Automobile lamp thick-wall part injection molding mold and flexible demolding method thereof

Abstract

The application relates to the technical field of automobile part production, and discloses an automobile lamp thick-wall part injection molding mold and a flexible demolding method thereof, which comprises a bottom plate and a lower mold base arranged at the middle part of the top of the bottom plate, and further comprises demolding holes arranged on the left and right sides of the bottom of the inner wall of a mold cavity above the lower mold base. The automatic switching of the plugging and air injection functions can reliably close the mold cavity in the injection stage, guarantees the integrity of the optical surface and appearance quality of the automobile lamp thick-wall part, clean air filtered by heating is injected into the mold cavity during the demolding process, and a significant temperature difference effect is formed by cooperating with mold cooling, so that thermal expansion and cold shrinkage gaps are generated between the workpiece and the mold, the gas can form a uniform air film in the gaps, the demolding resistance of the thick-wall part is effectively reduced, the surface quality and optical performance of the workpiece are obviously improved, and the mold also has an auxiliary knocking demolding treatment. The flexible knocking makes the workpiece and the mold cavity interface locally separate, the demolding force distribution is more uniform, and the workpiece is quickly demolded.

Description

Technical Field

[0001] This invention relates to the field of automotive component manufacturing technology, specifically to an injection molding die for thick-walled automotive headlight components and its flexible demolding method. Background Technology

[0002] Thick-walled components of automotive headlights are key optical components of automotive lighting systems, encompassing categories such as thick-walled light guides and thick-walled light distribution lenses. They combine the functions of light transmission, beam distribution, and aesthetic decoration, and are important components that determine the lighting performance of headlights and the visual quality of the overall vehicle styling. Injection molding is the mainstream manufacturing process for thick-walled components of headlights. They are mostly made of transparent optical resins such as polycarbonate and polymethyl methacrylate. Molten optical resin is injected into the cavity using a precision molding mold, and after pressure holding and cooling, thick-walled plastic parts with specific optical curved surfaces are obtained.

[0003] Currently, in the injection molding process of automotive headlights, existing injection molds often employ flexible demolding to avoid damage to thick-walled headlight components. However, current injection molds rely solely on gas injection for flexible demolding. During injection, the gas injection holes inside the mold cavity can easily enter the melt. After cooling, protrusions with the same shape as the gas holes form on the surface of the part, damaging the optical surface and appearance quality of the thick-walled headlight component, affecting dimensional accuracy and surface flatness. Moreover, gas is difficult to penetrate in the initial stage of gas injection. The thick-walled headlight component experiences significant cooling shrinkage, and the plastic part is tightly bonded to the core interface. Simultaneously subjected to the dual effects of strong vacuum adsorption and large radial clamping force, the interface lacks an initial gap, making it difficult for gas to enter the bonding surface. Gas pressure cannot be established, and the demolding process is difficult to initiate. Summary of the Invention

[0004] The purpose of this invention is to provide an injection molding die for thick-walled automotive headlight parts and a flexible demolding method thereof, so as to solve the problems of traditional injection molding dies mentioned in the background art.

[0005] This invention provides the following technical solution: an injection molding mold for thick-walled automotive headlight parts, comprising a base plate and a lower mold base disposed in the middle above the base plate, and further comprising:

[0006] Demolding holes are provided on the left and right sides of the bottom of the inner wall of the mold cavity above the lower mold base. A lifting plate is provided on the top of the base plate and below the lower mold base. Lifting structures are fixed on both the left and right sides of the lifting plate.

[0007] Fixed slots are provided on the left and right sides of the lifting plate. A shifting structure is also provided at the bottom of the lifting plate. A shifting plate is rotatably connected inside the fixed slot. A blocking block is provided on the side of the top of the shifting plate near the center of the lifting plate. The blocking block penetrates into the demolding hole and slides in connection with the inner wall of the demolding hole. An air injection pipe is provided on the top of the shifting plate and on the side away from the blocking block. An air injection structure is installed on the front side of the top of the bottom plate.

[0008] Support plates are bolted to the top left and right sides of the base plate. A top plate is bolted to the top of the support plate. Hydraulic rods are provided on the front and rear sides of the bottom of the top plate. An upper mold base is fixed to the bottom end of the hydraulic rod output shaft. An injection nozzle is connected to the middle of the top of the upper mold base. Cooling structures are provided on the left and right sides of the top of the upper mold base. Mounting grooves are provided on the upper rear side of the support plate. An indexing structure is provided on the upper side of the opposite side of the support plate.

[0009] A connecting plate is rotatably connected inside the mounting groove. The rear side of the connecting plate extends to the rear of the support plate. A mounting plate is bolted to the back of the connecting plate. A striking structure is movably connected to the surface of the mounting plate. Protective sleeves are bolted to both sides of the lower mold base. The top of the air injection pipe extends into the interior of the protective sleeve and slides in connection with the inner wall of the protective sleeve.

[0010] As a preferred technical solution, the lifting structure includes double-headed cylinders on the left and right sides of the top of the base plate, and sliders slidably connected to the left and right sides of the top of the base plate and in front and behind the double-headed cylinders. The output shafts on the front and rear sides of the double-headed cylinders are fixedly connected to the surface of the slider on the opposite side. A support rod is hinged to the top of the slider. Fixed blocks are connected to the left and right sides of the lifting plate. The top of the support rod is hinged to the front and rear sides of the fixed block.

[0011] As a preferred technical solution, the top surface of the base plate is provided with limiting grooves on both the left and right sides of the slider, and rollers are rotatably connected to both sides of the slider. The rollers extend below into the interior of the limiting grooves and roll to the inner wall of the limiting grooves.

[0012] As a preferred technical solution, the transposition structure includes a mini cylinder, a connecting plate, a first gear, a rack plate, a guide groove, and a guide ring. The mini cylinder is bolted to the middle of the bottom of the lifting plate. The connecting plate is slidably connected to the rear side of the bottom of the lifting plate. The rear end of the output shaft of the mini cylinder is connected to the front side of the connecting plate. The first gear is connected to the middle of the bottom of the transposition plate. The rack plate is located on the left and right sides of the front of the connecting plate. The rack plates on both sides mesh with the first gears on the left and right sides. The guide groove is opened on the surface of the inner wall of the fixed groove. The inner wall of the guide groove is annular. The guide ring is located in the middle of the surface of the transposition plate. The guide ring is located inside the guide groove and is slidably connected to the inner wall of the guide groove.

