A tractor primary suspension gap adjustment system

Abstract

The application discloses a tractor main trailer gap adjusting system, which comprises a flow guide device and a controller. The flow guide device comprises a folding plate assembly, a guide assembly, a recycling assembly, a folding rod and an electromagnet assembly. The recycling assembly comprises a one-way locking mechanism. The controller comprises an initial judgment module, an unfolding judgment module, a secondary judgment module, a control starting module and a control recycling module. The gap between the cab and the cargo box is closed by the telescopic flow guide device, the airflow vortex formed by the gap during driving is reduced, the air resistance of the train during high-speed driving is effectively reduced, and the energy cost is reduced. The structure is reasonably designed, the fixing mode is reliable, the air resistance can be effectively reduced, the wind resistance effect is improved, the flow guide device is controlled according to the vehicle speed, the main trailer gap is controlled, the flow guide device is adjusted according to the driving condition, the application is more adaptable, and is more suitable for long-time use.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a tractor-trailer gap adjustment system. Background Technology

[0002] When a vehicle speed exceeds 80 km / h, wind resistance becomes the main driving resistance. Among them, the wind resistance generated by the gap between the main and trailer accounts for about 16% of the overall drag coefficient of the traction train. The impact gradually increases, especially when the speed exceeds 50 km / h, making it the second largest source of wind resistance after the frontal area of ​​the train.

[0003] To address the wind resistance caused by the gap between the trailer and trailer, the traditional approach is to use a fixed airflow deflector to seal the gap. However, in the fields of new energy and gas-powered tractor vehicles, the wheelbase is generally long, and the front overhang of the trailer comes in various sizes, resulting in a large span between the tractor cab and the cargo box. This makes fixed airflow deflectors unsuitable for various vehicle-trailer combinations. Therefore, to solve the problem of poor adaptability of fixed airflow deflectors, those skilled in the art have proposed adjustable gap deflector structures. These structures are designed with several sliding plates supported by guide rails, which close the gap between the trailer and trailer by pushing the sliding plates. However, existing adjustable gap deflector structures lack reliable positioning and fixing methods. Most do not provide an effective way to lock the trailer position or fix the telescopic plate, resulting in frequent collisions between the telescopic plate and the trailer under vehicle vibration. Even with cushioning components, this will shorten the lifespan of the components in the long run. Moreover, when the vehicle turns, there is an angle between the trailer and the tractor. The trailer squeezes the telescopic plate to adjust the gap. This hard squeezing can not only damage the components in the Y-axis due to friction or the trailer's protrusion, but the frequent squeezing itself is also a form of impact. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a tractor-trailer gap adjustment system.

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or to describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0006] The present invention adopts the following technical solution:

[0007] This invention provides a tractor-trailer gap adjustment system, comprising: a flow guiding device and a controller;

[0008] The flow guiding device includes: a folding plate assembly, a guiding assembly, a recycling assembly, and an electromagnet assembly, wherein the recycling assembly includes: a one-way locking mechanism;

[0009] The controller includes:

[0010] The initial judgment module is used to determine whether the current vehicle speed V satisfies V≥30km / h;

[0011] The unfolding judgment module is used to determine whether the flow guiding device has been unfolded when the judgment result of the initial judgment module is negative.

[0012] The secondary judgment module is used to determine whether the current vehicle speed V satisfies V≥50km / h when the judgment result of the initial judgment module is yes;

[0013] The control start module is used to send a control command to the guide component when the determination result of the secondary judgment module is yes, so as to control the guide component to drive the folding plate component to perform an unfolding action;

[0014] The control and recycling module is used to send control commands to the one-way locking mechanism and the electromagnet assembly when the determination result of the unfolding judgment module is yes, so as to control the one-way locking mechanism and the electromagnet assembly to turn off the limit on the recycling component, so that the recycling component drives the folding plate assembly to perform the recycling action.

[0015] Furthermore, the flow guiding device also includes a detection mechanism for detecting whether the folding panel assembly is connected to the cargo box in place;

[0016] The controller also includes:

[0017] The connection determination module is used to determine whether a connection signal has been received from the detection mechanism.

[0018] The control stop module is used to send a control command to the guide component when the judgment result of the connection judgment module is yes, so as to control the guide component to stop its operation;

[0019] The notification counting module is used to send a notification message to the control recycling module and the control start module when the judgment result of the connection judgment module is negative, so as to notify the control recycling module to execute the recycling process, and after the recycling process is completed, notify the control start module to execute the expansion process, and determine whether the number of times the expansion process is executed N satisfies N>3.

