Roadway transportation device based on rail pressure

Abstract

The invention relates to the technical field of mine transportation equipment, and discloses an in-lane transportation device based on rail pressure, which comprises a hanger rail body, a plurality of groups of walking carriers are arranged on the hanger rail body, every two adjacent walking carriers are fixedly connected through a flexible pipe, and the in-lane transportation device further comprises electric hoists arranged on the earth surface gravity center direction surfaces of the walking carriers, the surface of the electric hoist is fixedly connected with a loop chain, and the loop chain is used for lifting and transporting roadway goods in cooperation with the electric hoist in the working state. Through the arrangement of the synchronizing mechanism, the braking reliability of the monorail crane system in a large-dip-angle humid environment is remarkably improved, when the walking carrier brakes on a large-dip-angle ramp, the symmetrically-arranged triangular blocks draw close to the central axis of the walking carrier during braking, gaps between the wheels and the hanger rail body are accurately compensated through the wedge-shaped structures, and the braking reliability of the monorail crane system is improved. And meanwhile, the L-shaped block body is in contact with the I-shaped web plate of the hanger rail body for locking, so that the slipping phenomenon caused by wheel braking in a humid environment is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of mine transportation equipment technology, specifically to an in-tunnel transportation device based on track pressure. Background Technology

[0002] In coal mining, steeply inclined roadways along the goaf typically refer to roadways with an inclination angle exceeding 15° to 25°, with some extremely inclined coal seams reaching 30° to 45°. Due to the special engineering geological conditions of steeply inclined roadways, hydraulic support systems are usually used for roof control in terms of support. Due to the narrow cross-sectional dimensions and limited space of the roadways, the material transportation system mostly adopts a monorail hoisting transportation method arranged along the roof of the roadway.

[0003] Existing monorail transport systems employ a design combining a traveling motor drive with a chain hoist, offering a compact structure and stable operation under normal working conditions. However, in the high-temperature and high-humidity environment of steeply inclined tunnels, this system presents serious safety hazards. Ambient humidity reduces the track friction coefficient, making the traveling vehicle prone to slippage during braking, with a limit to braking performance. Simultaneously, braking inertia causes continuous chain oscillation, severely impacting operational safety and positioning accuracy. More significantly, adjusting the chain length under steep inclines presents a dilemma: too long a chain exacerbates oscillation, while too short a chain generates rigid tension that damages the hoist structure. These chain reactions triggered by environmental factors, including the combined effect of track slippage and chain oscillation, significantly reduce the system's reliability and safety, necessitating targeted solutions. Summary of the Invention

[0004] The purpose of this invention is to provide an in-tunnel transport device based on track pressure to solve the problem of brake slippage and chain oscillation caused by large inclination angles, as mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an in-tunnel transportation device based on track pressure, comprising a suspended rail body, on which several sets of traveling carriers are arranged, each adjacent traveling carrier being fixedly connected by a flexible tube; further comprising: an electric hoist, disposed on the ground surface in the direction of the center of gravity of each traveling carrier, wherein a chain is fixedly connected to the surface of the electric hoist, used in operation to cooperate with the electric hoist to lift and transport goods in the tunnel; and a stabilizing mechanism disposed on the electric hoist, the stabilizing mechanism comprising an L-tube fixedly connected to the electric hoist, wherein two sets of rectangular slots are symmetrically opened on opposite sides of the other end of the L-tube; wherein the depth of one set of rectangular slots is less than that of the other set of rectangular slots. The depth, the clearance component, is set inside each of the rectangular slots; the synchronization mechanism is set on the walking carrier, the synchronization mechanism includes a concave carrier fixedly connected to the surface of the walking carrier, the inner bottom surface of the concave carrier has a groove at the center, the inner bottom surface of the concave carrier has rectangular holes on both sides of the groove, the inner wall of the concave carrier has two sets of oblique slots; the drive component is set on the surface of the concave carrier; the synchronization component is set opposite to each other inside the concave carrier, and works with the drive component to perform safety intervention on the walking carrier under braking; the coordination component is set on the concave carrier, and based on the execution state of the synchronization component, works with the clearance component to provide safety protection for the chain.

