Automatic pin pulling device

Abstract

The embodiment of the invention discloses an automatic pin pulling device which comprises a hollow base body, and a first fixing hole is formed in the outer wall of the base body; 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] The invention relates to the field of track laying, and in particular to an automatic pin pulling device. Background Art

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

[0003] The release device in the prior art is usually a limit switch. When the product is on the track, the limit switch is in the off state. After derailment, the limit switch is in the on state, and the fire circuit is connected. However, in the friction and vibration environment when the product is placed on the long track, the travel switch has the disadvantages of insufficient preload and unstable action stroke, which makes the switch action unreliable, resulting in unreliable insurance and release.

[0004] There is no effective solution to the above problems in the prior art. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an automatic pin pulling device, which is provided with a mechanical pin pulling mechanism so that the pin pulling is automatically completed when the device is off the track, thereby solving the problem of unreliable safety and release actions.

[0006] To achieve the above objectives, the present invention provides an automatic pin pulling device, comprising: a base body, the base body is hollow, and a first fixing hole is provided on the outer wall, the base body is used to connect with a deployment member; a sliding column, one end of the sliding column penetrates into the hollow inner cavity of the base body and is connected with one end of an adjusting column, and the other end is arranged on the outside of the base body and is installed with a bearing; a step surface is provided on the outer side of the sliding column; the bearing is vertically arranged to cooperate with a deployment track; the diameter of the adjusting column is smaller than the diameter of the hollow inner cavity; a pin pulling assembly, one end of the pin pulling assembly is connected with the other end of the adjusting column, and the other end is used to connect with a pin pulling terminal; a guide ring, the guide ring is provided The spring is in the hollow inner cavity of the base body and is sleeved on the outer side of the sliding column, closer to the pin pulling assembly than the step surface, and a second fixing hole is provided on the outer wall, and the second fixing hole is arranged corresponding to the first fixing hole. When the first fixing hole corresponds to the second fixing hole, a fixing piece is used to tighten the guide ring against the outer side of the sliding column; a spring, the spring is arranged in the hollow inner cavity of the base body and is sleeved on the outer side of the sliding column, one end of the spring is against the step surface, and the other end is against the end face of the guide ring, and is in a compressed state; when the bearing is out of the track, the sliding column pulls the pin pulling assembly under the thrust of the spring to release the safety of the pin pulling terminal.

[0007] Further optionally, an axially arranged U-shaped groove is provided on the outer wall of one end of the base close to the bearing; a third fixing hole is provided on the outer wall of the sliding column, a limiting member passes through the U-shaped groove and is connected in the third fixing hole, and the limiting member protrudes from the outer wall of the base.

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

[0009] Further optionally, the adjusting column is axially through and has a thread inside; when the safety state is not released, a part of the adjusting column is located in the hollow inner cavity, and the other part is arranged on the outside of the base; the pin pulling assembly penetrates from one end of the adjusting column and is threadedly connected to the adjusting column; the sliding column penetrates from 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 via the connecting member.

[0011] Further optionally, the pin pulling head includes an integrally formed base, a first positioning piece and a second positioning piece; the base is connected to the adjusting piece via a connecting piece; the first positioning piece and the second positioning piece protrude from the base and are arranged in parallel; threaded holes are provided at relative positions of the first positioning piece and the second positioning piece.

[0012] Further optionally, a first connecting wall is radially arranged on the outer wall of the base; a second connecting wall is radially arranged on the outer wall of the sliding column located outside the base; the first connecting wall and the second connecting wall are arranged 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 compression state of the spring before the safety is released.

[0013] Further optionally, the outer wall of the base body is provided with four first fixing holes evenly distributed along the circumferential direction; and the guide ring is provided with four second fixing holes corresponding to the four first fixing holes.

[0014] Further optionally, a mounting seat is provided on the outer wall of the base, and the mounting seat is located on the track side; a U-shaped hole is provided at the bottom of the mounting seat for accommodating the track to pass through.

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

[0016] The above technical scheme has the following beneficial effects: the device has a compact structure and good versatility, and the mechanical pin pulling method makes the operation highly reliable, and is suitable for automatic pin pulling during off-track laying conditions, especially long tracks; the bearing is in contact with the laying track, which reduces the friction between the device and the track and reduces the vibration and noise during the laying process; the thread-adjustable live joint mechanism ensures that after the device releases the safety screw, the pin pulling head and the product safety terminal are both reliably connected and not subject to additional plug-in and pull-out forces, ensuring that the product is not accidentally released when on the track; the installed fixings and guide rings ensure that the base and the sliding column are still connected after the device is actuated, and the product will not be thrown out to affect the safety of the laying process, thereby improving the laying safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic cross-sectional structure diagram of the automatic pin pulling device provided by an embodiment of the present invention before pin pulling;

[0019] Figure 2 is a schematic diagram of the three-dimensional structure of the automatic pin pulling device provided by an embodiment of the present invention before pin pulling;

[0020] Figure 3 is a schematic cross-sectional structure diagram of the automatic pin pulling device provided by an embodiment of the present invention after the pin is pulled out;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the automatic pin pulling device provided by an embodiment of the present invention after the pin is pulled out.

