Anti-overflow injection mold for automobile steering wheel trim

Abstract

The utility model relates to the technical field of automobile accessory production, disclose a spill -proof material's car steering wheel decoration piece injection mold, including base and top table, the bottom of base is provided with negative pressure mechanism, the negative pressure mechanism is used for before injection to exhaust air and make the mould airtight negative pressure, the adjacent between base and top table is provided with mould mechanism, the mould mechanism is used for mould injection to form assembly spare, the top of top table is provided with material delivery mechanism, the negative pressure mechanism includes box cover, the top fixed connection in the bottom of base of box cover, the bottom fixed connection of box cover has the protection box. In the utility model, through the action of push rod subassembly in protection box, the connecting port of base makes inner air pipe and protection box intercommunication, air exhausts through the air outlet, and the fixed base and protection box of box cover ensure that the precision part is protected, realize airtight negative pressure before mould injection, effectively prevent the material overflow, guarantee car steering wheel decoration piece injection molding quality.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing technology, and in particular to an injection mold for preventing spillage of automotive steering wheel trim parts. Background Technology

[0002] Injection molding of automotive steering wheel trim parts is a core process in the production of automotive interior parts. Using injection molding equipment, molten plastic raw materials are injected into a customized mold cavity, and after cooling and solidification, they are formed into decorative parts on the surface of the steering wheel. The process requires precise control of injection temperature, pressure, and holding time to ensure high dimensional accuracy, flawless surface, and compatibility with the curvature of the steering wheel and the assembly clip structure. It combines aesthetics and assembly functionality and is a key link in enhancing the refinement of automotive interiors.

[0003] Injection molds for automotive steering wheel trim parts can precisely replicate the curved surfaces, snap-fit ​​structures, and subtle textures of the trim parts, ensuring minimal dimensional errors and a high degree of fit with the steering wheel body. This meets the precision requirements of automotive interiors. They often employ multi-cavity designs, with mold cavities made of high-quality mold steel that has undergone heat treatment for enhanced surface hardness and wear resistance. These molds can withstand tens of thousands of injection cycles without easily wearing down or deforming, extending their service life. Furthermore, they can accommodate pre-processed structures for subsequent surface treatments, based on the trim material and design requirements, to meet diverse decorative effect needs.

[0004] Existing injection molds for automotive steering wheel trim parts are prone to problems during injection molding due to poor air venting. The mold cavity and runner design are not adequately adapted to the complex structure of the trim parts. During injection, the molten material rapidly fills the cavity, making it difficult for internal air to escape in time. Furthermore, when air venting and material injection occur simultaneously, the airflow hinders the uniform filling of the material, resulting in the mold parting surfaces not fitting tightly. The gaps caused by the molten material overflowing from the mold form flash and burrs, reducing production efficiency, clogging the mold vents and runners, affecting the molding quality, and leading to defects such as material shortages and air bubbles in the trim parts, making it difficult to meet the precision requirements of automotive interiors. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an injection mold for preventing overflow of automotive steering wheel trim parts. It aims to improve the problem in the prior art where air is trapped inside the mold during injection, and the air is discharged at the same time as the injection, which causes the mold to not fit tightly and results in overflow.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an injection mold for preventing spillage of automotive steering wheel trim, comprising a base and a top platform, wherein a negative pressure mechanism is provided at the bottom of the base, the negative pressure mechanism is used to discharge air before injection molding to seal the mold under negative pressure, a mold mechanism is provided between the adjacent base and the top platform, the mold mechanism is used for injection molding to form the assembly, and a material conveying mechanism is provided at the top of the top platform; The negative pressure mechanism includes a cover, the top of which is fixedly connected to the bottom of the base, a protective box fixedly connected to the bottom of the cover, an inner air pipe fixedly connected to the inner wall of the base, an exhaust port on the front side of the outer wall of the protective box, a push rod assembly at the bottom of the inner wall of the protective box, an exhaust assembly on the front side of the inner wall of the protective box, and a connection port on the front side of the outer wall of the base, the rear side of which communicates with the front side of the inner air pipe.

