Automatic pin pulling device

Abstract

The embodiment of the utility model discloses an automatic pin pulling device which comprises a hollow base body, a first pin pulling rod and a second pin pulling rod, one end of the sliding column penetrates into the hollow inner cavity of the base body to be connected with one end of the adjusting column, and the other end is arranged on the outer side of the base body and provided with a bearing. Step surfaces are arranged on the outer sides of the sliding columns; one end of the pin pulling assembly is connected with the other end of the adjusting column, and the other end is connected with a pin pulling terminal; the guide ring is arranged in the hollow inner cavity of the base body, arranged on the outer side of the sliding column in a sleeving mode and closer to the pin pulling assembly than the step face, a second fixing hole is formed in the outer wall of the guide ring and corresponds to the first fixing hole, and when the first fixing hole corresponds to the second fixing hole, the guide ring abuts against the outer side of the sliding column through a fixing piece. The spring is arranged in the hollow inner cavity of the base body and arranged on the outer side of the sliding column in a sleeving mode, one end abuts against the step face, the other end abuts against the end face of the guide ring, and the spring is in a compressed state. The safety and reliability of insurance release are improved, and noise is reduced.

Description

Technical Field

[0001] This utility model relates to the field of track laying, and in particular to an automatic pin-removing device. Background Technology

[0002] When deploying products using a track, a safety release device is required to ensure the fire circuit system is in a safe state when the product is on track and to release the safety and reconnect the fire circuit when the product leaves the deployment platform.

[0003] Existing safety release devices are typically limit switches. When the product is on track, the limit switch is open; after derailment, the limit switch is closed, and the power circuit is connected. However, under the frictional and vibration environment of products laid on long tracks, limit switches suffer from insufficient preload and unstable travel, making the switch operation unreliable and consequently, the safety release mechanism unreliable.

[0004] There is currently no effective solution to the aforementioned problems in the existing technology. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides an automatic pin-pulling device. By incorporating a mechanical pin-pulling mechanism, the device automatically pulls the pin when it leaves the track, thus resolving the issue of unreliable locking and unlocking actions.

[0006] To achieve the above objectives, this utility model provides an automatic pin-pulling device, comprising: a base, the base being hollow and having a first fixing hole on its outer wall, the base being used to connect with a placement component; a sliding column, one end of which passes through the hollow cavity of the base and connects to one end of an adjusting column, the other end being located on the outside of the base and fitted with a bearing; the outer side of the sliding column having a stepped surface; the bearing being vertically arranged and used to cooperate with a placement track; the diameter of the adjusting column being smaller than the diameter of the hollow cavity; a pin-pulling assembly, one end of which connects to the other end of the adjusting column, the other end being used to connect to a pin-pulling terminal; and a guide ring. The guide ring is located in the hollow cavity of the base and sleeved on the outside of the sliding column, closer to the pin-pulling assembly than the stepped surface. A second fixing hole is provided on the outer wall, corresponding to the first fixing hole. When the first fixing hole and the second fixing hole correspond, a fixing member is used to press the guide ring against the outside of the sliding column. A spring is also located in the hollow cavity of the base and sleeved on the outside of the sliding column, with one end abutting against the stepped surface and the other end abutting against the end face of the guide ring, in a compressed state. When the bearing disengages from the track, the sliding column pulls the pin-pulling assembly under the spring's thrust to release the pin-pulling terminal's safety mechanism.

[0007] Optionally, the outer wall of the base near the bearing is provided with an axially arranged U-shaped groove; the outer wall of the sliding column is provided with a third fixing hole, and the limiting member passes through the U-shaped groove and is connected in the third fixing hole, the limiting member protruding from the outer wall of the base.

[0008] Alternatively, the limiting member is a screw, which is threadedly connected to the third fixing hole; or, the limiting member is a pin, which is inserted into the third fixing hole.

[0009] Further optionally, the adjusting column is axially continuous and has internal threads; when the safety is not released, a portion of the adjusting column is located in the hollow inner cavity, and the other portion is located on the outside of the base; the pull pin assembly passes through one end of the adjusting column and is threadedly connected to the adjusting column; the sliding column passes through the other end of the adjusting column and is threadedly connected to the adjusting column.

