CN116461591B

CN116461591B - Double-wheel transfer vehicle with parking automatic braking mechanism

Info

Publication number: CN116461591B
Application number: CN202210303103.XA
Authority: CN
Inventors: 郭磊; 戴宗妙; 刘琰; 陆银; 潘魁
Original assignee: 713th Research Institute of CSIC
Current assignee: 713th Research Institute of CSIC
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2025-09-16
Anticipated expiration: 2042-03-24
Also published as: CN116461591A

Abstract

The invention provides a double-wheel transfer trolley with a parking automatic braking mechanism, which comprises a trolley frame and two wheels, wherein a traction handle rod is arranged at the front end of the trolley frame, a braking piece is arranged at the front side of the wheels, the upper end of the braking piece is hinged to the trolley frame, a braking surface is arranged at the rear side of the braking piece, the front side of the braking piece is provided with a braking rod, the braking rod comprises an inclined rod body, the upper end of the rod body is hinged to the trolley frame, a limiting rod and a push rod are arranged at the upper end of the rod body, a baffle matched with the limiting rod in a blocking manner is fixed on the trolley frame, the push rod is used for pushing against the braking piece after rotating along with the rod body, and the double-wheel transfer trolley further comprises a first elastic piece arranged between the braking piece and the trolley frame. When the vehicle is required to be parked or stored at a certain position, the traction handle rod is directly lowered, the lower end of the brake rod body is in contact with the ground, the rod body rotates, the ejector rod pushes the brake part backwards, the braking function is achieved, namely, the traction handle rod is lowered to achieve automatic parking braking, the use is very convenient, extra operation is not required, and danger is avoided because the brake is forgotten.

Description

Double-wheel transfer vehicle with parking automatic braking mechanism

Technical Field

The invention relates to the technical field of transfer vehicles, in particular to a double-wheel transfer vehicle with a parking automatic braking mechanism.

Background

The double round transfer car (buggy) is used as simple and easy transfer equipment in all kinds of enterprises and mill often, and for example, the patent document that the bulletin number of authorizing is CN208322031U discloses a transfer car (buggy) for centrifugal casting process, including the frame with install two wheels on the frame, the front end of frame is provided with the traction barre, conveniently removes the transfer car (buggy), and the front end of frame still is provided with the landing leg simultaneously, conveniently supports the transfer car (buggy) subaerial.

In use, when the transfer vehicle is parked or stored in a place, in order to prevent the transfer vehicle from moving accidentally, it is often necessary to implement braking by an additional operation, such as placing a barrier, such as a brick or a skid, in front of and behind the wheels, or tying the transfer vehicle with a rope, a chain, etc., which is troublesome to operate, and which is easily dangerous once the operator forgets to brake.

Disclosure of Invention

The invention aims to provide a double-wheel transfer vehicle with a parking automatic braking mechanism, which solves the problems that in the prior art, the operation is troublesome because the braking is realized through additional operation and the danger is easy to cause once the braking is forgotten.

In order to achieve the above purpose, the two-wheel transfer vehicle with the automatic parking brake mechanism adopts the following technical scheme:

The double-wheel transfer vehicle with the automatic parking brake mechanism comprises a vehicle frame and two wheels arranged on the vehicle frame, wherein a traction handle rod is arranged at the front end of the vehicle frame, the double-wheel transfer vehicle further comprises a brake piece arranged at the front side of the wheels for braking the wheels, the upper end of the brake piece is hinged on the vehicle frame through a first hinge shaft, a brake surface used for being in pressing contact with the wheels is arranged at the rear side of the brake piece, the double-wheel transfer vehicle further comprises a brake rod arranged at the front side of the brake piece, the brake rod comprises a rod body which is gradually inclined downwards from back to front, the upper end of the rod body is hinged on the vehicle frame through a second hinge shaft, the lower end of the rod body is used for being supported on the ground when the traction handle rod is placed down, the brake rod further comprises a limit rod arranged at the upper end of the rod body, a baffle plate which is fixedly arranged at the front side of the rod body and is in stopping fit with the rotated limit rod when the traction handle rod is lifted up, so as to avoid the lower end of the rod body to be in contact with the ground, the brake rod body further comprises a push rod arranged at the upper end of the rod body and is used for being pressed against the brake piece along with the brake piece after rotation, so that the brake piece rotates around the axis of the first hinge shaft and gradually inclines downwards, the upper end of the rod body is used for being in pressing contact with the wheels, and elastic deformation piece is provided between the wheels and the brake piece and the first compression wheel and the brake piece when the wheel is elastically contacted with the brake piece when the wheel is in a compression device and the reset device.

