CN112829962A - Wheel holding mechanism for aircraft tractor - Google Patents

Wheel holding mechanism for aircraft tractor Download PDF

Info

Publication number
CN112829962A
CN112829962A CN202110032877.9A CN202110032877A CN112829962A CN 112829962 A CN112829962 A CN 112829962A CN 202110032877 A CN202110032877 A CN 202110032877A CN 112829962 A CN112829962 A CN 112829962A
Authority
CN
China
Prior art keywords
telescopic
oil cylinder
clamping device
cylinder
hinged
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110032877.9A
Other languages
Chinese (zh)
Inventor
杨鹏波
王大鹏
李博
杨珂
刘胜利
赵成军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baoji Hewitt Machinery Technology Co ltd
Original Assignee
Baoji Hewitt Machinery Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baoji Hewitt Machinery Technology Co ltd filed Critical Baoji Hewitt Machinery Technology Co ltd
Priority to CN202110032877.9A priority Critical patent/CN112829962A/en
Publication of CN112829962A publication Critical patent/CN112829962A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F1/00—Ground or aircraft-carrier-deck installations
    • B64F1/22—Ground or aircraft-carrier-deck installations installed for handling aircraft
    • B64F1/225—Towing trucks
    • B64F1/227—Towing trucks adapted for directly connecting to aircraft, e.g. trucks without tow-bars

Abstract

The invention provides a wheel clasping mechanism for an aircraft tractor, which belongs to the technical field of tractors and is used for clasping and lifting tires of an undercarriage when the tractor is in butt joint with the undercarriage of the aircraft, so that clasping and clamping of the tires of the aircraft can be realized, the tires of the aircraft can be synchronously moved and adjusted to the position of the motion center of a vehicle body of the tractor, the wheel clasping mechanism can be integrally lifted and put down by adopting lifting oil cylinders arranged at four corners of the wheel clasping mechanism, a new stress balance state can be formed by automatic rising or falling according to the height change of the tires of the undercarriage of the aircraft, the wheel clasping mechanism is prevented from causing torsion injury to the undercarriage, the wheel clasping mechanism is reasonable in stress and simple and convenient to operate, the undercarriage of the aircraft can be fully protected, the automatic operation control can be conveniently realized.

