Aircraft tug cab lift and method of operation

Abstract

The present application relates to the technical field of civil aviation special vehicle, especially to an aircraft tractor cab lifting device and its operation method, which comprises a cab bracket with a side plate, the side plate being fixedly connected with the cab; a guide assembly comprising a guide plate, the bottom of the guide plate being adapted to be fixed on a vehicle frame and internally slidably connected with a guide piece, the guide piece being in contact with the guide plate through an anti-deviation wheel, the guide piece being fixedly connected with the side plate; the guide assembly being orthogonally multidimensional limiting, the spatial freedom of the cab bracket in the lifting process being limited through the orthogonal guide surface and the rolling fit between the guide plate and the guide piece, preventing the cab bracket from producing lateral and longitudinal trajectory deviation; and a driving assembly comprising a lifting oil cylinder, the telescopic end of the lifting oil cylinder being connected with the top of the side plate and the non-telescopic end being fixed with the vehicle frame. The present application makes the power output of the lifting oil cylinder stable through the cooperation of the anti-deviation wheel and the guide groove, the cab is uniformly lifted, and the effect of stable lifting is realized.

Description

Technical Field

[0001] This invention relates to the field of civil aviation special vehicle technology, and in particular to an aircraft tractor cab lifting device and its operating method. Background Technology

[0002] As a core special vehicle in the ground operation support of civil aviation airports, the main function of aircraft towing vehicles is to achieve precise movement, push-out, and towing operations of aircraft on the ground. During the towing process, the driver's accurate judgment of the towing path and real-time observation of the towing bar connection status are key factors in ensuring operational safety, which are highly dependent on the field of vision provided by the cab.

[0003] Currently, most aircraft towing vehicle cabs use a fixed-height design. While this design is structurally simple, it has significant drawbacks in practical applications: when towing large, wide-body aircraft with tall fuselages, the fixed and relatively low cab height easily obstructs the driver's view, creating large blind spots. This not only affects the prediction of the towing path ahead but also makes it difficult for the driver to clearly observe the actual status of the connection between the towing rod and the aircraft, thus increasing safety risks such as scratches, deviation from the track, and even disengagement.

[0004] To address the aforementioned problem of limited visibility, existing technologies have proposed liftable cab structures. However, these structures suffer from drawbacks such as complex structural design, insufficient lifting and operational stability, and high maintenance costs.

[0005] Therefore, how to design an aircraft tractor cab lifting device that is stable in lifting process, highly accurate in positioning, highly reliable and easy to maintain, while ensuring the overall compact structure of the tractor, in order to meet the growing demand for efficient and safe operation of civil aviation airports, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In this section, as well as in the abstract and title of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract, and the title of this application, and such simplifications or omissions shall not be used to limit the scope of the invention.

[0007] To address the shortcomings of existing technologies, one objective of this invention is to provide an aircraft tractor cab lifting device.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: an aircraft tractor cab lifting device, comprising a cab bracket having a side plate, the side plate being fixedly connected to the cab; a guide assembly comprising a guide plate, the bottom of which is adapted to be fixed on the frame, and a guide member slidably connected inside, the guide member and the guide plate being in contact via anti-deviation wheels, the guide member being fixedly connected to the side plate; the guide assembly is an orthogonal multi-dimensional limiting device, which restricts the spatial freedom of the cab bracket during the lifting process and prevents it from generating lateral and longitudinal trajectory deviations through the orthogonal guiding surface and rolling cooperation between the guide plate and the guide member; and a drive assembly comprising a lifting cylinder, the telescopic end of which is connected to the top of the side plate, and the non-telescopic end is fixed to the frame.

[0009] As a preferred embodiment of the aircraft tractor cab lifting device of the present invention, the cab bracket further includes a support plate, which extends through the bottom of the side plate and is perpendicularly connected to the side plate.

[0010] As a preferred embodiment of the aircraft tractor cab lifting device of the present invention, the guide plate is symmetrically arranged in two pieces, each guide plate including a first guide surface and a second guide surface, one side of the second guide surface is arranged perpendicular to the side plate, and one side of the first guide surface is arranged perpendicular to the second guide surface, forming an orthogonal multidimensional limiting of the guide assembly.

[0011] As a preferred embodiment of the aircraft tractor cab lifting device of the present invention, wherein: a first guide groove is provided on the first guide surface, a second guide groove is provided on the second guide surface, and the anti-deviation wheel is installed on the guide member at a position corresponding to the first guide groove and the second guide groove; the first guide groove and the second guide groove cooperate to form an orthogonal guide surface between the guide plate and the guide member.

