Lightweight emergency runway departure device

Abstract

The utility model provides a light -duty emergency drags away runway device, the middle part of first cantilever framework is hinged with the draw bar, and the bottom end both sides of first cantile bear and second cantilever framework are installed with buffer trundle subassembly respectively, and the inboard of first cantilever framework and second cantilever framework are installed with movable cylinder for and machine wheel cooperation respectively, and the hydraulic cylinder is hinged between first cantilever framework and second cantilever framework, and the opposite side end head of first cantilever framework and second cantilever framework is detachably installed with auxiliary screw rod subassembly through buckle mechanism, and the fixed installation of first cantilever framework is close to the side of hydraulic cylinder and is installed with guide column, and guide column and sleeve pipe fixed on second cantilever framework constitute sliding fit, and the ratchet mechanism is installed between guide column and sleeve pipe, and hydraulic cylinder is connected with hand pump subassembly installed on the top of sleeve pipe. This device can quickly assemble and dock with the fault machine wheel, and then conveniently lift the machine wheel, leave the ground, and then drag the airplane away from the runway through the traction mode.

Description

Technical Field

[0001] This utility model relates to the field of aviation equipment manufacturing, and in particular to a lightweight emergency runway towing device. Background Technology

[0002] During training or maintenance of fighter jets, fighter-bombers, and trainer aircraft, situations may arise such as tire blowouts or wheel lock-up, rendering the aircraft unable to taxi or be towed. In such cases, appropriate equipment is needed to quickly remove the aircraft from the runway. Currently, the common method involves lifting the wheels and supporting them on a roller trolley to replace wheel rolling, then towing the aircraft off the runway. This existing process is relatively cumbersome, labor-intensive, and inefficient, failing to meet the demands for rapid emergency response. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a lightweight emergency runway towing device. This device can be quickly assembled and docked with a faulty aircraft wheel, thereby easily lifting the wheel off the ground and then quickly towing the aircraft off the runway by means of towing.

[0004] To achieve the aforementioned technical features, the present invention aims to provide a lightweight emergency runway towing device comprising a first cantilever frame and a second cantilever frame arranged in parallel. A traction rod is hinged to the middle of the first cantilever frame. Buffer caster assemblies are respectively installed on both sides of the bottom of the first and second cantilever frames. Movable rollers for cooperating with machine wheels are respectively installed on the inner sides of the first and second cantilever frames. A hydraulic cylinder is hinged between the first and second cantilever frames. An auxiliary screw assembly is detachably installed on the opposite end of the first and second cantilever frames via a snap-fit ​​mechanism. A guide post is fixedly installed on the first cantilever frame near the hydraulic cylinder. The guide post and a sleeve fixed on the second cantilever frame form a sliding fit. A ratchet mechanism is installed between the guide post and the sleeve. The hydraulic cylinder is connected to a hand-cranked pump assembly installed on the top of the sleeve.

[0005] Preferably, the first cantilever frame and the second cantilever frame adopt the same structure, wherein the first cantilever frame includes a main beam, a traction seat is fixed to the middle of the outer side of the main beam, traction interfaces are provided on both sides of the traction seat, roller mounting seats are symmetrically fixed to the inner side of the main beam, adapter plates are fixed to the bottom of both ends of the main beam, a short sleeve is fixed to one end of the main beam through a first reinforcing plate, a fixed chuck is provided to the other end of the main beam, and a hydraulic cylinder mounting lug is fixed to the main beam on the side near the first reinforcing plate.

[0006] Preferably, the traction rod includes a traction rod body, with a U-shaped head at one end of the traction rod body that is hinged to the first cantilever frame, a connecting ring at the tail end of the traction rod body, and handles on both sides of the tail end of the traction rod body.

[0007] Preferably, the buffer caster assembly includes a wheel plate fixedly connected to the adapter plate, a buffer pad is provided between the wheel plate and the adapter plate, and a caster is installed at the bottom end of the wheel plate.

[0008] Preferably, the movable roller includes parallelly arranged conversion lugs, which are connected to the roller mounting base by conversion pins, and connecting rods and rollers are installed in parallel between the conversion lugs.

[0009] Preferably, the latching mechanism includes a movable chuck that is hinged to the bottom of the fixed chuck, and the top opening of the movable chuck cooperates with a hinged bolt locking mechanism hinged to the top of the fixed chuck to lock it in place. The auxiliary lead screw assembly includes a lead screw body, with a forward threaded post and a reverse threaded post respectively provided at both ends of the lead screw body.