[0006] Preferably, the clearance component includes a swing plate hinged inside the rectangular slot, and a plurality of curved blocks fixedly connected to the surface of the swing plate and in contact with the ring chain, and the plurality of curved blocks are equidistantly arranged along the swing plate.

[0007] Preferably, the drive assembly includes a drive motor fixedly connected to the concave carrier, and the output end of the drive motor is fixedly connected to a bidirectional threaded rod.

[0008] Preferably, the synchronization component includes push blocks disposed inside the concave carrier and slidably connected inside the groove. The two push blocks have rounded corners on their surfaces close to each other. A triangular block is fixedly connected to the surface of the push block. Two limiting rods are fixedly connected to the side of the push block away from the triangular block. An L-shaped block is slidably connected to the surface of the limiting rod. Guide wheels are rotatably connected to both sides of the L-shaped block.

[0009] Preferably, the guide wheel undergoes both rolling and sliding motions inside the inclined groove during its working state, and the push block is threadedly connected to the bidirectional threaded rod.

[0010] Preferably, the coordinating component includes a pressure rod slidably connected to the concave carrier and located below the push block. One end of the pressure rod is fixedly connected to a wedge block, and telescopic rods are symmetrically arranged on the surface of the wedge block away from the push block. A spring is provided inside the telescopic rod, and the other end of the telescopic rod is fixedly connected to the concave carrier. An annular ring is fixedly connected to the other end of the pressure rod.

[0011] Preferably, contact blocks are fixedly connected to both sides of the concave carrier surface adjacent to the walking carrier, and the contact blocks and the triangular blocks are located at the same horizontal height.

[0012] Preferably, the annular ring is slidably connected to the L-tube, and in the initial state, the annular ring and the hinge joint formed by the swing plate and the L-tube remain in a non-contact state.

[0013] Preferably, the L-shaped block does not contact the hanging rail body in the default state, but abuts against the hanging rail body in the working state.

[0014] Compared with the prior art, the beneficial effects of the present invention are: (1) By setting up a synchronization mechanism, the braking reliability of the monorail system in a humid environment with a large inclination angle is significantly improved. When the traveling vehicle brakes on a slope with a large inclination angle, the symmetrically arranged triangular blocks move towards the central axis of the traveling vehicle during braking. The wedge structure accurately compensates for the gap between the wheel and the rail body. At the same time, the L-shaped block contacts the I-shaped web of the rail body and locks, effectively avoiding the slippage phenomenon when the wheel brakes in a humid environment. (2) Through the coordinated cooperation of the components and the stabilizing mechanism, during normal transportation, the swing plate provides the main swing suppression along the transportation direction, while the swing plate in the axial direction of the roadway forms a secondary suppression barrier. When entering the braking stage, the push block drives the ring ring to gradually lock the chain of the electric hoist. In the initial stage, it maintains moderate flexible buffering, and in the final stage of braking, it achieves complete rigid fixation. The curved block contacts the hollow part of the chain of the electric hoist, completing the transition from free state to complete locking, avoiding chain damage caused by impact load. (3) Through the cooperation of the triangular block and the contact block, the dual functions of track maintenance and braking enhancement are realized. In the running environment, the contact block cleans up debris such as coal slag and water film on the I-shaped running surface of the rail body. After the triangular block gradually enters the interior of the contact block, the auxiliary braking effect of the triangular block is enhanced. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall installation structure of the device in the tunnel according to the present invention; Figure 2 This is a schematic diagram of the second-view structure of the device of the present invention; Figure 3 This is a schematic diagram of the overall third-view structure of the device of the present invention; Figure 4 This is a schematic diagram of the internal cross-sectional structure of the synchronization mechanism of the present invention; Figure 5 This is a schematic diagram of the internal second-view structure of the clamping synchronization mechanism of the present invention; Figure 6 This is a schematic diagram of the synchronization component structure of the present invention; Figure 7 This is a schematic diagram of the stabilizing mechanism and the disassembled structure of the electric hoist of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the stabilizing mechanism of the present invention; Figure 9 This is a schematic diagram of the coordination component and stabilization mechanism of the present invention.

