A plastic rear lamp cover injection molding die and a multi-link demolding forming mechanism

Abstract

The application relates to a plastic rear tail lamp cover injection molding mold and a multi-connecting-rod demolding forming mechanism, which comprises a core mold, a top plate assembly, a main pulling block, a main linkage mechanism and a positioning protrusion core pulling mechanism. The top plate assembly is composed of a main top plate, a driven top plate and a connecting piece, the main top plate is first lifted by a distance and then synchronously pushes out the driven top plate. The main pulling block is connected with the driven top plate, the inner wall of the lamp cover mounting part and the reverse buckle face can be used for composite direction core pulling. The positioning protrusion core pulling mechanism comprises a protrusion pulling block, a built-in inner core pulling mechanism and an externally connected outer linkage mechanism, and the opening and closing of the protrusion pulling block is switched by the action of the main top plate. The outer linkage mechanism is separated by the action of the main top plate first, positioning protrusion core pulling is completed first, then the reverse buckle demolding and product ejection are realized by the composite movement of the main pulling block, and the product wall thickness is prevented from being damaged by direct pulling. The inner and outer split driving structures are adopted, the driving structure does not need to be integrated in the main pulling block, the machining difficulty is reduced, and meanwhile, the forming quality and smooth demolding are ensured.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to an injection mold for a plastic taillight cover and a multi-link demolding mechanism. Background Technology

[0002] Plastic taillight cover, such as Figure 1 As shown, it includes a lampshade body 21 and a lampshade mounting part 22. An obtuse angle is formed between the lampshade body 21 and the lampshade mounting part 22. The end of the lampshade mounting part 22 away from the lampshade body 21 has an overhang 23, and its inner wall has a positioning protrusion 24 for positioning.

[0003] like Figure 2 As shown, for the lampshade mounting part 22, the traditional demolding method often adopts an integral slider direct core-pulling structure, directly pulling the core-pulling block along the core-pulling direction of the undercut 23. However, because the distance between the core-pulling block and the lampshade body 21 is too close during the direct pulling process, the molding wall thickness of the core mold 11 corresponding to the lampshade body 21 is designed to be extremely thin, which cannot withstand the impact pressure of the high-pressure melt during injection molding. At the same time, in the molding of the positioning protrusion 24, a core-pulling structure with a different direction needs to be designed inside the core-pulling block, which makes the core-pulling mechanism more complex and significantly increases the design difficulty and processing accuracy requirements of the mold. Summary of the Invention

[0004] In order to enable the plastic taillight cover to be successfully demolded without affecting the structural strength of the mold, this application provides a plastic taillight cover injection molding mold and a multi-link demolding mechanism.

[0005] The multi-link demolding and molding mechanism provided in this application adopts the following technical solution: A plastic taillight cover injection molding mold and a multi-link demolding molding mechanism include a core mold, a top plate assembly, a main ejector block, a main linkage mechanism, and a positioning protrusion core-pulling mechanism. The top plate assembly includes a main top plate, a driven top plate, and a connecting member. After the main top plate is first ejected a preset distance, it drives the driven top plate to perform an ejection movement synchronously through the connecting member. The main ejector block is connected to the driven top plate through the main linkage mechanism. The main ejector block is used to mold the inner surface of the taillight cover mounting part and the inner side of the inverted part. During the mold opening and ejection operation, the molded plastic taillight cover is ejected along the mold opening direction, and at the same time, the driven top plate drives the main pull block to move along the composite direction of the mold opening direction and the undercut core pulling direction through the main linkage mechanism. The positioning protrusion core-pulling mechanism includes a protrusion pulling block, an inner core-pulling mechanism, and an outer linkage mechanism. The protrusion pulling block is slidably embedded inside the main pulling block along the core-pulling direction of the positioning protrusion. The inner core-pulling mechanism is disposed inside the main pulling block and is drivenly connected to the protrusion pulling block. The outer linkage mechanism is drivenly connected to the main top plate. In the mold closing state, the output end of the external linkage mechanism is located inside the main pulling block and abuts against the input end of the internal core pulling mechanism, and the protruding pulling block is reset to the injection molding state; during the process of the main top plate being lifted a preset distance, the output end of the external linkage mechanism moves to disengage from the main pulling block, and the internal core pulling mechanism drives the protruding pulling block to move to the core pulling state along one side of the core pulling direction.

[0006] By adopting the above technical solution, when the mold is closed, the main ejector block and the raised ejector block are in the forming position, and the external linkage mechanism abuts against the internal core-pulling mechanism to ensure accurate forming; when the mold is opened, the main top plate is lifted first, which drives the external linkage mechanism to disengage, and the internal core-pulling mechanism drives the raised ejector block to pull the core; then the main top plate drives the driven top plate to move, and the main ejector block is driven to move along the composite direction through the main linkage mechanism to complete the undercut core pulling and overall ejection, which can avoid the direct pulling of the main ejector block and does not affect the forming wall thickness of the corresponding lampshade body on the core mold. Since the main core-pulling block needs to be moved as a whole for core-pulling, and the driving source for the raised core-pulling block cannot be fully integrated into the main core-pulling block, the internal core-pulling mechanism and the external linkage mechanism are separated. The external linkage mechanism is connected to the main top plate and is responsible for acting on the internal core-pulling mechanism when the mold is closed. Then the internal core-pulling mechanism drives the raised core-pulling block to reset. When the mold is opened, it moves with the main top plate and disengages from the internal core-pulling mechanism. It does not need to be integrated into the main core-pulling block, which simplifies the structural design of the main core-pulling block, reduces its processing difficulty, and ensures the molding accuracy of the positioning protrusion and the smoothness of demolding.

