Locking device and boarding door for rail train

Abstract

The utility model relates to the technical field of rail transit, in particular to a locking device and an embarkation door for a rail train. The device comprises a main lock on the inner side of a cab, the main lock comprises a door handle, a transmission shaft, a limiting plate and a twisting handle rotor, the door handle drives the limiting plate to do circumferential stirring through the transmission shaft, and the limiting plate stirs an inclined spring bolt to retract backwards; the spring drives the inclined spring bolt to automatically rebound; the main lock is connected with the outer compound plate through a linkage mechanism, a shifting block and a safety lock cylinder shaft are arranged in the linkage mechanism, and an interface connected with the linkage lock is reserved on the shifting block to realize multi-point locking; the outer compound plate comprises a safety lock cylinder, and the safety lock cylinder is connected with the twisting handle rotor through a safety lock cylinder shaft; the safety of the door lock is enhanced, multiple locking and safety mechanisms are achieved through cooperation of the main lock, the linkage mechanism and the outer compound plate, it is ensured that the door is effectively locked in daily and emergency situations, and the safety of a driver and passengers is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transportation, in particular to a locking device and a boarding door for a rail train. Background Art

[0002] In the field of rail transit, ensuring the safe locking of boarding doors is a key link in maintaining the safety of passengers and vehicles. In view of the insufficient locking efficiency, operational complexity and durability challenges of existing door lock systems, technical personnel in the industry continue to work hard to introduce more optimized solutions. The new interlocking locking device for the interlocking door lock described in Chinese patent CN213269360U is an important achievement of this effort, which realizes the seamless connection and efficient coordinated control of the main lock tongue and the interlocking door lock. Despite this, in the face of the increasingly high safety standards and operational efficiency requirements of modern rail transit, the device still needs to continue to explore and optimize in terms of enhancing locking capabilities, further improving ease of operation, and ensuring durability under long-term operation. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a locking device and a boarding door for a rail train.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A locking device for a rail train comprises a main lock on the inner side of a driver's cab, the main lock comprises a door handle, a transmission shaft, a limit plate and a twist handle rotor, the door handle drives the limit plate to make a circular movement through the transmission shaft, the limit plate moves the oblique lock tongue to retract, and the spring drives the oblique lock tongue to rebound automatically; a groove is arranged on the limit plate, the groove matches with the fan-shaped protrusion of the twist handle rotor, and a notch is arranged on the middle cylindrical surface of the twist handle rotor, so as to provide a self-restoring force for the square lock tongue in the process of telescoping and popping out;

[0006] The main lock is connected to the outer cover plate through a linkage mechanism. The linkage mechanism has a toggle block and a safety lock core shaft built in. The toggle block is provided with an interface for connecting with the linkage lock to achieve multi-point locking. The outer cover plate includes a safety lock core, and the safety lock core is connected to the twist handle rotor through the safety lock core shaft.

[0007] The technical solution realizes the preliminary locking, safety locking and synchronous linkage functions of the door lock through the coordinated work of the door handle, the oblique lock tongue, the square lock tongue, the safety twist handle, the linkage mechanism and the safety lock cylinder on the outer cover plate, thereby ensuring the safety of the boarding door. Specifically, the groove on the limit plate cooperates with the twist handle rotor to limit the locking feedback of the rotation angle of the twist handle rotor; the core of the linkage mechanism is the toggle block, which is connected to the upper extending tongue and the lower extending tongue through the wings at both ends. When the toggle block is subjected to the torque of the key, it can simultaneously drive the upper extending tongue and the lower extending tongue to move, thereby realizing the synchronous action of the left-linked lock and the right-linked lock; the middle part of the toggle block is coaxially arranged with the limit plate. When the key is inserted into the safety lock hole of the outer plate and rotated, the torque is transmitted to the toggle block through the safety lock core shaft and the twist handle rotor, thereby driving the linkage mechanism to work; when the key is inserted and rotated, the safety lock cylinder is driven to rotate, and then the torque is transmitted to the twist handle rotor through the safety lock core shaft, and the door lock is safety locked or unlocked by the key; the main lock hole and the safety lock hole are respectively arranged on the outer plate. The main lock hole is usually used for daily door opening and closing operations, while the safety lock hole is used to provide additional locking protection when needed.

