Quick installation trapezoidal subway bolt

Abstract

The present application relates to the technical field of anti-loose bolt, and particularly relates to a quick installation type trapezoidal subway bolt, which comprises a mounting plate arranged on a subway vehicle or a subway track, an anti-loose bolt and a nut part; the present application can solve the following problems existing in the anti-loose bolt in the prior art during use: the coil spring is prone to small-amplitude vibration under the action of vibration, thereby causing loosening between the coil spring and the threads on the outer wall of the anti-loose bolt, so that the stability of the anti-loose bolt cannot be effectively ensured, and the anti-loose bolt is prone to loosening from the nut; the anti-loose bolt cannot be effectively fixed by relying on the friction between the protruding needle and the outer wall of the anti-loose bolt, and the anti-loose bolt can still rotate and loosen from the nut under the action of external force, thereby affecting the clamping effect of the anti-loose bolt; the anti-loose bolt has the risk of loosening at any time, thereby existing a safety hazard.

Description

Technical Field

[0001] This invention relates to the technical field of anti-loosening bolts, and particularly to a quick-installation trapezoidal subway bolt. Background Technology

[0002] A bolt is a type of fastener consisting of a head and a threaded shaft. It is used in conjunction with a nut and is mainly used to fasten two parts with through holes. The threads on the outer wall of a bolt are usually classified according to the cross-sectional shape of the threads, such as triangular threads, rectangular threads, and trapezoidal threads. Bolts are mainly used in industries such as electronic products, mechanical products, power equipment, aircraft, trams, and subways. In particular, due to the characteristics of bolts being quick to install and disassemble, bolts are also used as fasteners between components of subway vehicles and subway track components.

[0003] Furthermore, because subways operate at high speeds for extended periods, and the friction between subway vehicles and the tracks during operation generates vibrations, bolts on the subway are prone to loosening under these vibrations. Loose bolts can no longer provide a tightening function, which can easily lead to accidents.

[0004] With the development of technology, technicians in related fields have also made a lot of optimizations to bolts to solve the problem of bolts being easy to loosen. In order to make a more accurate comparison, Chinese patent with publication number CN106662139A discloses a bolt and an anti-loosening bolt combined with a spring, which is mainly composed of a screw part and a head. The screw part includes a first component, a second component, a coil spring and a fixing part.

[0005] During use, when the anti-loosening bolt engages with the coupling hole of the nut or structure, the protruding pin aligns with the spiral groove of the second component, and the friction between the protruding pin at the front end of the coil spring and the anti-loosening bolt can lock the anti-loosening bolt, thereby preventing it from being loosened. When it is necessary to remove the anti-loosening bolt, the elastic fixing part is disengaged from the spring receiving groove by the ring. If the coil spring rotates in the opposite direction to the thread on the outer wall of the anti-loosening bolt, the coil spring will disengage from the anti-loosening bolt.

[0006] However, the aforementioned anti-loosening bolts still have some shortcomings in actual use:

[0007] 1. Because the coil spring is elastic, when the anti-loosening bolt is under vibration, the coil spring is prone to small-amplitude vibration, which can cause the threads between the coil spring and the outer wall of the anti-loosening bolt to loosen. This makes it impossible to effectively ensure the stability of the anti-loosening bolt and can easily cause the anti-loosening bolt and nut to loosen.

[0008] 2. In addition, relying solely on the friction between the protruding pin and the outer wall of the anti-loosening bolt is insufficient to effectively fix the anti-loosening bolt. The anti-loosening bolt can still rotate under external force and loosen from the nut, thus affecting the locking effect of the anti-loosening bolt. When the anti-loosening bolt is used in industrial production or vehicles, there is a risk that the anti-loosening bolt may loosen at any time, thus posing a safety hazard.

[0009] Therefore, based on the above-stated viewpoints, there is still room for improvement in existing bolt anti-loosening methods. Summary of the Invention

[0010] To address the aforementioned problems, this invention provides a quick-installation trapezoidal subway bolt, comprising an mounting plate installed on a subway vehicle or subway track, an anti-loosening bolt rotatably connected to the mounting plate, the outer wall of the anti-loosening bolt being threaded, and a nut portion being fitted onto the outer wall of the anti-loosening bolt via a threaded connection.

[0011] The nut part includes a first annular cylinder rotatably connected to the outer wall of the anti-loosening bolt. A second annular cylinder is installed on the side of the first annular cylinder away from the head of the anti-loosening bolt via multiple annularly distributed telescopic rods. A fastening mechanism is provided between the first annular cylinder and the second annular cylinder. The fastening mechanism includes a screw frame installed on the inner wall of the first annular cylinder via an annular plate and engaged with the thread. A limit mechanism is provided on the second annular cylinder. The limit mechanism includes a snap-fit ​​block disposed inside the second annular cylinder.

[0012] Preferably, the fastening mechanism further includes positioning blocks. Multiple positioning blocks are evenly arranged on the inner sidewall of the second annular cylinder. The multiple positioning blocks are arranged in a spiral, and the pitch of the spiral structure formed by the multiple positioning blocks is equal to the pitch of the thread. Multiple ring-shaped support springs are evenly arranged between the second annular cylinder and the first annular cylinder. The support springs and the telescopic rod are arranged alternately.

[0013] The inner wall of the first annular cylinder is provided with a sliding groove, and the annular plate is slidably connected in the sliding groove. A plurality of annularly distributed pull ropes are evenly arranged on the side of the annular plate away from the second annular cylinder. The end of the pull rope away from the annular plate passes through the first annular cylinder and is connected to the second annular cylinder.

[0014] Preferably, the fastening mechanism further includes a pusher cylinder, and the pusher cylinder is fitted on the outer wall of the anti-loosening bolt by means of a threaded connection. The width of the pusher cylinder is greater than the thread pitch. Multiple annularly distributed balls are evenly rotatably connected on the side of the pusher cylinder away from the head of the anti-loosening bolt. The pusher cylinder is also provided with an anti-slip component inside.

[0015] Preferably, the anti-slip component includes a top extension spring rod, and two mounting slots are symmetrically opened inside the push cylinder along its width direction. The top extension spring rod is installed inside the mounting slot. An anti-slip pad is hinged to the end of the top extension spring rod away from the mounting slot through a linkage plate. The anti-slip pad slides against the threaded side wall.