The double-wheel transfer trolley has the beneficial effects that the double-wheel transfer trolley comprises the braking part, the braking rod and the first elastic part, the upper end of the braking part is hinged on the trolley frame through the first hinge shaft, and the rear side of the braking part is provided with the braking surface for pressing contact with the wheels, so that the braking surface can be pressed contact with the wheels when the braking part rotates backwards around the axis of the first hinge shaft, and the braking effect is achieved by means of friction force. The upper end of the brake lever body is hinged on the frame through the second hinge shaft, and the lower end is used for supporting on the ground when the traction handle rod is lowered, because the front end of the frame moves downwards when the traction handle rod is lowered, and therefore the lower end of the brake lever body can finally contact the ground.

The brake lever is still including setting up the gag lever post in the body of rod upper end, be fixed with the baffle that is located the gag lever post front side on the frame simultaneously, pull the barre when lifting on, the front end of frame shifts up, the lower extreme of the body of rod leaves ground, the body of rod can rotate around the axis of second articulated shaft, drive the gag lever post and forward rotate, and baffle and the cooperation of gag lever post stop can restrict the turned angle of gag lever post, avoid the lower extreme of the body of rod to rotate excessively and contact ground, and then avoid producing the hindrance to the normal travel of transfer car (buggy).

The brake lever further comprises a push rod arranged at the upper end of the lever body, when the traction handle lever is lowered, the front end of the frame moves downwards, the lower end of the lever body contacts the ground, the lever body is forced to rotate around the axis of the second hinge shaft, and accordingly the push rod is driven to rotate backwards, the push rod pushes the brake piece, and the brake piece is further enabled to rotate around the axis of the first hinge shaft and be in compression contact with the wheels, so that a brake function is achieved. The first elastic piece is installed between the braking piece and the frame, when the braking piece is pressed and contacted with the wheels, the first elastic piece is stressed to deform, and reset power can be provided for resetting the braking piece when the ejector rod is separated from the braking piece, so that the braking piece can be conveniently reset in time, and braking is relieved.

In summary, when the transfer vehicle is used, the brake rod is not contacted with the ground in the process of normally lifting the traction handle rod to pull the transfer vehicle to run, the brake piece is not contacted with the wheels, when the vehicle is required to be parked or stored at a certain position, the traction handle rod is directly lowered, the lower end of the rod body of the brake rod is contacted with the ground, and the rod body rotates, so that the ejector rod pushes the brake piece backwards, and a braking function is realized. That is, the transfer vehicle can realize the function of parking automatic braking only by normally putting down the traction handle bar, is very convenient to use, does not need additional operation, and does not worry about danger caused by forgetting to brake.

Further, the upper end of the rod body is provided with a sleeve, and the ejector rod is in threaded connection with the sleeve.

The technical scheme has the beneficial effects of being convenient for setting, dismounting and adjusting the ejector rod.

Further, the front end and the rear end of the ejector rod are exposed out of the sleeve, the rear end of the ejector rod is used for ejecting the brake piece, a compression nut used for compressing the front end face of the sleeve is connected to the outer thread of the ejector rod, a threaded hole is formed in the front end of the ejector rod, and the limiting rod is a limiting bolt connected to the front end of the ejector rod in a threaded mode.

The technical scheme has the advantages that the compression nut can limit the position of the ejector rod and ensure the adjusting effect of the ejector rod, the front end of the ejector rod is provided with the threaded hole, and the limiting rod is a limiting bolt in threaded connection with the front end of the ejector rod, so that the limiting rod is convenient to assemble, disassemble and adjust.

