A fighter aircraft main wheel mounting device

Abstract

The present invention relates to a fighter main wheel installation device, which belongs to the field of aviation equipment technology. The device comprises: a frame, a lifting mechanism, a grabbing mechanism, a pitch adjustment mechanism and a rotating mechanism; the lifting mechanism is installed on the frame in a vertical direction, the pitch adjustment mechanism is installed on the lifting mechanism, the rotating mechanism is installed on the pitch adjustment mechanism, and the grabbing mechanism is installed on the rotating mechanism; the device grabs and fixes the fighter main wheel through the grabbing mechanism, and realizes up and down movement on the frame in a vertical direction through the lifting mechanism, the rotating mechanism realizes the rotation of the fighter main wheel around the axis, and the pitch adjustment mechanism realizes the pitch of the fighter main wheel axis relative to the horizontal plane, so as to meet the attitude adjustment requirements during the installation of the fighter main wheel, and can realize the safe and convenient installation of the main wheel of the Su series aircraft.

Description

Technical Field

[0001] The invention relates to a main wheel mounting device for a fighter aircraft, belonging to the technical field of aviation equipment. Background Art

[0002] The main wheels on the landing gear of the Su-series main combat aircraft weigh about 200kg and have a diameter of more than 1000mm. They are large and heavy. During the disassembly and maintenance process, multiple people are required to lift them off the ground, adjust the angles in multiple directions, and insert the main wheel axle into the landing gear wheel brake disc to install them. In the existing technology, there is no special tooling equipment for assembly except for simple raising tools such as crowbars and wooden blocks. With the increase in the intensity and difficulty of flight training, more and higher requirements are put forward for flight support. The installation method of main combat aircraft main wheels by lifting and prying with sticks can no longer meet the needs of safe and fast ground support. With the existing installation method, the main wheels are heavy and have no fulcrum. Multiple people are required to participate in the disassembly and assembly of the main wheels. The work intensity of the personnel is high, and errors are prone to occur in the coordination of personnel, resulting in injuries to personnel and damage to parts. There are safety hazards in the work process. Summary of the invention

[0003] In view of the defects of the prior art, the purpose of the present invention is to provide a fighter main wheel installation device, which can realize the functions of grabbing and fixing, lifting and lowering, forward and backward overall movement, main wheel rotation around the axis, main wheel pitch adjustment, etc. for the main wheel of the main fighter aircraft, so as to fully meet the main wheel posture adjustment requirements during the main wheel installation process, and can realize the safe and convenient installation of the main wheels of the Su series aircraft.

[0004] The objectives of the present invention are achieved through the following technical solutions.

[0005] A fighter aircraft main wheel mounting device, comprising: a frame, a lifting mechanism, a grabbing mechanism, a pitch adjustment mechanism and a rotating mechanism;

[0006] The lifting mechanism is installed on the frame in the vertical direction, the pitch adjustment mechanism is installed on the lifting mechanism, the rotating mechanism is installed on the pitch adjustment mechanism, and the grabbing mechanism is installed on the rotating mechanism;

[0007] The grasping mechanism is used to grasp and fix the main wheel of the fighter aircraft, the lifting mechanism is used to drive the main wheel of the fighter aircraft to move up and down in the vertical direction on the frame, the rotating mechanism is provided with an output shaft, and the output shaft is coaxially connected with the main wheel of the fighter aircraft. The output shaft drives the main wheel of the fighter aircraft to rotate around its own axis, and the pitch adjustment mechanism is used to adjust the pitch angle of the axis of the main wheel of the fighter aircraft relative to the horizontal plane, so as to adjust the posture of the main wheel of the fighter aircraft during the installation process.

[0008] Furthermore, the skeleton is a vertical frame surrounded by an upper cross beam, a lower cross beam and two vertical outer beams; side rods are vertically installed at both ends of the lower cross beam of the vertical frame, and fixed wheels and universal wheels are respectively installed at both ends of the side rods; two inner beams are vertically installed in parallel between the two outer beams of the vertical frame, and a handrail is installed on the side of the outer beam close to the universal wheel.