[0008] In addition, the locking device for rail vehicles proposed in the utility model also has the following additional technical features:

[0009] According to an embodiment of the utility model, the door handle is coaxially arranged with the limit plate, and the side of the limit plate controls the telescopic movement of the oblique lock tongue through a reset spring; the safety twist handle is coaxially arranged with the twist handle rotor, and the twist handle rotor drives the telescopic movement of the square lock tongue.

[0010] In the technical solution, the door handle is coaxially arranged with the limit plate. When the door handle is rotated, the limit plate is driven to make a circular motion through the transmission shaft. The side of the limit plate is connected to the oblique lock tongue through a reset spring. When the limit plate rotates, the reset spring can be compressed or released, thereby controlling the extension and retraction of the oblique lock tongue. The extension and retraction of the oblique lock tongue is used for the preliminary locking and unlocking of the boarding door. The safety twist handle is coaxially arranged with the twist handle rotor. Rotating the safety twist handle will drive the twist handle rotor to rotate. The twist handle rotor drives the square lock tongue to perform a telescopic motion, thereby providing an additional safety lock for the boarding door.

[0011] According to an embodiment of the utility model, a long strip-shaped notch is provided in the middle of the oblique lock tongue, one end of the return spring passes through the spring limiting shaft and is slidably arranged in the notch, and the other end of the return spring is coaxially arranged with the limiting plate through the transmission shaft.

[0012] The technical solution sets a long strip notch in the middle of the oblique lock tongue and utilizes a combination of a return spring and a transmission shaft to realize automatic retraction of the oblique lock tongue when the door handle is rotated and automatic rebound after unloading, thereby enhancing the flexibility and durability of the door lock.

[0013] According to an embodiment of the utility model, a safety lock handle core is arranged between the safety twist handle and the twist handle rotor, and the end of the safety lock handle core is a four-corner boss fixedly connected to the twist handle rotor and the flange bearing.

[0014] According to one embodiment of the utility model, a safety lock handle core is arranged between the safety twist handle and the twist handle rotor, and the end of the safety lock handle core is a four-corner boss, which is fixedly connected to the twist handle rotor and the flange bearing; a fan-shaped protrusion matching the groove of the limit plate is arranged on the top of the twist handle rotor; a notch is arranged on the middle cylindrical surface of the twist handle rotor for fixing the main torsion spring, which is used to provide self-restoring force for the square lock tongue during the telescopic and pop-up process.

[0015] According to one embodiment of the utility model, the door handle passes through the handle gasket and is sleeved on the limit plate, and the handle gasket is used to eliminate the abnormal noise caused by the rotation of the door handle; a cylindrical pin is provided at the tail of the square lock tongue, and a wear-resistant sleeve is arranged on the cylindrical pin, and the cylindrical pin is used to slide in the oblong groove at the lower part of the main lock; a limit plate is provided on the inner side of the main lock to eliminate the friction between the square lock tongue and the main lock during the forward and backward extension process.

[0016] This technical solution uses a handle pad to fit the door handle and install it on the limit plate, so as to eliminate the abnormal noise generated by the door handle during rotation and improve the user experience. By setting a cylindrical pin with a wear-resistant sleeve at the tail of the square lock tongue and installing a limit plate on the inside of the main lock, the friction between the square lock tongue and the main lock during the extension and retraction process is effectively reduced, thus extending the service life of the door lock.

[0017] According to one embodiment of the utility model, the toggle block passes through the circular hole on the upper part of the linkage mechanism, and is connected as a whole with the torsion spring, shaft sleeve and stop sleeve of the door handle passing through in the opposite direction, wherein the torsion spring, shaft sleeve and stop sleeve are used for the door handle to have self-restoring force after the movement unloading force; a toggle pin sleeve is also provided in the middle part of the toggle block, which is used to eliminate abnormal noise and shaking when the toggle block is driven by a key.