Further, the limit bolt is externally connected with a lock nut used for pressing the front end face of the ejector rod through threads.

The technical scheme has the beneficial effects that the lock nut can limit the position of the limit bolt and ensure the adjusting effect of the limit bolt.

Further, the brake lever also comprises a supporting table arranged at the lower end of the lever body, the supporting table is provided with an upward supporting surface, and the frame is connected with a supporting rod used for supporting the supporting surface.

The technical scheme has the beneficial effects that the supporting rod can be supported on the supporting table after the traction handle rod is lowered, a certain supporting effect is achieved, the auxiliary brake rod is used for sharing the weight of the vehicle, the stability of the vehicle is ensured, and the service life of the brake rod is prolonged.

Further, the lower end of the supporting rod is provided with a conical head, and the supporting surface is provided with a positioning hole matched with the conical head in a positioning way.

The technical scheme has the beneficial effects that the conical head is matched with the positioning hole on the supporting surface, so that the contact between the supporting rod and the supporting surface is facilitated, and the supporting is facilitated.

Further, be fixed with a fixed section of thick bamboo on the frame, branch includes pole portion and the head that is located pole portion lower extreme, and the external diameter of head is greater than the external diameter of pole portion, and pole portion passes a fixed section of thick bamboo, and pole portion cover is equipped with the second elastic component, and the upper end roof pressure of second elastic component is on a fixed section of thick bamboo, and the lower extreme roof pressure is on the head.

The technical scheme has the advantages that the supporting rod comprises the rod part and the head part, the second elastic piece is conveniently sleeved, the upper end of the second elastic piece is propped against the fixed cylinder, the lower end of the second elastic piece is propped against the head part, when the load is heavy, the supporting rod can play a role in buffering a brake of the transfer trolley, safety during braking is improved, and meanwhile the rod part penetrates through the fixed cylinder, so that the supporting rod is convenient to install.

Further, the rod part is provided with external threads, and a part of the rod part penetrating out of the fixed cylinder is connected with a fixed nut in a threaded manner.

The technical scheme has the beneficial effects that the external threads are matched with the fixing nuts, so that the support rod is convenient to install, detach and adjust.

Further, the first elastic member is a tension spring.

The tension spring has the beneficial effects of convenience in installation and good use effect.

Further, the braking piece comprises a braking plate and a braking plate fixed on the braking plate, the upper end of the braking plate is hinged on the frame through the first hinge shaft, the first elastic piece is connected to the braking plate, and the surface of the braking plate forms the braking surface.

The technical scheme has the beneficial effects that the braking piece comprises the braking plate and the braking sheet, so that the hinged installation of the braking piece and the connection with the first elastic piece can be facilitated, the setting of the braking surface is also facilitated, and the braking effect is ensured.

Drawings

FIG. 1 is a perspective view of a dual wheel transfer vehicle with an automatic parking brake mechanism of the present invention when the lift traction handle is normally running;

FIG. 2 is a side view of the dual wheel transfer vehicle with the automatic parking brake mechanism of the present invention when the pull handle bar is lifted for normal running;

FIG. 3 is a perspective view of a two-wheel transfer vehicle with a parking automatic brake mechanism of the present invention when the traction lever is lowered for automatic braking;

FIG. 4 is an enlarged view of a portion of FIG. 3;

fig. 5 is an assembly structure diagram of a brake lever, a push rod and a limit bolt of the double-wheel transfer vehicle with the parking automatic brake mechanism.

In the figure, 1, a traction handle rod; 2, a brake rod, 21, a rod body, 22, a sleeve, 23, a supporting table, 231, a supporting surface, 232, a positioning hole, 24, a copper sleeve, 3, a limit bolt, 31, a second outer hexagonal part, 4, a push rod, 41, a first outer hexagonal part, 5, a brake piece, 51, a brake plate, 52, a brake block, 6, a tension spring, 7, a wheel, 8, a support rod, 81, a rod part, 82, a head, 9, a frame, 91, a baffle plate, 92, a fixing cylinder, 93, a first hinge shaft, 94, a second hinge shaft, 10, a compression nut, 11, a lock nut, 12, a pressure spring, 13 and a fixing nut.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.