[0016] Preferably, the inner diameter of the annular plate is greater than the thread height, so that the inner sidewall of the annular plate does not contact the thread, the distance between the inner sidewall of the screw frame and the outer sidewall of the anti-loosening bolt is less than the thread height, and the screw frame does not contact the outer wall of the anti-loosening bolt, the outer diameter of the push cylinder is smaller than the inner diameter of the annular plate, and the ball bearings at the end of the push cylinder are in rolling contact with the screw frame.

[0017] Preferably, the outer wall of the push cylinder has two through holes with connecting mounting slots, and the outer wall of the anti-slip pad is equipped with a control pin. The control pin extends to the outside after passing through the through hole. The outer wall of the control pin is flush with the outer wall of the push cylinder, and the outer wall of the control pin is provided with a corrugated groove to increase friction.

[0018] Preferably, the limiting mechanism further includes a pushing rod. The second annular cylinder has a plurality of annularly distributed limiting grooves evenly distributed inside. A receiving groove is provided on the side of the limiting groove near the axis of the second annular cylinder. The pushing rod is slidably connected inside the limiting groove. An annular frame is sleeved on the outer wall of the pushing rod. A plurality of annularly distributed contraction springs are evenly arranged between the annular frame and the inner wall of the limiting groove. A locking block is installed at the end of the pushing rod near the axis of the second annular cylinder and is slidably connected inside the receiving groove. The side of the pushing rod away from the locking block is an elastic telescopic structure. A plurality of limiting grooves corresponding to the position of the locking block are evenly distributed on the outer wall of the anti-loosening bolt. The second annular cylinder is also provided with an auxiliary component for controlling the locking block to abut against the limiting groove.

[0019] Two baffles are symmetrically hinged along the length of the storage slot on the side near the axis of the second annular cylinder by a torsion spring. The baffles are flush with the inner wall of the second annular cylinder.

[0020] Preferably, the auxiliary component includes multiple annularly distributed push-pull grooves formed inside the second annular cylinder. The push-pull grooves are connected to the limiting slide grooves. One end of the push rod away from the axis of the second annular cylinder extends into the push-pull groove. A top contact rod is installed on the side of the second annular cylinder close to the first annular cylinder. After the end of the top contact rod away from the first annular cylinder extends into the push-pull groove, a vertical plate is installed. A support plate is provided on the side of the vertical plate away from the top contact rod. A wedge block is provided on the side of the support plate close to the axis of the second annular cylinder. The side of the wedge block away from the top contact rod is a contact surface that gradually slopes away from the axis of the second annular cylinder. The contact surface slides against the end of the push rod.

[0021] Preferably, the top contact rod consists of a positioning cylinder, an actuator rod, and a return spring. The positioning cylinder is installed on the side of the vertical plate away from the support plate. The actuator rod is movably connected inside the positioning cylinder. A return spring is rotatably connected between the end of the actuator rod and the bottom wall of the positioning cylinder. Two guide grooves are symmetrically opened on the inner wall of the positioning cylinder along the actuator rod. Two fixing blocks are symmetrically arranged on the outer wall of the actuator rod.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] I. In the process of screwing the first and second annular cylinders into the outer wall of the anti-loosening bolt, the present invention applies a pushing force to the screw frame by pushing the ball bearings at the end of the cylinder, causing the screw frame and the annular plate to move under force and pull the second annular cylinder towards the side closer to the first annular cylinder by the pull rope. Thus, the second annular cylinder drives the positioning block to abut against the threaded side wall and adaptively lock and limit the anti-loosening bolt. Moreover, the cooperation between the thread and the positioning block can limit the second annular cylinder, preventing the first and second annular cylinders from loosening with the anti-loosening bolt when subjected to vibration, thereby further improving the stability of the anti-loosening bolt during use.

[0024] Second, the present invention utilizes the friction generated by the anti-slip pad sliding against the threaded sidewall of the anti-loosening bolt to limit the movement of the push cylinder, preventing the push cylinder from rotating due to human error or external contact, which would prevent the anti-loosening bolt from fastening parts of a specified thickness. Furthermore, adjusting the position of the push cylinder can limit the position of the first annular cylinder, thereby adjusting the distance between the head of the first annular cylinder and the anti-loosening bolt in the locked state, thus enabling the fastening of parts of different thicknesses.

[0025] Third, this invention applies a pushing force to the screw frame through the pushing cylinder, which can drive the second annular cylinder to move closer to the first annular cylinder, causing the positioning block and the threaded side wall of the anti-loosening bolt to abut against each other, thereby completing the initial locking and limiting of the anti-loosening bolt and nut. At the same time, the snap-fit ​​block can be controlled to abut against the limiting groove and perform secondary locking and limiting of the anti-loosening bolt, thereby fixing the anti-loosening bolt and nut relatively, preventing them from loosening when subjected to vibration, and thus enabling the anti-loosening bolt to be quickly locked and limited, thereby achieving the function of rapid installation and convenient operation.

[0026] Fourth, this invention shortens the force-bearing distance of the positioning cylinder by rotating the actuator rod and causing the fixed locking block to slide into the guide groove. At the same time, the wedge block releases the squeezing effect on the pushing rod, and the pushing rod drives the locking block to retract and reset into the receiving groove, thereby releasing the engagement between the locking block and the limiting groove, and restoring the normal movement between the anti-loosening bolt and the nut, thus enabling the anti-loosening bolt to be quickly unlocked. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the structure between the anti-loosening bolt and the nut part of the present invention.

[0030] Figure 3 This is a schematic diagram of the first structure between the anti-loosening bolt and the fastening mechanism of the present invention.

[0031] Figure 4 This is a schematic diagram of the second structure between the anti-loosening bolt and the fastening mechanism of the present invention.

[0032] Figure 5 This is a schematic diagram of the structure between the first annular cylinder, the second annular cylinder, and the fastening mechanism of the present invention.

[0033] Figure 6 This is a schematic diagram of the structure between the anti-loosening bolt and the push cylinder of the present invention.

[0034] Figure 7 This is the present invention. Figure 6 A magnified view of a portion at point F.

[0035] Figure 8 This is a diagram showing the working state between the anti-loosening bolt and the fastening mechanism of the present invention.

[0036] Figure 9 This is the present invention. Figure 8 A magnified view of a portion of point G.

[0037] Figure 10 This is a schematic diagram of the structure between the first annular cylinder, the second annular cylinder, and the limiting mechanism of the present invention.

[0038] Figure 11 This is a schematic diagram of the structure between the second annular cylinder and the limiting mechanism of the present invention.