[0018] This technical solution connects the toggle block with the torsion spring, shaft sleeve and stop sleeve of the door handle, and arranges a toggle pin sleeve in the middle of the toggle block. This not only provides self-restoring force for the door handle, but also eliminates abnormal noise and shaking when the toggle block is driven by the key, thereby improving the operational stability of the door lock.

[0019] According to one embodiment of the utility model, after the key is inserted into the safety lock cylinder, it is rotated ninety degrees to complete the extension / retraction action of the safety lock, and then the key is rotated ninety degrees as an empty stroke to return the key to its initial position and then be pulled out; the outer cover plate is provided with a key unlocking indication mark.

[0020] This technical solution provides users with clear safety lock operation guidance and feedback through a specific operation mode of the safety lock cylinder (rotate 90 degrees to complete the action after inserting the key, and then rotate 90 degrees as an idle stroke) combined with the key unlocking indicator on the outer panel.

[0021] In order to achieve the above-mentioned purpose, the utility model also provides a boarding door.

[0022] A boarding door includes a linkage lock, wherein the linkage lock includes a left linkage lock and a right linkage lock connected to a linkage mechanism; interfaces on a toggle block are respectively connected to an upper extending tongue and a lower extending tongue, wherein:

[0023] The upper extending tongue is connected to the left linkage lock through an upper connecting rod, and an upper guide is installed on the upper connecting rod;

[0024] The lower extending movable tongue is connected to the right linkage lock through a lower connecting rod, and a lower guide is installed on the lower connecting rod;

[0025] The length of the lower movable tongue is greater than that of the upper movable tongue, and a fixed plate for limiting the movement direction of the lower movable tongue is provided in the linkage mechanism;

[0026] It is connected with the left interlock and the right interlock through the interlocking mechanism to realize multi-point interlocking.

[0027] In the present technical solution, the rotation of the door handle is not limited to the initial unlocking, but also transmits power to the toggle block through the linkage mechanism; the toggle block then drives the upper and lower extending tongues to move, and the two extending tongues are respectively connected to the left interlock and the right interlock through the upper connecting rod and the lower connecting rod, so as to realize the synchronous unlocking of the interlocks on the left and right sides, and the multi-point linkage enhances the safety of the door lock system; when the boarding door is closed, the user releases the door handle, and the reset spring plays its role at this time, so that the inclined lock tongue automatically rebounds to the extended state and re-locks the boarding door; the upper and lower extending tongues are reset under the guidance of the connecting rod, driving the left interlock and the right interlock to re-lock. New lock to ensure the immediate safety of the door after closing; the user inserts the key and rotates the safety lock cylinder 90 degrees, and uses the transmission of the safety lock cylinder shaft and the twist handle rotor to retract the square lock tongue for safety locking; after rotating in place, continue to rotate the key 90 degrees as an empty stroke to facilitate the user to pull out the key; when the safety lock needs to be released, the user inserts the key again and rotates it in the opposite direction to the empty stroke, then turns it back to the initial position and pulls out the key, at which time the square lock tongue extends under the action of the main torsion spring, completing the release of the safety lock, increasing the security level of the door lock system, and preventing unauthorized access.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] Enhance the security of door locks by using the main lock, linkage mechanism and outer cover to achieve multiple locking and insurance mechanisms, ensuring effective locking of doors in daily and emergency situations to protect the safety of drivers and passengers; improve user experience by using silent handle pads, automatic tilted lock tongue and clear operating instructions to make the door opening and closing process quieter, smoother and easier to operate; enhance durability by using tilted lock tongue to reduce wear, modularization facilitates maintenance, reduces maintenance costs and extends the service life of door locks. Description of the Drawings

[0030] Figure 1 is the exploded view of the present utility model.

[0031] Figure 2 is the perspective view of the present utility model.

[0032] Figure 3 is the exploded view of the main lock.

[0033] Figure 4 is the exploded view of the linkage mechanism.

[0034] Figure 5 is the exploded view of the outer cladding plate.

[0035] Figure 6 is the perspective view of the boarding door.