[0016] In the diagram: 100, Suspension rail body; 101, Traveling carrier; 102, Flexible tube; 103, Electric hoist; 200, Stabilizing mechanism; 201, L-shaped tube; 202, Rectangular slot; 210, Swinging plate; 211, Curved block; 300, Synchronization mechanism; 301, Concave carrier; 302, Rectangular hole; 303, Angled slot; 304, Contact block; 310, Drive motor; 311, Bidirectional threaded rod; 320, Push block; 321, Triangular block; 322, Limiting rod; 323, L-shaped block; 324, Guide wheel; 330, Pressure rod; 331, Wedge block; 332, Annular ring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-9This invention provides a technical solution: an in-tunnel transportation device based on track pressure, comprising a suspended rail body 100, on which several sets of traveling carriers 101 are arranged, each adjacent traveling carrier 101 being fixedly connected by a flexible tube 102; further comprising: an electric hoist 103, arranged on the ground surface in the direction of the center of gravity of each traveling carrier 101, with a chain fixedly connected to the surface of the electric hoist 103, used in operation to cooperate with the electric hoist 103 to lift and transport goods in the tunnel; and a stabilizing mechanism 200, arranged on the electric hoist 103, the stabilizing mechanism 200 comprising an L-tube 201 fixedly connected to the electric hoist 103, with two sets of rectangular slots 202 symmetrically opened on opposite sides of the other end of the L-tube 201; the depth of one set of rectangular slots 202 being less than that of the other set of rectangular slots. The depth of 202, the clearance component, is set inside each rectangular slot 202. The synchronization mechanism 300 is set on the walking carrier 101. The synchronization mechanism 300 includes a concave carrier 301 fixedly connected to the surface of the walking carrier 101. A groove is opened in the center of the inner bottom surface of the concave carrier 301. Rectangular holes 302 are opened on both sides of the groove in the inner bottom surface of the concave carrier 301. Two sets of oblique slots 303 are opened opposite each other on the inner wall of the concave carrier 301. The drive component is set on the surface of the concave carrier 301. The synchronization component is set opposite to each other inside the concave carrier 301. It works with the drive component to perform safety intervention on the walking carrier 101 under braking. The coordination component is set on the concave carrier 301. Based on the execution state of the synchronization component, it works with the clearance component to provide safety protection for the chain.

[0019] It is important to note that the electric hoist 103, when used with a chain hoist, has a low installation height, making it suitable for narrow tunnels. In underground mines, there is also a transportation method using the electric hoist 103 in conjunction with a wire rope. The wire rope and electric hoist 103 work together for long-distance, large-span lightweight lifting tasks. In tunnel or track environments, the electric hoist 103 needs to be moved using existing technologies such as a traveling carrier 101 and a traveling motor, as shown in the diagram but not labeled. The braking system of the traveling carrier 101 (such as hydraulic clamps, friction pads, etc.) needs to balance weight, space, and cost, and its maximum braking force is usually designed for horizontal track conditions. When the slope angle increases, the component of gravity along the track direction (the sliding force) exceeds the maximum static friction force of the braking system, causing slippage. When braking on a slope, the load (such as the transported material) may sway or impact, further increasing the instantaneous sliding force, or exceeding the braking capacity on wet tracks.

[0020] The clearance assembly includes a swing plate 210, which is hinged inside a rectangular slot 202, and multiple curved blocks 211. The multiple curved blocks 211 are fixedly connected to the surface of the swing plate 210 and contact and cooperate with the ring chain. The multiple curved blocks 211 are equidistantly arranged along the swing plate 210.

