Steering locking mechanism of full trailer

Abstract

The invention relates to the technical field of universal full trailer chassis steering mechanism locking, and discloses a full trailer steering locking mechanism which comprises a driving part and a lock body part, the driving part comprises a machine shell, at least two stroke cavities are formed in the machine shell, and a driving source is arranged in each stroke cavity; the lock body component comprises a mounting shell and a locking pin set movably arranged in the mounting shell in the first direction, the locking pin set comprises at least two locking pins connected with each other, one end of each locking pin penetrates through the mounting shell and movably stretches into one stroke cavity to be connected with the driving end of the driving source, and the driving source can drive the locking pins to move in the first direction. And the other end of each locking pin extends out of the mounting shell to be in limited connection with the other one of the frame and the steering mechanism turntable frame, or is far away from the other one of the frame and the steering mechanism turntable frame and retracts into the mounting shell. And automatic locking and unlocking are achieved, the structure is compact, and stability is good.

Description

Technical Field

[0001] The invention relates to the technical field of locking of a universal full trailer chassis steering mechanism, in particular to a steering locking mechanism of a full trailer. Background Art

[0002] A trailer is a vehicle towed by a car but without its own power drive device, usually driven by a truck, tractor or forklift. A truck or tractor is usually called the main vehicle, and the driven vehicle towed by the main vehicle is called a trailer. Trailers are divided into semi-trailers and full trailers according to the connection method between the trailer and the towing vehicle. A semi-trailer is towed by a tractor, and part of its mass is borne by the tractor; a full trailer is towed by a tractor and all of its mass is borne by the trailer itself. The steering mechanism of a full trailer usually adopts a turntable shaft steering structure, which consists of a turntable turntable frame, a reverse locking pin, fixing bolts and nuts and other components. Before the tractor tows the full trailer in reverse, the reverse locking pin of the trailer must be manually inserted, and the reverse locking pin is used to lock the steering mechanism turntable frame and the frame so that the trailer can reverse straight as a whole. Otherwise, reversing is difficult and it is easy to cause the trailer and the tractor to form an excessively large angle, which will damage the vehicle parts after exceeding the limited angle range. When manually inserting the reverse locking pin of the trailer, the tractor driver and the locking pin operator need to cooperate. The driver adjusts the angle between the tractor and the trailer by reversing or moving forward. When the longitudinal centers of the tractor and the trailer are close to each other, the operator inserts one of the reversing locking pins into the pin hole. When inserting the other locking pin, the driver needs to drive slowly to adjust the angle to ensure that the two locking pins fall into the limit plate holes. When the trailer is driving normally, the reversing locking pin needs to be taken out and properly placed to prevent loss. It can be seen that the operation of the trailer steering lock is cumbersome, inefficient, and unsafe. Summary of the invention

[0003] Based on the above, the purpose of the present invention is to provide a steering locking mechanism for a full trailer, which realizes automatic locking and unlocking, has high safety and efficiency, and has a compact structure and good operation stability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A steering locking mechanism for a trailer is used for locking and unlocking a vehicle frame and a steering mechanism turntable frame, wherein the steering locking mechanism for the trailer is fixed to one of the vehicle frame and the steering mechanism turntable frame, and is characterized in that the steering locking mechanism for the trailer comprises:

[0006] The driving component comprises a housing, wherein at least two travel chambers are arranged in the housing, and a driving source is arranged in each of the travel chambers;

[0007] The lock body component includes a mounting shell and a locking pin group movably arranged in the mounting shell along a first direction, the locking pin group includes at least two locking pins connected to each other, one end of each locking pin passes through the mounting shell and movably extends into one of the travel chambers to be connected to the driving end of the driving source, and the driving source can drive the locking pin to move along the first direction so that the other end of each locking pin extends out of the mounting shell to a limit position connected to the other one of the frame and the steering mechanism turntable frame, or moves away from the frame and the other one of the steering mechanism turntable frame and retracts into the mounting shell.

[0008] As a preferred solution of the steering locking mechanism of a full trailer, the locking pin is connected to the other of the frame and the steering mechanism turntable frame through a limiting plate, the lock body component is located between the driving component and the limiting plate, and at least two locking holes are opened on the limiting plate, and each of the locking pins can be inserted into one of the locking holes.