[0010] Further optionally, the pin-pulling assembly includes: an adjusting member, a connecting member, and a pin-pulling head; one end of the adjusting member is threadedly connected to the adjusting column, and the other end is connected to the pin-pulling head through the connecting member.

[0011] Optionally, the pin puller includes an integrally formed base, a first positioning piece, and a second positioning piece; the base is connected to the adjusting member via a connector; the first positioning piece and the second positioning piece protrude from the base and are arranged in parallel; threaded holes are provided at opposite positions on the first positioning piece and the second positioning piece.

[0012] Optionally, the outer wall of the base is provided with a first connecting wall in the radial direction; the outer wall of the sliding column located on the outside of the base is provided with a second connecting wall in the radial direction; the first connecting wall and the second connecting wall are provided correspondingly, and the safety screw passes through the first connecting wall and the second connecting wall to connect the base and the sliding seat, so as to ensure the compressed state of the spring before the safety is released.

[0013] Optionally, the outer wall of the substrate is provided with four first fixing holes evenly distributed circumferentially; the guide ring is provided with four second fixing holes corresponding to the four first fixing holes.

[0014] Optionally, the outer wall of the base is provided with a mounting seat, which is located on the side of the track; the bottom of the mounting seat is provided with a U-shaped hole for the track to pass through.

[0015] Further optionally, the sliding column includes a first column, a second column, and a third column with successively decreasing diameters; the step surface is formed at the junction of the first column and the second column; the second column is disposed in the hollow inner cavity, and a spring and a guide ring are sleeved on its outer side; the third column is disposed at the tail of the second column and is connected to the adjusting column.

[0016] The above technical solution has the following beneficial effects: The device has a compact structure and good versatility. The mechanical pin-pulling method ensures high reliability of operation and is suitable for automatic pin-pulling off-rail in rail-based, especially long-rail, deployment conditions. The bearing contacts the deployment track, reducing the friction between the device and the track and minimizing vibration and noise during deployment. The use of a threaded adjustable live joint mechanism ensures that after the device releases the safety screw, the pin-pulling head and the product safety terminal are reliably connected without being subjected to additional pulling force, ensuring that the product is not accidentally disarmed while on the track. The installed fixing parts and guide ring ensure that the base and sliding column remain connected after the device operates, preventing the product from being thrown out and affecting the safety of the deployment process, thus improving deployment safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic cross-sectional view of the automatic pin-removing device before pin removal provided in this embodiment of the utility model.

[0019] Figure 2 This is a three-dimensional structural diagram of the automatic pin-removing device before pin removal provided in this embodiment of the utility model;

[0020] Figure 3 This is a schematic cross-sectional view of the automatic pin-removing device after pin removal provided in this embodiment of the utility model.

[0021] Figure 4 This is a three-dimensional structural diagram of the automatic pin-removing device after the pin is removed, provided in an embodiment of this utility model.

[0022] Reference numerals: 1-Base; 101-First fixing hole; 102-First connecting wall; 103-U-shaped groove; 104-Mounting base; 2-Sliding column; 201-First column; 202-Second column; 203-Third column; 204-Second connecting wall; 3-Bearing; 4-Pin pull assembly; 401-Pin pull head; 402-Connector; 403-Adjusting component; 5-Guide ring; 6-Fixing component; 7-Spring; 8-Safety screw; 9-Adjusting column; 10-Limiting component. Detailed Implementation

[0023] 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.

