A rear shell injection mold for a running light

Abstract

This invention relates to the field of mold technology, specifically to an injection mold for the rear shell of a vehicle light, comprising an upper mold with a core and a lower mold with a cavity. The lower part of the upper mold has a first movable mold, and the upper part of the lower mold has a second movable mold corresponding to the first movable mold. The upper mold contains a temperature-controlled drive structure that drives the first movable mold downwards when the upper mold is heated. The first and second movable molds, through their corresponding upper and lower mold plates, achieve step-by-step injection molding, precisely controlling the injection area. The entire dual-color vehicle light injection molding process can be completed without mold rotation, reducing the number of mold parts, lowering mold manufacturing and maintenance costs, shortening the molding cycle of a single product, and improving overall production efficiency.

Description

Technical Field

[0001] This invention relates to the field of mold technology, specifically to an injection mold for the rear shell of a vehicle light. Background Technology

[0002] Currently, most automotive dual-color headlight rear covers use a dual-color injection molding process, which is completed through two injection molding processes. The dual-color injection molding process involves molding two different materials or colors of plastic in the same mold through two injection molding processes. First, the first material is injected into the mold cavity to form part of the headlight structure. Then, the mold is rotated and moved to align the already formed part with the second injection unit. The second material is then injected to combine with the first material, forming a dual-color integrated headlight component. However, traditional injection molding methods that require rotation have many drawbacks. On the one hand, the operation of mold rotation and positioning takes a certain amount of time. On the other hand, the positioning accuracy after mold rotation may affect the alignment accuracy of the two-color materials. Furthermore, during the rotation of the mold, the formed part may be deformed by external forces. Therefore, a new injection mold for the rear shell of a daylight is proposed, which can achieve molding without rotation when injection molding two-color daylights. This reduces the number of mold parts, avoids problems such as gaps and misalignments between two-color materials caused by inaccurate rotation positioning, and shortens the molding cycle of a single product, thereby improving overall production efficiency. Summary of the Invention

[0003] To address the problems in the prior art, this invention provides an injection mold for the rear shell of a daytime running light, which enables molding without rotation when injection molding dual-color daytime running lights, shortening the molding cycle of a single product and thus improving overall production efficiency.

[0004] The technical solution adopted by the present invention to solve its technical problem is a vehicle light rear shell injection mold, including an upper mold with a core and a lower mold with a cavity. The lower part of the upper mold is provided with a first movable mold, and the upper part of the lower mold is provided with a second movable mold corresponding to the first movable mold. The upper mold is provided with a temperature control drive structure that drives the first movable mold to move downward when the upper mold is heated. The upper mold and the lower mold are respectively provided with a circulation structure that cools the upper mold and the lower mold when they are in the initial position.

[0005] Specifically, the temperature control drive structure includes a sliding cavity and a liquid storage cavity formed in the upper mold. The liquid storage cavity is connected to the upper part of the sliding cavity and filled with thermally expanding fluid. A movable plate is slidably connected inside the sliding cavity. The upper part of the first movable mold is fixedly connected to one side of the movable plate. Several sets of damping spring rods are fixedly connected to the upper surface of the movable plate and the inner wall of the liquid storage cavity. A first connecting structure is provided inside the movable plate. When the movable plate is in the initial position, the first connecting structure is connected to the circulation structure.

[0006] Specifically, the first movable mold includes an upper mold core groove disposed on the upper mold, an upper template is slidably connected in the upper mold core groove, the upper surface of the upper template is fixedly connected to the moving plate through a drive rod, and a first passage is provided in the upper template, the first passage being connected to a first connecting structure.

[0007] Specifically, the second movable mold includes a lower mold core groove disposed on the lower mold corresponding to the upper mold core groove, a lower template slidably connected in the lower mold core groove, the lower template corresponding to the upper template, an installation groove communicating with the lower mold core groove in the lower template, a moving block slidably connected in the installation groove, one side of the moving block being fixedly connected to one side of the lower template, and a first spring being fixedly connected between the side of the moving block away from the lower template and the inner wall of the installation groove; The moving block has a second connecting structure that is connected to the loop structure. When the moving block is in the initial position, the second connecting structure is connected to the loop structure. The lower template has a second passage that is connected to the second connecting structure.

[0008] Specifically, the first connecting structure includes a first channel disposed within the movable plate, the first channel being connected to a first passage, a first slot being provided on the side of the movable plate away from the damping spring rod, a first connecting pipe being slidably connected within the first slot, one end of the first connecting pipe being connected to a circulation structure, a first liquid inlet being provided at the end of the first connecting pipe located within the first slot, a second liquid inlet being provided within the first slot, and the first channel being connected to the first liquid inlet through the second liquid inlet.

