Train evacuation ladder locking device based on ratchet wheel reset self-locking structure

Abstract

The utility model relates to the technical field of train evacuation ladder structures, and discloses a train evacuation ladder locking device based on a ratchet wheel reset self-locking structure, which is characterized by comprising a mounting plate, a limiting lock fork, a limiting pawl and an unlocking driving mechanism, the unlocking driving mechanism comprises a mounting seat and an unlocking part which can move relatively, the mounting seat is fixedly connected with the mounting plate, and a self-resetting locking structure is connected between the mounting seat and the unlocking part; the limiting pawl comprises a mounting end, an acting end and a driving end, and the driving end is rotationally connected with the unlocking part; the limiting lock fork comprises a lock fork notch, a self-locking step and a mounting part, and a self-resetting unlocking structure is connected between the limiting lock fork and the mounting plate; during no-load unlocking, the action end is driven to be separated from the self-locking step in response to the unlocking action of the unlocking part, and the lock fork notch moves to the unlocking position; in the locking process, the lock fork notch is driven to move to the locking position in response to the locking action of the external apron board assembly, and the acting end is connected with the self-locking step in a limiting mode.

Description

Technical Field

[0001] This utility model relates to the technical field of train evacuation ladder structures, and more specifically, it relates to a train evacuation ladder locking device based on a ratchet reset self-locking structure. Background Technology

[0002] With the acceleration of urbanization and the continuous expansion of urban peripheries, the volume of urban population flow has increased dramatically, leading to increasingly severe traffic congestion. Traditional public transportation can no longer meet the daily needs of urban residents. Therefore, urban rail transit, with its large capacity, high speed, and low pollution, has become an effective means of solving urban traffic problems. As people's living standards improve, the demand for public transportation is also constantly growing. With its speed, convenience, and environmental friendliness, urban rail transit is gradually becoming the preferred mode of transportation for urban residents.

[0003] Suburban trains typically operate in urban or suburban environments, which are complex and varied. The development of emergency evacuation systems for rail transit stems from a comprehensive need for passenger safety, regulatory compliance, technological advancements, operational efficiency, and public trust. With the increasing prevalence of rail transit, its importance has become increasingly prominent, making it an indispensable part of system design.

[0004] The widespread availability of evacuation devices will help improve the ability of these vehicles to respond to emergencies. Traditional evacuation methods typically involve manual evacuation ladders. However, due to limitations in the number of evacuation ladders, this method may not be efficient or safe enough. Evacuation devices located at the bottom of the vehicle have emerged as an innovative solution. This device allows passengers to quickly evacuate to the ground or a lower evacuation platform via the passenger compartment doors on the side of the vehicle in an emergency, thereby improving evacuation efficiency and safety.

[0005] Evacuation ladders are primarily used for lateral or frontal evacuation and are suitable for scenarios with significant height differences between the vehicle body and the ground. They feature a folding design, allowing them to be stored under or on the side of the vehicle, saving space. Some units are equipped with drive components (such as cylinders or motors) to enable automatic deployment and retraction of the ladder. For different height differences, adjustable-step evacuation ladders are designed to enhance adaptability.

[0006] However, existing evacuation ladders rely on skirt panels to lock the ladder assembly after being retracted. Therefore, the locking method and performance of the skirt panels are crucial to the stability of the train during normal operation. Currently, most skirt panel locking relies on rotary cylinders. When the skirt panel is retracted into place, the rotary cylinder is driven to rotate and hook the skirt panel. However, since the rotary cylinder itself is a linear piston motion converted into rotational motion through a screw structure, there is a risk that the skirt panel's gravity will cause it to crack after locking, or that the entire unit will fall down after deflating.

[0007] Therefore, it is necessary to design a more stable and secure locking device for the existing evacuation ladder skirts. Utility Model Content

[0008] The purpose of this invention is to provide a train evacuation ladder locking device based on a ratchet reset self-locking structure, which provides a more reliable lock, can achieve automatic locking, and can be pneumatically or manually unlocked, thus significantly improving the safety performance and operating efficiency of the evacuation device.

[0009] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a train evacuation ladder locking device based on a ratchet reset self-locking structure, comprising: a mounting plate, a limit locking fork, a limit pawl, and an unlocking drive mechanism;

[0010] The unlocking drive mechanism includes a relatively movable mounting base and an unlocking part. The mounting base is fixedly connected to the mounting plate, and a self-resetting locking structure is connected between the mounting base and the unlocking part.