[0009] Furthermore, the lifting mechanism includes a lifting middle frame, a reducer, a drum, a lifting crank, a steel cable, a pulley block and a linear guide rail; the lifting middle frame is a rectangular structure surrounded by L-profiles, and the skeleton is provided with two linear guide rails along the vertical direction, and the lifting middle frame is installed and restricted on the two linear slide rails, and slides with the slide rails; the reducer is fixedly installed on the skeleton, and the output shaft of the reducer is connected to the drum, and the two steel cables wrapped on the drum are changed in direction through the pulley block and are respectively connected to the upper end of the lifting middle frame; the reducer input shaft is installed with a lifting crank for controlling the lifting of the steel cable.

[0010] Furthermore, the pitch adjustment mechanism includes a pitch middle frame, an adjustment screw rod, a pitch crank and a limit arm; the pitch middle frame is a rectangular structure surrounded by L-shaped materials, and the lower end of the pitch middle frame is positioned at the lower end of the lifting middle frame through two pins; two vertical upright plates B are installed below the horizontal part of the L-shaped beam at the upper end of the pitch middle frame, and a limit baffle is installed between the upright plates B, the surface where the limit baffle is located is perpendicular to the surface where the vertical upright plate is located, and a through hole is processed in the center of the limit baffle;

[0011] Two vertical upright plates A are installed below the horizontal part of the L-shaped cross beam at the upper end of the lifting middle frame. A through hole is processed in the center of the upright plate A. The two ends of the central hole shaft pin are fixedly connected to the through holes processed in the center of the two upright plates A. A radial threaded through hole is processed in the middle of the central hole shaft pin; an elliptical through hole is also processed in the vertical part of the L-shaped cross beam at the upper end of the lifting middle frame. The position of the elliptical through hole is coaxial with the position of the threaded through hole of the central hole pin shaft, and the aperture of the elliptical through hole is larger than the motion trajectory of the pitch adjustment screw rod;

[0012] A limit pin is provided at one end of the adjustment screw rod, and the end is connected with a nut after passing through the through hole of the limit partition of the pitch middle frame, and the nut and the limit pin are respectively located on both sides of the limit partition, and the nut and the limit pin limit the axial position of the adjustment screw rod; the other end of the adjustment screw rod passes through the elliptical through hole and the threaded through hole in the radial direction of the middle hole shaft pin in sequence, and is connected with the pitch crank handle; the adjustment screw rod is threadedly matched with the threaded through hole in the radial direction of the middle hole shaft pin;

[0013] The two limit arms are L-shaped, with the ends facing downward, one end fixed to the upper cross beam of the lifting middle frame, and the ends extending to the pitching middle frame to limit the pitching middle frame.

[0014] Furthermore, the rotating mechanism includes a turntable, a rack and a lock; the turntable is composed of a front end face of the turntable, a rear end face of the turntable and a rolling bearing; the rear end face of the turntable is fixed on the pitch mechanism, the inner circumference of the rear end face of the turntable is coaxially fixedly connected to the inner ring of the rolling bearing, the inner circumference of the front end face of the turntable is coaxially fixedly connected to the outer ring of the rolling bearing, and an annular space for rack installation is formed between the rear end face of the turntable and the front end face of the turntable, and a rack is installed on the outer circumference of the outer ring of the rolling bearing; the lock is fixed to the upper end of the pitch adjustment mechanism, and a claw is below the lock, which engages with the rack when it is lowered to limit the rotation of the turntable.

[0015] Furthermore, the gripping mechanism comprises a wheel frame, a supporting wheel axle, a supporting wheel, an L-shaped supporting arm and a clamping claw;

[0016] The wheel frame is fixedly connected to the output shaft of the rotating mechanism; two upper support arms and two lower support arms are connected to the outer circumferential surface of the wheel frame; wherein, the end of the lower support arm is connected to one end of the supporting wheel axle, and the other end of the supporting wheel axle is connected to a wasp-waist-shaped support wheel; the upper support arm is a hollow structure and is processed with a positioning pin hole; one end of the L-shaped support arm is processed with an adjustment hole, and is inserted into the hollow structure of the upper support arm, and the positioning pin is passed through the positioning pin hole and the adjustment hole to fix the upper support arm and the L-shaped support arm of the wheel frame; the clamping claw is arc-shaped, and a screw rod is installed on the outer circumferential surface of the arc, which is detachably installed on the other end of the L-shaped support arm through the screw rod thread, and the two wasp-waist-shaped support wheels and the two clamping claws are in contact with the outer surface of the fighter main wheel to grab and fix the fighter main wheel.