[0009] Specifically, the second connecting structure includes a second slot provided on the movable block, a second connecting pipe slidably connected in the second slot, a third liquid inlet hole on one side of the second connecting pipe, a second channel communicating with the second passage in the movable block, a fourth liquid inlet hole in the second slot, and the second channel communicating with the third liquid inlet hole through the fourth liquid inlet hole.

[0010] Specifically, the circulation structure includes serpentine channels respectively disposed in the upper mold and the lower mold. The outer sides of the upper mold and the lower mold are provided with inlet and outlet connectors that communicate with the serpentine channels. The first connecting pipe and the second connecting pipe are respectively connected to the corresponding serpentine channels.

[0011] Specifically, the lower mold is provided with several sets of positioning holes, and a moving rod is slidably connected in the positioning holes. The lower mold is provided with several sets of moving grooves corresponding to the moving rods. The lower end of the moving rod is located in the moving groove and is fixedly connected to a connecting rod. The cavity is provided with several sets of ejection holes. The ejection holes communicate with the moving grooves. An ejector rod is slidably connected in the ejection holes. The lower end of the ejector rod is fixedly connected to one end of the connecting rod. A second spring is fixedly connected between the connecting rod and the inner wall of the moving groove, and the lower surface of the upper mold is provided with several sets of positioning rods corresponding to the positioning holes.

[0012] Specifically, the lower mold is provided with a number of first injection holes, which are distributed on the outside of the lower template. The lower template is provided with second injection holes, and injection heads can be detachably connected to both the first and second injection holes.

[0013] The beneficial effects of this invention are: The present invention discloses an injection mold for the rear shell of a daytime running light. The first movable mold and the second movable mold achieve step-by-step injection through the corresponding setting of the upper and lower templates, and precisely control the injection area. The entire dual-color headlight injection process can be completed without mold rotation, which reduces the number of mold parts, lowers mold manufacturing and maintenance costs, shortens the molding cycle of a single product, and improves overall production efficiency.

[0014] The present invention discloses an injection mold for a rear housing of a vehicle light. The upper mold positioning rod and the lower mold positioning hole cooperate to ensure the mold closing accuracy. The ejection structure, composed of the lower mold moving rod, connecting rod, ejector rod and second spring, automatically ejects the workpiece after injection molding, improving production efficiency, reducing the time cost of manual part removal, and buffering the impact force of mold opening and closing, thus extending the service life of the mold.

[0015] The present invention discloses a car light rear shell injection mold. The temperature control drive structure utilizes the thermal expansion of the fluid to drive the first movable mold to move downward. After the temperature drops, it relies on a damping spring rod to slowly reset, ensuring that the plastic is fully cured after the first injection. This effectively avoids the problem of incomplete plastic curing due to the rapid reset of the moving plate, which affects product quality and ensures product quality.

[0016] The present invention discloses an injection mold for the rear shell of a driving light. During the movement of the moving plate and the moving block, the first and second connecting structures can automatically switch their connection states with the circulating structure, which facilitates injection molding operations according to the processing flow without manual intervention, thereby improving production efficiency and automation. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is an isometric view of the present invention; Figure 2 This is an isometric view of the lower mold of the present invention; Figure 3 This is an isometric view of the upper mold of the present invention; Figure 4 This is a schematic cross-sectional view of the upper and lower molds of the present invention; Figure 5 This is a schematic diagram of the upper template structure of the present invention; Figure 6 This is a schematic diagram of the lower template structure of the present invention; Figure 7 for Figure 4 Enlarged view of region A; Figure 8 for Figure 4 Enlarged view of region B; Figure 9 for Figure 4 Enlarged view of region C; In the diagram: 1. Upper mold; 2. Lower mold; 3. Core; 4. Cavity; 5. Sliding cavity; 6. Liquid storage cavity; 7. Thermal expansion fluid; 8. Moving plate; 9. Damped spring rod; 10. Upper mold core groove; 11. Upper template; 12. Drive rod; 13. First passage; 14. Lower mold core groove; 15. Lower template; 16. Mounting groove; 17. Moving block; 18. First spring; 19. Second passage; 20. First channel; 21. First slot; 22. First connecting pipe ; 23. First liquid inlet; 24. Second liquid inlet; 25. Second slot; 26. Second connecting pipe; 27. Third liquid inlet; 28. Second channel; 29. ​​Fourth liquid inlet; 30. Serpentine channel; 31. Liquid inlet connector; 32. Liquid outlet connector; 33. Positioning hole; 34. Moving rod; 35. Moving groove; 36. Connecting rod; 37. Ejection hole; 38. Ejector rod; 39. Second spring; 40. Positioning rod; 41. First injection hole; 42. Second injection hole. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] To enable injection molding of dual-color automotive lights without rotation, shortening the molding cycle of individual products and thus improving overall production efficiency, as one embodiment of the present invention, such as... Figure 1 , Figure 2 , Figure 3 As shown, the present invention provides an injection mold for the rear shell of a driving lamp, comprising an upper mold 1 with a core 3 and a lower mold 2 with a cavity 4. The lower part of the upper mold 1 is provided with a first movable mold, and the upper part of the lower mold 2 is provided with a second movable mold corresponding to the first movable mold. The upper mold 1 is provided with a temperature control drive structure that drives the first movable mold to move downward when the upper mold 1 is heated. The upper mold 1 and the lower mold 2 are respectively provided with a circulation structure that cools the upper mold 1 and the lower mold 2 when they are in their initial positions.