[0013] As a preferred technical solution, the air injection structure includes an air pump located in the middle of the front side of the top of the base plate. A heating filter box is also provided on the top of the base plate. The heating filter box is connected to the air pump. An air extraction pipe is connected to the rear side of the heating filter box. A filter element is provided on the rear side of the inner wall of the heating filter box. A heating wire is installed on the front side of the inner wall of the heating filter box. A connecting pipe is also connected to the top of the air pump. The connecting pipe is T-shaped. The two ends of the top of the connecting pipe are connected to the air injection pipe. The connecting pipe is a retractable flexible hose.

[0014] As a preferred technical solution, the cooling structure includes water tanks located on the front and rear sides of the top of the upper mold base. A circulation pump is installed between the front and rear water tanks and is connected to the front and rear water tanks. The water tanks are filled with coolant. Several heat-conducting plates are installed through the top of the water tanks. The heat-conducting plates extend into the interior of the water tanks. A heat-conducting fan is installed on the top of the heat-conducting plates. A liquid-passing pipe is connected to one side of the front and rear water tanks and passes through the upper mold base. A control valve is also connected to one side of the water tank.

[0015] As a preferred technical solution, the indexing structure includes a drive motor fixed above the opposite side of the support plate, a second gear fixedly connected to the output shaft of the drive motor, a third gear rotatably connected to the front side of the bottom of the mounting groove, and the front side of the bottom of the connecting plate fixedly connected to the top of the third gear.

[0016] As a preferred technical solution, the striking structure includes a motor, a rotating disk, a push-pull rod, a guide rail, a guide block, a lifting frame, a mounting rod, and a rubber striking block. The motor is fixed above the opposite side of the mounting plate, the rotating disk is rotatably connected above the opposite side of the mounting plate, the output shaft of the motor passes through the mounting plate and is connected to the rotating disk, the push-pull rod is rotatably connected to the surface of the opposite side of the rotating disk, the guide rail is set on the surface of the opposite side of the mounting plate and located below the rotating disk, the guide block is sleeved in the middle of the guide rail surface, and the guide block is slidably connected to the guide rail, the lifting frame is set on the surface of the opposite side of the guide block, the mounting rod is bolted to the bottom of the lifting frame, the bottom end of the push-pull rod is rotatably connected to the surface of one side of the lifting frame, and the rubber striking block is set at the bottom of the mounting rod.

[0017] As a preferred technical solution, electric push rods are provided on the surface of the support plate facing each other and below the mounting groove, and positioning holes are provided on the rear side of the bottom of the connecting plate. The output shaft of the electric push rod is slidably connected to the inner wall of the positioning hole.

[0018] A flexible demolding method for injection molding molds of thick-walled automotive headlight parts, specifically including the following steps:

[0019] A: When this injection molding mold is working, the hydraulic rods on the front and rear sides of the bottom of the top plate first push the upper mold base downward, so that the upper mold base and the lower mold base are closed. At this time, the lifting plate is in the rising state. The sealing blocks on the left and right shifting plates of the lifting plate are inserted into the demolding holes on the left and right sides of the bottom of the inner wall of the lower mold base cavity to reliably seal the demolding holes and prevent the molten material from leaking during injection. At the same time, the top of the air injection pipe is located inside the protective sleeve to prevent the air injection hole from being contaminated and blocked by external dust or impurities. After the mold is closed, the molten thick-walled part of the car headlight is injected into the cavity formed by the lower mold base and the upper mold base through the injection nozzle in the middle of the top of the upper mold base for filling, holding pressure and cooling molding. During the injection molding process, the lifting structure at the bottom of the lower mold base keeps the sealing blocks in the demolding hole state. The double-headed cylinder does not move. The sliders on the front and rear sides are located in the limit groove. The rollers roll with the limit groove to ensure the stability of the lifting plate position.

[0020] B: After the thick-walled part of the headlight cools and solidifies in the mold cavity, the hydraulic rod drives the upper mold base to rise and open the mold. At this time, the double-headed cylinders on the left and right sides need to be activated so that the output shafts on the front and rear sides of the double-headed cylinders push out synchronously, pushing the sliders on the front and rear sides away from each other along the limit groove. The rollers on the sliders roll in the limit groove to ensure smooth movement. The slider drives the hinged support rod to move, and the support rod pulls the fixed block and the lifting plate down as a whole, so that the sealing block is moved out of the demolding hole. Then the mini cylinder is activated, and the output shaft of the mini cylinder retracts, driving the connecting piece As the connecting plate moves backward, the rack plates on the left and right sides of the front side move forward as well. The rack plates drive the first gear meshing with them to rotate. The first gear drives the shifting plate to rotate in the fixed groove. The guide ring slides along the guide groove to ensure stable rotation, thereby switching the position of the sealing block on the top of the shifting plate and the air injection pipe, so that the air injection pipe is aligned with the demolding hole. After the position switching is completed, the double-headed cylinder is started again to retract the output shaft, the sliders move towards each other, and the support rod pushes the fixed block and the lifting plate to rise, driving the air injection pipe into the demolding hole, completing the preparation before air injection.

[0021] C: After the air injection pipe is in place, first start the circulation pump to circulate the coolant in the water tank through the liquid flow pipe, which runs through the interior of the upper mold base, carrying away the heat from the upper mold base. Simultaneously, the cooling fan rotates, dissipating the heat absorbed by the coolant in the water tank into the air through the heat conduction plate, thus cooling the upper mold base and mold cavity, causing the core or cavity to contract. Then, start the heating wire in the heating filter box. After the air pump starts, air enters through the extraction pipe at the rear of the heating filter box, first being filtered by the filter element to remove impurities, and then heated by the heating wire to become clean hot air. The hot air is then delivered to the air injection pipe through the connecting pipe. Because the connecting pipe is a flexible hose, it can adapt to changes in the position of the air injection pipe. Finally, the hot air enters from the top of the air injection pipe at the interface between the mold cavity and the workpiece, heating the inner surface of the workpiece to cause it to expand, thus forming a mold shape after cooling. A temperature difference gap is formed, and hot air forms an air film in the gap, achieving initial separation for flexible demolding. At the same time, the drive motor is started, which drives the second gear to rotate. The second gear drives the third gear to rotate, causing the connecting plate to rotate 90 degrees in the mounting slot. The mounting plate drives the striking structure to rotate to the top of the upper mold base. Then, the output shaft of the electric push rod extends and inserts into the positioning hole at the bottom of the connecting plate to lock the connecting plate. Then, the motor starts and drives the rotating disk to rotate. The rotating disk pulls the guide block to slide up and down along the guide rail through the push-pull rod. The guide block drives the lifting frame and the mounting rod to move up and down, so that the rubber striking block slightly taps the left and right sides of the top of the upper mold base, causing local separation between the thick-walled part and the mold cavity interface, reducing the adhesion force, and helping the hot air to enter the interface more smoothly, thus enhancing the flexible demolding effect.