Description

Wheel holding mechanism for aircraft tractor
Technical Field
The invention belongs to the technical field of tractors, and particularly relates to a wheel clasping mechanism for an aircraft tractor.
Background
The existing aircraft tractors, most of which are divided into two-door hydraulic ram type structures by wheel-holding mechanisms (also called lifting devices or jacking devices, etc.), such as electric rodless aircraft tractors of patent CN201923323U, clamping-lifting devices of rodless aircraft tractors of CN104002986A, or single-door lock-hook type structures with hydraulic ram, such as electric rodless aircraft tractors of CN107054681A and remote control electric rodless aircraft tractors of CN 204846391U, have the following problems in terms of structural analysis:
1) no matter be single door or double door, it is all bigger to open a shelves width in it, gives the aircraft landing gear tire enough width size of letting out after the door is opened in order to guarantee that the tire can get into, if: the double-door structure is made into a vertical rectangular section structure in order to give way to the tire of the landing gear, and a single door needs to be opened forwards to be large enough or is positioned outside a vehicle body after being opened to give way to the tire of the landing gear of the airplane.
2) The stress is not good, the operation is inconvenient: the double-door structure is made into a vertical rectangular structure to block the tire in order to give way to the tire of the landing gear, and the downward gravity of the double-door structure is borne by a rear bucket; the single-door structure is arc-shaped or the lower part of the single-door structure is provided with a flat plate for bearing. Whether the single door or the double door is opened, the gravity center of the rear landing gear with the wheel clasping mechanism holding the tire is mostly positioned outside the fulcrum, for example, the landing gear tire of the CN107054681A rodless aircraft tractor is positioned outside the fulcrum of the second hydraulic cylinder.
In order to ensure good stress, the tires of the airplane are lifted and moved to the upper part of a bearing part or the tire of a nose landing gear is moved to the upper part of the bearing part by advancing the airplane in some existing tractors, and by adopting the mode, the operation difficulty is higher and collision is easy to occur for the airplane with the higher weight; for an aircraft tire to be outside the stressed pivot point, the overall structure must be large enough to ensure the necessary strength and stiffness.
3) The main oil cylinder of most aircraft nose landing gear has a certain inclination angle relative to the vertical direction of the ground, when a tractor pulls the aircraft, the tires deflect around the axis of the main oil cylinder, at the moment, the ground clearance of the left and right tires changes, and the left and right tires rotate around the intersection point of the main oil cylinder of the landing gear and the axis of the tires, and the rotation centers of the tires of the aircraft with different sizes and different intervals are different.
Most of the existing aircraft tractors do not have left and right tire height change compensation measures, a swing mode of a wheel clasping mechanism is adopted individually, the wheel clasping mechanism disclosed in the patent CN107054681A rodless aircraft tractor adopts a fixed-height rotating shaft suspension type wheel clasping mechanism to deflect around a rotating shaft with a fixed height (a rotating center line of a wheel clasping platform), the compensation requirement of height change of diameters of tires of different models cannot be met, when the diameters of the tires are changed, a swing center of the wheel clasping mechanism is not overlapped with a tire rotating center, theoretically, the wheel clasping mechanism clasps the tires of an undercarriage to realize that the whole undercarriage rotates around the rotating center line of the wheel clasping platform integrally, the undercarriage can be connected with the airplane and cannot rotate actually, and certain torsion damage can be caused to the undercarriage if the.
In view of the above problems in the prior art, there is a need for improvement.
Disclosure of Invention
The technical problems solved by the invention are as follows: the invention provides a wheel clasping mechanism for an aircraft tractor, which is used for clasping and lifting an undercarriage tire when the tractor is in butt joint with an aircraft undercarriage, not only realizing clasping and clamping the aircraft tire and synchronously moving and adjusting the aircraft tire to the position of the motion center of a vehicle body of the tractor, but also realizing the integral lifting and lowering of the wheel clasping mechanism by adopting lifting oil cylinders arranged at four corners of the wheel clasping mechanism, automatically ascending or descending according to the height change of the tire of the aircraft undercarriage to form a new stress balance state so as to avoid the torsion injury of the wheel clasping mechanism to the undercarriage, has reasonable stress and simple and convenient operation, can fully protect the aircraft undercarriage, is convenient to realize automatic operation control, and is suitable for clasping and clamping the tires of the aircraft undercarriage with different sizes in a certain range.
The technical scheme adopted by the invention is as follows: the wheel embracing mechanism for the aircraft tractor comprises a wheel embracing mechanism, wherein the wheel embracing mechanism is arranged at the middle position of the tractor and consists of a frame assembly, a front left embracing and clamping device, a front right embracing and clamping device, a rear embracing and clamping device, a pressing device, a lifting device, a guiding and limiting device, a hydraulic system, a safety control system, a left telescopic big arm and a right telescopic big arm;
the frame assembly is of a C-shaped layout structure with a front opening, a left telescopic big arm and a right telescopic big arm are respectively arranged on the left side and the right side of the frame assembly in a horizontal sliding mode, a front left holding clamp device is hinged to the front end of the left telescopic big arm, a front right holding clamp device is hinged to the front end of the right telescopic big arm, a rear holding clamp device is arranged at the rear part of the frame assembly, and a pressing device is arranged at the upper end part of the rear holding clamp device;
the left telescopic large arm and the right telescopic large arm can drive the front left clamping device and the front right clamping device to synchronously move back and forth and horizontally and vertically rotate inwards relative to the corresponding telescopic large arms to clamp the tires of the aircraft landing gear when synchronously acting through a hydraulic system, and the rear clamping device moves back and forth through the hydraulic system and presses the tires of the aircraft landing gear through a pressing device; the synchronous forward-backward movement adjustment of the front left clamping device, the front right clamping device and the rear clamping device enables the tire of the aircraft landing gear to be positioned at the front and rear central positions of the tractor and realizes the automatic approaching and optimal contact of the tire of the aircraft landing gear;
four corners of two sides of the frame assembly are connected with a tractor body through lifting devices, the lifting devices synchronously act to realize integral lifting and descending of the frame assembly, and meanwhile, the lifting devices can automatically lift or descend according to height changes of tires of an aircraft undercarriage to form a new stress balance state so as to avoid torsion damage to the undercarriage caused by the wheel clasping mechanism;
the guide limiting device is arranged between the side part of the frame assembly and the tractor body and can limit the position of the frame assembly in the front-back direction and the left-right direction when the frame assembly is lifted up or put down according to the lifting device.
The technical scheme is further limited, the frame assembly comprises a frame left part, a frame right part and a rectangular cross beam, the frame left part and the frame right part are connected together through the rectangular cross beam, and a joint is reinforced through a reinforcing rib plate I and a reinforcing rib plate II; the left side and the right side of the upper part of the rectangular cross beam are connected with telescopic oil cylinders A, rear seats A for installing the telescopic oil cylinders A are arranged on the left side and the right side of the upper part of the rectangular cross beam, the rear ends of the telescopic oil cylinders A are connected with the rear seats A in the horizontal direction through pin shafts A, and meanwhile the telescopic oil cylinders A can swing up and down around the axial lead of the rear seats A;
the left part and the right part of the frame have the same structure and are in bilateral symmetry; the left part of the frame is formed by welding a rectangular crossbeam a, a C-shaped channel steel, a transverse reinforcing beam and a C-shaped reinforcing plate; the C-shaped stand column I and the C-shaped stand column II are welded to the outer side of the rectangular girder a, the C-shaped stand column I is vertically welded to the outer side of the front end of the C-shaped channel steel, and the C-shaped stand column II is vertically welded to the outer side of the rear portion of the rectangular girder a; the upper part of the rectangular girder a is provided with a telescopic oil cylinder B, the back of the upper part of the rectangular girder a is provided with a rear seat B connected with the back end of the telescopic oil cylinder B, the back end of the telescopic oil cylinder B is connected with the rear seat B through a pin shaft B, and meanwhile, the telescopic oil cylinder B can swing up and down around the axis line of the rear seat B; a telescopic oil cylinder C is arranged at the upper part of the C-shaped channel steel, a rear seat C is welded at the upper part of the C-shaped channel steel, the rear end of the telescopic oil cylinder C is connected with the rear seat C in the vertical direction through a pin shaft C, and meanwhile, the telescopic oil cylinder C can swing left and right in the horizontal direction around the axis line of the rear seat C; a notch K is formed in one side, close to the telescopic oil cylinder C, of the C-shaped stand column I, so that a swinging space is reserved for the telescopic oil cylinder C to swing left and right in the horizontal direction around the axis line of the rear seat C; a composite roller II is arranged on the lower side in front of the C-shaped upright post I and the lower side behind the C-shaped upright post II, and at least 2 composite rollers I which are horizontally arranged are arranged on the inner side of the rectangular girder a in the horizontal direction; the rectangular girder a is in a rectangular steel pipe structure, and guide sliding blocks are arranged on the horizontal plane and the vertical plane inside the front end of the rectangular girder a.
The technical scheme is further limited, the left telescopic big arm and the right telescopic big arm are in a left-right symmetrical structure;
the rear part of the left large telescopic arm is a left rectangular cylinder, four planes close to the end part of the left large telescopic arm are provided with left guide sliding blocks, the left head part of the left large telescopic arm is of a semicircular structure and is provided with a mounting hole for mounting a left large arm main shaft, the left large arm main shaft connects the left large telescopic arm with a front left clamping device, the front left clamping device can horizontally rotate around the central axis of the left large arm main shaft, and meanwhile, the head part of the telescopic oil cylinder A is provided with a mounting hole and is connected to the upper part of the left large arm main shaft; the left rectangular column body at the rear part of the left telescopic big arm is arranged in an inner hole of a rectangular girder a at the left part of the frame, and the left telescopic big arm is limited to move up and down and left and right through a left guide sliding block and a guide sliding block in the inner hole of the rectangular girder a, so that the function that the left telescopic big arm can only stretch back and forth is achieved; the outer side of the left head of the left telescopic big arm is provided with a left composite roller, and when the left telescopic big arm is stretched back and forth, the left composite roller rolls in a track of a C-shaped channel steel of the frame assembly to ensure that the left telescopic big arm is well stressed;
the rear part of the right telescopic big arm is a right rectangular cylinder, four planes close to the end part of the right telescopic big arm are provided with right guide sliding blocks, the right head part of the right telescopic big arm is of a semicircular structure and is provided with a mounting hole for mounting a right big arm main shaft, the right telescopic big arm and a front right clamping device are connected together by the right big arm main shaft, the front left clamping device can rotate around the central axis of the right big arm main shaft, and meanwhile, the head part of a telescopic oil cylinder A on the right side of the frame assembly is provided with a mounting hole and is connected to the upper part of the right big arm main shaft; the right rectangular column body at the rear part of the right telescopic big arm is arranged in an inner hole of a rectangular girder a at the right part of the frame, and a right guide slide block at the rear part of the right telescopic big arm and a guide slide block in the inner hole of the rectangular girder a are combined to limit the up-down and left-right movement of the right telescopic big arm so as to achieve the function that the right telescopic big arm can only stretch back and forth; and a right composite roller is arranged on the outer side of the right head of the right telescopic boom, and when the right telescopic boom stretches forwards and backwards, the right composite roller on the right telescopic boom rolls in a track of a C-shaped channel steel on the right side of the frame assembly to ensure that the right telescopic boom is well stressed.
The technical scheme is further limited, the front left clamping device and the front right clamping device have the same structure and are symmetrical left and right;
the front left clamping device is arranged at the front part of the left telescopic big arm and can rotate around the axial lead of the left big arm main shaft through the hinged connection of the left big arm main shaft; the front left clamping device comprises a left clamping frame, a left clamping lower seat, a left turning cylinder, a left turning eccentric wheel, a left bushing, a left self-locking cylinder, a left guide sleeve, a left bearing and a left end face bearing; the left holding and clamping frame is of an integral structure welded or cast in a frame mode, an upper left mounting seat and a lower left mounting seat are arranged on the left side of the left holding and clamping frame, and left mounting holes for a left large arm spindle to penetrate through are formed in the upper left mounting seat and the lower left mounting seat; the left upper mounting seat and the left lower mounting seat are mounted at the head part of a main shaft of the left big arm through a left end face bearing, and the left end face bearing transmits the gravity borne by the left clamping device to the left telescopic big arm; the left clamping lower seat is hinged with a left side hole I on the left lower side of the left clamping frame through a left lining and a left turning eccentric wheel, the left clamping lower seat is hinged with a right side hole I on the right lower side of the left clamping frame through a left lining and a left guide sleeve, and the left side hole I and the right side hole I are designed coaxially and are used for ensuring that the left clamping lower seat can rotate around the axial lead of the left clamping lower seat; the upper part of the left overturning cylinder is hinged with a left upper cross beam of the left holding clamp frame through a left cylinder seat, the lower part of the left overturning cylinder is hinged with a left overturning eccentric wheel, and a left piston rod of the left overturning cylinder can drive the left overturning eccentric wheel to rotate around the left axial lead of the left hole I and the left axial lead of the right hole I through telescopic action and realize the up-and-down overturning of the left holding clamp lower seat; the left turning eccentric wheel is connected with the left clamp lower seat through a left bolt);
