Double-shaft double-wheel wheel holding mechanism and aircraft tractor

Abstract

The utility model relates to the technical field of aircraft traction, in particular to a double-shaft double-wheel wheel holding mechanism and an aircraft tractor. According to the wheel holding mechanism, a wheel holding space is defined by a front wheel holding assembly, a mounting groove and a rear wheel holding assembly. The rear wheel holding assembly is slidably arranged in the closed end of the mounting groove and is close to or far away from the front wheel holding assembly, so that the size of the wheel holding space is adjustable, and the requirement for holding operation of double-shaft double-wheel aircraft wheel sets of different sizes is met. The aircraft tractor comprises the wheel holding mechanism, so that the holding traction operation of double-shaft double-wheel wheel pairs with different sizes can be realized, and the overall traction of an aircraft can also be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of aircraft traction, specifically relates to a double-shaft double-wheel wheel-holding mechanism and aircraft tractor. BACKGROUND

[0002] The wheel-holding mechanism cannot be separated from the use in the process of aircraft traction. The existing wheel-holding mechanism mostly takes single model aircraft wheel as the research object, and the wheel-holding space surrounded by the front wheel-holding assembly and the rear wheel-holding assembly is fixed in size, which cannot meet the wheel-holding and traction of more aircraft wheel groups of different sizes. In addition, the existing wheel-holding mechanism is mostly used for completing the wheel-holding and traction of single-shaft single-wheel aircraft, and less for completing the wheel-holding and traction of double-shaft double-wheel aircraft.

[0003] Therefore, it is necessary to provide a double-shaft double-wheel wheel-holding mechanism and aircraft tractor for meeting the wheel-holding and traction of double-shaft double-wheel aircraft wheel groups of different sizes. SUMMARY

[0004] The utility model aims at providing a double-shaft double-wheel wheel-holding mechanism and aircraft tractor, and the specific technical scheme is as follows:

[0005] In the first aspect, the utility model provides a double-shaft double-wheel wheel-holding mechanism, which comprises a mounting groove, a front wheel-holding assembly and a rear wheel-holding assembly.

[0006] One end of the mounting groove in the length direction is an open end, and the other end is a closed end.

[0007] The front wheel-holding assembly is arranged on the open end of the mounting groove in an openable and closable manner; the rear wheel-holding assembly is slidably arranged in the closed end of the mounting groove and is arranged close to or away from the front wheel-holding assembly; and a wheel-holding space is surrounded by the front wheel-holding assembly, the mounting groove and the rear wheel-holding assembly.

[0008] Optionally, the rear wheel-holding assembly comprises a sliding rail, a rear wheel-holding plate, a rear adjusting plate, a first propelling oil cylinder and a second propelling oil cylinder; the sliding rail is arranged in the closed end of the mounting groove along the length direction of the mounting groove; the rear wheel-holding plate is arranged in the closed end of the mounting groove, and a sliding groove matched with the sliding rail is arranged on the rear wheel-holding plate; the shell of the first propelling oil cylinder is fixedly connected with the closed end of the mounting groove, and the working end is connected with the rear wheel-holding plate; the rear adjusting plate is arranged above the rear wheel-holding plate and is rotatably arranged on the closed end of the mounting groove; and the shell of the second propelling oil cylinder is fixedly connected with the closed end of the mounting groove, and the working end is hingedly connected with the rear adjusting plate.

[0009] Optionally, two rear wheel embracing grooves adapted to the double-axle double-wheel wheel pair are arranged on the rear wheel embracing plate, and the two rear wheel embracing grooves are separated by a protrusion arranged on the rear wheel embracing plate; the number of the first propelling oil cylinders is two, and the two first propelling oil cylinders are arranged in one-to-one correspondence with the two rear wheel embracing grooves; the number of the rear adjusting plates is two, and the two rear adjusting plates are arranged in one-to-one correspondence above the two rear wheel embracing grooves; the number of the second propelling oil cylinders is two, and the two second propelling oil cylinders are arranged in one-to-one correspondence with the two rear adjusting plates.

