Servo motor foot cup stamping forming device

Abstract

The utility model discloses a kind of servo motor foot cup punch forming device, the utility model relates to foot cup stamping technical field.It includes mould base, the utility model support assembly is connected through screw rod and the thread of slider, the precise adjustment of the height of push rod can be realized, when facing the plate of different thickness and the stamping process requirement of diversification, operating personnel can conveniently adjust the position of push rod, the applicability and versatility of stamping device are enhanced, without replacing complex components can satisfy multiple production needs, reduce production cost and production preparation time, after stamping is completed, second shock absorber spring restores deformation and promotes push rod upward movement, can produce an upward push to lower mould, and by rotating screw rod make support rod upward push, drive push rod on support rod to move upward, improve demoulding efficiency, reduce the damage risk of foot cup and mould in demoulding process.

Description

Technical Field

[0001] This utility model relates to the field of foot cup stamping technology, specifically a servo motor foot cup stamping forming device. Background Technology

[0002] In modern manufacturing, servo motors are core drive components of high-precision automated equipment, and the quality of their feet plays a crucial role in the installation stability and operational reliability of the servo motor. The stamping forming device, as the main production equipment for servo motor feet, directly affects the production efficiency and product quality of the feet.

[0003] Currently, stamping devices typically have push rods at the bottom to sample the forming mold. However, existing devices are difficult to adapt to different thicknesses of sheet metal and diverse stamping process requirements. The push rods of most devices are fixed in position or inconvenient to adjust. If operators want to change the push height, they often need to replace complex parts, which is not only cumbersome to operate, but also increases production costs and preparation time. It cannot meet flexible and ever-changing production requirements, and it is not convenient to cushion and protect the forming mold during push. In terms of mold replacement, traditional stamping forming devices usually use a large number of bolts to fix the mold. The installation and disassembly process requires a lot of time and manpower. When it is necessary to change the mold to produce different specifications of foot cups, the long downtime for mold replacement seriously reduces production efficiency. Therefore, this utility model provides a servo motor foot cup stamping forming device. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a servo motor-driven foot cup stamping forming device. This solves the problems of existing devices being unable to adapt to different thicknesses of sheet metal and diverse stamping process requirements. In most devices, the position of the pushing component is fixed or inconvenient to adjust. If operators want to change the pushing height, they often need to replace complex components, which is not only cumbersome but also increases production costs and preparation time, failing to meet flexible and varied production requirements. Furthermore, it is inconvenient to cushion and protect the forming mold during pushing. Regarding mold replacement, traditional stamping forming devices typically use a large number of bolts to fix the mold, requiring significant time and manpower for installation and disassembly. When it is necessary to change the mold to produce foot cups of different specifications, the long downtime for mold replacement severely reduces production efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a servo motor foot cup stamping forming device, comprising a mold base, wherein the mold base is provided with a processing mechanism for servo motor foot cup stamping forming, the processing mechanism comprising: The push assembly includes a first cavity groove opened at the bottom of the mold base, a slide rail bracket fixed at the bottom of the first cavity groove, a support rod connected by a support assembly inside the slide rail bracket, and a push rod connected by a buffer assembly inside the support rod. The disassembly assembly includes second cavity slots opened on both sides of the mold base. The inner wall of the second cavity slot is fixed with a movable plate connected by an elastic component. The movable plate is fixed with a locking block near the inner wall of the mold base. A forming mold is slidably connected inside the mold base. The two side walls of the forming mold are provided with locking grooves corresponding to the locking blocks.

[0006] Preferably, the support assembly includes a slider slidably connected to the inner wall of the slide rail bracket, a lead screw rotatably connected to the slide rail bracket in the horizontal direction, the slider and the lead screw being threadedly connected, a movable rod rotatably connected to the upper end of the slider via a rotating shaft, the support rod being located inside the upper end of the first cavity groove, and the support rod being slidably connected to the interior of the mold base, the bottom end of the support rod being rotatably connected to the other end of the movable rod via a rotating shaft, and a limit plate being fixed to the outer wall of the support rod.

