Demolding ejector rod of multi-layer inverted buckle structure at radar hole

Abstract

The invention relates to the technical field of mold manufacturing, in particular to a demolding ejector rod of a multi-layer inverted buckle structure at a radar hole, the demolding ejector rod comprises a fixing seat, a forming insert and a core pulling block, the forming insert is fixedly connected to the fixing seat and sleeves the core pulling block, and a mold cavity is formed between the forming insert and the core pulling block; the core pulling block comprises a first sliding part and a second sliding part, the first sliding part and the second sliding part are both connected to the fixed seat in a sliding mode, and the sliding direction of the first sliding part is perpendicular to the sliding direction of the second sliding part; a driver used for driving the first sliding part to move is arranged in the fixing base, a linkage assembly is connected between the first sliding part and the second sliding part, and the side face, away from the first sliding part, of the second sliding part is fixedly connected with an inverted buckle forming block. The problems encountered in the demolding process of complex parts are effectively solved, and the mold manufacturing precision and the production efficiency are remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of mold manufacturing, and in particular to a demoulding ejector pin with a multi-layer undercut structure at a radar hole. Background Art

[0002] In the field of mechanical manufacturing, especially in the molding process of plastic parts, the application of complex structural design is increasing, which has promoted the improvement of product functionality and aesthetics. Especially in the automotive industry, the design of radar holes has become a key part of supporting advanced driver assistance systems. With the development of technology, the processing accuracy and production efficiency of parts have been continuously improved, driving the technological innovation of the entire manufacturing industry. However, this complex design also brings new challenges to mold manufacturing.

[0003] There are two solutions to the problem of forming radar holes in the front bumper of automobiles: one is the separated insert design, which realizes forming and demoulding during the opening and closing of the mold by fixing the movable insert on the mold; the other is the solution of combining the movable insert with the slider, which uses the sliding mechanism to form more complex shape changes. Both methods have solved the problem of complex structure forming to a certain extent.

[0004] However, the existing solutions of separate inserts and movable inserts plus sliders still have great difficulties in the demoulding process. Especially in the multi-layer undercut structure, the demoulding process is not only complicated, but also easily leads to a decrease in molding quality, and cannot ensure the accurate molding and efficient demoulding of the radar hole. This has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to effectively improve the demoulding efficiency of the automobile shell, the present application improves the demoulding ejector pin of the multi-layer undercut structure at the radar hole.

[0006] The purpose of this application is to provide a demoulding ejector with a multi-layer undercut structure at a radar hole, which adopts the following technical solution: A demoulding ejector rod with a multi-layer undercut structure at a radar hole comprises a fixed seat, a forming insert and a core pulling block, wherein the forming insert is fixedly connected to the fixed seat and sleeved on the outside of the core pulling block, and a mold cavity is formed between the forming insert and the core pulling block; the core pulling block comprises a first sliding part and a second sliding part, both of which are slidably connected to the fixed seat, and the sliding direction of the first sliding part is perpendicular to the sliding direction of the second sliding part; a driver for driving the first sliding part to move is arranged in the fixed seat, a linkage assembly is connected between the first sliding part and the second sliding part, and an undercut forming block is fixedly connected to the side of the second sliding part away from the first sliding part.

[0007] By adopting the above technical solution, a demoulding ejector with a multi-layer undercut structure at the radar hole is realized, which can effectively solve the problem that parts with complex shapes are difficult to demould in traditional molds. Specifically, the interaction between the molding insert and the core pulling block on the fixed seat forms a stable mold cavity structure, which is convenient for manufacturing products with multi-layer undercut structures. At the same time, the vertical sliding characteristics of the first sliding part and the second sliding part and the coordinated work of the driver and the linkage assembly enable the core pulling block to accurately execute complex motion trajectories, thereby realizing reliable demoulding action of the undercut molding block. This design not only improves production efficiency, but also enhances the quality stability of the product.

[0008] Optionally, the linkage assembly includes a push-pull groove and a push-pull block, the push-pull groove is arranged on the side of the first sliding part and extends along the sliding direction of the first sliding part; the push-pull block is fixedly connected to the side of the second sliding part, and the push-pull block is slidably matched with the push-pull groove; the push-pull groove is arranged obliquely inward along the direction of the undercut forming block toward the driver.