[0010] Optionally, the rear wheel embracing assembly further comprises a first rotating shaft; the two rear adjusting plates are rotatably arranged on the closed end of the mounting groove through the first rotating shaft.

[0011] The rear wheel embracing groove is an arc-shaped wheel embracing groove.

[0012] Optionally, the front wheel embracing assembly comprises a front adjusting plate, a pressing plate, an extension oil cylinder, a rotating oil cylinder and a locking oil cylinder; the front adjusting plate is rotatably arranged on the open end of the mounting groove; the housing of the rotating oil cylinder is connected with the mounting groove, and the working end of the rotating oil cylinder is connected with the front adjusting plate; the pressing plate is rotatably arranged on the front adjusting plate; the housing of the extension oil cylinder is hingedly connected with the front adjusting plate, and the working end of the extension oil cylinder is hingedly connected with the pressing plate; the housing of the locking oil cylinder is connected with the mounting groove, and the working end of the locking oil cylinder is connected with the front adjusting plate.

[0013] Optionally, the number of the pressing plates is two, and the two pressing plates are arranged in one-to-one correspondence with the two rear wheel embracing grooves; the number of the extension oil cylinders is two, and the two extension oil cylinders are arranged in one-to-one correspondence with the two pressing plates.

[0014] Optionally, the front wheel embracing assembly further comprises a second rotating shaft; the two pressing plates are rotatably arranged on the front adjusting plate through the second rotating shaft.

[0015] In a second aspect, the utility model provides a kind of aircraft towing vehicle comprising the double-axle double-wheel wheel embracing mechanism of the described, which further comprises a towing trolley;Mounting port is arranged in communication with the tail end of vehicle body on the towing trolley;The double-axle double-wheel wheel embracing mechanism is arranged on the mounting port.

[0016] Optionally, the traction trolley further comprises full-vector form running units and lifting driving assemblies; the number of the full-vector form running units is multiple, and the full-vector form running units are evenly arranged in pairs on the bottom of the traction trolley through connecting shafts; the number of the lifting driving assemblies is at least two groups, and the lifting driving assemblies are symmetrically arranged on both sides of the bottom of the traction trolley; each group of the lifting driving assemblies comprises a first connecting rod, a second connecting rod and a lifting oil 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 a second connecting seat; the shell of the lifting oil cylinder is connected to the first connecting seat, and the working end is connected to the second connecting seat;

[0017] Further comprising a cab arranged on the traction trolley; the top of the cab is flush with the top of the traction trolley, and the bottom of the cab is flush with the bottom of the traction trolley;

[0018] Further comprising a remote controller and a control room arranged on the traction trolley; a hydraulic control system, a steering adjusting system and a signal receiver are arranged in the control room; the first propelling oil cylinder, the second propelling oil cylinder, the telescopic oil cylinder, the rotating oil cylinder, the locking oil cylinder and the lifting oil cylinder are connected to the controller; each full-vector form running unit is connected to the steering adjusting system; the hydraulic control system and the steering adjusting system are connected to the signal receiver; the signal receiver is wirelessly connected to the remote controller;

[0019] Further comprising a ventilation opening arranged on the traction trolley and communicating with the control room.

[0020] Optionally, the number of the traction trolleys is multiple, and the adjacent traction trolleys are connected through the connecting frames.

[0021] The technical scheme of the utility model has at least the following beneficial effects:

[0022] (1) The double-shaft double-wheel embracing wheel mechanism provided by the utility model comprises a front embracing wheel assembly, a mounting groove and a rear embracing wheel assembly, the rear embracing wheel assembly is slidably arranged in the closed end of the mounting groove, and is arranged close to or away from the front embracing wheel assembly, so that the size of the embracing wheel space can be adjusted to meet the embracing operation of aircraft wheel sets of different sizes.