[0009] As a preferred solution of the steering locking mechanism of a full trailer, a guide groove is provided on a side of the limit plate facing the lock body component, and one end of the locking hole passes through the bottom of the guide groove. Under the driving action of the driving source, one end of each locking pin can extend out of the mounting shell and into the guide groove. With the relative rotation of the frame and the steering mechanism turntable frame, each locking pin can be opposite to one of the locking holes and inserted into the locking hole.

[0010] As a preferred solution of the steering locking mechanism of a trailer, at least one first through hole is opened at one end of the mounting shell facing the driving component, each of the first through holes is directly opposite to one of the travel chambers, and one end of each of the locking pins movably passes through one of the first through holes and extends into one of the travel chambers;

[0011] At least two second through holes are formed at one end of the mounting shell facing the limit plate. As the vehicle frame and the steering mechanism turntable frame rotate, each of the second through holes can be directly opposite to one of the locking holes. Under the driving action of the driving source, one end of each of the locking pins can extend out of or retract from one of the second through holes.

[0012] As a preferred solution of the steering locking mechanism of a full trailer, the lock body component also includes at least two elastic members extending along the first direction in length direction, and an abutment ring is convexly provided on the outer periphery of each locking pin. Each elastic member is sleeved outside one of the locking pins and abuts between the abutment ring and the inner wall of one end of the mounting shell close to the limit plate.

[0013] As a preferred solution of the steering locking mechanism of a full trailer, an intermediate cross bar is fixedly connected between every two of the locking pins, and the lock body component also includes at least one guide rod fixed in the mounting shell, and a guide hole is opened on each of the intermediate cross bars, and the axial direction of the guide hole is arranged along the first direction, and each of the guide rods is movably inserted into one of the guide holes.

[0014] As a preferred solution of the steering locking mechanism of a full trailer, it also includes at least one safety pin, at least one of the guide rods is provided with a safety hole, and each of the safety pins can be detachably inserted into one of the safety holes.

[0015] As a preferred solution of the steering locking mechanism of a full trailer, the driving component also includes an electrically connected power supply module and a control box arranged in the casing, the power supply module is electrically connected to the power supply of the tractor, and a control module is arranged in the control box, and the control module is electrically connected to the driving source for controlling the working state and start and stop of the driving source.

[0016] As a preferred solution for the steering locking mechanism of a full trailer, a signal analysis module is further provided in the control box, and the signal analysis module is electrically connected to the control module. The signal analysis module is used to receive and analyze the reversing signal of the tractor, and the control module is used to control the working state and start and stop of the driving source according to the analysis signal of the signal analysis module.

[0017] As a preferred solution of the steering locking mechanism of a full trailer, the driving end of the driving source is connected to the locking pin via a flexible connector.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a steering locking mechanism for a full trailer, which is composed of a driving component and a lock body component. The driving source and other structures are integrated in the casing, and the locking pin group and other structures are integrated in the mounting shell. The steering locking mechanism for the full trailer has a high structural compactness and is convenient for overall installation and disassembly. The locking pin is driven by the driving source to extend or retract into the mounting shell to achieve locking and unlocking of the frame and the steering mechanism turntable frame. The degree of automation is high, which is conducive to saving operation time and has high safety. The travel cavity in the casing can provide a relatively stable guiding effect for the locking pin to ensure the moving stability of the locking pin. Since the locking pins are connected to each other, the locking pins act synchronously to accurately and quickly lock the frame and the steering mechanism turntable frame. At the same time, each locking pin is driven by a driving source, so that the power of the locking pin group is relatively large, and the frame and the steering mechanism turntable frame can be quickly and reliably locked. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of a tractor towing a trailer provided by an embodiment of the present invention (the tractor is not fully shown);

[0022] Figure 2 It is a schematic diagram of the internal structure of the steering locking mechanism of a full trailer provided by an embodiment of the present invention;

[0023] Figure 3 is a top view of a limiting plate provided in an embodiment of the present invention;

[0024] Figure 4 It is an electrical schematic diagram of a driving component provided by an embodiment of the present invention.