[0021] During use, the height of one set of rectangular slots 202 aligned with the moving direction of the electric hoist 103 is higher than the height of the other set of rectangular slots 202. When the traveling carrier 101 is working, the oscillation trajectory aligned with the moving direction is larger, while the oscillation amplitude near the aisle is smaller. Affected by the braking of the traveling carrier 101, it will initially oscillate in the moving direction due to inertia under large inclination angles, and then the chain's movement trajectory will be conical. (See reference...) Figure 1-3 In the stationary state of the chain, due to the inherent characteristics of the chain, it is a series of interlocking rings. A tension spring is added between the swing plate 210 and the rectangular slot 202 to allow the swing plate 210 to quickly return to its original position when subjected to force, further reducing the swing amplitude. The elastic coefficient of the tension spring must be adapted to the inertial force of the chain to ensure that it can absorb the impact and quickly stabilize the chain. The curved block 211 contacts the hollow part of the chain, and the curved block 211 is made of rubber. The two curved blocks 211 in contact with the hollow part of the chain can better contact the chain. The two curved blocks 211 are located on both sides of the hollow part of the chain, forming a clamping effect, further suppressing the swing, reducing the swing duration of the chain, and shortening the swing decay time. When the traveling carrier 101 brakes, the chain swings significantly in the direction of movement due to inertia. The swing plate 210 limits the swing angle to prevent excessive deviation, so that the swing trajectory of the chain gradually converges and eventually stabilizes in a vertical state. A set of rectangular slots 202 at a low height limits the swing amplitude in the other direction.

[0022] The drive assembly includes a drive motor 310 fixedly connected to a concave carrier 301, and a bidirectional threaded rod 311 fixedly connected to the output end of the drive motor 310.

[0023] The synchronization component includes push blocks 320 disposed inside the concave carrier 301 and slidably connected inside the groove. The two push blocks 320 have rounded corner structures on their close surfaces. The push blocks 320 move on the bidirectional threaded rod 311 and are restricted by the groove. The rounded corner structure of the push blocks 320 inserts a rectangular hole 302 so that it can contact the wedge block 331. A triangular block 321 is fixedly connected to the surface of the push blocks 320. Two limiting rods 322 are fixedly connected to the side of the push blocks 320 away from the triangular block 321. An L-shaped block 323 is slidably connected to the surface of the limiting rod 322. The L-shaped block 323 is pulled by the push blocks 320 and slides on the limiting rod 322. Guide wheels 324 are rotatably connected to both sides of the L-shaped block 323.

[0024] During use, please refer to Figure 4-6The drive motor 310 drives the bidirectional threaded rod 311 to work. The two push blocks 320 are restricted inside the slide groove, so that they can only move left and right in a straight line. The two push blocks 320 move closer and further away from each other synchronously. Under auxiliary braking, the two push blocks 320 move closer to the wheel position of the traveling carrier 101. In the final state, the triangular block 321 is driven to be in the gap formed by the wheel of the traveling carrier 101 and the hanging rail body 100. The triangular block 321 is made of rigid material. When the triangular block 321 reaches its maximum stroke, the triangular block 321 enters the interior of the contact block 304, so that the contact block 304 changes from flexible It becomes rigid, which can also extend the service life of the triangular block 321 and restrict the operation of the wheel. When it gradually approaches the wheel of the walking carrier 101, the guide wheel 324 slides inside the inclined slot 303, driving the L-shaped block 323 to gradually approach the hanging rail body 100. When the triangular block 321 enters the contact block 304 and abuts against the hanging rail body 100, it achieves an auxiliary braking effect and enhances its positioning ability in a large tilting environment. After the large cargo near the center of gravity of the ground is unloaded under the electric hoist 103, the drive motor 310 works in reverse and moves the two push blocks 320 away from each other.

[0025] When the guide wheel 324 is in working condition, it simultaneously rolls and slides inside the inclined slot 303, and the push block 320 is threadedly connected to the bidirectional threaded rod 311.

[0026] During use, please refer to Figure 5 The L-shaped block 323 is brought closer by the two push blocks 320. As the L-shaped block 323 approaches each other, it gradually rises inside the inclined slot 303 and finally contacts the hanging rail body 100. The top friction surface is tightly pressed against the hanging rail body 100 to form friction braking.

[0027] The coordinating component includes a pressure rod 330 that is slidably connected to the concave carrier 301 and located below the push block 320. One end of the pressure rod 330 is fixedly connected to a wedge block 331. A telescopic rod is symmetrically arranged on the side of the wedge block 331 away from the push block 320. A spring is installed inside the telescopic rod. The other end of the telescopic rod is fixedly connected to the concave carrier 301. The other end of the pressure rod 330 is fixedly connected to an annular ring 332.

