Light emergency runway dragging device and using method

Abstract

The invention provides a light emergency runway dragging device and a using method, a traction rod is hinged to the middle of a first cantilever framework, buffer trundle assemblies are installed on the two sides of the bottom end of the first cantilever framework and the two sides of the bottom end of a second cantilever framework respectively, and movable rollers used for being matched with airplane wheels are installed on the inner side of the first cantilever framework and the inner side of the second cantilever framework respectively; a hydraulic cylinder is hinged between the first cantilever framework and the second cantilever framework, and the first cantilever framework and the second cantilever framework are detachably provided with auxiliary lead screw assemblies at the ends of the opposite sides of the hydraulic cylinder through buckle mechanisms; a guide column is fixedly installed on the side, close to the hydraulic cylinder, of the first cantilever framework, the guide column is in sliding fit with a sleeve pipe fixed to the second cantilever framework, a ratchet mechanism is installed between the guide column and the sleeve pipe, and the hydraulic cylinder is connected with a hand pump assembly installed on the top of the sleeve pipe. The device can be quickly assembled and butted with a failed airplane wheel, so that the airplane wheel can be conveniently lifted to leave the ground, and then an airplane is quickly dragged away from a runway in a traction mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aviation equipment manufacturing, in particular to a light emergency tow-off runway device and a use method thereof. BACKGROUND

[0002] During the training or maintenance of fighter aircraft, bomber aircraft and trainer aircraft, tire burst or wheel lock may occur, and the aircraft cannot be slid or towed, so corresponding equipment is needed to quickly remove the aircraft from the runway. At present, the commonly used method is to lift the wheels and then support the wheels on a small trolley to replace the rolling of the wheels, and then tow the aircraft off the runway. The existing operation process is relatively complicated, has high operation intensity and low work efficiency, and cannot meet the use requirements of rapid emergency treatment. SUMMARY

[0003] The purpose of the present application is to overcome the above-mentioned deficiencies, and to provide a light emergency tow-off runway device and a use method thereof, which can quickly assemble and connect with the faulty wheels, conveniently lift the wheels off the ground, and then tow the aircraft off the runway by traction.

[0004] In order to achieve the above technical features, the purpose of the present application is achieved as follows: a light emergency tow-off runway device, comprising a first suspension frame and a second suspension frame arranged in parallel, a traction rod is hingedly connected to the middle part of the first suspension frame, a buffer foot wheel assembly is installed on both sides of the bottom end of the first suspension frame and the second suspension frame, respectively, and a movable roller for cooperating with the wheel is installed on the inner side of the first suspension frame and the second suspension frame, respectively; a hydraulic cylinder is hingedly connected between the first suspension frame and the second suspension frame, and an auxiliary lead screw assembly is detachably installed on the opposite end of the hydraulic cylinder through a buckle mechanism; a guide column is fixedly installed on the first suspension frame near the side where the hydraulic cylinder is located, the guide column and a sleeve tube fixed on the second suspension frame form a sliding fit, a ratchet mechanism is installed between the guide column and the sleeve tube, and the hydraulic cylinder is connected with a hand pump assembly installed on the top of the sleeve tube.

[0005] Preferably, the first suspension frame and the second suspension frame adopt the same structure, wherein the first suspension frame comprises a main beam, a traction seat is fixedly installed on the outer side of the middle part of the main beam, traction interfaces are arranged on both sides of the traction seat, roller mounting seats are symmetrically fixed on the inner side of the main beam, a transfer plate is fixedly installed on the bottom of both ends of the main beam, a short sleeve is fixed to one of the end heads of the main beam through a reinforcing plate, a fixed chuck is arranged on the other end head of the main beam, and a hydraulic cylinder installation lug is fixedly installed on the side of the main beam near the reinforcing plate.

[0006] Preferably, the traction rod comprises a traction rod body, a U-shaped head of the traction rod body is arranged at one end of the head of the traction rod body and is used for hingedly connecting the first cantilever frame, a connecting ring is arranged at the tail end of the traction rod body, and handles are arranged on both sides of the tail of the traction rod body.

[0007] Preferably, the buffer wheel assembly comprises a wheel plate fixedly connected with the adapter plate, a buffer pad is arranged between the wheel plate and the adapter plate, and a caster is mounted at the bottom end of the wheel plate.

[0008] Preferably, the movable roller comprises parallel conversion lugs, the conversion lugs are connected with the roller mounting seat through conversion pins, and a connecting rod and a roller are parallelly mounted between the conversion lugs.