[0010] Preferably, the guide post includes a guide post body, and a first gear groove is machined at the top end of the guide post body; The sleeve includes a sleeve body, a pump mounting base for installing a hand-cranked pump assembly is fixed to the top of the sleeve body, a connecting seat for fixing a second cantilever frame is fixed to the top of the sleeve body, a second reinforcing plate is fixed between the pump mounting base and the connecting seat, a second gear groove is machined on the top of the sleeve body, and a sliding copper bushing is installed at the end of the sleeve body.

[0011] Preferably, the ratchet mechanism includes a gear seat fixed to the top of the sleeve body, a gear mounted on the gear seat via a ratchet shaft, the gear and the first gear groove of the guide post forming a gear transmission engagement, a ratchet mounted on the outer end of the ratchet shaft via a friction plate and a locking nut, the ratchet and the pawl forming a ratchet-pawl engagement, and the pawl being fixed to the outer wall of the sleeve body via a pawl mounting pin.

[0012] Preferably, the hand-cranked pump assembly includes a hand-cranked pump, an oil tank is fixed to the side of the hand-cranked pump, and the oil outlet of the hand-cranked pump is connected to the hydraulic cylinder through an integrated valve block.

[0013] The present invention has the following beneficial effects: 1. The emergency runway towing device of this utility model uses a hydraulic cylinder to pull the cantilever rollers on both sides to compress the wheel. When the sum of the components of the compressive force in the direction of gravity is greater than the load of the wheel, the wheel is lifted, thereby replacing the wheel that has blown out or locked the brakes to bear the weight of the aircraft.

[0014] 2. This utility model can be designed in multiple sets as needed. Each set of emergency runway removal device is equipped with one front wheel emergency runway removal device and two main wheel emergency runway removal devices. The main wheel emergency runway removal device adopts a symmetrical structure design, and only the position of the traction rod needs to be adjusted to apply to the left and right wheels.

[0015] 3. The rated load of the emergency runway towing device for the front wheel of this utility model is 1500kg, and the rated load of the emergency runway towing device for the main wheel is 4000kg. The hydraulic cylinder is designed with a rod chamber and a rated pulling force of 30kN to ensure that the device can clamp and lift the wheel without using a jack.

[0016] 4. The emergency runway towing device of this utility model adopts a movable design. Four casters with directional locks are installed on the device. The casters have the characteristics of flexible rotation. After clamping the lifting wheels, they can replace the function of the wheels. Together with the aircraft tow bar, they enable the aircraft to move flexibly.

[0017] 5. The emergency runway towing device of this utility model has a reasonable roller adjustment range design to meet the external dimensions of different models of wheels in different states.

[0018] 6. The emergency runway towing device of this utility model is equipped with two different roller heights according to the wheel size of different models and the center height of the wheel hub in different states. The corresponding roller is selected to clamp and lift the machine wheel according to the pulling force output by the hydraulic cylinder required for the roller to squeeze and lift.

[0019] 7. This utility model utilizes the structural characteristics of the aircraft landing gear wheel installation, using a protruding roller to connect with the aircraft's nose wheel and main landing gear. When the emergency runway towing device is working, it only contacts the aircraft's nose wheel and main landing gear, and will not contact other parts of the aircraft.

[0020] 8. The emergency runway towing device of this utility model adopts manual hydraulic assistance, which greatly reduces the manual operation force, reduces labor intensity, and improves work efficiency.

[0021] 9. The emergency runway removal device of this utility model adopts a symmetrical U-shaped opening structure design, which facilitates the docking of the emergency runway removal device with the wheels. At the same time, it can be used for docking with the main wheels on the left and right sides by simply adjusting the position of the traction rod.

[0022] 10. The emergency runway towing device of this utility model uses hydraulically assisted extrusion of the machine wheel to lift the machine wheel. The connection between the device and the machine wheel is stable and reliable, which can effectively prevent the machine wheel from slipping off the device during the towing process.

[0023] 11. In order to resist the bending moment generated by the hydraulic cylinder when driving the roller extrusion machine wheel tire or relative movement, the emergency runway removal device of this utility model is provided with a guide column, sleeve tube and ratchet mechanism parallel to the hydraulic cylinder on one side to ensure that the rollers on both sides of the device are in a parallel state when working.

[0024] 12. This utility model is equipped with a ratchet and pawl mechanism on the guide column assembly. In the event of an unexpected failure of the hydraulic system of the emergency runway towing device, the guide column is mechanically braked to prevent the wheels from suddenly falling to the ground and causing safety risks.

[0025] 13. This utility model aims to improve the stress state of the emergency runway towing device after the nose wheel bears the weight of the aircraft wheel, so that it can withstand the maximum traction force when the aircraft tow bar directly tows the device. The open side of the device is connected into a closed structure with a better stress state to ensure safe use.

[0026] 14. Except for the hydraulic cylinder, the emergency runway towing hydraulic system of this utility model adopts an integrated design, integrating the main components into the control valve block to reduce the number of connecting pipelines.

