Double-shaft double-wheel wheel holding mechanism, aircraft tractor and traction method

Abstract

The invention relates to the technical field of aircraft traction, in particular to a double-shaft double-wheel wheel holding mechanism, an aircraft tractor and a traction method. The wheel holding mechanism and the front wheel holding assembly are oppositely arranged through a first middle wheel holding part and a third middle wheel holding part, and a first wheel holding space is defined. A second wheel holding space is defined by oppositely arranging a second middle wheel holding part, a fourth middle wheel holding part and the rear wheel holding assembly. And the first wheel holding space and the second wheel holding space are adopted, so that the double-shaft double-wheel wheel pair can be held tightly. The aircraft tractor comprises the wheel holding mechanism. According to the traction method, during wheel holding operation, a remote controller, a signal receiver, a hydraulic control system and a steering adjusting system are combined and adopted, so that automatic wheel holding can be achieved, the requirement for holding operation of double-shaft double-wheel wheel pairs of different sizes can be met, and overall traction of an airplane can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft towing, and in particular to a double-axle double-wheel holding mechanism, an aircraft towing vehicle and a towing method. Background Art

[0002] The wheel-holding mechanism used in the existing wheel-holding aircraft tractors is mostly a mechanism composed of a front wheel-holding assembly and a rear wheel-holding assembly, which is used to achieve the holding and traction of a single-axle double-wheel structure, but cannot hold and traction the double-axle double-wheel structure of a heavy aircraft. Therefore, it is necessary to provide a double-axle double-wheel holding mechanism, an aircraft tractor and a traction method to solve the problem that the existing wheel-holding mechanism cannot hold and traction the double-axle double-wheel structure of a heavy aircraft. Summary of the invention

[0003] The object of the present invention is to provide a double-axle double-wheel holding mechanism, an aircraft tractor and a traction method, and the specific technical scheme is as follows:

[0004] In a first aspect, the present invention provides a dual-axle dual-wheel wheel-holding mechanism, comprising a mounting slot, a front wheel-holding assembly, a middle wheel-holding assembly and a rear wheel-holding assembly;

[0005] One end of the installation groove in the length direction is an open end, and the other end is a closed end;

[0006] The front wheel-holding assembly can be opened and closed on the open end of the mounting groove; the rear wheel-holding assembly can be slidably arranged in the closed end of the mounting groove and can be arranged close to or far away from the front wheel-holding assembly;

[0007] The middle wheel-holding assembly includes a first middle wheel-holding component and a second middle wheel-holding component; the first middle wheel-holding component and the second middle wheel-holding component are respectively slidably arranged close to or slidably arranged away from each other in the width direction of the mounting groove; the first middle wheel-holding component includes a first middle wheel-holding part and a second middle wheel-holding part; the second middle wheel-holding component includes a third middle wheel-holding part and a fourth middle wheel-holding part; the first middle wheel-holding part and the third middle wheel-holding part are arranged opposite to the front wheel-holding assembly to form a first wheel-holding space; the second middle wheel-holding part and the fourth middle wheel-holding part are arranged opposite to the rear wheel-holding assembly to form a second wheel-holding space.

[0008] Optionally, the first middle wheel-holding component further includes a first support frame slidably arranged in the mounting groove; the first middle wheel-holding component includes a first upper support shoe cylinder, a first upper wheel-holding piece, a first lower support shoe cylinder and a first lower wheel-holding piece; the first upper wheel-holding piece is arranged above the first lower wheel-holding piece; the first upper support shoe cylinder and the first lower support shoe cylinder are respectively arranged on the first support frame from top to bottom; the first upper wheel-holding piece is connected to the working end of the first upper support shoe cylinder; the first lower wheel-holding piece is connected to the working end of the first lower support shoe cylinder;

[0009] The second wheel-holding component in the middle part also includes a second support frame slidably arranged in the mounting groove; the third wheel-holding component in the middle part includes a third upper shoe-holding cylinder, a third upper wheel-holding piece, a third lower shoe-holding cylinder and a third lower wheel-holding piece; the third upper wheel-holding piece is arranged above the third lower wheel-holding piece; the third upper shoe-holding cylinder and the third lower shoe-holding cylinder are respectively arranged on the second support frame from top to bottom; the third upper wheel-holding piece is connected to the working end of the third upper shoe-holding cylinder; the third lower wheel-holding piece is connected to the working end of the third lower shoe-holding cylinder;

[0010] The first upper wheel-holding plate, the first lower wheel-holding plate, the third upper wheel-holding plate and the third lower wheel-holding plate are arranged facing the front wheel-holding assembly to enclose a first wheel-holding space.

[0011] Optionally, the second middle wheel holding component includes a second upper wheel holding shoe cylinder, a second upper wheel holding piece, a second lower wheel holding shoe cylinder and a second lower wheel holding piece; the second upper wheel holding piece is arranged above the second lower wheel holding piece; the second upper wheel holding shoe cylinder and the second lower wheel holding shoe cylinder are respectively arranged on the first support frame from top to bottom; the second upper wheel holding piece is connected to the working end of the second upper wheel holding shoe cylinder; the second lower wheel holding piece is connected to the working end of the second lower wheel holding shoe cylinder;

[0012] The fourth middle wheel holding component comprises a fourth upper shoe holding cylinder, a fourth upper wheel holding piece, a fourth lower shoe holding cylinder and a fourth lower wheel holding piece; the fourth upper wheel holding piece is arranged above the fourth lower wheel holding piece; the fourth upper shoe holding cylinder and the fourth lower shoe holding cylinder are respectively arranged on the second support frame from top to bottom; the fourth upper wheel holding piece is connected to the working end of the fourth upper shoe holding cylinder; the fourth lower wheel holding piece is connected to the working end of the fourth lower shoe holding cylinder;

[0013] The second upper wheel-holding plate, the second lower wheel-holding plate, the fourth upper wheel-holding plate and the fourth lower wheel-holding plate are arranged facing the rear wheel-holding assembly to enclose a second wheel-holding space.

[0014] Optionally, the first middle wheel-holding component further includes a first propulsion cylinder; a shell of the first propulsion cylinder is arranged on the mounting groove, and an operating end thereof penetrates through the mounting groove and is connected to the first support frame;

[0015] The middle second wheel-holding component also includes a second propulsion cylinder; the shell of the second propulsion cylinder is arranged on the installation groove, and its working end passes through the installation groove and is connected to the second support frame.