[0023] (2) The utility model is provided with two rear embracing wheel grooves on the rear embracing wheel assembly, which are adapted to the double-shaft double-wheel wheel pair, two pressing plates are arranged on the front embracing wheel assembly, and the two pressing plates and the two rear embracing wheel grooves are arranged one by one in correspondence, so that the embracing operation of the double-shaft double-wheel aircraft wheel set can be met.

[0024] (3)The utility model provides a kind of airplane towing vehicle containing double axle double wheel embrace wheel mechanism, different size double axle double wheel wheelset can be realized to embrace and drag operation;Specifically, according to the gap size condition existing between double axle double wheel wheelset and the compression plate, the first push cylinder is linked to control the rear embrace wheel plate moves along the slide rail to the compression plate, to double axle double wheel wheelset and the compression plate abut, and the second push cylinder is linked to control the rear adjusting plate and double axle double wheel wheelset abut, realize the embrace operation of different size double axle double wheel wheelset.The airplane towing vehicle can also realize the overall traction of airplane;Specifically, according to the number of airplane double axle double wheel wheelset, corresponding number of the towing trolley is used, and adjacent the towing trolley is connected by the connecting frame, to realize the overall traction of airplane.

[0025] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages.The utility model will be further explained in detail with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings that form part of the present application are intended to provide further understanding of the utility model, and the illustrative embodiments of the utility model and its explanation are used to explain the utility model, and do not constitute undue limitation on the utility model.In the drawings:

[0027] Figure 1 It is the structure schematic view of a kind of double axle double wheel embrace wheel mechanism in embodiment;

[0028] Figure 2 It is the structure schematic view of a kind of airplane towing vehicle containing double axle double wheel embrace wheel mechanism in embodiment;

[0029] Wherein, 1, installation slot, 2, front embrace wheel component, 2.1, front adjusting plate, 2.2, compression plate, 2.3, telescopic cylinder, 2.4, rotating cylinder, 2.5, locking cylinder, 3, rear embrace wheel component, 3.1, slide rail, 3.2, rear embrace wheel plate, 3.2.1, rear embrace wheel groove, 3.2.2, protrusion, 3.3, rear adjusting plate, 3.4, first push cylinder, 3.5, second push cylinder, 4, towing trolley, 4.1, full-vector form travel unit, 4.2, lifting drive assembly, 4.3, cab, 4.4, control room, 4.5, air vent. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art belong to the scope of protection of the utility model.

[0031] Embodiment:

[0032] Referring to Figure 1 A double-shaft double-wheel embracing wheel mechanism comprises a mounting groove 1, a front embracing wheel assembly 2 and a rear embracing wheel assembly 3.

[0033] One end of the mounting groove 1 in the length direction is an open end, and the other end is a closed end.

[0034] The front embracing wheel assembly 2 is arranged on the open end of the mounting groove 1 in an openable and closable manner; the rear embracing wheel assembly 3 is slidably arranged in the closed end of the mounting groove 1 and is arranged close to or away from the front embracing wheel assembly 2; the front embracing wheel assembly 2, the mounting groove 1 and the rear embracing wheel assembly 3 form an embracing wheel space.

[0035] The rear embracing wheel assembly 3 comprises a sliding rail 3.1, a rear embracing wheel plate 3.2, a rear adjusting plate 3.3, a first propelling oil cylinder 3.4 and a second propelling oil cylinder 3.5; the sliding rail 3.1 is arranged in the closed end of the mounting groove 1 along the length direction of the mounting groove 1; the rear embracing wheel plate 3.2 is arranged in the closed end of the mounting groove 1, and a sliding groove matched with the sliding rail 3.1 is arranged on the rear embracing wheel plate 3.2; the shell of the first propelling oil cylinder 3.4 is fixedly connected with the closed end of the mounting groove 1, and the working end is connected with the rear embracing wheel plate 3.2; the rear adjusting plate 3.3 is arranged above the rear embracing wheel plate 3.2 and is rotatably arranged on the closed end of the mounting groove 1; the shell of the second propelling oil cylinder 3.5 is fixedly connected with the closed end of the mounting groove 1, and the working end is hingedly connected with the rear adjusting plate 3.3.