[0028] During use, please refer to Figure 6-9When the pusher 320 moves closer to each other inside the concave carrier 301, it gradually contacts the wedge block 331, causing the wedge block 331 to descend in the direction of gravity. The pressure rod 330 drives the annular ring 332 to first contact one of the swing plates 210, suppressing its left and right swaying. When the annular ring 332 reaches its maximum stroke, it will restrict the yielding of the other set of swing plates 210, completely restricting the swinging yielding space of the other set of swing plates 210 in the direction of transportation. The curved block 211 restricts the hollow part of the chain, locks the hollow part of the chain, prevents excessive swaying during unloading and braking, reduces unloading time, and is suitable for harsh environments such as narrow alleys.

[0029] It should be noted that in steeply inclined roadways, there is an asymmetric inertial force when the chain is braked. The force of the swing in the direction of transport is greater than the force in the other direction. The inertial force is large and the swing amplitude is significant. Therefore, the swing in the other direction is restricted first, and then the swing in the direction of transport is restricted a second time to avoid the electric hoist 103 being subjected to excessive chain force and resulting in a rigid impact effect.

[0030] Contact blocks 304 are fixedly connected to both sides of the concave carrier 301 adjacent to the walking carrier 101. The contact blocks 304 are made of rubber and have openings. The contact blocks 304 and the triangular block 321 are at the same horizontal height.

[0031] The annular ring 332 is slidably connected to the L-tube 201. In the initial state, the hinge joint formed by the annular ring 332, the swing plate 210, and the L-tube 201 remains in a non-contact state.

[0032] The L-shaped block 323 does not contact the hanging rail body 100 in the default state, but in the working state, the L-shaped block 323 abuts against the hanging rail body 100.

[0033] Working principle: See Figure 1Several sets of traveling carriers 101 are installed on the overhead rail body 100. Then, the electric hoist 103 is operated to pull the goods with the chain on the electric hoist 103. Then, the traveling carriers 101 start working. When the overhead rail body 100 in the tunnel is relatively parallel to the ground, the goods will cause the chain to swing. First, it will swing back and forth in the direction of transportation, or swing backward in the direction of travel, and then sway along a conical trajectory. At this time, the curved block 211 in the direction of travel contacts the chain, and then drives the swing plate 210 to work. At this time, the swing plate 210 moves against the forward direction. To suppress directional swaying, when the chain sways in other directions or oscillates in a conical trajectory, the two opposing curved blocks 211 effectively attenuate the swaying amplitude of the chain, shortening its swaying duration and reducing the rigid impact effect on the electric hoist 103. When unloading in a large-angle section, the traveling carrier 101 brakes on the overhead rail body 100 at the top of the tunnel. At this time, the drive motor 310 starts working, driving the bidirectional threaded rod 311 to start rotating, and the two push blocks 320 begin to move closer to each other. As the triangular blocks 321 on plate 20 approach each other until they are inside the contact block 304, the L-shaped block 323 is guided by the guide wheel 324 in the inclined slot 303. The L-shaped block 323 gradually approaches the suspension rail body 100 until it contacts the suspension rail body 100. The bidirectional threaded rod 311 stops working. At the same time, due to the approach of the push blocks 320, the wedge block 331 begins to move. The pressing rod 330 drives the annular ring 332 to slide on the surface of the swing plate 210, first suppressing the axial swing of the ring chain in the roadway. Plate 210 changes from flexible buffer to rigid fixation through curved block 211. Curved block 211 contacts the hollow part of the chain to fix the chain. As the ring 332 gradually descends, it locks the chain swing in the transport direction. This avoids the rigid impact of the chain caused by the sudden braking of the traveling carrier 101, and effectively suppresses the swing amplitude, ensuring that the chain surface is not damaged when locking. When loading goods, the chain can be completely locked or only accept swing in the transport direction, avoiding the problem of the swing hitting the hydraulic support inside the tunnel when loading goods.

