A double-leaf sliding door system and a lower restraint device thereof

Abstract

The application discloses a double-leaf sliding door system and a lower constraint device thereof, and relates to the technical field of railway vehicles.The lower constraint device comprises a constraint execution device, a left lock fork, a right lock fork, a left ratchet wheel located below a left lower blocking pin, a left ratchet wheel shaft penetratingly connecting the left lock fork and the left ratchet wheel, a left pawl matched with the left ratchet wheel shaft, a left unlocking torsional spring, a right ratchet wheel located below a right lower blocking pin, a right ratchet wheel shaft penetratingly connecting the right lock fork and the right ratchet wheel, a right pawl matched with the right ratchet wheel, and a right unlocking torsional spring; the left lock fork and the right lock fork are arranged in the box body; the action normal stress of the left ratchet wheel and the left pawl is directed to the center of the left pawl; and the action normal stress of the right ratchet wheel and the right pawl is directed to the center of the right ratchet wheel; and a power assembly is connected with the left pawl and the right pawl respectively to drive the left pawl and the right pawl to rotate.The device can increase rigid constraint at the lower part of the door leaf to improve the sound insulation performance of the door system when the vehicle appears in a negative pressure working condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail vehicle technology, and more particularly, to a lower restraint device. In addition, it also relates to a double-leaf sliding plug door system comprising the above lower restraint device. BACKGROUND

[0002] In the related art, most of the passenger compartment side doors of rail vehicles use double-leaf electric sliding plug doors. Generally, the double-leaf passenger compartment sliding plug door is provided with a multi-point restraint device, which has good sealing performance and sound insulation performance under static working conditions. However, when the rail vehicle is in motion, especially when it is entering or passing through a tunnel, the double-leaf passenger compartment sliding plug door system on the vehicle may have a gap in the middle and lower part of the door leaf due to the difference between the internal and external air pressures, which may cause a sharp decrease in the sound insulation performance of the door leaf.

[0003] According to the analysis, the main bearing point of the double-leaf electric sliding plug door of the rail vehicle is in the upper part of the door leaf, and there is no reliable rigid restraint in the lower part. Generally, a lower stop pin is used as an auxiliary non-rigid restraint. The lower stop pin is located on the door leaf, and the block is located on the door sill. When the door leaf is locked, the transverse distance a between the lower stop pin and the block is 2-3 mm, as shown in the structure of Figure 1 Therefore, when the internal air pressure of the vehicle is greater than the external air pressure (hereinafter referred to as negative pressure), the middle and lower parts of the door leaf are elastically deformed in the outward direction under the influence of air pressure, thereby reducing the compression amount of the rubber strip or even causing a flash gap between the door leaf and the door sill, which becomes a significant sound leakage point.

[0004] In view of the above, how to increase the rigid restraint locking device in the lower part of the door leaf to improve the sound insulation performance of the door system when the vehicle is in a negative pressure working condition is a problem that needs to be solved by the technical personnel in the field. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a lower restraint device that can increase the rigid restraint in the lower part of the door leaf to improve the sound insulation performance of the door system when the vehicle is in a negative pressure working condition. Another purpose of the present application is to provide a double-leaf sliding plug door system comprising the above lower restraint device.

[0006] In order to achieve the above-mentioned purposes, the present application provides the following technical solutions:

[0007] A lower restraint device, comprising:

[0008] A constraint execution device includes a box body, a left lock fork for accommodating a left lower blocking pin, a right lock fork for accommodating a right lower blocking pin, a left ratchet wheel below the left lower blocking pin, a left ratchet wheel shaft penetratingly connecting the left lock fork and the left ratchet wheel, a left pawl arranged in cooperation with the left ratchet wheel shaft, a left unlocking torsional spring for driving the left pawl to reset, a right ratchet wheel below the right lower blocking pin, a right ratchet wheel shaft penetratingly connecting the right lock fork and the right ratchet wheel, a right pawl arranged in cooperation with the right ratchet wheel, and a right unlocking torsional spring for driving the right pawl to reset, the left lock fork and the right lock fork are arranged in the box body, the acting normal stress of the left ratchet wheel and the left pawl points to the center of the left pawl, and the acting normal stress of the right ratchet wheel and the right pawl points to the center of the right ratchet wheel.