[0039] Figure 12 This is the present invention. Figure 11 A magnified view of part J.

[0040] Figure 13 This is the present invention. Figure 11 A magnified view of a portion of point H.

[0041] In the diagram, 1. Mounting plate; 2. Anti-loosening bolt; 21. Thread; 3. Nut part; 31. First annular cylinder; 32. Telescopic rod; 33. Second annular cylinder; 34. Fastening mechanism; 341. Annular plate; 342. Screw frame; 343. Positioning block; 344. Support spring; 345. Sliding groove; 346. Pull rope; 347. Pushing cylinder; 348. Ball bearing; 349. Anti-slip component; 350. Top extension spring rod; 351. Mounting groove; 35 2. Anti-slip mat; 353. Control pin; 36. Limiting mechanism; 361. Snap-fit ​​block; 362. Push rod; 363. Ring frame; 364. Retraction spring; 365. Limiting groove; 366. Auxiliary component; 367. Baffle; 368. Push-pull groove; 369. Top contact rod; 370. Vertical plate; 371. Support plate; 372. Wedge block; 373. Positioning cylinder; 374. Actuating rod; 375. Return spring; 376. Fixing block. Detailed Implementation

[0042] The following is in conjunction with the appendix Figures 1-13 The embodiments of the present invention will be described in detail, but the present invention may be implemented in many different ways as defined and covered by the claims.

[0043] This application discloses a quick-installation trapezoidal subway bolt. It is primarily used in the anti-loosening process after bolt installation. Technically, it can quickly lock and limit the anti-loosening bolt 2 and the nut portion 3, and can also quickly unlock them. Specifically, during the locking process of the anti-loosening bolt 2, the contact between the positioning block 343 and the side wall of the thread 21 on the outer wall of the anti-loosening bolt 2, as well as the cooperation between the snap-fit ​​block 361 and the limiting groove 365, enables multi-stage locking and limiting of the anti-loosening bolt 2 and the nut portion 3. Furthermore, this quick-installation trapezoidal subway bolt can also quickly remove the snap-fit ​​block 361 from the limiting groove 365, thereby quickly unlocking the anti-loosening bolt 2 and the nut portion 3, achieving a quick installation effect.

[0044] Example 1:

[0045] Reference Figure 1 As shown, in order to achieve a better anti-loosening effect on the anti-loosening bolt 2, a quick-installation trapezoidal subway bolt is provided in a specific embodiment of this solution. It includes an installation plate 1 set on a subway vehicle or subway track, an anti-loosening bolt 2 rotatably connected to the installation plate 1, a thread 21 provided on the outer wall of the anti-loosening bolt 2, and a nut part 3 sleeved on the outer wall of the anti-loosening bolt 2 by means of thread 21 connection.

[0046] In practical applications, the anti-loosening bolt 2 is first passed through the mounting plate 1, and then the nut part 3 is sleeved on the outer wall of the anti-loosening bolt 2 and engaged with the thread 21; at the same time, the nut part 3 can limit the anti-loosening bolt 2 to prevent it from loosening under vibration.

[0047] Reference Figure 1 and Figure 2 As shown, ordinary nuts are prone to loosening from bolts when subjected to vibration, which can cause them to fall off. Therefore, it is necessary to lock and limit the bolt and nut in the meshing state. Specifically, the nut part 3 includes a first annular cylinder 31 rotatably connected to the outer wall of the anti-loosening bolt 2. A second annular cylinder 33 is installed on the side of the first annular cylinder 31 away from the head of the anti-loosening bolt 2 through multiple annularly distributed telescopic rods 32. The telescopic rods 32 can fix the first annular cylinder 31 and the second annular cylinder 33 accordingly, so that they can only move axially and cannot rotate relative to each other. A fastening mechanism 34 is provided between the first annular cylinder 31 and the second annular cylinder 33, and a limit mechanism 36 is provided on the second annular cylinder 33.

[0048] In practical applications, after the anti-loosening bolt 2 passes through the mounting plate 1, the first annular cylinder 31 and the second annular cylinder 33 are fitted onto the outer wall of the anti-loosening bolt 2 as a whole. At the same time, the anti-loosening bolt 2 can be locked and limited in multiple stages by the fastening mechanism 34 and the limiting mechanism 36, thereby preventing the anti-loosening bolt 2 from loosening under vibration and ensuring the stability of the anti-loosening bolt 2 during use.

[0049] Reference Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, in order to prevent the anti-loosening bolt 2 from loosening at will, in a specific embodiment of this solution, the friction between the anti-loosening bolt 2 and the thread 21 on the outer wall of the anti-loosening bolt 2 is increased to achieve the purpose of tightening the anti-loosening bolt 2; specifically, the fastening mechanism 34 includes a screw frame 342 installed on the inner side wall of the first annular cylinder 31 through an annular plate 341 and meshing with the thread 21, and the annular plate 341 and the screw frame 342 on its inner side wall can form a nut that meshes with the thread 21.

[0050] It should be explained in detail that the inner diameter of the annular plate 341 is greater than the tooth height of the thread 21, so that the inner wall of the annular plate 341 does not contact the thread 21; the distance between the inner wall of the screw carrier 342 and the outer wall of the anti-loosening bolt 2 is less than the tooth height of the thread 21, and the screw carrier 342 does not contact the outer wall of the anti-loosening bolt 2.

[0051] Furthermore, in this embodiment, the fastening mechanism 34 also includes positioning blocks 343. Multiple positioning blocks 343 are evenly arranged on the inner sidewall of the second annular cylinder 33. The multiple positioning blocks 343 are arranged in a spiral, and the pitch of the spiral structure formed by the multiple positioning blocks 343 is equal to the pitch of the thread 21. Multiple annularly distributed support springs 344 are evenly arranged between the second annular cylinder 33 and the first annular cylinder 31. The support springs 344 are arranged alternately with the telescopic rod 32. By setting the support springs 344, the first annular cylinder 31 and the second annular cylinder 33 always have a pushing force that moves in opposite directions, so that the distance between them is maximized when no other external force is applied.

[0052] In the specific implementation process, after the first annular cylinder 31 and the second annular cylinder 33 are sleeved on the outer wall of the anti-loosening bolt 2, the second annular cylinder 33 is squeezed towards the side closer to the first annular cylinder 31. At this time, the second annular cylinder 33 and the positioning block 343 on its inner sidewall have a tendency to move towards the side closer to the first annular cylinder 31, so that the positioning block 343 abuts against the side wall of the thread 21; thereby increasing the friction between the positioning block 343 and the thread 21, and thus initially locking the anti-loosening bolt 2 to prevent it from rotating randomly and falling off.

