure is adapted to the needs of automated production lines for automotive injection molded parts for efficient demolding and precise molding, improving the stability and economy of mass production.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A mold structure for easy demolding of automotive injection molded parts includes a moving mold and a fixed mold. Two first hydraulic cylinders are fixedly mounted on the top of the fixed mold, and connecting rods are fixedly connected to the output ends of both first hydraulic cylinders. An inner cavity is formed inside the moving mold, and two second hydraulic cylinders are fixedly mounted on the inner wall of the inner cavity. Fixed plate push rods are fixedly connected to the output ends of both second hydraulic cylinders. Ejector pin fixing plates are fixedly connected to the two fixed plate push rods. Ejector pins are fixedly mounted on the ejector pin fixing plates. Through holes for the ejector pins to pass through are correspondingly formed on the surface of the moving mold. An inner cavity is formed inside the fixed mold, and a refrigerant coil is fixedly installed on the inner wall of the inner cavity. A refrigeration box is fixedly connected to the outlet end of the refrigerant coil. A circulating pump is fixedly connected to the top of the refrigeration box, and the inlet end of the circulating pump extends into the refrigeration box. A refrigerant delivery pipe is fixedly connected to the outlet end of the circulating pump, and the refrigerant delivery pipe is fixedly connected to the inlet end of the refrigerant coil at its furthest point. A gas tank is fixedly mounted inside the inner cavity of the moving mold, and an injection channel is formed on the surface of the moving mold, extending into the inner cavity of the moving mold. Through the above technical solution, the two first hydraulic cylinders at the top of the fixed mold and the connecting rod form a driving linkage to provide stable power for the opening and closing of the moving mold. The two second hydraulic cylinders in the inner cavity of the moving mold drive the ejector pin fixing plate through the fixed plate push rod, so that the ejector pin pushes stably along the through hole of the moving mold. Together with the air tank in the inner cavity of the moving mold, a dual demolding structure of pushing and air jetting is formed to ensure smooth demolding of the injection molded parts. The refrigerant coil, refrigeration box and circulation pump in the inner cavity of the fixed mold form a closed loop through the refrigerant delivery pipe to realize the continuous circulation of refrigerant and provide a uniform cooling environment for the mold cavity. The injection channel on the surface of the moving mold extends precisely to the inner cavity to ensure stable injection of raw materials. This structure solves the problems of poor demolding and uneven cooling in traditional methods, improves demolding efficiency and molding quality, and ensures stable and efficient production.

[0006] Furthermore, a mold cavity is formed between the moving mold and the fixed mold; Through the above technical solution, the precise fit between the moving mold and the fixed mold provides the molding space for the injection molded part to match the design size. After the raw material is injected through the injection channel, it is cooled and solidified in the mold cavity.

[0007] Furthermore, the gas tank is connected to two air nozzles via a gas supply pipe, and both air nozzles are located on the mating surfaces of the moving mold and the fixed mold. Through the above technical solution, the high-pressure gas stored in the gas tank is accurately delivered to the two jet nozzles through the gas delivery pipe. The opening position of the contact surface allows the gas to act directly on the contact gap between the injection molded part and the mold. The symmetrical distribution of the two jet nozzles ensures that the gas spray evenly covers the edge area of ​​the injection molded part, which can quickly separate the injection molded part from the cavity wall, reduce demolding resistance, and form a three-dimensional synergy with the pushing action of the ejector pin.

[0008] Furthermore, the ends of both connecting rods are fixedly connected to rod fixing seats, and the rod fixing seats are fixedly disposed on the top of the moving mold; Through the above technical solution, the tie rod fixing seat uses a double fixed connection structure to evenly transmit the driving force of the two connecting tie rods to the top of the moving mold, avoiding the tilting of the moving mold caused by the force concentration on a single tie rod or loose connection, ensuring the linear accuracy of the moving mold when the first hydraulic cylinder drives the moving mold to open and close, and enhancing the rigid connection strength between the connecting tie rod and the moving mold.