[0016] Optionally, the first middle wheel-holding member further includes a first telescopic connecting member; one end of the first telescopic connecting member is a first fixed end, and is fixedly arranged on the mounting groove through the first telescopic end, and the other end is a first telescopic end, and is telescopically arranged relative to the first fixed end, and the first telescopic end is connected to the first support frame;

[0017] The middle second wheel-holding component also includes a second telescopic connecting member; one end of the second telescopic connecting member is a second fixed end, and is fixedly arranged on the mounting groove, while the other end is a second telescopic end, and is telescopically arranged relative to the second fixed end, and the second telescopic end is connected to the second support frame.

[0018] Optionally, the front wheel holding assembly includes a base plate, a front baffle, a telescopic cylinder, a rotating cylinder and a locking cylinder; the base plate is rotatably disposed on the open end of the mounting groove; the housing of the rotating cylinder is connected to the mounting groove, and its working end is connected to the base plate; the front baffle is rotatably disposed on the base plate; the housing of the telescopic cylinder is hinged to the base plate, and its working end is hinged to the front baffle; the housing of the locking cylinder is connected to the mounting groove, and its working end is connected to the base plate.

[0019] Optionally, the rear wheel holding assembly includes a slide rail, a rear baffle, an auxiliary baffle, a third thrust cylinder and a fourth thrust cylinder; the slide rail is arranged in the closed end of the mounting groove along the length direction of the mounting groove; the rear baffle is arranged in the closed end of the mounting groove, and a slide groove adapted to the slide rail is arranged on the rear baffle; the shell of the third thrust cylinder is fixedly connected to the closed end of the mounting groove, and the working end is connected to the rear baffle; the auxiliary baffle is arranged above the rear baffle, and can be rotatably arranged on the closed end of the mounting groove; the shell of the fourth thrust cylinder is fixedly connected to the closed end of the mounting groove, and the working end is hinged to the auxiliary baffle.

[0020] In a second aspect, the present invention provides an aircraft tractor including the dual-axle dual-wheel wheel-holding mechanism, which further includes a tractor trolley; a mounting port connected to the rear end of the vehicle body is provided on the tractor trolley; the dual-axle dual-wheel wheel-holding mechanism is provided on the mounting port;

[0021] It also includes a full-vector travel unit and a lifting drive assembly; the number of the full-vector travel units is multiple, and they are evenly arranged in pairs at the bottom of the traction trolley through connecting shafts; the number of the lifting drive assemblies is at least two groups, and they are symmetrically arranged on both sides of the bottom of the traction trolley; each group of the lifting drive assemblies includes a first connecting rod, a second connecting rod and a lifting cylinder; one end of the first connecting rod is hinged to the connecting shaft through a first connecting seat, and the other end is hinged to one end of the second connecting rod; the end of the second connecting rod away from the first connecting rod is hinged to the bottom of the traction trolley through the second connecting seat; the shell of the lifting cylinder is connected to the first connecting seat, and the working end is connected to the second connecting seat;

[0022] It also includes a cab arranged on the tractor; the top of the cab is flush with the top of the tractor, and the bottom of the cab is flush with the bottom of the tractor;

[0023] It also includes a remote control and a control room arranged on the traction trolley; a hydraulic control system, a steering adjustment system and a signal receiver are arranged in the control room; the first upper shoe support cylinder, the first lower shoe support cylinder, the second upper shoe support cylinder, the second lower shoe support cylinder, the third upper shoe support cylinder, the third lower shoe support cylinder, the fourth upper shoe support cylinder, the fourth lower shoe support cylinder, the first propulsion cylinder, the second propulsion cylinder, the third propulsion cylinder, the fourth propulsion cylinder, the telescopic cylinder, the rotating cylinder, the locking cylinder and the lifting cylinder are all connected to the controller; each of the full vector form driving units is connected to the steering adjustment system; the hydraulic control system and the steering adjustment system are both connected to the signal receiver; the signal receiver is wirelessly connected to the remote control;

[0024] It also includes a ventilation port which is arranged on the traction trolley and communicated with the control room.

[0025] In a third aspect, the present invention provides a towing method using the aircraft towing vehicle, comprising:

[0026] Step S1, the operator drives the tractor trolley close to the aircraft double-axle double-wheel wheelset, and uses the remote controller to send a signal to lower the tractor trolley, which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the lifting cylinder to link the tractor trolley to lower for subsequent wheel holding operation; the operator uses the remote controller to send a signal to open the front wheel holding assembly, which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the rotating cylinder to link the bottom plate to open, and controls the telescopic cylinder to link the front baffle to open; at the same time, the operator uses the remote controller to send a reverse signal, which is transmitted to the steering adjustment system via the signal receiver, and the steering adjustment system controls the tractor trolley to reverse to the position of the aircraft double-axle double-wheel wheelset, and continues to reverse until the double-axle double-wheel wheelset abuts against the rear baffle, and then stops reversing;

[0027] Step S2, the operator uses the remote control to send a signal to retract and lock the front wheel-holding assembly, which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the rotating cylinder to link the bottom plate to retract, and controls the telescopic cylinder to link the front baffle to retract; then, the hydraulic control system controls the locking cylinder and the bottom plate to lock; if there is a gap between the double-axle double-wheel wheelset and the front baffle, the operator uses the remote control to send a signal to start the movement of the rear wheel-holding assembly, which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the third propulsion cylinder to link the rear baffle to move along the slide rail toward the front baffle until the double-axle double-wheel wheelset abuts against the front baffle, and controls the fourth propulsion cylinder to link the auxiliary baffle to abut against the double-axle double-wheel wheelset, so as to achieve the clamping operation of the double-axle double-wheel wheelset;

[0028] Step S3, the operator uses the remote controller to send a signal to start the operation of the middle wheel holding assembly, and the signal is transmitted to the hydraulic control system through the signal receiver, and the hydraulic control system controls the first propulsion cylinder and the second propulsion cylinder to respectively link the middle first wheel holding component and the middle second wheel holding component to move toward each other to the middle of the installation groove;

