Pin anti-falling structure of automobile part mold

Abstract

The application discloses a pin anti-falling structure of an automobile part mold and belongs to the technical field of automobile part molds. The pin anti-falling structure of the automobile part mold comprises a plurality of pin assemblies installed between a first mold and a second mold, a first expansion mechanism is installed on one side of the inner center of the pin assembly, a second expansion mechanism is installed on the other side of the inner center of the pin assembly, and a positioning mechanism is installed between the interiors of the first expansion mechanism and the second expansion mechanism. The positioning mechanism is designed, the pin assembly is fixed between the first mold and the second mold, positioning of two limiting balls is performed first, expansion precision of the mold is improved, anti-falling effect is further improved, assembly precision is improved when the first mold and the second mold are completely attached, and therefore, the machining part quality is improved.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts mold technology, specifically relating to a pin anti-loosening structure for automotive parts molds. Background Technology

[0002] Automotive parts molds are specialized tooling equipment used for the efficient, precise, and mass production of various metal or plastic automotive components. Their core function is to process specific mold steel into a precision assembly with forming cavities, guiding systems, and ejection mechanisms. Through processes such as injection molding, stamping, and die casting, raw materials are shaped within the mold to produce complex, dimensionally consistent parts that meet stringent automotive industry standards, such as dashboards, door panels, engine hoods, and lamp covers. They are the cornerstone of automotive industrial production, directly determining the quality, production efficiency, and cost of parts. The anti-detachment pin structure in automotive parts molds refers to a specially designed mechanical locking device on the pins (such as guide pillars, guide sleeves, and reset rods) used for precise positioning or guidance within the mold. This device prevents accidental detachment or displacement due to vibration, impact, or frequent mold opening and closing during operation. Its core purpose is to ensure mold running accuracy, protect the molded parts, and guarantee operational safety.

[0003] When installing two molds, multiple pins are usually inserted into the corresponding mold holes to position the two molds together. Then, screws and nuts are installed to achieve the final fixed connection. The pins greatly improve the accuracy of mold closing. However, the vibration generated by the machine during use can easily cause the pins to fall off. At the same time, the existing pins are not effective at preventing them from falling off, causing the mold to slip. This results in low precision of the molded parts and can also damage the mold itself. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a pin anti-detachment structure for automotive parts molds.

[0005] The technical solution adopted to solve the above technical problems is: a pin anti-loosening structure for automotive parts mold, including multiple pin assemblies installed between a first mold and a second mold, wherein a first tightening mechanism is installed on one side of the internal center of the pin assembly;

[0006] A second tightening mechanism is installed on the other side of the internal center of the pin assembly;

[0007] A positioning mechanism is installed between the first and second expansion mechanisms. The positioning mechanism is used to position the second mold, so that the second expansion mechanism can quickly expand and tighten the second mold.

[0008] Furthermore, the pin assembly includes a pin head, one end of which is fixedly connected to a pin shell, and the other end of which is fixedly connected to a pin tip. Two limiting grooves are formed on the outer wall of the pin shell. A first fixing cylinder is fixedly connected to the center of one side of the pin head. A plurality of first limiting rods are fixedly connected to the other end of the first fixing cylinder. A second fixing cylinder is fixedly connected to the other end of the plurality of first limiting rods. A plurality of second limiting rods are fixedly connected to the other end of the second fixing cylinder. A fixing sleeve is fixedly connected to the other end of the plurality of second limiting rods. A first fixing frame is fixedly connected to the outer wall of the second fixing cylinder, and a second fixing frame is fixedly connected to the outer wall of the fixing sleeve.

[0009] With the above technical solution, when the entire pin assembly needs to be installed between the first mold and the second mold, the worker first inserts the pin tip into the mounting hole on the first mold. At this time, the pin shell first contacts the first mold. The pin head is pushed forcefully to insert the pin shell into the specified depth, so that the pin assembly is initially positioned successfully with the first mold. The outer wall of the pin shell is corrugated, which can play an anti-slip role and prevent the inserted pin shell from sliding, which facilitates the subsequent installation with the second mold.

[0010] Furthermore, both the first and second fixing brackets are fixedly connected to the inner wall of the nail shell.