[0022] D: Under the combined action of the cooling structure cooling the mold, the air injection structure injecting hot air to form an air film, and the striking structure applying mechanical vibration, a uniform gap is formed between the thick-walled part of the car headlight and the mold cavity interface. The part is lifted out of the mold cavity with low stress under the action of air film and micro-vibration, completing the flexible demolding. After demolding, the air injection structure stops supplying air, the cooling structure stops working, the striking structure stops striking, the electric push rod output shaft retracts, the indexing structure rotates in the opposite direction to make the striking structure rotate back to the rear side of the support plate, and then the double-headed cylinder acts again to make the lifting plate descend, the air injection pipe exits the demolding hole, the repositioning structure works in the opposite direction to make the repositioning plate rotate, and the sealing block is re-aligned with the demolding hole. The double-headed cylinder pushes the lifting plate up, the sealing block is inserted into the demolding hole again to seal, and the top of the air injection pipe returns to the protective sleeve for protection.

[0023] The present invention has the following beneficial effects:

[0024] This invention reliably seals the mold cavity during the injection molding stage by automatically switching between sealing and gas injection functions, preventing the melt from entering the gas injection channel and avoiding the formation of protrusions with the same shape as the air pores on the surface of the part. This ensures the integrity of the optical surface and appearance quality of the thick-walled automotive headlight parts. Moreover, during the demolding process, heated and filtered clean air is injected into the mold cavity, and the mold cooling creates a significant temperature difference effect, resulting in a thermal expansion and contraction gap between the part and the mold. The gas can form a uniform gas film in the gap, effectively reducing the demolding resistance of the thick-walled parts and significantly improving the surface quality and optical performance of the parts. The mold also has an auxiliary knocking demolding process, which uses gentle knocking to locally separate the part from the mold cavity interface, making the demolding force distribution more uniform and helping the workpiece to be demolded quickly. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a three-dimensional schematic diagram of the lower mold base in this invention;

[0027] Figure 3 This is a three-dimensional schematic diagram of the lifting plate in this invention;

[0028] Figure 4 This is a three-dimensional schematic diagram of the lifting plate from another perspective in this invention;

[0029] Figure 5 This is a three-dimensional schematic diagram of the transposition disk in this invention;

[0030] Figure 6 This is a three-dimensional schematic diagram of the upper mold base in this invention;

[0031] Figure 7 This is a three-dimensional schematic diagram of the cooling structure in this invention;

[0032] Figure 8 This is a three-dimensional schematic diagram of the support plate from another perspective in this invention;

[0033] Figure 9 This is a three-dimensional schematic diagram of the striking structure in this invention from another perspective.

[0034] The meanings of the markings in the diagram are as follows: 1. Base plate; 2. Lower mold base; 3. Demolding hole; 4. Lifting plate; 5. Lifting structure; 51. Double-headed cylinder; 52. Slider; 53. Support rod; 54. Fixing block; 6. Fixing groove; 7. Changing plate; 8. Changing structure; 81. Mini cylinder; 82. Connecting piece; 83. First gear; 84. Rack plate; 85. Guide groove; 86. Guide ring; 9. Sealing block; 10. Air injection pipe; 11. Air injection structure; 111. Air pump; 112. Heating filter box; 113. Connecting pipe; 12. Support plate; 13. Top plate; 14. Hydraulic rod; 15. Upper mold base; 16. Injection nozzle; 17. Cooling... 171. Water tank; 172. Circulating pump; 173. Heat conduction plate; 174. Cooling fan; 175. Liquid passage pipe; 176. Control valve; 18. Mounting groove; 19. Indexing structure; 191. Drive motor; 192. Second gear; 193. Third gear; 20. Connecting plate; 21. Mounting plate; 22. Striking structure; 221. Motor; 222. Rotary disk; 223. Push-pull rod; 224. Guide rail; 225. Guide block; 226. Lifting frame; 227. Mounting rod; 228. Rubber striking block; 23. Protective sleeve; 24. Limiting groove; 25. Roller; 26. Electric push rod; 27. Positioning hole. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1: This example aims to facilitate the solution of problems associated with traditional injection molding dies. Please refer to [link / reference]. Figures 1-9A thick-walled injection mold for automotive headlights includes a base plate 1 and a lower mold base 2 located at the center of the upper part of the base plate 1. It further includes: demolding holes 3 on the left and right sides of the bottom of the inner wall of the mold cavity above the lower mold base 2; a lifting plate 4 located at the top of the base plate 1 and below the lower mold base 2; lifting structures 5 fixed on both sides of the lifting plate 4; fixing grooves 6 on the left and right sides of the lifting plate 4; a shifting structure 8 at the bottom of the lifting plate 4; a shifting plate 7 rotatably connected inside the fixing grooves 6; a sealing block 9 on one side of the top of the shifting plate 7 near the center of the lifting plate 4; the sealing block 9 penetrating into the demolding hole 3 and slidingly connected to the inner wall of the demolding hole 3; an air injection pipe 10 on the top of the shifting plate 7 and on the side away from the sealing block 9; an air injection structure 11 installed on the front side of the top of the base plate 1; and support plates 12 bolted to the left and right sides of the top of the base plate 1. A top plate 13 is bolted to the top of the upper mold base 2. Hydraulic rods 14 are provided on both the front and rear sides of the bottom of the top plate 13. The bottom end of the output shaft of the hydraulic rods 14 is fixed to the upper mold base 15. A sprue nozzle 16 is connected to the middle of the top of the upper mold base 15. Molten automotive lamp thick-walled material is injected into the mold cavity of the upper mold base 15 and the lower mold base 2 through the sprue nozzle 16. Cooling structures 17 are provided on both the left and right sides of the top of the upper mold base 15. Mounting grooves 18 are provided on the upper rear side of the support plate 12. A rotation structure 19 is provided on the upper side of the opposite side of the support plate 12. A connecting plate 20 is rotatably connected inside the mounting groove 18. The rear side of the connecting plate 20 extends to the rear of the support plate 12. A mounting plate 21 is bolted to the back of the connecting plate 20. A striking structure 22 is movably connected to the surface of the mounting plate 21. Protective sleeves 23 are bolted to both the left and right sides of the lower mold base 2. The top of the air injection pipe 10 extends into the interior of the protective sleeve 23 and slides with the inner wall of the protective sleeve 23.