[0007] Preferably, the buffer assembly includes a second damping spring fixed inside the support rod, a push rod located at the upper end of the second damping spring and fixedly connected, the push rod being slidably connected to the support rod, and a second damping support rod provided on the inner ring of the second damping spring, the second damping support rod being fixedly connected to the support rod.

[0008] Preferably, a positioning protrusion is fixed at the upper edge of the forming mold, and a positioning groove connected to the positioning protrusion is provided on the upper surface of the mold base.

[0009] Preferably, the elastic component includes a compression spring fixed to the inner wall of the second cavity groove, the movable plate being fixedly connected to the end of the compression spring, and the movable plate being slidably connected to the inner wall of the second cavity groove. A pull rod is fixed to one side wall of the movable plate, and the pull rod extends to the outer wall of the mold base in a slidably connected manner.

[0010] Preferably, a mounting bracket is fixed to the rear side wall of the mold base, a hydraulic rod is fixed to the top of the mounting bracket, a stamping die is fixed to the telescopic end of the hydraulic rod, four sets of movable slots are opened on the upper surface of the mold base, a positioning rod is fixed to the bottom of the movable slot, the stamping die is slidably connected to the positioning rod, a first damping spring is provided at the bottom of the movable slot outside the positioning rod, a buffer block is fixed to the upper end of the first damping spring, a rubber pad is fixed to the upper surface of the buffer block, the buffer block and the rubber pad are slidably connected to the positioning rod, and a first damping support rod is provided at the bottom of the movable slot between the first damping spring and the positioning rod.

[0011] Beneficial effects This invention provides a servo motor foot cup stamping forming device. Compared with the prior art, it has the following advantages: Firstly, this invention, through the readjustment of the support rod and push rod positions by the support assembly, and the cooperation of the second damping spring and the second damping support rod in the buffer assembly, can quickly and effectively absorb the impact force generated during the stamping process. Compared with traditional stamping devices, it greatly reduces equipment vibration, not only protecting the mold base and mold components, reducing the risk of equipment damage caused by vibration, and extending the service life of the equipment, but also avoiding the problem of decreased stamping accuracy caused by vibration, thus improving the stamping quality of the servo motor foot cup. The threaded connection between the lead screw and the slider in the support assembly allows for adjustment of the push rod height. Precise adjustment allows operators to easily adjust the position of the ejector pin when facing sheet metal of different thicknesses and diverse stamping process requirements. This enhances the applicability and versatility of the stamping device, meeting various production needs without the need to replace complex parts. It reduces production costs and preparation time. After stamping, the second damping spring recovers its deformation and pushes the ejector pin upward, generating an upward thrust on the lower die. The upward push of the support rod by rotating the lead screw also drives the ejector pin on the support rod to move upward, improving demolding efficiency and reducing the risk of damage to the feet and die during demolding.

[0012] Secondly, the pull rod of this utility model drives the movable plate to slide in the second cavity groove, and the compression spring is compressed again, causing the locking block to exit from the locking groove. This allows the molding mold to be easily removed from the mold base for replacement. Through the cooperation of the compression spring and the locking block, the molding mold can be quickly installed and disassembled without the need for complicated tools and cumbersome operations. Operators only need to pull the pull rod to disassemble the mold, and during installation, they only need to push the mold into the corresponding position. The operation process is simple and easy to understand, reducing the labor intensity and skill requirements of operators. Compared with the traditional method of fixing the mold with a large number of bolts, it greatly shortens the mold replacement time, reduces downtime, and improves production efficiency. In addition, the positioning protrusion on the molding mold and the positioning groove on the mold base cooperate to ensure that the molding mold is accurately positioned during installation, improving the positioning accuracy of the mold. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of this utility model; Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the internal structure of the movable groove of this utility model.