[0029] The hydraulic control system controls the first upper gripper cylinder to be linked to the first upper wheel-holding plate, controls the first lower gripper cylinder to be linked to the first lower wheel-holding plate, controls the third upper gripper cylinder to be linked to the third upper wheel-holding plate, and controls the third lower gripper cylinder to be linked to the third lower wheel-holding plate to be respectively moved closer to the front wheel-holding assembly to enclose a first wheel-holding space, so as to achieve the clamping of the double-wheel wheelset on one axle of the double-axle double-wheel wheelset;

[0030] The hydraulic control system controls the second upper gripper cylinder to be linked to the second upper wheel-holding plate, controls the second lower gripper cylinder to be linked to the second lower wheel-holding plate, controls the fourth upper gripper cylinder to be linked to the fourth upper wheel-holding plate, and controls the fourth lower gripper cylinder to be linked to the fourth lower wheel-holding plate to be respectively moved closer to the rear wheel-holding assembly to enclose a second wheel-holding space, thereby achieving the clamping of the double-wheel wheelset on the other axle of the double-axle double-wheel wheelset;

[0031] Step S4: The operator drives the towing vehicle to tow the aircraft toward the target location.

[0032] Optionally, the towing method further comprises in step S4 that after the towing trolley leaves the aircraft, an operator uses the remote controller to send a signal to raise the towing trolley, which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the lifting cylinder to link the towing trolley to raise, so as to avoid hitting obstacles during towing;

[0033] The towing method further includes step S5, wherein the step S5 includes using a corresponding number of the towing trolleys according to the number of the double-axle double-wheel wheelsets of the aircraft, and connecting adjacent towing trolleys via the connecting frame to achieve overall towing of the aircraft.

[0034] The application of the technical solution of the present invention has at least the following beneficial effects:

[0035] (1) The present invention provides a dual-axle dual-wheel wheel-holding mechanism, wherein a first wheel-holding space is formed by a first middle wheel-holding component and a third middle wheel-holding component being arranged opposite to a front wheel-holding assembly; a second wheel-holding space is formed by a second middle wheel-holding component and a fourth middle wheel-holding component being arranged opposite to a rear wheel-holding assembly; the first wheel-holding space and the second wheel-holding space are used to realize the clamping operation of the dual-axle dual-wheel wheel pair, thereby solving the problem that the existing wheel-holding mechanism cannot clamp the dual-axle dual-wheel structure of a heavy aircraft.

[0036] (2) The present invention provides an aircraft tractor including the dual-axle dual-wheel holding mechanism, which solves the problem that the existing holding mechanism cannot hold and tow the dual-axle dual-wheel structure of a heavy aircraft.

[0037] (3) The present invention provides a towing method for an aircraft tractor, which can realize automatic wheel holding by combining a remote control, a signal receiver, a hydraulic control system and a steering adjustment system during wheel holding operation. The towing method can meet the requirements of holding operations for dual-axle dual-wheel wheelsets of different sizes. Specifically, according to the size of the gap between the dual-axle dual-wheel wheelset and the front baffle, the hydraulic control system is used to control the third propulsion cylinder to link the rear baffle to move along the slide rail toward the front baffle until the dual-axle dual-wheel wheelset abuts the front baffle, and the fourth propulsion cylinder is controlled to link the auxiliary baffle to abut the dual-axle dual-wheel wheelset, so as to realize the holding operation for dual-axle dual-wheel wheelsets of different sizes. The towing method can also realize the overall towing of an aircraft. Specifically, according to the number of dual-axle dual-wheel wheelsets of the aircraft, a corresponding number of the towing trolleys are used, and adjacent towing trolleys are connected by the connecting frame to realize the overall towing of the aircraft.

[0038] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0040] Figure 1 2 is a schematic structural diagram of a double-axle double-wheel holding mechanism in an embodiment;

[0041] Figure 2 It is a structural schematic diagram of an aircraft tractor including the dual-axle dual-wheel holding mechanism in an embodiment;

[0042] Among them, 1. Mounting slot, 2. Front wheel holding assembly, 2.1. Bottom plate, 2.2. Front baffle, 2.3. Telescopic cylinder, 2.4. Rotating cylinder, 2.5. Locking cylinder, 3. Middle wheel holding assembly, 3.1. Middle first wheel holding member, 3.1.1. Middle first wheel holding member, 3.1.1.1. First upper support shoe cylinder, 3.1.1.2. First upper wheel holding piece, 3.1.1.3. First lower support shoe cylinder, 3.1.1.4. First lower wheel holding piece 3.1.2. Middle second wheel holding member, 3.1.3. First support frame, 3.1.4. First propulsion cylinder, 3.1.5. First Telescopic connection, 3.2, second middle wheel-holding component, 3.2.1, third middle wheel-holding component, 3.2.2, fourth middle wheel-holding component, 3.2.3, second support frame, 3.2.4, second propulsion cylinder, 3.2.5, second telescopic connection, 4, rear wheel-holding assembly, 4.1, slide rail, 4.2, rear baffle, 4.3, auxiliary baffle, 4.4, third propulsion cylinder, 4.5, fourth propulsion cylinder, 5, traction trolley, 5.1, installation port, 5.2, full vector driving unit, 5.3, lifting drive assembly, 5.4, cab, 5.5, control room, 5.6, ventilation port. DETAILED DESCRIPTION

[0043] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0044] Example:

[0045] See also Figure 1 A double-axle double-wheel wheel-holding mechanism comprises a mounting groove 1, a front wheel-holding assembly 2, a middle wheel-holding assembly 3 and a rear wheel-holding assembly 4;

[0046] One end of the installation slot 1 in the length direction is an open end, and the other end is a closed end;

[0047] The front wheel-holding assembly 2 can be opened and closed on the open end of the mounting groove 1; the rear wheel-holding assembly 4 can be slidably arranged in the closed end of the mounting groove 1, and can be arranged close to or far away from the front wheel-holding assembly 2;

[0048] The middle wheel-holding assembly 3 includes a middle first wheel-holding component 3.1 and a middle second wheel-holding component 3.2; the middle first wheel-holding component 3.1 and the middle second wheel-holding component 3.2 are respectively slidably arranged close to or slidably away from each other in the width direction of the mounting groove 1; the middle first wheel-holding component 3.1 includes a middle first wheel-holding part 3.1.1 and a middle second wheel-holding part 3.1.2; the middle second wheel-holding component 3.2 includes a middle third wheel-holding part 3.2.1 and a middle fourth wheel-holding part 3.2.2; the middle first wheel-holding part 3.1.1 and the middle third wheel-holding part 3.2.1 are arranged opposite to each other with the front wheel-holding assembly 2 to form a first wheel-holding space; the middle second wheel-holding part 3.1.2 and the middle fourth wheel-holding part 3.2.2 are arranged opposite to each other with the rear wheel-holding assembly 4 to form a second wheel-holding space.