[0007] Preferably, the main linkage mechanism includes a first push rod, a slide block, and a guide rod. The slide block is fixedly mounted on the main pull block. One end of the first push rod is fixedly mounted on the driven top plate. The other end of the first push rod is slidably connected to the slide block along the inverted core-pulling direction. One end of the guide rod is fixedly mounted on the main pull block. The guide rod slides within the core mold along the composite direction.

[0008] By adopting the above technical solution, when the mold is opened and ejected, the driven top plate drives the first ejector rod to move. With the cooperation of the slide block and the guide rod, the linear motion in the mold opening direction is converted into the compound directional sliding of the main ejector block, which can avoid the main ejector block being pulled straight out and make it detach from the lampshade mounting part.

[0009] Preferably, the inner core-pulling mechanism includes a relief rod, a blocking block, a first spring and a second spring. The main core-pulling block has a first sliding groove and a second sliding groove that are open through it in different directions and are interconnected. The protruding core-pulling block is slidably assembled in the first sliding groove, and the relief rod is slidably assembled in the second sliding groove. The raised pull block has a first stepped block at the end away from the positioning protrusion, and the avoidance rod has a second stepped block at the end near the external linkage mechanism. Correspondingly, the first slide groove has an integrally formed first stepped groove that matches the sliding of the first stepped block. The first stepped block has a first receiving groove for installing the first spring. The two ends of the first spring abut against the bottom wall of the first receiving groove and the end of the first stepped groove, respectively. The first spring provides a driving force for the raised pull block in the direction of core pulling. The second slide groove has an integrally formed second stepped groove that matches the sliding of the second stepped block. The second stepped block has a second receiving groove for installing the second spring. The two ends of the second spring abut against the bottom wall of the second receiving groove and the end of the second stepped groove, respectively. The second spring provides a driving force for the avoidance rod to move towards the side of the external linkage mechanism. The blocking block is fixedly installed on the main pull block and is located on the moving path of the avoidance rod. It is used to abut and limit the avoidance rod when it moves towards the side of the external linkage mechanism, preventing the avoidance rod from disengaging from the second slide groove. The raised pull block is located on the side of the avoidance rod near the positioning protrusion. The side of the avoidance rod facing the raised pull block has a back groove for accommodating the end of the raised pull block. The groove wall and the corresponding end of the raised pull block have mutually cooperating inclined surfaces. When the avoidance rod is driven to reset by the external linkage mechanism, it drives the raised pull block to reset to the injection molding state through the cooperation of the two inclined surfaces. When the external linkage mechanism disengages from the avoidance rod, the avoidance rod moves towards the side of the external linkage mechanism, and the end of the raised pull block enters the back groove to achieve core pulling.

[0010] By adopting the above technical solution, in the mold-closed state, the output end of the external linkage mechanism abuts against the clearance rod, overcoming the elastic force of the second spring and pushing the clearance rod to move closer to the positioning protrusion. The clearance rod, through the cooperation of the inclined surface, squeezes the protruding block, overcoming the elastic force of the first spring and pushing the protruding block back to the injection molding position. At this time, the protruding block accurately forms the positioning protrusion. When the mold opens, the main ejector plate first lifts up, causing the output end of the external linkage mechanism to disengage from the clearance rod. Under the driving force of the second spring, the clearance rod moves towards the side of the external linkage mechanism and finally abuts against the block. At this time, the retraction groove on the clearance rod moves to the position directly opposite the end of the protruding block. Under the driving force of the first spring, the protruding block moves along the first slide groove in the core-pulling direction, and its end enters the retraction groove, completing the core-pulling of the positioning protrusion. Since the elastic force of the spring is unidirectional, the elastic force of the first spring and the second spring is used as the power in the core-pulling direction, and then the external linkage mechanism is used as the external driving source to apply the power in the reset direction to the clearance rod and the protruding block.

[0011] Preferably, the avoidance rod has an abutment groove on the side facing the protruding block. The abutment groove is connected to the retraction groove and the connection is smooth. The bottom wall of the abutment groove is parallel to the end face of the protruding block away from the positioning protrusion. When the avoidance rod is reset, the end of the protruding block is tightly abutted against the bottom wall of the abutment groove.

[0012] By adopting the above technical solution, the cooperation structure between the avoidance rod and the raised pull block is further optimized, significantly improving the support strength and stability of the avoidance rod for the raised pull block in the reset state. When the avoidance rod resets, the end of the raised pull block tightly abuts against the bottom wall of the abutment groove. Since the bottom wall of the abutment groove and the end face of the raised pull block are parallel, the contact between the two is a surface contact. Compared with traditional line contact or point contact, the contact area is larger and the force is more uniform, ensuring the forming accuracy and surface quality of the positioning protrusion.