[0009] A power assembly is connected with the left pawl and the right pawl respectively to drive the left pawl and the right pawl to rotate.

[0010] In an embodiment, the power assembly includes a left electromagnet, a right electromagnet, a bottom plate, a left pull rod, a right pull rod, a left roller, and a right roller, the left roller is connected with the end of the left pawl, and the right roller is connected with the end of the right pawl.

[0011] The left electromagnet and the right electromagnet are fixedly arranged on the bottom plate, one end of the left pull rod is rotationally connected with the left electromagnet, the other end is rotationally connected with the left roller, one end of the right pull rod is rotationally connected with the right electromagnet, and the other end is rotationally connected with the right roller.

[0012] In an embodiment, two ends of the box body are respectively provided with a left height adjusting device and a right height adjusting device, and the left height adjusting device and the right height adjusting device are used to press the power assembly on a vehicle body.

[0013] In an embodiment, a cover plate is detachably arranged on the top of the box body.

[0014] In an embodiment, an emergency unlocking device is further included for unlocking the left ratchet wheel and the right ratchet wheel in an emergency.

[0015] In an embodiment, the emergency unlocking device includes a left unlocking rod, a right unlocking rod, an emergency unlocking steel wire rope assembly, a left transmission pin arranged at one end of the left unlocking rod, and a right transmission pin arranged at one end of the right unlocking rod.

[0016] The left transmission pin is connected with the left pull rod, the right transmission pin is connected with the right pull rod, and the other end of the left unlocking rod and the other end of the right unlocking rod are provided with a steel wire rope of the emergency unlocking steel wire rope assembly.

[0017] In one embodiment, the left lock fork is provided with a left accommodating groove for accommodating the left lower blocking pin, and the left lock fork is provided with a right accommodating groove for accommodating the right lock fork.

[0018] A left reset torsion spring is arranged in the left accommodating groove to drive the left unlocking lever to reset, and a right reset torsion spring is arranged in the right accommodating groove to drive the right unlocking lever to reset.

[0019] A double-leaf sliding plug door system comprising the lower restraint device.

[0020] In one embodiment, the lower restraint device further comprises a door leaf, a driving mechanism for driving the door leaf to open and close, a swing arm arranged between the driving mechanism and the door leaf, and a door sill arranged at the bottom of the door leaf, wherein the restraint execution device of the lower restraint device is fixedly connected with the door sill.

[0021] In use of the lower restraint device, the left lower blocking pin and the right lower blocking pin are fixedly connected below the door leaf, the bottom of the left lower blocking pin is substantially flush with the lower plane of the left lock fork, and the bottom of the right lower blocking pin is substantially flush with the lower plane of the right lock fork. When closing the door, the door leaf moves inwards at a certain angle, at this time, the left lower blocking pin and the right lower blocking pin move towards each other, push the side walls of the left lock fork and the right lock fork, and drive the ratchet wheel and the right ratchet wheel to rotate to a certain position.

[0022] When the double-leaf sliding plug door system is locked, the power assembly operates to drive the left pawl and the right pawl to rotate circumferentially, so that the left pawl abuts against the tooth portion of the left ratchet wheel to achieve locking, and the right pawl abuts against the tooth portion of the right ratchet wheel to achieve locking, and the acting normal stress of the left ratchet wheel and the left pawl is directed to the center of the left pawl, so that reliable self-locking can be achieved, the acting normal stress of the right ratchet wheel and the right pawl is directed to the center of the right pawl, so that reliable self-locking can be achieved, and the door leaf is effectively closed.