[0009] By adopting the above technical solution, the cooperation between the push-pull groove and the push-pull block enables the first sliding part and the second sliding part to be stably linked. The push-pull groove arranged obliquely inward helps the second sliding part to form a stable demolding action with the undercut forming block when sliding in the vertical direction, thereby improving the reliability of the demolding process.

[0010] Optionally, the second sliding part includes a sliding block and an auxiliary strip, the sliding block is slidably connected to a side of the fixing seat facing the forming insert; the auxiliary strip is fixedly connected to the sliding block, and the undercut forming block is fixedly connected to a side of the auxiliary strip away from the first sliding part.

[0011] By adopting the above technical solution, the second sliding part can slide stably on the fixed seat, and the undercut forming block is effectively connected to the sliding block through the auxiliary strip, thereby ensuring the stability and reliability of the undercut forming block during use. Specifically, the sliding block can slide smoothly on the fixed seat, and the design of the auxiliary strip enables the undercut forming block to be firmly mounted thereon, thereby ensuring the smooth operation of the entire structure in the working state.

[0012] Optionally, a rolling groove is provided on the surface of the sliding block facing the fixed seat, and a rolling body is built in the rolling groove.

[0013] By adopting the above technical solution, a rolling groove is provided on the surface of the sliding block facing the fixed seat, and a rolling body is built in the rolling groove, which can effectively reduce the friction between the sliding block and the fixed seat, improve the smoothness and stability of the sliding of the sliding block, and extend the service life of the device.

[0014] Optionally, a connecting rod is provided on the fixing seat, a connecting groove matching the connecting rod is provided on the forming insert, and a fixing mechanism for fixing the connecting rod in the connecting groove is configured on the forming insert.

[0015] By adopting the above technical solution, the connection between the fixing seat and the forming insert is more stable, easy to assemble and disassemble, and improves production efficiency. By setting the connecting rod to match the connecting groove and configuring a fixing mechanism to fix the connecting rod in the connecting groove, the stability of the structure is further enhanced, ensuring that it will not loosen or fall off due to external force during use.

[0016] Optionally, the fixing mechanism includes a locking block and a locking groove, the inner wall of the connecting groove is provided with a sliding groove, and the locking block slides in the sliding groove; the locking groove is formed on the outer surface of the connecting rod and is plugged into the locking block; the molding insert is provided with a guide hole connected to the sliding groove, and a guide rod connected to the locking block is provided in the guide hole.

[0017] By adopting the above technical solution, the locking block in the fixing mechanism can slide in the sliding groove and be plugged into the locking groove on the connecting rod, thereby realizing rapid fixing and disassembly of the connecting rod in the forming insert, thereby improving assembly efficiency.

[0018] Optionally, a locking spring is provided in the sliding groove, one end of the locking spring is fixedly connected to the sliding groove wall, and the other end of the locking spring is fixedly connected to the locking block, and the locking block is inclined toward the end surface of the fixed seat.

[0019] By adopting the above technical solution, the setting of the locking spring can make the locking block automatically insert into the locking groove when no external force is applied, so as to realize the rapid locking between the connecting rod and the connecting groove, thereby ensuring the stable connection between the forming insert and the fixing seat. The end surface of the locking block facing the fixing seat is inclined, so that it is easy to shrink into the sliding groove under the action of external force, simplifying the assembly process and improving the assembly efficiency.

[0020] Optionally, a handle is provided at one end of the guide rod away from the locking block, and a groove for storing the handle is provided on the side of the molding insert.

[0021] By adopting the above technical solution, a handle is provided at the end of the guide rod away from the locking block, and a groove for storing the handle is provided on the side of the molding insert, so that the operator can pull the locking block by the handle, thereby conveniently and quickly separating the locking block from the locking groove, thereby improving the operating convenience of the fixing mechanism and the assembly efficiency of the demolding ejector rod.

[0022] Optionally, one end of the core pulling block away from the fixed seat is tapered, and the diameter of the end of the core pulling block away from the fixed seat is smaller than the diameter of the end of the core pulling block close to the fixed seat.

[0023] By adopting the above technical solution, the end of the core pulling block away from the fixed seat is designed to be conical, and the diameter of this end is smaller than the diameter of the end close to the fixed seat, thereby achieving efficient demolding of the core pulling block during the demolding process, reducing sticking and improving the demolding success rate.