[0013] Preferably, the end of the avoidance rod away from the external linkage mechanism is used to form the inner surface of the lampshade mounting part. When the avoidance rod is reset, the avoidance rod is in the injection molding state. When the avoidance rod abuts against the block, the front end of the avoidance rod is cored to form an avoidance cavity. An air passage is opened in the main draw block. One end of the air passage is connected to the avoidance cavity, and the other end of the air passage passes through the main draw block and is connected to the air supply device through a hose.

[0014] By adopting the above technical solution, after the clearance rod is removed, not only can the necessary space for the core pulling of the protruding block be formed, ensuring the smooth completion of the core pulling action, but the formation of the clearance cavity also exposes the air passage outlet. The air supply device supplies air into the air passage through the hose, and the gas enters the clearance cavity through the air passage, forming an air-floating support on the inner surface of the taillight cover to be demolded. This assists in the smooth separation of the plastic taillight cover from the mold forming surface, improves the surface forming quality of the plastic taillight cover, and reduces the demolding resistance, ensuring a smooth and efficient demolding process.

[0015] Preferably, the second groove is inclined toward the lampshade body.

[0016] By adopting the above technical solution, the gas entering the clearance cavity through the air passage can be precisely guided to one side of the lamp cover body under the guidance of the second slide groove. Since the lamp cover body mainly relies on the top block set on the edge to lift and separate from the core mold, the air flotation can first separate the forming surface of the lamp cover body from the forming surface of the core mold, thereby improving the forming effect of the inner surface of the lamp cover body.

[0017] Preferably, the external linkage mechanism includes a second push rod and a drive rod. One end of the second push rod is fixedly mounted on the main top plate, and the other end of the second push rod is bent. The drive rod is slidably connected to the core mold along a sliding direction parallel to the clearance rod. A composite groove is provided through the drive rod. The end of the second push rod away from the main top plate is slidably connected to the composite groove. The composite groove includes a straight groove along the mold opening and closing direction and an inclined groove along the inclined direction of the bent part of the second push rod. In the mold-closed state, the end of the drive rod extends into the second slide groove and abuts against the relief rod; when the main top plate first pushes up a preset distance, the second push rod slides in the inclined groove, driving the drive rod to move away from the relief rod and out of the main pull block; when the main top plate and the driven top plate push out synchronously, the second push rod slides in the straight groove, and the drive rod remains stationary in the core mold.

[0018] By adopting the above technical solution, in the mold-closed state, the bent end of the second ejector rod is located in the inclined groove, and the end of the drive rod extends into the second sliding groove and abuts against the relief rod, keeping the relief rod in the reset state. When the mold opens, the main ejector plate first lifts up a preset distance, driving the second ejector rod to move synchronously. At this time, the second ejector rod slides in the inclined groove of the composite groove. Since the inclined groove is set along the inclined direction of the bent part of the second ejector rod, it drives the drive rod to move away from the relief rod, and finally disengages from the main ejector block, releasing the relief rod. When the main ejector plate drives the driven ejector plate to be ejected synchronously through the connecting piece, the second ejector rod slides into the straight groove of the composite groove. Since the straight groove is set along the mold opening and closing direction, the movement of the second ejector rod at this time will not drive the drive rod to move. The drive rod remains stationary in the core mold, ensuring that the inner core pulling mechanism stably completes the core pulling action.

[0019] Preferably, the connector includes a hook block and a fixing block, the hook block is fixedly installed on the main top plate, the fixing block is fixedly installed on the driven top plate, and the hook block is used to hook the fixing block.

[0020] By adopting the above technical solution, the hook block and the fixed block remain separated during the mold closing state and the initial lifting stage of the main ejector plate. This effectively avoids the driven ejector plate from moving synchronously when the main ejector plate lifts first, ensuring that the main ejector plate can smoothly complete the lifting action of the preset distance. This provides sufficient time for the external linkage mechanism to disengage and the internal core-pulling mechanism to pull the core. When the main ejector plate is lifted to the preset distance, the hook block accurately hooks the fixed block. At this time, the main ejector plate continues to lift, which can smoothly and reliably drive the driven ejector plate to perform the ejection movement synchronously. This ensures that the main linkage mechanism can promptly drive the main pulling block to complete the core pulling in the compound direction and the overall ejection of the product, avoiding problems such as linkage jamming and uneven force distribution. This further improves the operational stability and reliability of the demolding mechanism.

[0021] This application also provides a plastic taillight cover injection molding mold with the following technical solution: A plastic taillight cover injection molding mold, which uses the above-mentioned multi-link demolding molding mechanism.

[0022] The main technical effects of this invention are reflected in the following aspects: 1. In this invention, when the mold is opened and ejected, the driven top plate drives the first ejector rod to move. With the cooperation of the slide block and the guide rod, the linear motion in the mold opening direction is converted into the composite sliding of the main ejector block, which can avoid the main ejector block being pulled straight out and make it detach from the lampshade mounting part.

