阅读说明：本技术 无杆飞机牵引车自调整抱轮夹持装置 (Self-adjusting wheel-holding clamping device of rodless aircraft tractor ) 是由 刘晖 母梦新 陈大伟 舒宁 于 2020-06-23 设计创作，主要内容包括：本发明公开了无杆飞机牵引车自调整抱轮夹持装置,属于飞行器、航空、宇宙航行的技术领域。该夹持装置包括承载底板、锁止缸,承载底板具有导轨结构,夹持装置可沿导轨在承载底板上滑动,锁止缸为双出杆式液压缸,结合控制阀的使用实现夹持装置移动的控制。在夹紧前轮过程中,夹持装置根据自身需要自动调整位置,直至完全夹紧前轮,避免了附加载荷的产生,解决了现有牵引车的自身结构缺陷以及作业过程中的安全隐患问题,提高了无杆牵引作业的安全性。(The invention discloses a self-adjusting wheel-holding clamping device of a rodless aircraft tractor, and belongs to the technical field of aircrafts, aviation and space navigation. The clamping device comprises a bearing bottom plate and a locking cylinder, wherein the bearing bottom plate is provided with a guide rail structure, the clamping device can slide on the bearing bottom plate along a guide rail, the locking cylinder is a double-rod hydraulic cylinder, and the movement of the clamping device is controlled by combining the use of a control valve. In the process of clamping the front wheel, the clamping device automatically adjusts the position according to self requirements until the front wheel is completely clamped, so that the generation of additional load is avoided, the problems of self structural defects of the existing tractor and potential safety hazards in the operation process are solved, and the safety of rodless traction operation is improved.)

1. The self-adjusting wheel holding device of the rodless aircraft tractor is characterized by comprising a bearing bottom plate and a locking cylinder, wherein the bearing bottom plate comprises a plate body, a guide rail for the holding device to slide extends from the plate body, the guide rail has an angle with a horizontal plane, the back of the plate body is hinged with a lifting device, one end of the locking cylinder is hinged with one surface of the plate body facing the holding device, the other end of the locking cylinder is hinged with the holding device, and the installed locking cylinder is parallel to the guide rail.

2. The self-adjusting wheel-embracing clamping device for the rodless aircraft tractor according to claim 1, wherein two ends of the locking cylinder are respectively hinged to the plate body and the clamping device.

3. The self-adjusting wheel-embracing clamping device for the rodless aircraft tractor according to claim 1, wherein the locking cylinder is a double-out-rod hydraulic cylinder that extends and retracts in cooperation with a control valve.

4. The self-adjusting wheel-embracing clamping device for the rodless aircraft tractor according to claim 1, wherein a limiting block for limiting an initial position of the clamping device is mounted at the tail end of the guide rail, and the tail end of the guide rail is one end in a compression direction of the locking cylinder.

Technical Field

The invention belongs to the technology of airport ground support equipment, in particular to a self-adjusting wheel-holding clamping device of a rodless airplane tractor, and belongs to the technical field of aircrafts, aviation and space navigation.

Background

A rodless aircraft tractor is a special vehicle for carrying out traction operation on an aircraft when an aircraft engine is in a closed state, and the front wheel of the aircraft is held tightly and lifted by a wheel holding and lifting mechanism, so that the front wheel of the aircraft is separated from the ground, and the aircraft is moved to a target place. The performance of the wheel holding clamping-lifting mechanism serving as a core device of the rodless aircraft tractor directly influences whether a vehicle can be well butted with an aircraft or not, the nose landing gear of the aircraft is protected from being damaged, the occurrence of traction accidents is reduced, and therefore the operation efficiency is improved.