[0012] As a preferred embodiment of the aircraft tractor cab lifting device of the present invention, the drive assembly further includes a support and a connecting plate; the support is fixed to the frame and hinged to the non-telescopic end of the lifting cylinder; the connecting plate is fixed to the top of the side plate and hinged to the telescopic end of the lifting cylinder.

[0013] As a preferred embodiment of the aircraft tractor cab lifting device of the present invention, it further includes a reinforcing component, the reinforcing component including a first reinforcing plate, the first reinforcing plate being disposed between the side plate and the guide member to increase the connection strength between the side plate and the guide member.

[0014] As a preferred embodiment of the aircraft tractor cab lifting device of the present invention, the reinforcing component further includes a second reinforcing plate, one side of which is fixedly connected to the top of the side plate, and both ends are respectively connected to the first reinforcing plate and the connecting plate, so as to stabilize the lifting force of the lifting cylinder on the cab bracket.

[0015] As a preferred embodiment of the aircraft tractor cab lifting device of the present invention, the reinforcing component further includes a third reinforcing plate, which is obliquely disposed between the first reinforcing plate and the connecting plate, and its side is fixed to the side plate.

[0016] In a preferred embodiment of the aircraft tractor cab lifting device of the present invention, the reinforcing assembly further includes a fourth reinforcing plate and a fifth reinforcing plate. The fourth reinforcing plate is fixed to the side plate on one side, and one end of it is vertically connected to the support plate, while the other end is connected to the third reinforcing plate. The fifth reinforcing plate is fixed to the side plate on one side, and one end of it is connected to the first reinforcing plate, while the other end is connected to the support plate, thereby increasing the connection strength between the support plate and the side plate.

[0017] As a preferred embodiment of the aircraft tractor cab lifting device of the present invention, it further includes a hydraulic control system, which includes a sensor assembly for collecting height data of the cab bracket, obstacle information, and pressure data of the lifting cylinder; a proportional control valve disposed in the hydraulic circuit of the lifting cylinder for regulating the flow rate of hydraulic oil flowing into the lifting cylinder; and a controller electrically connected to the sensor assembly and the proportional control valve, the controller being configured to execute segmented drive logic based on the height data.

[0018] The beneficial effects of the aircraft towing vehicle cab lifting device of this invention are as follows: By installing the aircraft towing vehicle cab lifting device on the cab, the driver's field of vision is optimized during operation. Specifically, the lifting action can raise the cab height to a level suitable for the field of vision of large aircraft, significantly improving the driver's observation range of the aircraft tow hook and the surrounding environment, thus enhancing the safety of towing operations. Simultaneously, this mechanism has a compact structure. Through the combination of a lifting cylinder and an anti-deviation wheel, the overall structure is compact, occupying little space and fitting the existing aircraft towing vehicle frame installation space. The anti-deviation wheel, in conjunction with the guide groove, ensures stable power output from the lifting cylinder, allowing the cab to rise and fall at a uniform speed, achieving a smooth lifting effect. Finally, both the anti-deviation wheel and the lifting cylinder are made from mature industrial-grade components, adaptable to the complex operating conditions of airports, reducing maintenance frequency, and making the device structure more reliable.

[0019] To address the shortcomings of existing technologies, another objective of this invention is to provide an operating method for an aircraft tractor cab lifting device.

[0020] To achieve the above objectives, the present invention adopts the following technical solution: an operation method for an aircraft tractor cab lifting device, applied to an aircraft tractor cab lifting device, comprising the following steps: S1, preparation stage: the hydraulic system pressure of the lifting cylinder and the coupling state of the guide component are detected by the sensor assembly, and after confirming that there are no abnormalities, it enters the standby state; S2, lifting stage: the controller drives the proportional control valve to open, adjusts the flow of hydraulic oil flowing into the lifting cylinder, drives the extension end of the lifting cylinder to extend, drives the cab bracket to rise and fall along the guide component, and achieves smooth lifting of the cab through the rolling cooperation of the anti-deviation wheel in the first guide groove and the second guide groove; S3, high position holding stage: when the controller determines that the cab has reached the target height according to the height data, it stops the drive of the proportional control valve and locks the hydraulic circuit, strengthens the structural support and distribution of the load on the cab by the component; S4, lowering stage: the controller controls the proportional control valve to return according to the preset flow rate, drives the cab to move downward, and at the same time the anti-deviation wheel rolls in the guide groove to correct the deviation of the guide component.