[0023] 2. After the clearance rod of the present invention is removed, it not only forms the necessary space for the protruding core to be pulled out, ensuring the smooth completion of the core pulling action, but also exposes the air passage outlet. The air supply device supplies air into the air passage through the hose. The gas enters the clearance cavity through the air passage and forms an air-floating support on the inner surface of the taillight cover to be demolded. This helps the plastic taillight cover to separate smoothly from the mold forming surface, improves the surface forming quality of the plastic taillight cover, and reduces the demolding resistance, ensuring a smooth and efficient demolding process. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of the plastic taillight cover of this application.

[0025] Figure 2 This is a schematic diagram of using a straight core-pulling structure to demold the undercut.

[0026] Figure 3 This is a schematic diagram of the overall structure of the molding die in the embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the cavity mold of an embodiment of this application.

[0028] Figure 5 This is a schematic diagram of the core mold of an embodiment of this application.

[0029] Figure 6 This is a schematic diagram of the ejector component in an embodiment of this application.

[0030] Figure 7 This is a schematic diagram of the structure of the multi-link demolding and molding mechanism according to an embodiment of this application.

[0031] Figure 8 yes Figure 5 A partial sectional view along line AA.

[0032] Figure 9 yes Figure 7 A cross-sectional view along the EE line.

[0033] Figure 10 This is a schematic diagram of the core-pulling mechanism and the protruding pulling block installed on the main pulling block in the embodiments of this application.

[0034] Figure 11 yes Figure 5 A partial sectional view along line BB.

[0035] Figure 12 This is a cross-sectional view of the multi-link demolding and forming mechanism when the main top plate is first lifted up a preset distance.

[0036] Figure 13 yes Figure 11 Enlarged view of point C in the middle.

[0037] Figure 14 yes Figure 12 Enlarged view of point D in the middle.

[0038] Explanation of reference numerals in the attached drawings: 11. Core mold; 12. Cavity mold; 2. Plastic rear taillight cover; 21. Main body of the cover; 22. Mounting part of the cover; 23. Undercut; 24. Positioning protrusion; 3. Top plate assembly; 31. Main top plate; 32. Driven top plate; 33. Hook block; 34. Fixing block; 4. Ejector; 41. Connecting rod; 42. Ejector block; 5. Main pull block; 51. First slide groove; 52. Second slide groove; 53. First step groove; 54. Second step groove; 6. Main linkage mechanism; 61. First ejector rod; 62. 63. Slide; 71. Guide rod; 71. Protruding pull block; 711. First step block; 712. First receiving groove; 8. Inner core pulling mechanism; 81. Avoidance rod; 811. Second step block; 812. Second receiving groove; 813. Retreat groove; 814. Abutment groove; 82. Block; 83. First spring; 84. Second spring; 85. Inclined surface; 86. Air passage; 87. Avoidance cavity; 9. External linkage mechanism; 91. Second push rod; 92. Drive rod; 93. Composite groove; 931. Straight groove; 932. Inclined groove. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1 , Figures 3-14 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0040] This application discloses an injection molding mold for a plastic taillight cover and a multi-link demolding mechanism.

[0041] Reference Figure 1 , Figures 3-8This embodiment of a plastic taillight cover injection molding mold and multi-link demolding mechanism includes a core mold 11, a cavity mold 12, a top plate assembly 3, an ejector 4, a main pull block 5, a main linkage mechanism 6, and a positioning protrusion core-pulling mechanism. The core mold 11 and the cavity mold 12 are closed to form the molding cavity of the plastic taillight cover 2. The top plate assembly 3 includes a main top plate 31, a driven top plate 32, and a connector. The main top plate 31 first lifts up a preset distance, and then drives the driven top plate 32 to perform a synchronous ejection movement through the connector. To facilitate the installation of the ejector 4, the driven top plate 32 is usually composed of an upper top plate and a lower top plate fixedly spliced ​​together, and the main top plate 31 is driven by a hydraulic cylinder.

[0042] Reference Figure 1 , Figures 3-8 The main pull block 5 is connected to the driven top plate 32 via the main linkage mechanism 6. The main pull block 5 is used to form the inner surface of the lamp cover mounting part 22 and the inner side of the undercut 23. The ejector 4 includes multiple connecting rods 41 and multiple ejector blocks 42. The connecting rods 41 slide in the core mold 11 along the mold opening and closing direction. The two ends of the connecting rods 41 are respectively fixed on the driven top plate 32 and the corresponding ejector block 42. The multiple ejector blocks 42 are distributed sequentially along the edge of the plastic taillight cover 2 and are used to lift the plastic taillight cover 2 for demolding.

[0043] Reference Figure 1 , Figures 5-8 During the mold opening and ejection operation, the molded plastic taillight cover 2 is ejected along the mold opening direction. At the same time, the driven top plate 32 drives the main pull block 5 to move along the composite direction of the mold opening direction and the core pulling direction of the undercut 23 through the main linkage mechanism 6.