[0011] The above technical solution makes the first fixing frame, the second fixing frame, and the nail shell an integrated structure, which greatly improves the overall firmness and prevents poor overall structural stability, thus improving the stability of the mold.

[0012] Furthermore, the first expansion mechanism includes a first rotating tube rotatably connected to the inner wall of the first fixed cylinder, a first rotating head fixedly connected to one end of the first rotating tube, a first thread provided at the center of the outer wall of the first rotating tube, a first movable seat threadedly connected to the first rotating tube through the first thread, a first fixed seat fixedly connected to one end of the outer wall of the first fixed cylinder, a plurality of first X-shaped connecting rods installed between the first movable seat and the first fixed seat, and a first expansion plate installed at the outer end of each of the plurality of first X-shaped connecting rods.

[0013] With the above technical solution, when the pin assembly is installed before the first mold, the pin assembly is forcefully inserted into the mounting hole of the first mold a specified distance, and then the first rotating head is rotated, thereby driving the first rotating tube to rotate. Since the first movable seat is slidably connected to multiple first limiting rods, the first movable seat is moved slowly, thereby driving multiple first X-shaped connecting rods to open, thereby driving multiple first expansion plates to slowly contact the inner wall of the mounting hole of the first mold, realizing expansion and completing the positioning of the pin assembly and the first mold, which facilitates the subsequent positioning and installation of the second mold.

[0014] Furthermore, the other end of the outer wall of the first rotating tube is rotatably connected to the inner wall of the second fixed cylinder, and the first movable seat is slidably connected to multiple first limiting rods. In the combined state, multiple first expansion plates are all in contact with the inner wall of the corresponding mounting holes on the first mold.

[0015] Through the above technical solution, since the pin assembly is first installed and fitted with the first mold through the pin shell, its overall stability is strong, which facilitates subsequent tightening and installation and improves the ease of operation.

[0016] Furthermore, the second expansion mechanism includes a second rotating tube rotatably connected to the inner wall of the first rotating tube, a second rotating head fixedly connected to one end of the second rotating tube, a second thread on the outer wall of the second rotating tube, a second movable seat threadedly connected to the second rotating tube through the second thread, a second fixed seat fixedly connected to one end of the outer wall of the second fixed cylinder, a plurality of second X-shaped connecting rods installed between the second movable seat and the second fixed seat, and a second expansion plate installed at the outer end of each of the plurality of second X-shaped connecting rods.

[0017] With the above technical solution, when the first expansion mechanism is installed in the first mold and the second mold is positioned by the positioning mechanism, the second expansion mechanism can expand the second mold to prevent the entire pin assembly from falling off. At this time, the second rotating head is rotated, thereby driving the second rotating tube to rotate. Since the second movable seat is slidably connected to multiple second limit rods, the second movable seat is moved by the second thread, thereby driving the second X-shaped connecting rod to open, thereby driving multiple second expansion plates to expand the inner wall of the second mold and further fix it to the second mold, so that the entire pin assembly is expanded and fixed to the first mold and the second mold, preventing the pin assembly from falling off during the operation of the mold.

[0018] Furthermore, the other end of the outer wall of the second rotating tube is rotatably connected to the inner wall of the fixed sleeve, and the second movable seat is slidably connected to multiple second limiting rods. In the combined state, multiple second expansion plates are all in contact with the inner wall of the corresponding mounting holes on the second mold.

[0019] With the above technical solution, before the second mold is tightened, the pin assembly first contacts the inner wall of the second mold through the pin shell to achieve initial positioning. Subsequently, multiple second tightening plates further tighten the inner wall of the second mold to improve the fixing effect and prevent the entire pin assembly from falling off. Together with the pin shell, the fixation is improved, thereby improving the anti-fall-off effect.

[0020] Furthermore, the positioning mechanism includes a rotating rod slidably connected to the inner wall of the second rotating tube. One end of the rotating rod is fixedly connected to a limiting plate. A convex ring is provided at the center of the outer wall of the limiting plate. A first groove and a second groove are respectively provided on both sides of the convex ring on the outer wall of the limiting plate. A limiting ball is provided in each of the two limiting grooves. A fixing shell is fixedly connected to the center of the other side of the nail head. A fixing plate is fixedly connected to the other end of the outer wall of the rotating rod. A pressing head is fixedly connected to the other end of the rotating rod. A first spring and a second spring are fixedly installed inside the fixing shell.