[0009] Preferably, the buckle mechanism comprises a movable chuck hingedly connected with the bottom of the fixed chuck, and the top end opening of the movable chuck is locked with a hinged bolt locking mechanism hingedly connected with the top end of the fixed chuck. The auxiliary lead screw assembly comprises a lead screw body, and positive and reverse threaded columns are arranged at both ends of the lead screw body.

[0010] Preferably, the guide column comprises a guide column body, and a gear groove is processed at the top end of the guide column body. The sleeve pipe comprises a sleeve main body, a pump mounting seat for mounting a hand pump assembly is fixed at the top of the sleeve main body, a connecting seat for fixing the second cantilever frame is fixed at the top of the sleeve main body, a reinforcing plate is fixed between the pump mounting seat and the connecting seat, a gear groove is processed at the top of the sleeve main body, and a sliding copper bushing is mounted at the end of the sleeve main body.

[0011] Preferably, the ratchet mechanism comprises a gear seat fixed at the top of the sleeve main body, a gear is mounted on the gear seat through a ratchet shaft, the gear is in gear transmission cooperation with the gear groove of the guide column, a ratchet is limitingly mounted at the outer end of the ratchet shaft through a friction plate and a locking nut, the ratchet is in ratchet-pawl cooperation with a pawl, and the pawl is fixed on the outer wall of the sleeve main body through a pawl mounting pin.

[0012] Preferably, the hand pump assembly comprises a hand pump, an oil tank is fixed at the side of the hand pump, and an oil outlet of the hand pump is connected with a hydraulic cylinder through an integrated valve block.

[0013] Another aspect of the present application provides a use method of the light-weight emergency runway towing device, comprising the following steps: When the front wheels of the airplane need to be supported and the airplane needs to be towed: S1, the emergency runway towing device is towed to the position of the wheels of the airplane by the tractor; S2, the auxiliary lead screw assembly is removed, and the first cantilever frame and the second cantilever frame of the emergency runway towing device are arranged on both sides of the wheels; S3, operating the hand pump assembly, driving the first cantilever frame and the second cantilever frame to move towards each other through the hand pump assembly, and gradually clamping the machine wheels by the movable rollers on both sides, and finally lifting the machine wheels off the ground; S4, after the clamping and lifting of the machine wheels is completed, the auxiliary lead screw is installed between the buckle mechanism of the first cantilever frame and the second cantilever frame, and the opening is tightened by adjusting the auxiliary lead screw, so as to improve the force state of the emergency off runway device. S5, the aircraft towing rod is connected with the towing interface on the device, and the aircraft can be towed off the runway or moved.

[0014] The present application has the following advantages: 1. The emergency off runway device of the present application can squeeze the machine wheels by the hydraulic cylinders and the cantilever rollers on both sides, and when the sum of the components of the squeezing force in the direction of gravity is greater than the load of the machine wheels, the machine wheels can be lifted to replace the machine wheels with tire burst or brake lock.

[0015] 2. The present application can be designed in multiple sets as needed, and each set of emergency off runway device is provided with one front machine wheel emergency off runway device and two main machine wheel emergency off runway devices, wherein the main machine wheel emergency off runway device adopts a symmetrical structure design, and only the position of the towing rod needs to be adjusted to be applicable to the left and right machine wheels.

[0016] 3. The rated load of the front machine wheel emergency off runway device of the present application is 1500kg, the rated load of the main machine wheel emergency off runway device is 4000kg, the rod cavity of the hydraulic cylinder is designed with a rated pulling force of 30kN, and the device can complete the clamping and lifting of the machine wheels without using the jack.

[0017] 4. The emergency off runway device of the present application adopts a movable design, and four universal wheels with direction locks are installed on the device. The universal wheels have the characteristics of flexible rotation, can replace the function of the machine wheels after clamping and lifting the machine wheels, and cooperate with the aircraft towing rod to make the aircraft move flexibly.

[0018] 5. The emergency off runway device of the present application meets the different sizes of different types of machine wheels in different states through reasonable design of the roller adjustment range.

[0019] 6. The emergency off runway device of the present application sets two different roller heights according to the sizes of different types of machine wheels and the center heights of different state machine wheel hubs, and selects the corresponding roller to clamp and lift the machine wheels according to the pulling force output by the hydraulic cylinder required for the roller to squeeze and lift.