[0044] Reference Figure 1 , Figures 6-10 The positioning protrusion core-pulling mechanism includes a protrusion pulling block 71, an inner core-pulling mechanism 8, and an outer linkage mechanism 9. The protrusion pulling block 71 is slidably embedded in the main pulling block 5 along the core-pulling direction of the positioning protrusion 24. The inner core-pulling mechanism 8 is located inside the main pulling block 5 and is connected to the protrusion pulling block 71 in a driving connection. The outer linkage mechanism 9 is connected to the main top plate 31 in a driving connection.

[0045] Reference Figure 11 and Figure 13 In the mold-closed state, the output end of the external linkage mechanism 9 is located inside the main core-pulling block 5 and abuts against the input end of the internal core-pulling mechanism 8, and the protruding core-pulling block 71 resets to the injection molding state. (Refer to...) Figure 12 and Figure 14 During the process of the main top plate 31 being lifted a preset distance, the output end of the external linkage mechanism 9 moves to disengage from the main core-pulling block 5, and the internal core-pulling mechanism 8 drives the protruding core-pulling block 71 to move to the core-pulling state along one side of the core-pulling direction.

[0046] Refer to Figure 6- Figure 14When the mold is closed, the main pull block 5 and the raised pull block 71 are in the forming position, and the external linkage mechanism 9 abuts against the internal core pulling mechanism 8 to ensure accurate forming. When the mold is opened, the main top plate 31 is lifted first, which drives the external linkage mechanism 9 to disengage, and the internal core pulling mechanism 8 drives the raised pull block 71 to pull the core. Then the main top plate 31 drives the driven top plate 32 to move, and the main pull block 5 is driven to move along the composite direction through the main linkage mechanism 6 to complete the undercut 23 core pulling and overall ejection. This can avoid the main pull block 5 being pulled straight and does not affect the forming wall thickness of the corresponding lampshade body 21 on the core mold 11. Since the main core-pulling block 5 needs to be moved as a whole for core-pulling, and the driving source of the raised core-pulling block 71 cannot be fully integrated into the main core-pulling block 5, the inner core-pulling mechanism 8 and the outer linkage mechanism 9 are separated. The outer linkage mechanism 9 is connected to the main top plate 31 for transmission and is responsible for acting on the inner core-pulling mechanism 8 in the mold closing state. Then the inner core-pulling mechanism 8 drives the raised core-pulling block 71 to reset. When the mold is opened, it moves with the main top plate 31 and disengages from the inner core-pulling mechanism 8. It does not need to be integrated into the main core-pulling block 5, which simplifies the structural design of the main core-pulling block 5, reduces its processing difficulty, and ensures the forming accuracy and demolding smoothness of the positioning protrusion 24.

[0047] Reference Figure 1 , Figures 5-7 The main linkage mechanism 6 includes a first push rod 61, a slide block 62, and a guide rod 63. The slide block 62 is fixedly mounted on the main pull block 5. One end of the first push rod 61 is fixedly mounted on the driven top plate 32, and the other end of the first push rod 61 is slidably connected to the slide block 62 along the core-pulling direction of the inverted buckle 23, preferably sliding in a manner that uses an I-shaped block and an I-shaped groove. One end of the guide rod 63 is fixedly mounted on the main pull block 5, and the guide rod 63 slides within the core mold 11 along the composite direction.

[0048] Reference Figure 1 , Figures 5-7 When the mold is opened and ejected, the driven top plate 32 drives the first ejector rod 61 to move. With the help of the cooperation of the slide block 62 and the guide rod 63, the linear motion in the mold opening direction is converted into the compound direction sliding of the main pull block 5, which can prevent the main pull block 5 from being pulled straight out and make it detach from the lamp cover mounting part 22.

[0049] Reference Figures 9-14 The inner core-pulling mechanism 8 includes a relief rod 81, a blocking block 82, a first spring 83 and a second spring 84. The main core-pulling block 5 has a first sliding groove 51 and a second sliding groove 52 that are open through and connected to each other in different directions. The protruding core-pulling block 71 is slidably assembled in the first sliding groove 51, and the relief rod 81 is slidably assembled in the second sliding groove 52.

[0050] Reference Figure 1 , Figures 9-14The raised pull block 71 has a first step block 711 at the end away from the positioning protrusion 24, and the avoidance rod 81 has a second step block 811 at the end near the external linkage mechanism 9. Correspondingly, the first slide groove 51 has an integrally formed first step groove 53 that matches the sliding of the first step block 711. The first step block 711 has a first receiving groove 712 for the installation of the first spring 83. The two ends of the first spring 83 abut against the bottom wall of the first receiving groove 712 and the end of the first step groove 53, respectively. The first spring 83 provides a driving force for the raised pull block 71 in the pulling direction. The second slide groove 52 has an integrally formed first step groove 711. A second step groove 54 is provided to match the sliding of the second step block 811. A second receiving groove 812 is provided on the second step block 811 for the installation of the second spring 84. The two ends of the second spring 84 abut against the bottom wall of the second receiving groove 812 and the end of the second step groove 54, respectively. The second spring 84 is used to provide a driving force for the avoidance rod 81 to move toward the side of the external linkage mechanism 9. The blocking block 82 is fixedly installed on the main draw block 5 by screws. It is located on the moving path of the avoidance rod 81 and is used to abut and limit the avoidance rod 81 when it moves toward the side of the external linkage mechanism 9, so as to prevent the avoidance rod 81 from disengaging from the second sliding groove 52.