[0021] During use, in the injection molding process of the dual-color car lights, the upper mold 1 is first driven to move downwards, bringing it close to the lower mold 2 until the two are completely closed. Then, the circulation structure is connected to the heat source to preheat the upper mold 1 and the lower mold 2. When the predetermined preheating temperature is reached, the temperature control drive structure is activated, driving the first movable mold to move downwards until it squeezes the second movable mold on the lower mold 2 and moves it downwards synchronously. At this time, the core 3 and cavity 4 of the mold are injected for the first time. Due to the squeezing action of the first movable mold, the area where it is located will not be injected and formed. After the injection is completed, the circulation structure switches to the cooling liquid passage to quickly cool the mold, so that the plastic injected in the first injection can be quickly solidified, completing the first injection. When the mold temperature drops, the temperature control drive structure resets, the first movable mold resets upwards and stops pressing the second movable mold, which then resets as well. At this time, the area that was not previously injected can be injected a second time. After the injection is completed, the cooling liquid is introduced again using the circulation structure to reduce the temperature of the mold and the movable mold and accelerate the curing of the plastic. After the plastic injected a second time has completely cured, the upper mold 1 and the lower mold 2 are driven to separate, and the molded product is taken out, completing the production of the dual-color car light rear shell. This invention enables the molding of dual-color automotive lights without mold rotation, reducing the number of mold parts and avoiding problems such as gaps and misalignments in the dual-color materials caused by inaccurate rotation positioning. At the same time, this method shortens the molding cycle of a single product and significantly improves overall production efficiency.

[0022] To facilitate the first injection molding, for example, such as Figure 3 , Figure 4 , Figure 5 , Figure 7 As shown, the present invention further includes a temperature control drive structure comprising a sliding cavity 5 and a liquid storage cavity 6 formed within the upper mold 1. The liquid storage cavity 6 is connected to the upper part of the sliding cavity 5 and filled with a thermally expanding fluid 7. A movable plate 8 is slidably connected within the sliding cavity 5. The upper part of the first movable mold is fixedly connected to one side of the movable plate 8. A plurality of damping spring rods 9 are fixedly connected to the upper surface of the movable plate 8 and the inner wall of the liquid storage cavity 6. A first connecting structure is provided within the movable plate 8. When the movable plate 8 is in the initial position, the first connecting structure is connected to the circulation structure.

[0023] In use, during the dual-color headlight injection molding process, the upper mold 1 is first driven to move towards the lower mold 2 until the two are completely closed. Then, the circulation structure is connected to the heat source. The heat generated by the heat source is conducted to the moving plate 8 through the circulation structure and the first connecting structure, thereby gradually increasing the temperature of the moving plate 8, the liquid storage chamber 6, the sliding chamber 5, and the core 3, completing the preheating process. When the temperature in the liquid storage chamber 6 rises to a specific value, the thermal expansion fluid 7 expands due to heat, generating a squeezing force on the moving plate 8, causing the moving plate 8 to move downward. As the moving plate 8 moves downward, it drives the first movable mold to move downward synchronously. After the first movable mold moves downward and squeezes the second movable mold to move downward, the first injection molding can be performed. As the moving plate 8 continues to move downward to a certain position, the first connecting structure will disconnect from the circulation structure.