[0014] In the diagram: 1. Mold base; 2. Mounting bracket; 201. Hydraulic rod; 202. Stamping die; 3. Movable groove; 301. Positioning rod; 302. First damping spring; 303. Buffer block; 304. Rubber pad; 305. First damping support rod; 4. First cavity groove; 401. Slide rail bracket; 402. Slider; 403. Lead screw; 404. Movable rod; 405. Support rod; 406. Limiting plate; 5. Second damping spring; 501. Second damping support rod; 502. Push rod; 6. Forming die; 601. Positioning protrusion; 602. Positioning groove; 7. Locking groove; 701. Second cavity groove; 702. Compression spring; 703. Movable plate; 704. Locking block; 705. Pull rod. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-4 This utility model provides a technical solution: a servo motor foot cup stamping forming device, including a mold base 1, on which a processing mechanism for servo motor foot cup stamping forming is provided, the processing mechanism including: The push assembly includes a first cavity groove 4 opened at the bottom of the mold base 1. A slide rail bracket 401 is fixed at the bottom of the first cavity groove 4. A support rod 405 connected by a support assembly is provided inside the slide rail bracket 401. A push rod 502 connected by a buffer assembly is provided inside the support rod 405. The disassembly assembly includes a second cavity groove 701 opened on both sides of the mold base 1. The inner wall of the second cavity groove 701 is fixed with a movable plate 703 connected by an elastic component. The movable plate 703 is fixed with a locking block 704 near the inner side wall of the mold base 1. A forming mold 6 is slidably connected inside the mold base 1. The two side walls of the forming mold 6 are provided with locking grooves 7 corresponding to the locking blocks 704.

[0017] In a preferred embodiment, the support assembly includes a slider 402 slidably connected to the inner wall of a slide rail bracket 401. A lead screw 403 is rotatably connected to the slide rail bracket 401 in the horizontal direction. The slider 402 and the lead screw 403 are threaded together. A movable rod 404 is rotatably connected to the upper end of the slider 402 via a rotating shaft. A support rod 405 is located inside the upper end of the first cavity groove 4, and the support rod 405 is slidably connected to the interior of the mold base 1. The bottom end of the support rod 405 is rotatably connected to the other end of the movable rod 404 via a rotating shaft. A limit plate 406 is fixed to the outer wall of the support rod 405. The buffer assembly includes a second damping spring 5 fixed inside the support rod 405. A push rod 502 is fixedly connected to the upper end of the second damping spring 5. The push rod 502 is slidably connected to the support rod 405. The inner ring of the second damping spring 5 is provided with a second damping support rod 501, which is fixedly connected to the support rod 405. When the lead screw 403 is rotated, since the lead screw 403 is threadedly connected to the slider 402, the slider 402 will slide horizontally along the inner wall of the slide rail bracket 401, driving the movable rod 404 to rotate, thereby pushing the support rod 405 to slide up and down inside the mold base 1. When stamping, the upper mold moves downward to apply pressure to the sheet metal, and the lower mold receives a reaction force that is transmitted to the mold base 1. The push rod 502 first contacts the lower mold and is squeezed, and will slide downward along the support rod 405, compressing the second damping spring 5. At the same time, the second damping support rod 501 restricts the push rod 502. The movement of spring 2 acts as a damping buffer, absorbing the impact force generated during stamping. After stamping, the second damping spring 5 gradually recovers its deformation, pushing the push rod 502 upward to reset, slightly lifting the lower die to assist in demolding. If the height of the push rod 502 needs to be adjusted to adapt to different stamping requirements, the lead screw 403 can be rotated again, and the positions of the support rod 405 and the push rod 502 can be readjusted through the support assembly. The second damping spring 5 and the second damping support rod 501 in the buffer assembly work together to quickly and effectively absorb the impact force generated during stamping. Compared with traditional stamping devices, this greatly reduces equipment vibration, protecting the die base 1 and die components, reducing the risk of equipment damage caused by vibration, and extending the service life of the equipment. This design not only prevents a decrease in stamping accuracy due to vibration, but also improves the stamping quality of the servo motor foot cup. The support assembly, connected to the slider 402 via a lead screw 403, allows for precise adjustment of the height of the push rod 502. When faced with plates of varying thicknesses and diverse stamping process requirements, operators can easily adjust the position of the push rod 502, enhancing the applicability and versatility of the stamping device. It can meet various production needs without replacing complex components, reducing production costs and preparation time. After stamping, the second damping spring 5 recovers its deformation, pushing the push rod 502 upwards, generating an upward pushing force on the lower die, and also pushing the support rod 405 upwards by rotating the lead screw 403.This causes the push rod 502 on the support rod 405 to move upwards, improving demolding efficiency and reducing the risk of damage to the mold feet and mold during demolding.