The basic structure of the rodless tractor is shown in fig. 1, and the basic structure of the wheel embracing clamping-lifting mechanism is shown in fig. 2 and 3. The clamping mechanism is driven to clamp the front wheel of the airplane by using hydraulic pressure as power, and the lifting actuating cylinder is driven to lift the front wheel of the airplane. The clamping mechanism generally includes a door panel, a load-bearing bucket, front and rear upper press plates, and a plurality of drive rams. When the airplane is clamped, the front wheel of the airplane is slowly pulled onto the bearing hopper by the door plate, then the bearing hopper is adjusted to a proper position, and the front upper pressure plate and the rear upper pressure plate are driven to clamp the front wheel of the airplane. At the moment, the contact points of the front wheels of the airplane and the mechanism are four in total, and the contact points comprise a bearing bucket, a door plate and a front upper pressure plate and a rear upper pressure plate. The device restrains 6 degrees of freedom of the front wheel of the airplane and prevents the front wheel from being separated in the traction process. After the clamping operation is finished, the whole wheel holding clamping device and the front wheel of the airplane are lifted through the lifting actuating cylinder, so that the wheel holding clamping device and the front wheel of the airplane are completely separated from the ground, and the preparation for airplane traction is finished.

However, the conventional wheel holding mechanism has some problems in the use process. Because it parks to be difficult to realize accurate position during the tractor operation, embrace wheel centre of grip and wheel central point and put often not coincide when parkking, certain deviation appears, need eliminate through the removal of aircraft or tractor, this problem is solved to the mode that relies on the load drive tractor that produces in the centre gripping process to remove to the normal way, but this load can produce the influence to aircraft nose landing gear when eliminating position deviation, and because the offset, the difference of driver's manipulation mode, the load size also has and changes, probably influence the structural security of nose landing gear even.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a self-adjusting wheel-clasping clamping device of a rodless aircraft tractor, which endows the clamping device with translational freedom degree in the advancing direction of a vehicle through a guide rail mechanism of a bearing bottom plate, and the clamping device automatically adjusts the position under the action of reaction force in the clamping process, so that the self-adjustment of the deviation of the wheel-clasping clamping center and the wheel center position is realized, the additional load generated by driving the tractor to move by the load generated in the clamping process is eliminated, and the technical problem that the structural safety of the front undercarriage of the aircraft is influenced by the additional load generated by the deviation of the wheel-clasping clamping center and the wheel center position in the conventional wheel-clasping clamping device is.

The invention adopts the following technical scheme for realizing the aim of the invention:

the self-adjusting wheel holding device of the rodless aircraft tractor comprises a bearing bottom plate and a locking cylinder, wherein the bearing bottom plate comprises a plate body, a guide rail for the holding device to slide extends from the plate body, the guide rail has an angle with a horizontal plane, the back of the plate body is hinged with a lifting device, one end of the locking cylinder is hinged with one surface of the plate body facing the holding device, the other end of the locking cylinder is hinged with the holding device, and the installed locking cylinder is parallel to the guide rail.

Furthermore, the rodless aircraft tractor self-adjusts and embraces wheel clamping device, and the both ends of locking cylinder are articulated with plate body, clamping device respectively.

Furthermore, the rodless aircraft tractor self-adjusts the wheel clamping device of embracing, and the locking cylinder is the flexible two play pole formula pneumatic cylinders of cooperation control valve.

Furthermore, the rodless aircraft tractor self-adjusts and embraces wheel clamping device, and the stopper of restriction clamping device initial position is installed to the end of guide rail, and the guide rail end is the one end of locking cylinder compression direction.

Furthermore, the rodless aircraft tractor self-adjusts the wheel clamping device of embracing, and the plate body is opened has the notch that holds clamping device protrusion mechanism.

By adopting the technical scheme, the invention has the following beneficial effects: the bearing bottom plate with the guide rail mechanism is added, so that the translation freedom degree of the clamping device in the advancing direction of the vehicle is given, the positions of the vehicle and the airplane are kept unchanged in the process of clamping the front wheel of the airplane, the positions of the clamping device are automatically adjusted by the reaction force until the front wheel is completely clamped, and in the process, the positions of the vehicle and the airplane are not changed, so that the influence of additional load on the front wheel of the airplane is avoided; in addition, after the traction operation is finished, the clamping device can return to the initial position according to the self gravity without the influence of external force.

Drawings

Fig. 1 is a basic configuration diagram of a rodless tractor.