[0036] In the figures: 1. Main lock; 11. Door handle; 12. Oblique locking tongue; 13. Return spring; 14. Square locking tongue; 15. Limiting plate; 16. Twisting handle rotor; 17. Safety twisting handle; 2. Linkage mechanism; 21. Torsion spring; 22. Pushing block; 23. Upper extending moving tongue; 24. Safety lock core shaft; 25. Lower extending moving tongue; 26. Fixed plate; 3. Outer cladding plate; 31. Plate body; 32. Safety lock core; 33. Fixed plate; 4. Left linkage lock; 5. Upper connecting rod; 6. Upper guiding member; 7. Lower connecting rod; 8. Lower guiding member; 9. Right linkage lock. Detailed Embodiment

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] Embodiment 1

[0039] As Figures 1 to 2 shown, this embodiment provides a locking device for a rail train, including a main lock 1 on the inner side of the driver's cab. The main lock 1 includes a door handle 11, a transmission shaft, a limiting plate 15, and a twisting handle rotor 16. The door handle 11 drives the limiting plate 15 to make a circular movement through the transmission shaft, and the limiting plate 15 drives the oblique locking tongue 12 to retract; the spring drives the oblique locking tongue 12 to automatically rebound; a groove is provided on the limiting plate 15, which cooperates with the fan-shaped protrusion of the twisting handle rotor 16. A notch is provided on the middle cylindrical surface of the twisting handle rotor 16 to provide a self-restoring force for the square locking tongue 14 during the telescopic ejection process;

[0040] As Figures 3 to 5As shown in the figure, the main lock 1 is connected to the outer cladding 3 through a linkage mechanism 2. The linkage mechanism 2 is internally provided with a toggle block 22 and a safety lock core shaft 24. An interface for connecting to a linkage lock is reserved on the toggle block 22 to achieve multi-point locking. The outer cladding 3 includes a safety lock core 32, and the safety lock core 32 is connected to the torsion handle rotor 16 through the safety lock core shaft 24.

[0041] As Figures 1 to 5 shown, through the coordinated work of the door handle 11, the diagonal locking tongue 12, the square locking tongue 14, the safety torsion handle 17, the linkage mechanism 2, and the safety lock core 32 on the outer cladding 3, the present technical solution realizes the preliminary locking, safety locking, and synchronous linkage functions of the door lock, thereby ensuring the safety of the boarding door. Specifically, the groove on the limit plate 15 cooperates with the torsion handle rotor 16 to limit the locking feedback of the rotation angle of the torsion handle rotor 16. The core of the linkage mechanism 2 is the toggle block 22, which is respectively connected to the upper extending tongue 23 and the lower extending tongue 25 through the wings at both ends. When the toggle block 22 receives the torque of the key, it can simultaneously drive the upper extending tongue 23 and the lower extending tongue 25 to move, thereby realizing the synchronous action of the left linkage lock 4 and the right linkage lock 9. The middle part of the toggle block 22 is coaxially arranged with the limit plate 15. When the key is inserted into the safety lock hole of the outer cladding 3 and rotated, the torque is transmitted to the toggle block 22 through the safety lock core shaft 24 and the torsion handle rotor 16, thereby driving the linkage mechanism 2 to work. When the key is inserted and rotated, it drives the safety lock core 32 to rotate, and then transmits the torque to the torsion handle rotor 16 through the safety lock core shaft 24 to lock or unlock the door lock with the key. The outer cladding 3 is respectively provided with a main lock 1 hole and a safety lock hole. The main lock 1 hole is usually used for daily door opening and closing operations, while the safety lock hole is used to provide additional locking protection when needed.

[0042] In addition, according to the above-mentioned locking device for rail vehicles proposed by the present invention, it also has the following additional technical features:

[0043] According to an embodiment of the present invention, the door handle 11 is coaxially arranged with the limit plate 15, and the side part of the limit plate 15 controls the telescopic movement of the diagonal locking tongue 12 through a return spring 13. The safety torsion handle 17 is coaxially arranged with the torsion handle rotor 16, and the torsion handle rotor 16 drives the square locking tongue 14 to perform telescopic movement.

