Locking device of a railway hopper car bottom door opening and closing mechanism

Abstract

The application provides a locking device of a railway hopper car bottom door opening and closing mechanism. The bottom door opening and closing mechanism comprises an upper transmission shaft which drives the opening and closing of the bottom door by rotating. The device comprises: one end of a transmission mechanism is arranged outside the side wall of the hopper car, and the other end of the transmission mechanism is provided with a stop block; the upper transmission shaft is provided with a position-fixed limiting piece; when the stop block interferes with the limiting piece by rotating the transmission mechanism, the upper transmission shaft cannot rotate, forming the locking state of the bottom door opening and closing mechanism; when the stop block is away from the limiting piece by rotating the transmission mechanism, the upper transmission shaft can rotate, forming the unlocking state of the bottom door opening and closing mechanism. The technical scheme of the application has the beneficial effect that only by rotating the handle of the transmission mechanism outside the car to make the stop block interfere with the limiting piece on the upper transmission shaft which drives the opening and closing of the bottom door, the locking or unlocking state of the hopper car bottom door opening and closing mechanism is formed, the staff can directly operate outside the car without getting on the car, and the unloading efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of railway freight cars, and more particularly, relates to a locking device for an opening and closing mechanism of a bottom door of a railway hopper car. Background Art

[0002] The locking device of the existing railway hopper car bottom door opening and closing mechanism is located above the vehicle floor. When opening and closing the bottom door, workers need to get on the vehicle to operate the locking device. In some companies, since the lines at the unloading site are high above the ground, it is very inconvenient for workers to get on and off the vehicle, which reduces unloading efficiency and increases labor intensity.

[0003] Therefore, a locking device for the opening and closing mechanism of the bottom door of a railway hopper car is designed, which can enable workers to operate the door without getting on the car, thereby solving the problem that the existing locking device requires workers to get on the car to operate the door. Summary of the Invention

[0004] The purpose of the present invention is to address the problems existing in the prior art and provide a locking device for the opening and closing mechanism of the bottom door of a railway hopper car. One end of the transmission mechanism of the locking device is arranged on the outside of the side wall of the hopper car and is connected to a handle, and the other end is provided with a block. It is only necessary to turn the handle outside the car so that the block can interfere with the limit piece on the upper transmission shaft that drives the bottom door to open and close, thereby forming a locked or unlocked state of the opening and closing mechanism of the bottom door of the hopper car, so that the staff can operate directly outside the car without getting on the car, thereby improving the unloading efficiency.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A locking device for a bottom door opening and closing mechanism of a railway hopper car, wherein the bottom door opening and closing mechanism includes an upper transmission shaft, and the upper transmission shaft drives the bottom door to open and close by rotating. The locking device includes:

[0007] A transmission mechanism, one end of which is arranged on the outside of the side wall of the hopper car, and the other end of which is provided with a stopper;

[0008] The upper transmission shaft is provided with a fixed position limiter. When the transmission mechanism is rotated so that the block interferes with the limiter, the upper transmission shaft cannot rotate, forming a locked state of the bottom door opening and closing mechanism; and when the transmission mechanism is rotated so that the block is away from the limiter, the upper transmission shaft can rotate, forming an unlocked state of the bottom door opening and closing mechanism.

[0009] Preferably, the transmission mechanism includes:

[0010] A hollow shaft and a solid shaft that are fixedly connected, and a first support and a second support that are fixedly arranged on the floor surface of the hopper car;

[0011] The hollow shaft passes through the first support and is hinged to the first support, and the end of the hollow shaft extends out of the side wall of the hopper car and is connected to a handle;

[0012] The solid shaft passes through the second support and is hinged to the second support. The stopper is connected to the solid shaft and rotates within the space defined by the second support.

[0013] Preferably, the second support includes a pair of vertical plates arranged opposite to each other, a connecting plate is provided between the vertical plates, and a protrusion is provided on the vertical plates. The protrusion is located above the connecting plate, and the protrusion abuts against the stopper and limits the rotation range of the stopper.

[0014] Preferably, the stopper is provided between the vertical plates, and the stopper comprises:

[0015] a column, wherein a first baffle is provided on the column, and the first baffle is capable of abutting against the protrusion;

[0016] A second baffle is provided at one end of the column close to the limiting member, the first baffle and the second baffle are provided on the same side, and the second baffle is used to block the limiting member when the first baffle abuts against the protrusion.

