CN213898541U

CN213898541U - Door lock of railway vehicle cab

Info

Publication number: CN213898541U
Application number: CN202021927056.9U
Authority: CN
Inventors: 姚春良; 胡伟力
Original assignee: Ningbo Shengjiu Technology Co ltd
Current assignee: Ningbo Shengjiu Technology Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-08-06
Anticipated expiration: 2030-09-07

Abstract

The utility model relates to a rail vehicle cab lock is to solving the not good enough technical problem of current like product structural design and designing. The main point is that a positioning piece is fixedly arranged on one side of the outer diameter of a transmission shaft in the cab door lock, a crank arm head on one side of the positioning piece is abutted against one end of a connecting piece, a positioning piece torsion spring is arranged on the transmission shaft at the positioning piece, one end of the positioning piece torsion spring is fixed on the ring surface of the positioning piece, a lifting rod head is arranged on the other side of the outer diameter of the positioning piece in a protruding mode, the lifting rod head of the positioning piece is abutted against the edge of one hooking side of a lock catch, and a lock; the other end side of connecting piece is equipped with the spacing groove, and the flat keyway department of locking knob embolias fixedly to be equipped with the shift fork in the inner lock shell, and the outside diameter one side arch of shift fork is equipped with special-shaped head, and the spacing groove of shift fork inserts the connecting piece, is fixed in the inner lock shell through slide hole department screw between the both ends of connecting piece, and the screw department of connecting piece is equipped with the shift fork torsional spring that one end and shift fork outside diameter special-shaped head offset.

Description

Door lock of railway vehicle cab

Technical Field

The utility model relates to a lock of locomotive is a rail vehicle cab lock.

Background

The existing locomotive door lock is mainly used for metal door plates of trains, subways and the like, a triangular or square key hole is generally arranged in a base of the locks, a lock cylinder is connected with a lock tongue, and the lock cylinder is rotated through a triangular or square key to open and close the door plate. Some of the door locks are applied to the cab door, such as application number 201821625558.9 disclosed in chinese patent literature, publication date 2020.06.20, utility model name "a subway cab door lock"; further, like the application number 201920119981.X disclosed in the Chinese patent document, the granted notice date 2019.11.29, the utility model discloses a rail vehicle cab door lock. However, the door lock and the like are realized through a bolt structure without adopting a lock hook structure, the application range of the distance between door gaps is small, the position of a door frame with the aligned bolt is difficult to adjust, and the overall linkage and interlocking effect is poor.

Disclosure of Invention

In order to overcome the defects, the utility model aims to provide a rail vehicle cab door lock for floating gate to this field, make it solve current like product and lack the structural design who realizes locking and position control through the latch hook to and linkage and interlocking structural design not good enough technical problem. The purpose is realized by the following technical scheme.

