An oblique release mechanism for an injection mold for automotive plastic parts

Abstract

The present invention relates to an oblique release mechanism for an injection mold for automotive plastic parts, comprising a core pulling block for forming undercuts, and a gate provided on the core pulling block. The gate comprises a main channel and a latent bull-horn runner, wherein the main channel is used to receive hot-melt plastic, and the bull-horn runner connects the main channel and a cavity on the mold for forming undercuts. The core pulling block is provided with a mounting cavity, wherein a mounting seat is slidably connected within the mounting cavity. The core pulling block is provided with a connecting hole connecting the mounting cavity and the main channel, wherein the mounting seat is provided with a push rod, wherein the push rod extends into the connecting hole. The core pulling block is provided with a first control mechanism, wherein the first control mechanism is used to control the sliding movement of the mounting seat to drive the push rod to move into the main channel. The present invention ensures that the undercuts of automotive plastic parts are formed completely, automatically separates waste materials and undercuts when the mold is opened, and prevents the undercuts from being pulled, thereby preventing the side contour of the undercut from being deformed by pulling.

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] Automotive plastic parts are often designed with undercuts to facilitate interfitting. Angled core pullers are often used in injection molds to create these undercuts. After the part is molded, a hydraulic cylinder drives the core puller to slide away from the formed undercut, allowing the molded part to be smoothly ejected from the mold.

[0003] In order to ensure the integrity of the undercut molding of automotive plastic parts, a gate specifically used to form 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 on the mold for forming the undercut structure.

[0004] Opening a gate can be used to mold using an undercut structure, but the hot melt plastic remaining in the gate becomes waste material. This waste material is directly connected to the molded undercut. When the core puller slides, it pulls the waste material away from the undercut, breaking the connection between the waste material and the undercut, thereby separating the waste material and the undercut. This strong pulling method of separating the undercut and the waste material can easily damage the undercut, causing it to lose a piece. Therefore, how to separate the undercut and the waste material without damaging the undercut becomes a problem. Summary of the Invention

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

[0006] The present application provides an oblique release mechanism for an automotive plastic injection mold, which adopts the following technical solution:

[0007] An oblique release mechanism for an injection mold for automotive plastic parts includes a core pulling block for forming undercuts and a gate provided on the core pulling block, the gate including a main channel and a latent bull-horn runner, the main channel being used to receive hot-melt plastic, the bull-horn runner connecting the main channel and a cavity on the mold for forming undercuts, a mounting cavity being provided in the core pulling block, a mounting seat being slidably connected in the mounting cavity, a connecting hole connecting the mounting cavity and the main channel being provided on the core pulling block, a push rod being provided on the mounting seat, the push rod extending into the connecting hole, a first control mechanism being provided on the core pulling block, the first control mechanism being used to control the sliding of the mounting seat to drive the push rod to move into the main channel.

[0008] 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 of 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 breaking position 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, thereby reducing the probability of the undercut being damaged when the waste material is separated from the undercut.

[0009] Preferably, the first control mechanism includes a nitrogen spring provided on the core pulling block and a limiting rod provided in the mounting cavity, the mounting seat is located between the limiting rod and the nitrogen spring, the nitrogen spring is located on the side of the mounting seat away from the main 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 channel, one end of the limiting rod is connected to the mounting seat, and the other end of the limiting rod extends out of the core pulling block. When the mold is closed, the fixed mold of the mold will press the limiting rod so that the mounting seat conflicts with the side wall of the mounting cavity away from the main channel and the nitrogen spring is compressed.

[0010] By adopting the above technical solution, when the mold is opened, the fixed mold and the movable mold are separated. The fixed mold no longer presses the limit rod, and the nitrogen spring is no longer under pressure. Therefore, the nitrogen spring rebounds and drives the mounting seat to slide toward the main flow channel, allowing the ejector rod to directly eject the waste material from the main flow channel, completing the separation of the waste material and the undercut before the core pulling block moves away from the undercut. During the mold closing process, the fixed mold presses the limit rod and drives the limit rod into the mounting cavity. When the limit rod moves into the mounting cavity, it drives the mounting seat away from the main flow channel and compresses the nitrogen spring.

[0011] Preferably, a first sliding cavity is provided on the core pulling block, 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.

[0012] 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 horn runner so that the cutting knife moves into the horn runner to cut off the waste material in the horn runner, 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.

[0013] Preferably, a second sliding cavity is provided on the core pulling block, and 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, and 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 guide slope opened on the sliding block 2, a second control component for controlling the sliding of the sliding block 2, and a first spring provided in the first sliding cavity, one end of the sliding block 1 away from the bull horn flow channel is in contact with the first guide slope, 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 by the cooperation of the first guide 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 contacts the first guide slope.