[0017] Preferably, the column is a hollow structure, a first pin hole is provided on the column, a second pin hole corresponding to the first pin hole is provided on the solid shaft, and the solid shaft passes through the column and is pinned and fixed to the stopper.

[0018] Preferably, the limiting member includes a sleeve and a protrusion, the sleeve is sleeved on the upper transmission shaft and connected to the upper transmission shaft flat key, the protrusion is a sheet-like structure, the end of the protrusion extends toward the stop block, and can interfere with the second baffle when the stop block abuts against the protrusion.

[0019] Preferably, the solid shaft comprises:

[0020] A first shaft and a second shaft are connected to each other, wherein the diameter of the first shaft is smaller than that of the second shaft, a third pin hole is provided on the first shaft, and the first shaft is fixed in the hollow shaft by pinning through the third pin hole.

[0021] Preferably, the end of the second shaft away from the first shaft is provided with two spherical grooves, the second support is provided with ball positioning grooves adapted to the spherical grooves, and the ball positioning grooves are provided with springs and balls.

[0022] Preferably, the handle is welded to the hollow shaft.

[0023] Preferably, there is a clearance fit between the hollow shaft and the first support, and between the solid shaft and the second support.

[0024] The beneficial effects of the technical solution of the present invention are:

[0025] The locking device only needs to rotate the handle of the transmission mechanism outside the car so that the block can interfere with the limit piece on the upper transmission shaft that drives the bottom door to open and close, forming a locked or unlocked state of the hopper car's bottom door opening and closing mechanism, so that the staff can operate directly outside the car without getting on the car, thereby improving the unloading efficiency.

[0026] The locking device has a simple and reliable structure and is easy to assemble. The hollow shaft, the solid shaft and the stopper are connected by inserting round pins, which reduces the manufacturing precision requirements for the shaft.

[0027] The block of the locking device is a gravity eccentric structure when in the locked and unlocked positions. The solid shaft end and the support are designed with a ball positioning structure to prevent the block from malfunctioning due to unexpected factors such as vehicle vibration.

[0028] The transmission mechanism of the locking device adopts a hollow shaft plus a solid shaft structure, which effectively reduces the deadweight; the shaft and the support adopt a clearance fit to facilitate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0030] Figure 1 A schematic structural diagram of a locking device for a railway hopper car bottom door opening and closing mechanism according to the present invention is shown;

[0031] Figure 2 A schematic diagram showing a locking device of a railway hopper car bottom door opening and closing mechanism according to the present invention located outside the hopper car side wall;

[0032] Figure 3a A cross-sectional schematic diagram of a locking device of a railway hopper car bottom door opening and closing mechanism according to the present invention is shown in a locked state;

[0033] Figure 3b A cross-sectional schematic diagram of a locking device of a railway hopper car bottom door opening and closing mechanism according to the present invention is shown in an unlocked state;

[0034] Figure 4 A front view of a second support of a locking device of an opening and closing mechanism for a bottom door of a railway hopper car according to the present invention is shown;

[0035] Figure 5 A front view of a first support of a locking device of an opening and closing mechanism for a bottom door of a railway hopper car according to the present invention is shown;

[0036] Figure 6 A schematic diagram showing the connection between the hollow shaft and the first support of the locking device of the railway hopper car bottom door opening and closing mechanism of the present invention is shown;

[0037] Figure 7 A schematic diagram showing the connection between the solid shaft, the hollow shaft and the second support of the locking device of the railway hopper car bottom door opening and closing mechanism of the present invention is shown;

[0038] Figure 8 A front view of a stopper of a locking device of an opening and closing mechanism of a railway hopper car bottom door according to the present invention is shown;

[0039] Figure 9 A front view of a limiting member of a locking device of an opening and closing mechanism of a railway hopper car bottom door according to the present invention is shown;

[0040] Figure 10 A front view of a solid shaft of a locking device of an opening and closing mechanism of a railway hopper car bottom door according to the present invention is shown;

[0041] Figure 11 The invention shows a structural schematic diagram of a locking device of a railway hopper car bottom door opening and closing mechanism using ball positioning.