[0021] As a preferred embodiment of the operating method described in this invention, in step S2, the controller controls the proportional control valve to execute segmented drive logic based on the real-time collected height data. When the cab is far from the target height, it is rapidly lifted at a first speed; when the cab enters the preset buffer zone, it switches to a second speed lower than the first speed to slowly lift until the target height is reached.

[0022] In a preferred embodiment of the operating method described in this invention, in step S4, before retraction, the controller uses a sensor assembly to collect information on obstacles below the cab; if an obstacle is detected, retraction is prohibited; if no obstacle is detected, the proportional control valve is controlled to retract slowly at a uniform speed, and pressure data is monitored in real time, and the guide offset is corrected in real time by the rolling cooperation between the anti-deviation wheel and the guide groove.

[0023] As a preferred embodiment of the operating method described in this invention, it further includes an emergency operation step S5: when a hydraulic control system malfunction is detected, the hydraulic oil in the lifting cylinder is slowly released under manual control by starting the manual emergency pump, so that the cab slowly descends to a safe position under the structural support of the reinforcing components and the guiding constraints of the guiding components.

[0024] The beneficial effects of the operation method of the aircraft tractor cab lifting device of the present invention are the same as those of the aircraft tractor cab lifting device described above, and will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. 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.

[0026] Figure 1 This is a three-dimensional structural diagram of the aircraft tractor cab lifting device of the present invention.

[0027] Figure 2 This is a three-dimensional structural diagram of the aircraft tractor cab lifting device of the present invention without the guide plate.

[0028] Figure 3 This is a top view of the aircraft tractor cab lifting device of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the aircraft tractor cab lifting device and the cab of the present invention. Detailed Implementation

[0030] To make the objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1

[0034] Reference Figure 1 and Figure 2 This is the first embodiment of the present invention. This embodiment provides an aircraft towing vehicle cab lifting device that can achieve the effect of smoothly lifting objects. It includes: a cab bracket 100, a guide component 200 and a drive component 300. The cab bracket 100 forms the main body of the aircraft towing vehicle cab lifting device. The drive component 300 provides the source power for the lifting action. The guide component 200 improves the stability of the lifting.

[0035] Specifically, the cab bracket 100 includes a side plate 101, which is made of metal plate and is fixedly connected to the cab M on one side by bolts. The other side is connected to the drive assembly 300 and the guide assembly 200. The side plate 101 facilitates the connection between the entire device and the cab M.

[0036] The cockpit bracket 100 also includes a support plate 102, which is formed by bending a metal plate. The middle part is arched upward in a convex shape to fit the shape of the cockpit M and is fixedly connected to the bottom surface of the cockpit M. The installation of the side plate 101 and the support plate 102 enhances the stability of the connection between the aircraft tractor cockpit lifting device and the cockpit M.

[0037] Preferably, the support plate 102 extends through the bottom of the side plate 101 and is vertically connected to the side plate 101, with the through end slightly protruding from the side plate 101 to enhance the connection strength between the support plate 102 and the side plate 101.

[0038] Furthermore, the guide assembly 200 includes a guide plate 201, which is formed by bending a metal plate and whose bottom surface is fixed to the frame (the frame is not shown in the figure).

[0039] Two guide plates 201 are symmetrically arranged. Each guide plate 201 includes a first guide surface 201a and a second guide surface 201b. One side of the second guide surface 201b is vertically fixed to the side plate 101, and one side of the first guide surface 201a is vertically fixed to the other side of the second guide surface 201b, forming an orthogonal multidimensional limiting structure for the guide assembly 200. The structural design of the guide plate 201 effectively confines the internally slidingly connected guide component 202 within it.

[0040] The guide 202 is made of metal square tube, and one side of it is fixedly connected to the side plate 101 to guide the cab bracket 100 to slide along the guide plate 201, so as to prevent the cab bracket 100 from shifting and shaking during the lifting process.

[0041] Understandably, the symmetrical second guide surface 201b restricts the swaying of the guide member 202 in the direction parallel to the side plate 101, i.e., lateral swaying; the first guide surface 201a and the side plate 101 restrict the swaying of the guide member 202 in the direction perpendicular to the side plate 101, i.e., longitudinal swaying.

[0042] A first guide groove 201c is provided on the first guide surface 201a, and the first guide groove 201c is formed by two metal plates being welded perpendicularly to the first guide surface 201a at equal intervals. A second guide groove 201d is provided on the second guide surface 201b, and the second guide groove 201d is formed by two metal plates being welded perpendicularly to the second guide surface 201b at equal intervals. The openings of the first guide groove 201c and the second guide groove 201d face two adjacent sides of the guide member 202, respectively.