[0014] By adopting this technical solution, when the second control assembly controls the sliding block 2 to slide away from the installation cavity, it can drive the sliding block 1 to slide closer to the horn flow channel, causing the first spring to be compressed. When the second control assembly controls the sliding block 2 to slide closer to the installation cavity, the first spring will rebound and drive the sliding block 1 away from the horn flow channel, completing the movement and reset of the sliding block 1.

[0015] Preferably, the second sliding cavity is connected to the mounting cavity, and the second control component includes a second guide slope 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 guide slope. When the mounting seat moves close to the main channel, the sliding block 2 is driven to slide into the second sliding cavity through the cooperation between the second guide slope and the sliding block 2. The second spring is located on the side of the sliding block 2 away from the mounting cavity. The elastic force of the second spring acts on the sliding block 2. 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.

[0016] By adopting the above technical solution, when the mounting seat slides toward the main flow channel, it drives sliding block 2 to move into the second sliding cavity and compress the second spring. When sliding block 2 moves into the second sliding cavity, it drives sliding block 1 to move toward the ox-horn flow channel and compresses the first spring. During the movement and reset process of the mounting seat, the second guiding bevel gradually moves to a position facing the second sliding cavity. Once the second guiding bevel begins to engage the second sliding cavity, the second spring rebounds and pushes sliding block 2 into the mounting cavity, causing sliding block 2 to contact and engage with the second guiding bevel. When sliding block 2 moves into the mounting cavity, the first spring rebounds and pushes sliding block 1 away from the ox-horn flow channel.

[0017] Preferably, a guide cavity is provided in the mounting seat, and the 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.

[0018] 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 the cutting knife will move into the horn flow channel to cut off the waste material in the horn 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 cut waste material in the main flow channel and the horn flow channel out of the core pulling block.

[0019] 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.

[0020] By adopting the above technical solution, after the waste material in the bullhorn runner is cut off, the third control mechanism controls the sliding block to slide three times, thereby increasing the space in the bullhorn runner and removing the undercut structure between the waste material in the bullhorn runner and the bullhorn runner. As a result, the waste material in the bullhorn runner is not easily broken in the bullhorn runner when the waste material is ejected from the core pulling block. At the same time, as the core pulling block moves away from the undercut, a small amount of waste material connected to the undercut will not be broken by the undercut structure of the bullhorn runner, thereby protecting the undercut of the automotive plastic part. The small amount of waste material connected to the undercut of the automotive plastic part can be manually repaired later.

[0021] and a control mechanism comprising: a first spring which is adapted to move the first end of the cutting blade into the second groove and a second spring which is adapted to move the cutting blade into the third groove.

[0022] By adopting the above technical solution, when the product is injection molded, the through groove will become a part of the ox horn runner, ensuring the smooth flow of the ox horn runner. When the sliding block moves close to the ox 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 ox horn runner. Then when the through groove moves to connect 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, allowing sliding block three to move away from the core, thereby increasing the space of the ox horn runner and removing the inverted structure between the waste material in the ox horn runner and the ox horn runner.

[0023] The technical effects of the present invention are mainly reflected in the following aspects:

[0024] 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 out of the core pulling block and being undercut;

[0025] 2. After the waste material is cut off, the cutting knife can move with the sliding block three by cooperating with the through groove and the limit block, so that the horn flow channel becomes larger, making it easier for the waste material in the horn flow channel to escape;

[0026] 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

[0027] Figure 1 This is a structural schematic diagram of the oblique release mechanism of the automobile plastic part injection mold of the present application in the mold closing state.

[0028] Figure 2 yes Figure 1 A top view of the oblique release mechanism of an injection mold for automotive plastic parts.

[0029] Figure 3 yes Figure 2 Cross-sectional view of the oblique release mechanism of the injection mold for automotive plastic parts along line AA.

[0030] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle.

[0031] Figure 5 yes Figure 3 A partial enlarged view of point C in the middle.

[0032] Figure 6 yes Figure 2 Cross-sectional view of the oblique release mechanism of the injection mold for automotive plastic parts along line DD.

[0033] Figure 7 yes Figure 3 A schematic diagram of the structure when the middle mounting seat pushes the sliding block 2 completely into the second sliding groove.

[0034] Figure 8 yes Figure 7 A partial enlarged view of point E in the middle.

[0035] Figure 9 yes Figure 7 A partial enlarged view of point F in the middle.