[0042] Description of reference numerals:

[0043] 1. Upper transmission shaft; 2. Transmission mechanism; 21. Hollow shaft; 22. Solid shaft; 221. Second pin hole; 222. First shaft; 223. Second shaft; 224. Third pin hole; 225. Spherical groove; 23. First support; 24. Second support; 241. Vertical plate; 242. Connecting plate; 243. Protrusion; 244. Ball positioning groove; 245. Spring; 246. Ball; 25. Handle; 3. Stopper; 31. Column; 32. First baffle; 33. Second baffle; 34. First pin hole; 4. Limiting member; 41. Sleeve; 42. Raised portion. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0045] Reference Figure 1 As shown, the present invention provides a locking device for the bottom door opening and closing mechanism of a railway hopper car. The bottom door opening and closing structure includes an upper transmission shaft 1, which drives the bottom door to open and close by rotating. The locking device includes:

[0046] A transmission mechanism 2, one end of the transmission mechanism 2 is arranged on the outside of the side wall of the hopper car, and a stopper 3 is provided at the other end of the transmission mechanism 2;

[0047] The upper transmission shaft 1 is provided with a fixed position limiter 4. When the transmission mechanism 2 is rotated to cause the stopper 3 to interfere with the limiter 4, the upper transmission shaft 1 cannot rotate, forming a locked state of the bottom door opening and closing mechanism; and when the transmission mechanism 2 is rotated to cause the stopper 3 to move away from the limiter 4, the upper transmission shaft 1 can rotate, forming an unlocked state of the bottom door opening and closing mechanism.

[0048] Specifically, such as Figure 2 As shown, one end of the transmission mechanism 2 of the locking device is set on the outside of the side wall of the hopper car and is connected to a handle 25. The other end of the transmission mechanism 2 is provided with a stopper 3. It is only necessary to rotate the handle 25 outside the car so that the stopper 3 can interfere with the limiter 4 on the upper transmission shaft 1 that drives the bottom door to open and close. The upper transmission shaft 1 cannot rotate, forming a locked state of the bottom door opening and closing mechanism. Figure 3a Turn the handle 25 in the opposite direction to rotate the stopper 3 to the lower oblique position on the opposite side, avoiding the front end of the limiter 4, and the upper transmission shaft 1 can rotate to form the unlocked state of the bottom door opening and closing mechanism, as shown. Figure 3b As shown, the workers can open and close the bottom door of the railway hopper car directly outside the car without getting on the car, which reduces the labor intensity of the workers and improves the unloading efficiency.

[0049] Furthermore, the limiting member 4 is mounted on the upper transmission shaft 1 via a flat key, which has a simple structure and is easy to process.

[0050] Optionally, the transmission mechanism 2 includes:

[0051] A hollow shaft 21 and a solid shaft 22 are fixedly connected, and a first support 23 and a second support 24 are fixedly arranged on the floor surface of the hopper car;

[0052] The hollow shaft 21 passes through the first support 23 and is hinged to the first support 23. The end of the hollow shaft 21 extends out of the side wall of the hopper car and is connected to a handle 25.

[0053] The solid shaft 22 passes through the second support 24 and is hinged to the second support 24 . The stopper 3 is connected to the solid shaft 22 and rotates within the space defined by the second support 24 .

[0054] Specifically, the bottoms of the first support 23 and the second support 24 are welded to the floor of the hopper car, and the first support 23 and the second support 24 are arranged in parallel so that the pin holes of the first support 23 and the second support 24 are on the same axis. Figure 4-7As shown, during installation, hollow shaft 21 is hinged within the pinhole of first support 23, with the other end of hollow shaft 21 secured to the end of solid shaft 22. Both ends of solid shaft 22 are hinged within the pinholes of second support 24, with stopper 3 fitted over solid shaft 22 and secured to the shaft. Rotating the fixedly connected hollow shaft 21 and solid shaft 22 drives stopper 3 within the space defined by second support 24, interfering with stopper 4 on upper transmission shaft 1. This locking device is not limited to a two-support configuration; additional supports can also be used to enhance the stability of torque transmission.

[0055] Optional, see Figure 4 As shown, the second support 24 includes a pair of vertical plates 241 arranged opposite to each other, a connecting plate 242 is provided between the vertical plates 241, a protrusion 243 is provided on the vertical plates 241, the protrusion 243 is located above the connecting plate 242, and the protrusion 243 abuts against the stopper 3 and limits the rotation range of the stopper 3.