[0021] With the above technical solution, when positioning the second mold, the pin assembly is inserted into the mounting holes of the first and second molds. During the insertion process, the extrusion head is pushed, which in turn drives the limiting plate through the rotating rod, thereby pushing the second groove position so that the limiting ball enters the second groove. When the pin assembly is inserted into the designated position, the pushing force of the extrusion head is released. Under the action of the first and second springs, the rotating rod is driven to reset, which in turn drives the limiting plate to reset, causing the convex ring to push out the limiting ball, and the limiting ball to push out of the limiting groove, thereby limiting it with one end of the second mold and preventing the first and second molds from sliding after the entire pin assembly is inserted. At this time, the first and second expansion mechanisms are used to expand and tighten the first and second molds respectively to complete the positioning.

[0022] Furthermore, in the combined state, the limiting disc is close to the two limiting balls via a convex ring.

[0023] The above technical solution improves the tightening accuracy of the mold by positioning the two limiting balls, further enhancing the anti-detachment effect. When the two limiting balls are positioned, the first mold and the second mold fit together perfectly, which also improves their assembly accuracy and thus improves the quality of the processed parts.

[0024] Furthermore, the two sides of the fixed plate are respectively fixedly connected to the first spring and the second spring.

[0025] With the above technical solution, when the pin assembly is pulled out, the pin head is pulled and the extrusion head is pulled at the same time, thereby pulling the limiting plate and thus pulling the position of the first groove, so that the limiting ball slides into the first groove, causing the two limiting balls to lose their positioning effect on the second mold. When the pin head is pulled out continuously, the entire pin assembly is pulled out. The operation is simple and the pin assembly can be quickly disassembled.

[0026] The beneficial effects of the present invention are as follows: (1) The present invention designs a positioning mechanism, and the pin assembly is positioned between the first mold and the second mold by two limiting balls, which improves the tightening accuracy of the mold and further improves the anti-fall-off effect. When the first mold and the second mold are fully fitted, the assembly accuracy is improved at the same time, thereby improving the quality of the processed parts; (2) The present invention designs a first tightening mechanism and a second tightening mechanism. The first tightening mechanism quickly tightens and fixes the first mold, which facilitates the subsequent tightening of the second mold by the second tightening mechanism, improving the tightening accuracy. The second tightening mechanism can quickly tighten the second mold to prevent the mold from falling off. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall installation structure of the present invention;

[0028] Figure 2 This is an exploded view of the overall structure of the present invention;

[0029] Figure 3 This is a cross-sectional view of the overall structure of the present invention;

[0030] Figure 4 This is an appearance drawing of the present invention;

[0031] Figure 5 This is the front view of the present invention;

[0032] Figure 6 This is a schematic diagram of the first and second expansion mechanisms of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the first expansion mechanism, the second expansion mechanism, and the positioning mechanism of the present invention;

[0034] Figure 8 for Figure 3 A magnified view of a section at point A in the middle;

[0035] Figure 9 for Figure 8 A magnified view of a section at point B in the middle;

[0036] Figure 10 for Figure 8 A magnified view of a section at point C.