It is noted that relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without the further limitation of this, the term "includes an element defined by" and the like, it does not exclude that an additional identical element is present in a process, method, article or apparatus that comprises the element.

The features and capabilities of the present invention are described in further detail below in connection with the examples.

An embodiment of a two-wheel transfer vehicle with a parking automatic brake mechanism (hereinafter referred to as a two-wheel transfer vehicle) is shown in fig. 1, 2 and 3, the two-wheel transfer vehicle comprises a frame 9 and two wheels 7 arranged on the frame 9, a traction handle bar 1 is arranged at the front end of the frame 9, the traction handle bar 1 can be lifted to pull the whole two-wheel transfer vehicle to move (shown in fig. 1 and 2), the two-wheel transfer vehicle can be parked at a certain position by lowering the traction handle bar 1, and the parking automatic brake function (shown in fig. 3) is realized.

Specifically, the two-wheel transfer vehicle further comprises a brake member 5 disposed at the front side of the wheel 7 to brake the wheel 7, as shown in fig. 4, the brake member 5 comprises a brake plate 51 and a brake pad 52 fixed on the brake plate 51, the upper end of the brake plate 51 is hinged on the vehicle frame 9 through a first hinge shaft 93, and the surface of the brake pad 52, that is, the rear side surface of the brake pad 52 forms a braking surface for pressing contact with the wheel 7, so that when the brake member 5 rotates backwards around the axis of the first hinge shaft 93, the braking surface can be pressed contact with the wheel 7, and a braking effect is achieved by virtue of friction force, thereby realizing a parking braking function. The brake plate 51 and the brake pad 52 are arc-shaped, so that the braking surface is also arc-shaped, and the braking effect is ensured.

The two-wheel transfer vehicle further comprises a brake lever 2 located at the front side of the brake member 5, and as shown in fig. 4 and 5, the brake lever 2 comprises a lever body 21 gradually inclined downward from back to front, the upper end of the lever body 21 is hinged to the frame 9 through a second hinge shaft 94, in this embodiment, the second hinge shaft 94 is specifically a bolt, and the bolt is in threaded connection with the frame 9 after passing through the lever body 21. In order to facilitate the rotation of the brake lever 2, a through hole is provided at the upper end of the lever body 21, and a copper bush 24 is installed in the through hole, and the bolt penetrates the copper bush 24.

The lower end of the rod body 21 is used for supporting on the ground when the traction bar 1 is lowered, the center of gravity of the whole brake rod 2 is located at the front side of the second hinge shaft 94, when the traction bar 1 is lowered, the front end of the frame 9 moves downwards under the action of dead weight (or load), the lower end of the rod body 21 finally contacts the ground, and then the rod body 21 rotates around the axis of the second hinge shaft 94 (the view angle in fig. 2 is clockwise rotation). When the towing handle bar 1 is lifted, the front end of the frame 9 moves upward, the lower end of the bar body 21 leaves the ground, and the bar body 21 rotates about the axis of the second hinge shaft 94 (the view angle in fig. 2 is counterclockwise).

The brake lever 2 further comprises a push rod 4 arranged at the upper end of the lever body 21, when the traction handle 1 is lowered, the lower end of the lever body 21 contacts the ground and rotates, and the push rod 4 is pushed against the brake piece 5 after rotating along with the lever body 21, so that the brake piece 5 rotates and compresses the wheels 7, and a braking function is realized. Specifically, as shown in fig. 4 and 5, a sleeve 22 is disposed at the upper end of the rod body 21, the ejector rod 4 is in threaded connection with the sleeve 22, and both front and rear ends of the ejector rod 4 are exposed outside the sleeve 22, the rear end of the ejector rod 4 is used for pressing the brake member 5, for facilitating the pressing, friction force is reduced, and the rear end of the ejector rod 4 is provided with a ball structure for contacting with the brake member 5. The ejector rod 4 is externally connected with the compression nut 10 used for compressing the front end surface of the sleeve 22 in a threaded manner, so that the extension degree of the rear end of the ejector rod 4 can be adjusted, a proper braking effect can be adjusted, and the compression nut 10 can be used for locking after adjustment, so that the adjustment effect is ensured. To facilitate the rotation of the ejector pin 4, a first outer hexagonal portion 41 is provided at the front end of the ejector pin 4.