[0009] Furthermore, limit rods are fixedly provided at the four corners of the fixed mold, and the four limit rods pass through the inner cavity of the moving mold. The ends of the four limit rods are fixedly connected to limit plates. Through the above technical solution, four limiting rods are evenly inserted into the inner cavity of the moving mold from the four corners of the fixed mold, forming a precise guiding structure for the opening and closing of the moving mold. The limiting plate limits the maximum opening and closing stroke of the moving mold through the end limit, avoiding excessive movement or deviation of the moving mold, and ensuring that the moving mold moves stably along the axis of the limiting rods.

[0010] This utility model has the following beneficial effects: This utility model proposes a mold structure that facilitates the demolding of automotive injection molded parts. Through the dual demolding linkage of push-pull and air jet, it effectively solves the problems of injection molded part residue and poor demolding caused by traditional single demolding methods, significantly improving demolding efficiency and product integrity. With the help of a closed-loop refrigerant circulation system, it overcomes the problems of injection molded part deformation and long molding cycle caused by uneven cooling in traditional methods, improving molding quality and production efficiency. Through the limiting structure and transmission cooperation, it avoids dimensional errors caused by traditional positioning deviations, improves mold closing accuracy and product consistency, and is fully compatible with the needs of automated production lines, reducing production failures and enhancing the stability and economy of mass production. Attached Figure Description

[0011] Figure 1 This is a side sectional view of a mold structure for facilitating demolding of automotive injection molded parts proposed in this utility model; Figure 2 This is a sectional view of the mold structure for facilitating demolding of automotive injection molded parts proposed in this utility model after the mold is fixed. Figure 3 This is a rear sectional view of the moving mold of a mold structure that facilitates demolding of automotive injection molded parts, as proposed in this utility model. Figure 4 This is a schematic diagram of the mold opening process for a mold structure that facilitates demolding of automotive injection molded parts, as proposed in this utility model. Figure 5 This is a schematic diagram of the mold closing mechanism for a mold structure that facilitates demolding of automotive injection molded parts, as proposed in this utility model. Explanation of reference numerals in the attached figures: 1. Moving mold; 2. Mold cavity; 3. Fixed mold; 4. First hydraulic cylinder; 5. Connecting tie rod; 6. Tie rod fixing seat; 7. Injection channel; 8. Ejector pin fixing plate; 9. Second hydraulic cylinder; 10. Limiting plate; 11. Air tank; 12. Air supply pipe; 13. Moving mold inner cavity; 14. Refrigerant coil; 15. Circulating pump; 16. Refrigeration box; 17. Refrigerant supply pipe; 18. Fixed mold inner cavity; 19. Limiting rod; 20. Air nozzle; 21. Ejector pin; 22. Fixing plate push rod. Detailed Implementation