[0037] Reference numerals: 1. Pin assembly; 101. Pin head; 102. Pin tip; 103. Pin shell; 104. Limiting groove; 105. First fixing cylinder; 106. First limiting rod; 107. Second fixing cylinder; 108. Second limiting rod; 109. Fixing sleeve; 110. First fixing frame; 111. Second fixing frame; 2. First expansion mechanism; 201. First rotating tube; 202. First rotating head; 203. First thread; 204. First movable seat; 205. First fixing seat; 206. First X-shaped connecting rod; 207. First expansion plate; 3. 301. Second expanding and tightening mechanism; 302. Second rotating tube; 303. Second rotating head; 304. Second thread; 305. Second movable seat; 306. Second fixed seat; 307. Second X-shaped connecting rod; 308. Second expanding and tightening plate; 4. Positioning mechanism; 401. Rotating rod; 402. Limiting plate; 403. Convex ring; 404. First groove; 405. Second groove; 406. Limiting ball; 407. Fixed shell; 408. Fixed plate; 409. Extrusion head; 410. First spring; 411. Second spring; 5. First mold; 6. Second mold. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0039] like Figures 1-9As shown, this embodiment of a pin anti-detachment structure for an automotive parts mold includes multiple pin assemblies 1 installed between a first mold 5 and a second mold 6. Each pin assembly 1 includes a pin head 101, one end of which is fixedly connected to a pin shell 103, and the other end of which is fixedly connected to a pin tip 102. Two limiting grooves 104 are formed on the outer wall of the pin shell 103. A first fixing cylinder 105 is fixedly connected to the center of one side of the pin head 101. Multiple first limiting rods 106 are fixedly connected to the other end of the first fixing cylinder 105. A second fixing cylinder 107 is fixedly connected to the other end of the multiple first limiting rods 106. Multiple second limiting rods 108 are fixedly connected to the other end of the second fixing cylinder 107. A fixing sleeve 109 is fixedly connected to the other end of the multiple second limiting rods 108. A first fixing frame 110 is fixedly connected to the outer wall of the second fixing cylinder 107. The outer wall of mold 9 is fixedly connected to a second fixing bracket 111. When the entire pin assembly 1 needs to be installed between the first mold 5 and the second mold 6, the worker first inserts the pin tip 102 into the mounting hole on the first mold 5. At this time, the pin shell 103 first contacts the first mold 5. The pin head 101 is pushed forcefully to insert the pin shell 103 into the specified depth, so that the pin assembly 1 is initially positioned successfully with the first mold 5. The outer wall of the pin shell 103 is corrugated, which can play an anti-slip role and prevent the inserted pin shell 103 from sliding, which facilitates the subsequent installation with the second mold 6. The first fixing bracket 110 and the second fixing bracket 111 are both fixedly connected to the inner wall of the pin shell 103, so that the first fixing bracket 110, the second fixing bracket 111 and the pin shell 103 are an integral structure, which greatly improves the overall firmness and prevents poor overall structural stability, thereby improving the stability of the mold.

[0040] like Figures 1-6As shown, the first expansion mechanism 2 includes a first rotating tube 201 rotatably connected to the inner wall of the first fixed cylinder 105. One end of the first rotating tube 201 is fixedly connected to a first rotating head 202. A first thread 203 is provided at the center of the outer wall of the first rotating tube 201. The first rotating tube 201 is threadedly connected to a first movable seat 204 through the first thread 203. One end of the outer wall of the first fixed cylinder 105 is fixedly connected to a first fixed seat 205. A plurality of first X-shaped connecting rods 206 are installed between the first movable seat 204 and the first fixed seat 205. A first expansion plate 207 is installed at the outer end of each of the plurality of first X-shaped connecting rods 206. When the pin assembly 1 is installed before the first mold 5, the pin assembly 1 is forcefully inserted into the mounting hole of the first mold 5 a specified distance, and then the first rotating head 202 is rotated, thereby driving the first rotating tube 201 to rotate. Since the first movable seat 204 and the first fixed seat 205 are fixedly connected to the first fixed seat 205, the first rotating head 202 is rotated. Multiple first limiting rods 106 are slidably connected, thereby driving the first movable seat 204 to move slowly, thereby driving multiple first X-shaped connecting rods 206 to open, thereby driving multiple first expansion plates 207 to slowly contact the inner wall of the mounting hole of the first mold 5, realizing expansion and tightening, completing the positioning of the pin assembly 1 and the first mold 5, which facilitates the subsequent positioning and installation of the second mold 6. The first expansion mechanism 2 is installed on one side of the inner center of the pin assembly 1, and the other end of the outer wall of the first rotating tube 201 is rotatably connected to the inner wall of the second fixed cylinder 107. The first movable seat 204 is slidably connected to multiple first limiting rods 106. In the combined state, multiple first expansion plates 207 are all in contact with the inner wall of the corresponding mounting hole on the first mold 5. Since the pin assembly 1 is first installed and cooperated with the first mold 5 through the pin shell 103, its overall stability is strong, which facilitates subsequent expansion and installation and improves the ease of operation.