the rotation action of the front left clamping device adopts a connecting rod principle: a left hinge mounting hole is formed in the upper left mounting seat of the left holding and clamping frame and is hinged with the head of the telescopic oil cylinder C through a left hinge shaft; the flexible direction of the left flexible hydro-cylinder B of frame assembly is parallel with the flexible direction of the big arm of left side flexible, the left side outside of flexible hydro-cylinder B is arranged in to the left flexible hydro-cylinder C of frame assembly, left side articulated mounting hole is in the left side outside of left axial lead direction of left side hole I and right side hole I and the skew front side.
The front right clamping device is mounted at the front part of the right telescopic big arm and is hinged through a right big arm main shaft, and the front right clamping device can rotate around the axial lead of the right big arm main shaft; the front right clamping device comprises a right clamping frame, a right clamping lower seat, a right turning cylinder, a right turning eccentric wheel, a right bushing, a right self-locking cylinder, a right guide sleeve, a right bearing and a right end face bearing; the right holding and clamping frame is of an integral structure welded or cast in a frame mode, a right upper mounting seat and a right lower mounting seat are arranged on the right side of the right holding and clamping frame, and right mounting holes for allowing a right large arm spindle to penetrate through are formed in the right upper mounting seat and the right lower mounting seat; the right upper mounting seat and the right lower mounting seat are mounted at the head part of the right telescopic big arm through a right end face bearing, and the right end face bearing transmits the gravity borne by the right clamping device to the right telescopic big arm; the right holding clamp lower seat is hinged with a right side hole II on the lower right side of the right holding clamp frame through a right bushing and a right turning eccentric wheel; the right holding clamp lower seat is hinged with a left side hole II on the left lower side of the right holding clamp frame through a right bushing and a right guide sleeve, and the right side hole II and the left side hole II are coaxially designed and are used for ensuring that the right holding clamp lower seat can rotate around the axial lead of the right holding clamp lower seat; the upper part of the right overturning cylinder is hinged with a right upper cross beam of the right holding clamp frame through a right cylinder seat, the lower part of the right overturning cylinder is hinged with a right overturning eccentric wheel, and a right piston rod of the right overturning cylinder can drive the right overturning eccentric wheel to rotate around the right axial lead of the right hole II and the left hole II through telescopic action and further realize the up-and-down overturning of the right holding clamp lower seat; the right overturning eccentric wheel is connected with the right clamp lower seat through a right bolt;
the rotation action of the front right clamping device adopts a connecting rod principle: a right hinged mounting hole is formed in the right upper mounting seat of the right holding and clamping frame and is hinged and connected with the head of the telescopic oil cylinder C through a right hinged shaft; the telescopic direction of a telescopic oil cylinder B on the right side of the frame assembly is parallel to the telescopic direction of the right telescopic boom, a telescopic oil cylinder C on the right side of the frame assembly is arranged on the right outer side of the right telescopic oil cylinder B, and a right hinged mounting hole is arranged on the right outer side of the right axial lead direction of the right side hole II and the left side hole II and is deviated to the front side;
the left locking cylinder is arranged at the upper part of the front left clamping device, and the tail part of the left locking cylinder is hinged with a left cylinder seat at the inner side of the upper beam of the left clamping frame; when the left clamping device and the right clamping device are locked in a closed mode, a left locking metal piston rod of the left locking cylinder penetrates through a hole in the middle of the left bushing to stretch out, so that the left clamping device (200) and the front right clamping device are connected in series for locking;
the right locking cylinder is arranged at the lower part of the front right clamping device, the tail part of the right locking cylinder is hinged with a right cylinder seat on the inner side of a lower beam of the right clamping frame, and when the front left clamping device and the front right clamping device are locked in a closed mode, a right locking piston rod of the right locking cylinder penetrates through a hole in the middle of the right guide sleeve and a left guide sleeve of the left clamping frame to enable the left clamping frame and the left clamping frame to be connected in series to achieve locking.
The technical scheme is further limited, the rear clamping device is provided with a welded rear clamping body, the rear clamping body is formed by welding a bucket, a left rail, a right rail and a cross beam into a whole, the left rail is welded at the front, rear, upper and lower middle positions on the left side of the bucket, the right rail is welded at the front, rear, upper and lower middle positions on the right side of the bucket, a support for installing a pressing plate arm of the pressing device is welded at the upper part of the bucket, the cross beam is welded at the rear part of the bucket, and the cross beam, the bucket, the left rail and the right rail are welded together in a reinforcing manner to bear larger weight; the support is arranged on the left side and the right side of the upper part of the bucket respectively and is provided with a pressing plate arm pin shaft, the two pressing plate arm pin shafts are coaxially arranged, and the pressing plate arms can rotate around the axial lead of the pressing plate arm pin shafts; the rear upper part of the cross beam is welded with a platen oil cylinder tail support, the platen oil cylinder tail supports are respectively arranged at left and right symmetrical positions, a platen oil cylinder tail pin shaft is arranged in a mounting hole of the platen oil cylinder tail support, the tail part of a platen oil cylinder is hinged and arranged on the platen oil cylinder tail pin shaft, the two platen oil cylinder tail pin shafts are coaxially arranged, and the platen oil cylinder can rotate around the axial lead of the platen oil cylinder tail pin shaft; hinged mounting holes for the telescopic oil cylinders A are formed in the left side and the right side of the bucket, a telescopic oil cylinder hinged front pin shaft is mounted in the mounting holes, the two telescopic oil cylinders hinged front pin shafts are coaxially arranged, and the telescopic oil cylinders A can rotate around the axial lead of the telescopic oil cylinder hinged front pin shaft;
the left rail and the right rail of the rear clamping device are respectively in butt joint with the composite rollers I on the inner sides of the rectangular girders a on the left side and the right side of the frame assembly, the composite rollers I on the left side and the right side can respectively roll back and forth in the left rail and the right rail, the rear clamping device is limited to move up and down, left and right through the composite rollers I, and the fact that the front and back movement of the rear clamping device is driven to move smoothly when the telescopic cylinder A stretches back and forth is ensured.
The technical scheme is further limited, the pressing device comprises pressing plate arms arranged on the left and right sides, a pressing plate arranged on the upper portion of each pressing plate arm, a pin shaft, a pressing oil cylinder, a pressing plate torsion spring and a hinge pin shaft, wherein the pressing plate arms are hinged with the pressing plate; the pressing plate arm is hinged to a support of the rear clamping device through a pressing plate arm pin shaft and can rotate around the axis line of the pressing plate arm pin shaft; the oil cylinder head of the pressing oil cylinder is hinged with a hole in the middle upper part of the pressing plate arm through a hinge pin shaft, the tail part of an oil cylinder barrel of the pressing oil cylinder is hinged and connected to a pressing plate oil cylinder tail support of the rear clamping device through a pressing plate oil cylinder tail pin shaft, the pressing oil cylinders are symmetrically arranged in 1 group at the left and right sides, and a pressing piston rod of the pressing oil cylinder drives the pressing plate arm to rotate around the axial lead of the pressing plate arm pin shaft when stretching;
the pressing plate arm is hinged with the pressing plate through a pin shaft and gives a certain torque force to the pressing plate through a pressing plate torsion spring;
the contact surface of the pressure plate and the tire is an arc surface;
the rear clamping body of the rear clamping device is provided with a large arc surface and is used for adapting to the arc surfaces of tires of aircraft landing gears of different models so as to ensure that the clamping wheel mechanism is in good contact when clamping tires of different diameters.
The technical scheme is further limited, the lifting device comprises lifting oil cylinders arranged at four angular positions on the left and right outer sides of the frame assembly, lifting oil cylinder heads of the lifting oil cylinders are respectively hinged with upper mounting holes of a C-shaped stand column I and a C-shaped stand column II welded on the left and right sides of the frame assembly through lifting oil cylinder pin shafts, and the lifting oil cylinders can rotate around the axis lines of the lifting oil cylinder pin shafts; the upper end of the lifting oil cylinder inclines to the center of the wheel clasping mechanism by a certain angle so as to provide upward supporting force for the wheel clasping mechanism as a whole and provide certain component force to the center from the left side and the right side respectively, so that the lifting oil cylinder can automatically return to the center when the two sides of the wheel clasping mechanism are stressed unevenly, and the lifting oil cylinder inclines to the center and can prevent the lifting oil cylinder from inclining outwards to cause side turning when one side of the wheel clasping mechanism is stressed excessively; the lower part of a cylinder barrel of the lifting oil cylinder is hinged to the body of the tractor through a lower pin shaft of the lifting oil cylinder, and the wheel clasping mechanism is integrally supported by four lifting oil cylinders of the lifting device;
lifting oil cylinders arranged at four corners of the wheel clasping mechanism act simultaneously to realize integral lifting and descending of the frame assembly, and the lifting oil cylinders are connected in parallel through oil inlet paths and oil return paths to realize automatic lifting or descending according to the height change of tires of the aircraft landing gear to form a new stress balance state so as to avoid torsion damage to the landing gear caused by the wheel clasping mechanism.
The technical scheme is further limited, the guide limiting device comprises four C-shaped channel steel guide rails fixed on the body of the tractor, and the positions of the C-shaped channel steel guide rails correspond to the position II of the composite roller of the frame assembly to ensure that the composite roller II rolls smoothly up and down in the C-shaped channel steel guide rails; when the lifting device lifts or puts down the frame assembly, the position of the composite idler wheel II in the front-back direction and the left-right direction is limited through the inner side surface of the C-shaped channel steel guide rail, so that the integral action limitation of the wheel clasping mechanism is realized; the composite rollers II on the outer side face of the frame assembly can be arranged in a group up and down singly or in multiple numbers in the corresponding C-shaped channel steel guide rails;
the lifting device and the guide limiting device act together to realize automatic adaptive protection and limiting protection of up-and-down movement and left-and-right tilting movement of the frame assembly.
The technical scheme is further limited, the hydraulic system mainly provides power and control for each motion unit of the wheel clasping mechanism and comprises a telescopic oil cylinder A, a telescopic oil cylinder B, a telescopic oil cylinder C, a left turnover cylinder, a left self-locking cylinder, a right turnover cylinder, a right self-locking cylinder, a pressing oil cylinder, four lifting oil cylinders, a hydraulic power unit, a hydraulic control valve and a hydraulic energy accumulator.
The technical proposal is further limited, the safety control system comprises a pressure sensor for monitoring the energy accumulator, a pressure sensor A arranged at an oil inlet of the lifting oil cylinder, a pressure sensor B arranged at an oil inlet of the pressing oil cylinder, a left approach switch arranged at the extending position of a left locking piston rod of a left self-locking cylinder of the front left clamping device, and a left angle sensor I of the axle center of a left turning eccentric wheel, the left angle sensor II is arranged on the upper portion of a left large arm main shaft of the left telescopic large arm and used for detecting the left angle of the left telescopic large arm and the front left clamping device, and the right angle sensor II is arranged on the upper portion of a right large arm main shaft of the right telescopic large arm and used for detecting the angle of the right telescopic large arm and the front right clamping device.
Compared with the prior art, the invention has the advantages that:
1. the scheme discloses a wheel embracing mechanism of an aircraft tractor, which is used for embracing and lifting tires of an undercarriage when the tractor is in butt joint with the undercarriage of the aircraft, the wheel embracing mechanism is arranged at the middle position of the tractor, lifting oil cylinders arranged at four corners of the wheel embracing mechanism are adopted to realize the integral lifting and lowering of the wheel embracing mechanism, when the tractor turns, the left and right tires of the undercarriage are subjected to height change to cause the pressure increase of a certain side or a certain direction of the wheel embracing mechanism, oil inlet oil paths and oil return oil paths of the four lifting oil cylinders are connected in parallel, hydraulic cylinders with increased stress automatically descend, other hydraulic cylinders automatically ascend to form a new stress balance state, the compensation requirement of the height change of the diameters of tires of different types can be met, and the torsion injury of the wheel embracing mechanism;
2. according to the scheme, the front left/right clamping device of the wheel clamping mechanism adopts the swing mechanism and the turnover mechanism based on the connecting rod principle, so that the horizontal occupied area is fully reduced, and the overall dimension of the tractor is reduced;
3. according to the scheme, the front left/right clamping device and the rear clamping device of the wheel embracing mechanism adopt telescopic mechanisms, so that the whole front and rear movement of the wheel embracing mechanism can be realized, and the gravity center point of the aircraft undercarriage is adjusted to the movement center position of the tractor so as to balance the stress of each wheel of the tractor;
4. the wheel clasping mechanism in the scheme has reasonable stress and simple and convenient operation, can fully protect the aircraft landing gear, is convenient for realizing automatic operation control, and is suitable for clasping and clamping tires of the aircraft landing gear with different sizes in a certain range.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a first schematic structural view of a frame assembly according to the present invention;
FIG. 3 is a second schematic structural view of a frame assembly according to the present invention;
FIG. 4 is a third schematic structural view of a frame assembly according to the present invention;
FIG. 5 is a fourth schematic structural view of a frame assembly according to the present invention;
FIG. 6 is a schematic structural view of the left and right telescopic booms of the present invention;
FIG. 7 is a first schematic structural view of the front left clasping device of the present invention;
FIG. 8 is a second schematic structural view of the front left clasping device of the present invention;