[0020] 7. The present application utilizes the structural characteristics of the machine wheel installed on the aircraft landing gear, adopts protruding rollers to connect with the front machine wheels and the main machine wheels of the aircraft, and only contacts with the front machine wheels and the main machine wheels of the aircraft when the emergency off runway device works, without contacting with other parts of the aircraft.

[0021] 8. The emergency runway towing device of the present application adopts manual hydraulic assistance, greatly reduces the manual operation force, reduces the labor intensity, and improves the work efficiency.

[0022] 9. The emergency runway towing device of the present application adopts a symmetrical concave opening structure design, which facilitates the docking of the emergency runway towing device with the main wheels, and at the same time, as long as the position of the traction rod is adjusted, it can be applied to the docking of the main wheels on the left and right sides.

[0023] 10. The emergency runway towing device of the present application utilizes hydraulic assistance to extrude the wheels to achieve wheel lifting, and the connection between the device and the wheels is stable and reliable, which can effectively prevent the wheels from slipping off the device during traction.

[0024] 11. The emergency runway towing device of the present application is provided with a guide column, a sleeve pipe and a ratchet mechanism parallel to the hydraulic cylinder on one side of the hydraulic cylinder to resist the bending distance generated by the hydraulic cylinder when driving the roller to extrude the tire or relative movement, and to ensure that the rollers on both sides of the device are in a parallel state when working.

[0025] 12. The emergency runway towing device of the present application is provided with a ratchet pawl mechanism on the guide column assembly, which mechanically brakes the guide column in case of accidental failure of the hydraulic system of the emergency runway towing device, preventing the wheels from suddenly falling to the ground and causing safety risks.

[0026] 13. The emergency runway towing device of the present application is provided with a ratchet mechanism on the guide column assembly, which mechanically brakes the guide column in case of accidental failure of the hydraulic system of the emergency runway towing device, preventing the wheels from suddenly falling to the ground and causing safety risks.

[0027] 14. The emergency runway hydraulic system of the present application adopts integrated design except for the hydraulic cylinder, and the main components are integrated and installed in the control valve block to reduce the connection pipeline.

[0028] 15. The single emergency runway towing device of the present application is provided with four casters, which are equipped with brake devices and have locking function to ensure stability.

[0029] 16. The emergency runway towing device of the present application is provided with a damping mechanism between the cantilever and the wheel, which has good damping performance and can avoid transmitting vibration in the traction process to the aircraft body and damaging the aircraft body or equipment on the aircraft.

[0030] 17. The front wheel emergency runway towing device of the present application is provided with a traction interface on the outside of the cantilever according to the size of the aircraft traction interface, when the device is used to dock with the front wheel, the aircraft traction rod directly connects the traction interface on the device for aircraft traction, and the device and the aircraft traction rod do not interfere with each other when the aircraft is moved.

[0031] 18、The hydraulic system of the application selects bidirectional cylinder for the hydraulic cylinder, which is convenient for adjusting the distance between the two rollers.

[0032] 19、The hydraulic system of the application selects No.15 aviation hydraulic oil as the working medium.

[0033] 20、The hydraulic system of the emergency runway towing device of the application is provided with an overflow valve to limit the maximum output pressure of the system.

[0034] 21、The structural members and the hydraulic cylinder of the hydraulic system of the emergency runway towing device are designed according to the safety factor of 3 to ensure that the emergency runway towing device has sufficient structural strength.

[0035] 22、The emergency runway towing device of the application adopts the telescopic structure to reduce the transportation volume thereof; by selecting high-strength alloy steel and optimizing the structural design, the material usage is reduced, and the weight is reduced on the basis of ensuring the structural strength. BRIEF DESCRIPTION OF DRAWINGS

[0036] The application will be further described below in combination with the drawings and examples.

[0037] Figure 1 It is the first perspective three-dimensional view of the application.

[0038] Figure 2 It is the second perspective three-dimensional view of the application.

[0039] Figure 3 It is the third perspective three-dimensional view of the application.

[0040] Figure 4 It is the fourth perspective three-dimensional view of the application.

[0041] Figure 5 It is the fifth perspective three-dimensional view of the application.

[0042] Figure 6 It is the front view of the application.

[0043] Figure 7 It is the A-A view of the application. Figure 6

[0044] Figure 8 It is the state diagram of the front wheel emergency runway towing device of the application and the intact front wheel.

[0045] Figure 9 It is the state diagram of the front wheel emergency runway towing device of the application and the front wheel with a burst tire.