[0051] Reference Figure 1 , Figures 9-14 The protruding pull block 71 is located on the side of the avoidance rod 81 near the positioning protrusion 24. A retraction groove 813 is provided on the side of the avoidance rod 81 facing the protruding pull block 71. The retraction groove 813 is used to accommodate the end of the protruding pull block 71. The groove wall of the retraction groove 813 and the corresponding end of the protruding pull block 71 are respectively provided with mutually cooperating inclined surfaces 85. When the avoidance rod 81 is driven to reset by the external linkage mechanism 9, it drives the protruding pull block 71 to reset to the injection molding state through the cooperation of the two inclined surfaces 85. When the external linkage mechanism 9 disengages from the avoidance rod 81, the avoidance rod 81 moves towards the side of the external linkage mechanism 9, and the end of the protruding pull block 71 enters the retraction groove 813 to realize core pulling.

[0052] Reference Figure 1 , Figures 9-14 In the mold-closed state, the output end of the external linkage mechanism 9 abuts against the relief rod 81, overcoming the elastic force of the second spring 84 and pushing the relief rod 81 to move closer to the positioning protrusion 24. The relief rod 81, through the cooperation of the inclined surface 85, squeezes the protruding pull block 71, overcoming the elastic force of the first spring 83 and pushing the protruding pull block 71 back to the injection molding position. At this time, the protruding pull block 71 precisely shapes the positioning protrusion 24. In order to limit the reset state of the protruding pull block 71 and the relief rod 81, the first step block 711 abuts against the end wall of the first step groove 53, and the second step block 811 abuts against the end wall of the second step groove 54.

[0053] Reference Figure 1 , Figures 9-14When the mold opens, the main top plate 31 first lifts up, causing the output end of the external linkage mechanism 9 to disengage from the relief rod 81. Under the driving force of the second spring 84, the relief rod 81 moves towards the external linkage mechanism 9 and finally abuts against the block 82. At this time, the retraction groove 813 on the relief rod 81 moves to the position directly opposite the end of the protruding pull block 71. Under the driving force of the first spring 83, the protruding pull block 71 moves along the first slide groove 51 in the core-pulling direction, and its end enters the retraction groove 813, completing the core-pulling of the positioning protrusion 24. Since the spring force is unidirectional, the spring force of the first spring 83 and the second spring 84 is used as the power in the core-pulling direction. Then, the external linkage mechanism 9 is used as the external driving source to apply the reset power to the relief rod 81 and the protruding pull block 71.

[0054] Reference Figure 1 , Figures 9-14 The avoidance rod 81 has an abutment groove 814 on the side facing the protruding pull block 71. The abutment groove 814 is connected to the retraction groove 813 and the connection is smooth. The bottom wall of the abutment groove 814 is parallel to the end face of the protruding pull block 71 away from the positioning protrusion 24. When the avoidance rod 81 is reset, the end of the protruding pull block 71 is tightly abutted against the bottom wall of the abutment groove 814.

[0055] Reference Figure 1 , Figures 9-14 The mating structure between the avoidance rod 81 and the raised pull block 71 has been further optimized, significantly improving the support strength and stability of the avoidance rod 81 for the raised pull block 71 in the reset state. When the avoidance rod 81 is reset, the end of the raised pull block 71 is tightly abutted against the bottom wall of the abutment groove 814. Since the bottom wall of the abutment groove 814 is parallel to the end face of the raised pull block 71, the contact between the two is a surface contact. Compared with traditional line contact or point contact, the contact area is larger and the force is more uniform, ensuring the forming accuracy and surface quality of the positioning protrusion 24.

[0056] Reference Figure 9 , Figures 11-14 The end of the avoidance rod 81 away from the external linkage mechanism 9 is used to form the inner surface of the lampshade mounting part 22. When the avoidance rod 81 is reset, the avoidance rod 81 is in the injection molding state. When the avoidance rod 81 abuts against the block 82, the front end of the avoidance rod 81 is cored to form an avoidance cavity 87. An air passage 86 is opened in the main draw block 5. One end of the air passage 86 is connected to the avoidance cavity 87, and the other end of the air passage 86 passes through the main draw block 5 and is connected to the air supply device through a hose.

[0057] Reference Figures 11-14After the clearance rod 81 is removed, it not only creates the necessary space for the protruding pull block 71 to pull the core, ensuring the smooth completion of the core pulling action, but also exposes the outlet of the air passage 86 through the formation of the clearance cavity 87. The air supply device supplies air into the air passage 86 through the air passage 86 and the gas enters the clearance cavity 87 through the air passage 86, forming an air float support on the inner surface of the taillight cover to be demolded, which helps the plastic taillight cover 2 to separate smoothly from the mold forming surface, improves the surface forming quality of the plastic taillight cover 2, and reduces the demolding resistance, ensuring a smooth and efficient demolding process.

[0058] Reference Figures 11-14 The second slide 52 is inclined towards the side of the lampshade body 21.