The two-wheel transfer trolley further comprises a first elastic piece, one end of the first elastic piece is connected to the brake plate 51, the other end of the first elastic piece is connected to the frame 9, as shown in fig. 2 and 4, the first elastic piece is a tension spring 6, when the brake piece 5 is pressed and contacts with the wheels 7, the tension spring 6 is pulled to deform, when the traction handle bar 1 is lifted, the brake bar 2 rotates, the ejector rod 4 is separated from the brake piece 5, the deformed tension spring 6 provides resetting power for resetting the brake piece 5, and the brake 5 is conveniently reset in time to release the brake.

The brake lever 2 still includes the gag lever post that sets up in body of rod 21 upper end, the front end of ejector pin 4 is provided with the screw hole, above-mentioned gag lever post is threaded connection at the stop bolt 3 of ejector pin 4 front end, consequently gag lever post and ejector pin 4 are coaxial, be fixed with the baffle 91 that is located stop bolt 3 front side on the frame 9, when the traction barre 1 lifts up, the lower extreme of body of rod 21 leaves ground, body of rod 21 rotates under the dead weight effect, drive stop bolt 3 forward rotation, and baffle 91 and stop cooperation of stop bolt 3, as shown in fig. 2, can restrict stop bolt 3's rotation angle, avoid the lower extreme of body of rod 21 to rotate excessively and contact ground, also the traction barre 1 is the ground-leaving in-process after lifting up all the time, avoid producing the hindrance to the normal travel of double round transfer car.

Of course, the extension length of the limit bolt 3 may be adjusted, so as to change the inclination degree of the rod body 21, and obtain the most suitable stopping effect. To facilitate rotation of the limit bolt 3, a second outer hexagonal portion 31 is provided on the limit bolt 3. Meanwhile, the limit bolt 3 is externally connected with a lock nut 11 for pressing the front end face of the ejector rod 4 in a threaded manner, and the lock nut 11 can be used for back death after adjustment, so that the adjustment effect is ensured.

As shown in fig. 5, the brake lever 2 further includes a supporting table 23 disposed at the lower end of the lever body 21, the supporting table 23 has an upward supporting surface 231, the frame 9 is connected with a supporting rod 8 for supporting the supporting surface 231, and the supporting rod 8 can be supported on the supporting table 23 after the traction handle 1 is lowered (shown in fig. 3 and 4), so as to play a certain supporting role, thereby assisting the brake lever 2 in sharing the weight of the vehicle, ensuring the stability of the vehicle and prolonging the service life of the brake lever.

Specifically, as shown in fig. 4, the supporting rod 8 includes a rod 81 and a head 82 located at the lower end of the rod 81, the head 82 is a conical head, the maximum outer diameter of the conical head is larger than the outer diameter of the rod 81, and a positioning hole 232 (shown in fig. 5) matched with the conical head in a positioning manner is formed in the supporting surface 231, so that contact between the supporting rod 8 and the supporting surface 231 is facilitated. The frame 9 is fixed with a fixed cylinder 92, the rod 81 passes through the fixed cylinder 92, the rod 81 is provided with external threads, and the part of the rod 81 passing through the fixed cylinder 92 is connected with a fixed nut 13 through threads. Meanwhile, the second elastic piece is sleeved outside the rod part 81, the second elastic piece is a pressure spring 12, the upper end of the pressure spring 12 is propped against the fixed cylinder 92, the lower end of the pressure spring is propped against the head 82, and when the bearing is heavy, the two-wheel transfer vehicle brake can be buffered, so that the safety during braking is improved. And, through adjusting fixation nut 13 can change the pretightning force of pressure spring 12, adjust the supporting and buffering effect.