[0046] Figure 10 It is the state diagram of the main wheel emergency runway towing device of the application and the intact or brake lock main wheel.

[0047] Figure 11 ​The figure is the docking state diagram of the host wheel emergency towing off runway device and the host wheel with tire burst.

[0048] In the figure: traction rod 1, first cantilever skeleton 2, second cantilever skeleton 3, movable roller 4, hydraulic cylinder 5, auxiliary lead screw assembly 6, buckle mechanism 7, guide column 8, ratchet mechanism 9, hand pump assembly 10, sleeve tube 11, buffer caster assembly 12. Traction rod body 101, connecting ring 102, handle 103, U-shaped head 104. Hydraulic cylinder mounting lug 201, adapter plate 202, traction interface 203, traction seat 204, reinforcing plate 205, short sleeve 206, roller mounting seat 207, fixed chuck 208, main beam 209. Conversion lug 401, connecting rod 402, roller 403. Lead screw body 601, forward threaded column 602, reverse threaded column 603. Hinged bolt locking mechanism 701, movable chuck 702. Guide column body 801, gear groove 802. Gear 901, gear seat 902, ratchet 903, friction plate 904, ratchet shaft 905, pawl mounting pin 906, pawl 907. Oil tank 1001, hand pump 1002, integrated valve block 1003. Pump mounting seat 1101, reinforcing plate 1102, connecting seat 1103, sleeve main body 1104, gear groove 1105, sliding copper bushing 1106. Buffer pad 1201, wheel plate 1202, caster 1203. DETAILED DESCRIPTION

[0049] The embodiments of the present application will be further described below in conjunction with the accompanying drawings.

[0050] Reference Figures 1-7A lightweight emergency runway towing device includes a first cantilever frame 2 and a second cantilever frame 3 arranged in parallel. A traction rod 1 is hinged to the middle of the first cantilever frame 2. Buffer caster assemblies 12 are respectively installed on both sides of the bottom end of the first cantilever frame 2 and the second cantilever frame 3. Movable rollers 4 for cooperating with the wheels are respectively installed on the inner sides of the first cantilever frame 2 and the second cantilever frame 3. A hydraulic cylinder 5 is hinged between the first cantilever frame 2 and the second cantilever frame 3. An auxiliary screw assembly 6 is detachably installed on the opposite end of the first cantilever frame 2 and the second cantilever frame 3 through a snap-fit ​​mechanism 7. A guide post 8 is fixedly installed on the first cantilever frame 2 near the hydraulic cylinder 5. The guide post 8 and the sleeve tube 11 fixed on the second cantilever frame 3 form a sliding fit. A ratchet mechanism 9 is installed between the guide post 8 and the sleeve tube 11. The hydraulic cylinder 5 is connected to a hand-cranked pump assembly 10 installed on the top of the sleeve tube 11. This device can quickly assemble and dock with a faulty wheel, thereby easily lifting the wheel off the ground and then towing the aircraft quickly off the runway.

[0051] Furthermore, the first cantilever frame 2 and the second cantilever frame 3 adopt the same structure. The first cantilever frame 2 includes a main beam 209, with a traction seat 204 fixed to the middle of its outer side. Traction interfaces 203 are provided on both sides of the traction seat 204. Roller mounting seats 207 are symmetrically fixed to the inner side of the main beam 209. Adapter plates 202 are fixed to the bottom of both ends of the main beam 209. A short sleeve 206 is fixed to one end of the main beam 209 via a reinforcing plate 205. A fixing chuck 208 is provided at the other end of the main beam 209. A hydraulic cylinder mounting lug 201 is fixed to the main beam 209 near the reinforcing plate 205. The first cantilever frame 2 and the second cantilever frame 3 are the main load-bearing components, constructed from 30CrMnSiA steel plates bent and welded into a closed U-shaped structure, and undergo rigorous heat treatment to ensure sufficient structural strength and rigidity of the cantilever.

[0052] A traction seat and a traction interface are welded to the outside of the cantilever. The traction seat is used to connect the tow bar, and the traction interface is used to replace the traction interface on the aircraft nose wheel to connect the aircraft tow bar. A roller mounting seat and a hydraulic cylinder mounting lug are welded to the inside of the cantilever. The roller mounting seat is used to install the movable roller, and the hydraulic cylinder mounting lug is used for the hydraulic cylinder of the hydraulic system. A short sleeve of the guide column assembly and a locking chuck are welded to the end face of the cantilever. A transition plate of the buffer mechanism is welded to the bottom surface of the cantilever.