[0017] Furthermore, one end of the L-shaped arm extending into the hollow structure of the upper arm is processed with one or more adjustment holes, and the upper arm is processed with one or more positioning pin holes; the support wheels are all made of rubber, and each upper and lower arm is provided with a rubber boss, and each of the claws is installed with a rubber pad.

[0018] Furthermore, the middle parts of the frame, lifting mechanism, grasping mechanism, pitch adjustment mechanism and rotating mechanism are all processed with through holes coaxial with the output shaft of the rotating mechanism, and the through holes together constitute a coaxial wheel axle installation channel.

[0019] Furthermore, the diameter of the wheel axle mounting channel is not less than 300 mm.

[0020] Beneficial Effects

[0021] (1) The present invention provides a fighter aircraft main wheel installation device, which can lift and pitch the aircraft main wheel through a lifting mechanism, a pitch adjustment mechanism, and a rotating mechanism, and simultaneously rotate around an axis to achieve multi-dimensional adjustment; the aircraft main wheel can be quickly positioned and firmly grasped through a grasping mechanism to achieve safe and convenient installation;

[0022] (2) The present invention provides a main wheel mounting device for a fighter aircraft, wherein a universal wheel and a positioning wheel are mounted at the lower end of an I-shaped frame at the bottom of the frame, and a handrail is mounted on one side of the external beam of the frame close to the universal wheel to facilitate pushing, pulling and overall movement;

[0023] (3) The present invention provides a fighter aircraft main wheel installation device, wherein the lifting mechanism of the device uses a reducer cable structure to realize the main wheel lifting and hovering functions, which is convenient for operation and hovering, and avoids problems such as complex structure, oil leakage, and operation lag;

[0024] (4) The present invention provides a main wheel installation device for a fighter aircraft, wherein the pitch adjustment mechanism of the device is composed of a pitch middle frame, an adjustment screw rod, a crank handle and a limit arm, and the pitch can be adjusted while the device is lifted and lowered. The device adopts a separate opening and closing structure, and the upper frame screw adjustment method can reduce the load-bearing state of the adjustment part, realize the one-point adjustment of the crank handle, and the adjustment method is easy to observe;

[0025] (5) The present invention provides a main wheel installation device for a fighter aircraft, wherein the rotating mechanism of the device is composed of a turntable, a rack and a lock, and can realize rotation around the axis while adjusting the elevation and pitch. The turntable design with a large inner diameter is adopted to realize multi-dimensional adjustment;

[0026] (6) The present invention provides a fighter aircraft main wheel installation device, wherein the gripping mechanism of the device is composed of a wheel frame, a supporting wheel, an L-shaped support arm, a clamping claw, etc. The clamping claw is a detachable screw-in structure. During installation, the L-shaped support arm connected with the clamping claw can be quickly positioned by a pin, and then fine-tuned and tightened by a screw; during disassembly, the pressing force can be released by rotating the screw, and then the pin can be pulled out and the clamping claw can be rotated to let the main wheel out of the channel; the gripping is firm and easy to disassemble quickly;

[0027] (7) The present invention provides a fighter aircraft main wheel installation device, the device adopts an all-round rubber protection design, and all points that may be connected with the main wheel tire are equipped with rubber protection isolation, using three forms (rubber bosses set on the upper and lower arms, rubber pads in the claws, and rubber support wheels connected to the lower arm) for a total of 8 points, whether it is disassembling or installing the main wheel, it can well protect the main wheel tread;

[0028] (8) The present invention provides a main wheel installation device for a fighter aircraft, wherein the middle parts of the frame, lifting mechanism, grasping mechanism, pitch adjustment mechanism and rotating mechanism are processed with through holes coaxial with the output shaft of the rotating mechanism, and the through holes together constitute a coaxial wheel axle installation channel; the diameter of the wheel axle installation channel is not less than 300 mm, ensuring that the main wheel can be safely and conveniently installed on the device without adding additional protective work and measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a fighter aircraft main wheel installation device and a partial enlarged schematic diagram;

[0030] Figure 2 This is a partially enlarged schematic diagram of a fighter aircraft main wheel installation device;

[0031] Figure 3 This is a schematic diagram of a main wheel mounting device skeleton for a fighter aircraft;

[0032] Figure 4 This is a schematic diagram of a lifting mechanism for a fighter aircraft main wheel mounting device;