[0023] When unlocking is needed, the power assembly can be controlled to stop operating, the left pawl reversely rotates and resets under the action of the left unlocking torsion spring, the left pawl is disengaged from the tooth portion of the left ratchet wheel, the left lock fork rotates under the pushing of the left lower blocking pin of the door leaf and returns to the initial position, the right pawl reversely rotates and resets under the action of the right unlocking torsion spring, the right pawl is disengaged from the tooth portion of the right ratchet wheel, the right lock fork rotates under the pushing of the right lower blocking pin of the door leaf and returns to the initial position, so as to complete the unlocking operation and facilitate opening of the door leaf.

[0024] The device is a locking device arranged in the lower part of the door leaf of a double-leaf electric sliding plug door system, which is used for reliably restraining the middle and lower parts of the door leaf to pass the dead point, reducing deformation of the lower part of the door leaf in case of negative pressure or passenger extrusion during vehicle movement, thereby reducing the occurrence of sound leakage of the lower part of the double-leaf electric sliding plug door and improving the sound insulation performance of the door system in the vehicle movement state.

[0025] In summary, the lower constraint device provided by the present application can increase the rigidity constraint at the lower part of the door leaf, so as to improve the sound insulation performance of the door system when the vehicle is in a negative pressure working condition.

[0026] In addition, the present application also provides a double-leaf sliding door system comprising the above-mentioned lower constraint device. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the provided drawings.

[0028] Figure 1 It is a partial schematic view of the lower blocking pin and the embedded block of the conventional double-leaf sliding door;

[0029] Figure 2 It is a schematic view of the installation of the lower constraint device provided by the present application on the door sill;

[0030] Figure 3 It is a schematic view of the structure of the lower constraint device;

[0031] Figure 4 It is a top view of the lower constraint device;

[0032] Figure 5 It is a partial schematic view of the power device;

[0033] Figure 6 It is a schematic view of the action normal stress of the left ratchet wheel and the left pawl in the locked state;

[0034] Figure 7 It is a partial schematic view of the power assembly;

[0035] Figure 8 It is a partial structural schematic view of the emergency unlocking device.

[0036] Figure 1 In the figure:

[0037] 01 is an embedded block, 02 is a door sill, 03 is a lower blocking pin, and a is the transverse distance between the lower blocking pin and the embedded block;

[0038] Figures 2-8 In the figure:

[0039] 1 is lower restraint device, 2 is door sill, 3 is restraint execution device, 301 is cover plate, 302 is box body, 303 is left height adjustment device, 304 is right height adjustment device, 305 is left lock fork, 306 is right lock fork, 307 is left ratchet wheel, 308 is left ratchet wheel shaft, 309 is left unlocking torsional spring, 310 is left pawl, 311 is left unlocking rod, 312 is right unlocking rod, 313 is emergency unlocking steel wire rope assembly, 314 is left reset torsional spring, 315 is right reset torsional spring;

[0040] 4 is power assembly, 401 is left electromagnet, 402 is right electromagnet, 403 is left transmission pin, 404 is right transmission pin, 405 is bottom plate, 406 is left pull rod, 407 is right pull rod, 408 is left roller, 409 is right roller;

[0041] 5 is left lower blocking pin, 6 is right lower blocking pin, 7 is vehicle body, 8 is emergency unlocking device. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] The core of the present application is to provide a lower restraint device which can increase rigid restraint at the lower part of the door leaf to improve the sound insulation performance of the door system when the vehicle is in a negative pressure working condition. Another core of the present application is to provide a double-leaf sliding door system comprising the above-mentioned lower restraint device.

[0044] Please refer to Figures 2 to 8 , Figure 2 the installation schematic view of the lower restraint device provided by the present application on the door sill; Figure 3 the structural schematic view of the lower restraint device; Figure 4 the top view of the lower restraint device; Figure 5 the partial schematic view of the power device; Figure 6 the schematic view of the acting normal stress of the left ratchet wheel and the left pawl in the locked state; Figure 7 the partial schematic view of the power assembly; Figure 8 the partial structural schematic view of the emergency unlocking device.