[0056] Specifically, the protrusion 243 provided on the second support 24 abuts against both sides of the stopper 3, so that the stopper 3 fixed to the solid shaft 22 can only rotate within a certain angular range, thereby acting as a limiter. Furthermore, the protrusion 243 can be fixed to the second support 24 by a threaded connection. The position of the protrusion 243 on the second support 24 can be adjusted according to actual conditions to rotate the stopper 3 to an optimal position, such as a horizontal position, to block the front end of the limiter 4 with the largest area, thereby preventing the stopper 3 and the limiter 4 from slipping due to excessive torque on the upper transmission shaft 1.

[0057] Optional, see Figure 8 As shown, the stopper 3 is arranged between the vertical plates 241, and the stopper 3 includes:

[0058] A column 31 is provided with a first baffle 32 , and the first baffle 32 can abut against the protrusion 243 ;

[0059] A second baffle 33 is provided at one end of the column 31 close to the limiting member 4 . The first baffle 32 and the second baffle 33 are provided on the same side. The second baffle 33 is used to block the limiting member 4 when the first baffle 32 abuts against the protrusion 243 .

[0060] Specifically, the first baffle 32 has a trapezoidal structure, so that when the first baffle 32 abuts the protrusion 243, it completely covers the protrusion 243. The first baffle 32 and the second baffle 33 are arranged on the same side of the column 31 and are arranged perpendicular to each other. This eccentric gravity structure ensures that the entire gravity is biased to one side when the stopper 3 is in the locked and unlocked positions, effectively preventing malfunction of the stopper 3 due to unexpected factors such as vehicle vibration.

[0061] Optional, see Figure 7 and Figure 8As shown, the column 31 is a hollow structure with a first pin hole 34 provided on the column. The solid shaft 22 is provided with a second pin hole 221 corresponding to the first pin hole 34 . The solid shaft 22 passes through the column 31 and is pinned and fixed to the stopper 4 .

[0062] Specifically, the column 31 of the stopper 3 is a hollow structure, and the solid shaft 22 passes through the column 31. The first pin hole 34 of the stopper 3 and the second pin hole 221 of the solid shaft 22 are aligned, and are fixed by inserting a round pin. The structure is simple and easy to assemble. At the same time, it also reduces the manufacturing accuracy requirements for the shaft and reduces production costs.

[0063] Optional, see Figure 9 As shown, the limit member 4 includes a sleeve 41 and a protrusion 42. The sleeve 41 is sleeved on the upper transmission shaft 1 and connected to the upper transmission shaft 1 with a flat key. The protrusion 42 is a sheet-like structure. The end of the protrusion 42 extends toward the stop block 3 and can interfere with the second baffle 33 when the stop block 3 abuts against the protrusion 243.

[0064] Specifically, the limit member 4 is provided with a keyway, which is connected to the upper transmission shaft 1 with a flat key to transmit torque. The second baffle 33 of the block 3 blocks the raised portion 42 of the limit member 4 to eliminate the torque of the upper transmission shaft 1, so that the upper transmission shaft 1 cannot rotate, thereby realizing the locked state of the bottom door opening and closing mechanism.

[0065] Optional, see Figure 7 and Figure 10 As shown, the solid shaft 22 comprises:

[0066] The first shaft 222 and the second shaft 223 are connected to each other. The diameter of the first shaft 222 is smaller than that of the second shaft 223 . The first shaft 222 is provided with a third pin hole 224 . The first shaft 222 is pinned and fixed in the hollow shaft 21 through the third pin hole 224 .

[0067] Specifically, the solid shaft 22 is composed of two sections, a first shaft 222 and a second shaft 223, which are connected to each other. A third pin hole 224 is provided on the first shaft 222. The solid shaft 22 is processed so that the diameter of the first shaft 222 is smaller than the diameter of the second shaft 223, which facilitates the insertion of the first shaft 222 of the solid shaft 22 into the hollow shaft 21 and is fixed by pinning with inserted round pins, thereby reducing the manufacturing precision requirements for the shaft and reducing production costs.

[0068] Furthermore, the locking device adopts a structure of a long-rod hollow shaft 21 and a short-rod solid shaft 22 , which effectively reduces the deadweight of the transmission mechanism 2 .