[0036] Figure 10 yes Figure 2 Cross-sectional view of the oblique release mechanism of the injection mold for automotive plastic parts along line GG.

[0037] Figure 11 yes Figure 10 Schematic diagram of the structure when the middle through groove moves to dock with the third sliding groove.

[0038] Figure 12 yes Figure 11 Schematic diagram of the structure when the middle cutting knife moves to the farthest distance from the second sliding groove.

[0039] Figure 13 yes Figure 12 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.

[0040] 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 channel; 22. bullhorn runner; 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 guide slope; 63. second control assembly; 631. second guide 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

[0041] The present invention is further described in detail below with reference to the accompanying drawings to make the technical solution of this application easier to understand and grasp.

[0042] Reference Figures 1-4 The oblique release mechanism of an automotive plastic injection mold of this embodiment includes a core pulling block 1 for forming an undercut and a gate 2 formed on the core pulling block 1. The gate 2 includes a main channel 21 and a latent bull-horn runner 22. The main channel 21 is used to receive hot melt plastic, and the bull-horn runner 22 connects the main channel 21 and the cavity in the mold used to form the undercut.

[0043] Reference Figure 1-Figure 3 The core pulling block 1 is provided with a mounting cavity 11, and a mounting seat 3 is vertically slidably connected to the mounting cavity 11. The mounting seat 3 has two guide cavities 32. The core pulling block 1 is provided with two connecting holes 12 connecting the mounting cavity 11 and the main channel 21. The mounting seat 3 is provided with two ejector pins 31. One end of the two ejector pins 31 extends into the two guide cavities 32 respectively, and the other end of the two ejector pins 31 extends into the two connecting holes 12 respectively. A push-pull column 33 is fixed to one end of the two ejector pins 31 extending into the guide cavity 32. The push-pull column 33 is vertically slidably connected to the guide cavity 32. The diameter of the push-pull column 33 is larger than the diameter of the ejector pin 31. When the mold is in the closed state, the push-pull column 33 conflicts with the side wall of the guide cavity 32 close to the main channel 21, and does not contact the side wall of the guide cavity 32 away from the main channel 21.

[0044] Reference Figure 1-Figure 3 、 Figure 6The core pulling block 1 is provided with a first control mechanism 4, which is used to control the sliding of the mounting seat 3 to drive the ejector rod 31 to move into the main 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 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 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 channel 21 are in conflict and the nitrogen spring 41 is compressed.

[0045] Reference Figure 3-Figure 5 The core pulling block 1 is provided with a first sliding cavity 13, in which a sliding block 1 51 is vertically slidably connected. The core pulling block 1 is provided with a first sliding groove 14 that connects the first sliding cavity 13 and the horn flow channel 22. A cutting blade 52 is fixed to the sliding block 1 51, and the end of the cutting blade 52 away from the sliding block 1 51 extends into the first sliding groove 14.

[0046] Reference Figure 3-Figure 5 、 Figure 7-Figure 9 The core pulling block 1 is provided with a second sliding cavity 15. The second sliding cavity 15 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. The second control mechanism 6 is used to control the sliding movement of the sliding block 1 51 so that the cutting knife 52 moves into the horn flow channel 22.

[0047] Reference Figure 3-Figure 5 、 Figure 7-Figure 9 The second control mechanism 6 includes a second sliding block 61 that is horizontally slidably connected to the second sliding cavity 15, a first guiding slope 62 formed on the second sliding block 61, and a first spring 64 disposed within the first sliding cavity 13. The end of the first sliding block 51 that is away from the horn flow channel 22 is in contact with the first guiding slope 62. When the second sliding block 61 slides away from the mounting cavity 11, the first guiding slope 62 cooperates with the first sliding block 51 to drive the first sliding block 51 toward the horn flow channel 22. The first spring 64 is located on the side of the first sliding block 51 away from the second sliding block 61. The elastic force of the first spring 64 acts on the first sliding block 51, constantly driving the first sliding block 51 toward the second sliding block 61 so that the first sliding block 51 always contacts the first guiding slope 62.

[0048] Reference Figure 3-Figure 5 、 Figure 7-Figure 9The 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 guide slope 631 provided on the end of the mounting seat 3 near 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 abuts against the second guide slope 631. When the mounting seat 3 moves closer to the main flow channel 21, the second guide slope 631 cooperates with the second sliding block 61 to drive the second sliding block 61 to slide into the second sliding cavity 15. When the mounting seat 3 drives the second sliding block 61 to slide completely 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 channel.

[0049] 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.