[0033] Figure 5 This is a schematic diagram of a pitch adjustment mechanism of a fighter aircraft main wheel mounting device;

[0034] Figure 6 A schematic diagram of the rotating mechanism of a fighter aircraft main wheel mounting device

[0035] Figure 7 This is a schematic diagram of the grabbing structure of a fighter aircraft main wheel installation device;

[0036] Figure 8 This is a schematic diagram of the wheel axle installation channel of a fighter aircraft main wheel installation device;

[0037] Among them, 1-frame, 2-lifting mechanism, 3-grasping mechanism, 4-pitch adjustment mechanism, 5-rotation mechanism, 6-axle installation channel, 1.1-directional wheel, 1.2-universal wheel, 1.3-upper beam, 1.4-external beam, 1.5-inner beam, 1.6-inner beam, 1.7-handrail, 1.8-lower beam, 1.9-side rod, 2.1-lifting middle frame, 2.2-reducer, 2.3-drum wheel, 2.4-lifting crank, 2.5-steel Cable, 2.6-pulley block, 2.7-linear guide, 3.1-wheel frame, 3.2-support wheel shaft, 3.3-support wheel, 3.4-L-type support arm, 3.5-claw, 3.6-locating pin hole, 3.7-rubber boss, 4.1-pitch middle frame, 4.2-adjusting screw rod, 4.3-pitch crank, 4.4-limiting arm, 4.5-vertical plate A, 4.6-pin shaft, 4.7-vertical plate B, 5.1-turntable, 5.2-rack, 5.3-lock. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] This embodiment provides a fighter aircraft main wheel installation device, such as Figures 1-2As shown, it includes: a skeleton 1, a lifting mechanism 2, a grabbing mechanism 3, a pitch adjustment mechanism 4 and a rotating mechanism 5; the lifting mechanism 2 is installed on the skeleton 1 along the vertical direction, the pitch adjustment mechanism 4 is installed on the lifting mechanism 2, the rotating mechanism 5 is installed on the pitch adjustment mechanism 4, and the grabbing machine 3 is installed on the rotating mechanism 5;

[0041] The grasping mechanism 3 is used to grasp and fix the fighter main wheel, the lifting mechanism 2 is used to drive the fighter main wheel to move up and down in the vertical direction on the frame 1, and the rotating mechanism 5 is provided with an output shaft, which is coaxially connected to the fighter main wheel. The output shaft drives the fighter main wheel to rotate around its own axis through the output shaft, and the pitch adjustment mechanism 4 is used to adjust the pitch angle of the fighter main wheel axis relative to the horizontal plane, so as to adjust the posture of the fighter main wheel during the installation process.

[0042] like Figure 3 As shown, the skeleton 1 is a vertical frame surrounded by an upper crossbeam 1.3, a lower crossbeam 1.8 and two vertical outer beams 1.4; side rods 1.9 are vertically installed at both ends of the lower crossbeam 1.3 of the vertical frame; a universal wheel 1.2 is installed at one end of the side rod 1.9 close to the lower crossbeam 1.3, and a fixed wheel 1.1 is installed at the end away from the lower crossbeam 1.3; two inner beams 1.5 are vertically and parallelly installed between the two outer beams 1.4 of the vertical frame, an inner crossbeam 1.6 is horizontally installed between one outer beam 1.4 and the adjacent inner beam 1.5, and a handrail 1.7 is installed on the side of the outer beam close to the universal wheel; the roller and the handrail facilitate the overall movement of the main wheel mounting device.