[0069] Optional, see Figure 10 and Figure 11As shown, two spherical grooves 225 are provided at the end of the second shaft 223 away from the first shaft 222, and a ball positioning groove 244 adapted to the spherical groove 225 is provided on the second support 24, and a spring 245 and a ball 246 are provided in the ball positioning groove 244.

[0070] Specifically, a ball positioning structure is designed at the end of the solid shaft 22. When the block 3 of the locking device is in the locked and unlocked positions, the ball 246 is snapped into the spherical groove 225 for positioning, thereby avoiding malfunction of the block 3 due to unexpected factors such as vehicle vibration.

[0071] Optional, see Figure 6 As shown, the handle 25 is welded to the hollow shaft 21 .

[0072] Specifically, the handle 25 may be connected to the hollow shaft 21 by screwing to facilitate disassembly.

[0073] Optionally, there is a clearance fit between the hollow shaft 21 and the first support 23 , and between the solid shaft 22 and the second support 24 .

[0074] Specifically, a clearance fit is adopted between the shaft and the support to facilitate assembly.

[0075] Example

[0076] Reference Figures 1-11 As shown, this embodiment provides a locking device for the bottom door opening and closing mechanism of a railway hopper car. The bottom door opening and closing structure includes an upper transmission shaft 1, which drives the bottom door to open and close by rotating. The locking device includes:

[0077] A transmission mechanism 2, one end of the transmission mechanism 2 is arranged on the outside of the side wall of the hopper car, and a stopper 3 is provided at the other end of the transmission mechanism 2;

[0078] The upper transmission shaft 1 is provided with a fixed position limiter 4. When the transmission mechanism 2 is rotated to cause the stopper 3 to interfere with the limiter 4, the upper transmission shaft 1 cannot rotate, forming a locked state of the bottom door opening and closing mechanism; and when the transmission mechanism 2 is rotated to cause the stopper 3 to move away from the limiter 4, the upper transmission shaft 1 can rotate, forming an unlocked state of the bottom door opening and closing mechanism.

[0079] In this embodiment, the transmission mechanism 2 includes:

[0080] A hollow shaft 21 and a solid shaft 22 are fixedly connected, and a first support 23 and a second support 24 are fixedly arranged on the floor surface of the hopper car;

[0081] The hollow shaft 21 passes through the first support 23 and is hinged to the first support 23. The end of the hollow shaft 21 extends out of the side wall of the hopper car and is connected to a handle 25.

[0082] The solid shaft 22 passes through the second support 24 and is hinged to the second support 24 . The stopper 3 is connected to the solid shaft 22 and rotates within the space defined by the second support 24 .

[0083] In this embodiment, the second support 24 includes a pair of vertical plates 241 arranged opposite to each other, a connecting plate 242 is provided between the vertical plates 241, a protrusion 243 is provided on the vertical plates 241, the protrusion 243 is located above the connecting plate 242, and the protrusion 243 abuts against the stopper 3 and limits the rotation range of the stopper 3.

[0084] In this embodiment, the stopper 3 is provided between the vertical plates 241 and includes:

[0085] A column 31 is provided with a first baffle 32 , and the first baffle 32 can abut against the protrusion 243 ;

[0086] A second baffle 33 is provided at one end of the column 31 close to the limiting member 4 . The first baffle 32 and the second baffle 33 are provided on the same side. The second baffle 33 is used to block the limiting member 4 when the first baffle 32 abuts against the protrusion 243 .

[0087] In this embodiment, the column 31 is a hollow structure with a first pin hole 34 provided on the column. The solid shaft 22 is provided with a second pin hole 221 corresponding to the first pin hole 34 . The solid shaft 22 passes through the column 31 and is pinned to the stopper 4 .

[0088] In this embodiment, the limit member 4 includes a sleeve 41 and a protrusion 42. The sleeve 41 is sleeved on the upper transmission shaft 1 and connected to the upper transmission shaft 1 with a flat key. The protrusion 42 is a sheet-like structure. The end of the protrusion 42 extends toward the stop block 3 and can interfere with the second baffle 33 when the stop block 3 abuts against the protrusion 243.