[0024] After the first injection molding is completed, the circulation structure is switched to connect to the cooling liquid. The cooling liquid is used to cool and lower the temperature of the entire upper mold 1 and lower mold 2. When the temperature of the upper mold 1 decreases, the thermal expansion fluid 7 stops expanding. At this time, the damping spring rod 9 plays a role in slow reset, driving the first movable mold to gradually reset upward to the initial state. Relying on the slow reset characteristic of the damping spring rod 9, it can ensure that the plastic is fully cured after the first injection molding is completed. This effectively avoids the problem of the plastic not being fully cured due to the rapid reset of the moving plate 8, which affects the product quality and further ensures the quality of the product.

[0025] To facilitate a second injection molding, for example, such as Figure 1 , Figure 3 , Figure 4 , Figure 6 As shown, the present invention further includes the first movable mold including an upper mold core groove 10 disposed on the upper mold 1, an upper template 11 slidably connected in the upper mold core groove 10, the upper surface of the upper template 11 being fixedly connected to the moving plate 8 via a drive rod 12, and a first passage 13 provided in the upper template 11, the first passage 13 being connected to a first connecting structure.

[0026] In use, during the initial stage of dual-color headlight injection molding, the circulation structure is connected to the heat source. Heat enters the moving plate 8 sequentially through the circulation structure and the first connecting structure. At the same time, with the help of the conduction effect of the first passage 13, the temperature of the upper mold plate 11 rises rapidly, thereby driving the overall temperature of the upper mold 1 and the lower mold 2 to rise quickly, thus completing the preheating process. When the thermal expansion fluid 7 in the liquid storage chamber 6 expands due to heat and pushes the moving plate 8 downward, the moving plate 8 drives the upper mold plate 11 to slide downward through the drive rod 12. After the upper mold plate 11 squeezes the second movable mold on the lower mold 2 downward, the first injection molding can be performed. As the upper mold plate 11 moves downward to a specific position, the first passage 13 is disconnected from the first connecting structure. After the first injection molding is completed, the circulation structure is switched to connect with the cooling liquid. The cooling liquid is used to cool and lower the temperature of the entire upper mold 1 and lower mold 2. The thermally expanding fluid 7 contracts, and the damping spring rod 9 takes effect, driving the moving plate 8, drive rod 12, and upper template 11 to gradually return to the initial state. At this time, the first passage 13 is connected to the first connecting structure again, and the second injection molding can be performed. After the second injection molding is completed, the circulation structure is connected to the cooling liquid. The cooling liquid passes through the circulation structure, the first connecting structure, and the first passage 13 in sequence, quickly reducing the temperature of the upper mold 1 and causing the plastic injected in the second injection to solidify rapidly. After the plastic is completely solidified, the upper mold 1 and lower mold 2 are separated, and the solidified product is taken out, thus completing the production of the dual-color car light housing. The entire production process can be completed without mold rotation, which not only simplifies the process flow but also significantly shortens the molding cycle of a single product and effectively improves the overall production efficiency.

[0027] For ease of production, exemplarily, such as Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 8 As shown, the present invention further includes the second movable mold including a lower mold core groove 14 disposed on the lower mold 2 corresponding to the upper mold core groove 10, a lower template 15 slidably connected in the lower mold core groove 14, the lower template 15 corresponding to the upper template 11, an installation groove 16 communicating with the lower mold core groove 14 in the lower template 15, a moving block 17 slidably connected in the installation groove 16, one side of the moving block 17 being fixedly connected to one side of the lower template 15, and a first spring 18 being fixedly connected between the side of the moving block 17 away from the lower template 15 and the inner wall of the installation groove 16; The movable block 17 is provided with a second connecting structure that is connected to the loop structure. When the movable block 17 is in the initial position, the second connecting structure is connected to the loop structure. The lower template 15 is provided with a second passage 19, which is connected to the second connecting structure.

[0028] During use, in the injection molding process of dual-color car lights, the circulation structure is first connected to the heat source. The heat will then be quickly transferred to the lower mold 2 and the lower template 15 through the circulation structure, the second connecting structure, and the second passage 19, achieving overall preheating and making full preparation for the subsequent first injection molding operation. When the thermal expansion fluid 7 in the liquid storage cavity 6 is heated and expands, it drives the moving plate 8 and the upper template 11 to move downward. During the downward movement of the upper template 11, it will squeeze the lower template 15, causing it to move downward synchronously. While sliding downward, the lower template 15 maintains a sliding connection with the lower mold core groove 14 and drives the moving block 17 to move downward together. When the moving block 17 moves downward, it will squeeze the first spring 18 to store force. At the same time, the second connecting structure is disconnected from the circulation structure, and the first injection molding operation can be performed. After the first injection molding is completed, the circulation structure is connected to the cooling liquid. The cooling liquid is used to cool the entire lower mold 2 through the circulation structure, which promotes the rapid solidification of the plastic after the first injection molding. At this time, the thermal expansion fluid 7 contracts, and the damping spring rod 9 plays its role, driving the moving plate 8 and the upper mold plate 11 to return to their original position. At the same time, the first spring 18 also plays its role in resetting, driving the lower mold plate 15 to move upward and return it to its initial state. At this time, the second connecting structure is connected to the circulation structure again, and the corresponding areas of the upper mold plate 11 and the lower mold plate 15 can be injected for the second injection molding operation. After the second injection molding is completed, the circulation structure is connected to the cooling liquid again. The cooling liquid passes through the circulation structure, the second connecting structure and the second passage 19 in sequence, which quickly reduces the temperature of the lower mold 2 and the lower mold plate 15, so that the plastic after the second injection molding is rapidly solidified, which improves the convenience of the production process.