[0011] The limiting pawl includes a mounting end, an actuating end, and a driving end, and the driving end is rotatably connected to the unlocking part.

[0012] The limiting lock fork includes a lock fork notch, a self-locking step, and a mounting part. The self-resetting unlocking structure is connected between the limiting lock fork and the mounting plate.

[0013] The mounting part and the mounting end are respectively rotatably connected to the mounting plate;

[0014] When unlocked under no-load conditions, in response to the unlocking action issued by the unlocking part, the actuating end is driven to disengage from the self-locking step, and the locking fork notch moves to the unlocking position under the reset action of the self-resetting unlocking structure.

[0015] When locked, in response to the locking action of the external skirt assembly, the locking fork notch is moved to the locked position, and the actuating end is connected to the self-locking step limit under the reset action of the self-resetting locking structure.

[0016] As a preferred technical solution of this utility model, the limiting lock fork is equipped with a rotation stroke limiting structure. The rotation stroke limiting structure includes a positioning post and an arc-shaped limiting hole that penetrates the body of the limiting lock fork. The end of the positioning post is fixedly connected to the mounting plate, and the post body of the positioning post passes through the arc-shaped limiting hole. When the positioning post is located at both ends of the arc-shaped limiting hole, the notch of the lock fork is located in the unlocked position and the locked position, respectively.

[0017] As a preferred technical solution of this utility model, it also includes a locking position switch, which is provided with a switch base and a switch trigger rod. The switch base is fixedly connected to the mounting plate, and the switch trigger rod is movably connected to the switch base. A drop trigger step is provided on the outer side of the limiting pawl. The drop trigger step corresponds to the position of the switch trigger rod and is in contact with it. During the unlocking or locking action, the limiting pawl moves, causing the drop trigger step to move and move the position of the switch trigger rod. The locking position switch identifies the locking or unlocking state by the change in the position of the switch trigger rod.

[0018] As a preferred technical solution of this utility model, the unlocking drive mechanism includes a pneumatic unlocking mechanism, the pneumatic unlocking mechanism includes a one-way extension cylinder, and the self-resetting locking structure includes a pneumatic unlocking and resetting tension spring disposed inside the one-way extension cylinder.

[0019] The fixed part of the one-way extension cylinder is fixedly connected to the mounting plate, and the extension part of the one-way extension cylinder is rotatably connected to the driving end of the limiting pawl. The pneumatic unlocking and reset spring is used to continuously apply a pulling force to the extension part of the one-way extension cylinder in the direction of moving towards the fixed part of the one-way extension cylinder.

[0020] As a preferred technical solution of this utility model, the unlocking drive mechanism further includes a manual unlocking mechanism, which includes: an unlocking pull rope, an unlocking pull rod, and an unlocking lever; the self-resetting locking structure further includes a manual unlocking and resetting compression spring.

[0021] The top end of the manual unlocking and resetting spring is fixedly connected to the mounting plate. The top end of the unlocking lever is fixedly connected to the bottom end of the manual unlocking and resetting spring and the bottom end of the unlocking rope, respectively. The bottom end of the unlocking lever is rotatably connected to one end of the unlocking lever. The other end of the unlocking lever is rotatably connected to the driving end. The fulcrum of the unlocking lever is set at the mounting end.

[0022] As a preferred embodiment of this utility model, the self-resetting locking structure is used to continuously apply a force to the unlocking part to move towards the locked state; the self-resetting unlocking structure is used to continuously apply a force to the limiting lock fork to move towards the unlocked state.

[0023] As a preferred technical solution of this utility model, the self-resetting unlocking structure is a reset torsion spring.

[0024] As a preferred embodiment of this utility model, the mounting plate is equipped with a protective cover, and the bottom of the protective cover is provided with a locking fork opening, the locking fork notch extending out of the locking fork opening.