[0037] In this embodiment: The present invention reliably seals the mold cavity during the injection molding stage by automatically switching between sealing and gas injection functions, preventing the melt from entering the gas injection channel and avoiding the formation of protrusions with the same shape as the air holes on the surface of the part. This ensures the integrity of the optical surface and appearance quality of the thick-walled automotive headlight part. Moreover, during the demolding process, clean air after heating and filtration is injected into the mold cavity. At the same time, the mold cooling creates a significant temperature difference effect, which generates a gap between the part and the mold due to thermal expansion and contraction. The gas can form a uniform gas film in the gap, effectively reducing the demolding resistance of the thick-walled part and significantly improving the surface quality and optical performance of the part. The mold also has an auxiliary knocking demolding process. By gently knocking, the interface between the part and the mold cavity is partially separated, making the demolding force distribution more uniform and helping the workpiece to be demolded quickly.

[0038] Example 2: This example is an improvement on Example 1. The lifting structure 5 includes a double-headed cylinder 51, a slider 52, a support rod 53, and a fixing block 54. The double-headed cylinder 51 is fixed on the left and right sides of the top of the base plate 1. The slider 52 is slidably connected to the left and right sides of the top of the base plate 1 and is located in front of and behind the double-headed cylinder 51. The output shafts on both the front and rear sides of the double-headed cylinder 51 are fixedly connected to the surface of the slider 52 on the opposite side. The support rod 53 is hinged to the top of the slider 52, and the support rods 53 on the front and rear sides are inclined towards each other. Fixing blocks 54 are fixed on both the left and right sides of the lifting plate 4, and the top of the support rod 53 is hinged to both the front and rear sides of the fixing block 54. Limiting grooves 24 are formed on the surface of the top of the base plate 1 on both the left and right sides of the slider 52. Rollers 25 are rotatably connected to both the left and right sides of the slider 52, and the lower part of the rollers 25 extends into the interior of the limiting grooves 24 and rolls with the inner wall of the limiting grooves 24. In the initial stage, the mold lifts... When plate 4 is in the rising state, the sealing block 9 is inserted into the demolding hole 3 inside the mold cavity of the lower mold base 2 to seal the demolding hole 3. After the thick-walled part of the car headlight is cooled and formed in the mold cavity of the lower mold base 2 and the upper mold base 15, the operator can open the double-headed cylinders 51 on the left and right sides. The output shafts on the front and rear sides of the double-headed cylinders 51 are pushed out synchronously, which causes the sliders 52 on the front and rear sides to move in opposite directions. This causes the support rod 53 to pull the upper fixed block 54 down, and the lifting plate 4 between the fixed blocks 54 moves down synchronously. The sealing block 9 is then moved out from the inside of the demolding hole 3, waiting for the subsequent switching of the position between the sealing block 9 and the air injection pipe 10. During the cooling and forming process, the top of the air injection pipes 10 on both sides is always inserted into the protective sleeves 23 on the left and right sides of the demolding hole 3, thereby protecting the air injection hole at the top of the air injection pipe 10 and preventing external dust or impurities from clogging or contaminating the air injection hole at the top of the air injection pipe 10, which would affect the subsequent flexible demolding effect.

[0039] The shifting structure 8 includes a mini cylinder 81, a connecting piece 82, a first gear 83, a rack plate 84, a guide groove 85, and a guide ring 86. The mini cylinder 81 is bolted to the middle of the bottom of the lifting plate 4. The connecting piece 82 is slidably connected to the rear side of the bottom of the lifting plate 4, and the rear end of the output shaft of the mini cylinder 81 is fixedly connected to the front side of the connecting piece 82. The first gear 83 is fixedly connected to the middle of the bottom of the shifting plate 7. The rack plate 84 is fixed to the left and right sides of the front of the connecting piece 82, and the rack plates 84 on both sides mesh with the first gears 83 on the left and right sides. The guide groove 85 is opened on the surface of the inner wall of the fixed groove 6, and the inner wall of the guide groove 85 is annular. The guide ring 86 is fixed to the middle of the surface of the shifting plate 7, and the guide ring 86 is located inside the guide groove 85 and slidably connected to the inner wall of the guide groove 85. When the lifting plate 4 descends, the sealing block 9 above is demolded. When the interior of hole 3 is removed, the operator can open the mini cylinder 81 below. The output shaft of the mini cylinder 81 retracts, causing the connecting plate 82 to move the rack plate 84 on its front left and right sides forward. The forward-moving rack plate 84 drives the first gear 83 on both sides to rotate. The first gear 83 drives the shifting disk 7 on the upper left and right sides to rotate in different directions, switching the position of the sealing block 9 on the top of the shifting disk 7 and the air injection pipe 10. This causes the air injection pipe 10 to move to the bottom of the demolding holes 3 on both sides of the lower mold base 2, so that the air injection pipe 10 is aligned with the demolding hole 3. After the position is switched, the double-headed cylinder 51 can be opened again, causing the output shafts on the front and rear sides of the double-headed cylinder 51 to retract. The fixing block 54 pushes the lifting plate 4 to rise, allowing the air injection pipe 10 to enter the interior of the demolding hole 3, so that air can be injected into the mold cavity for flexible demolding.