[0025] In the figure:

[0026] 1. Frame;

[0027] 2. Steering mechanism turntable frame;

[0028] 3. Driving component; 31. Casing; 310. Travel chamber; 32. Driving source; 33. Power module; 34. Control box; 35. Electrical connector; 36. Flexible connector;

[0029] 4. Lock body component; 41. Mounting shell; 410. Accommodating groove; 42. Locking pin; 43. Elastic member; 44. Abutment ring; 45. Cross bar; 46. Guide rod; 460. Safety hole;

[0030] 5. Limiting plate; 510. Locking hole; 520. Guide groove. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] like Figures 1 to 4 As shown, the present embodiment provides a steering locking mechanism for a full trailer, which is used for locking and unlocking a vehicle frame 1 and a steering mechanism turntable frame 2. The steering locking mechanism for the full trailer is fixed to one of the vehicle frame 1 and the steering mechanism turntable frame 2. By locking the vehicle frame 1 and the steering mechanism turntable frame 2, the steering mechanism turntable frame 2 cannot rotate relative to the vehicle frame 1, which is convenient for the tractor to tow the full trailer in reverse, etc. By unlocking the frame 1 and the steering mechanism turntable frame 2, the steering mechanism turntable frame 2 can rotate relative to the vehicle frame 1, which is convenient for the tractor to tow the full trailer on a curved road or a road that needs to turn.

[0036] Specifically, the steering locking mechanism of the trailer includes a driving component 3 and a lock body component 4. The driving component 3 includes a housing 31, and at least two travel chambers 310 are arranged in the housing 31. A driving source 32 is arranged in each travel chamber 310. The lock body component 4 includes a mounting shell 41 and a locking pin group movably arranged in the mounting shell 41 along a first direction. The locking pin group includes at least two mutually connected locking pins 42. One end of each locking pin 42 passes through the mounting shell 41 and movably extends into a travel chamber 310 to be connected to the driving end of the driving source 32. The driving source 32 can drive the locking pin 42 to move along the first direction, so that the other end of each locking pin 42 extends out of the mounting shell 41 to the other of the frame 1 and the steering mechanism turntable frame 2, or moves away from the frame 1 and the other of the steering mechanism turntable frame 2 and retracts into the mounting shell 41. The first direction is preferably a height direction, that is, a direction perpendicular to the ground. The steering locking mechanism of the trailer is composed of a driving component 3 and a lock body component 4. The driving source 32 and other structures are integrated in the housing 31, and the locking pin group and other structures are integrated in the mounting shell 41. The steering locking mechanism of the trailer has a high degree of structural compactness, which is convenient for overall installation and disassembly. Taking the steering locking mechanism of the trailer fixed on the frame 1 as an example, when it is necessary to lock the frame 1 and the steering mechanism turntable frame 2, the driving source 32 drives the corresponding locking pin 42 to move down until the locking pin 42 is limitedly connected with the steering mechanism turntable frame 2, which has a high degree of automation, is conducive to saving operation time, and has high safety; in this process, since the locking pins 42 are connected to each other, each locking pin 42 acts synchronously to accurately and quickly lock the frame 1 and the steering mechanism turntable frame 2; and each locking pin 42 is driven by a driving source 32, so that the power of the locking pin group is large, and the frame 1 and the steering mechanism turntable frame 2 can be quickly and reliably locked. When the vehicle frame 1 and the steering mechanism turntable frame 2 need to be unlocked, the locking pin group is driven upward by the driving source 32 to disengage from the steering mechanism turntable frame 2, thereby unlocking the vehicle frame 1 and the steering mechanism turntable frame 2. In the process of driving the locking pin 42 to move by the driving source 32, the travel cavity 310 provides a guiding and limiting function for the corresponding locking pin 42, so that the locking pin 42 is relatively stable and reliable during the upward and downward movement.

[0037] Preferably, the driving end of the driving source 32 is connected to the locking pin 42 via a flexible connector 36 , which has a certain shock-absorbing effect and is beneficial to extending the service life of the driving source 32 and the locking pin 42 .

[0038] More specifically, the locking pin 42 is connected to the other of the frame 1 and the steering mechanism turntable frame 2 through the limiting plate 5, the lock body component 4 is located between the driving component 3 and the limiting plate 5, and the limiting plate 5 is provided with at least two locking holes 510, and each locking pin 42 can be plugged into one locking hole 510. Taking the steering locking mechanism of the trailer fixed on the frame 1 and the limiting plate 5 arranged on the steering mechanism turntable frame 2 as an example, the relative position locking of the frame 1 and the steering mechanism turntable frame 2 is achieved through the plug-in cooperation of the locking pin 42 and the locking hole 510, the structure is simple, and the locking reliability is good. Of course, in other embodiments, the locking pin 42 and the steering mechanism turntable frame 2 can also be connected in a limited manner through other structures. For example, the locking hole 510 can also be directly opened on the steering mechanism turntable frame 2; or a plurality of grooves can be opened at the bottom end of the locking pin 42, and a plurality of bosses can be protruded on the limiting plate 5 or the steering mechanism turntable frame 2, and the bosses and the grooves can be connected one by one to achieve locking or unlocking of the locking pin 42 and the limiting plate 5 or the locking pin 42 and the steering mechanism turntable frame 2.