[0025] In summary, this utility model has the following beneficial effects: When the evacuation ladder is retracted, the skirt panel assembly enters the locking fork opening and moves from the unlocked position to the locked position, driving the limit locking fork to rotate and allowing the self-locking step to move to the self-locking position. Simultaneously, under the action of the self-resetting locking structure, the action end of the limit pawl moves to the self-locking position, forming a limit connection with the self-locking step, thus achieving the retraction of the evacuation ladder into place. The entire locking process is achieved through mechanical structure cooperation, allowing for automatic internal locking, ensuring stability and reliability, and eliminating the risk of failure to lock or gaps caused by existing cylinder drives. When unlocking is required, only the unlocking part of the unlocking drive mechanism needs to be activated to disengage the limit pawl from the self-locking step, releasing the position lock of the limit locking fork and releasing the skirt panel assembly. At this time, the release and movement of the skirt panel assembly drives the limit locking fork to rotate and shift, causing the locking fork notch to move from the locked position to the unlocked position, completing the unlocking. The entire unlocking operation is simple and convenient, making it more conducive to the actual control and use of evacuation ladders on intercity trains.

[0026] This invention solves the problem that the skirt panels of evacuation devices in the rail transit industry are prone to cracking when locked and cannot maintain the lock after air loss. Compared with the rotary cylinder locking solution, the locking solution of this invention is more reliable and can achieve automatic locking and pneumatic or manual unlocking, which can significantly improve the safety performance and operating efficiency of evacuation devices. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the device in the locked state of this utility model;

[0028] Figure 2 This is a schematic diagram of the unlocked state of the device of this utility model;

[0029] Figure 3 This is a schematic diagram showing the movement direction of each component when the device of this utility model changes from the locked state to the unlocked state;

[0030] Figure 4 This is a schematic diagram showing the movement direction of each component when the device of this utility model changes from the unlocked state to the locked state.

[0031] In the picture:

[0032] 1. Mounting plate; 11. Protective cover; 2. Limiting lock fork; 21. Lock fork notch; 22. Self-locking step; 23. Mounting part; 24. Positioning post; 25. Arc-shaped limiting hole; 3. Limiting pawl; 31. Mounting end; 32. Actuating end; 33. Driving end; 34. Drop trigger step; 4. One-way extension cylinder; 41. Unlocking pull rope; 42. Unlocking pull rod; 43. Unlocking lever; 6. Manual unlocking reset spring; 7. Reset torsion spring; 8. Switch base; 81. Switch trigger rod. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] like Figure 1 and 2 As shown, this utility model provides a train evacuation ladder locking device based on a ratchet reset self-locking structure, including: a mounting plate 1, a limiting lock fork 2, a limiting pawl 3, and an unlocking drive mechanism;

[0035] The unlocking drive mechanism includes a relatively movable mounting base and an unlocking part. The mounting base is fixedly connected to the mounting plate 1, and a self-resetting locking structure is connected between the mounting base and the unlocking part. The self-resetting locking structure is used to continuously apply a force to the unlocking part to move it to the locked state.

[0036] In the unlocking drive mechanism, a mounting base is used to fix the mechanism in place on the mounting plate 1, and a movable unlocking part is used to initiate the unlocking action. It also works in conjunction with a self-resetting locking structure to continuously apply a force to the unlocking part to return it to its original position, that is, to move it towards the locked state, thereby achieving automatic reset of the unlocking drive mechanism.

[0037] The limiting pawl 3 includes an installation end 31, an action end 32, and a drive end 33. The drive end 33 is rotatably connected to the unlocking part. The entire limiting pawl 3 is approximately obtuse-angled sector-shaped. The installation end 31 is located at the center of the obtuse-angled sector. The limiting pawl 3 can rotate around the installation end 31 as the center. The installation end 31 is rotatably connected to the mounting plate 1. The action end 32 and the drive end 33 are located at the two ends of the arc edge of the obtuse-angled sector, respectively. Since the position of the installation end 31 remains unchanged, it can only rotate. Therefore, when the unlocking part is activated, it will drive the drive end 33 to move, so that the entire limiting pawl 3 forms a lever, causing the action end 32 to perform an action opposite to the action of the unlocking part, thereby enabling the limiting lock step 22 of the limiting lock fork 2 to perform a corresponding limiting self-locking action or a disengaging unlocking action.

[0038] The limiting lock fork 2 includes a lock fork notch 21, a self-locking step 22, and a mounting part 23, which is rotatably connected to the mounting plate 1. A self-resetting unlocking structure is connected between the limiting lock fork 2 and the mounting plate 1. The self-resetting unlocking structure is used to continuously apply a force to the limiting lock fork 2 to move towards the unlocked state. Specifically, the self-resetting unlocking structure is a reset torsion spring 7.