[0020] The recycling reporting module is used to notify the control recycling module to execute the recycling process and upload fault data when the judgment result of the notification counting module is yes.

[0021] Furthermore, the folding panel assembly includes: a left folding panel disposed on the left side of the gap between the cab and the cargo box, with its front end connected to the cab; a right folding panel disposed on the right side of the gap between the cab and the cargo box, with its front end connected to the cab; and a top folding panel disposed above the gap between the cab and the cargo box, with its front end connected to the cab; the left folding panel, the right folding panel, and the top folding panel are all composed of at least two panel units connected sequentially.

[0022] Furthermore, the guiding assembly includes: a guiding power source, a left telescopic rod, and a right telescopic rod; the left telescopic rod is located at the upper left of the rear of the cab, and the right telescopic rod is located at the upper right of the rear of the cab; the actuating end of the left telescopic rod is connected to the end of the left folding plate and the left end of the top folding plate, and the right telescopic rod is connected to the end of the right folding plate and the right end of the top folding plate.

[0023] Furthermore, the recycling assembly also includes an automatic recycling mechanism; the automatic recycling mechanism includes a housing, a coil spring, a shaft, and a recycling line, the shaft being connected to the housing via the coil spring, one end of the recycling line being connected to the shaft, and the other end being connected to the actuating end of the left telescopic rod and the actuating end of the right telescopic rod.

[0024] Furthermore, the one-way locking mechanism includes a locking power source and a ratchet mechanism, wherein the locking power source is connected to the pawl in the ratchet mechanism, and the ratchet in the ratchet mechanism is disposed on the shaft.

[0025] Furthermore, the electromagnet assembly includes a plurality of electromagnets, which are evenly spaced at the end edges of the left folding plate, the right folding plate, and the top folding plate.

[0026] Furthermore, the flow guiding device also includes a folding rod, which is provided on the left folding plate, the right folding plate, and the top folding plate.

[0027] Furthermore, the guiding power source and the locking power source are electric power sources or pneumatic power sources.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. By using a retractable airflow deflector, the gap between the cab and the cargo box is sealed, reducing the airflow vortex formed during operation, effectively reducing air resistance at high speeds and lowering energy costs.

[0030] 2. The structure is reasonably designed and the fixing method is reliable, which can also effectively reduce air resistance and improve wind resistance.

[0031] 3. The flow guiding device is controlled according to the vehicle speed, thereby controlling the main trailer clearance. The flow guiding device is adjusted according to the driving conditions, making the invention more adaptable and more suitable for long-term use. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a front view of the flow guiding device of the present invention when it has completed recycling;

[0034] Figure 2 This is a top view of the flow guiding device of the present invention when it has completed recycling;

[0035] Figure 3 This is a schematic diagram of the folding rod and folding plate assembly of the present invention used together;

[0036] Figure 4 This is a front view of the flow guiding device of the present invention when it is deployed;

[0037] Figure 5 This is a top view of the flow guiding device of the present invention when it is deployed;

[0038] Figure 6 This is a schematic diagram of one possible structure of the folding plate assembly of the present invention;

[0039] Figure 7 This is the control flowchart of the present invention. Detailed Implementation

[0040] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1-7 As shown in some illustrative embodiments, a tractor-trailer gap adjustment system is provided, including: a flow guide device and a controller. The controller actively controls the flow guide device to deploy and retract via a vehicle speed signal, and after deployment, it is stably connected to the cargo box to achieve the purpose of closing the gap between the main and trailer.

[0042] The flow guiding device includes: a folding plate assembly 100, a guiding assembly 200, a recycling assembly 300, an electromagnet assembly 400, a folding rod 500, and a detection mechanism.

[0043] Folding panel assembly 100 is a foldable panel used to close the gap between the main hanging parts. Specifically, folding panel assembly 100 includes: a left folding panel 110, a right folding panel 120, and a top folding panel 130.

[0044] The left folding plate 110 is located on the left side of the gap between the cab 1 and the cargo box 2, and the front end of the left folding plate 110 is connected to the cab 1; the right folding plate 120 is located on the right side of the gap between the cab 1 and the cargo box 2, and the front end of the right folding plate 120 is connected to the cab 1; the top folding plate 130 is located above the gap between the cab 1 and the cargo box 2, and the front end of the top folding plate 130 is connected to the cab 1.