[0024] To address the problem of unreliable switching action of limit switches in existing technologies, which leads to unreliable fuse release and tripping, this utility model provides an automatic pin-removing device, such as... Figure 1 , Figure 2 As shown, the device includes: a hollow base 1 with a first fixing hole 101 on its outer wall, the base 1 being used to connect with a laying component; a sliding column 2, one end of which passes through the hollow cavity of the base 1 and connects to one end of an adjusting column 9, the other end of which is located on the outside of the base 1 and is fitted with a bearing 3; the outer side of the sliding column 2 has a stepped surface; the bearing 3 is vertically arranged and used to cooperate with the laying track; the diameter of the adjusting column 9 is smaller than the diameter of the hollow cavity; a pin-pulling assembly 4, one end of which is connected to the other end of the adjusting column 9, the other end of which is used to connect to the pin-pulling terminal; and a guide ring 5, which is located in the hollow cavity of the base 1. Inside the cavity, and sleeved on the outside of the sliding column 2, closer to the pin-pulling assembly 4 than the stepped surface, the outer wall is provided with a second fixing hole, which is corresponding to the first fixing hole 101. When the first fixing hole 101 corresponds to the second fixing hole, the fixing member 6 is used to press the guide ring 5 against the outside of the sliding column 2; the spring 7 is located in the hollow inner cavity of the base 1 and sleeved on the outside of the sliding column 2, with one end abutting against the stepped surface and the other end abutting against the end face of the guide ring 5, in a compressed state; when the bearing 3 disengages from the track, the sliding column 2 pulls the pin-pulling assembly 4 under the thrust of the spring 7 to release the safety of the pin-pulling end.

[0025] Combination Figure 1 and Figure 2 It can be seen that the main body of the base 1 is cylindrical and can be fixedly connected to the laying component. The middle part of the base 1 is axially through to form a hollow inner cavity. The two ends of the base 1 are the mounting end and the pin-pulling end. The outer wall of the base 1 is provided with a first fixing hole 101 near the pin-pulling end.

[0026] like Figure 1 As shown, a portion of the sliding column 2 is located within the hollow cavity of the base 1, while the other portion is located outside the mounting end of the base 1. Specifically, one end of the sliding column 2 penetrates the hollow cavity, while the other end is located outside the base 1. The end penetrating the hollow cavity is also connected to an adjusting column 9. The diameter of the portion of the sliding column 2 located within the hollow cavity is smaller than the diameter of the hollow cavity, satisfying the requirement of free axial movement within the hollow cavity without any limiting. A bearing 3 is connected to the outer end of the sliding column 2 within the base 1, and this bearing 3 can slide on the track.

[0027] like Figure 1 As shown, the portion of the sliding column 2 located within the hollow cavity also has a radially protruding stepped surface, and a guide ring 5 is fitted onto the outer side of this portion. The guide ring 5 is positioned near the pull pin end, while the stepped surface is positioned near the mounting end. The outer wall of the guide ring 5 has a second fixing hole corresponding to the first fixing hole 101. The fixing member 6 can pass through the first fixing hole 101 and connect to the second connecting hole, thereby fixing the relative position of the guide ring 5 and the base 1. It should be noted that the guide ring 5 and the sliding column 2 do not have a limiting relationship.

[0028] Spring 7 is located between guide ring 5 and stepped surface. When the pin is not pulled out, spring 7 is in a compressed state, providing preload for the pin to be pulled out.

[0029] like Figure 1 As shown in Figure 2, one end of the pin-pulling assembly 4 is connected to the adjusting column 9, and the other end is located outside the pin-pulling end of the base 1. This side is used to connect to the pin-pulling terminal.

[0030] In use, the automatic pin-pulling device is installed onto the laying component via the base 1, and the bearing 3 is positioned directly above the track. At this time, the device is in... Figure 1 , Figure 2 In the indicated state, bearing 3 is in close contact with the track under the preload of spring 7. At this time, adjust the connection between the pin-pulling assembly 4 and the adjusting column 9 to ensure a reliable connection between the pin-pulling assembly 4 and the pin-pulling terminal. After releasing the laying component, it slides on the track, and bearing 3 slides accordingly. When the laying component slides off the track, bearing 3 loses its positive pressure, thereby pulling the sliding column 2, adjusting column 9, and pin-pulling assembly 4 a certain distance (e.g., ...). Figure 3 , Figure 4 (As shown in the diagram), thereby releasing the safety pin terminal connected to the pin assembly 4 and reliably powering on the system. During this process, the pulling distance is the distance between the adjusting column 9 and the guide ring 5; that is, if... Figure 3 As shown, when the end face of the adjusting column 9 contacts the end face of the guide ring 5, the pulling stops. At this time, the adjusting column 9 is restricted by the guide ring 5, so the sliding column 2 can no longer move and will not come off the base 1, thus ensuring the safety of the deployment process.