[0034] The contents not described in detail in this description are existing technologies known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A roadway transport device based on track pressure, comprising a suspended rail body (100), wherein a plurality of sets of traveling carriers (101) are arranged on the suspended rail body (100), and each adjacent traveling carrier (101) is fixedly connected by a flexible tube (102), characterized in that, Also includes: An electric hoist (103) is installed on the ground surface in the direction of the center of gravity of each of the walking carriers (101). A chain is fixedly connected to the surface of the electric hoist (103). In the working state, it is used to cooperate with the electric hoist (103) to lift and transport goods in the tunnel. A stabilizing mechanism (200) is provided on the electric hoist (103). The stabilizing mechanism (200) includes an L-tube (201) fixedly connected to the electric hoist (103). Two sets of rectangular slots (202) are symmetrically opened on opposite sides of the other end of the L-tube (201). The depth of one set of rectangular slots (202) is less than the depth of the other set of rectangular slots (202). A clearance component is disposed inside each of the rectangular slots (202); A synchronization mechanism (300) is provided on the walking carrier (101). The synchronization mechanism (300) includes a concave carrier (301) fixedly connected to the surface of the walking carrier (101). A groove is provided in the center of the inner bottom surface of the concave carrier (301). Rectangular holes (302) are provided on both sides of the groove in the inner bottom surface of the concave carrier (301). Two sets of oblique slots (303) are provided on the inner wall of the concave carrier (301). The driving component is disposed on the surface of the concave carrier (301); The synchronization component is disposed inside the concave carrier (301) and works with the drive component to perform safety intervention on the braking carrier (101); The coordination component, set on the concave carrier (301), works with the yielding component to provide safety protection for the ring chain based on the execution state of the synchronization component.

2. The tunnel transport device based on track pressure according to claim 1, characterized in that: The yielding component includes a swing plate (210) hinged inside the rectangular slot (202) and a plurality of curved blocks (211). The plurality of curved blocks (211) are fixedly connected to the surface of the swing plate (210) and in contact with the ring chain. The plurality of curved blocks (211) are equidistantly arranged along the swing plate (210).

3. The tunnel transport device based on track pressure according to claim 2, characterized in that: The drive assembly includes a drive motor (310) fixedly connected to a concave carrier (301), and a bidirectional threaded rod (311) is fixedly connected to the output end of the drive motor (310).

4. The tunnel transport device based on track pressure according to claim 3, characterized in that: The synchronization component includes push blocks (320) disposed inside the concave carrier (301) and slidably connected inside the groove. The two push blocks (320) have rounded corners on their close surfaces. A triangular block (321) is fixedly connected to the surface of the push block (320). Two limiting rods (322) are fixedly connected to the side of the push block (320) away from the triangular block (321). An L-shaped block (323) is slidably connected to the surface of the limiting rod (322). Guide wheels (324) are rotatably connected to both sides of the L-shaped block (323).

5. The tunnel transport device based on track pressure according to claim 4, characterized in that: The guide wheel (324) rolls and slides simultaneously inside the inclined slot (303) in the working state, and the push block (320) is threadedly connected to the bidirectional threaded rod (311).

6. The tunnel transport device based on track pressure according to claim 5, characterized in that: The coordinating component includes a pressure rod (330) that is slidably connected to the concave carrier (301) and located below the push block (320). One end of the pressure rod (330) is fixedly connected to a wedge block (331). A telescopic rod is symmetrically arranged on the side of the wedge block (331) away from the push block (320). A spring is provided inside the telescopic rod. The other end of the telescopic rod is fixedly connected to the concave carrier (301). The other end of the pressure rod (330) is fixedly connected to an annular ring (332).

7. The tunnel transport device based on track pressure according to claim 6, characterized in that: The concave carrier (301) has contact blocks (304) fixedly connected to both sides of the walking carrier (101) on its surface. The contact blocks (304) and the triangular block (321) are at the same horizontal height.

8. The tunnel transport device based on track pressure according to claim 7, characterized in that: The annular ring (332) is slidably connected to the L-tube (201). In the initial state, the annular ring (332) and the hinge joint formed by the swing plate (210) and the L-tube (201) remain in a non-contact state.

9. A roadway transport device based on track pressure according to claim 8, characterized in that: The L-shaped block (323) does not contact the hanging rail body (100) in the default state, but in the working state, the L-shaped block (323) abuts against the hanging rail body (100).

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