[0036] Two rear embracing wheel grooves 3.2.1 matched with the double-shaft double-wheel wheel pair are arranged on the rear embracing wheel plate 3.2, and the two rear embracing wheel grooves 3.2.1 are separated by a protrusion 3.2.2 arranged on the rear embracing wheel plate 3.2, the protrusion 3.2.2 provides abutting support for the adjacent two side surfaces of the double-shaft double-wheel wheel pair, so as to ensure the embracing support effect on the wheel pair; the number of the first propelling oil cylinder 3.4 is two, and the first propelling oil cylinder 3.4 is arranged in one-to-one correspondence with the two rear embracing wheel grooves 3.2.1; the number of the rear adjusting plate 3.3 is two, and the rear adjusting plate 3.3 is arranged above the two rear embracing wheel grooves 3.2.1 in one-to-one correspondence; the number of the second propelling oil cylinder 3.5 is two, and the second propelling oil cylinder 3.5 is arranged in one-to-one correspondence with the two rear adjusting plates 3.3.

[0037] The rear wheel embracing assembly 3 further comprises a first rotating shaft; two rear adjusting plates 3.3 are rotatably arranged on the closed end of the mounting groove 1 through the first rotating shaft;

[0038] The rear wheel embracing groove 3.2.1 is an arc-shaped wheel embracing groove, which improves the close embracing effect on the wheel set.

[0039] The front wheel embracing assembly 2 comprises a front adjusting plate 2.1, a pressing plate 2.2, an extension oil cylinder 2.3, a rotating oil cylinder 2.4 and a locking oil cylinder 2.5; the front adjusting plate 2.1 is rotatably arranged on the open end of the mounting groove 1; the shell of the rotating oil cylinder 2.4 is connected with the mounting groove 1, and the working end thereof is connected with the front adjusting plate 2.1; the pressing plate 2.2 is rotatably arranged on the front adjusting plate 2.1; the shell of the extension oil cylinder 2.3 is hingedly connected with the front adjusting plate 2.1, and the working end thereof is hingedly connected with the pressing plate 2.2; the shell of the locking oil cylinder 2.5 is connected with the mounting groove 1, and the working end thereof is connected with the front adjusting plate 2.1.

[0040] The number of the pressing plates 2.2 is two, and each of the pressing plates 2.2 is correspondingly arranged with the rear wheel embracing groove 3.2.1; the number of the extension oil cylinders 2.3 is two, and each of the extension oil cylinders 2.3 is correspondingly arranged with the pressing plate 2.2.

[0041] The front wheel embracing assembly 2 further comprises a second rotating shaft; the two pressing plates 2.2 are rotatably arranged on the front adjusting plate 2.1 through the second rotating shaft.

[0042] Referring to Figure 2 An aircraft towing vehicle comprising the double-axle double-wheel wheel embracing mechanism further comprises a towing trolley 4; a mounting opening is arranged on the towing trolley 4 and communicates with the tail end of the vehicle body; and the double-axle double-wheel wheel embracing mechanism is arranged on the mounting opening.