[0031] As an optional implementation, the outer wall of the base 1 near the bearing 3 is provided with an axially arranged U-shaped groove 103; the outer wall of the sliding column 2 is provided with a third fixing hole, and the limiting member 10 passes through the U-shaped groove 103 and is connected in the third fixing hole, with the limiting member 10 protruding from the outer wall of the base.

[0032] like Figure 2 As shown, an axially arranged U-shaped groove 103 is provided on the outer wall of the base 1 near the bearing 3 end (mounting end), and the opening of the U-shaped groove 103 faces outward.

[0033] The sliding column 2 is provided with a third fixing hole on its outer side. The limiting member 10 can be connected in the third fixing hole. During installation, the sliding column 2 is inserted into the hollow inner cavity from the installation end. The limiting member 10 can be inserted from the opening end of the U-shaped groove 103 until it is stuck at the tail end of the U-shaped groove 103, thereby limiting the installation distance between the sliding column 2 and the base 1, and thus ensuring that the spring 7 can be compressed into place.

[0034] After removing the pin, as Figure 4 As shown, the limiting member 10 can move a certain distance along the direction of the U-shaped groove 103.

[0035] As an optional implementation, the limiting member 10 is a screw, and the limiting member 10 is threadedly connected to the third fixing hole; or, the limiting member 10 is a pin, and the limiting member 10 is inserted into the third fixing hole.

[0036] When the limiting member 10 is a screw, it can be threadedly connected to the sliding column 2. When the limiting member 10 is a pin, it can be directly inserted into the third fixing hole. Regardless of the method, the top of the limiting member 10 after installation must protrude from the outer wall of the cylinder of the base 1.

[0037] As an optional implementation, the adjusting column 9 is axially continuous and has internal threads; when the safety is not released, part of the adjusting column 9 is located in the hollow inner cavity and the other part is located on the outside of the base 1; the pin assembly 4 passes through one end of the adjusting column 9 and is threadedly connected to the adjusting column 9; the sliding column 2 passes through the other end of the adjusting column 9 and is threadedly connected to the adjusting column 9.

[0038] like Figure 1 As shown, the adjusting column 9 is axially continuous and has internal threads, as... Figure 1 As shown, in the unpinned state, part of the adjusting column 9 is located inside the base 1, and the other part is located on the inner side of the base 1. The sliding column 2 passes through one end of the adjusting column 9 and is threaded to it, while the pin-pulling assembly 4 passes through the other end of the adjusting column 9 and is threaded to it. The installation length of the pin-pulling assembly 4 can be adjusted by rotating it. This ensures that after the device is released from its safety mechanism, the pin-pulling assembly 4 is reliably connected to the safety terminal of the deployment component without being subjected to additional pulling or inserting force.

[0039] As an optional implementation, the pin-pulling assembly 4 includes: an adjusting member 403, a connecting member 402, and a pin-pulling head 401; one end of the adjusting member 403 is threadedly connected to the adjusting post 9, and the other end is connected to the pin-pulling head 401 through the connecting member 402.

[0040] like Figure 1 As shown, the pin-pulling assembly 4 includes an adjusting member 403, a connecting member 402, and a pin-pulling head 401. One end of the adjusting member 403 is threadedly connected to the adjusting post 9, and the other end is connected to the pin-pulling head 401 via the connecting member 402. The pin-pulling head 401 is used to connect to the safety terminal.

[0041] As an alternative implementation, connector 402 is a fastening screw.

[0042] As an optional implementation, the pin puller 401 includes an integrally formed base, a first positioning piece, and a second positioning piece; the base is connected to the adjusting piece 403 via a connector 402; the first positioning piece and the second positioning piece protrude from the base and are arranged in parallel; threaded holes are provided at opposite positions on the first positioning piece and the second positioning piece.

[0043] like Figure 2 , Figure 4 As shown, the base, first positioning piece and second positioning piece of the pin puller 401 are integrally formed. The base is connected to the adjusting piece 403 through the connector 402. The first positioning piece and the second positioning piece are arranged in parallel on the base. Both of them have threaded holes for threaded connection with the safety terminal.