[0089] In this embodiment, the solid shaft 22 includes:

[0090] The first shaft 222 and the second shaft 223 are connected to each other. The diameter of the first shaft 222 is smaller than that of the second shaft 223 . The first shaft 222 is provided with a third pin hole 224 . The first shaft 222 is pinned and fixed in the hollow shaft 21 through the third pin hole 224 .

[0091] In this embodiment, two spherical grooves 225 are provided at the end of the second shaft 223 away from the first shaft 222, and a ball positioning groove 244 adapted to the spherical groove 225 is provided on the second support 24, and a spring 245 and a ball 246 are provided in the ball positioning groove 244.

[0092] In this embodiment, the handle 25 is welded to the hollow shaft 21 .

[0093] In this embodiment, there is a clearance fit between the hollow shaft 21 and the first support 23 , and between the solid shaft 22 and the second support 24 .

[0094] To sum up, the locking device has a simple and reliable structure, is easy to assemble and has strong practicality. It only requires rotating the handle of the transmission mechanism outside the car so that the block can interfere with the limit piece on the upper transmission shaft that drives the bottom door to open and close, thereby forming a locked or unlocked state of the hopper car bottom door opening and closing mechanism, so that the staff can open and close the hopper car bottom door directly outside the car without getting on the car, reducing the labor intensity of the staff and improving the unloading efficiency.

[0095] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A locking device for a bottom door opening and closing mechanism of a railway hopper car, wherein the bottom door opening and closing mechanism comprises an upper transmission shaft, which drives the bottom door to open and close by rotating, characterized in that: The locking device comprises: A transmission mechanism, one end of which is arranged on the outside of the side wall of the hopper car, and the other end of which is provided with a stopper; The upper transmission shaft is provided with a fixed position limiter. When the transmission mechanism is rotated so that the stopper interferes with the limiter, the upper transmission shaft cannot rotate, thereby forming a locked state of the bottom door opening and closing mechanism. When the transmission mechanism is rotated so that the stopper moves away from the limiter, the upper transmission shaft can rotate, thereby forming an unlocked state of the bottom door opening and closing mechanism. The transmission mechanism comprises: A hollow shaft and a solid shaft that are fixedly connected, and a first support and a second support that are fixedly arranged on the floor surface of the hopper car; The hollow shaft passes through the first support and is hinged to the first support, and the end of the hollow shaft extends out of the side wall of the hopper car and is connected to a handle; The solid shaft passes through the second support and is hinged to the second support, and the stopper is connected to the solid shaft and rotates within the space defined by the second support; The second support includes a pair of vertical plates arranged opposite to each other, a connecting plate is provided between the vertical plates, and a protrusion is provided on the vertical plates, the protrusion is located above the connecting plate, the protrusion abuts against the stopper and limits the rotation range of the stopper; The stopper is arranged between the vertical plates, and the stopper comprises: a column, wherein a first baffle is provided on the column, and the first baffle is capable of abutting against the protrusion; A second baffle is provided at one end of the column close to the limiting member, the first baffle and the second baffle are provided on the same side, and the second baffle is used to block the limiting member when the first baffle abuts against the protrusion.

2. The locking device according to claim 1, characterized in that: The column is a hollow structure, a first pin hole is provided on the column, a second pin hole corresponding to the first pin hole is provided on the solid shaft, and the solid shaft passes through the column and is fixed to the stopper by pinning.

3. The locking device according to claim 1, characterized in that: The limiting member includes a sleeve and a protrusion. The sleeve is sleeved on the upper transmission shaft and connected to the upper transmission shaft flat key. The protrusion is a sheet-like structure. The end of the protrusion extends toward the stop block and can interfere with the second baffle when the stop block abuts against the protrusion.

4. The locking device according to claim 1, wherein: The solid shaft comprises: A first shaft and a second shaft are connected to each other, wherein the diameter of the first shaft is smaller than that of the second shaft, a third pin hole is provided on the first shaft, and the first shaft is fixed in the hollow shaft by pinning through the third pin hole.

5. The locking device according to claim 4, characterized in that: The end of the second shaft away from the first shaft is provided with two spherical grooves, the second support is provided with ball positioning grooves adapted to the spherical grooves, and the ball positioning grooves are provided with springs and balls.

6. The locking device according to claim 1, wherein: The handle is welded to the hollow shaft.

7. The locking device according to claim 1, characterized in that: The hollow shaft and the first support are clearance-fitted with each other, as are the solid shaft and the second support.

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