[0040] The air injection structure 11 includes an air pump 111, a heated filter box 112, and a connecting pipe 113. The air pump 111 is fixed to the middle of the front side of the top of the base plate 1. The heated filter box 112 is fixed to the middle of the top of the base plate 1 and is connected to the air pump 111. An air extraction pipe is connected to the rear side of the heated filter box 112. A filter element is fixed to the rear side of the inner wall of the heated filter box 112, and a heating wire is installed on the front side of the inner wall of the heated filter box 112. The connecting pipe 113 is connected to the top of the air pump 111 and is T-shaped. The two ends of the top of the connecting pipe 113 are connected to the air injection pipe 10. The connecting pipe 113 is a retractable flexible hose. After the 10 enters the demolding hole 3, the operator can turn on the heating wire inside the heating filter box 112 for preheating, and then turn on the air pump 111 so that the air extraction pipe behind the heating filter box 112 draws in the surrounding air. After the air enters the interior of the heating filter box 112, it is first filtered by the filter element and heated by the heating wire. Finally, the hot air is discharged into the interior of the air injection pipe 10 through the connecting pipe 113 and finally enters the interior of the mold cavity for flexible demolding. The connecting pipe 113 is a telescopic hose, so that when the air injection pipe 10 and the sealing block 9 are switched, the connecting pipe 113 can be stretched or bent to stably deliver air.

[0041] The cooling structure 17 includes a water tank 171, a circulating pump 172, a heat-conducting plate 173, a cooling fan 174, a liquid-conducting pipe 175, and a control valve 176. The water tank 171 is fixed to the front and rear sides of the top left and right sides of the upper mold base 15. The circulating pump 172 is located between the front and rear water tanks 171 and is connected to the front and rear water tanks 171. The water tank 171 is filled with coolant. Several heat-conducting plates 173 are installed through the top of the water tank 171 and extend below into the interior of the water tank 171. The cooling fan 174 is fixed to the top of the heat-conducting plate 173. The liquid-conducting pipe 175 is connected to one side of the front and rear water tanks 171 and passes through the upper mold base 15 and is fixedly connected to the upper mold base 15. The control valve 176 is connected to the water tank 171. On one side of the surface, before the thick-walled part of the headlight needs to be flexibly demolded, the operator can turn on the circulation pump 172. The circulation pump 172 causes the coolant inside the water tank 171 to circulate in the liquid pipe 175. The cooling fan 174 above is turned on. After the liquid pipe 175 flows inside the upper mold base 15, it transfers the heat inside the upper mold base 15 to the inside of the water tank 171. The heat is discharged through the heat conduction plate 173 and the cooling fan 174, thereby cooling the inside of the upper mold base 15. At this time, the air injection pipe 10 below discharges the heated air into the mold cavity. The gap is created by the simultaneous entry of hot and cold air into the mold cavity and the difference in thermal expansion and contraction. Combined with the inflation to form an air film, low-stress demolding is achieved. Through the setting of the control valve 176, the operator can periodically drain and replace the coolant inside the water tank 171 to maintain the cooling effect.

[0042] The indexing structure 19 includes a drive motor 191, a second gear 192, and a third gear 193. The drive motor 191 is fixed above the opposite side of the support plate 12. The second gear 192 is fixed to the top of the output shaft of the drive motor 191. The third gear 193 is rotatably connected to the front side of the bottom of the mounting groove 18, and the front side of the bottom of the connecting plate 20 is fixedly connected to the top of the third gear 193. The striking structure 22 includes a motor 221, a rotating disk 222, a push-pull rod 223, a guide rail 224, a guide block 225, a lifting frame 226, a mounting rod 227, and a rubber striking block 228. The motor 221 is fixed above the opposite side of the mounting plate 21, and the rotating disk 222 is rotatably connected above the opposite side of the mounting plate 21. The output shaft of machine 221 passes through mounting plate 21 and is fixedly connected to rotating disk 222. Push-pull rod 223 is rotatably connected to the surface of rotating disk 222 on the opposite side. Guide rail 224 is fixed to the surface of mounting plate 21 on the opposite side and located below rotating disk 222. Guide block 225 is sleeved on the middle of the surface of guide rail 224 and is slidably connected to guide rail 224. Lifting frame 226 is fixed to the surface of guide block 225 on the opposite side. Mounting rod 227 is bolted to the bottom of lifting frame 226, and the bottom end of push-pull rod 223 is rotatably connected to the surface of lifting frame 226 on one side. Rubber striking block 228 is fixed to the bottom of mounting rod 227. Support plate 12 is located on the surface of opposite side and below mounting groove 18. Each component is fixed with an electric push rod 26. Positioning holes 27 are provided on the rear side of the bottom of the connecting plate 20. The output shaft of the electric push rod 26 is slidably connected to the inner wall of the positioning hole 27. When the liquid pipe 175 at the top of the upper mold base 15 is cooling the mold cavity, the operator opens the drive motors 191 on both sides. The output shaft of the drive motor 191 drives the upper second gear 192 to rotate, which in turn drives the third gear 193 to rotate, causing the connecting plate 20 to rotate inside the mounting groove 18. The connecting plate 20 then rotates the rear mounting plate 21 by ninety degrees, causing the rubber striking block 228 on one side of the mounting plate 21 to rotate to the top of the upper mold base 15. At this point, the operator opens the electric push rod 26 again. The output shaft of the electric push rod 26 is extended, allowing it to insert into the positioning hole 27 at the bottom of the connecting plate 20, thus completing the positioning of the connecting plate 20. At the same time, the operator turns on the motor 221, causing the output shaft of the motor 221 to drive the rotating disk 222 to rotate. The rotating disk 222 rotates and pushes the push-pull rod 223, which in turn pulls the guide block 225 back and forth on the surface of the guide rail 224, causing the mounting rod 227 at the bottom of the lifting frame 226 to push the rubber striking block 228 to move up and down. The rubber striking block 228 gently taps the left and right sides of the top of the upper mold base 15, causing partial separation between the thick-walled part and the mold cavity interface, thus assisting in subsequent rapid and flexible demolding.

[0043] A flexible demolding method for injection molding molds of thick-walled automotive headlight parts, specifically including the following steps:

[0044] A: When this injection molding mold is working, the hydraulic rods 14 on the front and rear sides of the bottom of the top plate 13 first push the upper mold base 15 downward, so that the upper mold base 15 and the lower mold base 2 are closed. At this time, the lifting plate 4 is in the rising state, and the sealing blocks 9 on the left and right shifting plates 7 on the left and right sides of the lifting plate 4 are inserted into the demolding holes 3 on the left and right sides of the bottom of the inner wall of the lower mold base 2, reliably sealing the demolding holes 3 to prevent the molten material from leaking during injection. At the same time, the top of the air injection pipe 10 is located inside the protective sleeve 23 to prevent the air injection hole from being exposed to external dust. Or impurities contaminate and block the mold. After the mold is closed, the molten thick-walled part of the car headlight is injected into the mold cavity composed of the lower mold base 2 and the upper mold base 15 through the injection nozzle 16 at the top center of the upper mold base 15 for filling, holding pressure and cooling molding. During the injection molding process, the lifting structure 5 at the bottom of the lower mold base 2 keeps the sealing block 9 blocking the demolding hole 3. The double-headed cylinder 51 does not move. The sliders 52 on the front and rear sides are located in the limiting groove 24. The roller 25 rolls with the limiting groove 24 to ensure the stable position of the lifting plate 4.