The utility model provides a rail vehicle cab lock, the door plant is fixed in through the fix with screw to the outer lock shell and the inner lock shell of this cab lock, and the second handle of outer lock shell and the first handle of inner lock shell pass through the transmission shaft even as an organic whole, and the first handle below of inner lock shell is equipped with the locking knob, and in the locking knob of inner lock shell stretched into the base of outer lock shell through the lock core axle, the tip of lock core axle was the square head in the base. The outer diameter of a transmission shaft in the inner lock shell is provided with a lock catch, one end of the lock catch is sleeved at the end part of a first handle of the outer diameter of the transmission shaft, the other end of the lock catch extends out of a side hole of the inner lock shell and is provided with a lock hook, and the lock hook of the lock catch extends into a lock box assembly of a door frame and is hooked with a hook hole at one side of a lock box of the lock box assembly; a positioning piece is fixedly arranged on one side of the inner lock shell of the outer diameter of the transmission shaft, a turning arm head is convexly arranged on one side of the outer diameter of the positioning piece, the turning arm head of the positioning piece is abutted against one end of the connecting piece, a positioning piece torsional spring is arranged on the transmission shaft at the positioning piece, one end of the positioning piece torsional spring is fixed on the ring surface of the positioning piece, a lifting rod head is convexly arranged on the other side of the outer diameter of the positioning piece, the lifting rod head of the positioning piece is abutted against the edge of one hooking side of the lock catch, a lock catch torsional spring is arranged on the outer diameter of the transmission shaft between the positioning piece and the lock catch, and one end of the lock catch torsional spring is fixed on the other locking symmetrical side of the lock catch; the other end side of connecting piece is equipped with the spacing groove, the flat keyway department of locking knob embolias fixedly to be equipped with the shift fork in the inner lock shell, the protruding special-shaped head that is equipped with in external diameter one side of shift fork, the spacing groove of connecting piece is inserted to the special-shaped head of shift fork, through slide hole department screw fixation in the inner lock shell between the both ends of connecting piece, the screw department of connecting piece is equipped with the shift fork torsional spring, the one end of shift fork torsional spring offsets with the special-shaped head of shift fork external diameter, the setting element torsional spring, the packing ring, the setting element, the hasp torsional spring, the hasp, the separation blade, the gasket is fixed in proper order through the retaining ring for the axle and is inserted the first handle external diameter of inner lock shell. The cab door lock is locked from the inside through the locking knob of the inner lock shell, the lock catch can be driven to rotate by rotating the first handle or the second handle, and the rotation of the lock catch is realized through the rod lifting head of the positioning piece; meanwhile, the cab door lock can lock and unlock the locking knob through a lock core shaft of the outer lock shell, and the locking and unlocking of the locking knob are realized by driving the connecting piece to move up and down through the shifting fork and rotating the limiting positioning piece.

The outer diameter of the turning arm head of the positioning element is provided with a convex limiting head, the inner lock shell corresponding to the limiting head is provided with a limiting block, the limiting head of the positioning element is connected with the turning arm head to form a vertical included angle, the limiting head is fan-shaped, the end part of the limiting head is provided with an end edge protruding towards the inner lock shell, and the fixed end of one side of the positioning element torsion spring is located on the circle surface of the inner lock shell on one side between the limiting head and the lifting rod head. The structure enables the positioning piece to rotate further stably, and realizes the limiting rotation and the resetting rotation of the positioning piece.

The lifting rod head and the crank arm head of the positioning piece are distributed at a right angle from the axis, and the end part of the lifting rod head is protruded towards one side of the outer lock shell and is propped against the edge of the hooked side of the lock catch. The structure is convenient for the rod lifting head of the positioning piece to be further used, and the technical purpose and the technical effect are achieved.

The inner diameter of the center hole of the positioning piece is symmetrically provided with convex pin heads, the pin heads of the positioning piece are inserted into open grooves at two sides of one end of the transmission shaft, and the positioning piece is connected with the first transmission shaft into a whole. The above is an embodiment of the structure in which the positioning member and the transmission shaft are integrally connected.

The slide opening department of connecting piece is equipped with protruding limit, and the spacing groove side of connecting piece is less than the protruding limit of connecting piece, and the setting element side of connecting piece is less than the spacing groove side of connecting piece, is equipped with arc chamfer limit between the protruding limit both sides of connecting piece and the setting element side of connecting piece, the spacing groove side, and the protruding limit symmetry opposite side locking knob one end of connecting piece is equipped with the end limit groove, the end limit groove sets up in interior lock shell one side, be equipped with the clearance opening between the long limit groove in end limit groove and the minor face groove, the end limit groove length of connecting piece is greater than the protruding limit of connecting piece. The embodiment of the concrete structure of the connecting piece enables the space in the inner lock shell to be utilized more reasonably, and the connecting piece occupies the minimum space to meet the technical purpose and the technical effect.