[0059] Reference Figures 11-14 This allows the gas entering the clearance cavity 87 through the air passage 86 to be precisely guided to one side of the lampshade body 21 under the guidance of the second slide groove 52. Since the lampshade body 21 is mainly lifted off the core mold 11 by the top block 42 set on the edge, the forming surface of the lampshade body 21 and the core mold 11 can be separated first by air flotation, thereby improving the forming effect of the inner surface of the lampshade body 21.

[0060] Reference Figure 6 , Figures 11-14 The external linkage mechanism 9 includes a second ejector rod 91 and a drive rod 92. One end of the second ejector rod 91 is fixedly mounted on the main top plate 31, and the other end of the second ejector rod 91 is bent. The drive rod 92 is slidably connected to the core mold 11 along the sliding direction parallel to the avoidance rod 81. A composite groove 93 is provided through the drive rod 92. The end of the second ejector rod 91 away from the main top plate 31 is slidably connected to the composite groove 93. The composite groove 93 includes a straight groove 931 along the mold opening and closing direction and an inclined groove 932 along the inclined direction of the bent part of the second ejector rod 91.

[0061] Reference Figure 6 , Figures 11-14 In the mold-closed state, the end of the drive rod 92 extends into the second slide groove 52 and abuts against the relief rod 81; when the main top plate 31 first pushes up a preset distance, the second push rod 91 slides in the inclined groove 932, driving the drive rod 92 to move out of the main pull block 5 towards the side away from the relief rod 81; when the main top plate 31 and the driven top plate 32 are pushed out synchronously, the second push rod 91 slides in the straight groove 931, and the drive rod 92 remains stationary in the core mold 11.

[0062] Reference Figures 11-14In the mold-closed state, the bent end of the second ejector rod 91 is located in the inclined groove 932, and the end of the drive rod 92 extends into the second sliding groove 52 and abuts against the relief rod 81, keeping the relief rod 81 in the reset state. When the mold opens, the main ejector plate 31 first lifts up a preset distance, driving the second ejector rod 91 to move synchronously. At this time, the second ejector rod 91 slides in the inclined groove 932 of the composite groove 93. Since the inclined groove 932 is set along the inclined direction of the bent part of the second ejector rod 91, it drives the drive rod 92 to move away from the relief rod 81, and finally disengages from the main pull block 5, releasing the relief rod 81. When the main ejector plate 31 drives the driven ejector plate 32 to be ejected synchronously through the connecting piece, the second ejector rod 91 slides into the straight groove 931 of the composite groove 93. Since the straight groove 931 is set along the mold opening and closing direction, the movement of the second ejector rod 91 will not drive the drive rod 92 to move. The drive rod 92 remains stationary in the core mold 11, ensuring that the inner core pulling mechanism 8 stably completes the core pulling action.

[0063] Reference Figure 5 and Figure 6 The connector includes a hook block 33 and a fixing block 34. The hook block 33 is fixedly installed on the main top plate 31, and the fixing block 34 is fixedly installed on the driven top plate 32. The hook block 33 is used to hook the fixing block 34.

[0064] Reference Figures 5-14 In the mold closing state and during the initial lifting stage of the main ejector plate 31, the hook block 33 and the fixed block 34 remain separated, effectively preventing the driven ejector plate 32 from moving synchronously when the main ejector plate 31 lifts first. This ensures that the main ejector plate 31 can smoothly complete the lifting action of the preset distance, allowing sufficient time for the external linkage mechanism 9 to disengage and the internal core-pulling mechanism 8 to pull the core. When the main ejector plate 31 is lifted to the preset distance, the hook block 33 accurately hooks the fixed block 34. At this time, the main ejector plate 31 continues to lift, which can smoothly and reliably drive the driven ejector plate 32 to perform the ejection movement synchronously. This ensures that the main linkage mechanism 6 can drive the main pulling block 5 to complete the core pulling in the compound direction and the overall ejection of the product in a timely manner, avoiding problems such as linkage jamming and uneven force, and further improving the operational stability and reliability of the demolding mechanism.