Fig. 2 is a structural diagram of the clasping wheel clamping-lifting mechanism.

Fig. 3 is a side view of the clasping wheel clamping-lifting mechanism.

Fig. 4 is a structural diagram of the self-adjusting wheel holding device of the present application.

Fig. 5 is a structural diagram of the load-bearing bottom plate of the present application.

Fig. 6 is a schematic view of the installation angle of the load-bearing bottom plate.

Fig. 7 is a cross-sectional view of the lock cylinder.

The reference numbers in the figures illustrate: 1. the device comprises a bearing bottom plate, 1-1 parts of a plate body, 1-2 parts of a limiting block, 1-3 parts of a guide rail, 2 parts of a locking cylinder, 2-1 parts of a control valve, 2-2 parts of an outer cylinder, 2-3 parts of a piston rod, 3 parts of a lifting device, 4 parts of a clamping device.

Detailed Description

The technical scheme of the invention is explained in detail in the following with reference to the attached drawings.

The self-adjusting wheel clamping device applied to the rodless aircraft tractor is shown in fig. 4 and comprises: a load floor 1, a locking cylinder 2, a lifting device 3 and a clamping device 4. The bearing bottom plate is used for realizing the connection between the clamping device and the frame and the connection between the bearing bottom plate and the clamping device through the locking cylinder, the moving direction of the clamping device is restrained through the sliding pair, and the clamping device returns to the initial position after the traction is finished by utilizing the dead weight of the clamping device.

As shown in fig. 5, the bearing bottom plate adopts an "L" type structure, which specifically includes: the plate comprises a plate body 1-1, a guide rail 1-3 extends from the plate body 1-1 along the moving direction of a clamping device, a limiting block 1-2 for limiting the initial position of the clamping device is arranged at the tail end of the guide rail 1-3, a groove formed in the guide rail 1-3 and a sliding block at the bottom of the clamping device form a moving pair, the moving pair ensures that the clamping device can slide along the length direction of the guide rail and limits the freedom degree of the clamping device in other directions, the back of the plate body 1-1 is hinged with a lifting device through a rotating pair, a notch for accommodating the action of a convex structure of the clamping device is formed in the plate body 1-1, and the convex structure of the clamping device is a structure marked by a. When the load floor is installed, the guide rails 1-3 are at an angle θ to the horizontal as shown in fig. 6.

As shown in fig. 7, the locking cylinder 2 adopts a double-rod hydraulic cylinder, so as to avoid the landing gear bearing additional load caused by excessive resistance in the telescopic process, and specifically comprises: the control valve 2-1, the outer cylinder 2-2 and the piston rod 2-3, the control valve 2-1 is connected with the left oil cavity and the right oil cavity, the connection and disconnection of the two oil cavities are realized through the switch of the control valve, and then the piston rod 2-3 is controlled to be capable of freely extending and retracting. The lifting lug at the left end of the outer cylinder 2-2 is hinged with the bearing bottom plate by adopting a rotating pair, and the lifting lug at the right end of the piston rod 2-3 is hinged with the clamping device by adopting a rotating pair. During installation, the locking cylinder and the guide rail are arranged in parallel, and additional stress at the hinged position is avoided.

In the actual traction operation process, the working process of the self-adjusting wheel holding device is as follows: when the tractor runs to the front of the front wheel of the airplane, a control valve of a locking cylinder is opened by a driver control mechanism, a piston rod can freely stretch out and draw back, and when the front wheel is clamped by a clamping device, the locking cylinder extends due to external force, and the clamping device slides along a guide rail; after the front wheel is clamped, a driver operating mechanism closes a control valve of a locking cylinder, a piston rod is fixed, a clamping device is fixed, and then the front wheel is lifted and traction work is carried out; after the traction is finished, the clamping device puts down the front wheels of the airplane, the control valve of the locking cylinder is opened, the clamping device compresses the locking cylinder by means of dead weight because the guide rail and the horizontal plane have a certain included angle, moves in the opposite direction along the guide rail and returns to the initial position when touching the limiting block at the tail end of the guide rail.