[0049] The first middle wheel-holding component 3.1 also includes a first support frame 3.1.3 slidably arranged in the mounting groove 1; the first middle wheel-holding component 3.1.1 includes a first upper support shoe cylinder 3.1.1.1, a first upper wheel-holding piece 3.1.1.2, a first lower support shoe cylinder 3.1.1.3 and a first lower wheel-holding piece 3.1.1.4; the first upper wheel-holding piece 3.1.1.2 is arranged above the first lower wheel-holding piece 3.1.1.4; the first upper support shoe cylinder 3.1.1.1 and the first lower support shoe cylinder 3.1.1.3 are respectively arranged on the first support frame 3.1.3 from top to bottom; the first upper wheel-holding piece 3.1.1.2 is connected to the working end of the first upper support shoe cylinder 3.1.1.1; the first lower wheel-holding piece 3.1.1.4 is connected to the working end of the first lower support shoe cylinder 3.1.1.3;

[0050] The second middle wheel-holding component 3.2 also includes a second support frame 3.2.3 slidably arranged in the mounting groove 1; the third middle wheel-holding component 3.2.1 includes a third upper shoe cylinder, a third upper wheel-holding piece, a third lower shoe cylinder and a third lower wheel-holding piece; the third upper wheel-holding piece is arranged above the third lower wheel-holding piece; the third upper shoe cylinder and the third lower shoe cylinder are respectively arranged on the second support frame 3.2.3 from top to bottom; the third upper wheel cylinder is connected to the working end of the third upper shoe cylinder; the third lower wheel cylinder is connected to the working end of the third lower shoe cylinder;

[0051] The first upper wheel-holding piece 3.1.1.2, the first lower wheel-holding piece 3.1.1.4, the third upper wheel-holding piece and the third lower wheel-holding piece are arranged facing the front wheel-holding assembly 2 to enclose a first wheel-holding space.

[0052] The second wheel-holding component 3.1.2 in the middle includes a second upper shoe cylinder, a second upper wheel-holding plate, a second lower shoe cylinder and a second lower wheel-holding plate; the second upper wheel-holding plate is arranged above the second lower wheel-holding plate; the second upper shoe cylinder and the second lower shoe cylinder are respectively arranged on the first support frame 3.1.3 from top to bottom; the second upper wheel-holding plate is connected to the working end of the second upper shoe cylinder; the second lower wheel-holding plate is connected to the working end of the second lower shoe cylinder;

[0053] The fourth middle wheel holding component 3.2.2 includes a fourth upper shoe holding cylinder, a fourth upper wheel holding plate, a fourth lower shoe holding cylinder and a fourth lower wheel holding plate; the fourth upper wheel holding plate is arranged above the fourth lower wheel holding plate; the fourth upper shoe holding cylinder and the fourth lower shoe holding cylinder are respectively arranged on the second support frame 3.2.3 from top to bottom; the fourth upper wheel holding plate is connected to the working end of the fourth upper shoe holding cylinder; the fourth lower wheel holding plate is connected to the working end of the fourth lower shoe holding cylinder;

[0054] The second upper wheel-holding plate, the second lower wheel-holding plate, the fourth upper wheel-holding plate and the fourth lower wheel-holding plate are arranged facing the rear wheel-holding assembly 4 to enclose a second wheel-holding space.

[0055] The first middle wheel-holding member 3.1 also includes two first propulsion cylinders 3.1.4; the housing of the first propulsion cylinder 3.1.4 is arranged on the mounting groove 1, and the operating end thereof penetrates the mounting groove 1 and is connected to the first support frame 3.1.3;

[0056] The middle second wheel-holding component 3.2 also includes a second propulsion cylinder 3.2.4 (two in number); the shell of the second propulsion cylinder 3.2.4 is arranged on the mounting groove 1, and its working end passes through the mounting groove 1 and is connected to the second support frame 3.2.3.

[0057] The first middle wheel-holding member 3.1 also includes a first telescopic connection member 3.1.5 (two in number); one end of the first telescopic connection member 3.1.5 is a first fixed end, and is fixedly arranged on the mounting groove 1, and the other end is a first telescopic end, and is telescopically arranged relative to the first fixed end, and the first telescopic end is connected to the first support frame 3.1.3; specifically, the first telescopic connection member 3.1.5 is a telescopic sleeve structure, which is convenient for auxiliary support of the first support frame 3.1.3;

[0058] The second middle wheel-holding member 3.2 also includes a second telescopic connector 3.2.5 (two in number); one end of the second telescopic connector 3.2.5 is a second fixed end, and is fixedly arranged on the mounting slot 1, while the other end is a second telescopic end, and is telescopically arranged relative to the second fixed end, and the second telescopic end is connected to the second support frame 3.2.3. Specifically, the second telescopic connector 3.2.5 is a telescopic sleeve structure, which is convenient for auxiliary support of the second support frame 3.2.3.

[0059] The front wheel-holding assembly 2 includes a base plate 2.1, a front baffle 2.2, a telescopic cylinder 2.3, a rotating cylinder 2.4 and a locking cylinder 2.5; the base plate 2.1 is rotatably arranged on the open end of the mounting groove 1; the shell of the rotating cylinder 2.4 is connected to the mounting groove 1, and its working end is connected to the base plate 2.1; the front baffle 2.2 is rotatably arranged on the base plate 2.1; the shell of the telescopic cylinder 2.3 is hinged to the base plate 2.1, and its working end is hinged to the front baffle 2.2; the shell of the locking cylinder 2.5 is connected to the mounting groove 1, and its working end is connected to the base plate 2.1.