[0043] Anti-deviation wheels 203 are respectively installed on the guide member 202 at positions opposite to the first guide groove 201c and the second guide groove 201d. The anti-deviation wheels 203 are bolt-loaded roller bearings. The guide member 202 and the guide plate 201 are in contact through the anti-deviation wheels 203, meaning the anti-deviation wheels 203 can roll along the first guide groove 201c and the second guide groove 201d respectively. The cooperation between the anti-deviation wheels 203 and the first guide groove 201c prevents the guide member 202 from shifting parallel to the side plate 101 (i.e., lateral shift); the cooperation between the anti-deviation wheels 203 and the second guide groove 201d prevents the guide member 202 from shifting perpendicular to the side plate 101 (i.e., longitudinal shift). The cooperation of the first guide groove 201c and the second guide groove 201d forms an orthogonal guide surface between the guide plate 201 and the guide member 202, effectively improving the stability of the lifting process.

[0044] By setting the first guide groove 201c and the second guide groove 201d, a small clearance is formed with the anti-deviation wheel 203, which can not only ensure the guiding accuracy, but also adapt to the small vibrations during the driving of the tractor.

[0045] The orthogonal multidimensional limiting of the guide component 200, the orthogonal guiding surface between the guide plate 201 and the guide member 202, and the rolling cooperation effectively limit the spatial freedom of the cab bracket 100 during the lifting process, preventing it from causing lateral and longitudinal trajectory deviations.

[0046] Furthermore, the drive assembly 300 includes a lifting cylinder 301, the telescopic end of which is connected to the top of the side plate 101, and the non-telescopic end is fixedly connected to the vehicle frame. The cab bracket 100 is lifted by moving the telescopic end of the lifting cylinder 301.

[0047] Specifically, the drive assembly 300 also includes a support 302 and a connecting plate 303.

[0048] The support 302 is made of metal plate and is symmetrically fixed on the frame. Each support 302 has a through hole, and a pin is inserted into the through hole. The pin also passes through the non-telescopic end of the lifting cylinder 301 so that the lifting cylinder 301 can rotate relative to the support 302 when it is in motion.

[0049] The connecting plates 303 are made of metal plates and are symmetrically fixedly installed on the top of the side plates 101. Each connecting plate 303 has a through hole, through which a pin passes. The pin also passes through the telescopic end of the lifting cylinder 301, so that the lifting cylinder 301 can rotate relative to the connecting plate 303 when it moves. Through the setting of the connecting plates 303, the telescopic movement of the lifting cylinder 301 is transmitted to the cab bracket 100.

[0050] Example 2

[0051] Reference Figures 1 to 4 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a reinforcing component 400 and a specific structure of the reinforcing component 400, which solves the problem of the overall strength of the aircraft tractor cab lifting device.

[0052] Specifically, the reinforcing component 400 includes a first reinforcing plate 401, which is formed by bending a metal plate at a 90-degree angle. One side of the first reinforcing plate 401 is fixedly connected to the side plate 101, and a guide member 202 is fixedly connected to the inside of the 90-degree bend. The first reinforcing plate 401 enhances the connection strength between the side plate 101 and the guide member 202.

[0053] Preferably, the first reinforcing plate 401 is symmetrically arranged and located on both sides of the lifting cylinder 301.

[0054] Furthermore, the reinforcing assembly 400 also includes two second reinforcing plates 402, respectively disposed on both sides of the two connecting plates 303. One end of each second reinforcing plate 402 is fixedly connected to the connecting plate 303, and the other end is fixedly connected to the first reinforcing plate 401, and the side is fixedly connected to the top of the side plate 101. This stabilizes the lifting force of the lifting cylinder 301 on the cab bracket 100.

[0055] Furthermore, the reinforcing component 400 also includes a third reinforcing plate 403, which is made of a metal plate. The third reinforcing plate 403 is inclined, with one end fixed to the first reinforcing plate 401 and the other end fixed to the connecting plate 303, while its side is fixed to the side plate 101 to enhance the stability of the first reinforcing plate 401.

[0056] Furthermore, the reinforcing component 400 also includes a fourth reinforcing plate 404 and a fifth reinforcing plate 405, which are each made of metal plates.

[0057] The fourth reinforcing plate 404 is fixed to the side plate 101 on one side, and one end of it is vertically connected to the through end of the support plate 102, while the other end is connected to the third reinforcing plate 403 to enhance the stability of the connection between the side plate 101 and the support plate 102.