The special-shaped end part of the shifting fork is provided with a groove, the end part of the special-shaped end is protruded towards one side of the outer lock shell, a corresponding side groove is formed in the connecting piece below the groove, one end of a torsion spring of the shifting fork is fixed in the groove of the special-shaped end, and two ends of the side groove, corresponding to the limiting groove of the connecting piece, are in a shape like the Chinese character < >. The structure further improves the linkage and interlocking effect between the shifting fork and the connecting piece, and facilitates the fixation of one end of the shifting fork torsional spring on the shifting fork.

The one end of second handle is fixed in the handle hole of outer lock shell bottom through the handle retaining ring, and the second handle external diameter of handle retaining ring department is equipped with spacing piece, and spacing piece torsional spring sets up in the second handle external diameter of outer lock shell bottom, and the one end of spacing piece torsional spring is fixed in the drill way of outer lock shell bottom, and the other end of spacing piece torsional spring is fixed in spacing piece, and the U-shaped inslot of spacing piece one side is equipped with spacing post bottom the outer lock shell, and spacing post is the dicyclo. The above structure further restricts the rotation of the second handle.

The outer screw thread department of base is equipped with the nut, and the base is fixed in the outer lock shell through the nut, and the lock core axle is equipped with horizontal male spacer pin, and the spacer pin of lock core axle is located the arc wall of base. The structure is a structural embodiment of limiting rotation of the lock core shaft.

The utility model discloses a lock box, including lock box subassembly, box seat, U-shaped hole, box seat, mounting hole, gleitbretter, lock box and box seat junction, the U-shaped hole of lock box subassembly is equipped with the box seat through fix with rivet, the U-shaped hole of box seat and the limit hole of box seat communicate with each other, the box seat is the L font, the box seat is equipped with the mounting hole, the limit downthehole gleitbretter that is equipped with of lock box, the gleitbretter passes through the screw mounting in the waist shape hole of box seat, the gleitbretter one side chimb that stretches out lock box department limit hole is equipped with interior hexagonal rivet, the gleitbretter passes through the chimb and spacing in the limit hole of lock box. The structure is convenient for the installation of the lock box assembly and the adjustment of the installation position.

The position of the sliding piece in the lock box is provided with a lock block, the lock block is in a right-angled triangle shape, one end of the lock block is fixed on the lock box through a pin shaft and is positioned in the lock box to swing, and the bevel edge of the lock block faces the lock catch. The position of above-mentioned structure messenger hasp when inserting the lock box obtains spacing and blockking to be convenient for after the hasp inserts the lock box, the cooperation makes it further withhold the lock box through locking piece push down the hasp.

The plane of the shaft hole on one side of the inner lock shell at one end of the lock catch is provided with a flat key groove, the flat key groove of the lock catch is sleeved with the step ring of the outer diameter of the end part of the first handle, and the end part of the lock hook at the other end of the lock catch is provided with a plane end. The structure is convenient for the lock catch to be further sleeved with the end part of the first handle, and the collision hook at one end of the lock box component of the lock catch is hooked.

The utility model has reasonable structural design, convenient production, assembly, use and installation, good stability and good linkage and interlocking effect; the sliding door lock is suitable for being used as a door lock of a sliding door in a cab of a railway vehicle and the structural improvement of the similar products.

Drawings

Fig. 1 is a schematic diagram of the explosion structure of the present invention.

Fig. 2 is a schematic perspective view of the present invention.

Fig. 3 is a schematic rear perspective view of fig. 2.

Fig. 4 is a schematic sectional structure diagram of the present invention.

Fig. 5 is a schematic structural diagram of the internal part of the present invention, and the arrow in the diagram indicates the moving direction of the connecting member.

Fig. 6 is a schematic structural view of the internal working principle of the present invention, and the arrows in the figure are the moving direction of the connecting member and the rotating direction of the lock catch respectively.

Fig. 7 is a rear view of the structure of fig. 6, with the outer lock housing omitted and the inner lock housing added.