[0041] like Figures 1-7As shown, a second expansion mechanism 3 is installed on the other side of the internal center of the pin assembly 1. The second expansion mechanism 3 includes a second rotating tube 301 rotatably connected to the inner wall of the first rotating tube 201. A second rotating head 302 is fixedly connected to one end of the second rotating tube 301. A second thread 303 is provided on the outer wall of the second rotating tube 301. A second movable seat 304 is threadedly connected to the second rotating tube 301 through the second thread 303. A second fixed seat 305 is fixedly connected to one end of the outer wall of the second fixed cylinder 107. A plurality of second X-shaped connecting rods 306 are installed between the second movable seat 304 and the second fixed seat 305. A second expansion plate 307 is installed on the outer end of each of the plurality of second X-shaped connecting rods 306. When the first expansion mechanism 2 is installed on the... When the first mold 5 is in place and the second mold 6 is positioned by the positioning mechanism 4, the second mold 6 can be tightened by the second expansion mechanism 3 to prevent the entire pin assembly 1 from falling off. At this time, the second rotating head 302 is rotated, thereby driving the second rotating tube 301 to rotate. Since the second movable seat 304 is slidably connected to multiple second limit rods 108, the second movable seat 304 is moved by the second thread 303, thereby driving the second X-shaped connecting rod 306 to open, thereby driving multiple second expansion plates 307 to tighten the inner wall of the second mold 6, further fixing it to the second mold 6, so that the entire pin assembly 1 is tightened and fixed to the first mold 5 and the second mold 6, preventing the pin assembly 1 from falling off during the operation of the mold.

[0042] The other end of the outer wall of the second rotating tube 301 is rotatably connected to the inner wall of the fixed sleeve 109. The second movable seat 304 is slidably connected to multiple second limiting rods 108. In the combined state, multiple second expansion plates 307 are all in contact with the inner wall of the corresponding mounting holes on the second mold 6. Before expansion with the second mold 6, the pin assembly 1 contacts the inner wall of the second mold 6 through the pin shell 103 to achieve preliminary positioning. Subsequently, multiple second expansion plates 307 further expand the inner wall of the second mold 6 to improve the fixing effect and prevent the entire pin assembly 1 from falling off. The pin shell 103 is used to improve the fixing and thus improve the anti-fall-off effect.

[0043] like Figures 1-10As shown, a positioning mechanism 4 is installed between the interior of the first expansion mechanism 2 and the second expansion mechanism 3. The positioning mechanism 4 is used to position the second mold 6, facilitating the second expansion mechanism 3 to quickly expand and tighten the second mold 6. The positioning mechanism 4 includes a rotating rod 401 slidably connected to the inner wall of the second rotating tube 301. One end of the rotating rod 401 is fixedly connected to a limiting plate 402. A convex ring 403 is provided at the center of the outer wall of the limiting plate 402. A first groove 404 and a second groove 405 are respectively provided on both sides of the convex ring 403 on the outer wall of the limiting plate 402. A limiting ball 406 is provided in each of the two limiting grooves 104. A fixing shell 407 is fixedly connected to the center of the other side of the nail head 101. A fixed plate 408 is fixedly connected to the other end of the outer wall of the rotating rod 401, and an extrusion head 409 is fixedly connected to the other end of the rotating rod 401. A first spring 410 and a second spring 411 are fixedly installed inside the fixed shell 407. When positioning the second mold 6, the pin assembly 1 is inserted into the mounting holes of the first mold 5 and the second mold 6. During the insertion process, the extrusion head 409 is pushed, thereby driving the limiting plate 402 to be pushed through the rotating rod 401, thereby pushing the second groove 405 to the position, so that the limiting ball 406 enters the second groove 405. When the pin assembly 1 is inserted into the designated position, the pushing force of the extrusion head 409 is released, and the first spring 410 and the second spring 411 are in operation. When the pin assembly is inserted, the rotating rod 401 is reset, which in turn resets the limiting plate 402. This causes the convex ring 403 to push out the limiting ball 406, which in turn pushes out of the limiting groove 104, thus limiting the pin 406 to one end of the second mold 6. This prevents the first mold 5 and the second mold 6 from sliding after the entire pin assembly 1 is inserted. At this point, the first expanding mechanism 2 and the second expanding mechanism 3 expand the first mold 5 and the second mold 6 respectively, completing the positioning. In the combined state, the limiting plate 402 is close to the two limiting balls 406 through the convex ring 403. The positioning of the two limiting balls 406 improves the expansion accuracy of the mold and further enhances the anti-drop effect. When the limiting ball 406 is positioned, the first mold 5 and the second mold 6 are completely fitted together, which improves their assembly accuracy and thus improves the quality of their processed parts. The two sides of the fixing plate 408 are fixedly connected to the first spring 410 and the second spring 411 respectively. When the pin assembly 1 is pulled out, the pin head 101 is pulled, and the extrusion head 409 is pulled at the same time, thereby pulling the limiting plate 402, which in turn pulls the position of the first groove 404, so that the limiting ball 406 slides into the first groove 404, so that the two limiting balls 406 lose their positioning effect on the second mold 6. When the pin head 101 is pulled out continuously, the entire pin assembly 1 is pulled out. The operation is simple and the pin assembly 1 can be quickly disassembled.