[0024] In summary, this application at least includes the following beneficial technical effects: 1. By setting the mold cavity structure between the fixed seat, the molding insert and the core pulling block, and combining the linkage assembly of the first sliding part and the second sliding part, the precise molding and smooth demoulding of the multi-layer undercut structure can be achieved, which solves the problem that the demoulding process is complicated and easily leads to a decrease in molding quality in the prior art; 2. Through the push-pull groove and the push-pull block structure set between the first sliding part and the second sliding part, and the oblique inward tilt setting of the push-pull groove, the sliding action can be smoothly completed under the drive of the driver, thereby improving the stability and reliability during demoulding; 3. By setting the rolling groove and built-in rolling body on the sliding block, the friction between the sliding block and the fixed seat can be reduced during the sliding process, further ensuring the smoothness of the demoulding operation and improving the demoulding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial structural schematic diagram of a demoulding ejector rod of a multi-layer undercut structure at a radar hole in an embodiment of the present application; Figure 2 It is a structural cross-sectional view of the first embodiment of the present application, which is mainly used to show the connection diagram of the fixing seat, the forming insert, the core pulling block and the driver; Figure 3 It is a partial structural cross-sectional view of the second embodiment of the present application, mainly used to show the connection diagram of the fixing seat and the forming insert; Figure 4 yes Figure 3 Enlarged view of part A.

[0026] Explanation of the reference numerals: 1. fixing seat; 2. forming insert; 3. core pulling block; 31. first sliding part; 32. second sliding part; 4. driver; 5. linkage assembly; 51. push-pull groove; 52. push-pull block; 6. inverted forming block; 7. sliding block; 8. auxiliary strip; 9. rolling groove; 10. rolling body; 11. connecting rod; 12. connecting groove; 13. fixing mechanism; 131. locking block; 132. locking groove; 133. sliding groove; 14. guide hole; 15. guide rod; 16. locking spring; 17. handle; 18. groove. DETAILED DESCRIPTION

[0027] The following will be combined with the attached Figure 1-4, the technical solutions in the embodiments of the present invention are clearly and completely described. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0028] The inventor of the present application has found that the multi-layer undercut structure at the radar hole is prone to jamming during the demoulding process. To this end, the present application mainly adopts the following technical solutions: a demoulding ejector rod of the multi-layer undercut structure at the radar hole, referring to Figure 1 and Figure 2 , including a fixed seat 1, a molding insert 2 and a core pulling block 3, the molding insert 2 is fixedly connected to the fixed seat 1, and the molding insert 2 is sleeved on the outside of the core pulling block 3, and a mold cavity is formed between the molding insert 2 and the core pulling block 3; the core pulling block 3 includes a first sliding part 31 and a second sliding part 32, the first sliding part 31 and the second sliding part 32 are both slidably connected to the fixed seat 1, and the sliding direction of the first sliding part 31 is perpendicular to the sliding direction of the second sliding part 32; a driver 4 for driving the first sliding part 31 to move is arranged in the fixed seat 1, a linkage component 5 is connected between the first sliding part 31 and the second sliding part 32, and an undercut molding block 6 is fixedly connected on the side of the second sliding part 32 away from the first sliding part 31, so that the design of the multi-layer undercut structure makes demoulding smoother, avoids the occurrence of jamming, and improves production efficiency.

[0029] Example 1 The demoulding ejector rod of the multi-layer undercut structure at the radar hole provided in the embodiment of the present application is shown in FIG. Figure 1 and Figure 2 , including a fixed seat 1, a molding insert 2 and a core pulling block 3, wherein the core pulling block 3 includes a first sliding part 31 and a second sliding part 32, a driver 4 for driving the first sliding part 31 to move is arranged in the fixed seat 1, a linkage component 5 is connected between the first sliding part 31 and the second sliding part 32, and an undercut molding block 6 is fixedly connected to the side of the second sliding part 32 away from the first sliding part 31, so that the demoulding is smoother through the design of the multi-layer undercut structure, the occurrence of the jamming phenomenon is avoided, and the production efficiency is improved.

[0030] Specifically, the fixing seat 1 can be made of high-strength steel or alloy materials to ensure sufficient rigidity and strength. For example, the material of the fixing seat 1 can be cast iron material, or aluminum alloy or other alloy materials, such as special stainless steel. The specific structure of the fixing seat 1 is designed according to actual needs, and different fixing methods can be used, such as bolts, welding or other mechanical fixing methods. The size and shape of the fixing seat 1 can be adjusted according to the specific application scenario to ensure stable installation. For example, the fixing seat 1 can be designed as a flat plate or U-shaped structure.