[0007] As a further description of the above technical solution: The mold mechanism includes a mold 1, the top of which is located at the bottom of the inner wall of the top platform. A mold 2 is located at the top of the inner wall of the base. A sealing ring 1 is fixedly connected to the bottom of the outer wall of the mold 1. A sealing ring 2 is fixedly connected to the top of the outer wall of the mold 2. A connecting component is provided on the adjacent side of the mold 1 and the mold 2. A lifting component is provided on the top outer wall of the top platform.

[0008] As a further description of the above technical solution: The material conveying mechanism includes a feeding pipe, the bottom of which is fixedly connected to the top of the top platform. A connecting plate is fixedly connected to the top of the feeding pipe. Multiple screws are threadedly connected to the top of the outer wall of the connecting plate. Multiple injection molding tubes are fixedly connected to the top of the inner wall of the top platform.

[0009] As a further description of the above technical solution: The push rod assembly includes multiple pneumatic connecting rods, the bottom of which is fixedly connected to the bottom of the inner wall of the same protective box, and the top of which is fixedly connected to a sliding rod. Multiple inner tubes are fixedly connected to the inner wall of the base, and adjacent sides of the multiple inner tubes are connected to the left and right sides of the same inner air pipe.

[0010] As a further description of the above technical solution: The exhaust assembly includes an air pump, the bottom of which is fixedly connected to the front of the interior of the protective box. The rear of the air pump is connected to an intake hose, the top of which is connected to the front of the bottom of the inner air pipe. The front of the air pump is connected to an exhaust hose, the front of which is connected to the rear of the exhaust port.

[0011] As a further description of the above technical solution: The negative pressure mechanism also includes a pressure gauge, the rear of which is located on the front of the base, and the bottom rear of the pressure gauge is connected to the front of the connection port.

[0012] As a further description of the above technical solution: The connecting assembly includes multiple screws, with the opposite sides of the screws threadedly connected to adjacent sides of the base and the top platform. Multiple screw holes are provided on adjacent sides of both mold one and mold two, and the outer walls of the screws are threadedly connected to the inner walls of the screw holes.

[0013] As a further description of the above technical solution: The lifting assembly includes multiple support blocks, with adjacent sides of the multiple support blocks fixedly connected to the top outer wall of the same top platform. The bottom sides of the multiple support blocks are fixedly connected to pneumatic connecting rods, and the bottoms of the multiple pneumatic connecting rods are fixedly connected to the top left and right sides of the same box cover.

[0014] This utility model has the following beneficial effects: 1. In this utility model, the push rod assembly inside the protective box is activated to drive the exhaust assembly. The connection port of the base connects the internal air pipe to the protective box, and the air is discharged through the exhaust port. The box cover fixes the base and the protective box to ensure that the precision parts are protected. This achieves a sealed negative pressure before mold injection, effectively prevents overflow, and ensures the injection molding quality of the automotive steering wheel decorative parts.

[0015] 2. In this utility model, the lifting component drives the top platform to move, causing the mold at the bottom of the inner wall of the top platform to move downward and align with the mold at the top of the inner wall of the base. The connecting component assists in the stable connection between the two. The sealing ring 1 and sealing ring 2 fit together to achieve smooth mold opening and closing and tight sealing, avoiding injection overflow and ensuring the molding accuracy of the automotive steering wheel decorative parts. Attached Figure Description

[0016] Figure 1 A perspective view of the injection mold for the anti-overflow automotive steering wheel trim part proposed in this utility model; Figure 2 This is a front view of the injection mold for the anti-overflow automotive steering wheel trim part proposed in this utility model; Figure 3 This is an exploded view of the negative pressure mechanism of the injection mold for the anti-overflow automotive steering wheel trim part proposed in this utility model; Figure 4 This is a cross-sectional view of the negative pressure mechanism of the injection mold for the anti-overflow automotive steering wheel trim part proposed in this utility model. Figure 5 This is an exploded view of the mold mechanism of the injection mold for the anti-overflow automotive steering wheel decorative part proposed in this utility model.

