Piggyback transport vehicle

Abstract

The invention discloses a piggyback transport vehicle which comprises a vehicle body used for bearing a semitrailer compartment; the saddle is arranged at the top of the vehicle body in a sliding mode and used for being connected with a semitrailer traction pin, the saddle comprises a seat plate, and a connecting groove allowing the semitrailer traction pin to be clamped in is formed in the side, close to the semitrailer, of the seat plate. A semitrailer carriage is hoisted into a semitrailer body through a crane to be placed, a walking mechanism drives a saddle which moves to one side in advance to move towards the side close to a semitrailer traction pin till the semitrailer traction pin moves into a joint groove and is blocked by a retaining assembly, and then under the matching action of a driving cutting mechanism, a driving assembly stops driving a sliding assembly; therefore, the position of the saddle is fixed, when the piggyback transport vehicle faces semitrailer carriages with different lengths, it is only needed to set a fixed operation duration for the driving assembly, connection of the saddle and traction pins of semitrailers with different lengths can be guaranteed, and the purpose of improving the loading efficiency is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of railway freight transport, in particular to a piggyback transport vehicle. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] When building or repairing a power plant, it is often necessary to transport large equipment, such as generators, transformers, heavy machinery, etc. The size and weight of these equipment often exceed the capacity of ordinary transportation tools. The use of piggyback transport vehicles can reduce the time that equipment travels on the road, reduce damage to roads, improve transportation efficiency, and also reduce energy consumption during transportation, making it more environmentally friendly.

[0004] At present, the piggyback transport vehicle needs to position the semi-trailer carriage after taking over the semi-trailer carriage to avoid the semi-trailer carriage and the piggyback transport vehicle from colliding with each other due to the longitudinal impulse of the piggyback transport vehicle during railway transportation, which affects driving safety. In the prior art, the wheels are generally fixed first, and then the semi-trailer traction pin is also locked by a movable saddle. However, since the lengths of the semi-trailer carriages are different, the movable saddle needs to be manually adjusted according to the length of the carriage. However, due to the position error of the semi-trailer carriage hoisting and the position error of the manual adjustment of the movable saddle, the semi-trailer traction pin needs to consume a lot of time for alignment operation each time it is docked with the movable saddle, affecting the loading rate of subsequent vehicles. Summary of the invention

[0005] The purpose of the present invention is to provide a piggyback transport vehicle to solve the above-mentioned shortcomings, so as to achieve the purpose of enabling the movable saddle to be quickly connected and locked with the semi-trailer traction pin, thereby improving the loading efficiency.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a piggyback transport vehicle, comprising:

[0007] The body is used to carry the semi-trailer compartment;

[0008] A saddle is slidably arranged on the top of the vehicle body and is used to engage with the traction pin of the semi-trailer. The saddle includes a seat plate. A side of the seat plate close to the semi-trailer is provided with an engagement groove for the traction pin of the semi-trailer to be inserted into. The seat plate is provided with a stopper assembly for blocking the engagement groove after the traction pin of the semi-trailer is inserted into the engagement groove.

[0009] A traveling mechanism, used for driving the saddle to move toward and away from the trailer traction pin, the traveling mechanism comprising a sliding assembly arranged on the top of the vehicle body and a driving assembly used for driving the sliding assembly to move toward and away from the trailer traction pin;

[0010] The drive cut-off mechanism is arranged on the saddle and is used for cutting off the drive of the drive assembly to the sliding assembly after the saddle is engaged with the semi-trailer traction pin.

[0011] Furthermore, the anti-recoil assembly includes at least one anti-recoil rod arranged on the seat plate, one end of the anti-recoil rod is inserted into the coupling groove, and the other end passes through the seat plate and extends to the side of the seat plate close to the width direction of the vehicle body. A ring is fixedly provided at one end of the anti-recoil rod away from the coupling groove, and a tension spring is provided between the ring and the seat plate. When the tension spring is in a natural state, the anti-recoil rod is located in the moving area of ​​the semi-trailer traction pin.