[0065] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A multi-link demolding and molding mechanism, characterized in that: The system includes a core mold, a top plate assembly, a main ejector block, a main linkage mechanism, and a positioning protrusion ejector mechanism. The top plate assembly includes a main top plate, a driven top plate, and a connector. The main top plate first ejects a preset distance, and then drives the driven top plate to perform an ejection movement synchronously through the connector. The main ejector block is connected to the driven top plate through the main linkage mechanism. The main ejector block is used to form the inner surface of the lampshade mounting part and the inner side of the inverted part. During the mold opening and ejection operation, the molded plastic taillight cover is ejected along the mold opening direction, and at the same time, the driven top plate drives the main pull block to move along the composite direction of the mold opening direction and the undercut core pulling direction through the main linkage mechanism. The positioning protrusion core-pulling mechanism includes a protrusion pulling block, an inner core-pulling mechanism, and an outer linkage mechanism. The protrusion pulling block is slidably embedded inside the main pulling block along the core-pulling direction of the positioning protrusion. The inner core-pulling mechanism is disposed inside the main pulling block and is drivenly connected to the protrusion pulling block. The outer linkage mechanism is drivenly connected to the main top plate. In the mold-closed state, the output end of the external linkage mechanism is located inside the main pulling block and abuts against the input end of the internal core-pulling mechanism, and the protruding pulling block is reset to the injection molding state; during the process of the main top plate being lifted a preset distance, the output end of the external linkage mechanism moves to disengage from the main pulling block, and the internal core-pulling mechanism drives the protruding pulling block to move to the core-pulling state along one side of the core-pulling direction; The internal core-pulling mechanism includes a relief rod, a blocking block, a first spring, and a second spring. The main core-pulling block has a first sliding groove and a second sliding groove that are open through and connected to each other in different directions. The protruding core-pulling block is slidably assembled in the first sliding groove, and the relief rod is slidably assembled in the second sliding groove. The raised pull block has a first stepped block at the end away from the positioning protrusion, and the avoidance rod has a second stepped block at the end near the external linkage mechanism. Correspondingly, the first slide groove has an integrally formed first stepped groove that matches the sliding of the first stepped block. The first stepped block has a first receiving groove for installing the first spring. The two ends of the first spring abut against the bottom wall of the first receiving groove and the end of the first stepped groove, respectively. The first spring provides a driving force for the raised pull block in the direction of core pulling. The second slide groove has an integrally formed second stepped groove that matches the sliding of the second stepped block. The second stepped block has a second receiving groove for installing the second spring. The two ends of the second spring abut against the bottom wall of the second receiving groove and the end of the second stepped groove, respectively. The second spring provides a driving force for the avoidance rod to move towards the side of the external linkage mechanism. The blocking block is fixedly installed on the main pull block and is located on the moving path of the avoidance rod. It is used to abut and limit the avoidance rod when it moves towards the side of the external linkage mechanism, preventing the avoidance rod from disengaging from the second slide groove. The end of the avoidance rod away from the external linkage mechanism is used to form the inner surface of the lampshade mounting part. When the avoidance rod is reset, the avoidance rod is in the injection molding state. When the avoidance rod abuts against the block, the front end of the avoidance rod is cored to form an avoidance cavity. An air passage is opened in the main draw block. One end of the air passage is connected to the avoidance cavity, and the other end of the air passage passes through the main draw block and is connected to the air supply device through a hose.

2. The multi-link demolding and molding mechanism according to claim 1, characterized in that: The main linkage mechanism includes a first ejector rod, a slide block, and a guide rod. The slide block is fixedly mounted on the main pull block. One end of the first ejector rod is fixedly mounted on the driven top plate. The other end of the first ejector rod is slidably connected to the slide block along the inverted core-pulling direction. One end of the guide rod is fixedly mounted on the main pull block. The guide rod slides within the core mold along the composite direction.

3. The multi-link demolding and molding mechanism according to claim 1, characterized in that: The raised pull block is located on the side of the avoidance rod near the positioning protrusion. The side of the avoidance rod facing the raised pull block has a back groove for accommodating the end of the raised pull block. The groove wall and the corresponding end of the raised pull block have mutually cooperating inclined surfaces. When the avoidance rod is driven to reset by the external linkage mechanism, it drives the raised pull block to reset to the injection molding state through the cooperation of the two inclined surfaces. When the external linkage mechanism disengages from the avoidance rod, the avoidance rod moves towards the side of the external linkage mechanism, and the end of the raised pull block enters the back groove to achieve core pulling.

4. The multi-link demolding and molding mechanism according to claim 1, characterized in that: The avoidance rod has an abutment groove on the side facing the protruding block. The abutment groove is connected to the retraction groove and the connection is smooth. The bottom wall of the abutment groove is parallel to the end face of the protruding block away from the positioning protrusion. When the avoidance rod is reset, the end of the protruding block is tightly abutted against the bottom wall of the abutment groove.

5. The multi-link demolding and molding mechanism according to claim 1, characterized in that: The second groove is inclined toward the side of the lampshade body.

6. The multi-link demolding and molding mechanism according to claim 1, characterized in that: The external linkage mechanism includes a second ejector rod and a drive rod. One end of the second ejector rod is fixedly mounted on the main top plate, and the other end of the second ejector rod is bent. The drive rod is slidably connected to the core mold along the sliding direction parallel to the clearance rod. A composite groove is provided through the drive rod. The end of the second ejector rod away from the main top plate is slidably connected to the composite groove. The composite groove includes a straight groove along the mold opening and closing direction and an inclined groove along the inclined direction of the bent part of the second ejector rod. In the mold-closed state, the end of the drive rod extends into the second slide groove and abuts against the relief rod; when the main top plate first pushes up a preset distance, the second push rod slides in the inclined groove, driving the drive rod to move away from the relief rod and out of the main pull block; when the main top plate and the driven top plate push out synchronously, the second push rod slides in the straight groove, and the drive rod remains stationary in the core mold.

7. The multi-link demolding and molding mechanism according to claim 1, characterized in that: The connector includes a hook block and a fixing block. The hook block is fixedly installed on the main top plate, and the fixing block is fixedly installed on the driven top plate. The hook block is used to hook the fixing block.

8. A plastic taillight cover injection molding mold, characterized in that: The multi-link demolding and molding mechanism described in any one of claims 1-7 is applied.

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