When the double-wheel transfer vehicle is used, the brake rod 2 is not contacted with the ground and the brake piece 5 is not contacted with the wheels 7 in the process of normally lifting the traction handle rod 1 to pull the double-wheel transfer vehicle to run, as shown in fig. 1 and 2. When the vehicle is required to be parked or stored at a certain position, the traction handle bar 1 is directly lowered, the lower end of the bar body 21 of the brake bar 2 is contacted with the ground, and the bar body 21 rotates, so that the ejector rod 4 pushes the brake piece 5 backwards, and a braking function is realized, as shown in fig. 3 and 4. That is, the dual-wheel transfer vehicle can realize the function of parking automatic braking only by normally putting down the traction handle bar 1, is very convenient to use, does not need additional operation, and does not worry about danger caused by forgetting to brake.

In other embodiments of the dual wheel transfer vehicle with the automatic parking brake mechanism, the second hinge shaft is not a bolt, but a pin shaft, at this time, a copper sleeve is not required to be installed in a through hole at the upper end of the brake lever body, and the pin shaft directly passes through the through hole.

In other embodiments of the two-wheel transfer vehicle with automatic parking brake mechanism, the brake member is an integral brake plate, and the rear side of the brake plate directly serves as a braking surface to be in pressing contact with the wheels.

In other embodiments of the dual wheel transfer vehicle with the automatic parking brake mechanism, the first elastic member may also be a torsion spring, a rubber band, or a spring plate.

In other embodiments of the dual-wheel transfer vehicle with the automatic parking brake mechanism, the rod part of the supporting rod is not provided with external threads, no fixing nut is arranged at the moment, and the pin shaft or the elastic retainer ring is arranged after the rod part passes through the fixing cylinder to realize limit.

In other embodiments of the two-wheel transfer vehicle with the parking automatic brake mechanism, the second elastic member may also be a rubber sleeve.

In other embodiments of the two-wheel transfer vehicle with the automatic parking brake mechanism, the second elastic piece and the fixed cylinder are not required, and the supporting rod is directly welded and fixed on the vehicle frame.

In other embodiments of the dual wheel transfer vehicle with the automatic parking brake mechanism, the lower end of the supporting rod is not a conical head, the supporting rod is a cylindrical rod, the lower end face is a plane, no positioning holes are arranged on the supporting surface, and the supporting surface is directly contacted with the lower end face of the supporting rod.

In other embodiments of the two-wheel transfer vehicle with the parking automatic brake mechanism, the strut may not be provided, but rather the brake lever is used as the strut when the brake lever is in contact with the ground.

In other embodiments of the dual wheel transfer vehicle with the parking automatic brake mechanism, the lock nut may not be connected to the exterior of the limit bolt.

In other embodiments of the dual wheel transfer vehicle with the automatic parking brake mechanism, when the ejector rod is in threaded connection with the sleeve, the rear end of the ejector rod can not be exposed out of the sleeve, and the limiting rod can be directly in threaded connection with the front end of the sleeve.

In other embodiments of the dual wheel transfer vehicle with the automatic parking brake mechanism, a sleeve is not required, the ejector rod and the limiting rod are directly welded and fixed at the upper end of the rod body or integrally formed with the rod body, the ejector rod and the limiting rod can be different in axis, for example, can be parallel, and the limiting rod is positioned above the ejector rod.