[0012] Furthermore, there are two anti-retraction rods, and the two anti-retraction rods are respectively arranged on both sides of the seat plate, and a first synchronization mechanism for making the two anti-retraction rods move out of and into the engagement groove synchronously is arranged in the seat plate.

[0013] Furthermore, the first synchronization mechanism includes two slides located in the base plate, and the two slides are respectively mounted on two anti-backlash rods through bearing sleeves. A sliding groove is provided in the base plate for the slide to follow the movement of the anti-backlash rod. A connecting rod is rotatably arranged on the slide, and the two connecting rods are rotatably connected to each other at one end away from the slide, and a movable groove for the movement of the connecting rod is provided in the base plate.

[0014] Furthermore, the seat plate is provided with L-shaped positioning rods on both sides close to the width direction of the vehicle body, and the L-shaped positioning rods are composed of a vertical section connected to the seat plate and a transverse section connected to the vertical section. A positioning block is provided on the ring, and a recessed groove for the positioning block to be inserted into the side of the transverse section away from the seat plate is provided, which is used for the corresponding positioning block to be rotated and inserted after the anti-retraction rod is moved out of the engagement groove.

[0015] Furthermore, the sliding assembly includes two guide rails arranged on the top of the vehicle body and two vertical plates located between the two guide rails, a screw is fixedly arranged between the two vertical plates, a slide located on the top of the screw is slidably arranged between the two guide rails, a plurality of supporting assemblies are arranged between the slide and the seat plate, for making the seat plate move synchronously with the slide, a side plate is arranged on the top of the slide, a central axis penetrating the side plate is fixedly arranged on the side plate, a driven disk is arranged at one end of the central axis close to the driving assembly, the driven disk is slidably arranged on the central axis and rotates relative to the central axis, and teeth are arranged on the outside of the driven disk, a compression spring is arranged between the driven disk and the side plate, and a screw sleeve meshing with the driven disk is threadedly connected on the screw;

[0016] The driving assembly includes a motor and a driving disk arranged at the output end of the motor, and the driven disk is provided with a protrusion on the side opposite to the driving disk. When the compression spring is in a natural state, the corresponding protrusion of the driven disk is located in the rotation area of ​​the corresponding protrusion of the driving disk.

[0017] Furthermore, the driving and cutting mechanism includes two pressure blocks arranged in the seat plate and capable of moving along the length direction of the vehicle body, and a lever is slidably arranged on the side of the pressure block away from the engagement groove, penetrating the seat plate and being inserted into the driven plate, and an annular groove for inserting the lever is opened on the driven plate, and a spring sheet is arranged between the lever and the corresponding pressure block, and when the spring sheet is in a natural state, the bottom end of the lever is located in the annular groove, and when the spring sheet is compressed to a minimum state, the lever is located outside the annular groove, and the driving and cutting mechanism also includes an inner gear sleeve which is sleeved on the stop rod and meshed with the stop rod, and the inner gear sleeve is rotatably arranged in the seat plate through a bearing, and a pull rope is arranged between the lever and the inner gear sleeve, and when the stop rod is rotated and the positioning block is stuck in the sink groove, the inner gear sleeve reels up the pull rope and pulls the lever to move it outside the annular groove.

[0018] Furthermore, a second synchronization mechanism is provided between the two shift rods for making the two shift rods move in opposite directions. The second synchronization mechanism includes a gear rotatably arranged in the seat plate and two racks arranged on the upper and lower sides of the gear. The two racks are respectively connected to the opposite sides of the two shift rods and are both engaged with the gears.