[0043] like Figure 4As shown, the lifting mechanism 2 includes a lifting middle frame 2.1, a speed reducer 2.2, a drum wheel 2.3, a lifting crank 2.4, a steel cable 2.5, a pulley block 2.6 and a linear guide rail 2.7; the lifting middle frame 2.1 is a rectangular structure surrounded by L-shaped materials, two linear guide rails 2.7 are installed on the two inner vertical beams 1.5 of the frame 1, and the lifting middle frame 2.1 is installed and restricted on the two linear slide rails 2.7, and slides with the slide rails; the speed reducer 2.2 is fixedly installed on the inner cross beam 1.6 of the frame 1, and the output shaft of the speed reducer 2.2 is connected to the drum wheel 2.3, and two steel cables 2.5 are wound around the drum wheel 2.3, and the two steel cables 2.5 are respectively downward, and are returned in the gap between the inner and outer vertical beams where the speed reducer 2.2 is placed through a fixed pulley. Upward to the upper crossbeam 1.3 of the skeleton 1, and then downward again through the fixed pulley installed in the upper crossbeam 1.3, and connected to the upper crossbeam of the lifting middle frame 2.1; the fixed pulley installed in the lifting mechanism 2 constitutes a pulley group 2.6; the input shaft of the reducer 2.2 is installed with a lifting crank 2.4 for operating the lifting cable 2.5; in this embodiment, the lifting crank 2.4 is a foldable winch crank; the lifting middle frame 2.1 is limited on two linear slide rails 2.7, and slides with the slide rails, and the lifting and lowering crank 2.4 drives the input shaft of the reducer 2.2 to rotate, and then drives the output shaft to rotate, and then drives the drum wheel 2.3 connected to the output shaft to rotate, and the drum wheel 2.3 drives the lifting middle frame 2.1 up and down through the cable 2.5;

[0044] like Figure 5 As shown, the pitch adjustment mechanism 4 includes a pitch middle frame 4.1, an adjustment screw rod 4.2, a pitch crank 4.3 and a limit arm 4.4; the pitch middle frame 4.1 is a hollow rectangular structure surrounded by L-shaped materials, the lower end of the pitch middle frame 4.1 is positioned at the lower end of the lifting middle frame 2.1 through two pins 4.6, and two vertical upright plates B 4.7 are installed below the horizontal part of the L-shaped cross beam at the upper end of the pitch middle frame 4.1. A limit baffle (not shown in the figure) is installed between the two vertical upright plates B 4.7, the surface where the limit baffle is located is perpendicular to the surface where the vertical upright plate is located, and a through hole (not shown in the figure) is processed in the center of the limit baffle;

[0045] Two vertical upright plates A4.5 are installed below the horizontal part of the L-shaped crossbeam at the upper end of the lifting middle frame 2.1. A through hole is processed in the center of the upright plate. The two ends of the center hole shaft pin (not marked in the figure) are fixedly connected to the through holes processed in the center of the two upright plates A4.5. A radial threaded through hole is processed in the middle of the center hole shaft pin; an elliptical through hole (not marked in the figure) is processed in the vertical part of the L-shaped profile at the upper end of the lifting middle frame 2.1. The position of the elliptical through hole is coaxial with the radial threaded through hole processed in the center of the center hole pin shaft, and the aperture of the elliptical hole is larger than the motion trajectory of the adjustment screw rod 4.2 during the pitch movement, and is used to accommodate the passage of the adjustment screw rod 4.2 during the pitch movement;

[0046] A limit pin is provided at one end of the adjustment screw rod 4.2, and the end is connected with a nut after passing through the through hole of the limit partition of the pitch middle frame 4.1, and the nut and the limit pin are respectively located on both sides of the limit partition (not marked in the figure), and the nut and the limit pin axially limit the adjustment screw rod so that the adjustment screw rod and the pitch middle frame will not have relative linear motion; the other end of the adjustment screw rod passes through the elliptical through hole and the radial threaded through hole of the middle hole shaft pin in turn, and is connected with the crank interface, and the pitch crank handle 4.3 is installed on the crank interface; the adjustment screw rod 4.2 is threadedly matched with the radial threaded through hole of the middle hole shaft pin;

[0047] The pitch crank 4.3 is rotated to drive the adjusting screw rod 4.2 to rotate in the threaded through hole in the middle of the middle hole pin shaft. Since the two ends of the middle hole pin shaft are limited, the adjusting screw rod 4.2 drives the pitch middle frame 4.1 to pitch around the two pin shafts 4.6 at the lower end of the pitch middle frame to achieve pitch adjustment; one end of the two limiting arms 4.4 is fixed to the upper end crossbeam of the lifting middle frame 2.1, and the other end extends to the pitch middle frame 4.1. The limiting arms 4.4 are L-shaped, with the ends facing downward, to limit the pitch middle frame 4.1, and can hook the pitch middle frame 4.1 in abnormal situations to prevent the pitch middle frame 4.1 from tipping over together with the main wheels of the load;