[0039] The limiting locking fork 2 has an irregular shape. The mounting part 23 is located in the middle, which is the rotation center of the limiting locking fork 2. The bottom end of the fork is provided with a locking fork notch 21. The return torsion spring 7 is connected between the mounting plate 1 and the limiting locking fork 2, and is used to continuously apply a force to the locking fork notch 21 to keep it in the unlocked position. The outer edge of the limiting locking fork 2 is provided with a self-locking step 22. There is a height difference on both sides of the self-locking step 22, and the self-locking step 22 has an included angle that matches the action end 32. The included angle and the shape of the action end 32 match, so that when the action end 32 is engaged with the self-locking step 22, it can only move in one direction. When the locking fork notch 21 is in the locked position, the self-locking step 22 and the action end 32 are locked together, realizing the position locking of the evacuation ladder.

[0040] When unlocked under no-load conditions, in response to the unlocking action issued by the unlocking part, the driving end 32 disengages from the self-locking step 22, and the locking fork notch 21 moves to the unlocking position under the reset action of the self-resetting unlocking structure.

[0041] It should be noted that when the locking device of this utility model is in the locked state of the skirt assembly, that is, when the locking fork notch 21 has already limited and locked the skirt assembly, if the unlocking part issues an unlocking action, the driving end 32 will disengage from the self-locking step 22. However, at this time, the locking fork notch 21 will not move directly to the unlocking position under the reset action of the self-resetting unlocking structure, because the skirt assembly has not yet moved. The self-resetting unlocking structure only provides a force to the locking fork notch 21 to move in the direction of the unlocking position, and cannot directly drive the limiting locking fork 2. Only when unloaded can its force drive the limiting locking fork 2.

[0042] Furthermore, the limit lock fork 2 will rotate and the lock fork notch 21 will move to the unlock position when the skirt assembly is released at the same time as the unlocking.

[0043] When locked, in response to the locking action issued by the external skirt assembly, the skirt assembly moves into the locking fork notch 21, causing the locking fork notch 21 to move to the locked position. The action end 32 is limited and connected to the self-locking step 22 under the reset action of the self-resetting locking structure.

[0044] Specifically, the limiting fork 2 is equipped with a rotational travel limiting structure, which includes a positioning post 24 and an arc-shaped limiting hole 25 penetrating the body of the limiting fork 2. The end of the positioning post 24 is fixedly connected to the mounting plate 1, and the post body of the positioning post 24 passes through the arc-shaped limiting hole 25. When the positioning post 24 is located at both ends of the arc-shaped limiting hole 25, the locking fork notch 21 is located in the unlocked position and the locked position, respectively. That is, the rotation range of the entire limiting fork 2 is limited by the positions of both ends of the arc-shaped limiting hole 25. With the help of the return torsion spring 7, the locking fork notch 21 can only move within the range between the unlocked position and the locked position.

[0045] The operation of the evacuation ladder locking device of this utility model is as follows: the locking fork notch 21 of the limiting locking fork 2 acts on the skirt panel assembly on the evacuation ladder. When it is in the unlocked position, the skirt panel is released, and the evacuation ladder can be released. When the evacuation ladder is retracted, it drives the skirt panel to engage with the locking fork notch 21, and at the same time moves the locking fork notch 21 to the locked position. At this time, the locking device automatically locks to fix the position of the skirt panel, ensuring that the evacuation ladder remains in the retracted state.

[0046] When the evacuation ladder needs to be unlocked or released, the unlocking part of the unlocking drive mechanism is controlled to issue an unlocking action. At the same time, the skirt panel assembly is driven to move, and the drive end 33 of the limit pawl 3 is activated. Since the mounting end 31 is rotatably connected to the mounting plate 1, it can only rotate. The action end 32 of the limit pawl 3 will also move along an arc trajectory, disengaging from the self-locking position of the self-locking step 22 of the limit locking fork 2. At this time, the limit locking fork 2 is released, and the mounting part 23 of the limit locking fork 2 can only rotate. Under the reset action of the self-resetting unlocking structure and the drive of the skirt panel assembly's unfolding action, the limit locking fork 2 rotates, causing the locking fork notch 21 to move from the locked position to the unlocked position. At this time, the skirt panel is released, and the evacuation ladder can be released.