[0045] B: After the thick-walled part of the car headlight cools and forms in the mold cavity, the hydraulic rod 14 drives the upper mold base 15 to rise and open the mold. At this time, the double-headed cylinders 51 on the left and right sides need to be activated so that the output shafts on the front and rear sides of the double-headed cylinders 51 are pushed out synchronously, pushing the sliders 52 on the front and rear sides away from each other along the limiting groove 24. The rollers 25 on the sliders 52 roll in the limiting groove 24 to ensure smooth movement. The sliders 52 drive the hinged support rod 53 to move. The support rod 53 pulls the fixed block 54 and the lifting plate 4 down as a whole, so that the sealing block 9 is moved out of the demolding hole 3. Then the mini cylinder 81 is activated. The output shaft of the mini cylinder 81 retracts, driving the connecting piece 82. The rack plate 84 on the left and right sides of the front of the connecting piece 82 moves forward, and the rack plate 84 drives the first gear 83 meshing with it to rotate. The first gear 83 drives the shifting plate 7 to rotate in the fixed groove 6. The guide ring 86 slides along the guide groove 85 to ensure stable rotation, thereby switching the position of the sealing block 9 at the top of the shifting plate 7 and the air injection pipe 10, so that the air injection pipe 10 is aligned with the demolding hole 3. After the position switching is completed, the double-headed cylinder 51 is started again to retract the output shaft, the slider 52 moves closer to each other, and the support rod 53 pushes the fixed block 54 and the lifting plate 4 to rise, driving the air injection pipe 10 into the demolding hole 3, completing the preparation before air injection.

[0046] C: After the air injection pipe 10 is in place, the circulation pump 172 is started first, so that the coolant in the water tank 171 circulates in the liquid passage pipe 175. The liquid passage pipe 175 passes through the interior of the upper mold base 15, carrying away the heat of the upper mold base 15. At the same time, the cooling fan 174 rotates, and the heat absorbed by the coolant in the water tank 171 is dissipated into the air through the heat conduction plate 173, thereby cooling the upper mold base 15 and the mold cavity, causing the core or cavity to shrink. Then, the heating wire in the heating filter box 112 is started. After the air pump 111 starts, air enters through the extraction pipe at the rear of the heating filter box 112. Impurities are first removed by the filter element, and then the air is heated by the heating wire to become clean hot air. The hot air is then delivered to the injection pipe 10 via the connecting pipe 113. Since the connecting pipe 113 is a flexible hose, it can adapt to changes in the position of the injection pipe 10. Finally, the hot air enters from the top of the injection pipe 10 at the interface between the mold cavity and the workpiece, heating the inner surface of the workpiece to cause it to expand and create a temperature difference gap with the cooled mold. Hot air forms an air film in the gap, achieving initial separation for flexible demolding. At the same time, the drive motor 191 is started, which drives the second gear 192 to rotate. The second gear 192 drives the third gear 193 to rotate, causing the connecting plate 20 to rotate 90 degrees in the mounting groove 18. The mounting plate 21 drives the striking structure 22 to rotate to the top of the upper mold base 15. Then, the output shaft of the electric push rod 26 extends and inserts into the positioning hole 27 at the bottom of the connecting plate 20, completing the locking of the connecting plate 20. Then, the motor 221 is started, driving the rotating disk 222 to rotate. The rotating disk 222 pulls the guide block 225 to slide up and down along the guide rail 224 through the push-pull rod 223. The guide block 225 drives the lifting frame 226 and the mounting rod 227 to move up and down, so that the rubber striking block 228 slightly strikes the left and right sides of the top of the upper mold base 15, causing local separation between the thick-walled part and the mold cavity interface, reducing the adhesion force, and assisting the hot air to enter the interface more smoothly, thus enhancing the flexible demolding effect.

[0047] D: Under the combined action of cooling structure 17 cooling the mold, air injection structure 11 injecting hot air to form an air film, and striking structure 22 applying mechanical vibration, a uniform gap is formed between the thick-walled part of the car headlight and the mold cavity interface. The part is lifted by the air film and micro-vibration and is released from the mold cavity with low stress, completing the flexible demolding. After demolding, air injection structure 11 stops supplying air, cooling structure 17 stops working, striking structure 22 stops striking, electric push rod 26 output shaft retracts, and indexing structure 19 rotates in the opposite direction to make striking structure 22 rotate back to the rear side of support plate 12. Then, double-headed cylinder 51 acts again to make lifting plate 4 descend, air injection pipe 10 exits demolding hole 3, and repositioning structure 8 works in the opposite direction to make repositioning plate 7 rotate, realigning sealing block 9 with demolding hole 3. Double-headed cylinder 51 pushes lifting plate 4 up, sealing block 9 is inserted into demolding hole 3 again for sealing, and the top of air injection pipe 10 returns to the protective sleeve 23 for protection.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A molding die for thick-walled automotive headlight components, comprising a base plate (1) and a lower mold base (2) disposed in the upper center of the base plate (1), characterized in that, Also includes: Demolding holes (3) are opened on the left and right sides of the bottom of the inner wall of the mold cavity above the lower mold base (2). A lifting plate (4) is provided on the top of the base plate (1) and below the lower mold base (2). Lifting structures (5) are fixed on both the left and right sides of the lifting plate (4). Fixed grooves (6) are provided on the left and right sides of the lifting plate (4). A shifting structure (8) is also provided at the bottom of the lifting plate (4). A shifting plate (7) is rotatably connected inside the fixed groove (6). A sealing block (9) is provided on the side of the top of the shifting plate (7) near the center of the lifting plate (4). The sealing block (9) penetrates into the interior of the demolding hole (3) and slides in connection with the inner wall of the demolding hole (3). An air injection pipe (10) is provided on the top of the shifting plate (7) and on the side away from the sealing block (9). An air injection structure (11) is installed on the front side of the top of the bottom plate (1). Support plates (12) are bolted to the top left and right sides of the base plate (1). A top plate (13) is bolted to the top of the support plate (12). Hydraulic rods (14) are provided on the front and rear sides of the bottom of the top plate (13). An upper mold base (15) is fixed at the bottom end of the output shaft of the hydraulic rod (14). An injection nozzle (16) is connected to the middle of the top of the upper mold base (15). Cooling structures (17) are provided on the left and right sides of the top of the upper mold base (15). An installation groove (18) is provided on the upper side of the rear side of the support plate (12). An indexing structure (19) is provided on the upper side of the opposite side of the support plate (12). A connecting plate (20) is rotatably connected inside the mounting groove (18). The rear side of the connecting plate (20) extends to the rear of the support plate (12). A mounting plate (21) is bolted to the back of the connecting plate (20). A striking structure (22) is movably connected to the surface of the mounting plate (21). Protective sleeves (23) are bolted to both the left and right sides of the lower mold base (2). The top of the air injection pipe (10) extends into the interior of the protective sleeve (23) and slides in connection with the inner wall of the protective sleeve (23).