[0058] The fifth reinforcing plate 405 is fixed to the side plate 101 on one side, and one end of it is fixedly connected to the first reinforcing plate 401, and the other end is fixedly connected to the through end of the support plate 102; so as to increase the connection strength between the support plate 102, the side plate 101 and the first reinforcing plate 401.

[0059] By incorporating the reinforcing component 400, the overall strength of the aircraft tractor cab lifting device is effectively improved, making it more stable and durable during lifting. The simple structure of the plate also reduces the difficulty of maintenance.

[0060] The rest of the structure is the same as in Example 1.

[0061] Working principle: Before using this device, the cab M is fixed to the cab bracket 100. When towing a large aircraft, the pilot operates the control switch of the lifting cylinder 301 in the cab M. The extension end of the lifting cylinder 301 extends, pushing the cab bracket 100 to a high position to obtain a good view. After the towing operation is completed, the control switch of the lifting cylinder 301 is operated again to lower the cab to a low position to lower the vehicle's center of gravity and improve driving stability.

[0062] In summary, by installing an aircraft towing vehicle cab lifting device on the cab M, the driver's field of vision is optimized during operation. Specifically, the cab height can be raised to meet the field of vision requirements of large aircraft through the lifting action, which significantly improves the driver's observation range of the aircraft towing hook and the surrounding environment, and enhances the safety of towing operations.

[0063] This device adopts a combination of lifting cylinder 301 and anti-deviation wheel 203, with a compact overall structure and small footprint, and is compatible with the frame installation space of existing aircraft towing vehicles.

[0064] By cooperating with the anti-eccentric wheel 203, the power output of the lifting cylinder is stabilized, and the cab is raised and lowered at a uniform speed, thus achieving a smooth lifting effect.

[0065] Finally, both the anti-deviation wheel 203 and the lifting cylinder 301 are made of mature industrial-grade components, which can adapt to the complex operating conditions of the airport, reduce the maintenance frequency, and make the structure of this device more reliable.

[0066] Example 3

[0067] This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a hydraulic control system for the aircraft tractor cab lifting device described in the present invention. By introducing a closed-loop control hydraulic system, intelligent, smooth and safe management of the cab lifting process is achieved.

[0068] The hydraulic control system specifically includes a sensor assembly consisting of a height sensor and a pressure sensor. The height sensor (such as a wire-type displacement sensor or a laser rangefinder) is mounted on the side of the side plate 101 of the cab bracket 100 to provide real-time feedback on the vertical position coordinates of the cab relative to the chassis. The pressure sensor is located in the oil inlet chamber of the lifting cylinder 301 to monitor the load pressure of the hydraulic system, thereby indirectly determining whether there is a risk of overloading or uneven loading of the cab.

[0069] The proportional control valve integrated into the main hydraulic circuit of the lifting cylinder 301 has a continuously adjustable flow rate. It receives current signals through an electromagnetic coil to precisely control the valve opening, thereby achieving stepless adjustment of the hydraulic oil flow rate entering the lifting cylinder 301.

[0070] And the controller, such as a programmable logic controller (PLC), is the core of the system. Its input is electrically connected to the sensor assembly, and its output is electrically connected to the drive circuit of the proportional control valve.

[0071] The controller is equipped with a segmented drive logic algorithm to optimize the smoothness of lifting and lowering and the positioning accuracy.

[0072] First, the rapid crossing stage: After receiving the lifting command, the controller, based on the current position fed back by the height sensor, if the distance to the target height is large, drives the proportional control valve to open to the position with a large flow rate, so that the lifting cylinder 301 can quickly lift and lower at the first speed (high speed), shortening the operation preparation time.

[0073] Second, buffer deceleration stage: When the sensor data detects that the cab has entered the preset "buffer zone" (e.g., within the range of target height - 100mm) in front of the target height, the controller reduces the opening of the proportional control valve through the PWM signal to smoothly reduce the flow, so that the lifting cylinder 301 runs at a second speed (low speed) lower than the first speed.

[0074] Third, the precise positioning stage: At the second speed, after the system detects that the height sensor data is consistent with the target value, the controller closes the proportional control valve and triggers the locking action of the hydraulic circuit to achieve precise and stable hovering of the cab at a high position.

[0075] The hydraulic control system and the guide assembly 200 work together to effectively prevent swaying during the lifting process.

[0076] Example 4

[0077] This is the fourth embodiment of the present invention. Unlike the previous embodiment, this embodiment provides an operation method for an aircraft tractor cab lifting device, utilizing the aforementioned aircraft tractor cab lifting device. This operation method achieves automation, precision, and high safety in the cab lifting process through closed-loop control of the hydraulic system by a controller.