[0039] Preferably, a guide groove 520 is provided on one side of the limit plate 5 facing the lock body component 4, and one end of the locking hole 510 passes through the bottom of the guide groove 520. Under the driving action of the driving source 32, one end of each locking pin 42 can extend out of the mounting shell 41 and extend into the guide groove 520. With the relative rotation of the frame 1 and the steering mechanism turntable frame 2, each locking pin 42 can be opposite to a locking hole 510 and inserted into the locking hole 510. That is, the guide groove 520 is arc-shaped, and the arc center of the arc-shaped guide groove 520 is the rotation axis center of the steering mechanism turntable frame 2. After the driving source 32 drives the locking pin 42 to move down to extend out of the mounting shell 41, if the locking pin 42 is facing the locking hole 510, the locking pin 42 is inserted into the locking hole 510. If there is a position deviation between the locking pin 42 and the locking hole 510, through the relative rotation of the frame 1 and the steering mechanism turntable frame 2, the locking pin 42 slides in the guide groove 520 until the locking pin 42 is facing the corresponding locking hole 510, and the locking pin 42 is inserted into the locking hole 510 to achieve locking. The guide groove 520 provides a guiding and limiting function for the locking pin 42, so that the locking pin 42 has a position facing the locking hole 510 during the sliding process.

[0040] In this embodiment, at least one first through hole is provided at one end of the mounting shell 41 facing the driving component 3, each first through hole is opposite to a stroke cavity 310, and one end of each locking pin 42 is movable through a first through hole and extends into a stroke cavity 310; at least two second through holes are provided at one end of the mounting shell 41 facing the limiting plate 5, and each second through hole can be opposite to a locking hole 510 as the frame 1 rotates relative to the steering mechanism turntable frame 2, and under the driving action of the driving source 32, one end of each locking pin 42 can extend or retract from a second through hole. Both the first through hole and the second through hole provide a guiding and limiting function for the locking pin 42, so that the direction of the locking pin 42 remains stable and reliable during the movement, and the locking pin 42 is prevented from shaking during the movement, resulting in a failure to align with the locking hole 510.

[0041] Preferably, the lower end of the locking pin 42 is rounded to facilitate locating the second through hole and the locking hole 510 .

[0042] Furthermore, the lock body component 4 further includes at least two elastic members 43 extending in the first direction in the length direction, and an abutment ring 44 is convexly provided on the outer periphery of each locking pin 42. Each elastic member 43 is sleeved outside a locking pin 42 and abuts between the abutment ring 44 and the inner wall of one end of the mounting shell 41 close to the limit plate 5. The elastic member 43 may be, but is not limited to, a compression spring. When the driving source 32 drives the locking pin 42 to move downward, the abutting ring 44 on the locking pin 42 moves in the direction close to the limit plate 5, compressing the elastic member 43. The elastic member 43 plays a buffering role to prevent the driving force of the driving source 32 from being too large, causing the locking pin 42 to rush down too fast and collide, affecting its life; at the same time, when unlocking, the elastic member 43 provides a certain thrust for the upward movement of the locking pin 42, so that the locking pin 42 can quickly disengage from the locking hole 510, thereby achieving efficient and fast unlocking; and during the travel of the trailer, the setting of the elastic member 43 enables the locking pin 42 to be kept in the mounting shell 41 as much as possible, avoiding the possibility of the locking pin 42 being accidentally inserted into the locking hole 510 during the bumpy process; and when the driving source 32 fails, the elastic member 43 can ensure that the locking pin 42 is in a state of being out of the locking hole 510, that is, the frame 1 and the steering mechanism turntable frame 2 are in an unlocked state, so that the tractor can normally tow the trailer.