[0053] Furthermore, in order to facilitate the second annular cylinder 33 to drive the positioning block 343 to quickly lock the anti-loosening bolt 2, in a specific embodiment of this solution, a sliding groove 345 is provided on the inner side wall of the first annular cylinder 31, and the annular plate 341 is slidably connected in the sliding groove 345. A screw frame 342 that meshes with the thread 21 is installed on the inner side wall of the annular plate 341. The annular plate 341 and the screw frame 342 on its inner side wall can form a nut that meshes with the thread 21. A plurality of annularly distributed pull ropes 346 are evenly arranged on the side of the annular plate 341 away from the second annular cylinder 33. The end of the pull rope 346 away from the annular plate 341 passes through the first annular cylinder 31 and is connected to the second annular cylinder 33.

[0054] It should be explained in detail that the inner diameter of the annular plate 341 is greater than the tooth height of the thread 21, so that the inner wall of the annular plate 341 does not contact the thread 21; the distance between the inner wall of the screw carrier 342 and the outer wall of the anti-loosening bolt 2 is less than the tooth height of the thread 21, and the screw carrier 342 does not contact the outer wall of the anti-loosening bolt 2.

[0055] In the specific implementation process, after the anti-loosening bolt 2 is screwed into the mounting plate 1 to a certain depth, it can drive the annular plate 341 and the screw frame 342 to move as a whole towards the side closer to the second annular cylinder 33; at this time, the first annular cylinder 31 does not move, so during the movement of the annular plate 341, the second annular cylinder 33 can be pulled by the pull rope 346, so that the second annular cylinder 33 drives the positioning block 343 to move towards the side closer to the first annular cylinder 31, thereby making the positioning block 343 abut against the thread 21 on the outer wall of the anti-loosening bolt 2 (in Figure 8 (As shown in the figure), it is convenient to lock and limit the anti-loosening bolt 2 through the positioning block 343.

[0056] Reference Figure 6 , Figure 8 and Figure 9 As shown, in order to facilitate the self-adaptive locking of the anti-loosening bolt 2 by the positioning block 343, it is necessary to make the second annular cylinder 33 drive the positioning block 343 to move automatically towards the side closer to the first annular cylinder 31 during the rotation of the anti-loosening bolt 2. Based on this, in this embodiment, a pusher cylinder 347 is sleeved on the outer wall of the anti-loosening bolt 2 by means of a thread 21 connection. The width of the pusher cylinder 347 is greater than the pitch of the thread 21. Multiple annularly distributed balls 348 are evenly rotated and connected on the side of the pusher cylinder 347 away from the head of the anti-loosening bolt 2. An anti-slip component 349 is also provided inside the pusher cylinder 347.

[0057] It should be noted that in this embodiment, the push cylinder 347 is initially separated from the anti-loosening bolt 2, and the outer diameter of the push cylinder 347 is smaller than the inner diameter of the annular plate 341, so that the push cylinder 347 can be accommodated inside the annular plate 341.

[0058] In the specific implementation process, after the anti-loosening bolt 2 is inserted into the mounting plate 1, the pusher cylinder 347 is screwed into the outer wall of the anti-loosening bolt 2, and the pusher cylinder 347 is located on the side of the mounting plate 1 away from the head of the anti-loosening bolt 2; then the first annular cylinder 31 and the second annular cylinder 33 are screwed into the outer wall of the anti-loosening bolt 2 and moved towards the side closer to the mounting plate 1. When the first annular cylinder 31 drives the screw frame 342 to contact the ball 348 at the end of the pusher cylinder 347 through the annular plate 341, the pusher cylinder 347 and the ball 348 apply a pushing force to the screw frame 342, causing the screw frame 342 to move towards the side closer to the second annular cylinder 33 (in Figure 8 and 9 (as shown in the image).

[0059] At the same time, the screw frame 342 drives the annular plate 341 to move synchronously. The annular plate 341 applies a pulling force to the second annular cylinder 33 through the pull rope 346, moving it closer to the first annular cylinder 31. As a result, the second annular cylinder 33 drives the positioning block 343 to abut against the side wall of the thread 21 and adaptively lock and limit the anti-loosening bolt 2, which is convenient to operate. At the same time, the cooperation between the thread 21 on the outer wall of the anti-loosening bolt 2 and the positioning block 343 can limit the second annular cylinder 33, preventing the first annular cylinder 31 and the second annular cylinder 33 from loosening with the anti-loosening bolt 2 when subjected to vibration, thereby further improving the stability of the anti-loosening bolt 2 during use.

[0060] In this embodiment, the side of the screw carrier 342 away from the second annular cylinder 33 engages with the thread 21, so that when the pusher cylinder 347 pushes the screw carrier 342 toward the side closer to the second annular cylinder 33, the thread 21 will not obstruct the movement of the screw carrier 342, and the screw carrier 342 and the thread 21 can be separated, thereby facilitating the movement of the screw carrier 342 and the annular plate 341 within the sliding groove 345.

[0061] When the anti-loosening bolt 2 needs to be removed, the friction between the positioning block 343 and the thread 21 on the outer wall of the anti-loosening bolt 2 can be released by rotating the first annular cylinder 31 and the second annular cylinder 33 in the opposite direction. At the same time, the first annular cylinder 31 drives the annular plate 341 and the pusher cylinder 347 to gradually separate, so that the annular plate 341 loses the pushing force of the pusher cylinder 347, and the second annular cylinder 33 loses the pulling force applied to it by the annular plate 341 through the pull rope 346. Thus, the distance between the second annular cylinder 33 and the first annular cylinder 31 is restored to the maximum under the action of the support spring 344. At the same time, the second annular cylinder 33 moves the annular plate 341 away from the second annular cylinder 33 to reset through the pull rope 346, thereby releasing the locking limit on the anti-loosening bolt 2.