The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-wheeled transport vehicle with an automatic parking brake mechanism, comprising a vehicle frame (9) and two wheels (7) mounted on the vehicle frame (9), a traction handle (1) being provided at the front end of the vehicle frame (9), characterized in that the two-wheeled transport vehicle further comprises a brake member (5) arranged at the front side of the wheel (7) for braking the wheel (7), the upper end of the brake member (5) being hinged to the vehicle frame (9) through a first hinge shaft (93), the rear side of the brake member (5) having a brake surface for pressing and contacting with the wheel (7); the two-wheeled transport vehicle further comprises a brake lever (2) located at the front side of the brake member (5), the brake lever (2) comprising a rod body (21) gradually tilted downward from rear to front, the upper end of the rod body (21) being hinged to the vehicle frame (9) through a second hinge shaft (94), the lower end of the rod body (21) being used to support the ground when the traction handle (1) is lowered; the brake lever (2) further comprises a limit rod arranged at the upper end of the rod body (21), a baffle (91) located at the front side of the limit rod is fixed on the vehicle frame (9), and the baffle (91) is used to cooperate with the rotated limit rod when the traction handle (1) is lifted, so as to prevent the lower end of the rod body (21) from contacting the ground; the brake rod (2) further comprises a push rod (4) arranged at the upper end of the rod body (21), and the push rod (4) is used to press on the brake member (5) after rotating with the rod body (21), so that the brake member (5) rotates around the axis of the first hinge shaft (93) and is in close contact with the wheel (7); the two-wheeled transport vehicle further comprises a first elastic member installed between the brake member (5) and the vehicle frame (9), and the first elastic member is used to be deformed by force when the brake member (5) is in close contact with the wheel (7), so as to provide a reset power for the reset of the brake member (5) when the push rod (4) is separated from the brake member (5).

2. The two-wheeled transport vehicle with an automatic parking brake mechanism according to claim 1 is characterized in that a sleeve (22) is provided at the upper end of the rod body (21), and the top rod (4) is threadedly connected to the sleeve (22).

3. The two-wheeled transfer vehicle with an automatic parking brake mechanism according to claim 2 is characterized in that: the front and rear ends of the push rod (4) are exposed outside the sleeve (22), the rear end of the push rod (4) is used to press the brake member (5), and the external thread of the push rod (4) is connected to a clamping nut (10) for clamping the front end surface of the sleeve (22); a threaded hole is provided at the front end of the push rod (4), and the limit rod is a limit bolt (3) threadedly connected to the front end of the push rod (4).

4. The two-wheeled transport vehicle with an automatic parking brake mechanism according to claim 3 is characterized in that the outer thread of the limiting bolt (3) is connected to a locking nut (11) for pressing the front end surface of the push rod (4).

5. The two-wheeled transport vehicle with an automatic parking brake mechanism according to any one of claims 1 to 4 is characterized in that the brake rod (2) also includes a support platform (23) arranged at the lower end of the rod body (21), the support platform (23) has an upward support surface (231), and the frame (9) is connected to a support rod (8) for supporting on the support surface.

6. The two-wheeled transport vehicle with an automatic parking brake mechanism according to claim 5 is characterized in that a cone head is provided at the lower end of the support rod (8), and a positioning hole (232) is provided on the supporting surface (231) to cooperate with the cone head.

7. The two-wheeled transport vehicle with an automatic parking brake mechanism according to claim 5 is characterized in that: a fixed cylinder (92) is fixed on the frame (9), the support rod (8) includes a rod portion (81) and a head portion (82) located at the lower end of the rod portion (81), the outer diameter of the head portion (82) is larger than the outer diameter of the rod portion (81), the rod portion (81) passes through the fixed cylinder (92), and the rod portion (81) is sleeved with a second elastic member, the upper end of the second elastic member presses on the fixed cylinder (92), and the lower end presses on the head portion (82).

8. The two-wheeled transport vehicle with an automatic parking brake mechanism according to claim 7 is characterized in that the rod (81) is provided with an external thread, and the portion of the rod (81) passing through the fixing tube (92) is threadedly connected with a fixing nut (13).

9. The two-wheeled transport vehicle with an automatic parking brake mechanism according to any one of claims 1 to 4, characterized in that the first elastic member is a tension spring (6).

10. The two-wheeled transfer vehicle with an automatic parking brake mechanism according to any one of claims 1 to 4 is characterized in that the brake component (5) includes a brake plate (51) and a brake pad (52) fixed on the brake plate (51), the upper end of the brake plate (51) is hinged to the frame (9) through the first hinge shaft (93), the first elastic component is connected to the brake plate (51), and the surface of the brake pad (52) constitutes the braking surface.