FIG. 9 is a third schematic structural view of the front left clasping device of the present invention;
FIG. 10 is a perspective view of the open structure of the front left clasping device in the present invention;
FIG. 11 is a top view of the open structure of the front left clasping device in the present invention;
FIG. 12 is a side view of the closing mechanism of the front left clasping device of the present invention;
FIG. 13 is a top view of a closing mechanism of the front left clasping device of the present invention;
FIG. 14 is a first schematic structural view of a front right clasping device of the present invention;
FIG. 15 is a second schematic structural view of the front right clasping device in the present invention;
FIG. 16 is a third schematic structural view of a front right clasping device in the present invention;
FIG. 17 is a perspective view of the front right clasping device of the present invention in an open configuration;
FIG. 18 is a top view of the open configuration of the front right clasping device of the present invention;
FIG. 19 is a schematic view of a front left clamping device and a front right clamping device according to the present invention;
FIG. 20 is a sequence diagram illustrating the progressive opening of the front left and right clamping devices of the present invention;
FIG. 21 is a sequence diagram illustrating the progressive closing of the front left clasping device and the front right clasping device in the present invention;
FIG. 22 is a first schematic structural view of a rear clamping device according to the present invention;
FIG. 23 is a second schematic structural view of a rear clamping device according to the present invention;
FIG. 24 is a third schematic structural view of a rear clamping device according to the present invention;
FIG. 25 is a fourth schematic structural view of the rear clamping device of the present invention;
FIG. 26 is a schematic view of the construction of the pressing device of the present invention;
FIG. 27 is a view showing a dangerous working condition without a torsion spring in the pressing device of the present invention;
FIG. 28 is a diagram illustrating the safe operation of the present invention with a torsion spring in the hold down device;
fig. 29 is a schematic structural view of a hoisting device in the invention;
FIG. 30 is a schematic view of the guide limiting device synchronously lifting along with the lifting device in the present invention;
FIG. 31 is a diagram of a state in which a guiding and limiting device automatically adjusts the stress balance according to the change of the height of a tire along with a lifting device according to the present invention;
FIG. 32 is a schematic view of the synchronous lifting of the lifting device of the present invention
FIG. 33 is a diagram of the lifting device of the present invention automatically adjusting the stress balance according to the variation of the height of the tire
FIG. 34 is a schematic view of the guiding and limiting device of the present invention;
FIG. 35 is a schematic diagram of the hydraulic system and control system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements" does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Referring to fig. 1-35, embodiments of the present invention are described in detail.
Example 1:
orientation definition: the human stands at the tail of the tractor, the front direction of the human stands in front of the aircraft landing gear, and the left-hand direction stands in the left-hand direction and the right-hand direction stands in the back of the aircraft landing gear. As described with reference to fig. 1. The overall structure is as follows:
a embrace wheel mechanism for aircraft tractor, including embracing wheel mechanism 01, embrace wheel mechanism 01 and arrange in the intermediate position of tractor 02, embrace wheel mechanism 01 and embrace clamping device 200, preceding right side by frame assembly 100, preceding left side and embrace clamping device 300, embrace clamping device 400, closing device 500, play to rise device 600, direction stop device 700, hydraulic system 800, safety control system 900, the flexible big arm 1000 in a left side, the flexible big arm 1100 in the right side constitutes for embrace and press from both sides tightly tire 05 to aircraft undercarriage 04.
The frame assembly 100 is of a C-shaped layout structure with a front opening, the left side and the right side of the frame assembly 100 are respectively provided with a left telescopic big arm 1000 and a right telescopic big arm 1100 in a horizontal sliding mode, the front end of the left telescopic big arm 1000 is hinged with a front left holding and clamping device 200, the front end of the right telescopic big arm 1100 is hinged with a front right holding and clamping device 300, the rear holding and clamping device 400 is arranged at the rear part of the frame assembly 100, and the pressing device 500 is arranged at the upper end part of the rear holding and clamping device 400;
when the left telescopic large arm 1000 and the right telescopic large arm 1100 synchronously act through the hydraulic system 800, the front left holding device 200 and the front right holding device 300 can be driven to synchronously move back and forth and horizontally and vertically rotate inwards relative to the corresponding telescopic large arms to hold the tire 05 of the aircraft landing gear 04, and the rear holding device 400 moves back and forth through the hydraulic system 800 and presses the tire 05 of the aircraft landing gear 04 through the pressing device 500; the synchronous forward and backward movement adjustment of the front left clamping device 200, the front right clamping device 300 and the rear clamping device 400 enables the tire 05 of the aircraft landing gear 04 to be located at the front and rear central position of the tractor 02 and realizes the automatic approaching and optimal contact of the tire 05 of the aircraft landing gear 04;
four corners of two sides of the frame assembly 100 are connected with a tractor body 03 of a tractor 02 through a lifting device 600, the lifting device 600 synchronously acts to realize integral lifting and descending of the frame assembly 100, and meanwhile, the lifting device 600 can automatically lift or descend according to height change of tires 05 of an aircraft undercarriage 04 to form a new stress balance state so as to avoid torsion damage to the undercarriage 04 caused by a wheel clasping mechanism 01;
the guiding and limiting device 700 is arranged between the side part of the frame assembly 100 and the vehicle body 03 of the tractor 02 and can limit the position of the frame assembly 100 in the front-back direction and the left-right direction according to the lifting or lowering of the frame assembly 100 by the lifting device 600.
Example 2:
the frame assembly 100 comprises a frame left part 110, a frame right part 120 and a rectangular cross beam 101, wherein the rectangular cross beam 101 connects the frame left part 110 and the frame right part 120 together, and the connecting part is reinforced by a reinforcing rib plate I1021 and a reinforcing rib plate II 1022; the left side and the right side of the upper portion of the rectangular cross beam 101 are connected with telescopic oil cylinders A801 and are provided with rear seats A103 used for installing the telescopic oil cylinders A801, the rear ends of the telescopic oil cylinders A801 are connected with the rear seats A103 in the horizontal direction through pin shafts A104, and meanwhile the telescopic oil cylinders A801 can swing up and down around the axis line of the rear seats A103.
As shown in fig. 2, 3, 4 and 5:
the frame left part 110 and the frame right part 120 have the same structure and are in a left-right symmetrical junction; the left part 110 of the frame is formed by welding a rectangular crossbeam a111, C-shaped channel steel 112, a transverse reinforcing beam 113 and a C-shaped reinforcing plate 114; the outer side of the rectangular girder a111 is welded with a C-shaped upright I115 and a C-shaped upright II 116, the C-shaped upright I115 is vertically welded on the outer side of the front end of the C-shaped channel steel 112, and the C-shaped upright II 116 is vertically welded on the outer side of the rear part of the rectangular girder a 111; the upper part of the rectangular girder a (111) is provided with a telescopic oil cylinder B802, the rear part of the upper part of the rectangular girder a111 is provided with a rear seat B117 connected with the rear end of the telescopic oil cylinder B802, the rear end of the telescopic oil cylinder B802 is connected with the rear seat B117 through a pin shaft B105, and meanwhile, the telescopic oil cylinder B802 can swing up and down around the axis line of the rear seat B117; a telescopic oil cylinder C803 is arranged at the upper part of the C-shaped channel steel 112, a rear seat C118 is welded at the upper part of the C-shaped channel steel 112, the rear end of the telescopic oil cylinder C803 is connected with the rear seat C118 in the vertical direction through a pin shaft C106, and meanwhile, the telescopic oil cylinder C803 can swing left and right in the horizontal direction around the axial lead of the rear seat C118; a gap K is formed in one side, close to the telescopic oil cylinder C803, of the C-shaped upright post I115, so that a swinging space is reserved for the telescopic oil cylinder C803 to swing left and right in the horizontal direction around the axis line of the rear seat C118; a composite roller II 109 is arranged on the lower side of the front part of the C-shaped upright post I115 and the lower side of the rear part of the C-shaped upright post II 116, and at least 2 composite rollers I108 which are horizontally arranged are arranged on the inner side of the rectangular girder a111 in the horizontal direction; the rectangular girder a111 is in a rectangular steel pipe structure, and guide sliders 107 are arranged on the horizontal plane and the vertical plane inside the front end of the rectangular girder a.
Example 3:
the left telescopic big arm 1000 and the right telescopic big arm 1100 are in a left-right symmetrical structure;
as shown in fig. 6, the rear part of the left telescopic boom 1000 is a left rectangular cylinder 1001, and four planes near the end part of the left telescopic boom 1000 are provided with left guide sliders 1004, the left head 1002 of the left telescopic boom 1000 is of a semicircular structure and is provided with a mounting hole for mounting a left boom spindle 1003, the left boom spindle 1003 connects the left telescopic boom 1000 and the front left clasping device 200 together, the front left clasping device 200 can horizontally rotate around the central axis of the left boom spindle 1003, and meanwhile, the head part of the telescopic cylinder a801 is provided with a mounting hole and is connected to the upper part of the left boom spindle 1003; the left rectangular column 1001 at the rear part of the left telescopic big arm 1000 is arranged in an inner hole of a rectangular girder a (111) of the frame left part 110, and the left telescopic big arm 1000 is limited to move up and down, left and right through a left guide slide block 1004 and a guide slide block 107 in the inner hole of the rectangular girder a (111) so as to achieve the function that the left telescopic big arm 1000 can only stretch back and forth; a left composite roller 1005 is mounted on the outer side of the left head 1002 of the left telescopic boom 1000, and when the left telescopic boom 1000 is telescopic back and forth, the left composite roller 1005 rolls in the track of the C-shaped channel steel 112 of the frame assembly 100 to ensure that the left telescopic boom 1000 is well stressed;
the rear part of the right telescopic boom 1100 is a right rectangular cylinder 1101, four planes near the end part of the right telescopic boom are provided with right guide sliding blocks 1104, the right head 1102 of the right telescopic boom 1100 is of a semicircular structure and is provided with a mounting hole for mounting a right boom spindle 1103, the right boom spindle 1103 connects the right telescopic boom 1100 with the front right clamping device 300, the front left clamping device 200 can rotate around the central axis of the right boom spindle 1103, and meanwhile, the head part of a telescopic oil cylinder A801 on the right side of the frame assembly 100 is provided with a mounting hole and is connected with the upper part of the right boom spindle 1103; a right rectangular column 1101 at the rear part of the right telescopic big arm 1100 is arranged in an inner hole of a rectangular girder a (111) of the frame right part 120, and a right guide slide block 1104 at the rear part of the right telescopic big arm 1100 and a guide slide block 107 in the inner hole of the rectangular girder a (111) are combined to limit the up-down and left-right movement of the right telescopic big arm 1100 so as to achieve the function that the right telescopic big arm 1100 can only stretch back and forth; the right composite roller 1105 is installed on the outer side of the right head 1102 of the right telescopic boom 1100, and when the right telescopic boom 1100 is extended back and forth, the right composite roller 1105 on the right telescopic boom rolls in the track of the C-shaped channel steel 112 on the right side of the frame assembly 100 to ensure that the right telescopic boom 1100 is well stressed.
Example 4:
the front left clamping device 200 and the front right clamping device 300 have the same structure and are symmetrical left and right;
as shown in fig. 7-13, the front left clamping device 200 is mounted at the front part of the left telescopic boom 1000 and is hinged through a left boom main shaft 1003 so that the front left clamping device 200 can rotate around the axis of the left boom main shaft 1003; the front left clamping device 200 comprises a left clamping frame 201, a left clamping lower seat 202, a left turning cylinder 203, a left turning eccentric wheel 204, a left lining 205, a left self-locking cylinder 206, a left guide sleeve 207, a left bearing 208 and a left end face bearing 209; the left holding frame 201 is of an integral structure welded or cast in a frame mode, the left side of the left holding frame 201 is provided with an upper left mounting seat 210 and a lower left mounting seat 211, and the upper left mounting seat 210 and the lower left mounting seat 211 are provided with a left mounting hole 212 for a left large arm spindle 1003 to pass through; the left upper mounting seat 210 and the left lower mounting seat 211 are mounted at the head of the left big arm spindle 1003 through a left end bearing 209, and the left end bearing 209 transmits the gravity borne by the left clamping device 200 to the left telescopic big arm 1000; the left holding clamp lower seat 202 is hinged to a left side hole I213 on the left lower side of the left holding clamp frame 201 through a left bushing 205 and a left turning eccentric wheel 204, the left holding clamp lower seat 202 is hinged to a right side hole I214 on the right lower side of the left holding clamp frame 201 through a left bushing 205 and a left guide sleeve 207, and the left side hole I213 and the right side hole I214 are designed coaxially and used for ensuring that the left holding clamp lower seat 202 can rotate around the axial lead of the left holding clamp lower seat; the upper part of the left turning cylinder 203 is hinged with a left upper beam 215 of the left holding clamp frame 201 through a left cylinder seat 216, the lower part of the left turning cylinder 203 is hinged with a left turning eccentric wheel 204, and a left piston rod 2031 of the left turning cylinder 203 can drive the left turning eccentric wheel 204 to rotate around a left axial lead 217 of a left hole I213 and a right hole I214 through telescopic action and realize the up-and-down turning of the left holding clamp lower seat 202; the left overturning eccentric wheel 204 is connected with the left clamp lower seat 202 through a left bolt 218;
the rotation action of the front left clamping device 200 adopts a connecting rod principle: a left hinge mounting hole 219 is formed in the upper left mounting seat 210 of the left holding and clamping frame 201, and the left hinge mounting hole 219 is hinged to the head of the telescopic cylinder C803 through a left hinge shaft 220; the flexible direction of the flexible hydro-cylinder B802 of frame assembly 100 left side is parallel with the flexible direction of the big arm 1000 of left side flexible, the left side outside of flexible hydro-cylinder B802 is arranged in to the flexible hydro-cylinder C803 of frame assembly 100 left side, left side articulated mounting hole 219 is in the left side outside and the partial front side of the left axial lead 217 direction of left side hole I213 and right side hole I214.