[0062] Example 2:

[0063] Reference Figure 7 and Figure 9 As shown, based on Embodiment 1, since the mounting plates 1 have different thicknesses, the anti-loosening bolts 2 need to be tightened for mounting plates 1 of different thicknesses. Furthermore, since the mounting plates 1 are located between the head of the anti-loosening bolt 2 and the first annular cylinder 31 after the anti-loosening bolt 2 passes through them, the distance between the first annular cylinder 31 and the head of the anti-loosening bolt 2 needs to be adjusted according to the parts it is used to tighten. That is, the position of the pusher cylinder 347 needs to be adjusted according to the position of the first annular cylinder 31 screwed into the outer wall of the anti-loosening bolt 2, thereby limiting the first annular cylinder 31 to a specified position so that the anti-loosening bolt 2 can tighten parts of different thicknesses. Based on this, the pusher cylinder 347 can be rotated, causing it to rotate along the anti-loosening bolt 2 and move along its axis, thus facilitating the adjustment of the position of the pusher cylinder 347.

[0064] However, after the push cylinder 347 is adjusted, it is prone to rotation under external force, which causes the position of the push cylinder 347 to change. If the distance between the push cylinder 347 and the head of the anti-loosening bolt 2 is too small, the first annular cylinder 31 and the second annular cylinder 33 need to move a large distance along the anti-loosening bolt 2 to lock and limit it, but cannot fasten parts with a large thickness. If the distance between the push cylinder 347 and the head of the anti-loosening bolt 2 is too large, the first annular cylinder 31 and the second annular cylinder 33 only need to move a small distance along the anti-loosening bolt 2 to achieve the locking and limiting of the anti-loosening bolt 2, but cannot fasten parts with a small thickness.

[0065] Therefore, after the push cylinder 347 is adjusted to the designated position, the corresponding limit needs to be set. Specifically, the anti-slip component 349 includes a top extension spring rod 350. The push cylinder 347 has two symmetrical mounting slots 351 along its width direction. The top extension spring rod 350 is installed inside the mounting slot 351. The end of the top extension spring rod 350 away from the mounting slot 351 is hinged to an anti-slip pad 352 through a linkage plate.

[0066] Furthermore, in this embodiment, two through holes with connecting mounting grooves 351 are opened on the outer wall of the push cylinder 347. A control pin 353 is installed on the outer wall of the anti-slip pad 352. The control pin 353 extends to the outside after passing through the through hole. The outer wall of the control pin 353 is flush with the outer wall of the push cylinder 347, and the outer wall of the control pin 353 is provided with a corrugated groove for increasing friction.

[0067] In the specific implementation process, the top extension spring rod 350 always applies a pushing force to the anti-slip pad 352 pointing towards the end of the push cylinder 347. After the push cylinder 347 is screwed into the outer wall of the anti-loosening bolt 2, the anti-slip pad 352 slides against the side wall of the thread 21 on the outer wall of the anti-loosening bolt 2. In this way, the friction generated between the anti-slip pad 352 and the thread 21 can limit the push cylinder 347 accordingly, preventing the push cylinder 347 from rotating arbitrarily and causing the anti-loosening bolt 2 to be unable to fasten parts of a specified thickness. Moreover, adjusting the position of the push cylinder 347 can limit the position of the first annular cylinder 31, thereby adjusting the distance between the head of the first annular cylinder 31 and the anti-loosening bolt 2 in the locked state, so as to fasten parts of different thicknesses.

[0068] It should be further explained that the friction between the anti-slip pad 352 and the thread 21 can be used to prevent the push cylinder 347 from rotating due to human error or external contact. In practical applications, the control pin 353 can be moved to the side closer to the middle of the push cylinder 347. The control pin 353 drives the anti-slip pad 352 to move closer to the inside of the mounting groove 351, so that the anti-slip pad 352 disengages from the thread 21 on the outer wall of the anti-loosening bolt 2, thereby releasing the limit on the push cylinder 347 and making it easier to continue rotating the push cylinder 347. Then, the control pin 353 is released, and the anti-slip pad 352 can abut against the side wall of the thread 21 again under the action of the extension spring rod 350, thereby limiting the push cylinder 347 again.

[0069] Example 3:

[0070] Reference Figure 10 , Figure 11 and Figure 12 As shown, based on Embodiment 1, although the friction between the positioning block 343 and the thread 21 can lock and limit the anti-loosening bolt 2 and the nut part 3, when the anti-loosening bolt 2 vibrates, the positioning block 343 and the thread 21 will lose friction under the action of vibration, which will lead to the loosening of the anti-loosening bolt 2 and the nut part 3. In order to avoid this situation, it is necessary to further limit the anti-loosening bolt 2 and the nut part 3. Specifically, the limiting mechanism 36 includes a pushing rod 362. Multiple annularly distributed limiting grooves are evenly opened inside the second annular cylinder 33. A receiving groove is opened on the side of the limiting groove near the axis of the second annular cylinder 33. The pushing rod 362 is slidably connected inside the limiting groove. A locking block 361 is installed at the end of the pushing rod 362 near the axis of the second annular cylinder 33 and slidably connected inside the receiving groove. An auxiliary component 366 is also provided on the second annular cylinder 33 to control the locking block 361 to abut against the limiting groove 365.

[0071] It should be noted that, in order to enhance the locking effect of the anti-loosening bolt 2, multiple limiting grooves 365 corresponding to the positions of the locking block 361 need to be evenly opened on its outer wall during the manufacturing process of the anti-loosening bolt 2, so that the locking block 361 can abut against the limiting groove 365 to limit the anti-loosening bolt 2.

[0072] In the specific implementation process, when the second annular cylinder 33 drives the positioning block 343 to abut against the side wall of the thread 21, the pushing rod 362 drives the locking block 361 to move closer to the anti-loosening bolt 2, so that the locking block 361 is inserted into the limiting groove 365; thus, the cooperation between the locking block 361 and the limiting groove 365 can further limit the anti-loosening bolt 2, preventing the anti-loosening bolt 2 and the nut part 3 from loosening under vibration.

[0073] Reference Figure 11 , Figure 12 and Figure 13 As shown, to facilitate faster positioning of the anti-loosening bolt 2, this specific embodiment provides an auxiliary component 366 for the automatic insertion of the locking block 361 into the limiting groove 365. Specifically, the auxiliary component 366 includes multiple annularly distributed push-pull grooves 368 formed inside the second annular cylinder 33. The push-pull grooves 368 are connected to the limiting slide groove. One end of the pushing rod 362, away from the axis of the second annular cylinder 33, extends into the push-pull groove 368. The second annular cylinder 33 is closer to the first annular cylinder 31. A top contact rod 369 is installed on the side. The end of the top contact rod 369 away from the first annular cylinder 31 extends into the push-pull groove 368 and then a vertical plate 370 is installed. A support plate 371 is provided on the side of the vertical plate 370 away from the top contact rod 369. A wedge block 372 is provided on the side of the support plate 371 close to the axis of the second annular cylinder 33. The side of the wedge block 372 away from the top contact rod 369 is a contact surface that gradually tilts away from the axis of the second annular cylinder 33. The contact surface slides against the end of the push rod 362.