[0017] Legend: 1. Base; 2. Top platform; 3. Negative pressure mechanism; 31. Box cover; 32. Protective box; 33. Inner air pipe; 34. Exhaust port; 35. Push rod assembly; 351. Pneumatic connecting rod one; 352. Slide rod; 353. Inner through pipe; 36. Exhaust assembly; 361. Suction hose; 362. Air pump; 363. Exhaust hose; 37. Connection port; 38. Pressure gauge; 4. Mold mechanism; 41. Mold one; 42. Mold two; 43. Sealing ring one; 44. Sealing ring two; 45. Connecting assembly; 451. Screw one; 452. Screw hole; 46. Lifting assembly; 461. Support block; 462. Pneumatic connecting rod two; 5. Material conveying mechanism; 51. Feeding pipe; 52. Connecting plate; 53. Screw two; 54. Injection pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0019] Reference Figures 2-4 An embodiment of this utility model is provided: an injection mold for an anti-overflow automotive steering wheel trim, including a base 1 and a top platform 2. A negative pressure mechanism 3 is provided at the bottom of the base 1. The negative pressure mechanism 3 is used to discharge air before injection molding to make the mold sealed with negative pressure. A mold mechanism 4 is provided between the adjacent base 1 and the top platform 2. The mold mechanism 4 is used for mold injection molding to form the assembly. A material conveying mechanism 5 is provided at the top of the top platform 2. The negative pressure mechanism 3 includes a cover 31, the top of which is fixedly connected to the bottom of the base 1, a protective box 32 fixedly connected to the bottom of the cover 31, an inner air pipe 33 fixedly connected to the inner wall of the base 1, an exhaust port 34 opened on the front side of the outer wall of the protective box 32, a push rod assembly 35 provided at the bottom of the inner wall of the protective box 32, an exhaust assembly 36 provided on the front side of the inner wall of the protective box 32, and a connection port 37 opened on the front side of the outer wall of the base 1, with the rear side of the connection port 37 communicating with the front side of the inner air pipe 33. Specifically, the base 1 and the top platform 2 are first tightly fitted together. Then, the negative pressure mechanism 3 is activated to expel air from the mold, maintaining a sealed negative pressure state inside the mold mechanism 4. The top of the cover 31 in the negative pressure mechanism 3 is fixedly connected to the bottom of the base 1, providing an installation base for other components of the negative pressure mechanism 3. The protective box 32 is fixedly connected to the bottom of the cover 31, providing protection for the internal components. The inner air pipe 33, fixedly connected to the inner wall of the base 1, is used for air circulation. After the exhaust assembly 36 operates and expels the air from the mold mechanism 4, the push rod assembly 35 at the bottom of the inner wall of the protective box 32 begins to move. The push rod assembly 35 rises to close the inner air pipe 33, maintaining a negative pressure state inside the mold mechanism 4. Through the cooperation of the push rod assembly 35 and the exhaust assembly 36, the air inside the mold enters the protective box 32 sequentially through the inner air pipe 33 and the connection port 37 opened on the front side of the outer wall of the base 1. The air is then discharged from the exhaust port 34 on the front side of the outer wall of the protective box 32, realizing the function of venting the air inside the mold mechanism 4 and forming a closed negative pressure. This avoids overflow and injection blockage caused by air in the subsequent injection process. When the mold mechanism 4 reaches the set closed negative pressure state, the material conveying mechanism 5 on the top of the top platform 2 starts to work. The material conveying mechanism 5 delivers the injection molding material to the mold mechanism 4 set between the base 1 and the top platform 2. The mold mechanism 4 shapes the injection molding material. Through the synergistic action of the material conveying mechanism 5 and the mold mechanism 4, the injection molding effect of the car steering wheel trim is achieved. After the injection molding is completed, the negative pressure mechanism 3 stops working after the product cools and solidifies, the exhaust component 36 resets, the mold mechanism 4 opens, and the push rod component 35 continues to rise to push out the product. The operator can then take out the molded car steering wheel trim.