[0048] like Figure 6 As shown, the rotating mechanism 5 includes a turntable 5.1, a rack 5.2 and a lock 5.3; the turntable 5.1 is composed of a front end face of the turntable, a rear end face of the turntable and a rolling bearing; in this embodiment, the rolling bearing is a ball bearing; balls are installed between the inner and outer rings of the bearing to change sliding friction into rolling friction; the rear end face of the turntable is fixedly installed on the pitch middle frame 4.1, the inner circumferential surface of the rear end face of the turntable is coaxially fixedly connected with the inner ring of the ball bearing, the inner circumferential surface of the front end face of the turntable is coaxially fixedly connected with the outer ring of the ball bearing, and an annular installation space is formed between the rear end face of the turntable and the front end face of the turntable, and a rack is installed on the outer circumferential surface of the outer ring of the ball bearing; the lock is fixed to the upper end of the pitch adjustment mechanism, and a claw is below the lock 5.3, and the claw is lowered to engage with the rack 5.2 to limit the rotation of the turntable 5.1.

[0049] like Figure 7As shown, the grabbing mechanism 3 includes a wheel frame 3.1, a supporting wheel axle 3.2, a supporting wheel 3.3, an L-shaped support arm 3.4 and a clamping claw 3.5; the wheel frame 3.1 is fixedly mounted on the front end surface of the turntable of the rotating mechanism 5; two upper support arms and two lower support arms are connected to the outer circumferential surface of the wheel frame 3.1; wherein the end of the lower support arm is connected to one end of the supporting wheel axle 3.2, and the other end of the supporting wheel axle 3.2 is connected to the supporting wheel 3.3, and the supporting wheel 3.3 is a wasp waist type, which is used to hold up the lower tread of the main wheel; the upper support arm is a hollow structure, and is processed with one or more positioning pins Hole 3.6; one end of the L-shaped support arm 3.4 is processed with one or more adjustment holes and inserted into the hollow structure of the upper support arm, and a positioning pin is used to cross the positioning pin hole 3.6 and the adjustment hole to fix the upper support arm of the wheel frame 3.1 and the L-shaped support arm 3.4, and it can also adapt to the installation of main wheels with different diameters; the clamping claw 3.5 is arc-shaped, and a screw rod is installed on the outer surface of the arc-shaped outer circle. It is detachably installed on the other end of the L-shaped support arm 3.4 through the screw rod thread, and the two bee waist support wheels and the two clamping claws are in contact with the outer surface of the fighter main wheel to grab and fix the fighter main wheel;

[0050] During installation, the claw 3.5 can be quickly positioned by the pin first, and then fine-tuned and tightened by the screw; during disassembly, the pressing force can be released by rotating the screw first, and then the pin can be pulled out, the claw can be selected, and it can be quickly disassembled to let the main wheel out of the channel; the claw 3.5 is lined with a rubber pad and contacts the upper tread of the main wheel; the two claws of the grasping mechanism 4 are respectively installed with inner lining rubber pads, the upper and lower arms are respectively provided with rubber bosses 3.7, and the two lower arms are respectively connected to rubber support wheels 3.3. The grasping mechanism 4 adopts 3 forms and a total of 8 places for rubber protection isolation, which can well protect the main wheel tread during both disassembly and installation.

[0051] like Figure 8 As shown, the skeleton 1, the lifting middle frame 2.1, the pitching middle frame 4.1 and the middle part of the turntable 5.1 are all processed with through holes coaxial with the output shaft of the rotating mechanism, and the through holes together constitute a coaxial wheel axle installation channel 6 greater than 300mm that penetrates the fighter main wheel installation device, and the wheel axle installation channel 6 is used for the installation of the inner sleeve, fan, bearing and other components of the fighter main wheel axle.

[0052] Example 2

[0053] This embodiment provides a method for installing a main wheel of a fighter aircraft based on the first embodiment, and the method comprises the following steps:

[0054] The first step is to lift the fighter main wheel to be installed and stand it on the ground, operate the lifting crank 2.4 to lower the lifting mechanism 2 until the support wheel shaft 3.2 in the grabbing mechanism 3 is 1 to 3 cm above the ground; push the fighter main wheel installation device described in Example 1 to be coaxial with the main wheel, and gradually approach it until the support wheel 3.3 is placed just below the tire near the contact point between the main wheel and the ground, and the support wheel 3.3 is lifted by the lifting crank 2.4 until it just contacts the main wheel, lift and rotate the two L-shaped support arms 3.4 installed in the grabbing mechanism 3, so that the claws 3.5 are placed on the tread of the main wheel, and the L-shaped support arm positioning pins are inserted. The other end of the L-shaped support arm 3.4 is detachably screwed with a screw rod, which is connected to the claw 3.5, and the screw rod is adjusted to the two support wheels 3.3 and the two claws 3.5 to reliably fix the main tire tread; operate the lifting crank 2.4 to make the lifting mechanism 2 drive the grabbing mechanism 3 and the main wheel to rise until the main wheel is 50 to 150 cm above the ground;

[0055] The second step is to push the fighter main wheel installation device to the installation location so that the main wheel is directly opposite to the landing gear support wheel shaft on which the main wheel is installed, and adjust the lifting mechanism 2 again until the main wheel axis and the landing gear support wheel shaft are at the same height;

[0056] Step 3: Adjust the pitch handle to 4.3 until the landing gear wheel brake disc surface is parallel to the main wheel surface;

[0057] The fourth step is to open the lock of the rotating mechanism 5, rotate the wheel frame 3.1, so that the inner groove teeth of the main wheel hub to be installed and the groove teeth of the landing gear wheel brake disc are embedded and aligned with each other, push the fighter main wheel installation device, insert the brake disc into the main wheel hub, and install the main wheel shaft inner sleeve, fan, bearing, nut and other components through the hollow wheel shaft installation channel reserved in the fighter main wheel installation device;

[0058] The fifth step is to release the clamping force by rotating the screw connected to the claw 3.5 after the installation is completed, and then pull out the pin and rotate the claw 3.5 to let the main wheel out of the channel; shake the lifting crank 2.4 to lower the lifting mechanism to disengage the main wheel installation device from the main wheel, and pull the handrail 1.7 to push the main wheel installation device away as a whole.