[0074] Furthermore, in this embodiment, an annular frame 363 is sleeved on the outer wall of the push rod 362, and a plurality of annularly distributed contraction springs 364 are evenly arranged between the annular frame 363 and the inner wall of the limiting slide groove; the contraction springs 364 always apply a contraction force to the annular frame 363 and the push rod 362 in a direction away from the axis of the second annular cylinder 33, so that the push rod 362 drives the locking block 361 to retract in the receiving groove in the initial state, thereby preventing the locking block 361 from extending out of the receiving groove and causing the second annular cylinder 33 to be unable to be sleeved on the outer wall of the anti-loosening bolt 2.

[0075] Furthermore, the side of the push rod 362 away from the locking block 361 has an elastic telescopic structure, which allows the push rod 362 to extend under its own elasticity without external force. The elasticity of the push rod 362 is greater than that of the contraction spring 364. When the push rod 362 is not subjected to external force other than its own elasticity and the elasticity of the contraction spring 364, the elasticity of the push rod 362 can overcome the elasticity of the contraction spring 364 and push the locking block 361 out of the storage slot.

[0076] In addition, two baffles 367 are symmetrically hinged along the length of the storage groove near the axis of the second annular cylinder 33 by a torsion spring. The baffles 367 are flush with the inner wall of the second annular cylinder 33 and will not affect the fit between the second annular cylinder 33 and the anti-loosening bolt 2. The torsion spring always applies a torsional force to the baffles 367 in a direction away from the axis of the second annular cylinder 33, so that the baffles 367 abut against the outer wall of the locking block 361 in the initial state. It should be noted that the torsional force applied by the torsion spring to the baffles 367 is greater than the pushing force of the pushing rod 362 on the locking block 361. Therefore, when the baffles 367 restrict the locking block 361 inside the storage groove, the pushing rod 362 cannot push the locking block 361 out.

[0077] In the specific implementation process, when the annular plate 341 drives the second annular cylinder 33 to move closer to the first annular cylinder 31 via the pull rope 346, the second annular cylinder 33 drives the top contact rod 369 to move synchronously. When the top contact rod 369 contacts the end of the first annular cylinder 31, the first annular cylinder 31 applies a reaction force to the top contact rod 369, causing the top contact rod 369 to drive the vertical plate 370, the support plate 371, and the wedge block 372 to move away from the first annular cylinder 31 as a whole. When the contact surface of the wedge block 372 abuts against the end of the pushing rod 362, the wedge block 372 applies a squeezing force to the pushing rod 362. At this time, the telescopic end of the pushing rod 362 retracts but cannot push the locking block 361 out of the receiving groove, so as not to affect the normal meshing between the nut part 3 and the anti-loosening bolt 2. Then the first annular cylinder 31 and the second annular cylinder 33 can continue to move along the outer wall of the anti-loosening bolt 2.

[0078] As the distance between the second annular cylinder 33 and the first annular cylinder 31 gradually decreases, the squeezing force exerted by the wedge block 372 on the pushing rod 362 gradually increases. When the positioning block 343 abuts against the thread 21 side wall of the outer wall of the anti-loosening bolt 2, the locking block 361 is displaced to the limiting groove 365. At this time, the squeezing force exerted by the wedge block 372 on the pushing rod 362 is at its maximum, causing the telescopic end of the pushing rod 362 to retract to its shortest state under the squeezing force. Thus, the pushing rod 362 can overcome the torsional force exerted by the torsion spring on the locking block 361 and pop the locking block 361 out of the receiving groove, so that the locking block 361 abuts against the limiting groove 365.

[0079] In summary, by applying a pushing force to the screw frame 342 through the pushing cylinder 347, the second annular cylinder 33 can be moved closer to the first annular cylinder 31, causing the positioning block 343 and the threaded sidewall 21 of the outer wall of the anti-loosening bolt 2 to abut against each other, thereby completing the initial locking and limiting of the anti-loosening bolt 2 and the nut part 3; at the same time, the snap-fit ​​block 361 can be controlled to abut against the limiting groove 365 and perform secondary locking and limiting of the anti-loosening bolt 2, thereby fixing the anti-loosening bolt 2 and the nut part 3 relatively, preventing them from loosening when subjected to vibration, and thus enabling the anti-loosening bolt 2 to be quickly locked and limited, which is convenient to operate.

[0080] Continue to refer to Figure 13 As shown, when removing the anti-loosening bolt 2 and nut 3, the snap-fit ​​block 361 needs to be removed from the limiting groove 365. Specifically, the top contact rod 369 consists of a positioning cylinder 373, an actuator rod 374, and a return spring 375. The positioning cylinder 373 is installed on the side of the vertical plate 370 away from the support plate 371. The actuator rod 374 is movably connected inside the positioning cylinder 373. The return spring 375 is rotatably connected between the end of the actuator rod 374 and the inner bottom wall of the positioning cylinder 373. Two guide grooves are symmetrically opened on the inner wall of the positioning cylinder 373 along the actuator rod 374. Two fixing blocks 376 are symmetrically arranged on the outer wall of the actuator rod 374.

[0081] In this embodiment, the return spring 375 always applies a contraction force to the actuator 374 pointing towards the second annular cylinder 33, so that the actuator 374 has a contraction force to insert into the positioning cylinder 373 in the initial state; in addition, in the initial state, the fixing block 376 on the outer wall of the actuator 374 abuts against the end of the positioning cylinder 373 and is arranged alternately with the guide groove. Through the mutual cooperation between the fixing block 376 and the positioning cylinder 373, the positioning cylinder 373 and the actuator 374 can be limited accordingly, thereby extending the force-bearing distance of the positioning cylinder 373.