[0043] The towing trolley 4 further comprises full-vector form traveling units 4.1 (specifically, omni-directional steering wheels) and lifting driving assemblies 4.2; the number of the full-vector form traveling units 4.1 is 16, and the full-vector form traveling units 4.1 are evenly arranged in four pairs through connecting shafts on the bottom of the towing trolley 4, wherein each pair of the full-vector form traveling units 4.1 comprises four full-vector form traveling units 4.1; the number of the lifting driving assemblies 4.2 is 8, and the lifting driving assemblies 4.2 are symmetrically arranged on both sides of the bottom of the towing trolley 4; each of the lifting driving assemblies 4.2 comprises a first connecting rod, a second connecting rod and a lifting oil cylinder; one end of the first connecting rod is hingedly connected with the connecting shaft through a first connecting seat, and the other end thereof is hingedly connected with one end of the second connecting rod; the end of the second connecting rod away from the first connecting rod is hingedly connected with the bottom of the towing trolley 4 through a second connecting seat; the shell of the lifting oil cylinder is connected with the first connecting seat, and the working end thereof is connected with the second connecting seat;

[0044] The cab 4.3 is arranged on the traction trolley 4, the top of the cab 4.3 is flush with the top of the traction trolley 4, and the bottom of the cab 4.3 is flush with the bottom of the traction trolley 4, so that the height of the cab 4.3 does not affect the lifting of the whole vehicle body;

[0045] The remote controller (not shown in the figure) and the control room 4.4 arranged on the traction trolley 4 are further included; the hydraulic control system (not shown in the figure), the steering adjustment system (not shown in the figure) and the signal receiver (not shown in the figure) are arranged in the control room 4.4; the first propelling oil cylinder 3.4, the second propelling oil cylinder 3.5, the telescopic oil cylinder 2.3, the rotating oil cylinder 2.4, the locking oil cylinder 2.5 and the lifting oil cylinder are connected with the controller; each full-vector-form travel unit 4.1 is connected with the steering adjustment system; the hydraulic control system and the steering adjustment system are connected with the signal receiver; the signal receiver is wirelessly connected with the remote controller.

[0046] The air vent 4.5 arranged on the traction trolley 4 and communicating with the control room 4.4 is further included, so as to facilitate ventilation and heat dissipation.

[0047] The number of the traction trolleys 4 is plural, and the adjacent traction trolleys 4 are connected through the connecting frames.

[0048] The traction method of the aircraft tractor is as follows:

[0049] In step S1, the operator drives the traction trolley 4 to approach the double-axle double-wheel wheelset of the aircraft, and uses the remote controller to send a signal for lowering the traction trolley 4, which is transmitted to the hydraulic control system through the signal receiver, so that the traction trolley 4 is lowered through the linkage of the lifting oil cylinder controlled by the hydraulic control system, for subsequent wheel holding operation; the operator uses the remote controller to send a signal for opening the front wheel holding assembly 2, which is transmitted to the hydraulic control system through the signal receiver, so that the front adjusting plate 2.1 is opened through the linkage of the rotating oil cylinder 2.4 controlled by the hydraulic control system, and the telescopic oil cylinder 2.3 is controlled to open the pressing plate 2.2; at the same time, the operator uses the remote controller to send a reverse signal, which is transmitted to the steering adjustment system through the signal receiver, so that the traction trolley 4 is reversed 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 wheel holding plate 3.2, and then stops reversing.

[0050] Step S2, the operator sends a signal to retract the front wheel assembly 2 by using the remote controller, which is transmitted to the hydraulic control system through the signal receiver, and the hydraulic control system controls the rotation oil cylinder 2.4 to retract the front adjusting plate 2.1 and controls the telescopic oil cylinder 2.3 to retract the pressing plate 2.2; then, the hydraulic control system controls the locking oil cylinder 2.5 to lock the front adjusting plate 2.1; if there is a gap between the double-axle double-wheel wheel set and the pressing plate 2.2, the operator sends a signal to start the movement operation of the rear wheel assembly 3 by using the remote controller, which is transmitted to the hydraulic control system through the signal receiver, and the hydraulic control system controls the first propulsion oil cylinder 3.4 to drive the rear wheel plate 3.2 to move along the slide rail 3.1 to the pressing plate 2.2 until the double-axle double-wheel wheel set abuts against the pressing plate 2.2, and controls the second propulsion oil cylinder 3.5 to drive the rear adjusting plate 3.3 to abut against the double-axle double-wheel wheel set, thereby achieving the clamping operation of the double-axle double-wheel wheel set;

[0051] Step S3, the towing trolley 4 is controlled to tow the airplane to the target position.

[0052] The towing method further comprises the following step S3: after the towing trolley 4 leaves the airplane, the operator sends a signal to raise the towing trolley 4 by using the remote controller, which is transmitted to the hydraulic control system through the signal receiver, and the hydraulic control system controls the lifting oil cylinder to drive the towing trolley 4 to rise, thereby avoiding obstacles during towing.

[0053] The towing method further comprises the following step S5: according to the number of double-axle double-wheel wheel sets of the airplane, a corresponding number of towing trolleys 4 are used, and the adjacent towing trolleys 4 are connected through the connecting frame, thereby achieving the overall towing of the airplane.

[0054] The above only describes preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A double-shaft double-wheel holding mechanism characterized by comprising: The application relates to a front and rear wheel assembly for a wheel loader, which comprises a mounting groove (1), a front wheel assembly (2) and a rear wheel assembly (3). One end of the mounting groove (1) is an open end in the length direction, and the other end is a closed end. The front wheel assembly (2) is arranged on the open end of the mounting groove (1) in an openable and closable mode; the rear wheel assembly (3) is arranged in the closed end of the mounting groove (1) in a slidable mode and is arranged close to or away from the front wheel assembly (2); a wheel space is formed by the front wheel assembly (2), the mounting groove (1) and the rear wheel assembly (3).

2. The dual shaft dual wheel hugging mechanism according to claim 1, wherein, The rear wheel assembly (3) comprises a slide rail (3.1), a rear wheel plate (3.2), a rear adjusting plate (3.3), a first pushing oil cylinder (3.4) and a second pushing oil cylinder (3.5); the slide rail (3.1) is arranged in the closed end of the mounting groove (1) in the length direction of the mounting groove (1); the rear wheel plate (3.2) is arranged in the closed end of the mounting groove (1), a slide groove matched with the slide rail (3.1) is arranged on the rear wheel plate (3.2); the shell of the first pushing oil cylinder (3.4) is fixedly connected with the closed end of the mounting groove (1), and the working end is connected with the rear wheel plate (3.2); the rear adjusting plate (3.3) is arranged above the rear wheel plate (3.2) and is rotatably arranged on the closed end of the mounting groove (1); the shell of the second pushing oil cylinder (3.5) is fixedly connected with the closed end of the mounting groove (1), and the working end is hingedly connected with the rear adjusting plate (3.3).

3. The dual shaft dual wheel hugging mechanism according to claim 2, wherein, Two rear wheel grooves (3.2.1) matched with a double-shaft double-wheel wheel pair are arranged on the rear wheel plate (3.2), and the two rear wheel grooves (3.2.1) are separated by a protrusion (3.2.2) arranged on the rear wheel plate (3.2); the number of the first pushing oil cylinders (3.4) is two, and the first pushing oil cylinders (3.4) are arranged in one-to-one correspondence with the two rear wheel grooves (3.2.1); the number of the rear adjusting plates (3.3) is two, and the rear adjusting plates (3.3) are arranged in one-to-one correspondence above the two rear wheel grooves (3.2.1); the number of the second pushing oil cylinders (3.5) is two, and the second pushing oil cylinders (3.5) are arranged in one-to-one correspondence with the two rear adjusting plates (3.3).

4. The dual shaft dual wheel hugging mechanism according to claim 3, wherein, The rear wheel assembly (3) further comprises a first rotating shaft; the two rear adjusting plates (3.3) are rotatably arranged on the closed end of the mounting groove (1) through the first rotating shaft. The rear wheel grooves (3.2.1) are arc-shaped wheel grooves.

5. The dual shaft dual wheel hugging mechanism according to claim 3, wherein, The front embracing wheel assembly (2) comprises a front adjusting plate (2.1), a pressing plate (2.2), a telescopic oil cylinder (2.3), a rotating oil cylinder (2.4) and a locking oil cylinder (2.5); the front adjusting plate (2.1) is rotatably arranged at the opening end of the mounting groove (1); the shell of the rotating oil cylinder (2.4) is connected with the mounting groove (1), and the working end thereof is connected with the front adjusting plate (2.1); the pressing plate (2.2) is rotatably arranged on the front adjusting plate (2.1); the shell of the telescopic oil cylinder (2.3) is hingedly connected with the front adjusting plate (2.1), and the working end thereof is hingedly connected with the pressing plate (2.2); the shell of the locking oil cylinder (2.5) is connected with the mounting groove (1), and the working end thereof is connected with the front adjusting plate (2.1).

6. The dual shaft dual wheel hugging mechanism according to claim 5, wherein, The number of the pressing plates (2.2) is two, and they are arranged in one-to-one correspondence with the two rear embracing wheel grooves (3.2.1); the number of the telescopic oil cylinders (2.3) is two, and they are arranged in one-to-one correspondence with the two pressing plates (2.2).

7. The dual-axle dual-wheel hub-holding mechanism according to claim 6, wherein The front embracing wheel assembly (2) further comprises a second rotating shaft; the two pressing plates (2.2) are rotatably arranged on the front adjusting plate (2.1) through the second rotating shaft.

8. A tug for an aircraft comprising a double-axle double-wheel holding mechanism according to any one of claims 5 to 7, characterized in that A traction trolley (4) is further included; a mounting opening in communication with the tail end of the vehicle body is arranged on the traction trolley (4); the double-shaft double-wheel embracing wheel mechanism is arranged on the mounting opening.

9. The aircraft tug of claim 8, wherein, The traction trolley (4) further comprises full-vector form traveling units (4.1) and lifting driving assemblies (4.2); the number of the full-vector form traveling units (4.1) is multiple, and they are uniformly arranged in pairs on the bottom of the traction trolley (4) through connecting shafts; the number of the lifting driving assemblies (4.2) is at least two groups, and they are symmetrically arranged on both sides of the bottom of the traction trolley (4); each group of the lifting driving assemblies (4.2) comprises a first connecting rod, a second connecting rod and a lifting oil cylinder; one end of the first connecting rod is hingedly connected with the connecting shaft through a first connecting seat, and the other end thereof is hingedly connected with one end of the second connecting rod; the end of the second connecting rod away from the first connecting rod is hingedly connected with the bottom of the traction trolley (4) through a second connecting seat; the shell of the lifting oil cylinder is connected with the first connecting seat, and the working end thereof is connected with the second connecting seat; A cab (4.3) arranged on the traction trolley (4) is further included; the top of the cab (4.3) is flush with the top of the traction trolley (4), and the bottom of the cab (4.3) is flush with the bottom of the traction trolley (4); It also includes a remote controller and a control room (4.4) arranged on the traction trolley (4); a hydraulic control system, a steering adjusting system and a signal receiver are arranged in the control room (4.4); the first pushing oil cylinder (3.4), the second pushing oil cylinder (3.5), the telescopic oil cylinder (2.3), the rotating oil cylinder (2.4), the locking oil cylinder (2.5) and the lifting oil cylinder are all connected with the controller; each of the full-vector form travel units (4.1) is connected with the steering adjusting system; the hydraulic control system and the steering adjusting system are both connected with the signal receiver; the signal receiver is wirelessly connected with the remote controller. It also includes a ventilation opening (4.5) arranged on the traction trolley (4) and communicating with the control room (4.4).

10. The aircraft tug of claim 9, characterized in that The number of the traction trolleys (4) is multiple, and adjacent traction trolleys (4) are connected through the connecting frames.

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