[0078] S1. Preparation Phase: Upon system startup, the controller first triggers the preparation procedure. The system pressure of the lifting cylinder 301 is read by the sensor components to confirm that the pressure value is within the preset safety threshold range. If the pressure does not meet the threshold, the controller will lock subsequent lifting commands and issue an alarm. Simultaneously, by visual inspection or sensor checks, the anti-deviation wheels 203 in the guide assembly 200 are confirmed to be located within the first guide groove 201c and the second guide groove 201d, respectively, and that the anti-deviation wheels 203 are not stuck or excessively worn. This confirms that the cab bracket 100 and the cab M are in a locked connection state, and that the connections between the side plate 101 and the support plate 102 and the cab M are secure and reliable, preparing for subsequent lifting operations.

[0079] S2. Lifting Stage: After confirming that everything is in order during the preparation stage, the operator issues a lifting command and starts the lifting cylinder 301. The telescopic end of the lifting cylinder 301 begins to extend. Since the telescopic end is hinged to the top of the side plate 101 via the connecting plate 303, while the non-telescopic end is hinged to the frame via the support 302, the lifting cylinder 301 adaptively swings around the hinge point of the support 302 while extending, and pushes the side plate 101 and the cab M fixed thereto to move smoothly upward through the connecting plate 303.

[0080] After lifting begins, the controller drives the proportional control valve to regulate the flow rate into the lifting cylinder 301. During the high-speed lifting phase, the controller outputs a larger proportional current signal to drive the proportional control valve to operate at a larger opening, causing the cylinder to extend rapidly and achieving efficient lifting at the "first speed." The first speed is greater than the second speed; for example, the first speed could be 50 mm / s, and the second speed could be 10 mm / s. This segmented control improves lifting efficiency while ensuring the accuracy of final positioning, avoiding positioning deviations or structural impacts caused by inertial shocks.

[0081] During the segmented buffer phase, when the height data collected by the sensor components approaches the preset target height value (for example, entering a buffer zone 100mm away from the target position), the controller automatically reduces the signal strength and decreases the opening of the proportional control valve through a feedback algorithm, thereby achieving a smooth deceleration of the "second speed" and ensuring that the cab stops smoothly when it reaches the target position without impact load.

[0082] During this process, the guide member 202 fixed to the side plate 101 rises synchronously along the direction defined by the guide plate 201. Specifically, the second guide surfaces 201b of the two symmetrically arranged guide plates 201 work together to prevent the guide member 202 from deviating in a direction parallel to the side plate 101; while the first guide surface 201a works together with the side plate 101 to prevent the guide member 202 from deviating in a direction perpendicular to the side plate 101. At the same time, the anti-deviation wheels 203 installed on the guide member 202 roll in the first guide groove 201c and the second guide groove 201d respectively, replacing sliding friction with rolling friction, further guiding the movement of the guide member 202, effectively preventing the guide member 202 from deviating in any direction during the lifting process, and ensuring that the lifting process of the cab M is smooth and precise.

[0083] S3, High-Position Holding Stage: When the cab M reaches the required working height, the controller stops driving the proportional control valve, the hydraulic circuit switches to the locked state, and the position of the cylinder extension end is locked. At this time, the first reinforcing plate 401, the second reinforcing plate 402, and the third reinforcing plate 403 in the reinforcing assembly 400 work together to bear and distribute the load of the cab M and the cab bracket 100. Specifically, the first reinforcing plate 401 enhances the connection strength between the side plate 101 and the guide member 202, preventing deformation or breakage at the connection under heavy load; the second reinforcing plate 402 connects the top of the side plate 101, the first reinforcing plate 401, and the connecting plate 303, stably transmitting the lifting force of the lifting cylinder 301 to the entire cab bracket 100; the third reinforcing plate 403 is inclined between the first reinforcing plate 401 and the connecting plate 303, effectively dispersing the local stress exerted by the lifting cylinder 301 on the side plate 101, ensuring structural stability in the high-position holding state. The weight of the cab is evenly distributed to the frame, eliminating long-term load on the hydraulic cylinders and ensuring spatial stability during high-level operations.

[0084] S4. Descent Phase: Before the retraction cylinder retracts, the controller first activates the sensor assembly to scan for obstacles below the cab. If an obstacle is detected, the controller forcibly interrupts the retraction command and issues a warning.