[0012] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Reference Figure 1 , Figure 4 , Figure 5 This utility model provides a specific implementation method: A mold structure for easy demolding of automotive injection molded parts includes a moving mold 1 and a fixed mold 3. Two first hydraulic cylinders 4 are fixedly mounted on the top of the fixed mold 3, and the output ends of the two first hydraulic cylinders 4 are fixedly connected to connecting rods 5. The moving mold 1 has a moving mold cavity 13, and two second hydraulic cylinders 9 are fixedly mounted on the inner wall of the moving mold cavity 13. The output ends of the two second hydraulic cylinders 9 are fixedly connected to fixed plate push rods 22, and the two fixed plate push rods 22 are fixedly connected to ejector pin fixing plates 8. Ejector pins 21 are fixedly mounted on the ejector pin fixing plates 8. The surface of the moving mold 1 has corresponding through holes for the ejector pins 21 to pass through. The fixed mold 3 has a fixed mold cavity 18, and a refrigerant coil 14 is fixedly installed on the inner wall of the fixed mold cavity 18. The outlet end of the refrigerant coil 14 is fixedly connected to a refrigeration box 16. A circulation pump 15 is fixedly connected to the top of the refrigeration box 16. The inlet end of the circulation pump 15 extends into the refrigeration box 16, and the outlet end of the circulation pump 15 is fixedly connected to a refrigerant delivery pipe 17. The end of the refrigerant delivery pipe 17 away from the refrigerant coil is fixedly connected to a refrigerant coil. At the inlet end of pipe 14, an air tank 11 is fixedly installed inside the moving mold cavity 13. An injection channel 7 is opened on the surface of the moving mold 1, extending into the moving mold cavity 13. Two first hydraulic cylinders 4 on the top of the fixed mold 3 and the connecting rod 5 form a driving linkage to provide stable power for the opening and closing of the moving mold 1. Two second hydraulic cylinders 9 in the moving mold cavity 13 drive the ejector pin fixing plate 8 through the fixed plate push rod 22, so that the ejector pin 21 pushes stably along the through hole of the moving mold 1. Together with the air tank 11 in the moving mold cavity 13, a dual demolding structure of pushing and air jetting is formed to ensure smooth demolding of the injection molded parts. The refrigerant coil 14, the refrigeration box 16 and the circulating pump 15 in the fixed mold cavity 18 form a closed loop through the refrigerant delivery pipe 17 to realize the continuous circulation of refrigerant and provide a uniform cooling environment for the mold cavity 2. The injection channel 7 on the surface of the moving mold 1 extends precisely into the cavity to ensure stable injection of raw materials. This structure solves the problems of poor demolding and uneven cooling in traditional methods, improves demolding efficiency and molding quality, and ensures stable and efficient production.

[0014] Reference Figure 1 , Figure 2 , Figure 3 This utility model provides another specific embodiment: A mold cavity 2 is formed between the moving mold 1 and the fixed mold 3. Through the precise fitting of the moving mold 1 and the fixed mold 3, the mold cavity 2 provides a molding space matching the design dimensions of the injection molded part. After the raw material is injected through the injection channel 7, it cools and solidifies in the mold cavity 2. The gas tank 11 is connected to two air jets 20 through the air supply pipe 12. Both air jets 20 are opened on the mating surface of the moving mold 1 and the fixed mold 3. The high-pressure gas stored in the gas tank 11 is precisely delivered to the two air jets 20 through the air supply pipe 12. The opening position on the mating surface allows the gas to directly act on the contact gap between the injection molded part and the mold. The symmetrical distribution of the two air jets 20 ensures that the air jet evenly covers the edge area of ​​the injection molded part, which can quickly separate the injection molded part from the cavity wall, reduce demolding resistance, and form a three-dimensional synergy with the pushing action of the ejector pin 21. The ends of the two connecting rods 5 are fixedly connected to the rod fixing seat 6. The fixed seat 6 is fixedly set on the top of the moving mold 1. The tie rod fixing seat 6 transmits the driving force of the two connecting tie rods 5 evenly to the top of the moving mold 1 through the double fixed connection structure, avoiding the tilting of the moving mold 1 caused by the force concentration of a single tie rod or the loose connection, ensuring the linear accuracy of the first hydraulic cylinder 4 when driving the moving mold 1 to open and close, and enhancing the rigid connection strength between the connecting tie rod 5 and the moving mold 1. Limit rods 19 are fixedly set at the four corners of the fixed mold 3. The four limit rods 19 are all inserted into the inner cavity 13 of the moving mold. The ends of the four limit rods 19 are fixedly connected to the limit plates 10. The four limit rods 19 are evenly inserted into the inner cavity 13 of the moving mold from the four corners of the fixed mold 3, forming a precise guide structure for the opening and closing of the moving mold 1. The limit plates 10 limit the maximum opening and closing stroke of the moving mold 1 by limiting the end, avoiding excessive movement or deviation of the moving mold 1, and ensuring that the moving mold 1 moves stably along the axis of the limit rods 19.