[0019] The beneficial effects of the present invention are embodied in:

[0020] The present invention uses a crane to lift the semi-trailer car body into the car body and place it therein, so that the walking mechanism drives the saddle that has been moved to one side in advance to move toward the side close to the semi-trailer traction pin, until the semi-trailer traction pin moves into the engagement groove and is blocked by the back-stop assembly, and then under the cooperation of the driving cut-off mechanism, the driving assembly stops driving the sliding assembly, thereby completing the fixation of the saddle position, so that when the piggyback transport vehicle faces semi-trailer cars of different lengths, it only needs to set a fixed operating time for the driving assembly to ensure the connection between the saddle and the traction pins of the semi-trailers of different lengths, thereby achieving the purpose of improving the loading efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional view of the present invention;

[0022] Figure 2 It is a schematic diagram of the connection between the saddle and the walking mechanism of the present invention;

[0023] Figure 3 for Figure 2 A local enlarged schematic diagram of point A is shown;

[0024] Figure 4 A partial cross-sectional view of the sliding assembly of the present invention;

[0025] Figure 5 is a partial cross-sectional view of the saddle of the present invention;

[0026] Figure 6 for Figure 5A local enlarged schematic diagram of point B is shown;

[0027] Figure 7 It is a schematic diagram of the connection between the second synchronization mechanism and the shifting rod of the present invention.

[0028] In the figure:

[0029] 1. Car body; 2. Saddle; 21. Seat plate; 22. Backstop assembly; 221. Backstop rod; 222. Ring; 223. Tension spring; 3. Travel mechanism; 31. Sliding assembly; 311. Guide rail; 312. Vertical plate; 313. Screw rod; 314. Slide; 315. Side plate; 316. Center shaft; 317. Driven plate; 318. Compression spring; 319. Screw sleeve; 32. Driving assembly; 321. Motor; 322. Active plate; 4. Driving cutting mechanism; 41. Pressure block; 42. Push rod; 43. Spring leaf; 44. Internal gear sleeve; 45. Pull rope; 5. First synchronization mechanism; 51. Slide plate; 52. Connecting rod; 6. L-shaped positioning rod; 7. Second synchronization mechanism. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-7 The present invention discloses a piggyback transport vehicle, comprising:

[0032] The vehicle body 1 is used to carry the semi-trailer compartment;

[0033] The saddle 2 is slidably arranged on the top of the vehicle body 1 and is used to engage with the traction pin of the semi-trailer. The saddle 2 includes a seat plate 21. The seat plate 21 is provided with an engagement groove for the traction pin of the semi-trailer to be inserted into on one side close to the semi-trailer. The seat plate 21 is provided with a stopper assembly 22 for blocking the engagement groove after the traction pin of the semi-trailer is inserted into the engagement groove.

[0034] A traveling mechanism 3, used for driving the saddle 2 to move towards and away from the trailer traction pin, the traveling mechanism 3 comprises a sliding assembly 31 arranged on the top of the vehicle body 1 and a driving assembly 32 used for driving the sliding assembly 31 to move towards and away from the trailer traction pin;

[0035] The drive cut-off mechanism 4 is arranged on the saddle 2 and is used for cutting off the drive of the driving assembly 32 to the sliding assembly 31 after the saddle 2 is engaged with the trailer traction pin.

[0036] The present invention uses a crane to lift the semi-trailer carriage into the vehicle body 1 and place it there, so that the walking mechanism 3 drives the saddle 2 that has been moved to one side in advance to move toward the side close to the semi-trailer traction pin, until the semi-trailer traction pin moves into the engagement groove and is blocked by the stop assembly 22, and then with the cooperation of the drive cut-off mechanism 4, the drive assembly 32 stops driving the sliding assembly 31, thereby completing the fixation of the position of the saddle 2, so that when the piggyback transport vehicle faces semi-trailer carriages of different lengths, it only needs to set a fixed operating time for the drive assembly 32 to ensure the connection between the saddle 2 and the traction pins of the semi-trailers of different lengths, thereby achieving the purpose of improving loading efficiency.

[0037] It should be noted that the drive assembly 32 can be remotely controlled and can also be manually closed after completing the receiving of the semi-trailer compartment.

[0038] In a specific implementation, before the saddle 2 is locked, the wheels of the semitrailer compartment must be positioned by the wheel stopper. In order to facilitate the placement and removal of the wheel stopper into and from the vehicle body 1, a plurality of hollow holes are provided on one side of the vehicle body 1 in the width direction.