[0044] As an optional implementation, a first connecting wall 102 is provided radially on the outer wall of the base 1; a second connecting wall 204 is provided radially on the outer wall of the sliding column 2 located outside the base 1; the first connecting wall 102 and the second connecting wall 204 are provided correspondingly, and the safety screw 8 passes through the first connecting wall 102 and the second connecting wall 204 to connect the base 1 and the sliding seat, so as to ensure the compressed state of the spring 7 before the safety is released.

[0045] like Figure 2 As shown, a first connecting wall 102 is radially arranged on the outer wall of the base 1, and a second connecting wall 204 extends from the outer wall of the portion of the sliding column 2 located outside the base 1. The first connecting wall 102 and the second connecting wall 204 are correspondingly arranged, and their corresponding positions can be restricted by the limiting member 10. When the safety device is not released, i.e., when the limiting member 10 is stuck at the tail of the U-shaped groove 103, the first connecting wall 102 and the second connecting wall 204 are connected by the safety screw 8, thereby restricting the relative position of the sliding column 2 and the base 1 and ensuring that the entire device will not move accidentally during transportation and handling. Before deployment, the safety screw 8 should be unscrewed first before proceeding with the subsequent operation steps.

[0046] As an optional implementation, the outer wall of the substrate 1 is provided with four first fixing holes 101 evenly distributed in the circumferential direction; the guide ring 5 is provided with four second fixing holes corresponding to the four first fixing holes 101.

[0047] The sliding post 2 will be installed into the base 1 from the mounting end. When the second fixing hole of the guide ring 5 on the outer side of the sliding post 2 moves to the corresponding position of the first fixing hole 101, the relative position of the guide ring 5 and the base 1 is fixed by the limiting member 10.

[0048] As an optional implementation, the outer wall of the base 1 is provided with a mounting base 104, which is located on the side of the track; the bottom of the mounting base 104 is provided with a U-shaped hole for the track to pass through.

[0049] like Figure 2 As shown, the outer wall of the base 1 is provided with a mounting base 104. The mounting base 104 has screw holes for connecting with the laying parts, and the bottom of the mounting base 104 has a U-shaped hole for allowing some parts to pass through.

[0050] As an optional implementation, the sliding column 2 includes a first column 201, a second column 202, and a third column 203 with successively decreasing diameters; a stepped surface is formed at the junction of the first column 201 and the second column 202; the second column 202 is disposed in a hollow inner cavity, and a spring 7 and a guide ring 5 are sleeved on its outer side; the third column 203 is disposed at the tail of the second column 202 and is connected to the adjusting column 9.

[0051] like Figure 3 As shown, the sliding column 2 comprises three columns, the diameter of which gradually decreases from right to left. Specifically, the diameter of the first column 201 is larger than that of the second column 202, and the diameter of the second column 202 is larger than that of the third column 203. The interface between the first column 201 and the second column 202 is a stepped surface. A spring 7 and a guide ring 5 are fitted onto the outer side of the second column 202. The third column 203 passes through the adjusting column 9 and is threadedly connected to it.

[0052] The assembly process in this embodiment is as follows:

[0053] First, install the bearing at one end of the sliding column and install the limit screw in the radial direction of the sliding column. Then, put the spring and guide ring onto the outside of the sliding column in sequence. Install the adjusting column at the other end of the sliding column and install the pin assembly on the adjusting column. Insert the connected assembly into the base so that the limit member enters the U-shaped groove. When the second fixing hole of the guide ring corresponds to the first fixing hole of the base, connect the two through the fixing member. Then, connect the base and the sliding seat through the safety screw.

[0054] The above technical solution has the following beneficial effects: The device has a compact structure and good versatility. The mechanical pin-pulling method ensures high reliability of operation and is suitable for automatic pin-pulling off-rail in rail-based, especially long-rail, deployment conditions. The bearing contacts the deployment track, reducing the friction between the device and the track and minimizing vibration and noise during deployment. The use of a threaded adjustable live joint mechanism ensures that after the device releases the safety screw, the pin-pulling head and the product safety terminal are reliably connected without being subjected to additional pulling force, ensuring that the product is not accidentally disarmed while on the track. The installed fixing parts and guide ring ensure that the base and sliding column remain connected after the device operates, preventing the product from being thrown out and affecting the safety of the deployment process, thus improving deployment safety.