[0047] When the evacuation ladder needs to be locked and retracted, the evacuation ladder is retracted, causing the skirt plate to move into the unlocked position of the limit locking fork 2 to the locking fork notch 21. As the evacuation ladder retracts, the skirt plate and the locking fork notch 21 move to the locking position of the locking fork notch 21. At the same time, the self-locking step 22 of the limit locking fork 2 also moves to the self-locking position. At this time, the action end 32 of the limit pawl 3 is released and rotates under the reset action of the self-resetting locking structure. The action end 32 will automatically rotate to the self-locking position and make a limit abutment connection with the self-locking step 22. The unlocking part will also return to the original position on the unlocking drive mechanism. At this time, under the limit connection action of the self-locking step 22 and the action end 32, the entire train evacuation ladder locking device is kept in a locked state.

[0048] The advantages of this train evacuation ladder locking device are as follows: When the evacuation ladder is retracted, the skirt plate enters the locking fork opening and moves from the unlocked position to the locked position, causing the limiting locking fork 2 to rotate, allowing the self-locking step 22 to move to the self-locking position. Simultaneously, under the action of the self-resetting locking structure, the action end 32 of the limiting pawl 3 moves to the self-locking position, forming a limiting connection with the self-locking step 22, thus achieving the complete retraction of the evacuation ladder. The entire locking process is achieved through mechanical coordination, allowing for automatic internal locking, ensuring stability and reliability. It eliminates the risk of failure to lock or gaps caused by existing cylinder drives. When unlocking is required, simply activate the unlocking part of the unlocking drive mechanism to disengage the limit pawl 3 from the self-locking step 22, releasing the position lock of the limit fork 2, thus releasing the lock on the skirt assembly. If the skirt assembly is then driven to unfold, the limit fork 2 can rotate and shift, causing the fork notch 21 to move from the locked position to the unlocked position, completing the unlocking process. The entire unlocking operation is simple and convenient, making it more conducive to the actual use of evacuation stairs in intercity trains.

[0049] This invention solves the problem that the skirt panels of evacuation devices in the rail transit industry are prone to cracking when locked and cannot maintain the lock after air loss. Compared with the rotary cylinder locking scheme, the locking of this invention is more reliable and can achieve automatic locking and pneumatic or manual unlocking, which can significantly improve the safety performance and operating efficiency of evacuation devices.

[0050] As a preferred technical solution of this utility model, it also includes a locking position switch, which is provided with a switch base 8 and a switch trigger rod 81. The switch base 8 is fixedly connected to the mounting plate 1, and the switch trigger rod 81 is movably connected to the switch base 8. A drop trigger step 34 is provided on the outer side of the limiting pawl 3. The drop trigger step 34 corresponds to and contacts the switch trigger rod 81. During the unlocking or locking action, the limiting pawl 3 moves, which drives the drop trigger step 34 to move, thereby moving the position of the switch trigger rod 81. The locking position switch identifies the locking or unlocking state by the change in the position of the switch trigger rod 81.

[0051] Specifically, such as Figure 1 As shown, the switch base 8 is installed above the limit pawl 3, and the switch trigger rod 81 is located at the bottom of the switch base 8 and is slidably connected to the bottom of the switch base 8. When the bottom end of the switch trigger rod 81 extends, the electrical components inside the switch base 8 are triggered, which is recorded as locking in place. When the bottom end of the switch trigger rod 81 retracts, the electrical components inside the switch base 8 are triggered in the reverse direction, which is recorded as unlocking, and a corresponding electrical signal is sent to the management terminal to facilitate the actual management and control of the evacuation elevator.

[0052] The locking position switch is an electrical signal switch. When the entire locking device switches between the unlocked and locked states, the limit pawl 3 will also rotate, causing the drop trigger step 34 to move, thereby moving the switch trigger rod 81. The state of the evacuation ladder is determined based on the state of the switch trigger rod 81.

[0053] As an embodiment of this utility model, the unlocking drive mechanism includes a pneumatic unlocking mechanism, which includes a one-way extension cylinder 4, and the self-resetting locking structure includes a pneumatic unlocking and resetting tension spring disposed inside the one-way extension cylinder 4.

[0054] The fixed part of the one-way extension cylinder 4 is fixedly connected to the mounting plate 1, and the extension part of the one-way extension cylinder 4 is rotatably connected to the drive end 33 of the limiting pawl 3. The pneumatic unlocking and reset spring is used to continuously apply a pulling force to the extension part of the one-way extension cylinder 4 in the direction of the fixed part of the one-way extension cylinder 4. When unlocking is required, the one-way extension cylinder 4 is controlled to extend the extension part and trigger the unlocking action. During the locking operation, the pneumatic unlocking and reset spring resets, driving the extension part back to its original position, waiting for the next unlocking control.