[0045] When the left folding plate 110, the right folding plate 120 and the top folding plate 130 are fully unfolded, the gap between the cab 1 and the cargo box 2 can be sealed, greatly reducing the strong airflow vortex formed in this gap during driving, eliminating the resulting local vacuum area, effectively reducing the air resistance coefficient of the tractor, and thus reducing the air resistance of the truck train at high speed and reducing energy costs.

[0046] The left folding plate 110, the right folding plate 120, and the top folding plate 130 are all composed of at least two plate units connected sequentially. The number of plate units can be selected according to the gap width. The plate units themselves can be folded, and the folding method can be a sliding rail folding method, such as... Figure 6 As shown, it can also be a roll-up type or a corrugated type; the folding form is existing technology. The connection method between the plate units can be riveted or a bearing combined with a track. The material of the plate units can be aluminum alloy, steel, or composite materials.

[0047] Folding rods 500, which support the folding plate assembly as it unfolds and retracts, are provided on the left folding plate 110, right folding plate 120, and top folding plate 130. Figure 3 As shown, the folding rod 500 is an X-shaped structure composed of two rods hinged together in the middle. Slide grooves 510 are provided on both sides of the edges of the first and last plate units. A slider is provided at the end of each rod and hinged to it. The slider and the slide groove 510 work together to form a linear guide mechanism. As the folding plate assembly unfolds, the ends of the rods slide towards the inner end of the slide groove 510, changing the X-shaped structure from a horizontally folded state to a vertically unfolded state, thus supporting the folding plate assembly and making the overall structure more stable. Figure 3 As shown, the solid line represents the horizontally retracted state of the X-shaped structure, the dashed line represents the vertically unfolded state of the X-shaped structure, and the arrow direction indicates the movement direction of the rod when changing from the horizontally retracted state to the vertically unfolded state.

[0048] The guide assembly 200 is a telescopic rod-shaped guide mechanism used to guide the folding panel assembly to unfold and retract in a predetermined direction. Specifically, the guide assembly 200 includes: a guide power source, a left telescopic rod 210, and a right telescopic rod 220. The extension and retraction of the left telescopic rod 210 and the right telescopic rod 220 are controlled by the guide power source, which can be an electric power source or a pneumatic power source; that is, the left telescopic rod 210 and the right telescopic rod 220 can be electric telescopic rods or cylinders.

[0049] The left telescopic bar 210 is located at the upper left of the rear side of the cab 1, and the right telescopic bar 220 is located at the upper right of the rear side of the cab 1. The fixed ends of the left and right telescopic bars 210 and 220 are connected to the left and right sides of the rear side of the cab 1. The actuating end of the left telescopic bar 210 is connected to the end of the left folding plate 110, the left end of the top folding plate 130, and the end of the recovery assembly 300. Simultaneously, the right telescopic bar 220 is connected to the end of the right folding plate 120, the right end of the top folding plate 130, and the end of the recovery assembly 300. When the left and right telescopic bars 210 and 220 extend, they unfold the folding plate assembly, and the recovery assembly 300 extends towards the cargo box.

[0050] The recycling component 300 is used to recycle the folding panel assembly. The recycling component 300 includes a one-way locking mechanism and an automatic recycling mechanism.

[0051] The automatic recovery mechanism includes: a housing 310, a coil spring, a shaft, and a recovery line 320. The housing 310 is mounted on the cab. The shaft is housed inside the housing 310 via bearings, allowing it to rotate within the housing. The shaft is connected to the housing 310 via a coil spring, which enables the shaft to return to its original position. One end of the recovery line 320 is connected to the shaft, i.e., wound around it, and the other end is connected to the operating ends of the left telescopic rod 210 and the right telescopic rod 220.

[0052] When the left telescopic rod 210 and the right telescopic rod 220 extend, they cause the folding plate assembly to unfold, and at the same time the recovery line is stretched. When the one-way locking mechanism and the electromagnet assembly disconnect the limit on the recovery assembly, the coil spring drives the shaft to rotate, wrapping the recovery line around itself, thus shortening the recovery line and pulling the folding plate assembly and the guide assembly back to their original state, that is, switching to the recovery state.

[0053] The recovery line can be made of rope or chain.