[0020] Reference Figures 4-5 The mold mechanism 4 includes a first mold 41, the top of which is located at the bottom of the inner wall of the top platform 2. A second mold 42 is located at the top of the inner wall of the base 1. A first sealing ring 43 is fixedly connected to the bottom of the outer wall of the first mold 41. A second sealing ring 44 is fixedly connected to the top of the outer wall of the second mold 42. A connecting component 45 is provided on the adjacent side of the first mold 41 and the second mold 42. A lifting component 46 is provided on the top outer wall of the top platform 2. Specifically, when the mold mechanism 4 is activated for molding, the lifting component 46 enters the working state. Through the transmission cooperation between the lifting component 46 and the top platform 2, the mold 1 41 located at the bottom of the inner wall of the top platform 2 is moved towards the mold 2 42 located near the top of the inner wall of the base 1. As the mold 1 41 moves, the sealing ring 1 43 fixedly connected to the bottom of the outer wall of the mold 1 41 moves synchronously. When the mold 1 41 and the mold 2 42 gradually approach the preset position, the sealing ring 1 43 and the sealing ring 2 44 fixedly connected to the top of the outer wall of the mold 2 42 come into contact with each other. Through the contact of the sealing ring 1 43 and the sealing ring 2 44, the sealing effect between the mold 1 41 and the mold 2 42 is achieved. After the mold 1 41 and the mold 2 42 are sealed and fixed, the product injection molding work can be carried out. After the injection and pressing molding operations are completed, the lifting component 46 reverses its movement. Through the reverse transmission between the lifting component 46 and the top platform 2, the mold 1 41 moves away from the mold 2 42 until the mold 1 41 returns to its initial setting position. Through the reverse movement of the lifting component 46 and the transmission of the top platform 2, the separation effect of the mold 1 41 and the mold 2 42 is achieved. At this time, the molded product can be taken out, and the mold mechanism 4 completes a complete operation process. The connecting component 45 in the mold mechanism 4 can tightly fix the mold 1 41 and the mold 2 42 in the base 1 and the top platform 2 respectively. When it is necessary to replace the mold, the connecting component 45 can easily release the locking connection state of the mold 1 41 and the mold 2 42, and re-fix it after the replacement is completed.

[0021] Reference Figures 1-3 The material conveying mechanism 5 includes a feeding pipe 51, the bottom of which is fixedly connected to the top of the top platform 2. A connecting plate 52 is fixedly connected to the top of the feeding pipe 51. Multiple screws 53 are threadedly connected to the top of the outer wall of the connecting plate 52. Multiple injection molding tubes 54 are fixedly connected to the top of the inner wall of the top platform 2. The push rod assembly 35 includes multiple pneumatic connecting rods 351, the bottom of which is fixedly connected to the bottom of the inner wall of the same protective box 32. A sliding rod 352 is fixedly connected to the top of which is fixedly connected. The inner wall of the base 1 is fixedly connected with multiple inner tubes 353. The adjacent sides of the multiple inner tubes 353 are connected to the left and right sides of the same inner air pipe 33. The exhaust assembly 36 includes an air pump 362. The bottom of the air pump 362 is fixedly connected to the front side of the inside of the protective box 32. The rear side of the air pump 362 is connected to an air suction hose 361. The top of the air suction hose 361 is connected to the front side of the bottom of the inner air pipe 33. The front side of the air pump 362 is connected to an air outlet hose 363. The front side of the air outlet hose 363 is connected to the rear side of the exhaust port 34. Specifically, when the material conveying mechanism 5 is running, the bottom of the feeding pipe 51 is fixedly connected to the top of the top platform 2. The connecting plate 52, which is fixedly connected to the top of the feeding pipe 51, is fixedly connected to the external material supply structure through multiple screws 53 threaded to the top of the outer wall. The raw material for product injection molding is conveyed to the area of ​​the top platform 2 through the feeding pipe 51, and then enters the mold mechanism 4 through multiple injection pipes 54 fixedly connected to the top of the inner wall of the top platform 2. The multiple injection pipes 54 are connected to the top of the first mold 41, so that after the first mold 41 and the second mold 42 are sealed and fixed, the injection molding material can be injected into the first mold 41. Within the cavity formed together with mold 2 42, when the push rod assembly 35 is working, the bottoms of multiple pneumatic connecting rods 351 are all fixedly connected to the bottom of the inner wall of the same protective box 32. All pneumatic connecting rods 351 are of model CKZ3T50-90TM, enabling precise control of the connecting rod positioning during operation. After the multiple pneumatic connecting rods 351 are activated, they drive the sliding rods 352, which are fixedly connected to the top, to move up and down. Simultaneously, the adjacent sides of multiple inner tubes 353 fixedly connected to the inner wall of the base 1 are connected to the left and right sides of the same inner air pipe 33. Through the inner tubes 353 and the inner air pipe 33, the... This achieves the effect of orderly gas flow inside the base 1. When it is necessary to expel air from the mold mechanism 4, the pneumatic connecting rod 351 drives the sliding rod 352 to descend, connecting the inner pipe 353 with the inner air pipe 33. Since the inner pipe 353 is connected to the bottom of the mold 42, the gas in the cavity formed by the mold 41 and the mold 42 can be discharged through the inner pipe 353 and the inner air pipe 33. After the gas is discharged, the pneumatic connecting rod 351 drives the sliding rod 352 to rise, disconnecting the inner pipe 353 from the inner air pipe 33, thus achieving a sealed negative pressure in the mold mechanism 4. When the product is injected... After completion and thorough cooling, the pneumatic connecting rod 351 drives the slide bar 352 to continue rising, pushing the product out for easy removal by the operator. When the exhaust assembly 36 is running, the bottom of the air pump 362 is fixedly connected to the front of the inside of the protective box 32. When the air pump 362 is working, the flow rate is 0.6-2 m³ / min and the pressure is 1 MPa. After the air pump 362 is started, it draws gas from the bottom front of the inner air pipe 33 through the suction hose 361 connected to the rear. The drawn gas is delivered to the exhaust port 34 through the exhaust hose 363 connected to the front of the air pump 362.