[0022] Figure markings: 1-base; 101-first fixing hole; 102-first connecting wall; 103-U-shaped groove; 104-mounting seat; 2-sliding column; 201-first column; 202-second column; 203-third column; 204-second connecting wall; 3-bearing; 4-pin pulling assembly; 401-pin pulling head; 402-connecting piece; 403-adjusting piece; 5-guide ring; 6-fixing piece; 7-spring; 8-safety screw; 9-adjusting column; 10-limiting piece. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In order to solve the problem that the switch action of the travel switch in the prior art is unreliable, resulting in unreliable insurance and release, the embodiment of the present invention provides an automatic pin removal device, such as Figure 1 , Figure 2 As shown, the device comprises: a base 1, which is hollow and has a first fixing hole 101 on its outer wall, and is used to connect with a deployment member; a sliding column 2, one end of which penetrates into the hollow inner cavity of the base 1 and is connected with one end of an adjusting column 9, and the other end is arranged on the outside of the base 1 and is installed with a bearing 3; a step surface is arranged on the outer side of the sliding column 2; the bearing 3 is arranged vertically and is used to cooperate with the deployment track; the diameter of the adjusting column 9 is smaller than the diameter of the hollow inner cavity; a pin pulling assembly 4, one end of which is connected with the other end of the adjusting column 9, and the other end is used to connect with a pin pulling terminal; a guide ring 5, which is arranged in the hollow inner cavity of the base 1 The guide ring 5 is pressed against the outer side of the sliding column 2 by the fixing member 6; the spring 7 is arranged in the hollow inner cavity of the base 1 and is sleeved on the outer side of the sliding column 2, with one end against the step surface and the other end against the end face of the guide ring 5 in a compressed state; when the bearing 3 is out of track, the sliding column 2 pulls the pin pulling assembly 4 under the thrust of the spring 7 to release the insurance of the pin pulling terminal.

[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 deployment piece. The middle part of the base 1 is axially penetrated to form a hollow inner cavity. The two ends of the base 1 are the installation end and the pin removal end. The outer wall of the base 1 is provided with a first fixing hole 101 near the pin removal end.

[0026] like Figure 1 As shown, a part of the sliding column 2 is located in the hollow inner cavity of the base 1, and the other part is located outside the mounting end of the base 1, that is, one end of the sliding column 2 penetrates into the hollow inner cavity, and the other end is arranged outside the base 1, and the end penetrating into the hollow inner cavity is also connected to the adjustment column 9. The diameter of the part of the sliding column 2 located in the hollow inner cavity is smaller than the diameter of the hollow inner cavity, which meets the requirement of free axial movement in the hollow inner cavity without limitation. The end of the sliding column 2 located outside the base 1 is connected to a bearing 3, which can slide on the track.

[0027] like Figure 1 As shown, the portion of the sliding column 2 located in the hollow inner cavity is also provided with a radially protruding step surface, and a guide ring 5 is also sleeved on the outer side of the portion, the guide ring 5 is close to the pin removal end, and the step surface is close to the installation end. The outer wall of the guide ring 5 is provided with a second fixing hole corresponding to the first fixing hole 101, and the fixing member 6 can pass through the first fixing hole 101 and connect with the second connecting hole, thereby fixing the relative position of the guide ring 5 and the base 1. It should be noted that there is no limiting relationship between the guide ring 5 and the sliding column 2.

[0028] The spring 7 is arranged between the guide ring 5 and the step surface. When the pin is not pulled out, the spring 7 is in a compressed state, providing a pre-tightening force for pulling out the pin.

[0029] like Figure 1 As shown in FIG. 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 , which is used to connect to the pin pulling terminal.