[0055] Furthermore, the unlocking drive mechanism also includes a manual unlocking mechanism, which includes: an unlocking pull rope 41, an unlocking pull rod 42, and an unlocking lever 43; the self-resetting locking structure also includes a manual unlocking reset spring 6;

[0056] The top end of the manual unlocking and reset spring 6 is fixedly connected to the mounting plate 1. The top end of the unlocking lever 42 is fixedly connected to the bottom end of the manual unlocking and reset spring 6 and the bottom end of the unlocking pull rope 41 respectively. The bottom end of the unlocking lever 42 is rotatably connected to one end of the unlocking lever 43. The other end of the unlocking lever 43 is rotatably connected to the drive end 33. The fulcrum of the unlocking lever 43 is set at the mounting end 31.

[0057] The manual unlocking mechanism can be installed simultaneously with the pneumatic unlocking mechanism. When unlocking is required, pulling out the unlocking rope 41 initiates the unlocking action, causing the unlocking lever 42 to rise. Under the leverage of the unlocking lever 43, the driving end 33 of the limit pawl 3 moves downward and rotates, disengaging the acting end 32 of the limit pawl 3 from its self-locking position, thus unlocking. During locking operations, the manual unlocking reset spring 6 resets, causing the unlocking rope 41 and unlocking lever 42 to return to their original positions, awaiting the next unlocking control.

[0058] In this embodiment, as Figure 3As indicated by the direction of movement arrow, the unlocking process is as follows: the one-way extension cylinder 4 pushes downward, causing the limiting pawl 3 to rotate in the direction of disengaging from the self-locking step 22; or the unlocking rope 41 is manually pulled, causing the unlocking lever 42 and unlocking lever 43 to rotate simultaneously, causing the limiting pawl 3 to rotate in the direction of disengaging from the self-locking step 22, and triggering the locking position limit switch at the same time. At this time, since the limiting pawl 3 has disengaged from the self-locking position, the path of the locking fork notch 21 rotating in the unlocking direction is no longer constrained, and the skirt can be unlocked. At the same time, the return torsion spring 7 also applies a force to the limiting locking fork 2 in the unlocking direction. The limiting locking fork 2 itself also has a limit post to constrain its stroke, which can ensure that after the locking hook of the skirt disengages from the locking fork notch 21, the locking fork notch 21 always remains in the unlocked position, ready for the next locking action.

[0059] like Figure 4 As indicated by the direction of movement arrow, the locked state is as follows: the locking hook of the skirt plate strikes the locking fork notch 21, causing the locking fork notch 21 to rotate in the direction of the locked position. When the skirt plate reaches the locked position, the self-locking step 22 of the limiting locking fork 2 aligns with the action end 32 of the limiting pawl 3. Under the action of the manual unlocking reset spring 6 and the pneumatic unlocking reset tension spring, the limiting pawl 3 rotates in the direction of entering the self-locking position and locks, and simultaneously releases the locking position switch. At this time, the limiting locking fork 2 is completely locked by the limiting pawl 3 and cannot move in the unlocking direction, thus realizing the automatic locking function.

[0060] As a preferred technical solution of this utility model, the mounting plate 1 is equipped with a protective cover 11. The bottom of the protective cover 11 is provided with a locking fork opening, and the locking fork notch 21 extends out of the locking fork opening. All other mechanical parts are arranged between the mounting plate 1 and the protective cover 11. The cooperation between the mounting plate 1 and the protective cover 11 is not only used for the installation of other internal mechanical structures, but also for the protection and isolation of other internal structures.