2. The injection molding die for a thick-walled automotive headlight component according to claim 1, characterized in that: The lifting structure (5) includes a double-headed cylinder (51) set on the left and right sides of the top of the base plate (1), and a slider (52) slidably connected on the left and right sides of the top of the base plate (1) and in front and behind the double-headed cylinder (51). The output shafts on the front and back sides of the double-headed cylinder (51) are fixedly connected to the surface of the slider (52) on the opposite side. A support rod (53) is hinged to the top of the slider (52). Fixing blocks (54) are connected to the left and right sides of the lifting plate (4). The top of the support rod (53) is hinged to the front and back sides of the fixing block (54).

3. The injection molding die for a thick-walled automotive headlight component according to claim 2, characterized in that: Limiting grooves (24) are provided on the top surface of the base plate (1) and on the left and right sides of the slider (52). Rollers (25) are rotatably connected to the left and right sides of the slider (52). The rollers (25) extend below into the interior of the limiting grooves (24) and roll to the inner wall of the limiting grooves (24).

4. The injection mold for thick-walled automotive headlight parts according to claim 1, characterized in that: The shifting structure (8) includes a mini cylinder (81), a connecting piece (82), a first gear (83), a rack plate (84), a guide groove (85), and a guide ring (86). The mini cylinder (81) is bolted to the middle of the bottom of the lifting plate (4). The connecting piece (82) is slidably connected to the rear side of the bottom of the lifting plate (4). The rear end of the output shaft of the mini cylinder (81) is connected to the front side of the connecting piece (82). The first gear (83) is connected to the middle of the bottom of the shifting disk (7). The rack plate (84) is set on the left and right sides of the front of the connecting piece (82). The rack plates (84) on both sides mesh with the first gears (83) on the left and right sides. The guide groove (85) is opened on the surface of the inner wall of the fixed groove (6). The inner wall of the guide groove (85) is annular. The guide ring (86) is set in the middle of the surface of the shifting disk (7). The guide ring (86) is located inside the guide groove (85) and is slidably connected to the inner wall of the guide groove (85).

5. The injection mold for thick-walled automotive headlight parts according to claim 1, characterized in that: The air injection structure (11) includes an air pump (111) located in the middle of the front side of the top of the base plate (1). A heating filter box (112) is also provided on the top of the base plate (1). The heating filter box (112) is connected to the air pump (111). An air extraction pipe is connected to the rear side of the heating filter box (112). A filter element is provided on the rear side of the inner wall of the heating filter box (112). A heating wire is installed on the front side of the inner wall of the heating filter box (112). A connecting pipe (113) is also connected to the top of the air pump (111). The connecting pipe (113) is T-shaped. The two ends of the top of the connecting pipe (113) are connected to the air injection pipe (10) respectively. The connecting pipe (113) is a retractable hose.

6. The injection mold for thick-walled automotive headlight parts according to claim 1, characterized in that: The cooling structure (17) includes water tanks (171) located on the front and rear sides of the top left and right sides of the upper mold base (15). A circulation pump (172) is provided between the front and rear water tanks (171) and is connected to the front and rear water tanks (171). The interior of the water tanks (171) is filled with coolant. A heat-conducting plate (173) is provided through the top of the water tanks (171) and there are several heat-conducting plates (173). The bottom of the heat-conducting plate (173) extends into the interior of the water tanks (171). A heat-conducting fan (174) is provided on the top of the heat-conducting plate (173). A liquid pipe (175) is connected to one side of the front and rear water tanks (171) and passes through the upper mold base (15) and is connected to the upper mold base (15). A control valve (176) is also connected to one side of the surface of the water tanks (171).

7. The injection molding die for a thick-walled automotive headlight component according to claim 1, characterized in that: The indexing structure (19) includes a drive motor (191) fixed above the opposite side of the support plate (12), a second gear (192) is fixedly connected to the output shaft of the drive motor (191), a third gear (193) is rotatably connected to the front side of the bottom of the mounting groove (18), and the front side of the bottom of the connecting plate (20) is fixedly connected to the top of the third gear (193).

8. The injection mold for thick-walled automotive headlight parts according to claim 1, characterized in that: The striking structure (22) includes a motor (221), a rotating disk (222), a push-pull rod (223), a guide rail (224), a guide block (225), a lifting frame (226), a mounting rod (227), and a rubber striking block (228). The motor (221) is fixed above the opposite side of the mounting plate (21), and the rotating disk (222) is rotatably connected above the opposite side of the mounting plate (21). The output shaft of the motor (221) passes through the mounting plate (21) and is connected to the rotating disk (222). The push-pull rod (223) is rotatably connected to the opposite side of the rotating disk (222). The guide rail (224) is set on the surface of the mounting plate (21) facing the rotating disk (222) and located below the rotating disk (222). The guide block (225) is sleeved on the middle of the surface of the guide rail (224). The guide block (225) and the guide rail (224) are slidably connected. The lifting frame (226) is set on the surface of the guide block (225) facing the side. The mounting rod (227) is bolted to the bottom of the lifting frame (226). The bottom end of the push-pull rod (223) is rotatably connected to the surface of one side of the lifting frame (226). The rubber striking block (228) is set at the bottom of the mounting rod (227).

9. The injection mold for thick-walled automotive headlight parts according to claim 1, characterized in that: Electric push rods (26) are provided on the surface of the support plate (12) facing each other and below the mounting groove (18). Positioning holes (27) are provided on the rear side of the bottom of the connecting plate (20). The output shaft of the electric push rod (26) is slidably connected to the inner wall of the positioning hole (27).