[0060] The rear wheel holding assembly 4 includes a slide rail 4.1, a rear baffle 4.2, an auxiliary baffle 4.3, a third thrust cylinder 4.4 and a fourth thrust cylinder 4.5; the slide rail 4.1 is arranged in the closed end of the mounting groove 1 along the length direction of the mounting groove 1; the rear baffle 4.2 is arranged in the closed end of the mounting groove 1, and a slide groove adapted to the slide rail 4.1 is arranged on the rear baffle 4.2; the shell of the third thrust cylinder 4.4 is fixedly connected to the closed end of the mounting groove 1, and the working end is connected to the rear baffle 4.2; the auxiliary baffle 4.3 is arranged above the rear baffle 4.2, and can be rotatably arranged on the closed end of the mounting groove 1; the shell of the fourth thrust cylinder 4.5 is fixedly connected to the closed end of the mounting groove 1, and the working end is hinged to the auxiliary baffle 4.3.

[0061] Specifically, two rear wheel-holding grooves adapted to the double-axle double-wheel wheelset are provided on the rear baffle 4.2, and the two rear wheel-holding grooves are separated by a protrusion provided on the rear baffle 4.2, and the protrusion is used to provide abutment support for the two adjacent side surfaces of the double-axle double-wheel wheelset to ensure the clamping support effect on the wheelset. There are two third propulsion cylinders 4.4, which are arranged in a one-to-one correspondence with the two rear wheel-holding grooves; the rear wheel-holding grooves are arc-shaped wheel-holding grooves, which improve the fit and clamping effect on the wheelset. There are two auxiliary baffles 4.3, which are arranged in a one-to-one correspondence above the two rear wheel-holding grooves; specifically, the two auxiliary baffles 4.3 are rotatably arranged on the closed end of the mounting groove 1 through a first rotating shaft; there are two fourth propulsion cylinders 4.5, which are arranged in a one-to-one correspondence with the two auxiliary baffles 4.3.

[0062] Specifically, there are two front baffles 2.2, which are arranged one-to-one with the two rear wheel-holding grooves; the two front baffles 2.2 are rotatably arranged on the bottom plate 2.1 through a second rotating shaft. There are two telescopic oil cylinders 2.3, which are arranged one-to-one with the two front baffles 2.2.

[0063] See also Figure 2 , an aircraft tractor including the double-axle double-wheel wheel-holding mechanism, further comprising a tractor 5; a mounting opening 5.1 communicating with the rear end of the vehicle body is arranged on the tractor 5; the double-axle double-wheel wheel-holding mechanism is arranged on the mounting opening 5.1;

[0064] It also includes a full-vector running unit 5.2 (specifically an omnidirectional steering wheel) and a lifting drive assembly 5.3; the number of the full-vector running units 5.2 is 16, and 4 pairs are formed by connecting shafts and are evenly arranged at the bottom of the traction trolley 5, wherein each pair of full-vector running units 5.2 has 4 full-vector running units 5.2; the number of the lifting drive assemblies 5.3 is 8 groups, and they are symmetrically arranged on both sides of the bottom of the traction trolley 5; each group of the lifting drive assemblies 5.3 includes a first connecting rod, a second connecting rod and a lifting cylinder; one end of the first connecting rod is hinged to the connecting shaft through a first connecting seat, and the other end is hinged to one end of the second connecting rod; the end of the second connecting rod away from the first connecting rod is hinged to the bottom of the traction trolley 5 through the second connecting seat; the shell of the lifting cylinder is connected to the first connecting seat, and the working end is connected to the second connecting seat;

[0065] It also includes a cab 5.4 arranged on the tractor 5; the top of the cab 5.4 is flush with the top of the tractor 5, and the bottom of the cab 5.4 is flush with the bottom of the tractor 5, ensuring that the entire vehicle body will not be affected by the height of the cab 5.4 when it is raised or lowered, thereby hindering the lifting of the entire vehicle body;

[0066] It also includes a remote controller (not shown in the figure) and a control room 5.5 arranged on the traction trolley 5; a hydraulic control system (not shown in the figure), a steering adjustment system (not shown in the figure) and a signal receiver (not shown in the figure) are arranged in the control room 5.5; the first upper shoe support cylinder 3.1.1.1, the first lower shoe support cylinder 3.1.1.3, the second upper shoe support cylinder, the second lower shoe support cylinder, the third upper shoe support cylinder, the third lower shoe support cylinder, the fourth upper shoe support cylinder, the fourth lower shoe support cylinder, the first propulsion cylinder 3.1.4, the second propulsion cylinder 3.2.4, the third propulsion cylinder 4.4, the fourth propulsion cylinder 4.5, the telescopic cylinder 2.3, the rotating cylinder 2.4, the locking cylinder 2.5 and the lifting cylinder are all connected to the controller; each of the full vector driving units 5.2 is connected to the steering adjustment system; the hydraulic control system and the steering adjustment system are connected to the signal receiver; the signal receiver is wirelessly connected to the remote controller;

[0067] It also includes a vent 5.6 disposed on the traction trolley 5 and connected to the control room 5.5 to facilitate ventilation and heat dissipation.

[0068] A towing method using the aircraft towing vehicle comprises:

[0069] Step S1, the operator drives the traction trolley 5 close to the double-axle double-wheel wheelset of the aircraft so that the central axis of the traction trolley 5 and the central axis of the double-axle double-wheel wheelset are kept in a straight line as much as possible, and uses the remote controller to send a signal to lower the traction trolley 5, which is transmitted to the hydraulic control system through the signal receiver, and the hydraulic control system controls the lifting cylinder to link the traction trolley 5 to lower for subsequent wheel holding operation; the operator uses the remote controller to send a signal to open the front wheel holding assembly 2, which is transmitted to the hydraulic control system through the signal receiver, and the hydraulic control system controls the rotating cylinder 2.4 to link the bottom plate 2.1 to open, and controls the telescopic cylinder 2.3 to link the front baffle 2.2 to open; at the same time, the operator uses the remote controller to send a reversing signal, which is transmitted to the steering adjustment system through the signal receiver, and the steering adjustment system controls the traction trolley 5 to reverse to the position of the double-axle double-wheel wheelset of the aircraft, and continues to reverse until the double-axle double-wheel wheelset abuts against the rear baffle 4.2, and then stops reversing;