[0022] Reference Figures 1-3The negative pressure mechanism 3 also includes a pressure gauge 38. The rear side of the pressure gauge 38 is located on the front side of the base 1. The bottom rear side of the pressure gauge 38 is connected to the front side of the connection port 37. The connecting component 45 includes multiple screws 451. The opposite sides of the multiple screws 451 are threaded to adjacent sides of the base 1 and the top platform 2. Multiple screw holes 452 are opened on adjacent sides of the mold 1 41 and the mold 2 42. The outer walls of the multiple screws 451 are threaded to the inner walls of the multiple screw holes 452. The lifting component 46 includes multiple support blocks 461. The adjacent sides of the multiple support blocks 461 are fixedly connected to the top outer wall of the same top platform 2. The opposite sides of the bottom of the multiple support blocks 461 are fixedly connected to pneumatic connecting rods 462. The bottom of the multiple pneumatic connecting rods 462 are fixedly connected to the top left and right sides of the same box cover 31. Specifically, the connecting component 45 includes multiple screws 451, with the opposite sides of the screws 451 threadedly connected to adjacent sides of the base 1 and the top platform 2. Multiple screw holes 452 are provided on adjacent sides of both mold 41 and mold 42. The outer walls of the screws 451 are threadedly connected to the inner walls of the screw holes 452. Through the threaded connections of the screws 451 to the base 1 and the top platform 2, and between the screws 451 and the screw holes 452, a stable connection is achieved between mold 41 within the top platform 2 and between mold 42 within the base 1. The lifting component 46 drives the mold mechanism 4 during operation. The lifting component 46 includes multiple support blocks 461, with adjacent sides of the support blocks 461 fixedly connected to the top outer wall of the same top platform 2. Pneumatic connecting rods 462 are fixedly connected to the opposite sides of the bottom of each support block 461. All two pneumatic linkages 462 adopt ISO-15552 standard pneumatic cylinders. The bottoms of multiple pneumatic linkages 462 are fixedly connected to the top left and right sides of the same box cover 31. Through the fixed connection between the support block 461 and the top platform 2, and the fixed connection between the pneumatic linkages 462 and the support block 461 and the box cover 31 respectively, the top platform 2 is able to lift or lower the box cover 31 by driving the pneumatic linkages 462. The pressure gauge 38 in the negative pressure mechanism 3 can realize the monitoring of the negative pressure state. The pressure gauge 38 is located on the front side of the base 1. The bottom rear side of the pressure gauge 38 is connected to the front side of the connection port 37. Through the positional cooperation between the pressure gauge 38 and the base 1, and the connection between the pressure gauge 38 and the connection port 37, the negative pressure value at the connection port 37 is fed back in real time through the pressure gauge 38, ensuring that the operator can grasp and control the negative pressure state in the device.