[0044] The working principle of this embodiment is as follows: When installing the entire pin assembly 1 between the first mold 5 and the second mold 6, the worker first inserts the pin tip 102 into the mounting hole on the first mold 5. At this time, the pin shell 103 contacts the inner wall of the first mold 5 and the second mold 6. The pin head 101 is pushed forcefully to insert the pin shell 103 into the specified depth, so that the pin assembly 1 is initially positioned successfully with the first mold 5. The outer wall of the pin shell 103 is corrugated, which can play an anti-slip role and prevent the inserted pin shell 103 from sliding. At the same time, the extrusion head 409 is pushed, thereby driving the limiting plate 402 to push through the rotating rod 401, thereby pushing the second groove 40. Position 5 allows the limiting ball 406 to enter the second groove 405. When the pin assembly 1 is inserted into the designated position, the pushing force of the extrusion head 409 is released. Under the action of the first spring 410 and the second spring 411, the rotating rod 401 is driven to reset, thereby driving the limiting plate 402 to reset. This causes the convex ring 403 to push out the limiting ball 406, and the limiting ball 406 to push out of the limiting groove 104, thereby limiting it with one end of the second mold 6. This prevents the first mold 5 and the second mold 6 from sliding after the entire pin assembly 1 is inserted. At this time, the first expansion mechanism 2 and the second expansion mechanism 3 can be used to expand the first mold 5 and the second mold 6 respectively to complete the positioning.

[0045] Then rotate the first rotating head 202, thereby driving the first rotating tube 201 to rotate. Since the first movable seat 204 is slidably connected to multiple first limiting rods 106, the first movable seat 204 is driven to move slowly, thereby driving multiple first X-shaped connecting rods 206 to open, thereby driving multiple first expansion plates 207 to slowly contact the inner wall of the mounting hole of the first mold 5, realizing expansion and completing the expansion of the pin assembly 1 and the first mold 5.

[0046] Then rotate the second rotating head 302, thereby driving the second rotating tube 301 to rotate. Since the second movable seat 304 is slidably connected to multiple second limiting rods 108, the second movable seat 304 is moved through the second thread 303, thereby driving the second X-shaped connecting rod 306 to open, thereby driving multiple second expansion plates 307 to expand and tighten the inner wall of the second mold 6, further fixing it to the second mold 6, so that the entire pin assembly 1 is expanded and fixed to the first mold 5 and the second mold 6, preventing the pin assembly 1 from falling off during the operation of the mold;