[0045] The specific embodiment provides a lower restraint device 1, comprising:

[0046] The constraint execution device 3 comprises a box body 302, a left lock fork 305 for accommodating the left lower blocking pin 5, a right lock fork 306 for accommodating the right lower blocking pin 6, a left ratchet wheel 307 located below the left lower blocking pin 5, a left ratchet wheel shaft 308 penetratingly connecting the left lock fork 305 and the left ratchet wheel 307, a left pawl 310 arranged in cooperation with the left ratchet wheel shaft 308, a left unlocking torsional spring 309 for driving the left pawl 310 to reset, a right ratchet wheel located below the right lower blocking pin 6, a right ratchet wheel shaft penetratingly connecting the right lock fork 306 and the right ratchet wheel, a right pawl arranged in cooperation with the right ratchet wheel, and a right unlocking torsional spring for driving the right pawl to reset, the left lock fork 305 and the right lock fork 306 are arranged in the box body 302, the action normal stress of the left ratchet wheel 307 and the left pawl 310 is directed to the center of the left pawl 310, and the action normal stress of the right ratchet wheel and the right pawl is directed to the center of the right pawl.

[0047] The power assembly 4 is connected with the left pawl 310 and the right pawl respectively to drive the left pawl 310 and the right pawl to rotate.

[0048] It should be noted that the lower constraint device 1 for improving the sound insulation performance of the double-leaf sliding door can be installed on the door sill 2, the constraint execution device 3 of the lower constraint device 1 is fixedly connected with the door sill 2, and the constraint execution device 3 can effectively limit the movement of the left lower blocking pin 5 and the right lower blocking pin 6.

[0049] In actual application, the shape, structure, size, material, position, etc. of the constraint execution device 3 and the power assembly 4 can be determined according to actual conditions and actual needs.

[0050] When the lower constraint device 1 provided by the application is used, the left lower blocking pin 5 and the right lower blocking pin 6 are fixedly connected below the door leaf, the bottom of the left lower blocking pin 5 is basically flush with the lower plane of the left lock fork 305, and the bottom of the right lower blocking pin 6 is basically flush with the lower plane of the right lock fork 306. When closing the door, the door leaf moves into the vehicle along a certain angle, at this time, the left lower blocking pin 5 and the right lower blocking pin 6 move towards each other, push the side walls of the left lock fork 305 and the right lock fork 306, thereby driving the ratchet wheel 307 and the right ratchet wheel to rotate to a certain position.

[0051] When the double-leaf sliding door system is locked, the power assembly 4 operates to drive the left pawl 310 and the right pawl to rotate circumferentially, so that the left pawl 310 abuts against the tooth portion of the left ratchet wheel 307 to achieve locking, and the right pawl abuts against the tooth portion of the right ratchet wheel to achieve locking, and the action normal stress of the left ratchet wheel 307 and the left pawl 310 is directed to the center of the left pawl 310, which can achieve reliable self-locking, the action normal stress of the right ratchet wheel and the right pawl is directed to the center of the right pawl, which can achieve reliable self-locking, and the door leaf is effectively closed.

[0052] When the unlocking operation is needed, the power assembly 4 can be controlled to stop running, under the action of the left unlocking torsional spring 309, the left pawl 310 reversely rotates and resets, the left pawl 310 is disengaged from the tooth portion of the left ratchet wheel 307, the left lock fork 305 rotates under the pushing of the left lower blocking pin 5 of the door leaf and returns to the initial position, under the action of the right unlocking torsional spring, the right pawl reversely rotates and resets, the right pawl is disengaged from the tooth portion of the right ratchet wheel, the right lock fork 306 rotates under the pushing of the right lower blocking pin 6 of the door leaf and returns to the initial position, so that the unlocking operation is completed to facilitate opening of the door leaf.

[0053] The device is a locking device arranged in the middle and lower part of a double-opening electric plug door system door leaf, which is used for reliably restricting the over dead point of the middle and lower part of the door leaf, so that the deformation of the lower part of the door leaf is reduced in the case of negative pressure or passenger extrusion during vehicle movement, thereby reducing the occurrence of the lower part sound leakage of the double-opening electric plug door and improving the sound insulation performance of the door system in the vehicle movement state.