[0029] For example, such as Figure 3 , Figure 4 , Figure 5 , Figure 7 As shown, the present invention further includes the following: the first connecting structure includes a first channel 20 disposed within the movable plate 8, the first channel 20 being connected to the first passage 13; the movable plate 8 having a first slot 21 on the side away from the damping spring rod 9; a first connecting pipe 22 being slidably connected within the first slot 21; one end of the first connecting pipe 22 being connected to the circulation structure; a first liquid inlet hole 23 being provided at the end of the first connecting pipe 22 located within the first slot 21; a second liquid inlet hole 24 being provided within the first slot 21; and the first channel 20 being connected to the first liquid inlet hole 23 via the second liquid inlet hole 24.

[0030] In use, during the dual-color headlight injection molding process, the circulation structure is connected to the heat source in the initial stage. The heat generated by the heat source flows into the first channel 20 through the first connecting pipe 22, the first liquid inlet hole 23, and the second liquid inlet hole 24. Since the first channel 20 is connected to the first passage 13 of the upper mold plate 11, the heat can be transferred quickly, thereby achieving efficient preheating of the entire upper mold 1 and successfully completing the preheating process of the upper mold 1. When the specific preheating temperature is reached, the thermal expansion fluid 7 in the liquid storage chamber 6 expands due to heat, pushing the moving plate 8 to drive the drive rod 12 and the upper mold plate 11 to move downward together. As the moving plate 8 moves downward, the first liquid inlet hole 23 and the second liquid inlet hole 24 gradually become misaligned and no longer connected. At this time, the first injection molding operation can be carried out. After the first injection molding is completed, the circulation structure is switched to connect to the cooling liquid. The cooling liquid cools the upper mold 1 through the circulation structure. After cooling is completed, the damping spring rod 9 takes effect, driving the upper mold plate 11 to return to its initial state. At the same time, the first connecting pipe 22 also returns to its initial position during the resetting process of the moving plate 8, so that the first liquid inlet hole 23 is connected to the second liquid inlet hole 24 again. At this time, the second injection molding operation can be performed. After the second injection molding is completed, the circulation structure is connected to the cooling liquid again. The cooling liquid passes through the circulation structure, the first connecting pipe 22, the first liquid inlet hole 23, the second liquid inlet hole 24, and the first passage 13 in sequence, which cools the upper mold 1 in all directions and rapidly, speeding up the plastic curing speed after the second injection molding, significantly improving production convenience, effectively shortening the production cycle, and improving overall production efficiency.

[0031] For example, such as Figure 2 , Figure 4 , Figure 8 As shown, the present invention further includes the following: the second communication structure includes a second slot 25 disposed on the movable block 17; a second communication pipe 26 is slidably connected in the second slot 25; a third liquid inlet hole 27 is provided on one side of the second communication pipe 26; a second channel 28 communicating with the second passage 19 is provided in the movable block 17; a fourth liquid inlet hole 29 is provided in the second slot 25; and the second channel 28 is connected to the third liquid inlet hole 27 through the fourth liquid inlet hole 29.

[0032] During use, the heat source is connected by a circulation structure. The heat source enters the second channel 28 through the second connecting pipe 26, the third liquid inlet hole 27, and the fourth liquid inlet hole 29, which facilitates rapid preheating of the lower mold 2 as a whole. When the upper mold plate 11 moves down to squeeze the lower mold plate 15 and the moving block 17 moves down, the third liquid inlet hole 27 is no longer connected to the fourth liquid inlet hole 29. This facilitates automatic switching of the connection between the third liquid inlet hole 27 and the fourth liquid inlet hole 29 according to the processing flow, thereby improving the overall production efficiency of the dual-color headlights.