[0030] When in use, the automatic pin removal device is installed on the laying piece through the base 1, and the bearing 3 is placed directly above the track. Figure 1 , Figure 2 In the state shown, the bearing 3 is in close contact with the track under the action of the preload force of the spring 7. At this time, the connection relationship between the pin puller assembly 4 and the adjusting column 9 is adjusted to ensure that the pin puller assembly 4 is reliably connected to the pin puller terminal. After the deployment piece is released, the deployment piece slides on the track, and the bearing 3 slides on the track accordingly. When the deployment piece slides out of the track, the bearing 3 loses the positive pressure, thereby driving the sliding column 2, the adjusting column 9 and the pin puller assembly 4 to be pulled out a certain distance (such as Figure 3 , Figure 4 The pulling distance is the distance between the adjusting column 9 and the guide ring 5. In other words, Figure 3 As shown, when the end face of the adjusting column 9 contacts the end face of the guide ring 5, the pulling is stopped. At this time, the adjusting column 9 is restricted by the guide ring 5, and the sliding column 2 can no longer move and will not fall out of the base 1, thereby ensuring the safety of the deployment process.

[0031] As an optional embodiment, an axially arranged U-shaped groove 103 is provided on the outer wall of one end of the base 1 close to the bearing 3; a third fixing hole is provided on the outer wall of the sliding column 2, and the limit member 10 passes through the U-shaped groove 103 and is connected to the third fixing hole, and the limit member 10 protrudes from the outer wall of the base.

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

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

[0034] After unpinning, 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 stopper 10 is a screw, it can be threadedly connected with the sliding column 2. When the stopper 10 is a pin, it can be directly inserted into the third fixing hole. In either case, the top of the stopper 10 after installation needs to protrude from the outer wall of the cylinder of the base 1.

[0037] As an optional embodiment, the adjusting column 9 is axially through and has a thread inside; when the safety state is not released, a part of the adjusting column 9 is located in the hollow inner cavity, and the other part is arranged on the outside of the base 1; the pin pulling assembly 4 is inserted from one end of the adjusting column 9 and is threadedly connected to the adjusting column 9; the sliding column 2 is inserted from 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 through and has threads inside. Figure 1 As shown, in the unpinned state, a part of the adjustment column 9 is located inside the base 1, and the other part is arranged inside the base 1. The sliding column 2 is inserted from one end of the adjustment column 9 and is threadedly connected thereto, and the pin pulling assembly 4 is inserted from the other end of the adjustment column 9 and is threadedly connected thereto, and the installation length of the pin pulling assembly 4 can be adjusted by rotating the pin pulling assembly 4. This ensures that after the device is released from the safety, the pin pulling assembly 4 is reliably connected to the safety terminal of the deployment piece and is not subject to additional plug-in and pull-out 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 column 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 column 9, and the other end is connected to the pin pulling head 401 through the connecting member 402. The pin pulling head 401 is used to connect to the insurance terminal.

[0041] As an optional implementation, the connecting member 402 is a fastening screw.

[0042] As an optional embodiment, the pin pulling head 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 connecting piece 402; the first positioning piece and the second positioning piece protrude from the base and are arranged in parallel; threaded holes are provided at relative positions of the first positioning piece and the second positioning piece.

[0043] like Figure 2 , Figure 4 As shown, the base, the first positioning piece and the second positioning piece of the pin puller 401 are integrally formed, the base is connected to the adjusting piece 403 via a connecting piece 402, the first positioning piece and the second positioning piece are arranged in parallel on the base, and both are provided with threaded holes for threaded connection with the insurance terminal.

[0044] As an optional embodiment, a first connecting wall 102 is radially arranged on the outer wall of the base 1; a second connecting wall 204 is radially arranged 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 arranged 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 compression state of the spring 7 before the safety is released.

[0045] like Figure 2 As shown, the outer wall of the base 1 is provided with a first connecting wall 102 in the radial direction, and the outer wall of the sliding column 2 located at the outer part of the base 1 is also extended with a second connecting wall 204. The first connecting wall 102 and the second connecting wall 204 are provided correspondingly, and the corresponding positions of the two can be limited by the limiter 10. In the unreleased safety state, that is, when the limiter 10 is stuck in the tail state 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 limiting the relative position of the sliding column 2 and the base 1, ensuring that the device as a whole will not malfunction during transportation and placement. Before placement, first unscrew the safety screw 8 before proceeding with the subsequent operation steps.

[0046] As an optional implementation, the outer wall of the base body 1 is uniformly provided with four first fixing holes 101 along the circumferential direction; and the guide ring 5 is provided with four second fixing holes corresponding to the four first fixing holes 101 .

[0047] The sliding column 2 is installed into the base 1 from the mounting end. When the second fixing hole of the guide ring 5 outside the sliding column 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 stopper 10 .