[0044] In this technical solution, the door handle 11 is coaxially arranged with the limit plate 15. When the door handle 11 is rotated, it drives the limit plate 15 to perform a circular motion through a transmission shaft. The side part of the limit plate 15 is connected to the diagonal locking tongue 12 through a return spring 13. When the limit plate 15 rotates, it can compress or release the return spring 13, thereby controlling the telescopic movement of the diagonal locking tongue 12. The telescopic movement of the diagonal locking tongue 12 is used for the preliminary locking and unlocking of the boarding door. The safety torsion handle 17 is coaxially arranged with the torsion handle rotor 16. Rotating the safety torsion handle 17 will drive the torsion handle rotor 16 to rotate, and the torsion handle rotor 16 drives the square locking tongue 14 to perform telescopic movement to provide additional safety locking for the boarding door.

[0045] According to an embodiment of the utility model, a long strip-shaped notch is provided in the middle of the oblique lock tongue 12, one end of the return spring 13 passes through the spring limiting shaft and is slidably arranged in the notch, and the other end of the return spring 13 is coaxially arranged with the limiting plate 15 through the transmission shaft.

[0046] This technical solution sets a long strip notch in the middle of the oblique lock tongue 12 and utilizes the combination of the return spring 13 and the transmission shaft to realize the automatic retraction of the oblique lock tongue 12 when the door handle 11 rotates and the automatic rebound after unloading, thereby enhancing the flexibility and durability of the door lock.

[0047] According to an embodiment of the utility model, a safety lock handle core is arranged between the safety twist handle 17 and the twist handle rotor 16, and the end of the safety lock handle core is a four-corner boss fixedly connected to the twist handle rotor 16 and the flange bearing.

[0048] According to one embodiment of the utility model, a safety lock handle core is arranged between the safety twist handle 17 and the twist handle rotor 16, and the end of the safety lock handle core is a four-corner boss, which is fixedly connected to the twist handle rotor 16 and the flange bearing; a fan-shaped protrusion matching the groove of the limit plate 15 is arranged on the top of the twist handle rotor 16; a notch is arranged on the middle cylindrical surface of the twist handle rotor 16 for fixing the main torsion spring, which is used to provide the self-restoring force of the square lock tongue 14 during the telescopic and pop-up process.

[0049] According to one embodiment of the utility model, the door handle 11 passes through the handle gasket and is sleeved on the limit plate 15, and the handle gasket is used to eliminate the abnormal noise caused by the rotation of the door handle 11; a cylindrical pin is provided at the tail of the square lock tongue 14, and a wear-resistant sleeve is arranged on the cylindrical pin, and the cylindrical pin is used to slide in the oblong groove at the lower part of the main lock 1; a limit plate 15 is provided on the inner side of the main lock 1 to eliminate the friction between the square lock tongue 14 and the main lock 1 during the forward and backward extension process.

[0050] The technical solution uses a handle cushion sleeve to sleeve the door handle 11 and install it on the limit plate 15, so as to eliminate the abnormal noise generated by the door handle 11 during rotation and improve the user experience. By arranging a cylindrical pin with a wear-resistant sleeve at the tail of the square lock tongue 14 and installing the limit plate 15 on the inner side of the main lock 1, the friction between the square lock tongue 14 and the main lock 1 during the extension and retraction process is effectively reduced, thereby extending the service life of the door lock.

[0051] According to one embodiment of the utility model, the toggle block 22 passes through the circular hole on the upper part of the linkage mechanism 2, and is connected as a whole with the torsion spring 21, the shaft sleeve and the stop sleeve of the door handle 11 passing through oppositely, wherein the torsion spring 21, the shaft sleeve and the stop sleeve are used for the door handle 11 to have self-restoring force after the movement unloading force; the middle part of the toggle block 22 is also provided with a toggle pin sleeve, which is used to eliminate abnormal noise and shaking when the toggle block 22 is driven by a key.

[0052] In this technical solution, the toggle block 22 is integrated with the torsion spring 21, the bushing and the retaining sleeve of the door handle 11, and a toggle pin sleeve is arranged in the middle of the toggle block 22, which not only provides a self-restoring force for the door handle 11, but also eliminates the abnormal noise and shaking when the key drives the toggle block 22, improving the operation stability of the door lock.