[0023] Working principle: When the mold mechanism 4 is activated for molding, the lifting component 46 enters the working state. Through the transmission cooperation between the lifting component 46 and the top platform 2, the top platform 2 and the base 1 are driven to fit tightly together, causing mold 1 41 to move towards mold 2 42, which is closer to the top of the inner wall of the base 1. As mold 1 41 moves, the sealing ring 1 43, which is fixedly connected to the bottom of its outer wall, moves synchronously. When mold 1 41 and mold 2 42 gradually approach the preset position, the sealing ring 1 43 and the sealing ring 2 44, which is fixedly connected to the top of the outer wall of mold 2 42, come into contact with each other. The sealing effect between mold 1 41 and mold 2 42 is achieved through their contact. Component 46 includes multiple support blocks 461. The adjacent sides of the multiple support blocks 461 are fixedly connected to the top outer wall of the same top platform 2. The bottom sides of the multiple support blocks 461 are fixedly connected to pneumatic connecting rods 462. The multiple pneumatic connecting rods 462 are all ISO-15552 standard pneumatic cylinders, and their bottoms are all fixedly connected to the top left and right sides of the same box cover 31. Through the fixed connection between the support blocks 461 and the top platform 2, and the fixed connection between the pneumatic connecting rods 462 and the support blocks 461 and the box cover 31 respectively, the top platform 2 drives the box cover 31 to be raised or lowered through the pneumatic connecting rods 462. The connecting component 45 in the mold mechanism 4 can tightly fix mold 1 41 and mold 2 42 in the base 1 and the top platform 2 respectively. The connecting component 45 includes a plurality of screws 451. The opposite sides of the plurality of screws 451 are threaded to the adjacent sides of the base 1 and the top platform 2 respectively. A plurality of screw holes 452 are provided on the adjacent sides of mold 1 41 and mold 2 42. The outer walls of the plurality of screws 451 are threaded to the inner walls of the plurality of screw holes 452 respectively. Through the threaded connection of screws 451 to the base 1 and the top platform 2, and the threaded connection of screws 451 to screw holes 452, the stable connection of mold 1 41 in the top platform 2 and the stable connection of mold 2 42 in the base 1 are achieved. When it is necessary to replace the mold, the connecting component 45 can easily release the locked connection state of mold 1 41 and mold 2 42, and re-fix it after the replacement is completed. The negative pressure mechanism 3 is activated to expel air from the mold, maintaining a sealed negative pressure state inside the mold mechanism 4. The top of the cover 31 in the negative pressure mechanism 3 is fixedly connected to the bottom of the base 1, providing an installation base for other components of the negative pressure mechanism 3. The protective box 32 is fixedly connected to the bottom of the cover 31 to protect the internal components. The inner air pipe 33, fixedly connected to the inner wall of the base 1, allows air circulation. After the exhaust assembly 36 operates and expels the air from the mold mechanism 4, the push rod assembly 35 at the bottom of the inner wall of the protective box 32 begins to move. The push rod assembly 35 rises to close the inner air pipe 33, maintaining a negative pressure state inside the mold mechanism 4. This is achieved through the push rod assembly 35 and the exhaust assembly 36. In conjunction with this, the air inside the mold enters the protective box 32 through the inner air pipe 33 and the connection port 37 on the front side of the outer wall of the base 1, and then exits from the exhaust port 34 on the front side of the outer wall of the protective box 32. This achieves the function of venting the air inside the mold mechanism 4 and forming a closed negative pressure, thereby avoiding overflow and injection blockage caused by the presence of air during subsequent injection molding. The pressure gauge 38 in the negative pressure mechanism 3 can monitor the negative pressure status. The rear side of the pressure gauge 38 is set on the front side of the base 1, and its bottom rear side is connected