[0039] In one embodiment, the width of the engagement groove is greater than the outer diameter of the semi-trailer traction pin, so that the saddle 2 can also engage with the offset semi-trailer traction pin during movement, reducing the difficulty of alignment in the previous lifting operation. The backstop assembly 22 includes at least one backstop rod 221 arranged on the seat plate 21, one end of the backstop rod 221 is inserted into the engagement groove, and the other end passes through the seat plate 21 and extends to the side of the seat plate 21 close to the width direction of the vehicle body 1. The backstop rod 221 is provided with an inclined surface on the side close to the semi-trailer, which is used to push the backstop rod 221 to move out of the engagement groove after the semi-trailer traction pin abuts the inclined surface, so that the semi-trailer traction pin can enter the engagement groove. A ring 222 is fixedly provided on the end of the backstop rod 221 away from the engagement groove, and a tension spring 223 is provided between the ring 222 and the seat plate 21. When the tension spring 223 is in a natural state, the backstop rod 221 is located in the moving area of ​​the semi-trailer traction pin.

[0040] This design allows the stop rod 221 to automatically move out of the engagement groove after being pushed by the trailer traction pin, so that the trailer traction pin first moves into the trailer traction pin, and then can be reset under the pull of the tension spring 223, and the trailer traction pin can be locked without manual operation.

[0041] It should be noted that, in order to facilitate manual pulling of the back-stopping rod 221 , a pull ring is provided at one end of the back-stopping rod 221 away from the engagement groove.

[0042] In one embodiment, there are two stop rods 221 , and the two stop rods 221 are respectively disposed on both sides of the seat plate 21 . A first synchronization mechanism 5 is disposed in the seat plate 21 for making the two stop rods 221 move out of and into the engagement groove synchronously.

[0043] This design allows operators to remove the blockage of the semi-trailer's traction pin by pulling the adjacent stop rod 221 when approaching the piggyback transport vehicle from different platform directions.

[0044] It should be noted that the maximum distance between the pull rings corresponding to the two backstop rods 221 does not exceed the railway limit.

[0045] In one embodiment, the first synchronization mechanism 5 includes two slides 51 located in the seat plate 21, and the two slides 51 are respectively arranged on the two backstop rods 221 through bearing sleeves. A sliding groove is provided in the seat plate 21 for the slide 51 to follow the backstop rod 221 to move, so that the slide 51 can move synchronously in a straight line following the backstop rod 221, and will not rotate along with the backstop rod 221. A connecting rod 52 is rotatably provided on the slide 51, and the two connecting rods 52 are rotatably connected to each other at one end away from the slide 51, and a movable groove for the connecting rod 52 to move is provided in the seat plate 21.

[0046] With this design, when any one of the backstop rods 221 is pulled, the corresponding slide plate 51 moves, causing the position of the connecting rod 52 connected thereto to change, thereby changing the position of the other connecting rod 52, so that the backstop rod 221 on the other side is pushed by the corresponding slide plate 51 and adjusts its position synchronously.

[0047] In one embodiment, both sides of the seat plate 21 close to the width direction of the vehicle body 1 are provided with L-shaped positioning rods 6 which are not located in the moving area of ​​the backstop rod 221. The L-shaped positioning rod 6 consists of a vertical section connected to the seat plate 21 and a transverse section connected to the vertical section. A positioning block is provided on the ring 222. A recessed groove for the positioning block to be inserted is provided on the side of the transverse section away from the seat plate 21, so as to allow the corresponding positioning block to be rotated and inserted after the backstop rod 221 is moved out of the engagement groove.

[0048] With this design, when the semi-trailer car body moves to the destination, the operator can first pull any one of the back-stop rods 221 to move the back-stop rod 221 out of the coupling groove, and then rotate the back-stop rod 221 to align the positioning block with the sink groove. At this time, release the back-stop rod 221 to ensure that the back-stop rod 221 will not be reinserted into the coupling groove due to the action of the tension spring 223, but the coupling groove will be kept in an open state under the cooperation of the positioning block and the L-shaped positioning rod 6, thereby facilitating the subsequent walking mechanism 3 to drive the saddle 2 away from the semi-trailer traction pin, avoiding the collision between the semi-trailer traction pin and the saddle 2 during the subsequent lifting process, affecting the normal lifting of the semi-trailer car body.