Figure number and name: 1. the lock comprises an outer lock shell, 101, a limiting column, 2, a transmission shaft, 3, a shaft retainer ring, 4, a gasket, 5, a baffle plate, 6, a lock catch, 7, a lock catch torsion spring, 8, a positioning piece, 801, a crank arm head, 802, a lifting rod head, 803, a limiting head, 9, a gasket, 10, a positioning piece torsion spring, 11, a connecting piece, 1101, a limiting groove, 1102, an end edge groove, 12, an inner lock shell, 1201, a limiting block, 13, a first handle, 14, a screw, 15, a locking knob, 16, a shifting fork torsion spring, 17, a shifting fork, 1701, a special-shaped head, 18, a lock core shaft, 19, a base, 20, a limiting piece, 21, a second handle, 22, a lock box, 23, a box base, 24, a sliding piece, 25 and a lock block.

Detailed Description

The structure and use of the present invention will now be further described with reference to the accompanying drawings. As shown in fig. 1-7, the cab door lock comprises an outer door lock component, an inner door lock component and a lock box component, wherein an outer lock shell 1 and an inner lock shell 12 of the cab door lock are fixed on a door panel through screws 14, a second handle 21 of the outer lock shell and a first handle 13 of the inner lock shell are connected into a whole through a transmission shaft 2, a locking knob 15 is arranged below the first handle of the inner lock shell, the locking knob of the inner lock shell extends into a base 19 of the outer lock shell through a lock core shaft 18, the end part of the lock core shaft in the base is of a square head, the square head of the lock core shaft is used as a lock core, and the locking knob is used as a safety bolt. The transmission shaft external diameter in the inner lock shell is equipped with hasp 6, and the first handle tip of transmission shaft external diameter is overlapped to one end of hasp, and the other end of hasp stretches out the side hole of inner lock shell and is equipped with the latch hook, and the latch hook of hasp stretches into the lock box subassembly of door frame to with the hook hole department of lock box 22 one side of lock box subassembly hook. The fixed external diameter one side arch that is equipped with setting element 8 setting element in inner lock shell one side of transmission shaft external diameter is equipped with turning arm head 801, the turning arm head of setting element offsets with the one end of connecting piece 11, the transmission shaft of setting element department is equipped with setting element torsional spring 10, the one end of setting element torsional spring is fixed in the circle face of setting element, the protruding pole-lifting head 802 that is equipped with of external diameter opposite side of setting element, the pole-lifting head of setting element offsets with the hookup one side border of hasp, the transmission shaft external diameter between setting element and the hasp is equipped with hasp torsional spring 7, the one end of hasp torsional spring is fixed in the closure symmetry opposite side of hasp. The other end side of connecting piece is equipped with spacing groove 1101, and the flat keyway department of locking knob in the inner lock shell embolias fixedly to be equipped with shift fork 17, and the outside diameter one side arch of shift fork is equipped with special-shaped head 1701, and the special-shaped head of shift fork inserts the spacing groove of connecting piece, and through slide hole department screw fixation in the inner lock shell between the both ends of connecting piece, the screw department of connecting piece is equipped with shift fork torsional spring 16, and the one end of shift fork torsional spring offsets with the special-shaped head of shift fork outside diameter. The positioning piece torsional spring, the gasket 9, the positioning piece, the lock catch torsional spring, the lock catch, the separation blade 5 and the gasket 4 of the cab door lock are sequentially fixed on the outer diameter of the first handle inserted into the inner lock shell through the shaft retainer ring 3. The plane of the shaft hole on one side of the inner lock shell at one end of the lock catch is provided with a flat key groove, the flat key groove of the lock catch is sleeved with the step ring of the outer diameter of the end part of the first handle, and the end part of the lock hook at the other end of the lock catch is provided with a plane end.