[0054] In summary, the lower part constraint device provided by the present application can increase the rigid constraint of the lower part of the door leaf to improve the sound insulation performance of the door system in the case of negative pressure of the vehicle.

[0055] In one embodiment, the power assembly 4 includes a left electromagnet 401, a right electromagnet 402, a bottom plate 405, a left pull rod 406, a right pull rod 407, a left roller 408 and a right roller 409, the left roller 408 and the end of the left pawl 310 are connected, and the right roller 409 and the end of the right pawl are connected; the left electromagnet 401 and the right electromagnet 402 are fixedly arranged on the bottom plate 405, one end of the left pull rod 406 is rotationally connected with the left electromagnet 401, the other end is rotationally connected with the left roller 408, one end of the right pull rod 407 is rotationally connected with the right electromagnet 402, and the other end is rotationally connected with the right roller 409.

[0056] It should be noted that when the double-opening plug door system is locked, the left electromagnet 401 is energized and attracted, the left pull rod 406 pulls back the left roller 408, the left roller 408 drives the left pawl 310 in the constraint execution device 3 to rotate clockwise to abut against the tooth portion of the left ratchet wheel 307 to achieve locking, the left ratchet wheel 307 and the left pawl 310 act on the normal stress pointing to the center of the left pawl 310 to achieve reliable self-locking. Similarly, the right electromagnet 402 is energized and attracted, the right pull rod 407 pulls back the right roller 409, the right roller 409 drives the right pawl in the constraint execution device 3 to rotate counterclockwise to abut against the tooth portion of the right ratchet wheel to achieve locking, the right ratchet wheel and the right pawl act on the normal stress pointing to the center of the right pawl to achieve reliable self-locking.

[0057] In one embodiment, the two ends of the box body 302 are respectively provided with a left height adjusting device 303 and a right height adjusting device 304, which are used to press the power assembly 4 on the vehicle body 7. That is, the execution device 3 presses the power assembly 4 on the vehicle body 7 through the left height adjusting device 303 and the right height adjusting device 304, so as to realize the load bearing of the entire lower restraint device 1.

[0058] In one embodiment, the top of the box body 302 is detachably provided with a cover plate 301.

[0059] It should be noted that when the door is closed, the door leaf moves into the vehicle at a certain angle, the left lower blocking pin 5 pushes the side wall of the left lock fork 305, thereby driving the left ratchet wheel 307 to rotate to a certain position, at this time, the transverse gap between the left lower blocking pin 5 and the cover plate 301 is the same as the transverse gap requirement of the conventional double-leaf sliding door. The right lower blocking pin 6 pushes the side wall of the right lock fork 306, thereby driving the right ratchet wheel to rotate to a certain position, at this time, the transverse gap between the right lower blocking pin 6 and the cover plate 301 is the same as the transverse gap requirement of the conventional double-leaf sliding door.

[0060] In one embodiment, it further includes an emergency unlocking device 8 for unlocking the left ratchet wheel 307 and the right ratchet wheel in an emergency. That is, when an emergency occurs and quick unlocking is needed, the emergency unlocking device 8 can be controlled to operate to quickly unlock the left ratchet wheel 307 and the right ratchet wheel.

[0061] In one embodiment, the emergency unlocking device 8 includes a left unlocking rod 311, a right unlocking rod 312, an emergency unlocking steel wire rope assembly 313, a left transmission pin 403 arranged at one end of the left unlocking rod 311, and a right transmission pin 404 arranged at one end of the right unlocking rod 312; the left transmission pin 403 is connected with a left pull rod 406, the right transmission pin 404 is connected with a right pull rod 407, and the other end of the left unlocking rod 311 and the other end of the right unlocking rod 312 are provided with a steel wire rope of the emergency unlocking steel wire rope assembly 313.