As shown in fig. 14-18, the front right clamping device 300 is mounted at the front of the right telescopic boom 1100 and is hinged by the right boom main shaft 1103, and the front right clamping device 300 can rotate around the axis of the right boom main shaft 1103; the front right clamping device 300 comprises a right clamping frame 301, a right clamping lower seat 202, a right overturning cylinder 303, a right overturning eccentric wheel 304, a right bushing 305, a right self-locking cylinder 306, a right guide sleeve 307, a right bearing 308 and a right end face bearing 309; the right holding frame 301 is of an integral structure welded or cast in a frame mode, a right upper mounting seat 310 and a right lower mounting seat 311 are arranged on the right side of the right holding frame 301, and a right mounting hole 312 for a right large-arm spindle 1103 to pass through is formed in the right upper mounting seat 310 and the right lower mounting seat 311; the right upper mounting seat 310 and the right lower mounting seat 311 are mounted at the head of the right telescopic boom 1100 through a right end face bearing 309, and the right end face bearing 309 transmits the gravity borne by the right clamping device 300 to the right telescopic boom 1100; the right holding clamp lower seat 302 is hinged with a right hole II 313 on the lower right side of the right holding clamp frame 301 through a right bushing 305 and a right turning eccentric wheel 304; the right holding clamp lower seat 302 is hinged with a left hole II 314 on the left lower side of the right holding clamp frame 301 through a right bushing 305 and a right guide sleeve 307, and meanwhile, the right hole II 313 and the left hole II 314 are designed coaxially and are used for ensuring that the right holding clamp lower seat 302 can rotate around the axial lead of the right holding clamp lower seat; the upper part of the right turning cylinder 303 is hinged with a right upper cross beam 315 of the right holding clamp frame 301 through a right cylinder base 316, the lower part of the right turning cylinder 303 is hinged with a right turning eccentric wheel 304, and a right piston rod 3031 of the right turning cylinder 303 can drive the right turning eccentric wheel 304 to rotate around a right axial lead 317 of a right hole II 313 and a left hole II 314 through telescopic action and further realize the up-and-down turning of the right holding clamp lower base 302; the right overturning eccentric wheel 304 is connected with the right clamp lower seat 302 through a right bolt 318;
the rotation action of the front right clamping device 300 adopts a connecting rod principle: a right hinge mounting hole 319 is formed in the right upper mounting seat 310 of the right holding clamp frame 301 and is hinged to the head of the telescopic cylinder C803 through a right hinge shaft 320; the telescopic direction of the telescopic cylinder B802 on the right side of the frame assembly 100 is parallel to the telescopic direction of the right telescopic boom 1100, the telescopic cylinder C803 on the right side of the frame assembly 100 is arranged on the right outer side of the right telescopic cylinder B802, and the right hinge mounting hole 319 is arranged on the right outer side of the right hole II 313 and the right axial lead 317 direction of the left hole II 314 and is deviated to the front side;
as shown in fig. 19, the left locking cylinder 206 is arranged at the upper part of the front left clasping device 200, and the tail part of the left locking cylinder 206 is hinged with the left cylinder seat 221 at the inner side of the upper beam of the left clasping frame 201; when the left clamping device 200 and the right clamping device 300 are locked in a closed manner, the left locking piston rod 2061 of the left locking cylinder 206 penetrates through a hole in the middle of the left bushing 205 to extend out, so that the left clamping device 200 and the front right clamping device 300 are connected in series for locking;
the right locking cylinder 306 is arranged at the lower part of the front right clamping device 300, the tail part of the right locking cylinder 306 is hinged with the right cylinder seat 320 on the inner side of the lower beam of the right clamping frame 301, and when the front left clamping device 200 and the front right clamping device 300 are closed and locked, the right locking piston rod 3061 of the right locking cylinder 306 penetrates through a hole in the middle of the right guide sleeve 307 and the left guide sleeve 207 of the left clamping frame 201 to connect the left clamping frame 201 and the left clamping frame 301 in series to realize locking.
Further, the left turning cylinder 203, the left self-locking cylinder 206, the right turning cylinder 303, the right self-locking cylinder 306 and the telescopic oil cylinder C803 may be hydraulic cylinders or electric cylinders according to the convenience of the control system.
The front left clamping device 200 has the following action modes: as shown in figure 20 of the drawings,
opening of the front left clasping device 200: when the telescopic cylinder B802 retracts, the left telescopic boom 1000 is driven to retract, the left clamping lower seat 202 is turned downwards to be in a horizontal state, and when the telescopic cylinder B802 retracts completely, the telescopic cylinder C803 also retracts completely and pushes the left clamping device 200 to rotate around the left axial lead 217 until the front left clamping device 200 is just positioned at a position vertical to the left telescopic boom 1000. Through design calculation, when the telescopic cylinder B802 is completely retracted, the left clamping device 200 is exactly located at a position perpendicular to the telescopic direction of the left telescopic boom 1000. When the telescopic oil cylinder B802 extends forwards, the telescopic oil cylinder C803 extends synchronously with the telescopic oil cylinder B802 within a certain stroke, and the left clamping device 200 is kept just at the position vertical to the left telescopic boom 1000 and moves forwards in parallel; the left shaft axis 217 of the telescopic oil cylinder B802 can only move back and forth because the left telescopic big arm 1000 is limited in left-right and up-down movement and the left telescopic big arm 1000 can only move back and forth, when the telescopic oil cylinder C803 is completely extended out, the telescopic oil cylinder B802 continues to extend forwards, and when the left shaft axis 217 moves forwards, the hinge mounting hole 219 rotates around the center thereof to drive the front left clasping device 200 to be gradually opened from a position vertical to the left telescopic big arm 1000; when the telescopic cylinder B802 is fully extended, the left clasping device 200 is fully opened and is in a position parallel to the left telescopic boom 1000.
Closing of the front left clasping device 200: as shown in fig. 21, the closing operation direction and sequence of the front left clasping device 200 are completely opposite to the opening operation direction and sequence, and will not be described in detail here.
Locking of the front left clamping device 200: when the front left clamping device 200 and the right clamping device 300 are opened, the left locking piston rod 2061 of the left self-locking cylinder 206 of the front left clamping device 200 is completely retracted, and at this time, the front left clamping device 200 is disengaged from the front right clamping device 300; when the front left clamping device 200 and the front right clamping device 300 are closed, the left locking piston rod 2061 of the rear left locking cylinder 206 extends out, and the left clamping frame 201 of the front left clamping device 200 and the right clamping frame 301 of the front right clamping device 300 are serially connected and locked together by the right locking piston rod 3061.
The operation manner and sequence of the front right clamping device 300 and the front left clamping device 200 are bilaterally symmetrical, and will not be described in detail.
Example 5:
as shown in fig. 22-25, the rear clamp device 400 is provided with a welded rear clamp body 410, the rear clamp body 410 is formed by welding a bucket 411, a left rail 412, a right rail 413 and a cross beam 414 into a whole, the left rail 412 is welded at a front-rear-up-down central position on the left side of the bucket 411, the right rail 413 is welded at a front-rear-up-down central position on the right side of the bucket 411, a support 415 for mounting a press plate arm 501 of a pressing device 500 is welded at the upper part of the bucket 411, and the cross beam 414 is welded at the rear part of the bucket 411 and is reinforced and welded together through the cross beam 414, the bucket 411, the left rail 412 and the right rail 413 so as to bear; the supports 415 are respectively arranged on the left and the right of the upper part of the bucket 411 and are provided with press plate arm pin shafts 401, the two press plate arm pin shafts 401 are coaxially arranged, and the press plate arms 501 can rotate around the axial lead of the press plate arm pin shafts 401; a platen oil cylinder tail support 416 is welded to the upper rear portion of the cross beam 414, the platen oil cylinder tail supports 416 are respectively arranged at left and right symmetrical positions, a platen oil cylinder tail pin 402 is installed in a mounting hole of the platen oil cylinder tail support 416, the tail portion of the platen oil cylinder 804 is hinged to the platen oil cylinder tail pin 402, the two platen oil cylinder tail pin 402 are coaxially arranged, and the platen oil cylinder 804 can rotate around the axial lead of the platen oil cylinder tail pin 402; the left side and the right side of the bucket 411 are provided with hinged mounting holes for telescopic oil cylinders A (801), a telescopic oil cylinder hinged front pin shaft 403 is mounted in the mounting holes, the two telescopic oil cylinders hinged front pin shafts 403 are coaxially arranged, and the telescopic oil cylinders A (801) can rotate around the axial lead of the telescopic oil cylinder hinged front pin shaft 403.
The left rail 412 and the right rail 413 of the rear clamping device 400 are respectively butted with the composite rollers I108 on the inner sides of the left and right rectangular girders a111 of the frame assembly 100, the composite rollers I108 on the left and right sides can respectively roll back and forth in the left rail 412 and the right rail 413, the rear clamping device 400 is limited to move up and down and left and right by the composite rollers I108, and the rear clamping device 400 is driven to move back and forth smoothly when the telescopic cylinder A801 extends back and forth.
Example 6:
as shown in fig. 26, the pressing device 500 includes a pressing plate arm 501 arranged left and right, a pressing plate 502 mounted on the upper portion of the pressing plate arm 501, a pin 503 hinged to the pressing plate 502 by the pressing plate arm 501, a pressing cylinder 804, a pressing plate torsion spring 504, and a hinge pin 505; the pressing plate arm 501 is hinged to a support 415 of the rear clamping device 400 by a pressing plate arm pin 401 and can rotate around the axis line of the pressing plate arm pin 401; an oil cylinder head 8041 of the pressing oil cylinder 804 is hinged with a hole in the middle upper part of the pressing plate arm 501 through a hinge pin shaft 505, the tail part of an oil cylinder barrel 8042 of the pressing oil cylinder 804 is hinged and connected to a pressing plate oil cylinder tail support 416 of the rear clamping device 400 through a pressing plate oil cylinder tail pin shaft 402, the pressing oil cylinders 804 are symmetrically arranged in 1 group in a left-right mode, and a pressing piston rod 8043 of the pressing oil cylinder 804 drives the pressing plate arm 501 to rotate around the axis line of the pressing plate arm pin shaft 401 when stretching;
the pressing plate arm 501 is hinged to the pressing plate 502 through a pin 503, and a certain torsion force is provided for the pressing plate 502 through a pressing plate torsion spring 504, so that when the pressing plate arm 501 turns backwards, after the pressing plate 502 turns backwards around the axis of the pin 503, and when the pressing plate arm 501 turns forwards to be close to and press the tire, the pressing plate 502 is in a backwards-turning state to cause damage to the tire 05 of the aircraft landing gear and cause major accidents, such as a dangerous operation condition shown in fig. 27, and as shown in fig. 28, safe operation guaranteed by the pressing plate torsion spring 504 is achieved.
Further, the contact surface of the pressing plate 502 and the tire 05 is a circular arc surface, so that the contact surface and the periphery of the pressing plate 502 and the tire 05 are enlarged as much as possible to form a fillet, friction is increased, and the tire is prevented from being damaged by local extrusion.
The rear holding body 410 of the rear holding device 400 is provided with a large arc surface for adapting to arc surfaces of tires 05 of aircraft landing gears of different models to ensure that the holding wheel mechanism is in good contact when holding tires of different diameters.
Example 7:
as shown in fig. 29, the lifting device 600 includes lifting cylinders 805 arranged at four angular positions on the left and right outer sides of the frame assembly 100, a lifting cylinder head 8051 of the lifting cylinder 805 is hinged to upper mounting holes of a C-shaped upright i 115 and a C-shaped upright ii 116 welded to the left and right sides of the frame assembly 100 through lifting cylinder pins 601, respectively, and the lifting cylinder 805 can rotate around the axial line of the lifting cylinder pins 601; the upper end of the lifting oil cylinder 805 inclines to the center of the wheel clasping mechanism 01 by a certain angle so as to provide upward supporting force for the wheel clasping mechanism 01 as a whole and provide certain component force towards the center from the left side and the right side respectively, so that the lifting oil cylinder 805 can automatically return to the center when the two sides of the wheel clasping mechanism 01 are stressed unevenly, and the lifting oil cylinder 805 inclines to the center and can prevent the lifting oil cylinder from inclining outwards to cause side turning when the single side of the wheel clasping mechanism 01 is stressed excessively; the lower portion 8052 of the cylinder barrel of the lifting oil cylinder 805 is hinged to the body 03 of the tractor 02 through a lower pin shaft 602 of the lifting oil cylinder, and the wheel embracing mechanism 01 is integrally supported by the four lifting oil cylinders 805 of the lifting device 600.
The lifting oil cylinders 805 arranged at four corners of the wheel clasping mechanism 01 act simultaneously to realize integral lifting and descending of the frame assembly 100, and when the lifting oil cylinders 805 act simultaneously to lift the frame assembly 100, the lifting oil cylinders stop reaching the height requirement and do not lift to the top, and a certain stroke is reserved; when the tractor 02 grips and lifts the tire 05 to steer, the left tire 05 and the right tire 05 of the aircraft landing gear 04 change in height, which causes the pressure on one side or one direction of the wheel clasping mechanism 01 to increase, at this time, the lifting oil cylinders 805 are connected in parallel through the oil inlets 805a and the oil return 805b, so that the aircraft landing gear 04 automatically ascends or descends according to the change in height of the tire 05 of the aircraft landing gear 04 to form a new stress balance state, and the wheel clasping mechanism 01 is prevented from causing torsional damage to the landing gear 04, as shown in fig. 31 and 33.
Example 8:
as shown in fig. 34, the guiding and limiting device 700 includes four C-shaped channel steel guide rails 701 fixed on the body 03 of the tractor 02, and the positions of the C-shaped channel steel guide rails 701 correspond to the positions of the compound rollers ii 109 of the frame assembly 100, so as to ensure that the compound rollers ii 109 smoothly roll up and down in the C-shaped channel steel guide rails 701; when the lifting device 600 lifts or lowers the frame assembly 100, the position of the compound roller 109 ii in the front-back and left-right directions is limited by the inner side surface of the C-shaped channel steel guide rail 701, so that the overall action of the wheel clasping mechanism 01 is limited.
Further, in order to improve the bearing capacity of the guiding and limiting device, the composite rollers ii 109 on the outer side surface of the frame assembly 100 may be arranged singly or in a group of a plurality of rollers arranged above and below in the corresponding C-shaped channel steel guide rails 701.
The lifting device 600 and the guide limiting device 700 work together to realize automatic adaptive protection and limiting protection of up-and-down movement and left-and-right tilting movement of the frame assembly 100. As shown in fig. 30 and 31.