[0033] For example, such as Figure 4, Figure 7 , Figure 8 As shown, the present invention also includes the following: the circulation structure includes serpentine channels 30 respectively disposed in the upper mold 1 and the lower mold 2; the outer sides of the upper mold 1 and the lower mold 2 are provided with liquid inlet connectors 31 and liquid outlet connectors 32 communicating with the serpentine channels 30; and the first connecting pipe 22 and the second connecting pipe 26 are respectively connected with the corresponding serpentine channels 30.

[0034] When the mold needs to be preheated, the heat source medium flows into the serpentine channel 30 through the liquid inlet connector 31 to preheat the upper mold 1 and the lower mold 2 evenly. When the mold needs to be cooled, the cooling liquid can also smoothly enter the serpentine channel 30 through the liquid inlet connector 31 to quickly remove the heat generated during the operation of the mold. At the same time, the liquid outlet connector 32 ensures the smoothness of the entire circulation system and can discharge the heat source medium or cooling liquid that has completed heat exchange in the serpentine channel 30 in a timely manner, thereby forming an efficient liquid circulation.

[0035] For example, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 9 As shown, the present invention further includes: a plurality of positioning holes 33 provided in the lower mold 2; a moving rod 34 slidably connected in the positioning holes 33; a plurality of moving grooves 35 corresponding to the moving rods 34 provided in the lower mold 2; the lower end of the moving rod 34 located in the moving groove 35 and fixedly connected to a connecting rod 36; a plurality of ejection holes 37 provided in the cavity 4; the ejection holes 37 communicating with the moving grooves 35; an ejector rod 38 slidably connected in the ejection holes 37; and the lower end of the ejector rod 38 fixedly connected to one end of the connecting rod 36. A second spring 39 is fixedly connected between the connecting rod 36 and the inner wall of the moving groove 35, and the lower surface of the upper mold 1 is provided with a number of positioning rods 40 corresponding to the positioning holes 33.

[0036] When in use, as the upper mold 1 moves downward, the positioning rod 40 on the lower surface of the upper mold 1 aligns with the positioning hole 33 of the lower mold 2 and is inserted. As the upper mold 1 continues to descend, the positioning rod 40 pushes the moving rod 34 to slide downward in the positioning hole 33. The moving rod 34 drives the connecting rod 36 to move downward in the moving groove 35. The connecting rod 36 drives the ejector rod 38 to move downward. At the same time, as the connecting rod 36 moves downward, it compresses the second spring 39 to store force. When the upper mold 1 continues to descend until it is completely closed with the lower mold 2, the ejector rod 38 is completely located in the ejection hole 37. At this time, the injection molding operation of the mold can begin. After the injection molding is completed, the upper mold 1 is driven to move upward and separate from the lower mold 2. The positioning rod 40 is pulled out from the positioning hole 33. The moving rod 34 moves upward under the elastic force of the second spring 39, which drives the connecting rod 36 to move upward. When the connecting rod 36 moves upward, it drives the ejector rod 38 to slide upward in the ejection hole 37. The ejector rod 38 ejects the injection-molded workpiece from the mold cavity 4, which makes it easier for the operator to take out the workpiece, improves production efficiency, and reduces the time cost of manual part removal. Meanwhile, the sliding connection between the moving rod 34 and the positioning hole 33, as well as the cooperation between the connecting rod 36 and the moving groove 35, and the ejector rod 38 and the ejection hole 37, ensure that the entire mold structure remains stable during operation.

[0037] For example, such as Figure 2 As shown, the present invention also includes a plurality of first injection holes 41 provided in the lower mold 2, the plurality of first injection holes 41 being distributed on the outer side of the lower template 15, and a second injection hole 42 provided on the lower template 15, wherein injection heads can be detachably connected to both the first injection hole 41 and the second injection hole 42.

[0038] In use, during the injection molding process, after the upper mold 1 and the lower mold 2 are precisely closed and the preheating process is completed, the upper mold plate 11 moves downward and tightly squeezes the lower mold plate 15. At this time, several sets of first injection holes 41 distributed on the outside of the lower mold plate 15, together with the detachable injection head, perform the first injection molding of the core 3 and the cavity 4. After the first injection molding is completed, the upper mold plate 11 and the lower mold plate 15 are reset to their initial state. Then, with the help of the second injection hole 42 on the lower mold plate 15 and the corresponding injection head, the area enclosed by the upper mold plate 11 and the lower mold plate 15 is injected a second time. This step-by-step injection molding method has successfully achieved efficient and precise injection molding production of dual-color car lights, improving product quality and production efficiency.