[0043] In this embodiment, the mounting shell 41 is formed with at least two receiving grooves 410 with a U-shaped cross section, each locking pin 42 is movably received in one receiving groove 410, one end of the elastic member 43 abuts against the abutting ring 44, and the other end abuts against the bottom of the receiving groove 410. The receiving groove 410 provides a limiting guide function for the locking pin 42 and the elastic member 43, further ensuring the stability of the locking pin 42 and the elastic member 43 during their movement.

[0044] Preferably, an intermediate crossbar 45 is fixedly connected between every two locking pins 42, and the lock body component 4 further includes at least one guide rod 46 fixed in the mounting shell 41, and a guide hole is opened on each intermediate crossbar 45, and the axial direction of the guide hole is arranged along the first direction, and each guide rod 46 is movably penetrated in a guide hole. When the locking pin 42 moves along the first direction, the crossbar 45 moves along the guide hole, ensuring the overall moving direction stability of the locking pin group, thereby ensuring the alignment accuracy between the locking pin 42 and the locking hole 510.

[0045] More preferably, at least one safety pin is further included, and at least one guide rod 46 is provided with a safety hole 460, and each safety pin is detachably plugged into a safety hole 460. When the frame 1 and the steering mechanism turntable frame 2 are in an unlocked state, that is, the locking pin group is in an initial state, and the initial state here means that the driving end of the driving source 32 is in a fully retracted state, the safety pin is plugged in at this time, and the safety pin is located below the cross bar 45, which can prevent the locking pin 42 from falling, for example, the locking pin 42 falls due to excessive bumping, etc., thereby ensuring that the frame 1 and the steering mechanism turntable frame 2 are always kept in an unlocked state.

[0046] Furthermore, if Figure 4 As shown in the electrical schematic diagram, the driving component 3 also includes an electrically connected power module 33 and a control box 34 arranged in the housing 31. The power module 33 is electrically connected to the power supply of the tractor. The control box 34 is provided with a control module, which is electrically connected to the driving source 32 to control the working state and start and stop of the driving source 32. Among them, the full trailer is usually provided with a 12V or 24V nominal voltage by the power supply of the tractor to provide power for the braking system, the outer edge lights, etc. The power module 33 is connected to the power supply of the tractor through an electrical connector 35. Taking the standard 24V, 15-core electrical connector 35 as an example, the plug and cable of the electrical connector 35 can provide power to the power module 33 through the standard 24V (12V), 15-core electrical connector 35. A torsion arm switch is provided at the socket of the electrical connector 35. When the switch is turned on, the electricity is connected, and when the switch is turned off, the power supply is turned off. When the tractor tows the full trailer, the plug and cable of the electrical connector 35 provide power and control signals for the steering locking mechanism of the full trailer.

[0047] In this embodiment, a signal analysis module is also provided in the control box 34, and the signal analysis module is electrically connected to the control module. The signal analysis module is used to receive and analyze the reversing signal of the tractor, and the control module is used to control the working state and start and stop of the driving source 32 according to the analysis signal of the signal analysis module. Taking the 24V, 15-core electrical connector 35 as an example, according to the contact arrangement of the 24V, 15-core electrical connector 35, 9 cores are continuous power supply (24V) and 8 cores are reversing lights. In this embodiment, 9 cores are reused as continuous power supply, and 8 cores are reused for the locking and unlocking signals of the steering locking mechanism of the trailer. The power supply module 33 provides a suitable DC power supply to the control box 34 by stepping up or down. The signal conversion module is used to analyze the reversing signal of the 8-core reversing light. Its basic logic is to provide the control module with a positive travel signal when reversing and a reverse travel signal when driving normally; the driver module is used to receive the reversing signal of the signal conversion module and drive the driving source 32 to make a correct action.

[0048] Specifically, the driving source 32 is a linear drive, that is, an electric push rod, or the driving source 32 is a linear cylinder. The control module outputs a control signal to the motor of the linear drive, and the motor rotates forward or reversely to realize the forward or backward movement of the push rod, that is, upward or downward movement, thereby realizing the downward or upward driving of the locking pin 42. Since the linear drive is a relatively mature existing technology, it will not be described in detail here.