10. A flexible demolding method for an injection mold of a thick-walled automotive headlight component, as described in claims 1-9, characterized in that... Specifically, the following steps are included: A: When the injection molding mold is working, the hydraulic rods (14) on the front and rear sides of the bottom of the top plate (13) first push the upper mold base (15) downward, so that the upper mold base (15) and the lower mold base (2) can be closed. At this time, the lifting plate (4) is in the rising state. The sealing blocks (9) on the left and right shifting plates (7) of the lifting plate (4) are inserted into the demolding holes (3) on the left and right sides of the bottom of the inner wall of the mold cavity of the lower mold base (2) to reliably seal the demolding holes (3) and prevent the molten material from leaking during injection. At the same time, the top of the air injection pipe (10) is located inside the protective sleeve (23) to prevent the air injection hole from being exposed to external dust. Or impurities contaminate and block. After the mold is closed, the molten car lamp thick-walled part material is injected into the mold cavity composed of the lower mold base (2) and the upper mold base (15) through the injection nozzle (16) in the middle of the top of the upper mold base (15) for filling, holding pressure and cooling molding. During the injection molding process, the lifting structure (5) at the bottom of the lower mold base (2) keeps the sealing block (9) blocking the demolding hole (3). The double-headed cylinder (51) does not move. The sliders (52) on the front and rear sides are located in the limiting groove (24). The roller (25) rolls with the limiting groove (24) to ensure the stable position of the lifting plate (4). B: After the thick-walled part of the car headlight is cooled and formed in the mold cavity, the hydraulic rod (14) drives the upper mold base (15) to rise and open the mold. At this time, the double-headed cylinders (51) on the left and right sides need to be activated so that the output shafts of the double-headed cylinders (51) on the front and rear sides are pushed out synchronously, pushing the sliders (52) on the front and rear sides to move away from each other along the limiting groove (24). The rollers (25) on the sliders (52) roll in the limiting groove (24) to ensure smooth movement. The sliders (52) drive the hinged support rods (53) to move. The support rods (53) pull the fixed block (54) and the lifting plate (4) to fall as a whole, so that the sealing block (9) moves out from the demolding hole (3). Then the mini cylinder (81) is activated. The output shaft of the mini cylinder (81) retracts, driving the connecting piece (82) to move backward. The rack plate (84) on the left and right sides of the front of the connecting piece (82) moves forward, and the rack plate (84) drives the first gear (83) meshing with it to rotate. The first gear (83) drives the shifting plate (7) to rotate in the fixed groove (6). The guide ring (86) slides along the guide groove (85) to ensure stable rotation, thereby switching the position of the sealing block (9) on the top of the shifting plate (7) and the air injection pipe (10) so that the air injection pipe (10) is aligned with the demolding hole (3). After the position switching is completed, the double-headed cylinder (51) is started again to retract the output shaft, the slider (52) moves closer to each other, and the support rod (53) pushes the fixed block (54) and the lifting plate (4) to rise, driving the air injection pipe (10) into the demolding hole (3) to complete the preparation before air injection. C: After the air injection pipe (10) is in place, the circulation pump (172) is started first, so that the coolant in the water tank (171) circulates in the liquid pipe (175). The liquid pipe (175) passes through the interior of the upper mold base (15) and carries away the heat of the upper mold base (15). At the same time, the cooling fan (174) rotates and dissipates the heat absorbed by the coolant in the water tank (171) into the air through the heat conduction plate (173), thereby cooling the upper mold base (15) and the mold cavity, causing the core or cavity to shrink. Then, the heating filter box (112) is started. After the heating wire and air pump (111) are started, air enters through the extraction pipe behind the heating filter box (112). Impurities are first removed by the filter element, and then the heating wire heats the air to make it clean hot air. The hot air is then transported to the air injection pipe (10) through the connecting pipe (113). Since the connecting pipe (113) is a flexible hose, it can adapt to the position changes of the air injection pipe (10). Finally, the hot air enters the interface between the mold cavity and the part from the top of the air injection pipe (10), heating the inner surface of the part to make it expand and forming a temperature difference gap with the cooled mold. At the same time, the hot air enters the gap. An air film is formed, achieving initial separation for flexible demolding. Simultaneously, the drive motor (191) is activated, driving the second gear (192) to rotate. The second gear (192) drives the third gear (193) to rotate, causing the connecting plate (20) to rotate 90 degrees within the mounting groove (18). The mounting plate (21) drives the striking structure (22) to rotate to the top of the upper mold base (15). Then, the output shaft of the electric push rod (26) extends and inserts into the positioning hole (27) at the bottom of the connecting plate (20), completing the locking of the connecting plate (20). Then, the motor (221) starts, driving the rotating disk (222) to rotate. The rotating disk (222) pulls the guide block (225) along the guide rail (224) through the push-pull rod (223) to slide up and down. The guide block (225) drives the lifting frame (226) and the mounting rod (227) to move up and down, so that the rubber striking block (228) gently strikes the left and right sides of the top of the upper mold base (15), causing the thick-walled part to be partially separated from the mold cavity interface, reducing the adhesion force, and assisting the hot air to enter the interface more smoothly, thus enhancing the flexible demolding effect. D: Under the combined action of cooling structure (17) to cool the mold, air injection structure (11) to inject hot air to form an air film, and striking structure (22) to apply mechanical vibration, a uniform gap is formed between the thick-walled part of the car lamp and the mold cavity interface. The part is lifted by the air film and micro-vibration and is released from the mold cavity with low stress, completing the flexible demolding. After demolding, air injection structure (11) stops supplying air, cooling structure (17) stops working, striking structure (22) stops striking, electric push rod (26) output shaft retracts, and indexing structure ( 19) The reverse rotation causes the striking structure (22) to turn back to the back of the support plate (12). Then the double-headed cylinder (51) moves again to lower the lifting plate (4), and the air injection pipe (10) exits the demolding hole (3). The switching structure (8) works in reverse to rotate the switching plate (7) and realign the sealing block (9) with the demolding hole (3). The double-headed cylinder (51) pushes the lifting plate (4) to rise, and the sealing block (9) is inserted into the demolding hole (3) again to seal it. The top of the air injection pipe (10) returns to the protective sleeve (23) for protection.

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