[0054] The one-way locking mechanism includes a locking power source and a ratchet mechanism. The locking power source is connected to the pawl in the ratchet mechanism, and the ratchet in the ratchet mechanism is mounted on a shaft. The locking power source can be an electric power source or a pneumatic power source, meaning that the locking function of the one-way locking mechanism can be pneumatically or electrically controlled. Specifically, an electric telescopic rod or cylinder can be configured to connect to the pawl in the ratchet mechanism. When the electric telescopic rod or cylinder extends, it causes the pawl to disengage from the ratchet. When the electric telescopic rod or cylinder retracts, it causes the pawl to press against the surface of the ratchet and engage with the teeth on the ratchet, so that the ratchet can only rotate in one direction and cannot rotate in the opposite direction.

[0055] When the left telescopic rod 210 and the right telescopic rod 220 extend, they cause the folding plate assembly to unfold, and the retraction line is stretched. At this time, the pawl is in close contact with the ratchet surface and engages with the teeth on the ratchet, allowing the ratchet to rotate in only one direction. Since the ratchet is mounted on the shaft, the shaft can also rotate in only one direction. When the locking power source receives a control command, it drives the pawl to disengage from the ratchet, allowing the ratchet to rotate in the opposite direction. At this time, the shaft can rotate freely, and the ratchet no longer limits its movement. Then, the coil spring drives the shaft to rotate, shortening the retraction line and pulling the folding plate assembly and guide assembly back to their original state, thus switching to the retraction state.

[0056] The first working process of the one-way locking mechanism: When the guide assembly 200 extends backward with the folding plate assembly under the power or air supply, the recovery line carried by the ratchet and the shaft roller moves unidirectionally with the guide assembly and the folding plate assembly.

[0057] The second working process of the one-way locking mechanism: After the power / air supply is interrupted, the ratchet loses the limit of the pawl, that is, the reverse locking function is closed, the spring force tightens the recovery line it carries, and at the same time, it retracts the guide assembly and the folding plate assembly fixed to it.

[0058] The electromagnet assembly 400 is used to connect and fix the folding plate assembly to the cargo box 2 after it is unfolded, and to transmit contact signals. Specifically, it includes several electromagnets 410, which are evenly spaced at the end edges of the left folding plate 110, the right folding plate 120, and the top folding plate 130. For non-ferrous cargo boxes, ferrous connection points can be set around them.

[0059] The detection mechanism is used to check whether the folding panel assembly is properly connected to the cargo box. The detection mechanism can be a structure integrated with the electromagnet 410 that can transmit contact signals; detecting a contact signal proves that the folding panel assembly is properly connected. Alternatively, the detection mechanism can be a sensor or camera located at the end of the guide assembly. The sensor can be a pressure sensor; when the guide assembly extends into place, pressure is generated between the pressure sensor and the mating point on the cargo box. When the pressure value reaches a preset value, it proves that the folding panel assembly is properly connected. The camera captures real-time images of markings in the cargo box connection area, such as reflective markings or specific geometric patterns. Through edge detection algorithms and template matching, the alignment deviation between the markings and the baseline is calculated. If the deviation is ≤2 pixels, the folding panel assembly is considered properly connected.

[0060] When the controller issues a command, the guide assembly 200 extends backward along with the left folding plate 110, the right folding plate 120, the top folding plate 130, and the recycling line in the recycling assembly 300 until it contacts the cargo box 2. At the same time, the electromagnet 410 is energized and attracts the cargo box 2 for fixation. The folding rod 500 moves with the left folding plate 110, the right folding plate 120, and the top folding plate 130.

[0061] Upon receiving a recycling command or upon a power / gas failure, the one-way locking function of the recycling component 300 is deactivated. Simultaneously, the electromagnet 410 loses its attraction force, and the recycling component 300 tightens using spring force, carrying the guide component 200, the left folding plate 110, the right folding plate 120, and the top folding plate 130 for recycling and folding. The folding rod 500 moves with the left folding plate 110, the right folding plate 120, and the top folding plate 130.

[0062] During vehicle maintenance, the vehicle is in a condition that meets the closing requirements, the folding panel assembly is in a retracted state, no additional operation is required, and it does not affect the operation of raising and lowering the platform or lifting the cab.

[0063] The controller includes:

[0064] The self-test module is used for controller self-test. If the controller self-test result is normal, the vehicle speed signal is detected and sent to the initial judgment module. If the controller self-test result is faulty, the fault data is reported and the actuator does not move, that is, the guide device does not perform any action.