[0018] In a preferred embodiment, a positioning protrusion 601 is fixed at the upper edge of the molding die 6, and a positioning groove 602 connected to the positioning protrusion 601 is provided on the upper surface of the mold base 1. The elastic component includes a compression spring 702 fixed to the inner wall of the second cavity groove 701, a movable plate 703 fixedly connected to the end of the compression spring 702, and the movable plate 703 is slidably connected to the inner wall of the second cavity groove 701. A pull rod 705 is fixed to one side wall of the movable plate 703, and the pull rod 705 extends to the outer wall of the mold base 1 and is slidably connected. The molding die 6 is placed on the mold base 1, so that the locking grooves 7 on both sides of the molding die 6 are aligned with the locking blocks 704 in the second cavity grooves 701 on both sides of the mold base 1. At the same time, the positioning protrusion 601 at the upper edge of the molding die 6 is embedded into the positioning groove 602 on the upper surface of the mold base 1, pushing the molding die 6 to slide inward to the mold base 1. When the molding die 6 needs to be replaced, the pull rod 705 is pulled. The pull rod 705 drives the movable plate 703 to slide within the second cavity groove 701, and the compression spring 702 is compressed again, causing the locking block 704 to exit from the locking groove 7. The molding mold 6 can be easily removed from the mold base 1 for replacement. Through the cooperation of the compression spring 702 and the locking block 704, the molding mold 6 can be quickly installed and disassembled without the need for complicated tools and cumbersome operations. The operator only needs to pull the pull rod 705 to disassemble the mold, and push the mold into the corresponding position during installation. The operation process is simple and easy to understand, reducing the labor intensity and skill requirements of the operator. Compared with the traditional method of fixing the mold with a large number of bolts, it greatly shortens the mold replacement time, reduces downtime, and improves production efficiency. In addition, the positioning protrusion 601 on the molding mold 6 cooperates with the positioning groove 602 on the mold base 1 to ensure that the molding mold 6 is accurately positioned during installation, improving the positioning accuracy of the mold.

[0019] In a preferred embodiment, a mounting bracket 2 is fixed to the rear side wall of the mold base 1. A hydraulic rod 201 is fixed to the top of the mounting bracket 2. A stamping die 202 is fixed to the telescopic end of the hydraulic rod 201. Four sets of movable grooves 3 are provided on the upper surface of the mold base 1. A positioning rod 301 is fixed to the bottom of the movable groove 3. The stamping die 202 is slidably connected to the positioning rod 301. A first damping spring 302 is provided at the bottom of the movable groove 3 outside the positioning rod 301. A buffer block 303 is fixed to the upper end of the first damping spring 302. A rubber pad 304 is fixed to the upper surface of the buffer block 303. The buffer block 303 and the rubber pad 304 are slidably connected to the positioning rod 301. The bottom of the movable groove 3 is located between the first damping spring 302 and the positioning rod 301. A first damping support rod 305 is installed. When the equipment starts, the telescopic end of the hydraulic rod 201 pushes the stamping die 202 downward to stamp the sheet metal placed on the die base 1. During the downward movement, the stamping die 202 contacts the sheet metal and applies pressure, while simultaneously experiencing a reaction force. Since the stamping die 202 is slidably connected to the positioning rod 301, the reaction force causes the stamping die 202 to squeeze the buffer block 303 and the rubber pad 304. The buffer block 303 compresses the first shock-absorbing spring 302 downward, causing the first shock-absorbing spring 302 to undergo elastic deformation and absorb the impact force. At the same time, the first damping support rod 305 plays its role, limiting the movement speed of the buffer block 303, making the buffering process smoother and preventing excessive vibration of the stamping die 202. After stamping is completed, the hydraulic rod 201 drives the stamping die 202 to move upward. At this time, the first damping spring 302 begins to recover its deformation, pushing the buffer block 303 and rubber pad 304 to reset upward, thereby lifting the stamping die 202 upward and returning it to its initial position, preparing it for the next stamping. The first damping spring 302 and the first damping support rod 305 work together to effectively absorb and buffer the reaction force on the stamping die 202 during the stamping process, greatly reducing the vibration amplitude of the equipment, protecting the stamping die 202 and die base 1, as well as the sliding connection between the stamping die 202 and the positioning rod 301, providing precise guidance and positioning for the up and down movement of the stamping die 202, ensuring the stamping die 202 remains stable during the stamping process. 02 can move stably along the predetermined direction, avoiding deviation or shaking, ensuring the accuracy of the stamping position, thereby improving the dimensional accuracy and consistency of the product. The setting of buffer block 303 and rubber pad 304 further enhances the buffer protection of stamping die 202. Rubber pad 304 has good elasticity and wear resistance, and can play a buffering and shock absorption role between stamping die 202 and buffer block 303, reducing the direct collision and friction between the two, reducing the wear degree of stamping die 202, and at the same time absorbing some vibration energy, improving the stability of equipment operation. This part has a simple structural design. Through the combination of components such as movable groove 3, positioning rod 301, and first shock absorption spring 302, the functions of buffering, shock absorption and guiding positioning are realized.