[0055] The above-described specific embodiments of the utility model further illustrate the purpose, technical solution, and beneficial effects of the utility model. It should be understood that the above content is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the utility model should be included within the scope of protection of the utility model.

Claims

1. An automatic pin-removing device, characterized in that, include: A hollow substrate with a first fixing hole on its outer wall, the substrate being used to connect with a laying component; A sliding column, one end of which passes through the hollow inner cavity of the base and is connected to one end of an adjusting column, and the other end is located on the outside of the base and is equipped with a bearing; the outer side of the sliding column is provided with a stepped surface; the bearing is vertically arranged for cooperation with the laying track; the diameter of the adjusting column is smaller than the diameter of the hollow inner cavity; A pin-pulling assembly, one end of which is connected to the other end of the adjusting column, and the other end is used to connect to the pin-pulling terminal; A guide ring is disposed in the hollow inner cavity of the base and sleeved on the outside of the sliding column, closer to the pin puller assembly than the stepped surface. The outer wall is provided with a second fixing hole, which is corresponding to the first fixing hole. When the first fixing hole corresponds to the second fixing hole, a fixing member is used to press the guide ring against the outside of the sliding column. The spring is located in the hollow cavity of the base and is sleeved on the outside of the sliding column. One end of the spring abuts against the stepped surface, and the other end abuts against the end face of the guide ring, and is in a compressed state. When the bearing disengages from the track, the sliding column pulls the pin assembly under the action of the spring to release the safety of the pin end.

2. The automatic pin-removing device according to claim 1, characterized in that: The outer wall of the substrate near the bearing end is provided with an axially arranged U-shaped groove; The outer wall of the sliding column is provided with a third fixing hole, and the limiting member passes through the U-shaped groove and is connected in the third fixing hole. The limiting member protrudes from the outer wall of the base.

3. The automatic pin-removing device according to claim 2, characterized in that: The limiting member is a screw, and the limiting member is threadedly connected to the third fixing hole; Alternatively, the limiting member is a pin, which is inserted into the third fixing hole.

4. The automatic pin-removing device according to claim 1, characterized in that: The adjusting column is axially continuous and has internal threads; when the safety is not released, part of the adjusting column is located in the hollow inner cavity and the other part is located on the outside of the base. The pin assembly passes through one end of the adjusting column and is threadedly connected to the adjusting column. The sliding column passes through the other end of the adjusting column and is threadedly connected to the adjusting column.

5. The automatic pin-removing device according to claim 4, characterized in that, The pull-out pin assembly includes: Adjusting parts, connecting parts, and pin pullers; One end of the adjusting member is threadedly connected to the adjusting column, and the other end is connected to a pull pin head via a connector.

6. The automatic pin-removing device according to claim 5, characterized in that: The pin puller includes an integrally formed base, a first positioning piece, and a second positioning piece; The base is connected to the adjusting member via a connector; The first positioning piece and the second positioning piece protrude from the base and are arranged in parallel. Both the first positioning piece and the second positioning piece have threaded holes at their relative positions.

7. The automatic pin-removing device according to claim 1, characterized in that: The outer wall of the matrix is ​​provided with a first connecting wall in the radial direction; The sliding column is located on the outer wall of the base with a second connecting wall arranged radially. The first connecting wall and the second connecting wall are respectively arranged, and the safety screw passes through the first connecting wall and the second connecting wall to connect the base and the sliding seat, so as to ensure the spring is in a compressed state before the safety is released.

8. The automatic pin-removing device according to claim 1, characterized in that: The outer wall of the substrate has four first fixing holes evenly distributed circumferentially. The guide ring is provided with four second fixing holes corresponding to the four first fixing holes.

9. The automatic pin-removing device according to claim 1, characterized in that: The outer wall of the base is provided with a mounting seat, which is located on the side of the track. The mounting base has a U-shaped hole at the bottom to allow the track to pass through.

10. The automatic pin-removing device according to claim 1, characterized in that: The sliding column includes a first column, a second column, and a third column with successively decreasing diameters; The stepped surface is formed at the junction of the first column and the second column; The second column is disposed in the hollow inner cavity, and a spring and a guide ring are sleeved on the outer side; The third column is located at the tail of the second column and is connected to the adjusting column.

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