[0031] The forming insert 2 can also be made of high-strength materials, such as stainless steel or hard alloy. The specific shape of the forming insert 2 can be customized according to the desired formed product. For example, the forming insert 2 can be cylindrical, rectangular or other special shapes. The forming insert 2 is fixed to the fixing seat 1 by means of screws, keyways, etc. In addition, in order to improve wear resistance and corrosion resistance, chrome plating or spraying of wear-resistant coating can be performed on the surface of the forming insert 2.

[0032] The core pulling block 3 is usually made of a high-hardness alloy material to facilitate the demoulding operation after molding. The outer diameter of the core pulling block 3 gradually tapers to form a tapered structure, which is convenient for smooth exit during the demoulding process. Reinforcement ribs can be provided inside the core pulling block 3 to increase its stability. For example, the reinforcement ribs can be arranged crosswise or spirally. The core pulling block 3 can also be provided with a lubricating coating on its outside to reduce friction and increase service life. The outer surface of the core pulling block 3 can also be further polished to reduce surface roughness and improve demoulding performance.

[0033] The first sliding part 31 mainly includes a slide rail and a slider. The slide rail can be a linear guide rail or a ball screw. The slide rail material can be copper alloy or steel, which has good wear resistance. The slider can be made of bearing steel or ceramic material to ensure low friction resistance and smooth operation. The slide rail and the slider are precisely matched. For example, the slide rail can be a U-shaped track, and the slider is embedded in the track and fits tightly with it to ensure that there is no looseness during the sliding process.

[0034] The second sliding part 32 includes a sliding block 7 and an auxiliary strip 8. The sliding block 7 is usually a straight plate-like structure, which can slide freely on the fixed seat 1. The contact area between the sliding block 7 and the fixed seat 1 is large, which can reduce the unit pressure and prevent wear. The material of the sliding block 7 can be selected from high-strength steel or copper alloy. The auxiliary strip 8 can be a flat long strip structure, fixed on one side of the sliding block 7, and plays a stabilizing role. The material of the auxiliary strip 8 is usually selected from carbon fiber composite materials or high-strength aluminum alloy.

[0035] The linkage assembly 5 is mainly composed of a push-pull groove 51 and a push-pull block 52. The push-pull groove 51 is arranged on the side of the first sliding part 31 and extends along the sliding direction of the first sliding part 31. The cross-sectional shape of the push-pull groove 51 can be rectangular or V-shaped. The push-pull block 52 is fixedly connected to the side of the second sliding part 32, and the push-pull block 52 slides with the push-pull groove 51. The size of the push-pull block 52 should be appropriately larger than the width of the push-pull groove 51 to ensure that it will not detach during the sliding process. The material of the push-pull block 52 can be selected from cemented carbide, which has good wear resistance. The push-pull groove 51 is inclined inward along the direction of the undercut forming block 6 toward the driver 4. Such a design forms a stable linkage relationship between the first sliding part 31 and the second sliding part 32, which can effectively transmit power and achieve precise control.

[0036] The undercut forming block 6 is fixedly connected to the side of the second sliding part 32 away from the first sliding part 31. The specific shape of the undercut forming block 6 can be adjusted according to the structure of the actual molded part. For example, the undercut forming block 6 can be cylindrical or rectangular to adapt to molded parts of different shapes. The material of the undercut forming block 6 can also be selected from high-hardness alloy materials to improve wear resistance. The surface of the undercut forming block 6 is polished to reduce surface roughness and improve demoulding effect.

[0037] The implementation principle of this embodiment is: Through the use of the fixed seat 1, the molding insert 2 and the core pulling block 3, a demoulding ejector with a multi-layer undercut structure is formed. Among them, the vertical sliding structure of the first sliding part 31 and the second sliding part 32 effectively realizes the complex demoulding process. The driver 4 in the fixed seat 1 is responsible for pushing the first sliding part 31 to move, and the linkage component 5 ensures the synchronous movement between the first sliding part 31 and the second sliding part 32. Such a design not only simplifies the demoulding process and improves work efficiency, but also ensures the quality of the molded parts. Through reasonable material selection and structural optimization, the reliability and durability of the whole machine are further improved.