[0053] Furthermore, the tow bar 1 includes a tow bar body 101. One end of the tow bar body 101 has a U-shaped head 104 hinged to the first cantilever frame 2, and the tail end of the tow bar body 101 has a connecting ring 102. Handles 103 are located on both sides of the tail end of the tow bar body 101. The tow bar is mainly used for traction and steering of the emergency runway towing device. To reduce product weight, the tow bar is made of aluminum alloy and is used to connect with a towing vehicle, thereby achieving towing.

[0054] Furthermore, the buffer caster assembly 12 includes a wheel plate 1202 fixedly connected to the adapter plate 202, a buffer pad 1201 is provided between the wheel plate 1202 and the adapter plate 202, and a caster 1203 is installed at the bottom end of the wheel plate 1202. To prevent the transmission of vibrations during towing to the aircraft body when the aircraft is towing under the load of the emergency runway towing device, which could cause damage to the aircraft body or onboard equipment, a buffer device consisting of an adapter plate, a buffer pad, and a wheel plate is provided between the cantilever frame and the caster. The buffer pad of the buffer device is made of PU polyurethane board, which has the advantages of oil resistance, wear resistance, pressure resistance, and shock absorption. The buffer mechanism is assembled into a whole using studs and hexagonal nuts on the wheel plate to ensure the stability of the overall structure.

[0055] In this embodiment, the casters are customized HD-MN80-B1-DL type heavy-duty low center of gravity swivel casters, which have two black cast nylon wheels arranged side by side with double bearings. The rated load of a single caster is 1200kg. A single emergency runway towing device is equipped with 4 of these swivel casters to meet the maximum rated load of 4000kg of the emergency runway towing device.

[0056] This type of swivel wheel is equipped with a braking device and a locking function to ensure stability when parked. It also features a directional lock, allowing switching between swivel and directional modes. When moving a parked drone laterally or, the emergency runway towing device casters are switched to swivel mode, utilizing their flexible steering and movement capabilities to move the aircraft in any direction. In case of a front wheel blowout requiring emergency towing off the runway, the caster closest to the aircraft's towing bar is set to swivel mode, and the caster on the other side is set to directional mode. After connecting the towing bar to the towing interface on the front wheel emergency runway towing device, the aircraft with a blowout front wheel can be towed off the runway.

[0057] Furthermore, the movable roller 4 includes parallel-arranged conversion lugs 401, which are connected to the roller mounting base 207 via conversion pins. A connecting rod 402 and a roller 403 are mounted parallel to each other between the conversion lugs 401. To reduce the rolling resistance of the roller and improve wear resistance, the outer surface of the connecting rod and the inner and outer surfaces of the roller are hard chrome plated, and grease is applied to the mating surfaces of the roller and the roller. The movable roller is connected to the roller mounting base of the cantilever frame via bolts, and the conversion pins are used to change and fix the movable roller's state.

[0058] Furthermore, the latching mechanism 7 includes a movable chuck 702 hinged to the bottom of the fixed chuck 208. The top opening of the movable chuck 702 engages with the hinged bolt locking mechanism 701 hinged to the top of the fixed chuck 208 for locking. The latch adopts a quick-release structure design and is mainly used to fix the nut of the auxiliary lead screw assembly. The fixed latch is welded to the open end face of the cantilever, and the movable latch can rotate flexibly around the pin. When it is necessary to connect and fix the nut of the auxiliary lead screw assembly, the wing nut is loosened, and the movable chuck can be opened by rotating the hinge bolt.

[0059] Furthermore, the auxiliary lead screw assembly 6 includes a lead screw body 601, with a forward threaded post 602 and a reverse threaded post 603 respectively provided at both ends of the lead screw body 601. The auxiliary lead screw assembly is mainly used to improve the stress state of the emergency runway towing device during long-term parking or movement after the emergency runway towing device clamps and lifts the aircraft wheels, by connecting the open side of the device into a closed structure with a better stress state to ensure safe use. The forward and reverse threaded nuts of the auxiliary lead screw assembly can be quickly adjusted to their positions on the adjusting lead screw. They are connected to the first cantilever assembly and the second cantilever assembly by a snap-fit ​​mechanism. After the aircraft wheels are clamped and lifted, the forward and reverse threaded nuts are adjusted according to the distance between the two snap-fit ​​mechanisms, and the snap-fit ​​mechanisms are used to quickly fix the forward and reverse threaded nuts, thereby connecting the first cantilever assembly and the second cantilever assembly together. Then, the adjusting lead screw is driven to rotate by a ratchet wrench, and the threaded pair of the auxiliary lead screw assembly can tighten the first cantilever assembly and the second cantilever assembly.