[0082] Since the distance between the first annular cylinder 31 and the second annular cylinder 33 cannot be changed when the anti-loosening nut and nut part 3 are in the locked and limited state, it is necessary to adjust the force distance of the positioning cylinder 373 when the control latching block 361 is removed from the limiting groove 365, so as to facilitate the reset of the wedge block 372 and release the squeezing force on the push rod 362; the specific operation steps are as follows:

[0083] Rotating the actuator 374 causes the fixed block 376 to rotate and move to the guide groove. At this time, the fixed block 376 loses the support of the positioning cylinder 373, and the actuator 374, under the action of the return spring 375, causes the fixed block 376 to slide into the guide groove. This shortens the force distance of the positioning cylinder 373, and the actuator 374 no longer contacts the first annular cylinder 31. Subsequently, under the combined action of the extension end of the push rod 362 and the contraction spring 364, the push rod 362 presses the wedge block 372 towards the side closer to the first annular cylinder 31, thereby relieving the pressing effect of the wedge block 372 on the push rod 362. The push rod 362 also causes the locking block 361 to retract and reset into the receiving groove, thereby releasing the engagement between the locking block 361 and the limiting groove 365, thus restoring the normal movement between the anti-loosening bolt 2 and the nut part 3, and enabling the anti-loosening bolt 2 to be quickly unlocked.

[0084] During operation: First step: After the anti-loosening bolt 2 passes through the mounting plate 1, screw the pusher cylinder 347 into the outer wall of the anti-loosening bolt 2, and then fit the first annular cylinder 31 and the second annular cylinder 33 together on the outer wall of the anti-loosening bolt 2 and move them towards the side closer to the mounting plate 1.

[0085] Step 2: When the first annular cylinder 31 drives the screw frame 342 to contact the ball 348 at the end of the pusher cylinder 347 via the annular plate 341, the pusher cylinder 347 and the ball 348 apply a pushing force to the screw frame 342, causing the screw frame 342 to drive the annular plate 341 to move towards the side closer to the second annular cylinder 33. The annular plate 341 applies a pulling force to the second annular cylinder 33 via the pull rope 346 to move it closer to the first annular cylinder 31. As a result, the second annular cylinder 33 drives the positioning block 343 to abut against the side wall of the thread 21 and adaptively lock and limit the anti-loosening bolt 2.

[0086] Step 3: After screwing the pusher cylinder 347 into the outer wall of the anti-loosening bolt 2, the anti-slip pad 352 slides against the side wall of the thread 21 on the outer wall of the anti-loosening bolt 2; thus, the friction between the anti-slip pad 352 and the thread 21 can limit the pusher cylinder 347 accordingly, preventing the pusher cylinder 347 from rotating at will and causing the anti-loosening bolt 2 to fail to tighten the parts of the specified thickness.

[0087] In addition, the control pin 353 can be moved to move the anti-slip pad 352 closer to the inside of the mounting groove 351, thereby relieving the contact between the anti-slip pad 352 and the thread 21 on the outer wall of the anti-loosening bolt 2, so that the push cylinder 347 can continue to rotate; then the control pin 353 is released, and the anti-slip pad 352 can be pressed against the side wall of the thread 21 again under the action of the extension spring rod 350, thereby limiting the push cylinder 347 again.

[0088] Step 4: When the second annular cylinder 33 moves closer to the first annular cylinder 31, it drives the top contact rod 369 to move synchronously. When the top contact rod 369 contacts the end of the first annular cylinder 31, the top contact rod 369 drives the vertical plate 370, the support plate 371 and the wedge block 372 to move away from the first annular cylinder 31 as a whole, so that the wedge block 372 applies a squeezing force to the pushing rod 362. At this time, the telescopic end of the pushing rod 362 retracts but cannot push the locking block 361 out of the receiving groove.

[0089] As the distance between the second annular cylinder 33 and the first annular cylinder 31 gradually decreases, the squeezing force exerted by the wedge block 372 on the pushing rod 362 gradually increases. When the positioning block 343 abuts against the thread 21 side wall of the outer wall of the anti-loosening bolt 2, the locking block 361 is displaced to the limiting groove 365. At this time, the squeezing force exerted by the wedge block 372 on the pushing rod 362 is at its maximum, causing the telescopic end of the pushing rod 362 to retract to its shortest state under the squeezing force. Thus, the pushing rod 362 can overcome the torsional force exerted by the torsion spring on the locking block 361 and pop the locking block 361 out of the receiving groove, so that the locking block 361 abuts against the limiting groove 365, thereby relatively fixing the anti-loosening bolt 2 and the nut part 3, preventing them from loosening when subjected to vibration, and thus enabling the anti-loosening bolt 2 to be quickly locked and limited.

[0090] Step 5: When it is necessary to remove the anti-loosening bolt 2, rotate the actuator 374. The actuator 374 drives the fixing block 376 to slide into the guide groove, thereby shortening the force distance of the positioning cylinder 373. Then, under the combined action of the extension end of the push rod 362 and the contraction spring 364, the push rod 362 pushes the wedge block 372 towards the side closer to the first annular cylinder 31, thereby relieving the squeezing effect of the wedge block 372 on the push rod 362. The push rod 362 also drives the locking block 361 to retract and reset into the receiving groove, thereby releasing the engagement between the locking block 361 and the limiting groove 365, thus restoring the normal movement between the anti-loosening bolt 2 and the nut part 3, and thus enabling the anti-loosening bolt 2 to be quickly unlocked.

[0091] Step 6: Reverse rotation of the first annular cylinder 31 and the second annular cylinder 33 releases the friction between the positioning block 343 and the thread 21 on the outer wall of the anti-loosening bolt 2, thereby releasing the locking limit on the anti-loosening bolt 2; at the same time, the first annular cylinder 31 causes the annular plate 341 and the pusher cylinder 347 to gradually separate, the annular plate 341 loses the pushing force of the pusher cylinder 347, and the second annular cylinder 33 loses the tension applied to it by the annular plate 341 through the pull rope 346, so that the distance between the second annular cylinder 33 and the first annular cylinder 31 is restored to the maximum under the action of the support spring 344; at the same time, the second annular cylinder 33 moves the annular plate 341 away from the second annular cylinder 33 and resets it through the pull rope 346.