[0038] Example 2 The difference between this embodiment and the above embodiment is that: Figure 3 and Figure 4 The structural design of the fixing seat 1 is further optimized, and a connecting rod 11 is added to make the connection between the fixing seat 1 and the forming insert 2 more firm and reliable.

[0039] Specifically, in addition to the basic structure mentioned above, the fixing seat 1 is also specially provided with a connecting rod 11, which is used to enhance the connection strength between the fixing seat 1 and the forming insert 2. The connecting rod 11 can be one or more, and the number is determined according to needs. For example, the connecting rod 11 can be cylindrical or prismatic. The material of the connecting rod 11 can be selected from high-strength steel or alloy materials, such as special steel or aluminum alloy. The length of the connecting rod 11 can be set according to actual needs. Generally, the length of the connecting rod 11 should be slightly shorter than the thickness of the fixing seat 1. The purpose of this is to avoid interfering with the movement of other components. The diameter of the connecting rod 11 is usually between 5mm and 10mm to ensure sufficient strength and stability.

[0040] A connecting groove 12 matching the connecting rod 11 is provided on the forming insert 2. The connecting groove 12 can be one or more, depending on actual needs. The specific shape of the connecting groove 12 can be determined according to the cross-sectional shape of the connecting rod 11. For example, if the connecting rod 11 is round, the connecting groove 12 is also round; if the connecting rod 11 is square, the connecting groove 12 is also square. The depth of the connecting groove 12 should be sufficient to accommodate the full length of the connecting rod 11 to ensure a tight fit between the two. The depth of the connecting groove 12 is usually between 10 mm and 20 mm to ensure the connection strength.

[0041] In addition, the molding insert 2 is provided with a fixing mechanism 13 for fixing the connecting rod 11 in the connecting groove 12. The fixing mechanism 13 includes a locking block 131 and a locking groove 132. The locking groove 132 is formed on the outer side of the connecting rod 11 and is plugged into the locking block 131. The locking block 131 can slide in the sliding groove 133 and maintain the locked state through the locking spring 16. The size of the locking block 131 should be slightly larger than the locking groove 132 to ensure that it can be fully bitten when inserted. The material of the locking block 131 can be selected from high-strength alloy steel to ensure sufficient hardness and toughness. The length of the locking groove 132 is usually between 20mm and 30mm to ensure the locking effect. The selection of the locking spring 16 is also very critical, and it should have sufficient elasticity and recovery ability. One end of the locking spring 16 is fixedly connected to the wall of the sliding groove 133, and the other end is fixedly connected to the locking block 131. The end face of the locking block 131 facing the fixing seat 1 is inclined to make it easier to insert into the locking groove 132. The locking spring 16 is usually made of spring steel wire with a diameter between 2 mm and 3 mm. In addition, in order to facilitate the operation of the locking block 131, a handle 17 can be set on the side of the molding insert 2, and the shape and size of the handle 17 can be designed according to actual conditions. For example, the handle 17 can be annular, T-shaped or other shapes that are convenient for gripping. The material of the handle 17 is usually selected from metal materials, such as aluminum alloy or stainless steel. A groove 18 for storing the handle 17 is also provided on the side of the molding insert 2 so that it can be hidden when not in use and does not affect the appearance.

[0042] The guide rod 15 is connected to the locking block 131 through the guide hole 14 to achieve smooth sliding of the locking block 131. The guide rod 15 is made of high-strength steel or hard alloy, and its diameter is usually between 3mm and 5mm to ensure sufficient strength and precision. The guide hole 14 is connected to the sliding groove 133, and the diameter of the guide hole 14 is usually slightly larger than the diameter of the guide rod 15 to ensure the guiding effect. The guide hole 14 is provided with a guide rod 15 connected to the locking block 131.

[0043] The implementation principle of this embodiment is: By adding the connecting rod 11 and the corresponding fixing mechanism 13, the connection reliability between the fixing seat 1 and the forming insert 2 is further strengthened. The cooperation between the locking block 131 and the locking groove 132, as well as the effect of the locking spring 16, make the assembly of the entire system more stable. In addition, by providing the handle 17 and the groove 18, it is convenient for operation and maintains the overall neatness and beauty. Such an optimized design not only increases the service life of the equipment, but also provides convenience for subsequent maintenance and maintenance work.