to the front side of the connection port 37. It can provide real-time feedback of the negative pressure value at the connection port 37, ensuring that the operator can grasp and control the negative pressure status inside the device. When the mold mechanism 4 reaches the set closed negative pressure state, the material conveying mechanism 5 on the top of the top platform 2 starts to work. The material conveying mechanism 5 conveys the injection molding material to the mold mechanism 4 set between the base 1 and the top platform 2. The mold mechanism 4 shapes the injection molding material. Through the synergistic action of the material conveying mechanism 5 and the mold mechanism 4, the injection molding effect of the car steering wheel trim is achieved. When the material conveying mechanism 5 is running, the bottom of the feeding pipe 51 is fixedly connected to the top of the top platform 2. The connecting plate 52 fixedly connected to the top of the feeding pipe 51 is fixedly connected to the external material supply structure through multiple screws 53 threaded to the top of the outer wall. After the material for product injection is conveyed to the area of ​​the top platform 2 through the feeding pipe 51, it enters the mold mechanism 4 through multiple injection pipes 54 fixedly connected to the top of the inner wall of the top platform 2. The multiple injection pipes 54 are connected to the top of the mold 1 41, so that after the mold 1 41 and the mold 2 42 are sealed and fixed, the injection molding material can be injected into the cavity formed by the two. After the product molding operation is completed, the lifting component 46 reverses its movement. Through the reverse transmission between the lifting component 46 and the top platform 2, mold 1 41 is moved away from mold 2 42 until mold 1 41 returns to its initial position. The reverse movement of the lifting component 46 and the transmission of the top platform 2 achieve the separation of mold 1 41 and mold 2 42. Furthermore, when the push rod assembly 35 is working, the bottoms of multiple pneumatic connecting rods 351 are fixedly connected to the bottom of the inner wall of the same protective box 32. All pneumatic connecting rods 351 are of model CKZ3T50-90TM, enabling precise control of the connecting rod positioning during operation. After startup... The sliding rod 352, which is fixedly connected to the top, moves up and down. At the same time, the adjacent sides of the multiple inner tubes 353, which are fixedly connected to the inner wall of the base 1, are connected to the left and right sides of the same inner air pipe 33. The inner tubes 353 and the inner air pipe 33 achieve the effect of orderly flow of gas inside the base 1. When it is necessary to discharge the air in the mold mechanism 4, the pneumatic connecting rod 351 drives the sliding rod 352 to descend, so that the inner tubes 353 and the inner air pipe 33 are connected. Since the inner tubes 353 are connected to the bottom of the mold 42, the gas in the cavity formed by the mold 41 and the mold 42 can be discharged through the inner tubes 353 and the inner air pipe 33. When the exhaust assembly 36 is running, the bottom of the air pump 362 is fixedly connected to the front of the interior of the protective box 32. The air pump 362 operates at a flow rate of 0.6-2 m³ / min and a pressure of 1 MPa. After starting, it draws gas from the front of the bottom of the inner air pipe 33 through the suction hose 361 connected to the rear. The drawn gas is then transported to the exhaust port 34 through the exhaust hose 363 connected to the front of the air pump 362. After the gas is completely discharged, the pneumatic connecting rod 351 drives the slide rod 352 to rise, severing the connection between the inner through pipe 353 and the inner air pipe 33, thus achieving a sealed negative pressure in the mold mechanism 4. When the product injection is completed and completely cooled and solidified, the negative pressure mechanism 3 stops working, the exhaust assembly 36 resets, the mold mechanism 4 opens, and the pneumatic connecting rod 351 drives the slide rod 352 to continue rising, pushing the product out. The operator can then remove the molded automotive steering wheel trim. Thus, the mold mechanism 4 completes one full operation cycle.