[0020] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0021] During operation, the molding die 6 is placed on the die base 1, aligning the locking grooves 7 on both sides of the molding die 6 with the locking blocks 704 in the second cavity grooves 701 on both sides of the die base 1. Simultaneously, the positioning protrusion 601 at the upper edge of the molding die 6 is inserted into the positioning groove 602 on the upper surface of the die base 1, pushing the molding die 6 to slide inwards towards the die base 1. When the molding die 6 needs to be replaced, the pull rod 705 is pulled, causing the movable plate 703 to slide within the second cavity groove 701, compressing the spring 702 again. Compression causes the locking block 704 to disengage from the locking groove 7, allowing the forming mold 6 to be easily removed from the mold base 1 for replacement. Through the cooperation of the compression spring 702 and the locking block 704, the forming mold 6 can be quickly installed and removed without complex tools or cumbersome operations. During stamping, the telescopic end of the hydraulic rod 201 pushes the stamping mold 202 downwards, stamping the sheet metal placed on the mold base 1. During its downward movement, the stamping mold 202 contacts the sheet metal and applies pressure. Simultaneously, it will be subjected to a reaction force. Since the stamping die 202 is slidably connected to the positioning rod 301, the reaction force will cause the stamping die 202 to squeeze the buffer block 303 and the rubber pad 304. The buffer block 303 will compress the first damping spring 302 downwards, and the first damping spring 302 will undergo elastic deformation to absorb the impact force. At the same time, the first damping support rod 305 will play a role in limiting the movement speed of the buffer block 303, making the buffering process more stable and avoiding excessive vibration of the stamping die 202. After stamping is completed, the hydraulic rod 201... The stamping die 202 is driven to move upward. At this time, the first damping spring 302 begins to recover its deformation, pushing the buffer block 303 and rubber pad 304 to reset upward, thereby lifting the stamping die 202 upward and returning it to its initial position, preparing it for the next stamping. The first damping spring 302 and the first damping support rod 305 work together to effectively absorb and buffer the reaction force on the stamping die 202 during the stamping process, greatly reducing the vibration amplitude of the equipment and protecting the stamping die 202 and die base 1 and other components. During stamping, the upper die moves downward to apply pressure to the sheet metal, and the lower die receives a reaction force that is transmitted to the die base 1. The push rod 502 first contacts the lower die and is squeezed, and slides downward along the support rod 405, compressing the second damping spring 5. At the same time, the second damping support rod 501 restricts the movement of the push rod 502, playing a damping and buffering role to absorb the impact force generated by stamping. After stamping is completed, the second damping spring 5 gradually recovers its deformation, pushing the push rod 502 upward to reset, slightly lifting the lower die to assist in demolding. If it is necessary to adjust the height of the push rod 502 to adapt to different stamping requirements, the lead screw 403 can be rotated again to readjust the positions of the support rod 405 and the push rod 502 through the support assembly.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A servo motor foot cup stamping forming device, comprising a mold base (1), characterized in that: The mold base (1) is provided with a processing mechanism for stamping and forming the foot cup of the servo motor. The processing mechanism includes: The push assembly includes a first cavity groove (4) opened at the bottom of the mold base (1), a slide rail bracket (401) fixed at the bottom of the first cavity groove (4), a support rod (405) connected by a support assembly is provided inside the slide rail bracket (401), and a push rod (502) connected by a buffer assembly is provided inside the support rod (405). The disassembly assembly includes a second cavity groove (701) opened on both sides of the mold base (1). The inner wall of the second cavity groove (701) is fixed with a movable plate (703) connected by an elastic component. The movable plate (703) is fixed with a locking block (704) near the inner side wall of the mold base (1). The mold base (1) is slidably connected with a forming mold (6). The two side walls of the forming mold (6) are provided with locking grooves (7) corresponding to the locking blocks (704).