Example 9:
the hydraulic system 800 mainly provides power and control for each motion unit of the wheel clasping mechanism 01, and comprises a telescopic oil cylinder A (801), a telescopic oil cylinder B802, a telescopic oil cylinder C803, a left overturning cylinder 203, a left self-locking cylinder 206, a right overturning cylinder 303, a right self-locking cylinder 306, a pressing oil cylinder 804, four lifting oil cylinders 805, a hydraulic power unit 806, a hydraulic control valve 807 and a hydraulic accumulator 808. The hydraulic power unit 806 may be implemented by a commercially available hydraulic pump station unit or other similar products, the hydraulic control valve 807 is implemented by a commercially available integrated hydraulic proportional control valve, and the hydraulic accumulator 808 may be implemented by a commercially available product for maintaining hydraulic pressure, which will not be described in further detail herein.
Example 10:
the safety control system 900 comprises a pressure sensor 901 for monitoring an energy accumulator 808, a pressure sensor A902 arranged at an oil inlet 805a of a lifting oil cylinder 805, a pressure sensor B903 arranged at an oil inlet of a pressing oil cylinder 804, a left proximity switch 904 arranged at the extending position of a left locking piston rod 2061 of a left self-locking cylinder 206 of the front left clamping device 200, a left angle sensor I905 arranged at the axis of a left turning eccentric wheel 204, a right proximity switch 906 of the extending position of a right locking piston rod 3061 of a right locking cylinder 306 of the front right clamping device 300, a right angle sensor I907 of the axle center of the right turning eccentric wheel 304, an angle sensor II 908 which is arranged on the upper part of a left boom main shaft 1003 of the left telescopic boom 1000 and is used for detecting the left angle of the left telescopic boom 1000 and the front left clamping device 200, and a right angle sensor 909 which is arranged on the upper part of a right boom main shaft 1103 of the right telescopic boom 1100 and is used for detecting the angle of the right telescopic boom 1000 and the front right clamping device 200.
This embrace wheel mechanism's function has: when the left telescopic oil cylinder B802 and the right telescopic oil cylinder C803 synchronously act, the front left clamping device 200 and the front right clamping device 300 can be driven to synchronously move back and forth, and the synchronous expansion of the left telescopic oil cylinder A801 can drive the rear clamping device 400 to move back and forth; when the tire 05 of the aircraft landing gear 04 is not located at the front-rear center position of the tractor 02, the front left clamping device 200, the front right clamping device 300 and the rear clamping device 400 can be adjusted in a front-rear movement mode to achieve automatic approaching and optimal contact of the aircraft tire, and damage to the tire 05 caused by independent movement of the front left clamping device 200, the front right clamping device 300 and the rear clamping device 400 is avoided; after the tire 05 is clasped and clamped by the clasping wheel mechanism 01, the front left clasping device 200, the front right clasping device 300 and the rear clasping device 400 are synchronously moved, and the tire 05 can be adjusted to the position of the vehicle body motion center of the tractor; the aircraft undercarriage can automatically ascend or descend according to the height change of tires of the aircraft undercarriage to form a new stress balance state, so that torsion damage to the undercarriage caused by the wheel clasping mechanism is avoided. The wheel clasping mechanism has reasonable stress and simple and convenient operation, can fully protect the aircraft landing gear, is convenient for realizing automatic operation control, and is suitable for clasping and clamping tires of the aircraft landing gear with different sizes in a certain range.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A embrace wheel mechanism for aircraft tractor, including embracing wheel mechanism (01), its characterized in that: the wheel embracing mechanism (01) is arranged in the middle of a tractor (02), and the wheel embracing mechanism (01) consists of a frame assembly (100), a front left embracing clamp device (200), a front right embracing clamp device (300), a rear embracing clamp device (400), a pressing device (500), a lifting device (600), a guiding and limiting device (700), a hydraulic system (800), a safety control system (900), a left telescopic big arm (1000) and a right telescopic big arm (1100);
the frame assembly (100) is of a C-shaped layout structure with a front opening, the left side and the right side of the frame assembly (100) are respectively provided with a left telescopic large arm (1000) and a right telescopic large arm (1100) in a horizontal sliding mode, the front end of the left telescopic large arm (1000) is hinged with a front left clamping device (200), the front end of the right telescopic large arm (1100) is hinged with a front right clamping device (300), the rear clamping device (400) is arranged at the rear part of the frame assembly (100), and the pressing device (500) is arranged at the upper end part of the rear clamping device (400);
the left telescopic large arm (1000) and the right telescopic large arm (1100) can drive the front left clamping device (200) and the front right clamping device (300) to synchronously move back and forth and horizontally and vertically rotate inwards relative to the corresponding telescopic large arm to clamp the tire (05) of the aircraft landing gear (04) when synchronously acting through the hydraulic system (800), and the rear clamping device (400) moves back and forth through the hydraulic system (800) and compresses the tire (05) of the aircraft landing gear (04) through the compressing device (500); the synchronous forward-backward movement adjustment of the front left clamping device (200), the front right clamping device (300) and the rear clamping device (400) enables the tire (05) of the aircraft landing gear (04) to be located at the front-rear central position of the tractor (02) and realizes the automatic approaching and optimal contact of the tire (05) of the aircraft landing gear (04);
four corners of two sides of the frame assembly (100) are connected with a tractor body (03) of a tractor (02) through a lifting device (600), the lifting device (600) synchronously acts to realize integral lifting and descending of the frame assembly (100), and meanwhile, the lifting device (600) can automatically lift or descend according to height change of tires (05) of an aircraft landing gear (04) to form a new stress balance state so as to avoid torsion damage to the aircraft landing gear (04) caused by a wheel clasping mechanism (01);
the guide limiting device (700) is arranged between the side part of the frame assembly (100) and a vehicle body (03) of the tractor (02) and can limit the position of the frame assembly (100) in the front-back direction and the left-right direction when the frame assembly (100) is lifted up or put down according to the lifting device (600).
2. The wheel embracing mechanism for an aircraft tractor according to claim 1, wherein: the frame assembly (100) comprises a frame left part (110), a frame right part (120) and a rectangular cross beam (101), wherein the rectangular cross beam (101) connects the frame left part (110) and the frame right part (120) together, and the joint is reinforced by a reinforcing rib plate I (1021) and a reinforcing rib plate II (1022); the left side and the right side of the upper part of the rectangular cross beam (101) are connected with telescopic oil cylinders A (801) and are provided with rear seats A (103) used for installing the telescopic oil cylinders A (801), the rear ends of the telescopic oil cylinders A (801) are connected with the rear seats A (103) in the horizontal direction through pin shafts A (104), and meanwhile, the telescopic oil cylinders A (801) can swing up and down around the axis line of the rear seats A (103);
the frame left part (110) and the frame right part (120) have the same structure and are symmetrical left and right; the left part (110) of the frame is formed by welding a rectangular girder a (111), a C-shaped channel steel (112), a transverse reinforcing beam (113) and a C-shaped reinforcing plate (114); the C-shaped upright I (115) and the C-shaped upright II (116) are welded on the outer side of the rectangular girder a (111), the C-shaped upright I (115) is vertically welded on the outer side of the front end of the C-shaped channel steel (112), and the C-shaped upright II (116) is vertically welded on the outer side of the rear part of the rectangular girder a (111); the upper part of the rectangular girder a (111) is provided with a telescopic oil cylinder B (802), the rear part of the upper part of the rectangular girder a (111) is provided with a rear seat B (117) connected with the rear end of the telescopic oil cylinder B (802), the rear end of the telescopic oil cylinder B (802) is connected with the rear seat B (117) through a pin shaft B (105), and meanwhile, the telescopic oil cylinder B (802) can swing up and down around the axis line of the rear seat B (117); a telescopic oil cylinder C (803) is arranged at the upper part of the C-shaped channel steel (112), a rear seat C (118) is welded at the upper part of the C-shaped channel steel (112), the rear end of the telescopic oil cylinder C (803) is connected with the rear seat C (118) in the vertical direction through a pin shaft C (106), and meanwhile, the telescopic oil cylinder C (803) can swing left and right in the horizontal direction around the axial lead of the rear seat C (118); a notch K is formed in one side, close to the telescopic oil cylinder C (803), of the C-shaped upright post I (115), so that a swinging space is reserved for the telescopic oil cylinder C (803) to swing left and right in the horizontal direction around the axis line of the rear seat C (118); a composite roller II (109) is arranged on the lower side of the front part of the C-shaped upright post I (115) and the lower side of the rear part of the C-shaped upright post II (116), and at least 2 composite rollers I (108) which are horizontally arranged are arranged on the inner side of the rectangular girder a (111) in the horizontal direction; the rectangular girder a (111) is of a rectangular steel pipe structure, and guide sliders (107) are arranged on the horizontal plane and the vertical plane inside the front end of the rectangular girder a.
3. The wheel embracing mechanism for an aircraft tractor according to claim 2, wherein: the left telescopic big arm (1000) and the right telescopic big arm (1100) are in a bilateral symmetry structure;
the rear part of the left large telescopic arm (1000) is a left rectangular cylinder (1001), four planes near the end part of the left large telescopic arm are provided with left guide sliding blocks (1004), the left head part (1002) of the left large telescopic arm (1000) is of a semicircular structure and is provided with a mounting hole for mounting a left large arm spindle (1003), the left large arm spindle (1003) connects the left large telescopic arm (1000) with the front left clamping device (200), the front left clamping device (200) can horizontally rotate around the central axis of the left large arm spindle (1003), and meanwhile, the head part of the telescopic oil cylinder A (801) is provided with a mounting hole and is connected to the upper part of the left large arm spindle (1003); a left rectangular column (1001) at the rear part of the left telescopic big arm (1000) is arranged in an inner hole of a rectangular girder a (111) of the left part (110) of the frame, and the left telescopic big arm (1000) is limited to move up and down and left and right through a left guide slide block (1004) and a guide slide block (107) in the inner hole of the rectangular girder a (111) so as to achieve the function that the left telescopic big arm (1000) can only stretch back and forth; a left composite roller (1005) is installed on the outer side of the left head (1002) of the left telescopic big arm (1000), and when the left telescopic big arm (1000) is stretched back and forth, the left composite roller (1005) rolls in a track of a C-shaped channel steel (112) of a frame assembly (100) to ensure that the left telescopic big arm (1000) is well stressed;
the rear part of the right telescopic boom (1100) is a right rectangular cylinder (1101), four planes close to the end part of the right telescopic boom are provided with right guide sliding blocks (1104), the right head (1102) of the right telescopic boom (1100) is of a semicircular structure and is provided with a mounting hole for mounting a right boom main shaft (1103), the right boom main shaft (1103) connects the right telescopic boom (1100) with the front right clamping device (300) together, the front left clamping device (200) can rotate around the central axis of the right boom main shaft (1103), and meanwhile, the head part of a telescopic oil cylinder A (801) on the right side of the frame assembly (100) is provided with a mounting hole and is connected to the upper part of the right boom main shaft (1103); a right rectangular column (1101) at the rear part of the right telescopic big arm (1100) is installed in an inner hole of a rectangular girder a (111) of the right part (120) of the frame, and a right guide slide block (1104) at the rear part of the right telescopic big arm (1100) and a guide slide block (107) in the inner hole of the rectangular girder a (111) are combined to limit the up-and-down and left-and-right movement of the right telescopic big arm (1100) so as to achieve the function that the right telescopic big arm (1100) can only stretch back and forth; and a right composite roller (1105) is arranged on the outer side of the right head (1102) of the right telescopic big arm (1100), and when the right telescopic big arm (1100) is stretched back and forth, the right composite roller (1105) on the right telescopic big arm rolls in a track of a C-shaped channel steel (112) on the right side of the frame assembly (100) so as to ensure that the right telescopic big arm (1100) is well stressed.
4. The wheel embracing mechanism for an aircraft tractor according to claim 3, wherein: the front left clamping device (200) and the front right clamping device (300) have the same structure and are symmetrical left and right;
the front left clamping device (200) is mounted at the front part of the left telescopic big arm (1000) and is hinged through a left big arm spindle (1003) to realize that the front left clamping device (200) can rotate around the axis line of the left big arm spindle (1003); the front left clamping device (200) comprises a left clamping frame (201), a left clamping lower seat (202), a left turning cylinder (203), a left turning eccentric wheel (204), a left lining (205), a left self-locking cylinder (206), a left guide sleeve (207), a left bearing (208) and a left end face bearing (209); the left holding frame (201) is of an integral structure welded or cast in a frame mode, an upper left mounting seat (210) and a lower left mounting seat (211) are arranged on the left side of the left holding frame (201), and a left mounting hole (212) for a left big arm spindle (1003) to penetrate through is formed in the upper left mounting seat (210) and the lower left mounting seat (211); the left upper mounting seat (210) and the left lower mounting seat (211) are mounted at the head of the left big arm spindle (1003) through a left end face bearing (209), and the left end face bearing (209) transmits the gravity borne by the left clamping device (200) to the left telescopic big arm (1000); the left clamping lower seat (202) is hinged to a left hole I (213) on the left lower side of the left clamping frame (201) through a left bushing (205) and a left turning eccentric wheel (204), the left clamping lower seat (202) is hinged to a right hole I (214) on the right lower side of the left clamping frame (201) through the left bushing (205) and a left guide sleeve (207), and the left hole I (213) and the right hole I (214) are coaxially designed and are used for ensuring that the left clamping lower seat (202) can rotate around the axial lead of the left clamping lower seat; the upper part of the left overturning cylinder (203) is hinged with a left upper cross beam (215) of the left holding clamp frame (201) through a left cylinder seat (216), the lower part of the left overturning cylinder (203) is hinged with a left overturning eccentric wheel (204), a left piston rod (2031) of the left overturning cylinder (203) can drive the left overturning eccentric wheel (204) to rotate around a left axial lead (217) of a left hole I (213) and a right hole I (214) through telescopic action, and the left holding clamp lower seat (202) can be overturned up and down; the left turning eccentric wheel (204) is connected with the left clamp lower seat (202) through a left bolt (218);