[0049] In one embodiment, the sliding assembly 31 includes two guide rails 311 arranged on the top of the vehicle body 1 and two vertical plates 312 located between the two guide rails 311. A screw rod 313 is fixedly arranged between the two vertical plates 312. A slide 314 located on the top of the screw rod 313 is slidably arranged between the two guide rails 311. A plurality of supporting assemblies are arranged between the slide 314 and the seat plate 21 to enable the seat plate 21 to move synchronously with the slide 314. The supporting assemblies can adopt hydraulic telescopic components, pneumatic telescopic components and electric telescopic components in the prior art, so that the height of the seat plate 21 can be adjusted according to needs to meet different semi-trailer models. A side plate 315 is arranged on the top of the slide 314. A central shaft 316 penetrating the side plate 315 is fixedly provided, and a driven disk 317 is provided at one end of the central shaft 316 close to the driving assembly 32. The driven disk 317 is slidably provided on the central shaft 316 and rotates relative to the central shaft 316, and teeth are provided on the outside of the driven disk 317. A compression spring 318 for pushing the driven disk 317 to move toward one side of the driving assembly 32 is provided between the driven disk 317 and the side plate 315. A screw sleeve 319 located at the bottom of the driven disk 317 and meshing with the driven disk 317 is threadedly connected to the screw rod 313. The screw sleeve 319 is inserted into the slide 314 and can rotate in the slide 314, so as to synchronously drive the slide 314 to move when the screw sleeve 319 moves on the screw rod 313;

[0050] The driving assembly 32 includes a motor 321 and an active disk 322 arranged at the output end of the motor 321. The driven disk 317 is provided with a protrusion on the opposite side of the active disk 322. When the compression spring 318 is in a natural state, the corresponding protrusion of the driven disk 317 is located in the rotation area of ​​the corresponding protrusion of the active disk 322.

[0051] With this design, when the compression spring 318 is in a natural state, the rotation of the motor 321 drives the active disk 322 to rotate. Since the corresponding protrusion of the driven disk 317 is located in the rotation area of ​​the corresponding protrusion of the active disk 322, the driven disk 317 rotates along with the active disk 322, and the driven disk 317 is meshed with the screw sleeve 319. The rotation of the screw sleeve 319 on the screw rod 313 drives the slide 314 to move along the guide rail 311, so that the driving and cutting mechanism 4 only needs to cut off the connection between the driven disk 317 and the active disk 322 to change the moving state of the sliding assembly 31, and the continued operation of the motor 321 after cutting off will not be adversely affected.

[0052] In one embodiment, the driving and cutting mechanism 4 includes two pressure blocks 41 arranged in the seat plate 21 and capable of moving along the length direction of the vehicle body 1. A lever 42 that penetrates the seat plate 21 and is plugged into the driven disk 317 is slidably arranged on the side of the pressure block 41 away from the engagement groove. The driven disk 317 is provided with an annular groove for the lever 42 to be inserted. A spring 43 is arranged between the lever 42 and the corresponding pressure block 41. When the spring 43 is in a natural state, the bottom end of the lever 42 is located in the annular groove. When the spring 43 is compressed to the minimum state, the lever 42 is located outside the annular groove. The driving and cutting mechanism 4 also includes a lever 42 that is sleeved on the stop rod 221 and The inner gear sleeve 44 meshing with the backstop rod 221 is rotatably arranged in the seat plate 21 through a bearing. A section of the outer peripheral wall of the backstop rod 221 located in the inner gear sleeve 44 is provided with teeth meshing with the inner gear sleeve 44, so that the backstop rod 221 will not drive the inner gear sleeve 44 to move when it moves toward and away from the engaging groove, but will drive the inner gear sleeve 44 to rotate when the backstop rod 221 rotates. A pull rope 45 is provided between the lever 42 and the inner gear sleeve 44. When the backstop rod 221 is rotated and the positioning block is stuck in the sink groove, the inner gear sleeve 44 reels the pull rope 45 and pulls the lever 42 to move it outside the annular groove.