[0060] Furthermore, the guide post 8 includes a guide post body 801, and a gear groove 802 is machined at the top end of the guide post body 801; the sleeve tube 11 includes a sleeve body 1104, a pump mounting seat 1101 for installing the hand-cranked pump assembly 10 is fixed at the top of the sleeve body 1104, a connecting seat 1103 for fixing the second cantilever frame 3 is fixed at the top of the sleeve body 1104, a reinforcing plate 1102 is fixed between the pump mounting seat 1101 and the connecting seat 1103, a gear groove 1105 is machined at the top of the sleeve body 1104, and a sliding copper bushing 1106 is installed at the end of the sleeve body 1104.

[0061] Furthermore, the ratchet mechanism 9 includes a gear seat 902 fixed to the top of the sleeve body 1104. A gear 901 is mounted on the gear seat 902 via a ratchet shaft 905. The gear 901 and the gear groove 802 of the guide post 8 form a gear transmission engagement. A ratchet 903 is mounted on the outer end of the ratchet shaft 905 via a friction plate 904 and a locking nut. The ratchet 903 and the pawl 907 form a ratchet-pawl engagement. The pawl 907 is fixed to the outer wall of the sleeve body 1104 via a pawl mounting pin 906.

[0062] The guide post assembly is formed by the guide post 8, sleeve tube 11 and ratchet mechanism 9. The guide post assembly is mainly used to assist the hydraulic cylinder in bearing the bending moment of the extruder wheel tire or relative movement when the hydraulic cylinder drives the first cantilever assembly and the second cantilever assembly and their roller extruder wheel tire or relative movement, so as to ensure the parallel movement of the first cantilever assembly and the second cantilever assembly.

[0063] The teeth machined on the guide post 8 and the gear installed on the sleeve tube 11 form a gear and rack mechanism. When the hydraulic cylinder drives the first cantilever assembly and the second cantilever assembly, the guide post 8 extends and retracts within the sleeve tube 11, driving the gear and the ratchet shaft connected to the gear by a flat key to rotate, thereby causing the ratchet to rotate as well. When the hydraulic cylinder piston rod retracts, the ratchet rotates normally. When the hydraulic cylinder piston rod extends, the ratchet is automatically restricted from rotating by a spring to prevent the hydraulic system of the emergency runway towing device from malfunctioning unexpectedly, causing the device to be unable to support the weight of the wheels, resulting in the wheels falling to the ground and creating a safety risk.

[0064] When the emergency runway towing device docks with the aircraft, pulling the pull ring on the pawl will operate the hydraulic system to drive the hydraulic cylinder piston rod to extend, thereby achieving arbitrary adjustment of the roller spacing.

[0065] Furthermore, the hand-cranked pump assembly 10 includes a hand-cranked pump 1002, with an oil tank 1001 fixed to its side. The oil outlet of the hand-cranked pump 1002 is connected to the hydraulic cylinder 5 via an integrated valve block 1003. According to design calculations, the hydraulic system is designed and selected with a rated pressure of 19 MPa, and the hydraulic cylinder is designed with a rated load of 30 kN. Considering the performance characteristics and reliability requirements of the emergency runway towing device, the hydraulic system uses an HP-10 manual pump as the power source, with a rated pressure of 25 MPa, which meets the hydraulic system pressure requirements.

[0066] The hydraulic system mainly consists of a control valve block, an oil tank, and connected actuators. The oil tank is mounted on the valve block via a flange connection. The control valve block integrates hydraulic components such as the oil tank, oil filter, drain valve, manual pump, check valve, directional valve, safety valve, and shut-off valve.

[0067] The hydraulic cylinder is the main actuator of the emergency runway towing device, providing power to clamp and lift the wheels, ensuring that the device can bear the weight of the wheels. Designed with a rated load of 6000 kg, the hydraulic cylinder is made of high-strength 30CrMnSiA material and undergoes rigorous heat treatment. Weight is minimized as much as possible while ensuring structural strength.