[0070] Step S2, the operator uses the remote control to send a signal to retract and lock the front wheel holding assembly 2, which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the rotating cylinder 2.4 to link the bottom plate 2.1 to retract, and controls the telescopic cylinder 2.3 to link the front baffle 2.2 to retract; then, the hydraulic control system controls the locking cylinder 2.5 to lock the bottom plate 2.1; if there is a gap between the double-axle double-wheel wheelset and the front baffle 2.2, the operator uses the remote control to send a signal to start the movement operation of the rear wheel holding assembly 4, which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the third propulsion cylinder 4.4 to link the rear baffle 4.2 to move along the slide rail 4.1 toward the front baffle 2.2 until the double-axle double-wheel wheelset abuts against the front baffle 2.2, and controls the fourth propulsion cylinder 4.5 to link the auxiliary baffle 4.3 to abut against the double-axle double-wheel wheelset, so as to achieve the clamping operation of the double-axle double-wheel wheelset;

[0071] Step S3, the operator uses the remote controller to send a signal to start the operation of the middle wheel holding assembly 3, which is transmitted to the hydraulic control system through the signal receiver, and the hydraulic control system controls the first propulsion cylinder 3.1.4 and the second propulsion cylinder 3.2.4 to respectively link the middle first wheel holding component 3.1 and the middle second wheel holding component 3.2 to move toward each other to the middle of the installation groove 1;

[0072] The hydraulic control system controls the first upper support shoe cylinder 3.1.1.1 to be linked to the first upper wheel holding piece 3.1.1.2, controls the first lower support shoe cylinder 3.1.1.3 to be linked to the first lower wheel holding piece 3.1.1.4, controls the third upper support shoe cylinder to be linked to the third upper wheel holding piece, and controls the third lower support shoe cylinder to be linked to the third lower wheel holding piece to be respectively close to the front wheel holding assembly 2 to enclose a first wheel holding space, so as to achieve the clamping of the double-wheel wheelset on one axle of the double-axle double-wheel wheelset;

[0073] The hydraulic control system controls the second upper gripper cylinder to be linked to the second upper wheel-holding plate, controls the second lower gripper cylinder to be linked to the second lower wheel-holding plate, controls the fourth upper gripper cylinder to be linked to the fourth upper wheel-holding plate, and controls the fourth lower gripper cylinder to be linked to the fourth lower wheel-holding plate to be respectively close to the rear wheel-holding assembly 4 to enclose a second wheel-holding space, so as to achieve the clamping of the double-wheel wheelset on the other axle of the double-axle double-wheel wheelset;

[0074] Step S4: The operator drives the traction vehicle 5 to tow the aircraft to the target location.

[0075] The towing method further comprises in step S4 that after the towing trolley 5 leaves the aircraft, the operator uses the remote controller to send a signal to raise the towing trolley 5, which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the lifting cylinder to link the towing trolley 5 to raise, so as to avoid hitting obstacles during towing;

[0076] The towing method also includes step S5, which includes using a corresponding number of the towing trolleys 5 according to the number of the double-axle double-wheel wheelsets of the aircraft, and connecting adjacent towing trolleys 5 through the connecting frame (not shown in the figure) to achieve overall towing of the aircraft.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-axle double-wheel holding mechanism, characterized in that: It comprises a mounting groove (1), a front wheel holding assembly (2), a middle wheel holding assembly (3) and a rear wheel holding assembly (4); One end of the installation groove (1) in the length direction is an open end, and the other end is a closed end; The front wheel-holding assembly (2) can be opened and closed on the open end of the mounting groove (1); the rear wheel-holding assembly (4) can be slidably arranged in the closed end of the mounting groove (1) and can be arranged close to or far from the front wheel-holding assembly (2); The middle wheel-holding assembly (3) comprises a first middle wheel-holding component (3.1) and a second middle wheel-holding component (3.2); the first middle wheel-holding component (3.1) and the second middle wheel-holding component (3.2) are respectively arranged to be slidable close to or slidable away from each other in the width direction of the installation groove (1); the first middle wheel-holding component (3.1) comprises a first middle wheel-holding part (3.1.1) and a second middle wheel-holding part (3.1.2); the second middle wheel-holding component (3.1.2) is arranged to be slidable close to or slidable away from each other in the width direction of the installation groove (1); the first middle wheel-holding component (3.1) comprises a first middle wheel-holding component (3.1.1) and a second middle wheel-holding component (3.1.2); the second middle wheel-holding component (3.1.2) is arranged to be slidable close to or slidable away from each other in the width direction of the installation groove (1); the first middle wheel-holding component (3.1) comprises a first middle wheel-holding part (3.1.1) and a second middle wheel-holding part (3.1.2); the second middle wheel-holding component (3.1.2) is arranged to be slidable close to or slidable away from each other in the width direction of the installation groove (1); the first middle wheel-holding component (3.1.1) comprises a first middle wheel-holding part (3.1.1) and a second middle wheel-holding part (3.1.2); the second middle wheel-holding component (3.1.2) is arranged to be slidable close to or slidably away from each other in the width direction of the installation groove (1); the first middle wheel-holding component (3.1.1) comprises a first middle wheel-holding part (3.1.1) and a second middle wheel-holding part (3. The wheel component (3.2) comprises a third middle wheel-holding component (3.2.1) and a fourth middle wheel-holding component (3.2.2); the first middle wheel-holding component (3.1.1) and the third middle wheel-holding component (3.2.1) are arranged opposite to the front wheel-holding assembly (2) to form a first wheel-holding space; the second middle wheel-holding component (3.1.2) and the fourth middle wheel-holding component (3.2.2) are arranged opposite to the rear wheel-holding assembly (4) to form a second wheel-holding space.

2. The double-axle double-wheel holding mechanism according to claim 1, characterized in that: The first middle wheel holding component (3.1) further comprises a first support frame (3.1.3) slidably arranged in the mounting groove (1); the first middle wheel holding component (3.1.1) comprises a first upper support shoe cylinder (3.1.1.1), a first upper wheel holding piece (3.1.1.2), a first lower support shoe cylinder (3.1.1.3) and a first lower wheel holding piece (3.1.1.4); the first upper wheel holding piece (3.1.1.2) is arranged above the first lower wheel holding piece (3.1.1.4); the first upper support shoe cylinder ( 3.1.1.1) and the first lower support shoe cylinder (3.1.1.3) are respectively arranged on the first support frame (3.1.3) up and down; the first upper wheel holding piece (3.1.1.2) and the first upper support shoe cylinder ( The first lower wheel holding piece (3.1.1.4) is connected to the operating end of the first lower support shoe cylinder (3.1.1.3); The second wheel-holding component (3.2) in the middle also includes a second support frame (3.2.3) slidably arranged in the installation groove (1); the third wheel-holding component (3.2.1) in the middle includes a third upper support shoe cylinder, a third upper wheel-holding plate, a third lower support shoe cylinder and a third lower wheel-holding plate; the third upper wheel-holding plate is arranged above the third lower wheel-holding plate; the third upper support shoe cylinder and the third lower support shoe cylinder are respectively arranged on the second support frame (3.2.3) from top to bottom; the third upper wheel-holding plate is connected to the working end of the third upper support shoe cylinder; the third lower wheel-holding plate is connected to the working end of the third lower support shoe cylinder; The first upper wheel-holding plate (3.1.1.2), the first lower wheel-holding plate (3.1.1.4), the third upper wheel-holding plate and the third lower wheel-holding plate are arranged facing the front wheel-holding assembly (2) to enclose a first wheel-holding space.

3. The double-axle double-wheel holding mechanism according to claim 2, characterized in that: The second wheel-holding component (3.1.2) in the middle includes a second upper shoe-holding cylinder, a second upper wheel-holding plate, a second lower shoe-holding cylinder and a second lower wheel-holding plate; the second upper wheel-holding plate is arranged above the second lower wheel-holding plate; the second upper shoe-holding cylinder and the second lower shoe-holding cylinder are respectively arranged on the first support frame (3.1.3) from top to bottom; the second upper wheel-holding plate is connected to the operating end of the second upper shoe-holding cylinder; the second lower wheel-holding plate is connected to the operating end of the second lower shoe-holding cylinder; The fourth wheel-holding component (3.2.2) in the middle part comprises a fourth upper shoe-holding cylinder, a fourth upper wheel-holding plate, a fourth lower shoe-holding cylinder and a fourth lower wheel-holding plate; the fourth upper wheel-holding plate is arranged above the fourth lower wheel-holding plate; the fourth upper shoe-holding cylinder and the fourth lower shoe-holding cylinder are respectively arranged on the second support frame (3.2.3) from top to bottom; the fourth upper wheel-holding plate is connected to the operating end of the fourth upper shoe-holding cylinder; the fourth lower wheel-holding plate is connected to the operating end of the fourth lower shoe-holding cylinder; The second upper wheel-holding plate, the second lower wheel-holding plate, the fourth upper wheel-holding plate and the fourth lower wheel-holding plate are arranged facing each other with the rear wheel-holding assembly (4) to enclose a second wheel-holding space.

4. The double-axle double-wheel holding mechanism according to claim 3 is characterized in that: The first middle wheel-holding component (3.1) further comprises a first propulsion cylinder (3.1.4); the shell of the first propulsion cylinder (3.1.4) is arranged on the installation groove (1), and the operating end thereof is arranged through the installation groove (1) and is connected to the first support frame (3.1.3); The middle second wheel-holding component (3.2) also includes a second propulsion cylinder (3.2.4); the shell of the second propulsion cylinder (3.2.4) is arranged on the installation groove (1), and its operating end is arranged through the installation groove (1) and is connected to the second support frame (3.2.3).

5. The double-axle double-wheel holding mechanism according to claim 4, characterized in that: The first middle wheel-holding component (3.1) further comprises a first telescopic connecting member (3.1.5); one end of the first telescopic connecting member (3.1.5) is a first fixed end and is fixedly arranged on the mounting groove (1), while the other end is a first telescopic end and is telescopically arranged relative to the first fixed end, and the first telescopic end is connected to the first support frame (3.1.3); The middle second wheel-holding component (3.2) also includes a second telescopic connecting member (3.2.5); one end of the second telescopic connecting member (3.2.5) is a second fixed end and is fixedly arranged on the installation groove (1), while the other end is a second telescopic end and is telescopically arranged relative to the second fixed end, and the second telescopic end is connected to the second support frame (3.2.3).

6. The double-axle double-wheel holding mechanism according to claim 5, characterized in that: The front wheel holding assembly (2) comprises a base plate (2.1), a front baffle (2.2), a telescopic cylinder (2.3), a rotating cylinder (2.4) and a locking cylinder (2.5); the base plate (2.1) is rotatably arranged on the open end of the mounting groove (1); the housing of the rotating cylinder (2.4) is connected to the mounting groove (1), and its operating end is connected to the base plate (2.1); the front baffle (2.2) is rotatably arranged on the base plate (2.1); the housing of the telescopic cylinder (2.3) is hinged to the base plate (2.1), and its operating end is hinged to the front baffle (2.2); the housing of the locking cylinder (2.5) is connected to the mounting groove (1), and its operating end is connected to the base plate (2.1).

7. The double-axle double-wheel holding mechanism according to claim 6, characterized in that: The rear wheel holding assembly (4) comprises a slide rail (4.1), a rear baffle (4.2), an auxiliary baffle (4.3), a third thrust cylinder (4.4) and a fourth thrust cylinder (4.5); the slide rail (4.1) is arranged in the closed end of the mounting groove (1) along the length direction of the mounting groove (1); the rear baffle (4.2) is arranged in the closed end of the mounting groove (1), and a slide groove matching the slide rail (4.1) is arranged on the rear baffle (4.2); the shell of the third thrust cylinder (4.4) is fixedly connected to the closed end of the mounting groove (1), and the working end is connected to the rear baffle (4.2); the auxiliary baffle (4.3) is arranged above the rear baffle (4.2) and can be rotatably arranged on the closed end of the mounting groove (1); the shell of the fourth thrust cylinder (4.5) is fixedly connected to the closed end of the mounting groove (1), and the working end is hinged to the auxiliary baffle (4.3).

8. An aircraft tractor comprising the dual-axle dual-wheel holding mechanism as claimed in claim 7, characterized in that: It also includes a traction trolley (5); a mounting opening (5.1) communicating with the rear end of the vehicle body is provided on the traction trolley (5); the double-axle double-wheel holding mechanism is provided on the mounting opening (5.1); It also includes a full-vector travel unit (5.2) and a lifting drive assembly (5.3); the number of the full-vector travel units (5.2) is multiple, and they are evenly arranged in pairs at the bottom of the traction trolley (5) through connecting shafts; the number of the lifting drive assemblies (5.3) is at least two groups, and they are symmetrically arranged on both sides of the bottom of the traction trolley (5); each group of the lifting drive assemblies (5.3) includes a first connecting rod, a second connecting rod and a lifting cylinder; one end of the first connecting rod is hinged to the connecting shaft through a first connecting seat, and the other end is hinged to one end of the second connecting rod; the end of the second connecting rod away from the first connecting rod is hinged to the bottom of the traction trolley (5) through the second connecting seat; the shell of the lifting cylinder is connected to the first connecting seat, and the working end is connected to the second connecting seat; It also includes a cab (5.4) arranged on the tractor (5); the top of the cab (5.4) is flush with the top of the tractor (5), and the bottom of the cab (5.4) is flush with the bottom of the tractor (5); It also includes a remote controller and a control room (5.5) arranged on the traction trolley (5); a hydraulic control system, a steering adjustment system and a signal receiver are arranged in the control room (5.5); the first upper shoe support cylinder (3.1.1.1), the first lower shoe support cylinder (3.1.1.3), the second upper shoe support cylinder, the second lower shoe support cylinder, the third upper shoe support cylinder, the third lower shoe support cylinder, the fourth upper shoe support cylinder, the fourth lower shoe support cylinder, the first propulsion cylinder (3.1.4), the second propulsion cylinder (3.2.4), the third propulsion cylinder (4.4), the fourth propulsion cylinder (4.5), the telescopic cylinder (2.3), the rotating cylinder (2.4), the locking cylinder (2.5) and the lifting cylinder are all connected to the controller; each of the full vector driving units (5.2) is connected to the steering adjustment system; the hydraulic control system and the steering adjustment system are both connected to the signal receiver; the signal receiver is wirelessly connected to the remote controller; It also includes a ventilation port (5.6) which is arranged on the traction trolley (5) and is in communication with the control room (5.5).

9. A towing method using the aircraft towing vehicle according to claim 8, characterized in that: include: Step S1, the operator drives the tractor (5) close to the double-axle double-wheel wheel pair of the aircraft, and uses the remote controller to send a signal to lower the tractor (5), which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the lifting cylinder to link the tractor (5) to lower so as to facilitate the subsequent wheel holding operation; The operator uses the remote control to send a signal to open the front wheel assembly (2), which is transmitted to the hydraulic control system via the signal receiver. The hydraulic control system controls the rotating cylinder (2.4) to open the bottom plate (2.1) and controls the telescopic cylinder (2.3) to open the front baffle (2.2). At the same time, the operator uses the remote control to send a reverse signal, which is transmitted to the steering adjustment system via the signal receiver. The steering adjustment system controls the traction trolley (5) to reverse to the position of the double-axle double-wheel wheel pair of the aircraft and continue to reverse until the double-axle double-wheel wheel pair contacts the rear baffle (4.2) and stops reversing. Step S2, the operator uses the remote control to send a signal to retract and lock the front wheel holding assembly (2), which is transmitted to the hydraulic control system through the signal receiver. The hydraulic control system controls the rotating cylinder (2.4) to retract the base plate (2.1) and controls the telescopic cylinder (2.3) to retract the front baffle (2.2). Subsequently, the hydraulic control system controls the locking cylinder (2.5) to lock the base plate (2.1). If there is a gap between the double-axle double-wheel wheelset and the front baffle (2.2), the operator A person uses the remote controller to send a signal to start the movement of the rear wheel-holding assembly (4), which is transmitted to the hydraulic control system via the signal receiver. The hydraulic control system controls the third propulsion cylinder (4.4) to move the rear baffle (4.2) along the slide rail (4.1) toward the front baffle (2.2) until the double-axle double-wheel wheelset abuts against the front baffle (2.2), and controls the fourth propulsion cylinder (4.5) to move the auxiliary baffle (4.3) to abut against the double-axle double-wheel wheelset, thereby achieving the clamping operation of the double-axle double-wheel wheelset; Step S3, the operator uses the remote controller to send a signal to start the operation of the middle wheel holding assembly (3), which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the first propulsion cylinder (3.1.4) and the second propulsion cylinder (3.2.4) to respectively link the middle first wheel holding component (3.1) and the middle second wheel holding component (3.2) to move towards each other to the middle of the installation groove (1); The first upper shoe cylinder is controlled by the hydraulic control system ( 3.1.1.1) links the first upper wheel holding piece (3.1.1.2), controls the first lower support shoe cylinder (3.1.1.3) to link the first lower wheel holding piece (3.1.1.4), controls the third upper support shoe cylinder to link the third upper wheel holding piece, and controls the third lower support shoe cylinder to link the third lower wheel holding piece to move closer to the front wheel holding assembly (2) to enclose a first wheel holding space, thereby achieving the clamping of the two-wheel wheelset on one axle of the two-axle two-wheel wheelset; The hydraulic control system controls the second upper gripper cylinder to be linked to the second upper wheel-holding plate, controls the second lower gripper cylinder to be linked to the second lower wheel-holding plate, controls the fourth upper gripper cylinder to be linked to the fourth upper wheel-holding plate, and controls the fourth lower gripper cylinder to be linked to the fourth lower wheel-holding plate to move closer to the rear wheel-holding assembly (4) to enclose a second wheel-holding space, thereby achieving a tightening of the double-wheel wheelset on the other axle of the double-axle double-wheel wheelset; Step S4: The operator drives the traction vehicle (5) to tow the aircraft towards the target location.

10. The traction method according to claim 9, characterized in that: The traction method further comprises in step S4 that after the traction trolley (5) leaves the aircraft, the operator uses the remote controller to send a signal to raise the traction trolley (5), which is transmitted to the hydraulic control system via the signal receiver, and the hydraulic control system controls the lifting cylinder to link the traction trolley (5) to raise, so as to avoid hitting obstacles during traction; The towing method further comprises step S5, wherein the step S5 comprises using a corresponding number of the towing trolleys (5) according to the number of the double-axle double-wheel wheelsets of the aircraft, and connecting adjacent towing trolleys (5) via the connecting frame to achieve overall towing of the aircraft.

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