the rotation action of the front left clamping device (200) adopts a connecting rod principle: a left hinge mounting hole (219) is formed in a left upper mounting seat (210) of the left holding and clamping frame (201), and the left hinge mounting hole (219) is hinged to the head of a telescopic oil cylinder C (803) through a left hinge shaft (220); the flexible direction of the flexible hydro-cylinder B (802) of frame assembly (100) left side is parallel with the flexible direction of the big arm (1000) of left side flexible, the left side outside of flexible hydro-cylinder B (802) is arranged in to the flexible hydro-cylinder C (803) of frame assembly (100) left side, left side articulated mounting hole (219) is in left side hole I (213) and the left axial lead (217) direction left side outside and the partial front side of right side hole I (214).
The front right clamping device (300) is mounted at the front part of the right telescopic boom (1100) and is hinged through a right boom main shaft (1103), and the front right clamping device (300) can rotate around the axial lead of the right boom main shaft (1103); the front right clamping device (300) comprises a right clamping frame (301), a right clamping lower seat (302), a right turning cylinder (303), a right turning eccentric wheel (304), a right bushing (305), a right self-locking cylinder (306), a right guide sleeve (307), a right bearing (308) and a right end face bearing (309); the right holding clamp frame (301) is of an integral structure formed by frame type welding or casting, a right upper mounting seat (310) and a right lower mounting seat (311) are arranged on the right side of the right holding clamp frame (301), and a right mounting hole (312) for a right large arm spindle (1103) to pass through is formed in the right upper mounting seat (310) and the right lower mounting seat (311); the right upper mounting seat (310) and the right lower mounting seat (311) are mounted at the head of the right telescopic big arm (1100) through a right end face bearing (309), and the right end face bearing (309) transmits the gravity borne by the right clamping device (300) to the right telescopic big arm (1100); the right holding clamp lower seat (302) is hinged with a right hole II (313) on the lower right side of the right holding clamp frame (301) through a right bushing (305) and a right turning eccentric wheel (304); the right holding clamp lower seat (302) is hinged with a left hole II (314) on the left lower side of the right holding clamp frame (301) through a right bushing (305) and a right guide sleeve (307), and meanwhile, the right hole II (313) and the left hole II (314) are coaxially designed and are used for ensuring that the right holding clamp lower seat (302) can rotate around the axial lead of the right holding clamp lower seat; the upper part of the right overturning cylinder (303) is hinged with a right upper cross beam (315) of the right holding clamp frame (301) through a right cylinder seat (316), the lower part of the right overturning cylinder (303) is hinged with a right overturning eccentric wheel (304), and a right piston rod (3031) of the right overturning cylinder (303) can drive the right overturning eccentric wheel (304) to rotate around a right axis (317) of a right side hole II (313) and a left side hole II (314) through telescopic action and further realize the up-and-down overturning of the right holding clamp lower seat (302); the right overturning eccentric wheel (304) is connected with the right clamp lower seat (302) through a right bolt (318);
the rotation action of the front right clamping device (300) adopts a connecting rod principle: a right hinged mounting hole (319) is formed in a right upper mounting seat (310) of the right holding clamp frame (301) and is hinged to the head of a telescopic oil cylinder C (803) through a right hinged shaft (320); the telescopic direction of a telescopic oil cylinder B (802) on the right side of the frame assembly (100) is parallel to the telescopic direction of the right telescopic boom (1100), and a telescopic oil cylinder C (803) on the right side of the frame assembly (100) is arranged on the right outer side of the right telescopic oil cylinder B (802), and a right hinge mounting hole (319) is arranged on the right outer side of the right side hole II (313) and the right axial lead (317) of the left side hole II (314) and is deviated to the front side;
the left locking cylinder (206) is arranged at the upper part of the front left clamping device (200), and the tail part of the left locking cylinder (206) is hinged with a left cylinder seat (221) at the inner side of an upper cross beam of the left clamping frame (201); when the left clamping device (200) and the right clamping device (300) are locked in a closed mode, a left locking piston rod (2061) of the left locking cylinder (206) penetrates through a hole in the middle of the left bushing (205) to extend out, so that the left clamping device (200) and the front right clamping device (300) are connected in series for locking;
the right locking cylinder (306) embraces in the front right and presss from both sides device (300) lower part, right locking cylinder (306) afterbody is embraced with the right cylinder seat (320) hinged joint on the clamp holder (301) bottom end rail inboard in the right side, and when embracing clamp device (200) and embracing clamp device (300) closed locking in the front left side, the right locking piston rod (3061) of right locking cylinder (306) passes the hole in the middle of right uide bushing (307) and embraces left uide bushing (207) of clamp holder (201) with a left side and embrace clamp holder (201) with a left side and concatenate and realize locking together.
5. The wheel embracing mechanism for an aircraft tractor according to claim 4, wherein: the rear clamping device (400) is provided with a welded rear clamping body (410), the rear clamping body (410) is formed by welding a bucket (411), a left rail (412), a right rail (413) and a cross beam (414) into a whole, the left rail (412) is welded at the front, rear, upper and lower middle positions on the left side of the bucket (411), the right rail (413) is welded at the front, rear, upper and lower middle positions on the right side of the bucket (411), a support (415) for installing a pressing plate arm (501) of a pressing device (500) is welded at the upper part of the bucket (411), the cross beam (414) is welded at the rear part of the bucket (411), and the cross beam (414), the bucket (411), the left rail (412) and the right rail (413) are welded together in an enhanced mode to bear larger weight; the support (415) is arranged on the left side and the right side of the upper part of the bucket (411) and provided with a pressing plate arm pin shaft (401), the two pressing plate arm pin shafts (401) are coaxially arranged, and the pressing plate arms (501) can rotate around the axial lead of the pressing plate arm pin shafts (401); the rear upper part of the cross beam (414) is welded with a platen oil cylinder tail support (416), the platen oil cylinder tail supports (416) are respectively arranged at the left and right symmetrical positions, a platen oil cylinder tail pin shaft (402) is arranged in a mounting hole of the platen oil cylinder tail support (416), the tail part of a platen oil cylinder (804) is hinged and arranged on the platen oil cylinder tail pin shaft (402), the two platen oil cylinder tail pin shafts (402) are coaxially arranged, and the platen oil cylinder (804) can rotate around the axial lead of the platen oil cylinder tail pin shaft (402); hinged mounting holes for telescopic oil cylinders A (801) are formed in the left side and the right side of the bucket (411), a telescopic oil cylinder hinged front pin shaft (403) is mounted in the mounting holes, the two telescopic oil cylinder hinged front pin shafts (403) are coaxially arranged, and the telescopic oil cylinders A (801) can rotate around the axial lead of the telescopic oil cylinder hinged front pin shaft (403);
the left rail (412) and the right rail (413) of the rear clamping device (400) are respectively butted with the composite rollers I (108) on the inner sides of the rectangular girders a (111) on the left side and the right side of the frame assembly (100), the composite rollers I (108) on the left side and the right side can respectively roll back and forth in the left rail (412) and the right rail (413), the rear clamping device (400) is limited to move up and down and left and right through the composite rollers I (108), and the fact that the rear clamping device (400) is driven to move back and forth smoothly when the telescopic cylinder A (801) stretches back and forth is ensured.
6. The wheel embracing mechanism for an aircraft tractor according to claim 5, wherein: the pressing device (500) comprises pressing plate arms (501) arranged on the left and right, a pressing plate (502) arranged on the upper portion of the pressing plate arms (501), a pin shaft (503) for hinged connection of the pressing plate arms (501) and the pressing plate (502), a pressing oil cylinder (804), a pressing plate torsion spring (504) and a hinged pin shaft (505); the pressing plate arm (501) is hinged to a support (415) of the rear clamping device (400) through a pressing plate arm pin shaft (401) and can rotate around the axis line of the pressing plate arm pin shaft (401); an oil cylinder head (8041) of the pressing oil cylinder (804) is hinged with a hole in the middle upper part of the pressing plate arm (501) through a hinge pin shaft (505), the tail part of an oil cylinder barrel (8042) of the pressing oil cylinder (804) is hinged and connected to a pressing plate oil cylinder tail support (416) of the rear clamping device (400) through a pressing plate oil cylinder tail pin shaft (402), the pressing oil cylinder (804) is arranged in 1 group in a bilateral symmetry mode, and a pressing piston rod (8043) of the pressing oil cylinder (804) stretches out and draws back to drive the pressing plate arm (501) to rotate around the axial lead of the pressing plate arm pin shaft (401);
the pressing plate arm (501) is hinged with the pressing plate (502) through a pin shaft (503) and gives a certain torsion to the pressing plate (502) through a pressing plate torsion spring (504);
the contact surface of the pressure plate (502) and the tire (05) is an arc surface;
the rear holding clamp body (410) of the rear holding clamp device (400) is provided with a large arc surface and is used for adapting to the arc surfaces of tires (05) of aircraft landing gears (04) of different models so as to ensure that the holding wheel mechanism is in good contact when holding tires of different diameters.
7. The wheel embracing mechanism for an aircraft tractor according to claim 6, wherein: the lifting device (600) comprises lifting oil cylinders (805) arranged at four angular positions on the left outer side and the right outer side of the frame assembly (100), lifting oil cylinder heads (8051) of the lifting oil cylinders (805) are respectively hinged with upper mounting holes of a C-shaped stand column I (115) and a C-shaped stand column II (116) welded on the left side and the right side of the frame assembly (100) through lifting oil cylinder pin shafts (601), and the lifting oil cylinders (805) can rotate around the axial lead of the lifting oil cylinder pin shafts (601); the upper end of the lifting oil cylinder (805) inclines to the center of the wheel clasping mechanism (01) by a certain angle so as to provide upward supporting force for the whole wheel clasping mechanism (01) and simultaneously provide certain component force towards the center from the left side and the right side respectively, so that when the two sides of the wheel clasping mechanism (01) are stressed unevenly, the lifting oil cylinder (805) can automatically return to the center, meanwhile, the lifting oil cylinder is inclined to the center certainly, and the phenomenon that the lifting oil cylinder inclines outwards to cause side turning when the single side of the wheel clasping mechanism (01) is stressed excessively can be prevented; the lower part (8052) of the cylinder barrel of the lifting oil cylinder (805) is hinged and connected to a vehicle body (03) of the tractor (02) by a lower pin shaft (602) of the lifting oil cylinder, and the wheel embracing mechanism (01) is integrally supported by four lifting oil cylinders (805) of the lifting device (600);
lifting oil cylinders (805) arranged at four corners of the wheel clasping mechanism (01) act simultaneously to realize integral lifting and descending of the frame assembly (100), and the lifting oil cylinders (805) are connected in parallel through oil inlet paths (805a) and oil return paths (805b) to realize automatic lifting or descending according to height change of tires (05) of the aircraft landing gear (04) to form a new stress balance state so as to avoid torsion damage to the landing gear (04) caused by the wheel clasping mechanism (01).
8. The wheel embracing mechanism for an aircraft tractor according to claim 7, wherein: the guide limiting device (700) comprises four C-shaped channel steel guide rails (701) fixed on a tractor body (03) of the tractor (02), and the positions of the C-shaped channel steel guide rails (701) correspond to the positions of the composite rollers II (109) of the frame assembly (100) to ensure that the composite rollers II (109) roll smoothly up and down in the C-shaped channel steel guide rails (701); when the frame assembly (100) is lifted up or put down by the lifting device (600), the position of the compound roller II (109) in the front-back direction and the left-right direction is limited by the inner side surface of the C-shaped channel steel guide rail (701) so as to realize the integral action limitation of the wheel clasping mechanism (01); the composite rollers II (109) on the outer side face of the frame assembly (100) can be arranged in a group in a single or multiple up-and-down mode in the corresponding C-shaped channel steel guide rails (701);
the lifting device (600) and the guide limiting device (700) jointly act to realize automatic adaptive protection and limiting protection of up-and-down movement and left-and-right inclined movement of the frame assembly (100).
9. The wheel embracing mechanism for an aircraft tractor according to claim 8, wherein: the hydraulic system (800) is used for providing power and control for each motion unit of the wheel clasping mechanism (01), and comprises a telescopic oil cylinder A (801), a telescopic oil cylinder B (802), a telescopic oil cylinder C (803), a left turning cylinder (203), a left self-locking cylinder (206), a right turning cylinder (303), a right self-locking cylinder (306), a pressing oil cylinder (804), four lifting oil cylinders (805), a hydraulic power unit (806), a hydraulic control valve (807) and a hydraulic energy accumulator (808).
10. The wheel embracing mechanism for an aircraft tractor according to claim 9, wherein: the safety control system (900) comprises a pressure sensor (901) for monitoring an energy accumulator (808), a pressure sensor A (902) installed at an oil inlet (805a) of a lifting oil cylinder (805), a pressure sensor B (903) installed at an oil inlet of a pressing oil cylinder (804), a left proximity switch (904) installed at the extending position of a left locking piston rod (2061) of a left self-locking cylinder (206) of a front left clamping device (200), a left angle sensor I (905) of a left turning eccentric wheel (204) axis, a right proximity switch (906) installed at the extending position of a right locking piston rod (3061) of a right locking cylinder (306) of a front right clamping device (300), a right angle sensor I (907) of a right turning eccentric wheel (304) axis, a left angle sensor (908) installed at the upper part of a left large arm main shaft (1003) of a left telescopic arm (1000) and used for detecting the angles of the left telescopic arm (1000) and the front left clamping device (200), and a right angle sensor (908) installed at the upper part of, And a right angle sensor II (909) which is arranged at the upper part of a right boom main shaft (1103) of the right telescopic boom (1100) and is used for detecting the angle between the right telescopic boom (1000) and the front right holding and clamping device (200).
CN202110032877.9A 2021-01-12 2021-01-12 Wheel holding mechanism for aircraft tractor Pending CN112829962A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110032877.9A CN112829962A (en) 2021-01-12 2021-01-12 Wheel holding mechanism for aircraft tractor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110032877.9A CN112829962A (en) 2021-01-12 2021-01-12 Wheel holding mechanism for aircraft tractor