[0068] The hydraulic cylinder mainly consists of a piston rod, upper cover, cylinder, piston, bottom cover, and sealing rings. The bottom cover is fixed to the cantilever assembly 2, and the piston rod is fixed to the cantilever assembly 1. Oil is supplied through the hydraulic system, causing the piston rod to retract and thus fixing the wheel. The hydraulic cylinder's hydraulic stroke is designed to be 160mm, with a minimum working length of 313mm and a maximum working length of 473mm.

[0069] The inner bore of the hydraulic cylinder is honed—hard chrome plated—honed again, which ensures the hardness and smoothness of the inner wall of the cylinder and improves its wear resistance. The roughness of the inner cylinder can reach Ra0.4, reducing wear on the sealing ring and effectively improving the service life of the actuator. At the same time, it ensures that the piston rod of the actuator extends and retracts at a uniform, stable, safe and reliable speed throughout its entire stroke range, without impact, vibration, jamming, or jumping.

[0070] Example 2: See Figures 8-9 In this embodiment, the emergency runway towing device is mainly adapted to the nose wheel, and therefore serves as an emergency runway towing device for the nose wheel. Specifically, in this embodiment, the rated load of the emergency runway towing device for the nose wheel is designed to be 1500 kg.

[0071] Example 3: See Figures 10-11 In this embodiment, the emergency runway towing device is mainly adapted to the main engine wheel, and therefore serves as the main engine wheel emergency runway towing device. In this embodiment, the rated load of the main engine wheel emergency runway towing device is 4000 kg. The main engine wheel emergency runway towing device differs from the front engine wheel emergency runway towing device in that it does not have a locking mechanism 7 and an adjusting auxiliary screw 6.

[0072] Example 4: Another aspect of the present invention provides a method of using a lightweight emergency runway towing device, comprising the following steps: When it is necessary to support the aircraft's nose wheels in order to tow the aircraft: S1, the emergency runway towing device is towed to the location of the aircraft's wheels by a towing vehicle: S2, remove the auxiliary screw assembly 6, and place the first cantilever frame 2 and the second cantilever frame 3 of the emergency runway towing device on both sides of the wheel; S3, operate the hand pump assembly 10, drive the first cantilever frame 2 and the second cantilever frame 3 to move towards each other through the hand pump assembly 10, and cause the movable rollers 4 on both sides to gradually clamp the machine wheel, and finally cause the machine wheel to be lifted off the ground. S4. After the wheel clamping and lifting is completed, the auxiliary screw 6 is installed between the first cantilever frame 2 and the second cantilever frame 3 and the buckling mechanism 7. The auxiliary screw 6 is adjusted to tighten the opening to improve the stress state of the wheel emergency towing off the runway device. S5, then connect the aircraft towing bar to the towing interface on the device to tow the aircraft off the runway or move it.

Claims

1. A lightweight emergency runway towing device, characterized in that, The system includes a first cantilever frame (2) and a second cantilever frame (3) arranged in parallel. A traction rod (1) is hinged to the middle of the first cantilever frame (2). Buffer caster assemblies (12) are respectively installed on both sides of the bottom end of the first cantilever frame (2) and the second cantilever frame (3). Movable rollers (4) for cooperating with the machine wheels are respectively installed on the inner sides of the first cantilever frame (2) and the second cantilever frame (3). A hydraulic cylinder (5) is hinged between the first cantilever frame (2) and the second cantilever frame (3). The second cantilever frame (3) has an auxiliary screw assembly (6) detachably installed on the opposite end of the hydraulic cylinder (5) via a snap-fit ​​mechanism (7); the first cantilever frame (2) has a guide post (8) fixedly installed on the side near the hydraulic cylinder (5), the guide post (8) and the sleeve tube (11) fixed on the second cantilever frame (3) form a sliding fit, a ratchet mechanism (9) is installed between the guide post (8) and the sleeve tube (11), and the hydraulic cylinder (5) is connected to a hand-cranked pump assembly (10) installed on the top of the sleeve tube (11).

2. The lightweight emergency runway towing device according to claim 1, characterized in that: The first cantilever frame (2) and the second cantilever frame (3) adopt the same structure. The first cantilever frame (2) includes a main beam (209). A traction seat (204) is fixed on the middle of the outer side of the main beam (209). Traction interfaces (203) are provided on both sides of the traction seat (204). Roller mounting seats (207) are symmetrically fixed on the inner side of the main beam (209). A transition plate (202) is fixed at the bottom of both ends of the main beam (209). A short sleeve (206) is fixed at one end of the main beam (209) through a reinforcing plate (205). A fixed chuck (208) is provided at the other end of the main beam (209). A hydraulic cylinder mounting lug (201) is fixed on the side of the main beam (209) near the reinforcing plate (205).