[0049] The steering locking mechanism of the full trailer provided in this embodiment realizes an electromechanical integration structure, solves the problem of a single trailer without power supply, avoids the risk of losing the single reversing locking pin 42, and has high reliability; solves the problem that the operator must manually insert the locking pin 42 while traveling between the tractor and the full trailer when adjusting the vehicle posture, and no human intervention is required during the adjustment period, thereby avoiding the danger to the operator caused by driving; the steering locking mechanism of the full trailer can be replaced in situ in the original reversing locking mechanism without too much modification, and is easy to install; the steering locking mechanism of the full trailer is simple to operate, automatically locks when reversing, and automatically unlocks when driving, and has a high degree of automation; the steering locking mechanism of the full trailer is provided with a torsion arm switch and a safety pin to prevent misoperation.

[0050] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A steering locking mechanism for a trailer, used for locking and unlocking a vehicle frame and a steering mechanism turntable frame, wherein the steering locking mechanism for the trailer is fixed to one of the vehicle frame and the steering mechanism turntable frame, and is characterized in that: The steering locking mechanism of the trailer comprises: The driving component comprises a housing, wherein at least two travel chambers are arranged in the housing, and a driving source is arranged in each of the travel chambers; The lock body component includes a mounting shell and a locking pin group movably arranged in the mounting shell along a first direction, the locking pin group includes at least two locking pins connected to each other, one end of each locking pin passes through the mounting shell and movably extends into one of the travel chambers to be connected to the driving end of the driving source, and the driving source can drive the locking pin to move along the first direction so that the other end of each locking pin extends out of the mounting shell to a limit position connected to the other one of the frame and the steering mechanism turntable frame, or moves away from the frame and the other one of the steering mechanism turntable frame and retracts into the mounting shell.

2. The trailer steering locking mechanism according to claim 1, characterized in that: The locking pin is connected to the other of the vehicle frame and the steering mechanism turntable frame through a limiting plate, the lock body component is located between the driving component and the limiting plate, and at least two locking holes are opened on the limiting plate, and each locking pin can be inserted into one of the locking holes.

3. The trailer steering locking mechanism according to claim 2, characterized in that: A guide groove is provided on one side of the limit plate facing the lock body component, and one end of the locking hole passes through the bottom of the guide groove. Under the driving action of the driving source, one end of each locking pin can extend out of the mounting shell and into the guide groove. With the relative rotation of the vehicle frame and the steering mechanism turntable frame, each locking pin can face one of the locking holes and be inserted into the locking hole.

4. The trailer steering locking mechanism according to claim 2, characterized in that: At least one first through hole is formed at one end of the mounting shell facing the driving component, each of the first through holes is directly opposite to one of the travel chambers, and one end of each of the locking pins movably passes through one of the first through holes and extends into one of the travel chambers; At least two second through holes are formed at one end of the mounting shell facing the limit plate. As the vehicle frame and the steering mechanism turntable frame rotate, each of the second through holes can be directly opposite to one of the locking holes. Under the driving action of the driving source, one end of each of the locking pins can extend out of or retract from one of the second through holes.

5. The trailer steering locking mechanism according to claim 2, characterized in that: The lock body component also includes at least two elastic members extending along the first direction in length direction, and a contact ring is convexly provided on the outer periphery of each locking pin. Each elastic member is sleeved outside a locking pin and abuts between the contact ring and the inner wall of one end of the mounting shell close to the limit plate.

6. The trailer steering locking mechanism according to claim 1, characterized in that: An intermediate cross bar is fixedly connected between every two locking pins, and the lock body component also includes at least one guide rod fixed in the mounting shell. A guide hole is opened on each intermediate cross bar, and the axial direction of the guide hole is arranged along the first direction. Each guide rod is movably inserted into one of the guide holes.

7. The trailer steering locking mechanism according to claim 6, characterized in that: It also includes at least one safety pin. At least one of the guide rods is provided with a safety hole. Each of the safety pins can be detachably inserted into one of the safety holes.

8. The trailer steering locking mechanism according to claim 1, characterized in that: The driving component also includes an electrically connected power supply module and a control box arranged in the casing, the power supply module is electrically connected to the power supply of the tractor, and a control module is arranged in the control box, the control module is electrically connected to the driving source, and is used to control the working state and start and stop of the driving source.

9. The trailer steering locking mechanism according to claim 8, characterized in that: The control box is also provided with a signal analysis module, which is electrically connected to the control module. The signal analysis module is used to receive and analyze the reversing signal of the tractor, and the control module is used to control the working state and start and stop of the driving source according to the analysis signal of the signal analysis module.

10. The trailer steering locking mechanism according to any one of claims 1 to 9, characterized in that: The driving end of the driving source is connected to the locking pin via a flexible connector.

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