[0050] Reference Figure 3-Figure 5 、 Figure 7-10 The core pulling block 1 is also connected to a sliding block 3 7 which slides in the vertical direction. The sliding block 3 7 and the core pulling block 1 together form a bull horn flow channel 22. A second sliding groove 71 connecting to the bull horn flow channel 22 is provided on the sliding block 3 7. The cutting knife 52 extends into the second sliding groove 71. A third sliding groove 72 is provided on the side wall of the second sliding groove 71.

[0051] Reference Figure 3-Figure 5 、 Figure 7-10 The core pulling block 1 is also provided with a third control mechanism 8 for controlling the movement of the sliding block 3 7 away from the core pulling block 1, thereby moving the sliding block 3 7 away from the plastic waste in the horn flow channel 22. The third control mechanism 8 includes a through slot 81 defined in the cutting blade 52, a stopper 82 horizontally slidably connected to the third sliding slot 72, a third inclined surface 83 defined on the end of the stopper 82 away from the horn flow channel 22, and a third spring 84 disposed in the third sliding slot 72.

[0052] Reference Figure 3-Figure 5 、 Figure 7-13The elastic force of the third spring 84 acts on the stopper 82, constantly driving the stopper 82 toward the second sliding groove 71. The through groove 81 connects to the horn flow channel 22 and becomes a part of the horn flow channel 22. As the through groove 81 moves away from the second sliding cavity 15, it connects with the third sliding groove 72. When the through groove 81 moves to connect with the third sliding groove 72, the third spring 84 pushes the end of the stopper 82 closest to the second sliding groove 71 into the through groove 81. During the movement and reset of the cutting blade 52, the cutting blade 52 first presses against the third inclined surface 83, forcing the end of the sliding block 73 located in the through groove 81 to move into the third sliding groove 72.

[0053] The release steps of the oblique release mechanism of the automobile plastic injection mold of the present application are as follows.

[0054] Reference Figure 3 and Figure 5 When producing automobile plastic parts, 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 undercut injection molding.

[0055] 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.

[0056] Reference Figure 3-Figure 9 When the mounting seat 3 slides toward the main 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 channel 22 and cause the first spring 64 to be compressed.

[0057] Reference Figure 3-Figure 5 、 Figure 7-12 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 and directly cut off the waste in the horn flow channel 22.

[0058] Reference Figure 3-Figure 5 、 Figure 7-12Then, when the through groove 81 moves to connect with the third sliding groove 72, the third spring 84 pushes the end of the limit block 82 into the through groove 81. Then, the cutting knife 52 moves with the sliding block 7 through the cooperation of the through groove 81 and the limit block 82, so that the sliding block 7 moves away from the core, thereby increasing the space of the horn runner 22 and eliminating the undercut structure between the waste material in the horn runner 22 and the horn runner 22.

[0059] Reference Figure 3-Figure 5 、 Figure 7-12 , 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 channel 21 and pushes the waste cut off in the main channel 21 and the horn flow channel 22 out of the core pulling block 1. Because the space of the horn flow channel 22 becomes larger, the waste in the horn flow channel 22 is not easily broken when it is pushed out of the horn 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 horn flow channel 22, completing the complete separation of the core pulling block 1 and the undercut.

[0060] Reference Figure 3-Figure 6 After the subsequent automotive plastic part is removed from the mold, the mold is closed and the injection molding of the next automotive plastic part begins again. During the mold closing process, the mold's fixed die presses the limit rod 42 and drives the limit rod 42 into the installation cavity 11. When the limit rod 42 moves into the installation cavity 11, it drives the mounting seat 3 away from the main channel 21, compressing the nitrogen spring 41 and moving the two ejector rods 31 into the two connecting holes 12.

[0061] Reference Figure 3-Figure 6 During the movement and resetting process of the mounting seat 3, the second guiding inclined surface 631 will gradually move to a position facing the second sliding cavity 15. Once the second guiding inclined surface 631 begins to dock with the second sliding cavity 15, the second spring 632 will rebound and push the second sliding block 61 to move into the mounting cavity 11 and make the second sliding block 61 contact and fit with the second guiding inclined surface 631. When the second sliding block 61 moves into the mounting cavity 11, the first spring 64 will rebound and push the first sliding block 51 to move away from the horn flow channel 22.

[0062] Reference Figure 3-Figure 5 、 Figure 13 When the sliding block 1 51 moves away from the horn flow channel 22, the sliding block 1 51 will move the cutting knife 52 to 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.