[0053] According to an embodiment of the present invention, after the key is inserted into the safety lock cylinder 32, it rotates 90 degrees to complete the extending / retracting action of the safety lock, and then rotates the key 90 degrees for an idle stroke to return the key to the initial position and then pull it out; the outer cover plate 3 is provided with a key unlocking indication mark.

[0054] This technical solution provides clear operation guidance and feedback for the user through the specific operation mode of the safety lock cylinder 32 (rotating 90 degrees after inserting the key to complete the action, and then rotating 90 degrees as an idle stroke), combined with the key unlocking indication mark on the outer cover plate 3.

[0055] Embodiment 2

[0056] Based on Embodiment 1, as Figure 6 shown, this embodiment provides a boarding door, including a linkage lock, and the linkage lock includes a left linkage lock 4 and a right linkage lock 9 connected to the linkage mechanism 2; the interfaces on the toggle block 22 are respectively connected to the upper extending tongue 23 and the lower extending tongue 25, where:

[0057] The upper extending tongue 23 is connected to the left linkage lock 4 through the upper connecting rod 5, and an upper guiding member 6 is installed on the upper connecting rod 5;

[0058] The lower extending tongue 25 is connected to the right linkage lock 9 through the lower connecting rod 7, and a lower guiding member 8 is installed on the lower connecting rod 7;

[0059] The length of the lower extending tongue 25 is greater than the length of the upper extending tongue 23, and a fixing piece 26 for limiting the movement direction of the lower extending tongue 25 is arranged in the linkage mechanism 2;

[0060] By connecting with the left linkage lock 4 and the right linkage lock 9 through the linkage mechanism 2, multi-point linkage locking is realized.

[0061] In the present technical solution, the rotation of the door handle 11 is not limited to the initial unlocking, but also transmits the power to the toggle block 22 through the linkage mechanism 2; the toggle block 22 then drives the upper and lower extending tongues 25 to move, and the two extending tongues are respectively connected to the left interlock 4 and the right interlock 9 through the upper connecting rod 5 and the lower connecting rod 7, so as to realize the synchronous unlocking of the interlocks on the left and right sides, and the multi-point linkage enhances the safety of the door lock system; when the boarding door is closed, the user releases the door handle 11, at this time the reset spring 13 plays its role, so that the inclined lock tongue 12 automatically rebounds to the extended state, and re-locks the boarding door; the upper and lower extending tongues 25 are reset under the guidance of the connecting rod, driving the left interlock 4 and The right interlock 9 is relocked to ensure the immediate safety of the door after closing; the user inserts the key and rotates the safety lock cylinder 32 ninety degrees, and uses the transmission of the safety lock cylinder shaft 24 and the twist handle rotor 16 to retract the square lock tongue 14 to perform safety locking; after rotating in place, continue to rotate the key ninety degrees as an idle stroke to facilitate the user to pull out the key; when the safety lock needs to be released, the user inserts the key again and rotates it in the opposite direction to the idle stroke, then turns it back to the initial position and pulls out the key, at which time the square lock tongue 14 extends under the action of the main torsion spring, completing the release of the safety lock, increasing the security level of the door lock system, and preventing unauthorized access.

[0062] Although the utility model is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, ordinary technicians in the field can make various equivalent modifications or substitutions to the embodiments of the utility model, and these modifications or substitutions should be within the scope of the utility model / any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A locking device for an orbital train, characterized in that, The invention comprises a main lock (1) on the inner side of the driver's cab, wherein the main lock (1) comprises a door handle (11), a transmission shaft, a limit plate (15) and a twist handle rotor (16); the door handle (11) drives the limit plate (15) to make a circular movement through the transmission shaft, and the limit plate (15) moves the oblique lock tongue (12) to retract; a spring drives the oblique lock tongue (12) to automatically rebound; a groove is arranged on the limit plate (15), and the groove matches with a fan-shaped protrusion of the twist handle rotor (16); a notch is arranged on the central cylindrical surface of the twist handle rotor (16), and is used to provide a self-restoring force for the square lock tongue (14) during the process of telescoping and ejecting; The main lock (1) is connected to the outer cover plate (3) through a linkage mechanism (2). The linkage mechanism (2) is equipped with a toggle block (22) and a safety lock core shaft (24). An interface for connecting with the linkage lock is reserved on the toggle block (22) to realize multi-point locking. The outer cover plate (3) includes a safety lock core (32). The safety lock core (32) is connected to a twist handle rotor (16) through the safety lock core shaft (24).