The outer diameter of the turning arm head of the positioning piece is provided with a convex limiting head 803, the inner lock shell corresponding to the limiting head is provided with a limiting block 1201, the limiting head of the positioning piece is connected with the turning arm head to form a vertical included angle, the limiting head is fan-shaped, the end part of the limiting head is provided with an end edge protruding towards the inner lock shell, and one fixed end of the positioning piece torsional spring is positioned on the ring surface of the inner lock shell on one side between the limiting head and the lifting rod head. The lifting rod head and the crank arm head of the positioning piece are distributed at right angles by the axis, and the end part of the lifting rod head is protruded towards one side of the outer lock shell and is propped against the edge of the hooked side of the lock catch. The inner diameter of the central hole of the positioning piece is symmetrically provided with convex pin heads, the pin heads of the positioning piece are inserted into open slots at two sides of one end of the transmission shaft, and the positioning piece is connected with the first transmission shaft into a whole. The special-shaped head end part of the shifting fork is provided with a groove, the end part of the special-shaped head protrudes towards one side of the outer lock shell, a corresponding side groove is formed in the connecting piece below the groove, one end of a torsion spring of the shifting fork is fixed in the groove of the special-shaped head, and two ends of the side groove, corresponding to the limiting groove of the connecting piece, are shaped like a square groove. The one end of second handle is fixed in the handle hole of outer lock shell bottom through the handle retaining ring, and the second handle external diameter of handle retaining ring department is equipped with spacing piece 20, and spacing piece torsional spring sets up in the second handle external diameter of outer lock shell bottom, and the one end of spacing piece torsional spring is fixed in the drill way of outer lock shell bottom, and the other end of spacing piece torsional spring is fixed in spacing piece, and the U-shaped inslot of spacing piece one side is equipped with spacing post 101 in the outer lock shell bottom, and spacing post is the dicyclo. The external screw thread department of base is equipped with the nut, and the base is fixed in the outer lock shell through the nut, and the lock core axle is equipped with horizontal male spacer pin, and the spacer pin of lock core axle is located the arc wall of base.

The slide opening department of above-mentioned connecting piece is equipped with protruding limit, and the spacing groove one side of connecting piece is less than the protruding limit of connecting piece, and the setting element one side of connecting piece is less than the spacing groove one side of connecting piece, is equipped with arc chamfer limit between the protruding limit both sides of connecting piece and the setting element one side of connecting piece, the spacing groove one side, and the protruding limit symmetry opposite side locking knob one end of connecting piece is equipped with end limit groove 1102, end limit groove sets up in interior lock shell one side, be equipped with the clearance opening between the long limit groove in end limit groove and the minor face groove, the end limit groove length of connecting piece is greater than the protruding limit of connecting piece. The lock box symmetry opposite side of lock box subassembly is equipped with through fix with rivet's box seat 23, lock box and box seat junction are equipped with the U-shaped hole of box seat and the limit hole of box seat respectively, the U-shaped hole of box seat and the limit hole of box seat communicate with each other, the box seat is the L font, the box seat is equipped with the mounting hole, the downthehole gleitbretter 24 that is equipped with in limit hole of lock box, the gleitbretter passes through the screw mounting in the waist shape hole of box seat, the gleitbretter one side chimb that stretches out lock box department limit hole is equipped with interior hexagonal rivet, the gleitbretter is spacing in the. The gleitbretter department in the lock box is equipped with locking piece 25, and the locking piece is right triangle-shaped, and the one end of locking piece is fixed in the lock box and is located the swing of lock box through the round pin axle, and the hypotenuse of locking piece is towards the hasp.

The door suitable for the cab door lock is a sliding door, the cab door lock can be opened both outside and inside the door, the lock cylinder is arranged outside the door and needs to be opened by a key, and the locking knob is arranged inside the door and can be directly opened by hands. When the door is closed, the second handle is held to move the door to the side of the lock box assembly, and the lock catch directly buckles the lock box after the door is in place. When the door is opened, the knob or the lock cylinder needs to be locked to rotate to the opening position, then the first handle is pulled, the lock catch is separated from the lock box, and the door is opened. However, when the locking knob or the lock cylinder of the cab door lock is in the closed position, the second handle cannot rotate.