[0085] If the environment is safe, the controller drives the proportional control valve to return the oil at a constant speed, guiding the cab to descend smoothly. Specifically, the extension end of the lifting cylinder 301 is retracted, and the hydraulic system controls the return oil flow through the proportional control valve. The extension end of the lifting cylinder 301 retracts slowly, driving the side plate 101 and the cab M downwards via the connecting plate 303. During this process, the guide member 202 slides downwards along the guide surface of the guide plate 201, and the anti-deviation wheel 203 rolls synchronously in the first guide groove 201c and the second guide groove 201d, ensuring the smoothness and directional accuracy of the descent. The lifting cylinder 301 continues to retract until the cab M returns to its initial position.

[0086] The lifting cylinder 301 retracts slowly and uniformly, with the descent speed controlled within 10 mm / s. Throughout the descent, the anti-eccentricity roller 203 maintains a tight rolling fit with the guide groove, which can correct any potential deviation of the guide component 202 in real time, even under eccentric load or external force interference, ensuring that the cab M lands smoothly.

[0087] S5. Emergency Operation Procedures: When the hydraulic system fails to drive the lifting cylinder 301 normally due to pump failure, pipeline leakage, or power failure, the operator shall initiate the emergency operation procedure. Specifically, the operator shall manually start the manual emergency pump connected in parallel with the hydraulic system, and slowly inject hydraulic oil into the return oil line of the lifting cylinder 301 by manually reciprocating the handle, so as to gradually open the hydraulic lock and slowly release the hydraulic oil in the lifting cylinder 301.

[0088] During the slow release of hydraulic oil, the telescopic end of the lifting cylinder 301 gradually retracts under the weight of the cab M and the cab bracket 100. Through the cooperation of the guide member 202 and the guide plate 201 of the guide assembly 200, and the rolling guidance of the anti-deviation wheel 203 and the guide groove, the guiding and anti-deviation functions continue to be performed, allowing the cab M to slowly descend to a safe position along the predetermined path, effectively ensuring the safety of the operators and equipment.

[0089] In summary, the operating method of this application achieves high efficiency, stability, and safety in the lifting and lowering operation of the aircraft tractor cab through safety confirmation in the preparation phase, precise guidance and anti-deviation control in the lifting and lowering phases, structural reinforcement in the high-position holding phase, and safety design in the emergency phase.

[0090] The rest of the structure is the same as in Example 3.

[0091] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A lifting device for the cab of an aircraft tractor, characterized in that: include A cab bracket (100) having a side plate (101) which can be fixedly connected to the cab (M); A guide assembly (200) includes a guide plate (201) whose bottom is adapted to be fixed to the vehicle frame, and a guide member (202) is slidably connected inside it. The guide member (202) contacts the guide plate (201) through an anti-deviation wheel (203), and the guide member (202) is fixedly connected to the side plate (101). The guide assembly (200) forms an orthogonal multi-dimensional limit, and through the orthogonal guide surface and rolling cooperation between the guide plate (201) and the guide member (202), it restricts the spatial freedom of the cab bracket (100) during the lifting process, preventing it from generating lateral and longitudinal trajectory deviations; and, The drive assembly (300) includes a lifting cylinder (301) whose telescopic end is connected to the top of the side plate (101) and whose non-telescopic end is fixed to the frame.

2. The aircraft tractor cab lifting device as described in claim 1, characterized in that: The cab bracket (100) also includes a support plate (102), which extends through the bottom of the side plate (101) and is vertically connected to the side plate (101).

3. The aircraft tractor cab lifting device as described in claim 2, characterized in that: The guide plate (201) is symmetrically configured in two pieces. Each guide plate (201) includes a first guide surface (201a) and a second guide surface (201b). One side of the second guide surface (201b) is perpendicular to the side plate (101), and one side of the first guide surface (201a) is perpendicular to the second guide surface (201b), forming an orthogonal multidimensional limit of the guide component (200).

4. The aircraft tractor cab lifting device as described in claim 3, characterized in that: A first guide groove (201c) is provided on the first guide surface (201a), and a second guide groove (201d) is provided on the second guide surface (201b). The anti-deviation wheel (203) is installed on the guide member (202) at the corresponding positions of the first guide groove (201c) and the second guide groove (201d). The first guide groove (201c) and the second guide groove (201d) cooperate to form an orthogonal guide surface between the guide plate (201) and the guide member (202).

5. The aircraft tractor cab lifting device as described in any one of claims 2 to 4, characterized in that: The drive assembly (300) also includes a support (302) and a connecting plate (303); the support (302) is fixed to the frame and hinged to the non-telescopic end of the lifting cylinder (301); the connecting plate (303) is fixed to the top of the side plate (101) and hinged to the telescopic end of the lifting cylinder (301).