[0065] The initial judgment module is used to determine whether the current vehicle speed V satisfies V≥30km / h.

[0066] The unfolding judgment module is used to detect whether the device has been activated when the judgment result of the initial judgment module is negative, that is, to determine whether the flow guiding device has been unfolded.

[0067] The secondary judgment module is used to determine whether the current vehicle speed V satisfies V≥50km / h when the judgment result of the initial judgment module is yes.

[0068] The control start module is used to start the device when the judgment result of the secondary judgment module is yes, that is, to send a control command to the guide component 200 to control the guide component 200 to drive the folding plate component to perform the unfolding action, that is, the left telescopic rod 210 and the right telescopic rod 220 extend, driving the left folding plate 110, the right folding plate 120 and the top folding plate 130 to unfold, while the retraction component 300 extends to the cargo box side.

[0069] The control and recovery module is used to recover the device when the determination result of the unfolding judgment module is yes. That is, it sends a control command to the one-way locking mechanism and the electromagnet assembly to control the one-way locking mechanism and the electromagnet assembly to turn off the limit on the recovery component, so that the recovery component drives the folding plate assembly to perform the recovery action. That is, the electromagnet 410 is de-energized and loses its attraction force, the pawl leaves the ratchet, the shaft can rotate in the opposite direction, and the folding plate assembly is driven back to its original state by the spring force.

[0070] The connection determination module is used to determine whether a connection signal uploaded by the testing agency has been received, i.e., to detect whether the connection is in place.

[0071] The control stop module is used to send a control command to the guide component to control the guide component to stop its operation when the judgment result of the connection judgment module is yes.

[0072] The notification counting module is used to send a notification message to the control recycling module and the control startup module when the judgment result of the connection judgment module is negative, so as to notify the control recycling module to execute the recycling process, and after the recycling process is completed, notify the control startup module to execute the expansion process, and determine whether the number of times the expansion process is executed, N, satisfies N>3.

[0073] If the connection fails, the device will retract and try again once. The retraction process involves sending control commands to the one-way locking mechanism and the electromagnet assembly to control the one-way locking mechanism and the electromagnet assembly to disconnect the limit on the retraction component, so that the retraction component drives the folding plate assembly to perform the retraction action. The unfolding process involves sending control commands to the guide assembly 200 to control the guide assembly 200 to drive the folding plate assembly to perform the unfolding action.

[0074] The recycling reporting module is used to notify the control recycling module to execute the recycling process and upload fault data when the judgment result of the notification counting module is yes.

[0075] This application addresses the issue of increased energy consumption due to high wind resistance caused by the main-coupling gap when a vehicle train is traveling at high speeds. The high wind resistance caused by the main-coupling gap occurs when the vehicle train is traveling at high speeds, during which it does not make sharp turns. Sharp turns only occur at lower speeds, where wind resistance has a negligible impact on energy consumption. Therefore, this application sets the speed thresholds at 30 km / h and 50 km / h, which better reflects actual usage and improves the wind resistance reduction effect.

[0076] The primary purpose of the main-trailer clearance is to accommodate the angle created by large-angle turns, where the side clearance decreases as the angle increases. Closing the main-trailer clearance at this angle would damage the device. The passive retraction of the side deflectors by the trailer pressing against them, regardless of whether the retraction mechanism uses pulleys or lubrication to reduce resistance, will exert a Y-axis force on the side deflectors, resulting in poor reliability. If there are protrusions on the side of the cargo box, it will directly cause serious damage to the device. This application features a more rational structural design and a more reliable fixing method.

[0077] This application not only solves the problems of high wind resistance and high energy consumption caused by high-speed driving, but also avoids the possibility of damage to the deflector device. The strategy is to control the deflector device to close the main-mounted gap according to the vehicle speed. Turning operations that may damage the device should be performed when the vehicle is at low speed. At this time, there is no high wind resistance and there is no need to close the main-mounted gap. The deflector device has been retracted according to the strategy.

[0078] The deflector device provided in this application achieves active control retraction and automatic retraction upon power failure / gas outage. During high-speed driving, the vehicle will not make sharp turns. The folding plate assembly has a certain degree of flexibility, meeting the needs of small-angle directional adjustments and ramp cornering during high-speed driving. When making sharp turns, the vehicle speed will not exceed 30 km / h. At this time, the deflector device has already been retracted via control commands, eliminating the possibility of collision. When parking or maintenance is required, the deflector device is in the retracted state by default, without affecting the access platform or maintenance convenience.