The working principle of the cab door lock is as follows: the locking knob, the lock cylinder and the shifting fork are in a linkage mode, and the shifting fork drives the connecting piece to move up and down; when the shifting fork drives the connecting piece to move upwards, the connecting piece is clamped between the positioning piece and the inner lock shell, and the positioning piece cannot rotate at the moment; meanwhile, the positioning piece is linked with the first handle and the second handle, so that the first handle and the second handle cannot rotate and are in a locking state. The lock catch is provided with round holes at the matching part of the transmission shaft and the first handle and the second handle, and meanwhile, the positioning piece is matched with the first handle and the second handle, so that the lock catch can rotate only when the positioning piece rotates, or rotates when the inclined plane of the hook part of the lock catch impacts the lock box.

Claims

1. A rail vehicle cab door lock is characterized in that an outer lock shell (1) and an inner lock shell (12) of the cab door lock are fixed on a door plate through screws (14), a second handle (21) of the outer lock shell and a first handle (13) of the inner lock shell are connected into a whole through a transmission shaft (2), a locking knob (15) is arranged below the first handle of the inner lock shell, the locking knob of the inner lock shell extends into a base (19) of the outer lock shell through a lock core shaft (18), and the end part of the lock core shaft in the base is of a square head; the door lock is characterized in that a lock catch (6) is arranged on the outer diameter of a transmission shaft (2) in an inner lock shell (12), one end of the lock catch is sleeved at the end part of a first handle (13) on the outer diameter of the transmission shaft, the other end of the lock catch extends out of a side surface hole of the inner lock shell and is provided with a lock hook, and the lock hook of the lock catch extends into a lock box assembly of a door frame and is hooked with a hook hole on one side of a lock box (22) of the lock box assembly; a positioning piece (8) is fixedly arranged on one side of the inner lock shell with the outer diameter of the transmission shaft, a crank arm head (801) is convexly arranged on one side of the outer diameter of the positioning piece, the crank arm head of the positioning piece is abutted against one end of a connecting piece (11), a positioning piece torsional spring (10) is arranged on the transmission shaft at the positioning piece, one end of the positioning piece torsional spring is fixed on the ring surface of the positioning piece, a lifting rod head (802) is convexly arranged on the other side of the outer diameter of the positioning piece, the lifting rod head of the positioning piece is abutted against the edge of one hooking side of the lock catch, a lock catch torsional spring (7) is arranged on the outer diameter of the transmission shaft between the positioning piece and the lock catch, and one end of the lock catch torsional spring is fixed on the other side of the lock catch; the other end side of connecting piece is equipped with spacing groove (1101), the flat keyway department of locking knob (15) embolias fixedly in the inner lock shell is equipped with shift fork (17), the outside diameter one side arch of shift fork is equipped with special-shaped head (1701), the special-shaped head of shift fork inserts the spacing groove of connecting piece, be fixed in the inner lock shell through slide hole department screw between the both ends of connecting piece, the screw department of connecting piece is equipped with shift fork torsional spring (16), the one end of shift fork torsional spring offsets with the special-shaped head of shift fork external diameter, the setting element torsional spring, packing ring (9), the setting element, the hasp torsional spring, the hasp, separation blade (5), gasket (4) are fixed in proper order through axle retaining ring (3) and are inserted the first handle external diameter of inner lock shell.

2. The rail vehicle cab door lock according to claim 1, wherein a protruding limiting head (803) is arranged at the outer diameter of a connecting lever head (801) of the positioning member (8), a limiting block (1201) is arranged on an inner lock shell (12) corresponding to the limiting head, the limiting head of the positioning member is connected with the connecting lever head to form a vertical included angle, the limiting head is fan-shaped, the end part of the limiting head is provided with an end edge protruding towards the inner lock shell, and a fixed end on one side of the positioning member torsion spring (10) is positioned on the ring surface of the inner lock shell on one side between the limiting head and the lever lifting head (802).