2. The locking device for rail trains according to claim 1, characterized in that, The door handle (11) is coaxially arranged with the limit plate (15), and the side of the limit plate (15) controls the telescopic movement of the oblique lock tongue (12) through the return spring (13); the safety twist handle (17) is coaxially arranged with the twist handle rotor (16), and the twist handle rotor (16) drives the square lock tongue (14) to telescopic movement.

3. The locking device for rail trains according to claim 2, characterized in that, A long strip-shaped notch is arranged in the middle of the oblique lock tongue (12); one end of the return spring (13) passes through the spring limiting shaft and is slidably arranged in the notch; the other end of the return spring (13) is coaxially arranged with the limiting plate (15) through the transmission shaft.

4. The locking device for rail trains according to claim 2, characterized in that, A safety lock handle core is arranged between the safety twist handle (17) and the twist handle rotor (16), and the end of the safety lock handle core is a four-corner boss fixedly connected to the twist handle rotor (16) and the flange bearing.

5. The locking device for rail trains according to claim 4, characterized in that, The door handle (11) passes through the handle gasket and is sleeved on the limit plate (15), and the handle gasket is used to eliminate abnormal noise caused by the rotation of the door handle (11); a cylindrical pin is provided at the tail of the square lock tongue (14), and a wear-resistant sleeve is provided on the cylindrical pin, and the cylindrical pin is used to slide in the oblong groove at the bottom of the main lock (1); a limit plate (15) is provided on the inner side of the main lock (1) to eliminate friction between the square lock tongue (14) and the main lock (1) during the process of forward and backward extension.

6. The locking device for rail trains according to claim 1, characterized in that The toggle block (22) passes through the circular hole on the upper part of the linkage mechanism (2) and is connected to the torsion spring (21), the shaft sleeve and the stop sleeve of the door handle (11) passing through in the opposite direction, wherein the torsion spring (21), the shaft sleeve and the stop sleeve are used to ensure that the door handle (11) has a self-restoring force after the movement force is unloaded; a toggle pin sleeve is also provided in the middle part of the toggle block (22) for eliminating abnormal noise and shaking when the toggle block (22) is driven by a key.

7. The locking device for rail trains according to claim 6, characterized in that, After the key is inserted into the safety lock cylinder (32), the safety lock is rotated 90 degrees to complete the extension / retraction action of the safety lock, and then the key is rotated 90 degrees as an idle stroke, so that the key returns to the initial position and is then pulled out; the outer cover plate (3) is provided with a key unlocking indication mark.

8. An embarkation door, which adopts the locking device for rail trains as described in any one of claims 1-7, is characterized in that, The invention comprises a linkage lock, wherein the linkage lock comprises a left linkage lock (4) and a right linkage lock (9) connected to a linkage mechanism (2); interfaces on a toggle block (22) are respectively connected to an upper extending tongue (23) and a lower extending tongue (25), wherein: The upward extending moving tongue (23) is connected to the left linkage lock (4) through the upper connecting rod (5), and an upper guide (6) is installed on the upper connecting rod (5); The downward extending moving tongue (25) is connected to the right linkage lock (9) through the lower connecting rod (7), and a lower guide (8) is installed on the lower connecting rod (7); The length of the downward extending moving tongue (25) is greater than that of the upward extending moving tongue (23), and a fixing piece (26) for limiting the movement direction of the downward extending moving tongue (25) is arranged in the linkage mechanism (2); The left linkage lock (4) and the right linkage lock (9) are connected through the linkage mechanism (2) to achieve multi-point linkage locking.

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