[0024] 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 injection mold for preventing spillage of automotive steering wheel trim, comprising a base (1) and a top platform (2), characterized in that: The bottom of the base (1) is provided with a negative pressure mechanism (3), which is used to discharge air before injection molding to make the mold sealed with negative pressure. A mold mechanism (4) is provided between the adjacent base (1) and the top platform (2), which is used for mold injection molding to form an assembly. A material conveying mechanism (5) is provided on the top of the top platform (2). The negative pressure mechanism (3) includes a box cover (31), the top of which is fixedly connected to the bottom of the base (1), a protective box (32) is fixedly connected to the bottom of the box cover (31), an inner air pipe (33) is fixedly connected to the inner wall of the base (1), an exhaust port (34) is provided on the front side of the outer wall of the protective box (32), a push rod assembly (35) is provided on the bottom of the inner wall of the protective box (32), an exhaust assembly (36) is provided on the front side of the inner wall of the protective box (32), and a connection port (37) is provided on the front side of the outer wall of the base (1), the rear side of the connection port (37) is connected to the front side of the inner air pipe (33).

2. The injection mold for preventing spillage of automotive steering wheel trim parts according to claim 1, characterized in that: The mold mechanism (4) includes a mold one (41), the top of the mold one (41) is located at the bottom of the inner wall of the top platform (2), the top of the inner wall of the base (1) is provided with a mold two (42), the bottom of the outer wall of the mold one (41) is fixedly connected with a sealing ring one (43), the top of the outer wall of the mold two (42) is fixedly connected with a sealing ring two (44), a connecting component (45) is provided on the adjacent side of the mold one (41) and the mold two (42), and a lifting component (46) is provided on the top outer wall of the top platform (2).

3. The injection mold for preventing spillage of automotive steering wheel trim parts according to claim 1, characterized in that: The material conveying mechanism (5) includes a feeding pipe (51), the bottom of which is fixedly connected to the top of the top platform (2), and a connecting plate (52) is fixedly connected to the top of the feeding pipe (51). Multiple screws (53) are threadedly connected to the top of the outer wall of the connecting plate (52), and multiple injection tubes (54) are fixedly connected to the top of the inner wall of the top platform (2).

4. The injection mold for preventing spillage of automotive steering wheel trim parts according to claim 1, characterized in that: The push rod assembly (35) includes multiple pneumatic connecting rods (351), the bottom of which is fixedly connected to the bottom of the inner wall of the same protective box (32), and the top of which is fixedly connected to a slide rod (352). The inner wall of the base (1) is fixedly connected to multiple inner tubes (353), and the adjacent sides of the multiple inner tubes (353) are connected to the left and right sides of the same inner air pipe (33).

5. The injection mold for preventing spillage of automotive steering wheel trim parts according to claim 1, characterized in that: The exhaust assembly (36) includes an air pump (362), the bottom of which is fixedly connected to the front of the interior of the protective box (32). The rear of the air pump (362) is connected to an air intake hose (361), the top of which is connected to the front of the bottom of the inner air pipe (33). The front of the air pump (362) is connected to an air outlet hose (363), and the front of the air outlet hose (363) is connected to the rear of the exhaust port (34).

6. The injection mold for preventing spillage of automotive steering wheel trim parts according to claim 1, characterized in that: The negative pressure mechanism (3) also includes a pressure gauge (38), the rear side of which is located on the front side of the base (1), and the bottom rear side of the pressure gauge (38) is connected to the front side of the connection port (37).

7. The injection mold for preventing spillage of automotive steering wheel trim parts according to claim 2, characterized in that: The connecting assembly (45) includes a plurality of screws (451), with the opposite sides of the plurality of screws (451) threadedly connected to adjacent sides of the base (1) and the top platform (2). A plurality of screw holes (452) are provided on adjacent sides of the mold (41) and the mold (42), and the outer walls of the plurality of screws (451) are threadedly connected to the inner walls of the plurality of screw holes (452).

8. The injection mold for preventing spillage of automotive steering wheel trim parts according to claim 2, characterized in that: The lifting assembly (46) includes multiple support blocks (461). The adjacent sides of the multiple support blocks (461) are fixedly connected to the top outer wall of the same top platform (2). The bottom sides of the multiple support blocks (461) are fixedly connected to pneumatic connecting rods (462). The bottoms of the multiple pneumatic connecting rods (462) are fixedly connected to the top left and right sides of the same box cover (31).

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