[0053] In this design, the lever 42 is inserted into the annular groove, so that when the corresponding protrusion of the driven plate 317 is located in the rotation area of ​​the corresponding protrusion of the active plate 322, one end of the pressure block 41 is located in the engagement groove, so that after the semi-trailer traction pin moves into the engagement groove, it will continuously push the pressure block 41 until the pressure block 41 is completely moved into the seat plate 21, and the movement of the pressure block 41 will drive the lever 42 to push the driven plate 317 away from the active plate 322, so that the semi-trailer traction pin is completely moved into the engagement groove. After being inserted into the groove, the driven disk 317 can automatically separate from the active disk 322, release the transmission, and stop the seat plate 21 from moving. At the same time, due to the setting of the inner gear sleeve 44 and the pull rope 45, the positioning block and the L-shaped positioning rod 6 cooperate to keep the engagement groove in an open state, and the lever 42 can move out of the annular groove, so that the driven disk 317 is pushed by the compression spring 318 to move back into the rotation area of ​​the corresponding protrusion of the active disk 322, so that the driving assembly 32 can normally drive the sliding assembly 31 to move.

[0054] In one embodiment, a second synchronization mechanism 7 is provided between the two levers 42 for moving the two levers 42 in opposite directions. The second synchronization mechanism 7 includes a gear rotatably provided in the seat plate 21 and two racks provided on the upper and lower sides of the gear. The two racks are respectively connected to the opposite sides of the two levers 42 and are both engaged with the gears.

[0055] With this design, any lever 42 can drive the corresponding rack to move after being driven by the rotating pull rope 45 of the inner gear sleeve 44, so that the other rack moves in the opposite direction under the rotation of the gear, thereby synchronously driving the other lever 42 to move out of the annular groove.

[0056] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] In addition, "plurality" means two or more.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A piggyback transport vehicle, characterized in that: include: A vehicle body (1) for carrying a semi-trailer compartment; A saddle (2) is slidably arranged on the top of the vehicle body (1) and is used to engage with the traction pin of the semitrailer. The saddle (2) comprises a seat plate (21). A side of the seat plate (21) close to the semitrailer is provided with an engagement groove for the traction pin of the semitrailer to be inserted into. A stopper assembly (22) is provided on the seat plate (21) for blocking the engagement groove after the traction pin of the semitrailer is inserted into the engagement groove. A traveling mechanism (3) is used for driving the saddle (2) to move in a direction close to or away from the traction pin of the semi-trailer, the traveling mechanism (3) comprising a sliding assembly (31) arranged on the top of the vehicle body (1) and a driving assembly (32) used for driving the sliding assembly (31) to move in a direction close to or away from the traction pin of the semi-trailer; The drive cut-off mechanism (4) is arranged on the saddle (2) and is used to cut off the drive of the driving component (32) on the sliding component (31) after the saddle (2) is engaged with the trailer traction pin.

2. The piggyback transport vehicle according to claim 1, characterized in that: The anti-recoil assembly (22) comprises at least one anti-recoil rod (221) arranged on the seat plate (21), one end of the anti-recoil rod (221) is inserted into the engagement groove, and the other end passes through the seat plate (21) and extends to the side of the seat plate (21) close to the width direction of the vehicle body (1), a collar (222) is fixedly arranged at one end of the anti-recoil rod (221) away from the engagement groove, a tension spring (223) is arranged between the collar (222) and the seat plate (21), and when the tension spring (223) is in a natural state, the anti-recoil rod (221) is located in the moving area of ​​the semi-trailer traction pin.

3. The piggyback transport vehicle according to claim 2, characterized in that: There are two stop rods (221), and the two stop rods (221) are respectively arranged on both sides of the seat plate (21). A first synchronization mechanism (5) is arranged in the seat plate (21) for making the two stop rods (221) move out of and into the engagement groove synchronously.