[0044] In summary, this embodiment significantly improves the overall stability and reliability of the demoulding ejector pin by optimizing the connection structure between the fixing seat 1 and the forming insert 2, thereby better meeting actual production and application requirements.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A demoulding ejector rod with a multi-layer undercut structure at a radar hole, characterized in that: The invention comprises a fixed seat (1), a molding insert (2) and a core pulling block (3), wherein the molding insert (2) is fixedly connected to the fixed seat (1), and the molding insert (2) is sleeved on the outside of the core pulling block (3), and a mold cavity is formed between the molding insert (2) and the core pulling block (3); the core pulling block (3) comprises a first sliding part (31) and a second sliding part (32), wherein the first sliding part (31) and the second sliding part (32) are both slidably connected to the fixed seat (1), and the sliding direction of the first sliding part (31) is perpendicular to the sliding direction of the second sliding part (32); a driver (4) for driving the first sliding part (31) to move is arranged in the fixed seat (1), a linkage component (5) is connected between the first sliding part (31) and the second sliding part (32), and an undercut molding block (6) is fixedly connected to the side of the second sliding part (32) away from the first sliding part (31).

2. The demoulding ejector rod of the multi-layer undercut structure at the radar hole according to claim 1, characterized in that: The linkage assembly (5) comprises a push-pull groove (51) and a push-pull block (52); the push-pull groove (51) is arranged on the side of the first sliding part (31) and extends along the sliding direction of the first sliding part (31); the push-pull block (52) is fixedly connected to the side of the second sliding part (32), and the push-pull block (52) is slidably matched with the push-pull groove (51); the push-pull groove (51) is arranged obliquely inwardly along the direction of the undercut forming block (6) toward the driver (4).

3. The demoulding ejector rod of the multi-layer undercut structure at the radar hole according to claim 1, characterized in that: The second sliding portion (32) comprises a sliding block (7) and an auxiliary strip (8); the sliding block (7) is slidably connected to a side of the fixing seat (1) facing the forming insert (2); the auxiliary strip (8) is fixedly connected to the sliding block (7); and the undercut forming block (6) is fixedly connected to a side of the auxiliary strip (8) away from the first sliding portion (31).

4. The demoulding ejector rod of the multi-layer undercut structure at the radar hole according to claim 3, characterized in that: A rolling groove (9) is provided on the surface of the sliding block (7) facing the fixed seat (1), and a rolling body (10) is built into the rolling groove (9).

5. The demoulding ejector pin of the multi-layer undercut structure at the radar hole according to claim 1, characterized in that: The fixing seat (1) is provided with a connecting rod (11), the forming insert (2) is provided with a connecting groove (12) matching the connecting rod (11), and the forming insert (2) is provided with a fixing mechanism (13) for fixing the connecting rod (11) in the connecting groove (12).

6. The demoulding ejector pin of the multi-layer undercut structure at the radar hole according to claim 5, characterized in that: The fixing mechanism (13) comprises a locking block (131) and a locking groove (132); the inner wall of the connecting groove (12) is provided with a sliding groove (133), and the locking block (131) slides in the sliding groove (133); the locking groove (132) is formed on the outer side of the connecting rod (11) and is plugged into the locking block (131); the forming insert (2) is provided with a guide hole (14) connected to the sliding groove (133), and a guide rod (15) connected to the locking block (131) is provided in the guide hole (14).

7. The demoulding ejector pin of the multi-layer undercut structure at the radar hole according to claim 6, characterized in that: A locking spring (16) is arranged in the sliding groove (133), one end of the locking spring (16) is fixedly connected to the wall of the sliding groove (133), and the other end is fixedly connected to the locking block (131), and the locking block (131) is inclined toward the end surface of the fixing seat (1).

8. The demoulding ejector pin of the multi-layer undercut structure at the radar hole according to claim 7, characterized in that: A handle (17) is provided at one end of the guide rod (15) away from the locking block (131), and a groove (18) for storing the handle (17) is provided on the side of the molding insert (2).

9. The demoulding ejector pin of the multi-layer undercut structure at the radar hole according to claim 1, characterized in that: The end of the core pulling block (3) away from the fixed seat (1) is tapered, and the diameter of the end of the core pulling block (3) away from the fixed seat (1) is smaller than the diameter of the end close to the fixed seat (1).

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