[0062] It should be noted that when emergency unlocking is needed, the operator can pull the emergency unlocking steel wire rope assembly 313 to the right under the action of the emergency unlocking device 8, and under the action of the steel wire rope, the left unlocking rod 311 rotates clockwise and the right unlocking rod 312 rotates counterclockwise. The left unlocking rod 311 drives the left pull rod 406 and the left roller 408 to move to the right by pushing the left transmission pin 403, thereby driving the left pawl 310 to rotate and making the left pawl 310 disengage from the tooth portion of the left ratchet wheel 307, so as to realize the emergency unlocking function.

[0063] At the same time, the right unlocking rod 312 drives the right pull rod 407 and the right roller 409 to move to the left by pushing the right transmission pin 404, thereby driving the right pawl to rotate and making the right pawl disengage from the tooth portion of the right ratchet wheel, so as to realize the emergency unlocking function.

[0064] In one embodiment, the left lock fork 305 is provided with a left accommodating groove for accommodating the left lower blocking pin 5, and the left lock fork 305 is provided with a right accommodating groove for accommodating the right lock fork 306; the left accommodating groove is provided with a left reset torsion spring 314 to drive the left unlocking lever 311 to reset, and the right accommodating groove is provided with a right reset torsion spring 315 to drive the right unlocking lever 312 to reset. That is, the left reset torsion spring 314 and the right reset torsion spring 315 are used to reset the left unlocking lever 311 and the right unlocking lever 312, so as to facilitate the next emergency unlocking operation.

[0065] It should be noted that, in the negative pressure working condition during driving, according to the above locking process, the Y-direction gap between the left accommodating groove and the left lower blocking pin 5 is not more than 1 mm, and the Y-direction gap between the right accommodating groove and the right lower blocking pin 6 is not more than 1 mm. Therefore, in the negative pressure working condition, the door leaf is pushed outward, the Y-direction movement of the left lower blocking pin 5 and the right lower blocking pin 6 is small, the sealing performance of the middle and lower parts of the door leaf is slightly affected, the sound leakage amount can be effectively reduced, and the sound insulation performance of the door system is improved.

[0066] In addition to the above-mentioned lower constraint device, the application also provides a double-opening sliding door system comprising the lower constraint device disclosed in the above embodiment, and the structures of other parts of the double-opening sliding door system refer to the prior art, which will not be described herein.

[0067] In one embodiment, the double-opening sliding door system further comprises a door leaf, a driving mechanism for driving the door leaf to open and close, a swing arm arranged between the driving mechanism and the door leaf, and a door sill 2 arranged at the bottom of the door leaf, and the constraint execution device 3 of the lower constraint device 1 is fixedly connected with the door sill 2.

[0068] It should be noted that, by adding the lower constraint device 1 to the middle and lower parts of the door leaf, the reliable constraint of the over dead point of the lower part of the door leaf can be increased, so that the deformation of the lower part of the door leaf is reduced in the case of negative pressure or passenger extrusion during vehicle movement, thereby reducing the occurrence of sound leakage of the lower part of the double-opening electric sliding door and improving the sound insulation performance of the door system in the vehicle movement state.

[0069] Moreover, the lower constraint device 1 is provided with an emergency unlocking device 8, which can realize emergency unlocking when the left unlocking torsion spring 309 and the right unlocking torsion spring fail due to fatigue and the like. The appearance of the lower constraint device 1 provided by the application is completely compatible with the commonly used double-opening electric sliding door system, that is, the added lower constraint device 1 only occupies the lower space of the door sill 2, and the driving mechanism, the door leaf, the swing arm and other components of the double-opening electric sliding door system do not need to be changed except the door sill 2.

[0070] In addition, it should be noted that the "left", "right", "up", "down" and other directions or positional relationships of the present application are based on the directions or positional relationships shown in the drawings, and are only for the convenience of simplifying the description and facilitating understanding, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0071] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. Any combination of all the embodiments provided by the present application is within the protection scope of the present application, and is not described here.