[0047] This operation is used to tighten and fix the remaining pin components 1 to the first mold 5 and the second mold 6, making it easier to fix and install the first mold 5 and the second mold 6 in the next step using the threaded assembly.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A pin anti-detachment structure for an automotive parts mold, comprising a plurality of pin assemblies (1) installed between a first mold (5) and a second mold (6), wherein each pin assembly (1) includes a pin head (101), one end of which is fixedly connected to a pin shell (103), and the other end of which is fixedly connected to a pin tip (102). Two limiting grooves (104) are formed on the outer wall of the pin shell (103), and a first fixing cylinder (105) is fixedly connected to the center of one side of the pin head (101). The other end of the first fixed cylinder (107) is fixedly connected to a plurality of first limiting rods (106), the other end of the first limiting rods (106) is fixedly connected to a second fixed cylinder (107), the other end of the second fixed cylinder (107) is fixedly connected to a plurality of second limiting rods (108), the other end of the second limiting rods (108) is fixedly connected to a fixed sleeve (109), the outer wall of the second fixed cylinder (107) is fixedly connected to a first fixed frame (110), and the outer wall of the fixed sleeve (109) is fixedly connected to a second fixed frame (111). The characteristic feature is that: A first expansion mechanism (2) is installed on one side of the inner center of the pin assembly (1). The first expansion mechanism (2) includes a first rotating tube (201) rotatably connected to the inner wall of the first fixed cylinder (105). A first rotating head (202) is fixedly connected to one end of the first rotating tube (201). A first thread (203) is provided at the center of the outer wall of the first rotating tube (201). A first movable seat (204) is threaded to the first rotating tube (201) through the first thread (203). A first fixed seat (205) is fixedly connected to one end of the outer wall of the first fixed cylinder (105). A plurality of first X-shaped connecting rods (206) are installed between the first movable seat (204) and the first fixed seat (205). A first expansion plate (207) is installed at the outer end of each of the plurality of first X-shaped connecting rods (206). A second expansion mechanism (3) is installed on the other side of the internal center of the pin assembly (1). The second expansion mechanism (3) includes a second rotating tube (301) rotatably connected to the inner wall of the first rotating tube (201). A second rotating head (302) is fixedly connected to one end of the second rotating tube (301). A second thread (303) is provided on the outer wall of the second rotating tube (301). A second movable seat (304) is threaded to the second rotating tube (301) through the second thread (303). A second fixed seat (305) is fixedly connected to one end of the outer wall of the second fixed cylinder (107). A plurality of second X-shaped connecting rods (306) are installed between the second movable seat (304) and the second fixed seat (305). A second expansion plate (307) is installed on the outer end of each of the plurality of second X-shaped connecting rods (306). A positioning mechanism (4) is installed between the interior of the first expansion mechanism (2) and the second expansion mechanism (3). The positioning mechanism (4) includes a rotating rod (401) slidably connected to the inner wall of the second rotating tube (301). One end of the rotating rod (401) is fixedly connected to a limiting plate (402). A convex ring (403) is provided at the center of the outer wall of the limiting plate (402). A first groove (404) and a second groove (405) are respectively provided on both sides of the convex ring (403) on the outer wall of the limiting plate (402). The two limiting grooves (1) 04) Each of the two parts is provided with a limiting ball (406). A fixed shell (407) is fixedly connected to the center of the other side of the nail head (101). A fixed plate (408) is fixedly connected to the other end of the outer wall of the rotating rod (401). An extrusion head (409) is fixedly connected to the other end of the rotating rod (401). A first spring (410) and a second spring (411) are fixedly installed inside the fixed shell (407). The positioning mechanism (4) is used to position the second mold (6) so that the second expansion mechanism (3) can quickly expand the second mold (6).

2. The anti-detachment structure for pins in an automotive parts mold according to claim 1, characterized in that, The first fixing bracket (110) and the second fixing bracket (111) are both fixedly connected to the inner wall of the nail shell (103).

3. The anti-detachment structure for pins in an automotive parts mold according to claim 1, characterized in that, The other end of the outer wall of the first rotating tube (201) is rotatably connected to the inner wall of the second fixed cylinder (107), and the first movable seat (204) is slidably connected to multiple first limiting rods (106). In the combined state, multiple first expansion plates (207) are all in contact with the inner wall of the corresponding mounting hole on the first mold (5).

4. The anti-detachment structure for pins in an automotive parts mold according to claim 1, characterized in that, The other end of the outer wall of the second rotating tube (301) is rotatably connected to the inner wall of the fixed sleeve (109), and the second movable seat (304) is slidably connected to multiple second limiting rods (108). In the combined state, multiple second expansion plates (307) are all in contact with the inner wall of the corresponding mounting hole on the second mold (6).

5. The anti-detachment structure for pins in an automotive parts mold according to claim 1, characterized in that, In the combined state, the limiting disk (402) is close to the two limiting balls (406) through the convex ring (403).

6. The anti-detachment structure for pins in an automotive parts mold according to claim 1, characterized in that, The two sides of the fixed plate (408) are fixedly connected to the first spring (410) and the second spring (411) respectively.

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