6. The aircraft tractor cab lifting device as described in claim 5, characterized in that: It also includes a reinforcing component (400), which includes a first reinforcing plate (401) disposed between the side plate (101) and the guide member (202) to increase the connection strength between the side plate (101) and the guide member (202).

7. The aircraft tractor cab lifting device as described in claim 6, characterized in that: The reinforcing assembly (400) also includes a second reinforcing plate (402), one side of which is fixedly connected to the top of the side plate (101), and both ends are connected to the first reinforcing plate (401) and the connecting plate (303) respectively, so as to stabilize the lifting force of the lifting cylinder (301) on the cab bracket (100).

8. The aircraft tractor cab lifting device as described in claim 7, characterized in that: The reinforcing component (400) further includes a third reinforcing plate (403), which is inclinedly disposed between the first reinforcing plate (401) and the connecting plate (303), and its side is fixed to the side plate (101).

9. The aircraft tractor cab lifting device as described in claim 8, characterized in that: The reinforcing assembly (400) further includes a fourth reinforcing plate (404) and a fifth reinforcing plate (405). The fourth reinforcing plate (404) is fixed to the side plate (101) on one side, and one end of it is vertically connected to the support plate (102), while the other end is connected to the third reinforcing plate (403). The fifth reinforcing plate (405) is fixed to the side plate (101) on one side, and one end of it is connected to the first reinforcing plate (401), while the other end is connected to the support plate (102) to increase the connection strength between the support plate (102) and the side plate (101).

10. The aircraft tractor cab lifting device as described in claim 1, characterized in that: It also includes a hydraulic control system, which includes: The sensor assembly is used to collect height data of the cab bracket (100), obstacle information, and pressure data of the lifting cylinder (301); A proportional control valve is installed in the hydraulic circuit of the lifting cylinder (301) to regulate the flow rate of hydraulic oil flowing into the lifting cylinder (301); and The controller is electrically connected to the sensor assembly and the proportional control valve, and the controller can execute segmented drive logic based on the height data.

11. An operating method for an aircraft tractor cab lifting device, applied to an aircraft tractor cab lifting device, characterized in that, Includes the following steps: S1. Preparation stage: The hydraulic system pressure of the lifting cylinder (301) is detected by the sensor assembly. After confirming that there are no abnormalities, it enters the standby state. S2, Lifting Stage: The controller drives the proportional control valve to open, adjusts the flow of hydraulic oil into the lifting cylinder (301), drives the extension end of the lifting cylinder (301) to extend, drives the cab bracket (100) to rise and fall along the guide assembly (200), and achieves smooth lifting of the cab (M) through the rolling cooperation of the anti-eccentric wheel (203) in the first guide groove (201c) and the second guide groove (201d); S3, High-level holding stage: When the controller determines that the cab (M) has reached the target height based on the height data, it stops the drive of the proportional control valve and locks the hydraulic circuit. During this process, the reinforcing component (400) provides structural support for the load on the cab (M) and distributes the load. S4, Descent Phase: The controller controls the proportional control valve to return according to the preset flow rate, which drives the cab (M) to move downward. At the same time, the anti-deviation wheel (203) rolls in the guide groove to correct the deviation of the guide (202).

12. The method of operating the aircraft tractor cab lifting device as described in claim 11, characterized in that: In step S2, the controller controls the proportional control valve to execute segmented drive logic based on the real-time collected height data. When the cab (M) is far away from the target height, it is rapidly lifted at the first speed; when the cab (M) enters the preset buffer zone, it switches to the second speed, which is lower than the first speed, and slowly lifts the cab until the target height is reached.

13. The method of operating the aircraft tractor cab lifting device as described in claim 11 or 12, characterized in that: In step S4, before performing the retraction, the controller uses sensor components to collect information about obstacles below the cab (M); If an obstacle is detected, retraction is prohibited; if no obstacle is detected, the proportional control valve is controlled to retract slowly at a uniform speed, and the pressure data is monitored in real time. The anti-deviation wheel (203) and the guide groove are used to correct the trajectory deviation in real time.

14. The method of operating the aircraft tractor cab lifting device as described in claim 13, characterized in that: It also includes emergency operation step S5, which, when a hydraulic control system malfunction is detected, slowly releases the hydraulic oil in the lifting cylinder (301) under manual control by starting the manual emergency pump, so that the cab (M) slowly descends to a safe position under the structural support of the reinforcing component (400) and the guiding constraint of the guiding component (200).

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