4. The piggyback transport vehicle according to claim 3, characterized in that: The first synchronization mechanism (5) comprises two slide plates (51) located in the seat plate (21), the two slide plates (51) are respectively mounted on two backstop rods (221) through bearing sleeves, a slide groove is provided in the seat plate (21) for the slide plate (51) to follow the backstop rod (221) to move, a connecting rod (52) is rotatably provided on the slide plate (51), the two connecting rods (52) are rotatably connected to each other at one end away from the slide plate (51), and a movable groove is provided in the seat plate (21) for the connecting rod (52) to move.

5. The piggyback transport vehicle according to claim 3, characterized in that: L-shaped positioning rods (6) are arranged on both sides of the seat plate (21) close to the width direction of the vehicle body (1), and the L-shaped positioning rod (6) is composed of a vertical section connected to the seat plate (21) and a transverse section connected to the vertical section. A positioning block is arranged on the collar (222), and a recessed groove for the positioning block to be inserted is provided on the side of the transverse section away from the seat plate (21), so as to allow the corresponding positioning block to be rotated and inserted after the stop rod (221) moves out of the engagement groove.

6. The piggyback transport vehicle according to claim 5, characterized in that: The sliding assembly (31) comprises two guide rails (311) arranged on the top of the vehicle body (1) and two vertical plates (312) located between the two guide rails (311); a screw rod (313) is fixedly arranged between the two vertical plates (312); a slide table (314) located on the top of the screw rod (313) is slidably arranged between the two guide rails (311); a plurality of supporting assemblies are arranged between the slide table (314) and the seat plate (21) for making the seat plate (21) move synchronously with the slide table (314); a side plate (314) is arranged on the top of the slide table (314); 15), a central shaft (316) penetrating the side plate (315) is fixedly provided on the side plate (315), a driven disc (317) is provided at one end of the central shaft (316) close to the driving assembly (32), the driven disc (317) is slidably provided on the central shaft (316) and rotates relative to the central shaft (316), and teeth are provided on the outside of the driven disc (317), a compression spring (318) is provided between the driven disc (317) and the side plate (315), and a screw sleeve (319) meshing with the driven disc (317) is threadedly connected on the screw rod (313); The driving assembly (32) comprises a motor (321) and a driving disk (322) arranged at the output end of the motor (321); a protrusion is arranged on one side of the driven disk (317) opposite to the driving disk (322); and when the compression spring (318) is in a natural state, the corresponding protrusion of the driven disk (317) is located within the rotation area of ​​the corresponding protrusion of the driving disk (322).

7. The piggyback transport vehicle according to claim 6, characterized in that: The driving cut-off mechanism (4) comprises two pressure blocks (41) arranged in the seat plate (21) and movable along the length direction of the vehicle body (1); a lever (42) penetrating the seat plate (21) and plugged into the driven plate (317) is slidably arranged on the side of the pressure block (41) away from the engagement groove; an annular groove for inserting the lever (42) is provided on the driven plate (317); a spring leaf (43) is arranged between the lever (42) and the corresponding pressure block (41); when the spring leaf (43) is in a natural state, the bottom end of the lever (42) is located in the annular groove; When the spring leaf (43) is compressed to a minimum state, the lever (42) is located outside the annular groove. The driving cutting mechanism (4) further comprises an inner gear sleeve (44) sleeved on the stop rod (221) and meshing with the stop rod (221). The inner gear sleeve (44) is rotatably arranged in the seat plate (21) via a bearing. A pull rope (45) is arranged between the lever (42) and the inner gear sleeve (44). When the stop rod (221) is rotated and the positioning block is stuck in the sink groove, the inner gear sleeve (44) reels in the pull rope (45) and pulls the lever (42) to move it outside the annular groove.

8. The piggyback transport vehicle according to claim 7, characterized in that: A second synchronization mechanism (7) for causing the two shifting rods (42) to move in opposite directions is arranged between the two shifting rods (42). The second synchronization mechanism (7) comprises a gear rotatably arranged in the seat plate (21) and two racks arranged on the upper and lower sides of the gear. The two racks are respectively connected to the opposite sides of the two shifting rods (42) and are both meshed with the gear.

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