[0079] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A tractor-trailer gap adjustment system, characterized in that, include: Flow guiding device and controller; The flow guiding device includes: a folding plate assembly, a guiding assembly, a recycling assembly, and an electromagnet assembly, wherein the recycling assembly includes: a one-way locking mechanism; The controller includes: The initial judgment module is used to determine whether the current vehicle speed V satisfies V≥30km / h; The unfolding judgment module is used to determine whether the flow guiding device has been unfolded when the judgment result of the initial judgment module is negative. The secondary judgment module is used to determine whether the current vehicle speed V satisfies V≥50km / h when the judgment result of the initial judgment module is yes; The control start module is used to send a control command to the guide component when the determination result of the secondary judgment module is yes, so as to control the guide component to drive the folding plate component to perform an unfolding action; The control and recycling module is used to send control commands to the one-way locking mechanism and the electromagnet assembly when the determination result of the unfolding judgment module is yes, so as to control the one-way locking mechanism and the electromagnet assembly to turn off the limit on the recycling component, so that the recycling component drives the folding plate assembly to perform the recycling action.

2. The tractor-trailer clearance adjustment system according to claim 1, characterized in that, The flow guiding device further includes a detection mechanism for detecting whether the folding panel assembly is properly connected to the cargo box; The controller also includes: The connection determination module is used to determine whether a connection signal has been received from the detection mechanism. The control stop module is used to send a control command to the guide component when the judgment result of the connection judgment module is yes, so as to control the guide component to stop its operation; The notification counting module is used to send a notification message to the control recycling module and the control start module when the judgment result of the connection judgment module is negative, so as to notify the control recycling module to execute the recycling process, and after the recycling process is completed, notify the control start module to execute the expansion process, and determine whether the number of times the expansion process is executed N satisfies N>3. The recycling reporting module is used to notify the control recycling module to execute the recycling process and upload fault data when the judgment result of the notification counting module is yes.

3. The tractor-trailer clearance adjustment system according to claim 2, characterized in that, The folding plate assembly includes: The left-side folding panel is located on the left side of the gap between the cab and the cargo box, and its front end is connected to the cab. The right-side folding panel is located on the right side of the gap between the cab and the cargo box, and its front end is connected to the cab. A top-mounted folding panel is installed above the gap between the cab and the cargo box, and its front end is connected to the cab. The left folding plate, the right folding plate, and the top folding plate are all composed of at least two plate units connected in sequence.

4. A tractor-trailer clearance adjustment system according to claim 3, characterized in that, The guiding assembly includes: a guiding power source, a left telescopic rod, and a right telescopic rod; the left telescopic rod is located at the upper left of the rear of the cab, and the right telescopic rod is located at the upper right of the rear of the cab; the actuating end of the left telescopic rod is connected to the end of the left folding plate and the left end of the top folding plate, and the right telescopic rod is connected to the end of the right folding plate and the right end of the top folding plate.

5. A tractor-trailer clearance adjustment system according to claim 4, characterized in that, The recycling assembly further includes an automatic recycling mechanism; the automatic recycling mechanism includes a housing, a coil spring, a roller, and a recycling line, the roller is connected to the housing via the coil spring, one end of the recycling line is connected to the roller, and the other end is connected to the actuating end of the left telescopic rod and the actuating end of the right telescopic rod.

6. A tractor-trailer clearance adjustment system according to claim 5, characterized in that, The one-way locking mechanism includes a locking power source and a ratchet mechanism. The locking power source is connected to the pawl in the ratchet mechanism, and the ratchet in the ratchet mechanism is disposed on the shaft.

7. A tractor-trailer clearance adjustment system according to claim 6, characterized in that, The electromagnet assembly includes a plurality of electromagnets, which are evenly spaced at the end edges of the left folding plate, the right folding plate, and the top folding plate.

8. A tractor-trailer clearance adjustment system according to claim 7, characterized in that, The flow guiding device further includes a folding rod, which is provided on the left folding plate, the right folding plate, and the top folding plate.

9. A tractor-trailer clearance adjustment system according to claim 8, characterized in that, The guiding power source and the locking power source are either electric or pneumatic power sources.

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