3. The lightweight emergency runway towing device according to claim 1, characterized in that: The traction rod (1) includes a traction rod body (101), with a U-shaped head (104) hinged to the first cantilever frame (2) at one end of the traction rod body (101), a connecting ring (102) at the tail end of the traction rod body (101), and handles (103) on both sides of the tail of the traction rod body (101).

4. The lightweight emergency runway towing device according to claim 2, characterized in that: The buffer caster assembly (12) includes a wheel plate (1202) fixedly connected to the adapter plate (202), a buffer pad (1201) is provided between the wheel plate (1202) and the adapter plate (202), and a caster (1203) is installed at the bottom of the wheel plate (1202).

5. The lightweight emergency runway towing device according to claim 2, characterized in that: The movable roller (4) includes parallel-arranged conversion lugs (401), which are connected to the roller mounting base (207) by conversion pins. A connecting rod (402) and a roller (403) are installed in parallel between the conversion lugs (401).

6. The lightweight emergency runway removal device according to claim 2, characterized in that: The buckling mechanism (7) includes a movable chuck (702) hinged to the bottom of the fixed chuck (208), and the top opening of the movable chuck (702) is engaged with the hinge bolt locking mechanism (701) hinged to the top of the fixed chuck (208) for locking. The auxiliary lead screw assembly (6) includes a lead screw body (601), and the two ends of the lead screw body (601) are respectively provided with a forward threaded post (602) and a reverse threaded post (603).

7. The lightweight emergency runway towing device according to claim 2, characterized in that: The guide post (8) includes a guide post body (801), and a gear groove (802) is machined at the top of the guide post body (801). The sleeve tube (11) includes a sleeve body (1104), a pump mounting seat (1101) for installing a hand-cranked pump assembly (10) is fixed on the top of the sleeve body (1104), a connecting seat (1103) for fixing a second cantilever frame (3) is fixed on the top of the sleeve body (1104), a reinforcing plate (1102) is fixed between the pump mounting seat (1101) and the connecting seat (1103), a gear groove (1105) is machined on the top of the sleeve body (1104), and a sliding copper bushing (1106) is installed at the end of the sleeve body (1104).

8. The lightweight emergency runway towing device according to claim 7, characterized in that: The ratchet mechanism (9) includes a gear seat (902) fixed on the top of the sleeve body (1104). A gear (901) is mounted on the gear seat (902) via a ratchet shaft (905). The gear (901) and the gear groove (802) of the guide post (8) form a gear transmission engagement. A ratchet (903) is mounted on the outer end of the ratchet shaft (905) via a friction plate (904) and a locking nut. The ratchet (903) and the pawl (907) form a ratchet-pawl engagement. The pawl (907) is fixed on the outer wall of the sleeve body (1104) via a pawl mounting pin (906).

9. The lightweight emergency runway towing device according to claim 7, characterized in that: The hand pump assembly (10) includes a hand pump (1002), an oil tank (1001) is fixed to the side of the hand pump (1002), and the oil outlet of the hand pump (1002) is connected to the hydraulic cylinder (5) through an integrated valve block (1003).

10. The method of using the lightweight emergency runway towing device according to any one of claims 1-9, characterized in that, Includes the following steps: When it is necessary to support the aircraft's nose wheels in order to tow the aircraft: S1, the emergency runway towing device is towed to the location of the aircraft's wheels by a towing vehicle: S2, remove the auxiliary screw assembly (6), and set the first cantilever frame (2) and the second cantilever frame (3) of the emergency runway towing device on both sides of the wheel; S3, operate the hand pump assembly (10), drive the first cantilever frame (2) and the second cantilever frame (3) to move towards each other through the hand pump assembly (10), and make the movable rollers (4) on both sides gradually clamp the wheel, and finally make the wheel lift off the ground; S4. After the wheel clamping and lifting is completed, the auxiliary screw (6) is installed between the first cantilever frame (2) and the second cantilever frame (3) and the buckling mechanism (7). The auxiliary screw (6) is adjusted to tighten the opening to improve the stress state of the wheel emergency towing off the runway device. S5, then connect the aircraft towing bar to the towing interface on the device to tow the aircraft off the runway or move it.

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