A micro core-pulling injection mold for a plastic car lamp support

Abstract

The present application relates to a kind of micro core-pulling injection moulds of plastic car lamp support, including upper die body and lower die body, upper die body includes upper fixed plate and fixed plate, lower die body includes lower fixed plate, several die feet, movable platen and ejection mechanism, movable platen is equipped with forming insert, first forming groove is opened in forming insert, first slide groove is opened in the bottom wall of first forming groove, first forming block is slidably connected in first slide groove, two first inclined grooves are opened in the side wall of first forming block, two first inclined grooves are slidably connected with first slider, the side of two first sliders away from each other is equipped with second forming block for forming slot, two second slide grooves are opened in the side wall of first slide groove, the bottom of two first sliders is equipped with limiting block, two limiting blocks are slidably connected in two second slide grooves, first drive part is further provided on movable platen.The present application guarantees the formation of slot also solves the demoulding problem of lamp bead mounting seat.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to a miniature core-pulling injection mold for a plastic car headlight bracket. Background Technology

[0002] A plastic car headlight bracket includes a bracket body 10. The back of the bracket body 10 has a fixing rib 101 and a lamp bead mounting base 102. The fixing rib 101 has several mounting slots 103, and the lamp bead mounting base 102 has two retaining slots 104, which are arranged opposite to each other. After the bracket body 10 is injection molded, the two retaining slots 104 form an undercut structure with the molded part used to form the retaining slots 104 on the mold, affecting the demolding of the bracket body 10. Therefore, ensuring the two retaining slots 104 are formed while simultaneously removing the undercut structure between the two retaining slots 104 and the molded part becomes a problem. Summary of the Invention

[0003] This application provides a miniature core-pulling injection mold for a plastic vehicle headlight bracket, which ensures the molding of the slot while also solving the demolding problem of the lamp bead mounting seat.

[0004] The technical solution provided in this application for a miniature core-pulling injection mold for a plastic vehicle headlight bracket is as follows: A miniature core-pulling injection mold for a plastic car headlight bracket includes an upper mold body and a lower mold body. The upper mold body includes an upper fixed plate and a fixed template. The lower mold body includes a lower fixed plate, several mold feet, a movable template, and an ejection mechanism. The movable template is provided with a molding insert for molding the bracket body. The molding insert has a first molding groove. A first sliding groove is formed on the bottom wall of the first molding groove. A first molding block is slidably connected in the first sliding groove. Two first inclined grooves are formed on the side wall of the first molding block. The distance between the two first inclined grooves gradually increases from their tops to their bottoms. The width of both first inclined grooves gradually increases from the bottom to the opening. The mold gradually narrows, and each of the two first inclined grooves is slidably connected to a first slider. Each of the two first sliders is provided with a second forming block for forming a slot on its opposite side. Two second sliding grooves are opened on the side wall of the first sliding groove. Each of the two first sliders is provided with a limiting block at its bottom. The two limiting blocks are slidably connected in the two second sliding grooves respectively. The moving template is also provided with a first driving part for driving the movement of the first forming block. When the mold is closed, the first forming block extends into the first forming groove, and a first forming cavity for forming the lamp bead mounting base is formed between the first forming block and the first forming groove. The two second forming blocks are located in the first forming cavity.

[0005] By adopting the above technical solution, after the bracket body is injection molded, the first drive unit controls the first molding block to move into the first slide groove. With the cooperation of the two limiting blocks and the two second slide grooves, when the first molding block moves into the first slide groove, it will drive the two first sliders to move closer to each other through the two first inclined grooves. When the two first sliders move closer to each other, the two second molding blocks will also move away from the two slots. Finally, the two second molding blocks will completely disengage from the two slots, releasing the inverted structure between the slots and the second molding blocks.

[0006] Preferably, the first driving part includes a pull rod, a pull block disposed on the pull rod, and a hydraulic cylinder. The forming insert has a third slide groove that communicates with the first slide groove. The pull rod is slidably connected in the third slide groove. The hydraulic cylinder is disposed on the moving template and is used to drive the pull rod to move. The distance between the pull block and the lower fixed plate gradually decreases from the end near the hydraulic cylinder to the end far from the hydraulic cylinder. The bottom end of the first forming block extends into the third slide groove. The bottom end of the first forming block has a second inclined groove. The pull block is slidably connected in the second inclined groove. When the mold is closed, the end of the pull block near the hydraulic cylinder is located in the second inclined groove.

[0007] By adopting the above technical solution, after the bracket body is injection molded, the hydraulic cylinder pulls the tie rod away from the third slide groove. When the tie rod moves, it will drive the first molding block to move into the first slide groove through the cooperation of the pull block and the second inclined groove. After the bracket body is removed from the mold, the hydraulic cylinder pushes the tie rod to move into the third slide groove. The movement of the tie rod will drive the first molding block away from the first slide groove through the cooperation of the pull block and the second inclined groove, so that the first molding block extends into the first molding groove.

[0008] Preferably, the molding insert has a fourth slide groove that connects to the third slide groove, and a second slider is slidably connected in the fourth slide groove. The first molding groove, the first slide groove, and the two second slide grooves are all provided on the second slider. The pull rod has a first plane, a guide slope, and a second plane. The guide slope connects the first plane and the second plane. The inclination angle of the guide slope is the same as the inclination angle of the pull block. The first plane is located between the second plane and the oil cylinder. When the mold is closed, the bottom end of the second slider abuts against the first plane.

[0009] By adopting the above technical solution, after the mold injection is completed and the mold opens, when the hydraulic cylinder pulls the tie rod away from the third slide, the second slider is stationary under the limit of the first plane, while the pull block will drive the first molding block to move into the first slide. As the tie rod continues to move, the second slider will contact the guide slope. Under the combined action of the guide slope and the pull block, the second slider and the first molding block will move together away from the already formed lamp bead mounting seat, so that the second slider moves away from the lamp bead mounting seat, thereby releasing the undercut structure between the second slider and the lamp bead mounting seat. During this process, the second slider and the first molding block will remain relatively stationary. Finally, the second slider will move to the second plane, at which point the second slider will completely detach from the lamp bead mounting seat. After the injection-molded bracket body is removed from the mold, the hydraulic cylinder pushes the tie rod to move and reset. During the resetting process, the second slider will first move and reset together with the first molding block. The second slider will first move to the first plane. At this time, the second slider will move to the initial position and then rise again, but the first molding block has not yet moved to the initial position. Then, as the pull rod continues to reset, the first forming block will move into the first forming groove through the cooperation of the pull block and the second inclined groove, and finally move to reset.

[0010] Preferably, a first wear-resistant block and a second wear-resistant block are respectively provided on both sides of the bottom end of the second slider. The first wear-resistant block is used to abut against the first plane, the second plane and the guide slope. An installation groove is also provided on the side wall of the third slide groove. The installation groove is located below the fourth slide groove and is connected to the fourth slide groove. A limiting rod is provided in the installation groove. The limiting rod is located on the movement path of the second slider. The top surface of the limiting rod is flush with the second plane.

[0011] By adopting the above technical solution, the wear-resistant block can effectively prevent wear during the movement of the second slider. The limit rod is set to limit the movement of the second slider and prevent it from continuing to move downward after reaching the second plane.

[0012] Preferably, the second slider includes a first assembly block and a second assembly block, and two second sliding grooves are respectively located on the first assembly block and the second assembly block. A cavity is provided on the side of the first assembly block and the second assembly block that are connected to each other. When the first assembly block and the second assembly block are connected to each other, the two cavities are interconnected to form an exhaust chamber. An exhaust groove that connects to the first forming cavity is provided on the bottom wall of the exhaust chamber.

[0013] By adopting the above technical solution, the processing of the second slider is facilitated, and at the same time, when the hot melt plastic fills the first molding cavity, the air in the first molding cavity can enter the exhaust cavity through the exhaust groove, thereby preventing the phenomenon of trapped air in the first molding cavity and ensuring that the lamp bead mounting base is completely formed.

[0014] Preferably, the exhaust chamber is connected to the first sliding groove, a rubber airbag is fixedly connected to the bottom wall of the exhaust chamber, the air outlet of the rubber airbag is connected to the exhaust groove, a pressure plate is provided on the first molding block, the pressure plate is connected to the top of the rubber airbag, and when the mold is closed, the pressure plate abuts against the top wall of the exhaust chamber.

[0015] By adopting the above technical solution, when the first molding block moves into the first slide groove, the first molding block will drive the rubber airbag to compress through the pressure block. When the rubber airbag is compressed, it will force air through the exhaust groove into the space between the lamp bead mounting base and the second slider, thereby releasing the adhesion between the lamp bead mounting base and the second slider, making it less likely for the second slider to damage the lamp bead mounting base when it moves. Furthermore, the cooperation between the pressure block and the exhaust chamber can limit the movement of the first molding block, preventing it from excessively extending into the first molding groove when it moves back to its original position.

[0016] Preferably, the fixed template is provided with a limiting post, and the moving template is provided with a first slot for the limiting post to be inserted. When the mold is closed, the limiting post is inserted into the first slot, and the bottom end of the limiting post is located on the side of the pull rod near the oil cylinder, and the bottom end of the limiting post abuts against the pull rod.

[0017] By adopting the above technical solution, when the mold is closed, the limiting post will restrict the movement of the tie rod, so that the second slider and the first molding block will not move backward due to the injection pressure during the injection of the mold, thus preventing the step difference between the lamp bead mounting base and the bracket body.

[0018] Preferably, the molding insert has a second molding cavity for molding the fixing rib, the molding insert has a plurality of fifth sliding grooves, and the molding insert also has a plurality of connecting grooves connecting the plurality of fifth sliding grooves and the second molding cavity. Each of the plurality of fifth sliding grooves is slidably connected to a third slider, each of the plurality of third sliders is provided with a core-pulling block for molding the assembly groove, and the plurality of core-pulling blocks are respectively slidably connected to the plurality of connecting grooves. The fixed template also has a plurality of second driving parts for controlling the movement of the third sliders.

[0019] By adopting the above technical solution, when the mold is closed, several second driving units drive several third sliders to move toward the second molding cavity, causing several core-pulling blocks to extend into the second molding cavity. After the mold is opened, several second driving units drive several third sliders to move away from the second molding cavity, causing several core-pulling blocks to move away from the second molding cavity and release the undercut structure with several assembly slots.

[0020] Preferably, the second driving part includes a rod and an inclined block disposed at the bottom of the rod. Each of the third sliders is provided with a third inclined groove for the inclined block to be inserted. The distance from the third inclined groove to the lower fixed plate gradually decreases from the end near the second molding cavity to the end away from the second molding cavity. Each of the third inclined grooves corresponds to a number of inclined blocks. The inclination angle of each of the inclined blocks is the same as the inclination angle of the corresponding third inclined groove. Each of the fifth slides has a second slot along the mold opening direction on its sidewall. The top end of the rod is fixed on the fixed template. When the mold is closed, the rods are inserted into the second slots, the inclined blocks are inserted into the third inclined grooves, and the ends of the core-pulling blocks away from the corresponding third sliders extend into the second molding cavity.

[0021] By adopting the above technical solution, when the mold closes, the injection molding machine pushes the lower mold body towards the upper mold body. During this process, several inclined blocks first insert into several third inclined slots. Then, as the moving mold plate continues to move, several inclined blocks further insert into the third inclined slots and push several third sliders to move, causing several core-pulling blocks to move into the second molding cavity. Then, the injection molding machine begins to inject plastic into the mold to form the product. After the product is formed, the injection molding machine controls the lower mold body to move away from the upper mold body. During this process, several inclined blocks disengage from several third inclined slots, causing several third sliders to move away from the second molding cavity. When the several third sliders move away from the second molding cavity, they will drive several core-pulling blocks to move away from the second molding cavity.

[0022] Preferably, each of the third sliders is fitted with a mounting block, and each of the fifth slide grooves is provided with a spring. One end of each spring abuts against the side wall of the fifth slide groove near the second forming cavity, and the other end of each spring abuts against the mounting block. The springs are always in a compressed state. When the mold opens, the springs press the third sliders against the side wall of the fifth slide groove away from the corresponding connecting groove. The ends of the inclined blocks near the moving template are located on the movement path of the third inclined grooves.

[0023] By adopting the above technical solution, several springs are set so that when the mold is closed, several inclined blocks can be smoothly inserted into several third inclined grooves.

[0024] The main technical effects of this invention are reflected in the following aspects: 1. This invention achieves the spaced core pulling between the first forming block and the second slider by means of the movement of the pull rod; 2. The first molding cavity of the present invention is not easily trapped with air, and the lamp bead mounting seat is fully molded during injection molding; 3. The present invention uses the opening and closing action of the mold to control whether several core-pulling blocks move into the second molding cavity. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of the support body.

[0026] Figure 2 This is a structural diagram of the mold in the closed state of this application.

[0027] Figure 3 yes Figure 2 A schematic diagram of the lower and middle mold body and the two insert rods inserted into the corresponding second slots.

[0028] Figure 4 yes Figure 2 A schematic diagram of the structure of the first molding insert, the second slider, the first molding block, the first drive unit, the third slider, the second drive unit, and the limiting post in the mold closing state.

[0029] Figure 5 yes Figure 4 A partial sectional view of the shaped insert.

[0030] Figure 6 yes Figure 5 A schematic diagram of the structure of the second slider and the first forming block.

[0031] Figure 7 yes Figure 6 A cross-sectional view of the second slider and the first forming block along line AA.

[0032] Figure 8 yes Figure 7 A magnified view of a section at point B in the middle.

[0033] Figure 9 yes Figure 6 Schematic diagram of the structure of the first assembly block, the first molding block, the pressure plate, and the rubber airbag.

[0034] Figure 10 yes Figure 6 A schematic diagram of the structure of the first assembly block.

[0035] Figure 11 yes Figure 6 A schematic diagram of the structure of the first molding block.

[0036] Figure 12 yes Figure 5 Schematic diagram of the first drive unit Figure 13 yes Figure 4 A partial sectional view of the shaped insert.

[0037] Figure 14 yes Figure 13 A magnified view of a section at point C.

[0038] Figure 15 yes Figure 13A schematic diagram of the structure of the third slider, the core-pulling block, and the third inclined groove.

[0039] Figure 16 yes Figure 13 A schematic diagram of the structure of the middle insertion rod and the inclined insertion block.

[0040] Reference numerals: 1. Upper mold body; 11. Upper fixed plate; 12. Fixed template; 121. Limiting post; 2. Lower mold body; 21. Lower fixed plate; 22. Mold foot; 23. Moving template; 231. First slot; 3. Molding insert; 31. Third slide groove; 32. Fourth slide groove; 33. Mounting groove; 34. Second molding cavity; 35. Fifth slide groove; 36. Connecting groove; 37. Second slot; 4. Second slider; 41. First molding groove; 42. First slide groove; 43. Second slide groove; 44. First assembly block; 45. Second assembly block; 46. Cavity; 47. Venting cavity; 48. Venting groove; 49. Rubber airbag; 5. First molding block; 51. First inclined groove; 52. 53. Slider; 54. Second forming block; 55. Limiting block; 56. Second inclined groove; 57. Pressure plate; 68. First drive unit; 69. Pull rod; 60. Pull block; 61. Hydraulic cylinder; 70. Third slider; 71. Core pulling block; 72. Third inclined groove; 73. Mounting block; 81. Second drive unit; 82. Insert rod; 83. Inclined insert block; 9. Spring; 10. Bracket body; 110. Fixing rib; 111. Lamp bead mounting base; 121. Assembly groove; 132. Slot; 133. First forming cavity; 142. First plane; 134. Guide inclined surface; 155. Second plane; 166. First wear-resistant block; 177. Second wear-resistant block; 188. Limiting rod; 199. Connecting block. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this application can be more easily understood and mastered.

[0042] Reference Figure 2 This embodiment of a micro core-pulling injection mold for a plastic car headlight bracket includes an upper mold body 1 and a lower mold body 2. The upper mold body 1 includes an upper fixed plate 11 and a fixed template 12. The lower mold body 2 includes a lower fixed plate 21, a plurality of mold feet 22 fixed on the lower fixed plate 21, a movable template 23 fixed on the plurality of mold feet 22, and an ejection mechanism. The ejection mechanism includes two top plates and a plurality of ejector pins fixed on the top plates (the ejection mechanism is not shown in the figure).

[0043] Reference Figures 2-6 , Figures 9-11The moving template 23 is provided with two forming inserts 3 for forming the bracket body 10. A fourth sliding groove 32 is formed on each forming insert 3, and a second slider 4 for forming the lamp bead mounting base 102 is slidably connected within the fourth sliding groove 32. A first forming groove 41 is formed on the top of the second slider 4, and a first sliding groove 42 is formed on the bottom wall of the first forming groove 41. A first forming block 5 is slidably connected within the first sliding groove 42. Two first inclined grooves 51 are formed on the side wall of the first forming block 5. The distance between the two first inclined grooves 51 gradually increases from their top to their bottom, and the width of both first inclined grooves 51 gradually decreases from their bottom to their opening.

[0044] Reference Figures 6-11 Each of the two first inclined grooves 51 has a first slider 52 slidably connected within it. Each of the two first sliders 52 has a second forming block 53 for forming the slot 104 on its opposite side. Two second grooves 43 are formed on the sidewall of the first groove 42 along a direction perpendicular to its length. Each of the two first sliders 52 has a limiting block 54 at its bottom, which is slidably connected within the two second grooves 43. When the mold is closed, the first forming block 5 extends into the first forming groove 41, forming a first forming cavity 131 between the first forming block 5 and the first forming groove 41 for forming the lamp bead mounting base 102. The two second forming blocks 53 are located within the first forming cavity 131.

[0045] Reference Figure 6 and Figure 10 The second slider 4 includes a first assembly block 44 and a second assembly block 45, which are bolted together to form the second slider 4. Two second sliding grooves 43 are located on the first assembly block 44 and the second assembly block 45 respectively. Both the first forming groove 41 and the first sliding groove 42 are partially located on the first assembly block 44 and partially on the second assembly block 45. A cavity 46 is formed on the interconnected side of the first assembly block 44 and the second assembly block 45. When the first assembly block 44 and the second assembly block 45 are connected, the two cavities 46 communicate with each other to form an exhaust cavity 47. An exhaust groove 48 communicating with the first forming cavity 131 is formed on the bottom wall of the exhaust cavity 47.

[0046] Reference Figure 6 , Figure 9 , Figure 10 The exhaust chamber 47 is connected to the first slide groove 42. A rubber air bag 49 is fixedly connected to the bottom wall of the exhaust chamber 47. The air outlets of the rubber air bag 49 are all located at the lower end of the rubber air bag 49 and are connected to the exhaust groove 48. A pressure plate 56 is provided on the first molding block 5. The pressure plate 56 extends into the exhaust chamber 47 and is connected to the top of the rubber air bag 49. When the mold is closed, the two pressure plates 56 abut against the top walls of the two exhaust chambers 47 respectively.

[0047] Reference Figures 2-5 , Figure 12 The moving template 23 is also provided with a first driving part 6 for driving the first forming block 5 to move. The first driving part 6 includes a pull rod 61, a pull block 62 provided on the pull rod 61, and a hydraulic cylinder 63. The forming insert 3 is provided with a third slide groove 31 that communicates with the fourth slide groove 32, wherein the first slide groove 42 also communicates with the third slide groove 31. The pull rod 61 is slidably connected in the third slide groove 31. The hydraulic cylinder 63 is fixed on the moving template 23 and is used to drive the pull rod 61 to move. The output shaft of the hydraulic cylinder 63 is fixedly connected to the pull rod 61. The distance between the pull block 62 and the lower fixed plate 21 gradually decreases from the end near the oil cylinder 63 to the end far from the oil cylinder 63. The bottom end of the first forming block 5 extends into the third sliding groove 31. The bottom end of the first forming block 5 is provided with a second inclined groove 55. The inclination angle of the second inclined groove 55 is the same as the inclination angle of the pull block 62. The pull block 62 is slidably connected in the second inclined groove 55. When the mold is closed, the end of the pull block 62 near the oil cylinder 63 is located in the second inclined groove 55.

[0048] Reference Figure 12 The pull rod 61 has a first plane 132, a guide slope 133, and a second plane 134. The guide slope 133 connects the first plane 132 and the second plane 134. The inclination angle of the guide slope 133 is the same as the inclination angle of the pull block 62. The first plane 132 is located between the second plane 134 and the oil cylinder 63. When the mold is closed, the bottom end of the second slider 4 abuts against the first plane 132.

[0049] Reference Figure 5 , Figure 6 , Figure 13 The bottom sides of the second slider 4 are respectively equipped with a first wear-resistant block 135 and a second wear-resistant block 136. The two ends of the first wear-resistant block 135 are connected to the first assembly block 44 and the second assembly block 45, respectively. The two ends of the second wear-resistant block 136 are also connected to the first assembly block 44 and the second assembly block 45, respectively. The first wear-resistant block 135 is used to abut against the first plane 132, the second plane 134 and the guide slope 133. The side wall of the third slide groove 31 is also provided with an installation groove 33. The installation groove 33 is located below and connected to the fourth slide groove 32. A connecting block 138 is fixed in the installation groove 33. A limiting rod 137 is fixed on the connecting block 138. The limiting rod 137 is located on the movement path of the second slider 4. The top surface of the limiting rod 137 is flush with the second plane 134. The first wear-resistant block 135 is made of graphite copper material and has excellent self-lubricating properties.

[0050] Reference Figure 3 , Figure 4 , Figure 12Two limiting posts 121 are fixedly connected to the fixed template 12. The moving template 23 has two first slots 231 for the insertion of the limiting posts 121. When the mold is closed, the two limiting posts 121 are inserted into the two first slots 231. The bottom end of the limiting post 121 is located on the side of the pull rod 61 near the oil cylinder 63, and the bottom end of the limiting post 121 abuts against the pull rod 61.

[0051] Reference Figure 13 and Figure 14 The molding insert 3 has a second molding cavity 34 for molding the fixing rib 101. The molding insert 3 has a plurality of fifth sliding grooves 35. The molding insert 3 also has a plurality of connecting grooves 36 connecting the plurality of fifth sliding grooves 35 and the second molding cavity 34. Each of the plurality of fifth sliding grooves 35 is slidably connected to a third slider 7. Each of the plurality of third sliders 7 is provided with a core-pulling block 71 for molding the assembly groove 103. The plurality of core-pulling blocks 71 are slidably connected to the plurality of connecting grooves 36 respectively.

[0052] Reference Figures 13-16 The fixed template 12 is also provided with several second drive units 8 for controlling the movement of the third sliders 7. The second drive unit 8 includes a rod 81 fixedly connected to the fixed template 12 and an inclined block 82 fixed to the bottom of the rod 81. Each of the third sliders 7 is provided with a third inclined groove 72 for the inclined block 82 to be inserted. The distance from the third inclined groove 72 to the lower fixed plate 21 gradually decreases from the end near the second molding cavity 34 to the end away from the second molding cavity 34. Each of the third inclined grooves 72 corresponds to a number of inclined blocks 82. The inclination angle of each of the inclined blocks 82 is the same as the inclination angle of the corresponding third inclined groove 72. Each of the fifth slide grooves 35 has a second slot 37 on its side wall along the mold opening direction. When the mold is closed, the rods 81 are inserted into the second slots 37, the inclined blocks 82 are inserted into the third inclined grooves 72 respectively, and the ends of the core pullers 71 away from the corresponding third sliders 7 extend into the second molding cavity 34.

[0053] Reference Figures 13-16 Each of the third sliders 7 is fitted with a mounting block 73, and each of the fifth slide grooves 35 is fitted with a spring 9. One end of each spring 9 abuts against the side wall of the fifth slide groove 35 near the second forming cavity 34, and the other end of each spring 9 abuts against the mounting block 73. The springs 9 are always in a compressed state. When the mold opens, the springs 9 press the third sliders 7 against the side wall of the fifth slide groove 35 away from the corresponding connecting groove 36. The ends of the inclined inserts 82 near the moving template 23 are located on the movement path of the third inclined grooves 72.

[0054] Reference Figures 2-16 The specific injection molding process of the mold in this embodiment is as follows: First, use a gantry crane to fix the mold on the injection molding machine. Then, the injection molding machine controls the upper mold body 1 and the lower mold body 2 to separate and checks whether the molded parts such as the second slider 4 can move normally. Then, the injection molding machine controls the lower mold body 2 to move toward the upper mold body 1.

[0055] During the mold closing process, several inclined inserts 82 will be inserted into several third inclined slots 72 respectively. Then, as the moving template 23 continues to move, several inclined inserts 82 will be further inserted into the third inclined slots 72 and push several third sliders 7 to move toward the second molding cavity 34. During the movement of several third sliders 7, several springs 9 are compressed and several core-pulling blocks 71 move into the second molding cavity 34.

[0056] During the mold closing process, two limiting posts 121 are inserted into the two first slots 231. The limiting posts 121 restrict the movement of the pull rod 61, thus preventing the second slider 4 and the first molding block 5 from retracting due to injection pressure during mold injection, preventing a step difference between the lamp bead mounting base 102 and the bracket body 10. After the mold is fully closed, the injection molding machine can begin injecting hot melt plastic into the mold to form the product.

[0057] After the product is formed, the injection molding machine controls the lower mold body 2 to move away from the upper mold body 1, causing the mold to open. During this process, several inclined inserts 82 will disengage from several third inclined grooves 72, causing several third sliders 7 to move away from the second molding cavity 34. When the several third sliders 7 move away from the second molding cavity 34, they will drive several core-pulling blocks 71 to move away from the second molding cavity 34, thereby releasing the undercut structure between the several core-pulling blocks 71 and the several assembly grooves 103. When the mold is fully opened, several springs 9 will press several third sliders 7 against the side walls of several fifth sliding grooves 35 away from the corresponding connecting grooves 36, so that when the mold closes again, several inclined inserts 82 can be smoothly inserted into several third inclined grooves 72. During the mold opening process, two limiting posts 121 will also disengage from two first slots 231.

[0058] After the mold is fully opened, the hydraulic cylinder 63 pulls the pull rod 61 away from the third slide groove 31. Under the limitation of the first plane 132, the second slider 4 is in a stationary state, while the pull block 62 will drive the first forming block 5 to move into the first slide groove 42. With the cooperation of the two limiting blocks 54 and the two second slide grooves 43, when the first forming block 5 moves into the first slide groove 42, it will drive the two first sliders 52 to move closer to each other through the two first inclined grooves 51. When the two first sliders 52 move closer to each other, the two second forming blocks 53 will also move away from the two slots 104. Finally, the two second forming blocks 53 will completely disengage from the two slots 104, releasing the undercut structure between the slots 104 and the second forming blocks 53.

[0059] When the first molding block 5 moves into the first slide groove 42 synchronously, the first molding block 5 will drive the two rubber air bags 49 to compress through the two pressure plates 56. When the two rubber air bags 49 are compressed, they will force air through the two exhaust grooves 48 into the space between the lamp bead mounting base 102 and the second slider 4, thereby releasing the adhesion between the lamp bead mounting base 102 and the second slider 4, so that the second slider 4 is less likely to damage the lamp bead mounting base 102 when it moves.

[0060] After the second molding block 53 disengages from the two slots 104, the second slider 4 will come into contact with the guide slope 133. As the pull rod 61 continues to move, under the combined action of the guide slope 133 and the pull block 62, the second slider 4 and the first molding block 5 will remain relatively stationary. However, the second slider 4 will move into the fourth slide groove 32, causing the second slider 4 to move away from the lamp bead mounting base 102. Finally, the first wear-resistant block 135 will move onto the second plane 134, and the second wear-resistant block 136 will abut against the limit rod 137. At this time, the second slider 4 completely disengages from the lamp bead mounting base 102, and the undercut structure between the second slider 4 and the lamp bead mounting base 102 is completely released, allowing the lamp bead mounting base 102 to be demolded smoothly.

[0061] Next, the ejection mechanism is activated to eject the injection-molded bracket body 10 from the molding insert 3. The injection molding operator can then remove the injection-molded bracket body 10 from the mold. After the bracket body 10 is removed from the mold, the hydraulic cylinder 63 pushes the pull rod 61 to reset. During the reset process, the second slider 4 and the first molding block 5 reset together. The second slider 4 first moves to the first plane 132, at its initial position, but the first molding block 5 has not yet reached its initial position. Then, as the pull rod 61 continues to reset, through the cooperation of the pull block 62 and the second inclined groove 55, the first molding block 5 moves into the first molding groove 41 and finally resets. During the reset process of the first molding block 5, the two first sliders 52 and the two rubber airbags 49 also reset. After all components have reset, the injection molding machine can re-control the mold closing to perform the next set of bracket bodies 10 injection molding.

[0062] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A micro core-pulling injection mold for a plastic car light bracket, comprising an upper mold body (1) and a lower mold body (2), wherein the upper mold body (1) comprises an upper fixed plate (11) and a fixed template (12), and the lower mold body (2) comprises a lower fixed plate (21), a plurality of mold feet (22), a movable template (23) and an ejection mechanism, wherein the movable template (23) is provided with a molding insert (3) for molding the bracket body (10), characterized in that: The molding insert (3) has a first molding groove (41) and a first sliding groove (42) on the bottom wall of the first molding groove (41). A first molding block (5) is slidably connected in the first sliding groove (42). Two first inclined grooves (51) are opened on the side wall of the first molding block (5). The distance between the two first inclined grooves (51) gradually increases from their top ends to their bottom ends. The width of the two first inclined grooves (51) gradually decreases from their bottom ends to their opening ends. A first slider (52) is slidably connected in both of the two first inclined grooves (51). A second molding groove (104) is provided on the side of the two first sliders (52) that are far apart from each other. The first slide (42) has two second slides (43) on its side wall. The bottom of each of the two first slide blocks (52) is provided with a limiting block (54). The two limiting blocks (54) are slidably connected in the two second slides (43). The moving template (23) is also provided with a first driving part (6) for driving the first forming block (5) to move. When the mold is closed, the first forming block (5) extends into the first forming groove (41). The first forming block (5) and the first forming groove (41) form a first forming cavity (131) for forming the lamp bead mounting base (102). The two second forming blocks (53) are located in the first forming cavity (131). The first driving unit (6) includes a pull rod (61), a pull block (62) provided on the pull rod (61), and a hydraulic cylinder (63). The molding insert (3) is provided with a third groove (31) that communicates with the first groove (42). The pull rod (61) is slidably connected in the third groove (31). The hydraulic cylinder (63) is provided on the moving template (23) and is used to drive the pull rod (61) to move. The distance from the pull block (62) to the lower fixed plate (21) gradually decreases from the end near the hydraulic cylinder (63) to the end away from the hydraulic cylinder (63). The bottom end of the first molding block (5) extends into the third groove (31). The bottom end of the first molding block (5) is provided with a second inclined groove (55). The pull block (62) is slidably connected in the second inclined groove (55). When the mold is closed, the end of the pull block (62) near the hydraulic cylinder (63) is located in the second inclined groove (55). The molding insert (3) is provided with a fourth slide groove (32) that connects to the third slide groove (31). The second slide block (4) is slidably connected in the fourth slide groove (32). The first molding groove (41), the first slide groove (42), and the two second slide grooves (43) are all provided on the second slide block (4). The pull rod (61) is provided with a first plane (132), a guide slope (133), and a second plane (134). The guide slope (133) connects the first plane (132) and the second plane (134). The inclination angle of the guide slope (133) is the same as the inclination angle of the pull block (62). The first plane (132) is located between the second plane (134) and the oil cylinder (63). When the mold is closed, the bottom end of the second slide block (4) abuts against the first plane (132).