[0061] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A train evacuation ladder locking device based on a ratchet reset self-locking structure, characterized in that: include: Mounting plate (1), limit locking fork (2), limit pawl (3), unlocking drive mechanism; The unlocking drive mechanism includes a relatively movable mounting base and an unlocking part. The mounting base is fixedly connected to the mounting plate (1), and a self-resetting locking structure is connected between the mounting base and the unlocking part. The limiting pawl (3) includes an installation end (31), an action end (32) and a drive end (33), and the drive end (33) is rotatably connected to the unlocking part; The limiting lock fork (2) includes a lock fork notch (21), a self-locking step (22), and a mounting part (23). A self-resetting unlocking structure is connected between the limiting lock fork (2) and the mounting plate (1). The mounting part (23) and the mounting end (31) are respectively rotatably connected to the mounting plate (1); When unlocked under no-load conditions, in response to the unlocking action issued by the unlocking part, the action end (32) is driven to disengage from the self-locking step (22), and the locking fork notch (21) moves to the unlocking position under the reset action of the self-resetting unlocking structure; When locked, in response to the locking action of the external skirt assembly, the locking fork notch (21) is moved to the locked position, and the action end (32) is limited and connected to the self-locking step (22) under the reset action of the self-resetting locking structure.

2. The train evacuation ladder locking device based on a ratchet reset self-locking structure according to claim 1, characterized in that: The limiting lock fork (2) is equipped with a rotation stroke limiting structure, which includes a positioning post (24) and an arc-shaped limiting hole (25) that passes through the body of the limiting lock fork (2). The end of the positioning post (24) is fixedly connected to the mounting plate (1), and the post body of the positioning post (24) passes through the arc-shaped limiting hole (25). When the positioning post (24) is located at both ends of the arc-shaped limiting hole (25), the lock fork notch (21) is located in the unlocked position and the locked position, respectively.

3. The train evacuation ladder locking device based on a ratchet reset self-locking structure according to claim 1, characterized in that: It also includes a locking position switch, which is provided with a switch base (8) and a switch trigger rod (81). The switch base (8) is fixedly connected to the mounting plate (1), and the switch trigger rod (81) is movably connected to the switch base (8). A drop trigger step (34) is provided on the outside of the limiting pawl (3). The drop trigger step (34) corresponds to the position of the switch trigger rod (81) and is in contact with each other. During the unlocking or locking action, the limiting pawl (3) moves, which drives the drop trigger step (34) to move and move the position of the switch trigger rod (81). The locking position switch identifies the locking or unlocking state by the position change of the switch trigger rod (81).

4. The train evacuation ladder locking device based on a ratchet reset self-locking structure according to claim 1, characterized in that: The unlocking drive mechanism includes a pneumatic unlocking mechanism, which includes a one-way extension cylinder (4). The self-resetting locking structure includes a pneumatic unlocking and resetting tension spring disposed inside the one-way extension cylinder. The fixed part of the one-way extension cylinder (4) is fixedly connected to the mounting plate (1), and the extension part of the one-way extension cylinder (4) is rotatably connected to the driving end (33) of the limiting pawl (3). The pneumatic unlocking and reset spring is used to continuously apply a pulling force to the extension part of the one-way extension cylinder (4) in the direction of moving towards the fixed part of the one-way extension cylinder (4).

5. A train evacuation ladder locking device based on a ratchet reset self-locking structure according to claim 4, characterized in that: The unlocking drive mechanism also includes a manual unlocking mechanism, which includes: an unlocking pull rope (41), an unlocking pull rod (42), and an unlocking lever (43); the self-resetting locking structure also includes a manual unlocking reset spring (6); The top end of the manual unlocking and resetting spring (6) is fixedly connected to the mounting plate (1), the top end of the unlocking lever (42) is fixedly connected to the bottom end of the manual unlocking and resetting spring (6) and the bottom end of the unlocking pull rope (41) respectively, the bottom end of the unlocking lever (42) is rotatably connected to one end of the unlocking lever (43), the other end of the unlocking lever (43) is rotatably connected to the driving end (33), and the fulcrum of the unlocking lever (43) is set at the mounting end (31).

6. A train evacuation ladder locking device based on a ratchet reset self-locking structure according to claim 1, characterized in that: The self-resetting locking structure is used to continuously apply a force to the unlocking part to move towards the locked state; the self-resetting unlocking structure is used to continuously apply a force to the limiting lock fork (2) to move towards the unlocked state.

7. A train evacuation ladder locking device based on a ratchet reset self-locking structure according to claim 1, characterized in that: The self-resetting unlocking structure is a reset torsion spring (7).

8. A train evacuation ladder locking device based on a ratchet reset self-locking structure according to claim 1, characterized in that: The mounting plate (1) is equipped with a protective cover (11), and the bottom of the protective cover (11) is provided with a locking fork opening, and the locking fork notch (21) extends out of the locking fork opening.

Images