[0072] The above describes the double-sliding door system and the lower restraint device thereof provided by the present application in detail. The principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only for helping to understand the method of the present application and its core idea. It should be noted that, for those skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways. These improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A lower restraint device (1) characterized in that, It comprises: The constraint execution device (3) comprises a box body (302), a left lock fork (305) for containing a left lower blocking pin (5), a right lock fork (306) for containing a right lower blocking pin (6), a left ratchet wheel (307) below the left lower blocking pin (5), a left ratchet wheel shaft (308) penetratingly connecting the left lock fork (305) and the left ratchet wheel (307), a left pawl (310) arranged in cooperation with the left ratchet wheel shaft (308), a left unlocking torsional spring (309) for driving the left pawl (310) to reset, a right ratchet wheel below the right lower blocking pin (6), a right ratchet wheel shaft penetratingly connecting the right lock fork (306) and the right ratchet wheel, a right pawl arranged in cooperation with the right ratchet wheel, and a right unlocking torsional spring for driving the right pawl to reset, the left lock fork (305) and the right lock fork (306) are arranged in the box body (302), the action normal stress of the left ratchet wheel (307) and the left pawl (310) points to the center of the left pawl (310), and the action normal stress of the right ratchet wheel and the right pawl points to the center of the right ratchet wheel; The power assembly (4) is connected with the left pawl (310) and the right pawl respectively to drive the left pawl (310) and the right pawl to rotate; The power assembly (4) comprises a left electromagnet (401), a right electromagnet (402), a bottom plate (405), a left pull rod (406), a right pull rod (407), a left roller (408), and a right roller (409), the left roller (408) and the end of the left pawl (310) are connected, the right roller (409) and the end of the right pawl are connected, the left electromagnet (401) and the right electromagnet (402) are fixedly arranged on the bottom plate (405), one end of the left pull rod (406) is rotationally connected with the left electromagnet (401), the other end is rotationally connected with the left roller (408), one end of the right pull rod (407) is rotationally connected with the right electromagnet (402), and the other end is rotationally connected with the right roller (409); The emergency unlocking device (8) for unlocking the left ratchet wheel (307) and the right ratchet wheel in an emergency is further included; the emergency unlocking device (8) comprises a left unlocking rod (311), a right unlocking rod (312), an emergency unlocking steel wire rope assembly (313), a left transmission pin (403) arranged at one end of the left unlocking rod (311), and a right transmission pin (404) arranged at one end of the right unlocking rod (312); the left transmission pin (403) is connected with the left pull rod (406), the right transmission pin (404) is connected with the right pull rod (407), and the other end of the left unlocking rod (311) and the other end of the right unlocking rod (312) are provided with the steel wire rope of the emergency unlocking steel wire rope assembly (313).

2. Lower restraint device (1) according to claim 1, characterized in that The left height adjusting device (303) and the right height adjusting device (304) are used for pressing the power assembly (4) on the vehicle body (7).

3. Lower restraint device (1) according to claim 1, characterized in that The top of the box body (302) is detachably provided with a cover plate (301).

4. Lower restraining device (1) according to any one of claims 1 to 3, characterized in that The left lock fork (305) is provided with a left accommodating groove for accommodating the left lower blocking pin (5), and the left lock fork (305) is provided with a right accommodating groove for accommodating the right lock fork (306). The left accommodating groove is provided with a left reset torsional spring (314) for driving the left unlocking rod (311) to reset, and the right accommodating groove is provided with a right reset torsional spring (315) for driving the right unlocking rod (312) to reset.

5. A double-leaf sliding door system, characterized in that The lower restraint device (1) of any one of claims 1-4.

6. The double-leaf sliding door system according to claim 5, wherein Further comprising a door leaf, a driving mechanism for driving the door leaf to open and close, a swing arm arranged between the driving mechanism and the door leaf, and a door sill (2) arranged at the bottom of the door leaf, and the restraint execution device (3) of the lower restraint device (1) is fixedly connected with the door sill (2).

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