[0039] When in use, the upper mold 1 is driven to move downwards, bringing it close to the lower mold 2, until the positioning rod 40 on the lower surface of the upper mold 1 is aligned with the positioning hole 33 of the lower mold 2 and inserted. As the upper mold 1 continues to descend, the positioning rod 40 pushes the moving rod 34 to slide downwards in the positioning hole 33. The moving rod 34 drives the connecting rod 36 to move downwards in the moving groove 35. The connecting rod 36 drives the ejector rod 38 to move downwards. At the same time, as the connecting rod 36 moves downwards, it compresses the second spring 39 to store force. When the upper mold 1 continues to descend until it is completely closed with the lower mold 2, the ejector rod 38 is completely located in the ejection hole 37. The circulation structure is connected to the heat source. The heat source medium flows into the serpentine channel 30 in the upper mold 1 and the lower mold 2 through the liquid inlet connector 31, and preheats the upper mold 1 and the lower mold 2 evenly. The heat is conducted to the moving plate 8 through the circulation structure and the first connecting structure, thereby gradually increasing the temperature of the moving plate 8, the liquid storage chamber 6, the sliding chamber 5 and the core 3. At the same time, the heat is quickly transferred to the lower mold 2 and the lower template 15 through the circulation structure, the second connecting structure and the second passage 19, completing the preheating process of the entire mold. When the temperature in the liquid storage chamber 6 rises to a specific value, the thermally expanding fluid 7 expands due to heat, generating a squeezing force on the moving plate 8, causing the moving plate 8 to move downward. The moving plate 8 drives the upper template 11 to slide downward through the drive rod 12. The upper template 11 squeezes the lower template 15 on the lower mold 2, causing it to move downward synchronously. The lower template 15 drives the moving block 17 to move downward together. The moving block 17 moves downward and squeezes the first spring 18 to store force. At the same time, the first connecting structure is disconnected from the circulation structure, and the second connecting structure is disconnected from the circulation structure. At this time, several sets of first injection holes 41 distributed on the outside of the lower template 15, together with the detachable injection head, perform the first injection molding of the core 3 and the cavity 4. After the first injection is completed, the circulation structure is switched to connect to the cooling liquid. The cooling liquid cools the upper mold 1 and the lower mold 2 through the circulation structure, which promotes the rapid solidification of the plastic after the first injection. When the temperature of the upper mold 1 decreases, the thermal expansion fluid 7 stops expanding, and the damping spring rod 9 plays a role in slow reset, driving the moving plate 8, the drive rod 12 and the upper mold plate 11 to gradually reset upward to the initial state. At the same time, the first spring 18 also plays a reset role, driving the lower mold plate 15 to move upward and return it to the initial state. After the upper template 11 and the lower template 15 are reset, the first connecting structure is connected to the loop structure again, and the second connecting structure is connected to the loop structure again. With the help of the second injection hole 42 on the lower template 15 and the corresponding injection head, the area enclosed by the upper template 11 and the lower template 15 is injected a second time. After the second injection is completed, the circulation structure is connected to the cooling liquid again. The cooling liquid passes through the circulation structure, the first connecting structure and the first passage 13 in sequence to quickly reduce the temperature of the upper mold 1. The cooling liquid passes through the circulation structure, the second connecting structure and the second passage 19 in sequence to quickly reduce the temperature of the lower mold 2 and the lower template 15, so that the plastic completed by the second injection is quickly solidified. After the plastic from the second injection has completely solidified, the upper mold 1 is driven to move upward and separate from the lower mold 2. The positioning rod 40 is pulled out from the positioning hole 33, and the moving rod 34 moves upward under the elastic force of the second spring 39, which drives the connecting rod 36 to move upward. When the connecting rod 36 moves upward, it drives the ejector rod 38 to slide upward in the ejection hole 37. The ejector rod 38 ejects the pressed dual-color car light rear shell from the mold cavity 4, making it easy for the operator to remove the workpiece.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection mold for the rear housing of a driving light, characterized in that, The upper mold (1) includes a core (3) and a lower mold (2) includes a cavity (4). The lower part of the upper mold (1) is provided with a first movable mold, and the upper part of the lower mold (2) is provided with a second movable mold corresponding to the first movable mold. The upper mold (1) is provided with a temperature control drive structure that drives the first movable mold to move downward when the upper mold (1) is heated. The upper mold (1) and the lower mold (2) are respectively provided with a circulation structure that cools the upper mold (1) and the lower mold (2) when they are in the initial position.