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

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

[0050] As an optional embodiment, the sliding column 2 includes a first column 201, a second column 202 and a third column 203 whose diameters decrease successively; a step surface is formed at the junction of the first column 201 and the second column 202; the second column 202 is arranged in the hollow inner cavity, and a spring 7 and a guide ring 5 are arranged on the outside; the third column 203 is arranged 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 includes three columns, and the diameters of the three columns gradually decrease from right to left, that is, the diameter of the first column 201 is larger than the diameter of the second column 202, and the diameter of the second column 202 is larger than the diameter of the third column 203. Among them, the interface between the first column 201 and the second column 202 is a step surface, the outer side of the second column 202 is sleeved with a spring 7 and a guide ring 5, and the third column 203 penetrates the adjustment column 9 and is threadedly connected thereto.

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

[0053] First, install the bearing to one end of the sliding column, and install the limit screw to the radial direction of the sliding column, put the spring and the guide ring on the outside of the sliding column in sequence, install the adjusting column at the other end of the sliding column, and install the pull-pin assembly on the adjusting column, insert the connected components into the base, and make the limit piece enter 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 piece, and then connect the base to the sliding seat through the safety screw.

[0054] The above technical scheme has the following beneficial effects: the device has a compact structure and good versatility, and the mechanical pin pulling method makes the operation highly reliable, and is suitable for automatic pin pulling during off-track laying conditions, especially long tracks; the bearing is in contact with the laying track, which reduces the friction between the device and the track and reduces the vibration and noise during the laying process; the thread-adjustable live joint mechanism ensures that after the device releases the safety screw, the pin pulling head and the product safety terminal are both reliably connected and not subject to additional plug-in and pull-out forces, ensuring that the product is not accidentally released when on the track; the installed fixings and guide rings ensure that the base and the sliding column are still connected after the device is actuated, and the product will not be thrown out to affect the safety of the laying process, thereby improving the laying safety.

[0055] The specific implementation methods of the above invention further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above content is only the specific implementation methods of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic pin removal device, characterized in that: include: A base body, wherein the base body is hollow and has a first fixing hole on its outer wall, and the base body is used to be connected to the deployment piece; A sliding column, one end of which penetrates into the hollow inner cavity of the base body and is connected to one end of the adjusting column, and the other end is arranged outside the base body and is installed with a bearing; a step surface is arranged on the outer side of the sliding column; the bearing is arranged vertically and is used to cooperate 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 a pin pulling terminal; A guide ring, the guide ring is arranged in the hollow inner cavity of the base body, and is sleeved on the outer side of the sliding column, closer to the pin pulling assembly than the step surface, and has a second fixing hole on the outer wall, the second fixing hole is arranged corresponding to the first fixing hole, and when the first fixing hole corresponds to the second fixing hole, a fixing member is used to tighten the guide ring against the outer side of the sliding column; A spring is arranged in the hollow inner cavity of the base body and is sleeved on the outer side of the sliding column, with one end abutting against the step surface and the other end abutting against the end surface of the guide ring, in a compressed state; when the bearing is out of the track, the sliding column pulls the pin pulling assembly under the thrust of the spring to release the safety of the pin pulling terminal.

2. The automatic pin removal device according to claim 1, characterized in that: An axially arranged U-shaped groove is provided on the outer wall of one end of the base body close to the bearing; A third fixing hole is formed on the outer wall of the sliding column, and a 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 removal 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, and the limiting member is inserted into the third fixing hole.

4. The automatic pin removal device according to claim 1, characterized in that: The adjusting column is axially through and has a thread inside; when the safety state is not released, a part of the adjusting column is located in the hollow inner cavity, and the other part is located outside the base body; The pin pulling assembly penetrates from one end of the adjusting column and is threadedly connected to the adjusting column; The sliding post is inserted from the other end of the adjusting post and is threadedly connected with the adjusting post.

5. The automatic pin removal device according to claim 4, characterized in that: The pin pulling assembly comprises: 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 pin pulling head through a connecting member.

6. The automatic pin removal device according to claim 6, characterized in that: The pin pulling head comprises an integrally formed base, a first positioning piece and a second positioning piece; The base is connected to the adjusting member via a connecting member; 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 of the first positioning piece and the second positioning piece.

7. The automatic pin removal device according to claim 1, characterized in that: 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 outside the base body is radially provided with a second connecting wall; The first connecting wall and the second connecting wall are arranged correspondingly, and the safety screw passes through the first connecting wall and the second connecting wall to connect the base body and the sliding seat, so as to ensure the compression state of the spring before the safety is released.

8. The automatic pin removal device according to claim 1, characterized in that: The outer wall of the base body is evenly distributed along the circumferential direction with four first fixing holes; The guide ring is provided with four second fixing holes corresponding to the four first fixing holes.

9. The automatic pin removal device according to claim 1, characterized in that: The outer wall of the base body is provided with a mounting seat, and the mounting seat is located on the track side; A U-shaped hole is provided at the bottom of the mounting seat for allowing the track to pass through.

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

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