[0063] Reference Figure 3-Figure 5 、 Figure 13 When the sliding block 3 7 contacts the core-pulling block 1, it stops moving, but the cutting blade 52 continues to move. The cutting blade 52 presses against the third inclined surface 83, forcing the sliding block 3 7 located in the through groove 81 into the third sliding groove 72 and compressing the third spring 84. When the sliding block 3 7 is fully pushed into the third sliding groove 72, it continues to move toward the horn flow channel 22.

[0064] Reference Figure 3-Figure 5 When the mold is fully closed, the mounting seat 3 will also move to contact the side wall of the mounting cavity 11 away from the main 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.

[0065] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. Any 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 injection mold of an automobile plastic part, 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) includes a main channel (21) and a latent bullhorn channel (22), the main channel (21) is used to receive hot melt plastic, the bullhorn channel (22) is connected to the main channel (21) and a cavity on the mold for forming an undercut, the core pulling block (1) is provided with a mounting cavity (11), the mounting cavity (11) is slidably connected with a mounting seat (3), the core pulling block (1) is provided with a connecting hole (12) connecting the mounting cavity (11) and the main channel (21), the mounting seat ( 3) is provided with a push rod (31), the push rod (31) extends into the connecting hole (12), the core pulling block (1) is provided with a first control mechanism (4), the first control mechanism (4) is used to control the sliding of the mounting seat (3) to drive the push rod (31) to move into the main channel (21); the core pulling block (1) is provided with a first sliding cavity (13), the first sliding cavity (13) is slidably connected with a sliding block (51), the core pulling block (1) is provided with a connecting rod (51) for connecting the first sliding cavity (13) and the horn The first sliding groove (14) of the flow channel (22) is provided on the sliding block (51), 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 block (51) to slide so that the cutting knife (52) moves into the horn flow channel (22); the core pulling block (1) is provided with a second sliding cavity (15), and the second sliding cavity (15) is located in the first sliding cavity (1 3) On the side away from the horn flow channel (22), the first sliding chamber (13) is connected to the second sliding chamber (15), the second sliding chamber (15) is connected to the installation chamber (11), and the second control mechanism (6) includes a sliding block 2 (61) slidingly connected to the second sliding chamber (15), a first guiding slope (62) provided on the sliding block 2 (61), a second control component (63) for controlling the sliding of the sliding block 2 (61), and a first spring (64) provided in the first sliding chamber (13).

2. The oblique release mechanism for an automotive plastic injection mold according to claim 1, characterized in that: The first control mechanism (4) includes a nitrogen spring (41) provided on the core pulling block (1) and a limiting rod (42) provided 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 the side of the mounting seat (3) away from the main 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 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 channel (21) collide with each other and the nitrogen spring (41) is compressed.

3. The oblique release mechanism for an automotive plastic injection mold according to claim 1, characterized in that: One end of the sliding block 1 (51) away from the ox-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 ox-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).

4. The oblique release mechanism for an automotive plastic injection mold according to claim 3, characterized in that: The second control component (63) includes a second guide bevel (631) provided on the mounting seat (3) and a second spring (632) provided in the second sliding cavity (15). One end of the sliding block 2 (61) extends into the mounting cavity (11) and fits with the second guide bevel (631). When the mounting seat (3) moves close to the main channel (21), the second guide bevel (631) and the sliding block 2 (61) cooperate to drive the sliding block 2 (61) to slide into the second sliding cavity (15). The second spring (632) is located on the side of the sliding block 2 (61) away from the mounting cavity (11). The elastic force of the second spring (632) acts on the sliding block 2 (61). The second spring (632) always drives the sliding block 2 (61) to move toward the mounting cavity (11) so that the sliding block 2 (61) always conflicts with the mounting seat (3).

5. The oblique release mechanism for an automotive plastic injection mold according to claim 4, 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), and a push-pull column (33) is provided on the end of the push rod (31) extending into the guide cavity (32), and 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 the initial state, the push-pull column (33) conflicts with the side wall of the guide cavity (32) close to the main channel (21), and the push-pull column (33) does not contact 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) contacts the side wall of the guide cavity (32) away from the main channel (21).

6. The oblique release mechanism for an automotive plastic injection mold according to claim 5, 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).

7. The oblique release mechanism for an automotive plastic injection mold according to claim 6, 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) includes 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) acts on the limit block (82). The third spring (84) is provided on the side wall of the second sliding groove (71). 4) Always drive the limit block (82) to move toward the second sliding groove (71), the through groove (81) is connected to the ox horn flow channel (22) and becomes a part of the ox horn flow channel (22), and the through groove (81) is connected with the third sliding groove (72) during the process of moving away from the second sliding chamber (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 (7) located in the through groove (81) to move into the third sliding groove (72).

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