2. The injection mold for the rear housing of a driving lamp according to claim 1, characterized in that, The temperature control drive structure includes a sliding cavity (5) and a liquid storage cavity (6) opened in the upper mold (1). The liquid storage cavity (6) is connected to the upper part of the sliding cavity (5) and filled with thermal expansion fluid (7). A movable plate (8) is sealed and slidably connected in the sliding cavity (5). The upper part of the first movable mold is fixedly connected to one side of the movable plate (8). Several sets of damping spring rods (9) are fixedly connected to the upper surface of the movable plate (8) and the inner wall of the liquid storage cavity (6). A first connecting structure is provided in the movable plate (8). In the initial state, the first connecting structure is connected to the circulation structure.

3. The injection mold for the rear housing of a driving light according to claim 2, characterized in that, The first movable mold includes an upper mold core groove (10) disposed on the upper mold (1), an upper template (11) is slidably connected in the upper mold core groove (10), the upper surface of the upper template (11) is fixedly connected to the moving plate (8) through a drive rod (12), and a first passage (13) is provided in the upper template (11), the first passage (13) is connected to the first connecting structure.

4. The injection mold for the rear housing of a driving lamp according to claim 3, characterized in that, The second movable mold includes a lower mold core groove (14) on the lower mold (2) corresponding to the upper mold core groove (10). A lower template (15) is slidably connected in the lower mold core groove (14). The lower template (15) corresponds to the upper template (11). The lower template (15) is provided with an installation groove (16) communicating with the lower mold core groove (14). A moving block (17) is slidably connected in the installation groove (16). One side of the moving block (17) is fixedly connected to one side of the lower template (15). A first spring (18) is fixedly connected between the side of the moving block (17) away from the lower template (15) and the inner wall of the installation groove (16). The movable block (17) is provided with a second connecting structure that is connected to the loop structure. In the initial state, the second connecting structure of the movable block (17) is connected to the loop structure. The lower template (15) is provided with a second passage (19) that is connected to the second connecting structure.

5. The injection mold for the rear housing of a driving lamp according to claim 4, characterized in that, The first connecting structure includes a first channel (20) disposed in the movable plate (8), the first channel (20) being connected to the first passage (13), the movable plate (8) having a first slot (21) on the side away from the damping spring rod (9), a first connecting pipe (22) being slidably connected in the first slot (21), one end of the first connecting pipe (22) being connected to the circulation structure, a first liquid inlet hole (23) being provided at one end of the first connecting pipe (22) located in the first slot (21), a second liquid inlet hole (24) being provided in the first slot (21), and the first channel (20) being connected to the first liquid inlet hole (23) through the second liquid inlet hole (24).

6. The injection mold for the rear housing of a driving lamp according to claim 5, characterized in that, The second communication structure includes a second slot (25) provided on the movable block (17), a second communication pipe (26) slidably connected in the second slot (25), a third liquid inlet hole (27) provided on one side of the second communication pipe (26), a second channel (28) communicating with the second passage (19) provided in the movable block (17), a fourth liquid inlet hole (29) provided in the second slot (25), and the second channel (28) communicating with the third liquid inlet hole (27) through the fourth liquid inlet hole (29).

7. The injection mold for the rear housing of a driving light according to claim 6, characterized in that, The circulation structure includes serpentine channels (30) respectively set in the upper mold (1) and the lower mold (2). The upper mold (1) and the lower mold (2) are provided with liquid inlet connector (31) and liquid outlet connector (32) communicating with the serpentine channels (30) on their outer sides. The first connecting pipe (22) and the second connecting pipe (26) are respectively connected to the corresponding serpentine channels (30).

8. The injection mold for the rear housing of a driving light according to claim 7, characterized in that, The lower mold (2) is provided with several sets of positioning holes (33), and a moving rod (34) is slidably connected in the positioning holes (33). The lower mold (2) is provided with several sets of moving grooves (35) corresponding to the moving rods (34). The lower end of the moving rod (34) is located in the moving groove (35) and is fixedly connected to a connecting rod (36). The cavity (4) is provided with several sets of ejection holes (37). The ejection holes (37) communicate with the moving grooves (35). An ejector rod (38) is slidably connected in the ejection holes (37). The lower end of the ejector rod (38) is fixedly connected to one end of the connecting rod (36). A second spring (39) is fixedly connected between the connecting rod (36) and the inner wall of the moving groove (35), and the lower surface of the upper mold (1) is provided with a number of positioning rods (40) corresponding to the positioning holes (33).

9. The injection mold for the rear housing of a driving lamp according to claim 8, characterized in that, The lower mold (2) is provided with a number of first injection holes (41), and the number of first injection holes (41) are distributed on the outside of the lower template (15). The lower template (15) is provided with second injection holes (42), and injection heads can be detachably connected to both the first injection holes (41) and the second injection holes (42).

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