[0092] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0093] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A quick installation ladder-shaped subway bolt, comprising a mounting plate (1) arranged on a subway vehicle or a subway track, a locking bolt (2) being rotatably connected to the mounting plate (1), and a thread (21) being arranged on the outer wall of the locking bolt (2), characterized in that: The outer wall of the anti-loose bolt (2) is sleeved with a nut part (3) through a threaded (21) connection, wherein: The nut part (3) comprises a first annular cylinder (31) rotatably connected to the outer wall of the anti-loose bolt (2), the first annular cylinder (31) is provided on the side away from the head of the anti-loose bolt (2) with a second annular cylinder (33) through a plurality of annularly distributed expansion rods (32), a fastening mechanism (34) is arranged between the first annular cylinder (31) and the second annular cylinder (33), the fastening mechanism (34) comprises a spiral frame (342) mounted on the inner side wall of the first annular cylinder (31) through an annular plate (341) and engaged with the threaded (21), a limiting mechanism (36) is arranged on the second annular cylinder (33), the limiting mechanism (36) comprises a clamping block (361) arranged in the second annular cylinder (33); The fastening mechanism (34) further comprises a positioning block (343), the inner side wall of the second annular cylinder (33) is uniformly provided with a plurality of positioning blocks (343), the plurality of positioning blocks (343) are spirally arranged, and the pitch of the spiral structure formed by the plurality of positioning blocks (343) is equal to the pitch of the threaded (21), a plurality of annularly distributed supporting springs (344) are uniformly arranged between the second annular cylinder (33) and the first annular cylinder (31), and the supporting springs (344) are arranged alternately with the expansion rods (32); The inner side wall of the first annular cylinder (31) is provided with a sliding groove (345), the annular plate (341) is slidingly connected in the sliding groove (345), and the side of the annular plate (341) away from the second annular cylinder (33) is uniformly provided with a plurality of annularly distributed pull ropes (346), one end of the pull rope (346) away from the annular plate (341) is connected with the second annular cylinder (33) after penetrating through the first annular cylinder (31); The fastening mechanism (34) further comprises a pushing cylinder (347), the outer wall of the anti-loose bolt (2) is sleeved with the pushing cylinder (347) through the threaded (21) connection, the width of the pushing cylinder (347) is greater than the pitch of the threaded (21), a plurality of annularly distributed balls (348) are rotatably connected to the side of the pushing cylinder (347) away from the head of the anti-loose bolt (2), and an anti-skid assembly (349) is further arranged in the pushing cylinder (347).

2. A quick installation trapezoidal subway bolt according to claim 1, characterized in that: The anti-skid assembly (349) comprises a top extension spring rod (350), two installation grooves (351) are symmetrically formed in the pushing cylinder (347) along the width direction thereof, the top extension spring rod (350) is arranged in the installation groove (351), one end of the top extension spring rod (350) away from the installation groove (351) is hingedly connected with an anti-skid pad (352) through a linkage plate, and the anti-skid pad (352) is slidingly abutted against the side wall of the threaded (21).

3. A quick installation trapezoidal subway bolt according to claim 1, characterized in that: The inner diameter of the annular plate (341) is greater than the height of the thread (21), so that the inner side wall of the annular plate (341) is not in contact with the thread (21), the distance between the inner side wall of the spiral frame (342) and the outer side wall of the locking bolt (2) is less than the height of the thread (21), and the spiral frame (342) is not in contact with the outer wall of the locking bolt (2), the outer diameter of the push cylinder (347) is less than the inner diameter of the annular plate (341), and the ball (348) at the end of the push cylinder (347) is in rolling contact with the spiral frame (342).

4. A quick installation trapezoidal subway bolt according to claim 2, characterized in that: The push cylinder (347) is provided with two through holes communicating with the installation grooves (351), the anti-skid pad (352) is provided with a control pin (353) on the outer side wall, the control pin (353) extends to the outside after passing through the through hole, the outer side wall of the control pin (353) is flush with the outer side wall of the push cylinder (347), and the outer side wall of the control pin (353) is provided with corrugated grooves for increasing friction.

5. A quick installation trapezoidal subway bolt according to claim 1, characterized in that: The limiting mechanism (36) further comprises a pushing rod (362), a plurality of annular limiting sliding grooves are uniformly arranged in the second annular cylinder (33), a receiving groove is arranged on one side of the limiting sliding groove close to the axis of the second annular cylinder (33), the pushing rod (362) is slidably connected in the limiting sliding groove, the pushing rod (362) is provided with an annular frame (363) on the outer wall, a plurality of annular contraction springs (364) are uniformly arranged between the annular frame (363) and the inner wall of the limiting sliding groove, the pushing rod (362) is provided with a clamping block (361) slidably connected in the receiving groove on one end close to the axis of the second annular cylinder (33), the side of the pushing rod (362) away from the clamping block (361) is a flexible structure, a plurality of limiting grooves (365) corresponding to the positions of the clamping blocks (361) are uniformly arranged on the outer wall of the locking bolt (2), and an auxiliary part (366) for controlling the clamping block (361) to abut against the limiting groove (365) is further arranged on the second annular cylinder (33). Two baffles (367) are symmetrically hinged to the receiving groove on one side close to the axis of the second annular cylinder (33) through torsional springs along the length direction of the receiving groove, and the baffles (367) are flush with the inner side wall of the second annular cylinder (33).

6. A quick installation trapezoidal subway bolt according to claim 5, characterized in that: The auxiliary part (366) comprises a plurality of annularly distributed push-pull grooves (368) arranged inside the second annular barrel (33), the push-pull grooves (368) are communicated with the limiting sliding grooves, one end of the push rod (362) away from the axis of the second annular barrel (33) extends into the push-pull groove (368), the side of the second annular barrel (33) close to the first annular barrel (31) is provided with a top touch rod (369), one end of the top touch rod (369) away from the first annular barrel (31) extends into the push-pull groove (368) and is provided with an upright plate (370), the side of the upright plate (370) away from the top touch rod (369) is provided with a support plate (371), the side of the support plate (371) close to the axis of the second annular barrel (33) is provided with a wedge block (372), the side of the wedge block (372) away from the top touch rod (369) is a gradually inclined contact surface away from the axis of the second annular barrel (33), and the contact surface and the end of the push rod (362) slide and abut.

7. A quick installation trapezoidal subway bolt according to claim 6, characterized in that: The top touch rod (369) is composed of a positioning barrel (373), an execution rod (374) and a reset spring (375), wherein the positioning barrel (373) is installed on the side of the upright plate (370) away from the support plate (371), the execution rod (374) is movably connected in the positioning barrel (373), the reset spring (375) is rotatably connected between the end of the execution rod (374) and the inner bottom wall of the positioning barrel (373), and two guide sliding grooves are symmetrically arranged in the inner wall of the positioning barrel (373) along the execution rod (374). The outer wall of the execution rod (374) is symmetrically provided with two fixed clamping blocks (376).

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