2. The servo motor foot cup stamping forming device according to claim 1, characterized in that: The support assembly includes a slider (402) slidably connected to the inner wall of a slide rail bracket (401), a lead screw (403) rotatably connected to the slide rail bracket (401) in the horizontal direction, the slider (402) and the lead screw (403) being threadedly connected, an movable rod (404) rotatably connected to the upper end of the slider (402) via a rotating shaft, a support rod (405) located inside the upper end of the first cavity groove (4), and the support rod (405) being slidably connected to the interior of the mold base (1), the bottom end of the support rod (405) being rotatably connected to the other end of the movable rod (404) via a rotating shaft, and a limit plate (406) fixed to the outer wall of the support rod (405).

3. The servo motor foot cup stamping forming device according to claim 1, characterized in that: The buffer assembly includes a second damping spring (5) fixed inside the support rod (405), a push rod (502) located at the upper end of the second damping spring (5) and fixedly connected, the push rod (502) and the support rod (405) being slidably connected, and a second damping support rod (501) provided on the inner ring of the second damping spring (5), the second damping support rod (501) being fixedly connected to the support rod (405).

4. The servo motor foot cup stamping forming device according to claim 1, characterized in that: The upper edge of the molding die (6) is fixed with a positioning protrusion (601), and the upper surface of the die base (1) is provided with a positioning groove (602) that connects with the positioning protrusion (601).

5. The servo motor foot cup stamping forming device according to claim 1, characterized in that: The elastic component includes a compression spring (702) fixed to the inner wall of the second cavity groove (701), a movable plate (703) fixedly connected to the end of the compression spring (702), and the movable plate (703) is slidably connected to the inner wall of the second cavity groove (701). A pull rod (705) is fixed to one side wall of the movable plate (703), and the pull rod (705) extends to the outer wall of the mold base (1) in a slidable connection.

6. The servo motor foot cup stamping forming device according to claim 1, characterized in that: A mounting bracket (2) is fixed to the rear side wall of the mold base (1). A hydraulic rod (201) is fixed to the top of the mounting bracket (2). A stamping die (202) is fixed to the telescopic end of the hydraulic rod (201). Four sets of movable grooves (3) are opened on the upper surface of the mold base (1). A positioning rod (301) is fixed to the bottom end of the movable groove (3). The stamping die (202) is slidably connected to the positioning rod (301). The bottom of the movable groove (3) is located at the fixed position. A first damping spring (302) is provided on the outside of the positioning rod (301). A buffer block (303) is fixed at the upper end of the first damping spring (302). A rubber pad (304) is fixed on the upper surface of the buffer block (303). The buffer block (303) and the rubber pad (304) are slidably connected to the positioning rod (301). A first damping support rod (305) is provided at the bottom of the movable groove (3) between the first damping spring (302) and the positioning rod (301).

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