3. The door lock of the cab of the rail vehicle as claimed in claim 1, wherein the rod raising head (802) of the positioning member (8) and the crank arm head (801) are arranged at right angles from the axis, and the end of the rod raising head protrudes to one side of the outer lock case (1) and abuts against the edge of the hooked side of the lock catch (6).

4. The door lock of the cab of the railway vehicle as claimed in claim 1, wherein the locating piece (8) is symmetrically provided with raised pin heads in the inner diameter of the central hole, the pin heads of the locating piece are inserted into open slots at two sides of one end of the transmission shaft (2), and the locating piece is connected with the first transmission shaft into a whole.

5. The rail vehicle cab door lock according to claim 1, wherein a protruding edge is arranged at the slide hole of the connecting piece (11), one side edge of a limiting groove (1101) of the connecting piece is lower than the protruding edge of the connecting piece, one side edge of a positioning piece (8) of the connecting piece is lower than one side edge of the limiting groove of the connecting piece, an arc-shaped chamfered edge is arranged between two sides of the protruding edge of the connecting piece and one side edge of the positioning piece and one side edge of the limiting groove of the connecting piece, an end edge groove (1102) is arranged at one end of a locking knob (15) at the other symmetrical side of the protruding edge of the connecting piece, the end edge groove is arranged at one side of the inner lock shell (12), a gap opening is arranged between a long edge groove and a short edge groove of the end edge groove, and the length of the end edge groove of the connecting piece is greater than the protruding edge of the connecting piece.

6. The rail vehicle cab door lock according to claim 1, wherein a groove is formed in the end portion of the special-shaped head (1701) of the shifting fork (17), the end portion of the special-shaped head protrudes out of one side of the outer lock case (1), a corresponding side groove is formed in the connecting piece (11) below the groove, one end of the shifting fork torsion spring (16) is fixed to the groove of the special-shaped head, and the two ends of the side groove corresponding to the limiting groove (1101) of the connecting piece are shaped like a "< >".

7. The rail vehicle cab door lock according to claim 1, wherein one end of the second handle (21) is fixed in a handle hole at the bottom of the outer lock shell (1) through a handle retaining ring, a limiting piece (20) is arranged on the outer diameter of the second handle at the handle retaining ring, a limiting piece torsion spring is arranged on the outer diameter of the second handle at the bottom of the outer lock shell, one end of the limiting piece torsion spring is fixed in an orifice at the bottom of the outer lock shell, the other end of the limiting piece torsion spring is fixed on the limiting piece, a limiting column (101) is arranged at the bottom of the outer lock shell in a U-shaped orifice at one side of the limiting piece, and the limiting column is double-ring-shaped.

8. The rail vehicle cab door lock according to claim 1, wherein the base (19) is provided with a nut at an external thread, the base is fixed to the outer lock case (1) through the nut, the lock core shaft (18) is provided with a limiting pin which is inserted transversely, and the limiting pin of the lock core shaft is positioned in an arc-shaped groove of the base.

9. The door lock of the cab of the rail vehicle as claimed in claim 1, wherein the other symmetrical side of the lock box (22) of the lock box assembly is provided with a box seat (23) fixed by a rivet, the joint of the lock box and the box seat is provided with a U-shaped hole of the box seat and a side hole of the box seat respectively, the U-shaped hole of the box seat is communicated with the side hole of the box seat, the box seat is L-shaped, the box seat is provided with a mounting hole, a sliding piece (24) is arranged in the side hole of the lock box and is mounted in a waist-shaped hole of the box seat by a screw, a convex edge on one side of the sliding piece extending out of the side hole of the lock box is provided with an inner hexagonal rivet, and the sliding piece is limited in the side hole of the lock box by the convex edge.

10. The rail vehicle cab door lock according to claim 9, wherein a locking piece (25) is arranged at a sliding piece (24) in the lock box (22), the locking piece is in a right triangle shape, one end of the locking piece is fixed to the lock box through a pin shaft and is positioned in the lock box to swing, and the inclined edge of the locking piece faces the lock catch (6).