Publications (1)

Publication Number Publication Date
CN112829962A true CN112829962A (en) 2021-05-25

Family

ID=75929563

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110032877.9A Pending CN112829962A (en) 2021-01-12 2021-01-12 Wheel holding mechanism for aircraft tractor

Country Status (1)

Country Link
CN (1) CN112829962A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113353280A (en) * 2021-06-28 2021-09-07 中国船舶重工集团公司第七一三研究所 Multifunctional aircraft rescue device
CN114084367A (en) * 2021-12-22 2022-02-25 中国民航大学 Emergency rescue equipment for tire burst of airplane wheel, use method and application
CN115991287A (en) * 2023-02-23 2023-04-21 沈阳坦择实业有限公司 Unmanned electric rodless tractor for airplane

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113353280A (en) * 2021-06-28 2021-09-07 中国船舶重工集团公司第七一三研究所 Multifunctional aircraft rescue device
CN114084367A (en) * 2021-12-22 2022-02-25 中国民航大学 Emergency rescue equipment for tire burst of airplane wheel, use method and application
CN114084367B (en) * 2021-12-22 2023-03-24 中国民航大学 Emergency rescue equipment for tire burst of airplane wheel, use method and application
CN115991287A (en) * 2023-02-23 2023-04-21 沈阳坦择实业有限公司 Unmanned electric rodless tractor for airplane

Similar Documents

Publication Publication Date Title
CN112829962A (en) Wheel holding mechanism for aircraft tractor
US4930598A (en) Scissors lift apparatus
CN110303279B (en) Horizontal pre-assembling device for H-shaped steel
WO1980000434A1 (en) Device for loading and unloading lift truck
CN204198338U (en) A kind of vehicle-mounted floating formula vehicle maintenance and repair lifting machine
CN209259170U (en) A kind of transporting oil drum tilting device
CN105329803A (en) Vehicle-mounted flow type automobile maintenance lifting machine
CN108128734A (en) Heavy coil of strip carrier
CN214451907U (en) Wheel holding mechanism for aircraft tractor
US3727781A (en) Lift truck load lifting mechanism
CN113173526A (en) Fork head assembly and three-way stacking vehicle
CN210366695U (en) Online turnover mechanism on automobile chassis assembly line
RU2405734C1 (en) Mine cage mounting device (versions)
CN116040477A (en) Crane for automatic oxidation workshop
CN115818518A (en) Light-load type stacker
CN202465199U (en) Reach truck mast
CN212532057U (en) Main body frame lifting and translating mechanism
CN209815565U (en) Bogie lifting hydraulic pressure device with herringbone spring as tying spring
CN113695828A (en) Frame upset frock
GB2146616A (en) Lifting jack
CN209635828U (en) A kind of concrete prefabricated board die station piler door-opening mechanism
CN112502151A (en) Inclination angle adjusting device of pile frame of hydraulic pile driver
CN206581657U (en) A kind of three-dimensional parking device
CN218778264U (en) Vertical cargo carrying device and stacking machine
CN210973776U (en) Electrodynamic type lift platform suitable for high-order welding operation

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination