Oblique tripping mechanism for injection mold of automobile plastic part

Abstract

The invention relates to an automobile plastic part injection mold oblique tripping mechanism which comprises a core pulling block used for forming an inverted buckle and a pouring gate arranged on the core pulling block, the pouring gate comprises a main runner and a submarine ox horn runner, the main runner is used for bearing hot melt plastic, and the submarine ox horn runner is used for bearing the hot melt plastic. The ox horn runner is communicated with the main runner and a cavity used for forming an inverted buckle on the mold, a mounting cavity is formed in the core-pulling block, a mounting seat is connected in the mounting cavity in a sliding manner, a communicating hole communicated with the mounting cavity and the main runner is formed in the core-pulling block, an ejector rod is arranged on the mounting seat and extends into the communicating hole, and the ejector rod is connected with the mounting seat in a sliding manner. A first control mechanism is arranged on the core pulling block and used for controlling the installation base to slide so as to drive the ejector rod to move into the main runner. While it is guaranteed that the automobile plastic part inverted buckle is completely formed, waste and the inverted buckle are automatically separated when the mold is opened, the inverted buckle is prevented from being pulled, and therefore the side contour edge of the inverted buckle is prevented from being pulled and deformed.

Description

Technical Field

[0001] The invention relates to the field of molds, in particular to an oblique release mechanism of an injection mold for automobile plastic parts. Background Art

[0002] Undercut structures are often designed on automotive plastic parts so that they can be assembled with each other. In the injection mold of automotive plastic parts, oblique core pullers are often used to form the undercut structures on automotive plastic parts. After the product is injection molded, the oil cylinder is used to drive the core puller to slide away from the molded undercut, so that the injection molded plastic parts can be demolded smoothly.

[0003] In order to ensure the integrity of the undercut molding of automotive plastic parts, a gate specifically used to mold the undercut structure will be directly set on the core pulling block during mold design, allowing the hot melt plastic to flow directly through the gate into the cavity of the mold for molding the undercut structure.

[0004] The gate is opened to form the undercut structure, but the hot melt plastic remaining in the gate will become waste, which is directly connected to the undercut after molding. When the core pulling block slides, it will directly pull the waste away from the undercut, so that the connection between the waste and the undercut is directly broken, thereby separating the waste and the undercut. The strong pulling separation method of the undercut and the waste is easy to damage the undercut, making it easy for the undercut to lose a piece, so how to separate the undercut and the waste without damaging the undercut becomes a problem. Summary of the invention

[0005] The present application provides an oblique release mechanism for an injection mold for automobile plastic parts, which ensures that the undercut molding of the automobile plastic parts is complete, separates waste materials and undercuts when the mold is opened, and prevents the undercuts from being torn.

[0006] The oblique release mechanism of the automotive plastic injection mold provided in this application adopts the following technical solution: An oblique release mechanism for an injection mold for automobile plastic parts, comprising a core pulling block for forming undercuts and a gate arranged on the core pulling block, the gate comprising a main flow channel and a latent bull horn flow channel, the main flow channel is used to receive hot-melt plastic, the bull horn flow channel connects the main flow channel and a cavity on the mold for forming undercuts, the core pulling block is provided with a mounting cavity, a mounting seat is slidably connected in the mounting cavity, a connecting hole connecting the mounting cavity and the main flow channel is opened on the core pulling block, the mounting seat is provided with a push rod, the push rod extends into the connecting hole, the core pulling block is provided with a first control mechanism, the first control mechanism is used to control the sliding of the mounting seat to drive the push rod to move into the main flow channel.

[0007] By adopting the above technical solution, after the undercut is injection molded, the first control mechanism controls the mounting seat to slide close to the main channel to allow the ejector rod to move into the main channel, so that the ejector rod pushes the waste material in the main channel out of the main channel. When the waste material in the main channel is ejected, it will move with the waste material in the horn flow channel. At this time, the flow channel opening of the horn flow channel that is not connected to the main channel will play a role in cutting and guiding, so that the waste material and the undercut are broken and separated at the flow channel opening of the horn flow channel that is not connected to the main channel. By actively controlling the broken part of the waste material and the undercut, it is prevented that the waste material pulls off a part of the undercut when the waste material is separated from the undercut, and the probability of the undercut being pulled when the waste material is separated from the undercut is reduced.

[0008] Preferably, the first control mechanism includes a nitrogen spring arranged on the core pulling block and a limit rod arranged in the mounting cavity, the mounting seat is located between the limit rod and the nitrogen spring, the nitrogen spring is located on the side of the mounting seat away from the main flow channel, the output shaft of the nitrogen spring is connected to the mounting seat, the nitrogen spring always drives the mounting seat to move toward the main flow channel, one end of the limit rod is connected to the mounting seat, and the other end of the limit rod extends out of the core pulling block. When the mold is closed, the fixed mold of the mold will press the limit rod so that the mounting seat conflicts with the side wall of the mounting cavity away from the main flow channel and the nitrogen spring is compressed.

[0009] By adopting the above technical solution, when the mold is opened, the fixed mold of the mold is separated from the movable mold of the mold, and the fixed mold of the mold no longer presses the limit rod, and the nitrogen spring is no longer pressed. Therefore, the nitrogen spring will rebound and drive the mounting seat to slide toward the main channel, allowing the ejector rod to directly push the waste material out of the main channel, and the separation of the waste material and the undercut is completed before the core pulling block moves away from the undercut. During the mold closing process, the fixed mold of the mold will press the limit rod and drive the limit rod to move into the installation cavity. When the limit rod moves into the installation cavity, it will drive the mounting seat to move away from the main channel and cause the nitrogen spring to be compressed.

[0010] Preferably, the core pulling block is provided with a first sliding cavity, a sliding block 1 is slidingly connected in the first sliding cavity, a first sliding groove connecting the first sliding cavity and the bull horn flow channel is opened on the core pulling block, a cutting knife is provided on the sliding block 1, and the cutting knife extends into the first sliding groove, and a second control mechanism is also provided on the core pulling block, and the second control mechanism is used to control the sliding of the sliding block 1 so that the cutting knife moves into the bull horn flow channel.

[0011] By adopting the above technical solution, after the undercut is injection molded, the second control mechanism controls the sliding block to slide close to the bull horn flow channel so that the cutting knife moves into the bull horn flow channel to cut off the waste material in the bull horn flow channel, directly separating the waste material and the undercut, so that the undercut will not be damaged when the waste material is separated from the undercut.

[0012] Preferably, a second sliding cavity is provided on the core pulling block, the second sliding cavity is located on the side of the first sliding cavity away from the bull-horn flow channel, the first sliding cavity is connected to the second sliding cavity, the second sliding cavity is connected to the installation cavity, the second control mechanism includes a sliding block 2 slidingly connected to the second sliding cavity, a first guiding slope provided on the sliding block 2, a second control component for controlling the sliding of the sliding block 2, and a first spring arranged in the first sliding cavity, the end of the sliding block 1 away from the bull-horn flow channel is in contact with the first guiding slope, and when the sliding block 2 slides away from the installation cavity, the sliding block 1 is driven to slide toward the bull-horn flow channel through the cooperation of the first guiding slope and the sliding block 1, the first spring is located on the side of the sliding block 1 away from the sliding block 2, the elastic force of the first spring acts on the sliding block 1, and the first spring always drives the sliding block 1 to move toward the sliding block 2 so that the sliding block 1 always fits the first guiding slope.

[0013] By adopting the above technical solution, when the second control component controls the sliding block 2 to slide away from the installation cavity, it can drive the sliding block 1 to slide close to the horn flow channel and cause the first spring to be compressed. When the second control component controls the sliding block 2 to slide close to the installation cavity, the first spring will rebound and drive the sliding block 1 to move away from the horn flow channel, completing the movement reset of the sliding block 1.

[0014] Preferably, the second sliding cavity is connected to the mounting cavity, and the second control component includes a second guiding bevel provided on the mounting seat and a second spring provided in the second sliding cavity, one end of the sliding block 2 extends into the mounting cavity and fits with the second guiding bevel, and when the mounting seat moves close to the main flow channel, the sliding block 2 is driven to slide into the second sliding cavity through the cooperation between the second guiding bevel and the sliding block 2, and the second spring is located on the side of the sliding block 2 away from the mounting cavity, and the elastic force of the second spring acts on the sliding block 2, and the second spring always drives the sliding block 2 to move toward the mounting cavity so that the sliding block 2 always conflicts with the mounting seat.

[0015] By adopting the above technical solution, when the mounting seat slides toward the main flow channel, it will drive the sliding block 2 to move into the second sliding cavity and cause the second spring to be compressed. When the sliding block 2 moves into the second sliding cavity, it will drive the sliding block 1 to move toward the bullhorn flow channel and cause the first spring to be compressed. During the movement and resetting process of the mounting seat, the second guiding slope will gradually move to a position facing the second sliding cavity. Once the second guiding slope begins to dock with the second sliding cavity, the second spring will rebound and push the sliding block 2 to move into the installation cavity and make the sliding block 2 and the second guiding slope contact and fit. When the sliding block 2 moves into the installation cavity, the first spring will rebound and push the sliding block 1 to move away from the bullhorn flow channel.

[0016] Preferably, a guide cavity is opened in the mounting seat, and one end of the push rod away from the main channel extends into the guide cavity, and a push-pull column is provided on the end of the push rod extending into the guide cavity. The push-pull column is slidably connected in the guide cavity, and the diameter of the push-pull column is larger than the diameter of the push rod. In the initial state, the push-pull column conflicts with the side wall of the guide cavity close to the main channel, and the push-pull column does not contact the side wall of the guide cavity away from the main channel. When the mounting seat drives the sliding block 2 to completely slide into the second sliding cavity, the push-pull column contacts the side wall of the guide cavity away from the main channel.

[0017] By adopting the above technical solution, when the mounting seat moves close to the main flow channel, the mounting seat will first drive the sliding block 2 to move away from the mounting cavity, and finally make the cutting knife move into the bullhorn flow channel to cut off the waste material in the bullhorn flow channel. The waste material is directly cut off before the ejector rod ejects the waste material, thereby effectively avoiding the phenomenon of the waste material being ejected, pulled and buckled. When the mounting seat finally drives the sliding block 2 to completely slide into the second sliding cavity, the push-pull column moves to contact the side wall of the guide cavity away from the main flow. After the subsequent mounting seat continues to move, it will push the push-pull column and the ejector rod to move together, so that the ejector rod will eject the waste material cut off in the main flow channel and the bullhorn flow channel out of the core pulling block.

[0018] Preferably, a sliding block three is slidingly connected to the core pulling block, and the sliding block three and the core pulling block together form a bullhorn flow channel. A third control mechanism is also provided on the core pulling block, and the third control mechanism is used to control the sliding block three to move away from the core pulling block.

[0019] By adopting the above technical solution, after the waste in the bullhorn flow channel is cut off, the third control mechanism controls the sliding block to slide three times, so that the space of the bullhorn flow channel becomes larger, and the undercut structure between the waste in the bullhorn flow channel and the bullhorn flow channel is released, so that the waste in the bullhorn flow channel is not easy to break in the bullhorn flow channel when the waste is ejected from the core-pulling block. At the same time, when the core-pulling block moves away from the undercut, a small part of the waste connected to the undercut will not be pulled off due to the undercut structure of the bullhorn flow channel, and the undercut of the automobile plastic parts is protected, and a small part of the waste connected to the undercut of the automobile plastic parts can be manually repaired later.

[0020] Preferably, a second sliding groove connected to the bull horn flow channel is provided on the sliding block three, and the cutting knife extends into the second sliding groove, and a third sliding groove is provided on the side wall of the second sliding groove, and the third control mechanism includes a through groove provided on the cutting knife, a limit block slidably connected in the third sliding groove, a third inclined surface provided on the end of the limit block away from the bull horn flow channel, and a third spring provided in the third sliding groove, and the elastic force of the third spring acts on the limit block, and the third spring always drives the limit block to move toward the second sliding groove, the through groove is connected to the bull horn flow channel and becomes a part of the bull horn flow channel, and the through groove will be connected with the third sliding groove during the process of moving away from the second sliding cavity, and when the through groove moves to be connected with the third sliding groove, the third spring pushes the end of the limit block close to the second sliding groove into the through groove; during the process of resetting the cutting knife movement, the third inclined surface is pressed to drive the sliding block three located in the through groove to move into the third sliding groove.

[0021] By adopting the above technical solution, during product injection molding, the through groove will become a part of the horn runner, ensuring the smoothness of the horn runner. When the sliding block one moves close to the horn runner, it will drive the cutting knife to move together so that the through groove moves into the second sliding groove. When the through groove moves into the second sliding groove, the through groove will act as a cutter and directly cut off the waste material in the horn runner. Then, when the through groove moves to be connected with the third sliding groove, the third spring will push the end of the limit block into the through groove. Then the through groove will continue to move and move with the limit block and sliding block three, so that sliding block three moves away from the core, thereby increasing the space of the horn runner and removing the undercut structure between the waste material in the horn runner and the horn runner.

[0022] The technical effects of the present invention are mainly reflected in the following aspects: 1. The present invention controls the movement of the cutting knife so that the waste in the horn flow channel is cut off before it is ejected from the core-pulling block, thereby preventing the waste from being pulled and undercut when it is ejected from the core-pulling block; 2. After the waste is cut off, the cutting knife can move with the sliding block 3 through the cooperation of the through groove and the limit block, so that the horn flow channel becomes larger, which facilitates the separation of the waste in the horn flow channel; 3. The present invention separates waste materials and undercuts when the mold is opened and prevents undercuts from being pulled. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the oblique release mechanism of the automobile plastic injection mold of the present application in the mold closing state.

[0024] Figure 2 yes Figure 1 A top view of the oblique release mechanism of the injection mold for automotive plastic parts.

[0025] Figure 3 yes Figure 2Cross-sectional view of the oblique release mechanism of the injection mold for automobile plastic parts along line AA.

[0026] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle.

[0027] Figure 5 yes Figure 3 A partial enlarged view of point C in the middle.

[0028] Figure 6 yes Figure 2 Cross-sectional view of the oblique release mechanism of the injection mold for automobile plastic parts along the DD line.

[0029] Figure 7 yes Figure 3 A structural schematic diagram when the middle mounting seat pushes the sliding block 2 completely into the second sliding groove.

[0030] Figure 8 yes Figure 7 A partial enlarged view of point E in the middle.

[0031] Fig. 9 yes Figure 7 A partial enlarged view of point F in the middle.

[0032] Fig.10 yes Figure 2 Cross-sectional view of the oblique release mechanism of the injection mold for automobile plastic parts along the GG line.

[0033] Fig.11 yes Fig.10 Schematic diagram of the structure when the middle through groove moves to dock with the third sliding groove.

[0034] Fig.12 yes Fig.11 Schematic diagram of the structure when the middle cutting knife moves to the farthest distance from the second sliding groove.

[0035] Fig.13 yes Fig.12 A schematic diagram of the structure when the limit block is pushed into the third sliding groove during the resetting process of the middle cutting knife.

[0036] Figure numerals: 1. core pulling block; 11. mounting cavity; 12. connecting hole; 13. first sliding cavity; 14. first sliding groove; 15. second sliding cavity; 2. gate; 21. main flow channel; 22. bullhorn flow channel; 3. mounting seat; 31. ejector rod; 32. guide cavity; 33. push-pull column; 4. first control mechanism; 41. nitrogen spring; 42. limit rod; 51. sliding block one; 52. cutting knife; 6. second control mechanism; 61. sliding block two; 62. first guiding slope; 63. second control assembly; 631. second guiding slope; 632. second spring; 64. first spring; 7. sliding block three; 71. second sliding groove; 72. third sliding groove; 8. third control mechanism; 81. through groove; 82. limit block; 83. third slope; 84. third spring. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings to make the technical solution of the present application easier to understand and grasp.

[0038] Reference Figure 1-Figure 4 The oblique release mechanism of the injection mold for automobile plastic parts of the present embodiment includes a core-pulling block 1 for forming undercuts and a gate 2 opened on the core-pulling block 1. The gate 2 includes a main flow channel 21 and a latent bull-horn flow channel 22. The main flow channel 21 is used to receive hot-melt plastic, and the bull-horn flow channel 22 connects the main flow channel 21 and the cavity on the mold for forming undercuts.

[0039] Reference Figure 1-Figure 3 , a mounting cavity 11 is provided in the core pulling block 1, and a mounting seat 3 is slidably connected in the mounting cavity 11 along the vertical direction, and two guide cavities 32 are provided in the mounting seat 3. Two connecting holes 12 connecting the mounting cavity 11 and the main channel 21 are provided on the core pulling block 1, and two ejector rods 31 are provided on the mounting seat 3, one end of the two ejector rods 31 extends into the two guide cavities 32 respectively, and the other end of the two ejector rods 31 extends into the two connecting holes 12 respectively. Push-pull columns 33 are fixed on the ends of the two ejector rods 31 extending into the guide cavities 32, and the push-pull columns 33 are slidably connected in the guide cavities 32 along the vertical direction, and the diameter of the push-pull columns 33 is larger than the diameter of the ejector rods 31. In the mold closing state, the push-pull columns 33 conflict with the side wall of the guide cavity 32 close to the main channel 21, and the push-pull columns 33 do not contact the side wall of the guide cavity 32 away from the main channel 21.

[0040] Reference Figure 1-Figure 3 , Figure 6, a first control mechanism 4 is provided on the core pulling block 1, and the first control mechanism 4 is used to control the sliding of the mounting seat 3 so as to drive the ejector rod 31 to move into the main flow channel 21. The first control mechanism 4 includes a nitrogen spring 41 installed on the core pulling block 1, and two limit rods 42 provided in the mounting cavity 11. The mounting seat 3 is located between the two limit rods 42 and the nitrogen spring 41. The nitrogen spring 41 is located on the side of the mounting seat 3 away from the main flow channel 21. The output shaft of the nitrogen spring 41 is connected to the mounting seat 3, and the nitrogen spring 41 always drives the mounting seat 3 to move toward the main flow channel 21. One end of the two limit rods 42 is connected to the mounting seat 3, and the other end of the two limit rods 42 extends out of the core pulling block 1. When the mold is closed, the fixed mold of the mold will press the two limit rods 42 so that the mounting seat 3 and the side wall of the mounting cavity 11 away from the main flow channel 21 conflict and the nitrogen spring 41 is compressed.

[0041] Reference Figure 3-Figure 5 The core pulling block 1 is provided with a first sliding cavity 13, and a sliding block 51 is slidably connected in the first sliding cavity 13 along the vertical direction. The core pulling block 1 is provided with a first sliding groove 14 connecting the first sliding cavity 13 and the horn flow channel 22, and a cutting knife 52 is fixed on the sliding block 51, and the end of the cutting knife 52 away from the sliding block 51 extends into the first sliding groove 14.

[0042] Reference Figure 3-Figure 5 , Figure 7-Figure 9 The core-pulling block 1 is provided with a second sliding cavity 15, which is located on the side of the first sliding cavity 13 away from the horn flow channel 22, the first sliding cavity 13 is connected to the second sliding cavity 15, and the second sliding cavity 15 is connected to the installation cavity 11. The core-pulling block 1 is also provided with a second control mechanism 6, which is used to control the sliding block 51 to slide so that the cutting knife 52 moves into the horn flow channel 22.

[0043] Reference Figure 3-Figure 5 , Figure 7-Figure 9 The second control mechanism 6 includes a sliding block 61 which is arranged in a horizontal direction and connected to the second sliding cavity 15, a first guiding slope 62 which is provided on the sliding block 61, and a first spring 64 which is arranged in the first sliding cavity 13. The end of the sliding block 151 which is away from the horn flow channel 22 is in contact with the first guiding slope 62. When the sliding block 151 slides away from the installation cavity 11, the first guiding slope 62 cooperates with the sliding block 151 to drive the sliding block 151 to slide toward the horn flow channel 22. The first spring 64 is located on the side of the sliding block 151 which is away from the sliding block 261. The elastic force of the first spring 64 acts on the sliding block 151. The first spring 64 always drives the sliding block 151 to move toward the sliding block 261 so that the sliding block 151 always contacts the first guiding slope 62.

[0044] Reference Figure 3-Figure 5 , Figure 7-Figure 9, the second control mechanism 6 also includes a second control assembly 63 for controlling the sliding movement of the second sliding block 61. The second control assembly 63 includes a second guiding slope 631 provided on one end of the mounting seat 3 close to the second sliding cavity 15, and a second spring 632 provided in the second sliding cavity 15. One end of the second sliding block 61 extends into the mounting cavity 11 and fits with the second guiding slope 631. When the mounting seat 3 moves close to the main flow channel 21, the second sliding block 61 is driven to slide into the second sliding cavity 15 through the cooperation between the second guiding slope 631 and the second sliding block 61. When the mounting seat 3 drives the second sliding block 61 to completely slide into the second sliding cavity 15, the push-pull column 33 contacts the side wall of the guide cavity 32 away from the main flow.

[0045] Reference Figure 3-Figure 5 , Figure 7-Figure 9 The second spring 632 is located on the side of the sliding block 61 away from the mounting seat 3. The elastic force of the second spring 632 acts on the sliding block 61. The second spring 632 always drives the sliding block 61 to move toward the mounting cavity 11 so that the sliding block 61 always conflicts with the mounting seat 3.

[0046] Reference Figure 3-Figure 5 , Figure 7-10 The core pulling block 1 is also connected with a sliding block 3 7 in a vertical sliding direction. The sliding block 3 7 and the core pulling block 1 are combined to form a bull horn flow channel 22. The sliding block 3 7 is provided with a second sliding groove 71 connected to the bull horn flow channel 22. The cutting knife 52 extends into the second sliding groove 71, and a third sliding groove 72 is provided on the side wall of the second sliding groove 71.

[0047] Reference Figure 3-Figure 5 , Figure 7-10 The core-pulling block 1 is also provided with a third control mechanism 8, which is used to control the sliding block 3 7 to move away from the core-pulling block 1 so that the sliding block 3 7 moves away from the plastic waste in the horn flow channel 22. The third control mechanism 8 includes a through groove 81 provided on the cutting knife 52, a limit block 82 slidingly connected in the third sliding groove 72 along the horizontal direction, a third inclined surface 83 provided on one end of the limit block 82 away from the horn flow channel 22, and a third spring 84 provided in the third sliding groove 72.

[0048] Reference Figure 3-Figure 5 , Figure 7-Figure 13, the elastic force of the third spring 84 acts on the limit block 82, and the third spring 84 always drives the limit block 82 to move toward the second sliding groove 71. The through groove 81 is connected to the horn flow channel 22 and becomes a part of the horn flow channel 22. The through groove 81 will be connected with the third sliding groove 72 during the process of moving away from the second sliding cavity 15. When the through groove 81 moves to be connected with the third sliding groove 72, the third spring 84 pushes the end of the limit block 82 close to the second sliding groove 71 into the through groove 81; during the movement and reset process of the cutting knife 52, the cutting knife 52 first presses the third inclined surface 83 to drive the end of the sliding block 73 located in the through groove 81 to move into the third sliding groove 72.

[0049] The release steps of the oblique release mechanism of the automobile plastic part injection mold of the present application are as follows.

[0050] Reference Figure 3 and Figure 5 When automobile plastic parts are produced, the mold is first closed, and then the hot runner will inject the hot flow plastic into the main channel 21, and then the hot flow plastic will flow into the cavity on the mold for forming the undercut through the horn runner 22 to complete the injection molding of the undercut.

[0051] Reference Figure 3-Figure 6 After the inverted injection molding, the mold will be opened. During the mold opening process, the fixed mold of the mold no longer presses the limit rod 42, and the nitrogen spring 41 is no longer under pressure. Therefore, the nitrogen spring 41 will rebound and drive the mounting seat 3 to slide toward the main channel 21.

[0052] Reference Figure 3-Figure 9 When the mounting seat 3 slides toward the main flow channel 21, it will drive the sliding block 2 61 to move into the second sliding cavity 15 and cause the second spring 632 to be compressed. When the sliding block 2 61 moves into the second sliding cavity 15, it will drive the sliding block 1 51 to move toward the bullhorn flow channel 22 and cause the first spring 64 to be compressed.

[0053] Reference Figure 3-Figure 5 , Figure 7-Figure 12 When the sliding block 51 moves close to the horn flow channel 22, it will drive the cutting knife 52 to move together so that the through groove 81 moves into the second sliding groove 71. When the through groove 81 moves into the second sliding groove 71, the through groove 81 will act as a cutter to directly cut off the waste in the horn flow channel 22.

[0054] Reference Figure 3-Figure 5 , Figure 7-Figure 12Then, when the through groove 81 moves to communicate with the third sliding groove 72, the third spring 84 will push the end of the limit block 82 into the through groove 81. Then, the cutting knife 52 will move with the sliding block 3 7 through the cooperation of the through groove 81 and the limit block 82, so that the sliding block 3 7 moves away from the core, thereby increasing the space of the horn flow channel 22 and removing the undercut structure between the waste in the horn flow channel 22 and the horn flow channel 22.

[0055] Reference Figure 3-Figure 5 , Figure 7-Figure 12 , finally, when the mounting seat 3 drives the sliding block 2 61 to completely slide into the second sliding cavity 15, the push-pull column 33 contacts the side wall of the guide cavity 32 away from the main flow, and the sliding block 2 61 and other components also stop moving. Then, the mounting seat 3 will continue to move under the push of the nitrogen spring 41 and push the push-pull column 33 and the push rod 31 to move together, so that the push rod 31 enters the main flow channel 21 to push the waste cut off in the main flow channel 21 and the bullhorn flow channel 22 out of the core pulling block 1, because the space of the bullhorn flow channel 22 becomes larger, so the waste in the bullhorn flow channel 22 is not easy to break when it is pushed out of the bullhorn flow channel 22. Then the oil cylinder on the mold will drive the core pulling block 1 to move away from the undercut, allowing a small part of the waste connected to the undercut to escape from the bullhorn flow channel 22, completing the complete separation of the core pulling block 1 and the undercut.

[0056] Reference Figure 3-Figure 6 After the subsequent automobile plastic part is removed from the mold, the mold will be closed and the injection molding of the next automobile plastic part will be restarted. During the mold closing process, the fixed mold of the mold will press the limit rod 42 and drive the limit rod 42 to move into the installation cavity 11. When the limit rod 42 moves into the installation cavity 11, it will drive the mounting seat 3 to move away from the main channel 21 and cause the nitrogen spring 41 to be compressed and the two ejector rods 31 to move into the two connecting holes 12.

[0057] Reference Figure 3-Figure 6 During the movement and resetting process of the mounting seat 3, the second guiding slope 631 will gradually move to a position facing the second sliding cavity 15. Once the second guiding slope 631 begins to dock with the second sliding cavity 15, the second spring 632 will rebound and push the sliding block 61 to move into the mounting cavity 11 and make the sliding block 61 contact and fit with the second guiding slope 631. When the sliding block 61 moves into the mounting cavity 11, the first spring 64 will rebound and push the sliding block 1 51 to move away from the bullhorn flow channel 22.

[0058] Reference Figure 3-Figure 5 , Fig.13 When the sliding block 1 51 moves away from the horn flow channel 22, the sliding block 1 51 will bring the cutting knife 52 to move and reset so that the through groove 81 moves toward the horn flow channel 22. During the movement and reset process of the through groove 81, the sliding block 3 7 will move close to the core pulling block 1 through the limit block 82.

[0059] Reference Figure 3-Figure 5 , Fig.13 When the sliding block 37 moves to contact with the core-pulling block 1, the sliding block 37 will not move, but the cutting knife 52 will continue to move. The cutting knife 52 will press the third inclined surface 83 to drive the sliding block 37 located in the through groove 81 to move into the third sliding groove 72 and compress the third spring 84. When the sliding block 37 is completely pushed into the third sliding groove 72, the cutting will continue to move close to the horn flow channel 22.

[0060] Reference Figure 3-Figure 5 When the mold is completely closed, the mounting seat 3 will also move to contact the side wall of the mounting cavity 11 away from the main flow channel 21. At this time, the cutting knife 52 and the through groove 81 move to the initial position, and the through groove 81 connects to the horn flow channel 22 and becomes a part of the horn flow channel 22. At the same time, when the mold is closed, the fixed mold of the mold will also press the sliding block 3 7 against the core pulling block 1 to ensure that the sliding block 3 7 can be accurately reset.

[0061] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. An oblique release mechanism for an automobile plastic injection mold, comprising a core-pulling block (1) for forming an undercut, and a gate (2) provided on the core-pulling block (1), characterized in that: The gate (2) comprises a main channel (21) and a latent bull-horn channel (22), wherein the main channel (21) is used to receive hot-melt plastic, and the bull-horn channel (22) is connected to the main channel (21) and a cavity on the mold for forming an undercut, and the core pulling block (1) is provided with a mounting cavity (11), and a mounting seat (3) is slidably connected in the mounting cavity (11), and a connecting hole (12) connecting the mounting cavity (11) and the main channel (21) is opened on the core pulling block (1), and a push rod (31) is provided on the mounting seat (3), and the push rod (31) extends into the connecting hole (12), and the core pulling block (1) is provided with a first control mechanism (4), and the first control mechanism (4) is used to control the sliding of the mounting seat (3) so as to drive the push rod (31) to move into the main channel (21).

2. The oblique release mechanism of an automobile plastic injection mold according to claim 1, characterized in that: The first control mechanism (4) comprises a nitrogen spring (41) arranged on the core pulling block (1) and a limiting rod (42) arranged in the mounting cavity (11); the mounting seat (3) is located between the limiting rod (42) and the nitrogen spring (41); the nitrogen spring (41) is located on a side of the mounting seat (3) away from the main flow channel (21); the output shaft of the nitrogen spring (41) is connected to the mounting seat (3); the nitrogen spring (41) always drives the mounting seat (3) to move toward the main flow channel (21); one end of the limiting rod (42) is connected to the mounting seat (3); the other end of the limiting rod (42) extends out of the core pulling block (1); when the mold is closed, the fixed mold of the mold presses the limiting rod (42) so that the mounting seat (3) and the side wall of the mounting cavity (11) away from the main flow channel (21) are in conflict and the nitrogen spring (41) is compressed.

3. The oblique release mechanism of an automobile plastic injection mold according to claim 2, characterized in that: The core pulling block (1) is provided with a first sliding cavity (13), and a sliding block (51) is slidingly connected in the first sliding cavity (13). The core pulling block (1) is provided with a first sliding groove (14) connecting the first sliding cavity (13) and the horn flow channel (22). The sliding block (51) is provided with a cutting knife (52), and the cutting knife (52) extends into the first sliding groove (14). The core pulling block (1) is also provided with a second control mechanism (6), and the second control mechanism (6) is used to control the sliding of the sliding block (51) so that the cutting knife (52) moves into the horn flow channel (22).

4. The oblique release mechanism of an automobile plastic injection mold according to claim 3, characterized in that: The core-pulling block (1) is provided with a second sliding cavity (15), the second sliding cavity (15) is located on a side of the first sliding cavity (13) away from the horn flow channel (22), the first sliding cavity (13) is connected to the second sliding cavity (15), the second sliding cavity (15) is connected to the installation cavity (11), the second control mechanism (6) comprises a sliding block (61) slidably connected to the second sliding cavity (15), a first guiding inclined surface (62) provided on the sliding block (61), a second control component (63) for controlling the sliding of the sliding block (61), and a first spring (64) provided in the first sliding cavity (13), the sliding block (61) One end of the sliding block 51 away from the horn flow channel (22) is in contact with the first guiding bevel (62); when the sliding block 2 (61) slides away from the mounting cavity (11), the first guiding bevel (62) cooperates with the sliding block 1 (51) to drive the sliding block 1 (51) to slide toward the horn flow channel (22); the first spring (64) is located on the side of the sliding block 1 (51) away from the sliding block 2 (61); the elastic force of the first spring (64) acts on the sliding block 1 (51); the first spring (64) always drives the sliding block 1 (51) to move toward the sliding block 2 (61) so that the sliding block 1 (51) always contacts the first guiding bevel (62).

5. The oblique release mechanism of the automotive plastic injection mold according to claim 4, characterized in that: The second control component (63) comprises a second guiding inclined surface (631) provided on the mounting seat (3) and a second spring (632) provided in the second sliding cavity (15); one end of the second sliding block (61) extends into the mounting cavity (11) and fits with the second guiding inclined surface (631); when the mounting seat (3) moves close to the main flow channel (21), the second sliding block (61) is driven to slide into the second sliding cavity (15) through the cooperation between the second guiding inclined surface (631) and the second sliding block (61); the second spring (632) is located on the side of the second sliding block (61) away from the mounting cavity (11); the elastic force of the second spring (632) acts on the second sliding block (61); the second spring (632) always drives the second sliding block (61) to move toward the mounting cavity (11) so that the second sliding block (61) always contacts with the mounting seat (3).

6. The oblique release mechanism of an automobile plastic injection mold according to claim 5, characterized in that: A guide cavity (32) is provided in the mounting seat (3), and one end of the push rod (31) away from the main channel (21) extends into the guide cavity (32). A push-pull column (33) is provided on the end of the push rod (31) extending into the guide cavity (32). The push-pull column (33) is slidably connected in the guide cavity (32), and the diameter of the push-pull column (33) is larger than the diameter of the push rod (31). In an initial state, the push-pull column (33) is in conflict with the side wall of the guide cavity (32) close to the main channel (21), and the push-pull column (33) is not in contact with the side wall of the guide cavity (32) away from the main channel (21). When the mounting seat (3) drives the sliding block 2 (61) to completely slide into the second sliding cavity (15), the push-pull column (33) is in contact with the side wall of the guide cavity (32) away from the main channel (21).

7. The oblique release mechanism of an automobile plastic injection mold according to claim 6, characterized in that: The core pulling block (1) is slidably connected to a sliding block three (7), and the sliding block three (7) and the core pulling block (1) are combined to form a bullhorn flow channel (22). The core pulling block (1) is also provided with a third control mechanism (8), and the third control mechanism (8) is used to control the sliding block three (7) to move away from the core pulling block (1).

8. The oblique release mechanism of an automobile plastic injection mold according to claim 7, characterized in that: The sliding block (7) is provided with a second sliding groove (71) connected to the horn flow channel (22), the cutting knife (52) extends into the second sliding groove (71), and a third sliding groove (72) is provided on the side wall of the second sliding groove (71). The third control mechanism (8) comprises a through groove (81) provided on the cutting knife (52), a limit block (82) slidingly connected to the third sliding groove (72), a third inclined surface (83) provided on the end of the limit block (82) away from the horn flow channel (22), and a third spring (84) provided in the third sliding groove (72), the elastic force of the third spring (84) acting on the limit block (82), and the third spring (84) 4) Always drive the limit block (82) to move toward the second sliding groove (71), the through groove (81) is connected to the horn flow channel (22) and becomes a part of the horn flow channel (22), and the through groove (81) will be connected with the third sliding groove (72) during the process of moving away from the second sliding cavity (15), and when the through groove (81) moves to be connected with the third sliding groove (72), the third spring (84) pushes the end of the limit block (82) close to the second sliding groove (71) into the through groove (81); during the movement and reset process of the cutting knife (52), the third inclined surface (83) is pressed to drive the sliding block three (7) located in the through groove (81) to move into the third sliding groove (72).

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