[0059] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fighter aircraft main wheel mounting device, characterized in that: include: Frame, lifting mechanism, grasping mechanism, pitch adjustment mechanism and rotating mechanism; The lifting mechanism is installed on the frame in the vertical direction, the pitch adjustment mechanism is installed on the lifting mechanism, the rotating mechanism is installed on the pitch adjustment mechanism, and the grabbing mechanism is installed on the rotating mechanism; The grabbing mechanism is used to grab and fix the main wheel of the fighter, the lifting mechanism is used to drive the main wheel of the fighter to move up and down in the vertical direction on the frame, the rotating mechanism is provided with an output shaft, the output shaft is coaxially connected with the main wheel of the fighter, and the main wheel of the fighter is driven to rotate around its own axis through the output shaft, and the pitch adjustment mechanism is used to adjust the pitch angle of the axis of the main wheel of the fighter relative to the horizontal plane, so as to adjust the posture of the main wheel of the fighter during the installation process; The lifting mechanism includes a lifting middle frame, a speed reducer, a drum wheel, a lifting crank, a steel cable, a pulley block and a linear guide rail; the lifting middle frame is a rectangular structure surrounded by L-shaped materials, and the frame is provided with two linear guide rails in the vertical direction, and the lifting middle frame is installed and restricted on the two linear slide rails and slidably cooperates with the slide rails; the speed reducer is fixedly installed on the frame, and the output shaft of the speed reducer is connected to the drum wheel, and the two steel cables wound on the drum wheel are respectively connected to the upper end of the lifting middle frame after changing direction through the pulley block; the input shaft of the speed reducer is provided with a lifting crank for controlling the lifting of the steel cable; The pitch adjustment mechanism includes a pitch middle frame, an adjustment screw rod, a pitch crank and a limit arm; the pitch middle frame is a rectangular structure surrounded by L-shaped materials, and the lower end of the pitch middle frame is positioned at the lower end of the lifting middle frame through two pins; two vertical upright plates B are installed below the horizontal part of the L-shaped crossbeam at the upper end of the pitch middle frame, and a limit baffle is installed between the upright plates B, the surface where the limit baffle is located is perpendicular to the surface where the vertical upright plate is located, and a through hole is processed in the center of the limit baffle; Two vertical upright plates A are installed below the horizontal part of the L-shaped cross beam at the upper end of the lifting middle frame. A through hole is processed in the center of the upright plate A. The two ends of the central hole shaft pin are fixedly connected to the through holes processed in the center of the two upright plates A. A radial threaded through hole is processed in the middle of the central hole shaft pin; an elliptical through hole is also processed in the vertical part of the L-shaped cross beam at the upper end of the lifting middle frame. The position of the elliptical through hole is coaxial with the position of the threaded through hole of the central hole pin shaft, and the aperture of the elliptical through hole is larger than the motion trajectory of the pitch adjustment screw rod; A limit pin is provided at one end of the adjustment screw rod, and after the end passes through the through hole of the limit partition of the pitch middle frame, it is connected with a nut, and the nut and the limit pin are respectively located on both sides of the limit partition, and the nut and the limit pin limit the axial position of the adjustment screw rod; the other end of the adjustment screw rod passes through the elliptical through hole and the radial threaded through hole of the middle hole shaft pin in sequence, and is connected with the pitch crank handle; the adjustment screw rod is threadedly matched with the radial threaded through hole of the middle hole shaft pin; The two limit arms are L-shaped, with the ends facing downwards. One end is fixed to the upper crossbeam of the lifting middle frame, and the end extends to the pitching middle frame to limit the pitching middle frame. The rotating mechanism comprises a turntable, a rack and a lock; the turntable is composed of a front end face of the turntable, a rear end face of the turntable and a rolling bearing; the rear end face of the turntable is fixed on the pitch mechanism, the inner circumference of the rear end face of the turntable is coaxially fixedly connected with the inner ring of the rolling bearing, the inner circumference of the front end face of the turntable is coaxially fixedly connected with the outer ring of the rolling bearing, and an annular space for rack installation is formed between the rear end face of the turntable and the front end face of the turntable, and a rack is installed on the outer circumference of the outer ring of the rolling bearing; the lock is fixed on the upper end of the pitch adjustment mechanism, and a claw is below the lock, and the claw is engaged with the rack when it is lowered to limit the rotation of the turntable; The gripping mechanism comprises a wheel frame, a supporting wheel axle, a supporting wheel, an L-shaped supporting arm and a clamping claw; The wheel frame is fixedly connected to the output shaft of the rotating mechanism; two upper support arms and two lower support arms are connected to the outer circumferential surface of the wheel frame; wherein, the end of the lower support arm is connected to one end of the supporting wheel axle, and the other end of the supporting wheel axle is connected to a wasp-waist-shaped support wheel; the upper support arm is a hollow structure and is processed with a positioning pin hole; one end of the L-shaped support arm is processed with an adjustment hole, and is inserted into the hollow structure of the upper support arm, and the positioning pin is passed through the positioning pin hole and the adjustment hole to fix the upper support arm and the L-shaped support arm of the wheel frame; the clamping claw is arc-shaped, and a screw rod is installed on the outer circumferential surface of the arc, which is detachably installed on the other end of the L-shaped support arm through the screw rod thread, and the two wasp-waist-shaped support wheels and the two clamping claws are in contact with the outer surface of the fighter main wheel to grab and fix the fighter main wheel.

2. A fighter aircraft main wheel mounting device according to claim 1, characterized in that: The skeleton is a vertical frame surrounded by an upper crossbeam, a lower crossbeam and two vertical outer beams; side rods are vertically installed at both ends of the lower crossbeam of the vertical frame, and fixed wheels and universal wheels are respectively installed at both ends of the side rods; two inner beams are vertically installed in parallel between the two outer beams of the vertical frame, and a handrail is installed on the side of the outer beam close to the universal wheel.

3. The main wheel mounting device for a fighter aircraft according to claim 1, characterized in that: The end of the L-shaped support arm extending into the hollow structure of the upper support arm is processed with one or more adjustment holes, and the upper support arm is processed with one or more positioning pin holes; the support wheels are all made of rubber, and each upper and lower support arm is provided with a rubber boss, and each of the claws is installed with a rubber pad.

4. A fighter aircraft main wheel mounting device according to any one of claims 1 to 3, characterized in that: The middle parts of the frame, lifting mechanism, grabbing mechanism, pitch adjustment mechanism and rotating mechanism are all processed with through holes coaxial with the output shaft of the rotating mechanism, and the through holes together constitute a coaxial wheel axle installation channel.

5. A fighter aircraft main wheel mounting device according to claim 4, characterized in that: The diameter of the wheel axle mounting channel is not less than 300 mm.

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