[0015] Working principle: When the mold starts the mold closing program, the first hydraulic cylinder 4 drives the connecting rod 5 to pull the rod fixing seat 6, causing the moving mold 1 to move towards the fixed mold 3. During the movement of the moving mold 1, the limit rod 19 slides inward synchronously along the inner cavity 13 of the moving mold until the moving mold 1 and the fixed mold 3 are in contact. At this time, the moving mold 1 and the fixed mold 3 are precisely closed to form the mold cavity 2. Then, the molten raw material is injected into the mold cavity 2 through the injection channel 7. At the same time, the circulation pump 15 starts, drawing refrigerant from the refrigeration box 16 and sending it into the refrigerant coil 14 through the refrigerant delivery pipe 17. After the refrigerant absorbs heat in the refrigerant coil 14, it flows back to the refrigeration box 16, forming a closed loop circulation, which circulates the raw material in the mold cavity 2. After continuous cooling and molding of the injection molded part, the demolding process is initiated. The gas tank 11 delivers high-pressure gas to the air jet 20 through the air supply pipe 12. The air jet 20 sprays gas into the gap between the mold cavity 2 and the injection molded part, initially separating the injection molded part. At the same time, the second hydraulic cylinder 9 drives the fixed plate push rod 22 to extend forward, pushing the ejector pin fixed plate 8 to move, so that the ejector pin 21 passes through the through hole on the surface of the moving mold 1 and pushes the injection molded part. Finally, the first hydraulic cylinder 4 drives the connecting rod 5 in the opposite direction to push the moving mold 1 away from the fixed mold 3 along the limit rod 19. The ejector pin 21 continues to push and cooperates with the air jet 20 to continuously spray gas, finally completely separating the injection molded part from the mold cavity 2, completing the demolding process.

[0016] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0017] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0018] 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 specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific 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. A mold structure for facilitating demolding of automotive injection molded parts, comprising a moving mold (1) and a fixed mold (3), characterized in that: Two first hydraulic cylinders (4) are fixedly installed on the top of the fixed mold (3). The output ends of the two first hydraulic cylinders (4) are fixedly connected to connecting rods (5). The moving mold (1) has a moving mold cavity (13) inside. Two second hydraulic cylinders (9) are fixedly installed on the inner wall of the moving mold cavity (13). The output ends of the two second hydraulic cylinders (9) are fixedly connected to fixed plate push rods (22). The two fixed plate push rods (22) are fixedly connected to ejector pin fixing plates (8). Ejector pins (21) are fixedly installed on the ejector pin fixing plates (8). The surface of the moving mold (1) has corresponding through holes for the ejector pins (21) to pass through. The fixed mold (3) has a fixed mold cavity inside. (18) A refrigerant coil (14) is fixedly installed on the inner wall of the fixed mold cavity (18). The outlet end of the refrigerant coil (14) is fixedly connected to the refrigeration box (16). A circulation pump (15) is fixedly connected to the top of the refrigeration box (16). The inlet end of the circulation pump (15) extends into the refrigeration box (16). The outlet end of the circulation pump (15) is fixedly connected to the refrigerant delivery pipe (17). The end of the refrigerant delivery pipe (17) away from the inlet end of the refrigerant coil (14) is fixedly connected. A gas tank (11) is fixedly installed in the moving mold cavity (13). An injection channel (7) is opened on the surface of the moving mold (1). The injection channel (7) extends into the moving mold cavity (13).

2. The mold structure for facilitating demolding of automotive injection molded parts according to claim 1, characterized in that: A mold cavity (2) is formed between the moving mold (1) and the fixed mold (3).

3. The mold structure for facilitating demolding of automotive injection molded parts according to claim 1, characterized in that: The gas tank (11) is connected to two gas nozzles (20) through a gas supply pipe (12), and both gas nozzles (20) are located on the mating surfaces of the moving mold (1) and the fixed mold (3).

4. The mold structure for facilitating demolding of automotive injection molded parts according to claim 1, characterized in that: The ends of both connecting rods (5) are fixedly connected to rod fixing seats (6), which are fixedly installed on the top of the moving mold (1).

5. The mold structure for facilitating demolding of automotive injection molded parts according to claim 1, characterized in that: The fixed mold (3) is fixedly provided with limit rods (19) at all four corners. The four limit rods (19) are all inserted into the inner cavity (13) of the moving mold. The ends of the four limit rods (19) are fixedly connected to the limit plate (10).

Images