[0027] 15. The single-unit emergency runway towing device of this utility model is equipped with 4 casters, which are equipped with a braking device and have a locking function to ensure stability.

[0028] 16. The emergency runway towing device of this utility model has a shock absorption mechanism between the cantilever and the wheel, which has good shock absorption performance and can prevent the vibration during the towing process from being transmitted to the machine body and damaging the machine body or equipment on the machine.

[0029] 17. The emergency runway towing device for the nose wheel of this utility model has a towing interface set on the outer side of the cantilever according to the size of the aircraft towing interface. When the device is used to connect with the nose wheel, the aircraft towing bar is directly connected to the towing interface on the device for aircraft towing. The device and the aircraft towing bar will not interfere with each other when the aircraft is towed.

[0030] 18. The hydraulic cylinder of the hydraulic system of this utility model is a double-acting cylinder, which facilitates the adjustment of the distance between the two rollers.

[0031] 19. The working medium of the hydraulic system of this utility model is No. 15 aviation hydraulic oil.

[0032] 20. The hydraulic system of the emergency runway towing device of this utility model is equipped with an overflow valve to limit the maximum output pressure of the system.

[0033] 21. The hydraulic cylinders of the hydraulic system and the various structural components of the emergency runway removal device of this utility model are designed with a safety factor of 3 to ensure that the emergency runway removal device has sufficient structural strength.

[0034] 22. The emergency runway towing device of this utility model adopts a telescopic structure to reduce its transportation volume; by selecting high-strength alloy steel and optimizing the structural design, the amount of material used is reduced, and the weight is reduced while ensuring structural strength. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This is a first-person perspective 3D view of the present invention.

[0037] Figure 2 This is a two-dimensional view of the present invention from a second perspective.

[0038] Figure 3 This is a three-dimensional view of the present invention from a third perspective.

[0039] Figure 4 This is a four-dimensional view of the present invention.

[0040] Figure 5 This is a five-dimensional view of the present invention.

[0041] Figure 6 This is the front view of the present utility model.

[0042] Figure 7 This utility model Figure 6 AA view.

[0043] Figure 8 This diagram shows the front wheel emergency towing device of this utility model in the docking state with the intact front wheel.

[0044] Figure 9 This diagram shows the docking state of the emergency runway towing device for the front wheel of this utility model with the front wheel that has suffered a tire blowout.

[0045] Figure 10 This diagram shows the connection status of the emergency runway towing device for the main engine wheel of this utility model with an intact or braked main engine wheel.

[0046] Figure 11 This diagram shows the docking status of the emergency runway towing device for the main engine wheel of this utility model with the main engine wheel that has blown out.

[0047] In the figure: 1. Traction rod; 2. First cantilever frame; 3. Second cantilever frame; 4. Movable roller; 5. Hydraulic cylinder; 6. Auxiliary screw assembly; 7. Buckling mechanism; 8. Guide column; 9. Ratchet mechanism; 10. Hand pump assembly; 11. Sleeve; 12. Buffer caster assembly. 101 traction rod body, 102 connecting ring, 103 handle, 104 U-shaped head; Hydraulic cylinder mounting lug 201, adapter plate 202, traction interface 203, traction seat 204, first reinforcing plate 205, short sleeve 206, roller mounting seat 207, fixed chuck 208, main beam 209; 401 adapter lug, 402 connecting rod, 403 roller; Screw body 601, forward threaded post 602, reverse threaded post 603; Hinged bolt locking mechanism 701, movable chuck 702; Guide column 801, first 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 base 1101, second reinforcing plate 1102, connecting base 1103, sleeve body 1104, second gear groove 1105, sliding copper bushing 1106; Buffer pad 1201, wheel plate 1202, caster 1203. Detailed Implementation

[0048] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0049] See Figure 1-7 A 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.

[0050] 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 first 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 first 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] Furthermore, the guide post 8 includes a guide post body 801, and a first 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 second reinforcing plate 1102 is fixed between the pump mounting seat 1101 and the connecting seat 1103, a second 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.

[0060] 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 first 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] Example 2: See Figure 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.

[0070] Example 3: See Figure 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.

[0071] Example 4: Another aspect of this utility model provides a method for using a lightweight emergency runway towing device, including 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 first 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 first 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 first gear groove (802) is machined at the top of the guide post body (801).

8. The lightweight emergency runway towing device according to claim 7, characterized in that: 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 second reinforcing plate (1102) is fixed between the pump mounting seat (1101) and the connecting seat (1103), a second 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).

9. The lightweight emergency runway towing device according to claim 8, 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 first 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).

10. The lightweight emergency runway towing device according to claim 1, 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).

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