2. The miniature core-pulling injection mold for a plastic car headlight bracket according to claim 1, characterized in that: The bottom end of the second slider (4) is provided with a first wear-resistant block (135) and a second wear-resistant block (136) on both sides respectively. The first wear-resistant block (135) is used to abut against the first plane (132), the second plane (134) and the guide slope (133). The side wall of the third slide groove (31) is also provided with an installation groove (33). The installation groove (33) is located below the fourth slide groove (32) and is connected to the fourth slide groove (32). The installation groove (33) is provided with a limiting rod (137). The limiting rod (137) is located on the movement path of the second slider (4). The top surface of the limiting rod (137) is flush with the second plane (134).

3. A micro-acting injection mold for plastic vehicle lamp support according to claim 1, characterized in that: The second slider (4) includes a first assembly block (44) and a second assembly block (45). Two second slide grooves (43) are located on the first assembly block (44) and the second assembly block (45) respectively. A cavity (46) is provided on the side of the first assembly block (44) and the second assembly block (45) that are connected to each other. When the first assembly block (44) and the second assembly block (45) are connected to each other, the two cavities (46) are connected to each other to form an exhaust cavity (47). An exhaust groove (48) that connects to the first forming cavity (131) is provided on the bottom wall of the exhaust cavity (47).

4. The micro-acting injection mold for a plastic vehicle lamp support according to claim 3, characterized in that: The exhaust chamber (47) is connected to the first slide groove (42). A rubber air bag (49) is fixedly connected to the bottom wall of the exhaust chamber (47). The air outlet of the rubber air bag (49) is connected to the exhaust groove (48). A pressure plate (56) is provided on the first molding block (5). The pressure plate (56) is connected to the top of the rubber air bag (49). When the mold is closed, the pressure plate (56) abuts against the top wall of the exhaust chamber (47).

5. A micro-acting injection mold for plastic vehicle lamp support according to claim 1, characterized in that: The fixed template (12) is provided with a limiting post (121), and the moving template (23) is provided with a first slot (231) for the limiting post (121) to be inserted. When the mold is closed, the limiting post (121) is inserted into the first slot (231). The bottom end of the limiting post (121) is located on the side of the pull rod (61) near the oil cylinder (63), and the bottom end of the limiting post (121) abuts against the pull rod (61).

6. A micro-acting injection mold for plastic vehicle lamp support according to claim 1, characterized in that: The molding insert (3) is provided with a second molding cavity (34) for molding the fixing rib (101). The molding insert (3) is provided with a plurality of fifth sliding grooves (35). The molding insert (3) is also provided with a plurality of connecting grooves (36) connecting the plurality of fifth sliding grooves (35) and the second molding cavity (34). A third slider (7) is slidably connected in each of the plurality of fifth sliding grooves (35). A core-pulling block (71) for molding the assembly groove (103) is provided on each of the plurality of third sliders (7). The core-pulling blocks (71) are slidably connected in the plurality of connecting grooves (36). The fixed template (12) is also provided with a plurality of second driving parts (8) for controlling the movement of the third sliders (7).

7. A micro-acting injection mold for a plastic vehicle lamp support according to claim 6, characterized in that: The second drive unit (8) includes a rod (81) and an inclined insert (82) disposed at the bottom of the rod (81). Each of the third sliders (7) has a third inclined groove (72) for inserting the inclined insert (82). The distance from the third inclined groove (72) to the lower fixing plate (21) gradually decreases from the end near the second molding cavity (34) to the end away from the second molding cavity (34). Each of the third inclined grooves (72) corresponds one-to-one with a number of inclined inserts (82). The inclination of each of the inclined inserts (82) is... The angle of the oblique angle is the same as the inclination angle of the corresponding third oblique groove (72). The side walls of the fifth sliding groove (35) are provided with second slots (37) along the mold opening direction. The top of the insert rod (81) is fixed on the fixed template (12). When the mold is closed, the insert rods (81) are inserted into the second slots (37), the oblique inserts (82) are inserted into the third oblique grooves (72), and the ends of the core-pulling blocks (71) away from the corresponding third slider (7) are all inserted into the second molding cavity (34).

8. A micro-acting injection mold for plastic vehicle lamp support according to claim 7, characterized in that: Each of the third sliders (7) is fitted with an mounting block (73), and each of the fifth slides (35) is fitted with a spring (9). One end of each spring (9) abuts against the side wall of the fifth slide (35) near the second forming cavity (34), and the other end of each spring (9) abuts against the mounting block (73). The springs (9) are always in a compressed state. When the mold is opened, the springs (9) press the third sliders (7) against the side wall of the fifth slide (35) away from the corresponding connecting groove (36). The ends of the inclined inserts (82) near the moving template (23) are located on the movement path of the third inclined grooves (72).

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