CN212605500U

CN212605500U - Bidirectional balance valve type buffer system for aircraft tractor cab

Info

Publication number: CN212605500U
Application number: CN202021556635.7U
Authority: CN
Inventors: 黄小凡; 李洁
Original assignee: Chongqing Dahang Industry Co ltd
Current assignee: Chongqing Dahang Industry Co ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2021-02-26
Anticipated expiration: 2030-07-30

Abstract

The utility model discloses a two-way balance valve type buffer system for an aircraft tractor cab, which comprises a lifting oil cylinder and a lifting control electromagnetic valve which are connected through a hydraulic pipeline, wherein the lifting control electromagnetic valve is of a three-position four-way structure; and a bidirectional balance valve is arranged on the hydraulic pipeline. Preferably, the lifting control solenoid valve is connected with an oil pump through an oil supply pipeline, the oil supply pipeline is further provided with an overflow valve and an unloading solenoid valve which are arranged in parallel with the lifting control solenoid valve, the unloading solenoid valve is composed of a two-position two-way on-off valve, and oil return ports of the overflow valve and the unloading solenoid valve are connected with an oil return tank through the same oil return pipeline. The utility model has the advantages that the upgrading of the cab is stopped without vibration and abnormal sound, and the unloading electromagnetic valve is arranged on the oil supply pipeline, so as to reduce the energy consumption of the stopped non-working state system, reduce the heat productivity of the hydraulic element, reduce the failure rate and prolong the service life; and the hidden troubles of mechanical impact, increased mechanism load, shortened service life, dead movement and the like caused by the hydraulic lock are eliminated.

Description

Bidirectional balance valve type buffer system for aircraft tractor cab

Technical Field

The utility model relates to a special type vehicle hydraulic system, especially an aircraft tractor is two-way balanced valve formula buffer system for driver's cabin.

Background

The electric plane tractor is a special vehicle for airport plane traction, and because the tonnage of the plane is large and the traction power is large, the whole vehicle is usually provided with a hydraulic system for steering, braking, lifting of an upper cab and stretching of supporting legs. In an existing tractor cab lifting hydraulic system, a hydraulic lock mode is usually adopted to lock a lifted cab lifting position so as to prevent the cab from gradually falling under the action of gravity. When the lifting device is used, the cab can generate vibration and abnormal sound which stop immediately at the starting and stopping moments of lifting, so that the driving experience is influenced; meanwhile, the hydraulic lock is used, so that hydraulic pressure is not buffered, mechanical impact is caused, the load of a mechanical mechanism is increased, the service life is shortened, and the phenomenon of unbalanced sliding easily occurs, so that the movement is blocked. In addition, in the hydraulic system of the tractor, since the pressure requirements of the respective branch circuits are different, corresponding pressure values of the operating states of the respective systems are generally ensured by relief valves. In view of the particularity of the lifting of the cab, such as the fact that the cab is in a static state without lifting most of the time, when the lifting position of the cab is locked, the corresponding lifting control three-position four-way electromagnetic valve is in a hydraulic power cut-off state. However, the existing lifting hydraulic system only forms system backpressure through a corresponding overflow valve, pressure oil can only return oil through the overflow valve in the static state, and the cab lifting system still has backpressure with a high pressure value, so that the backpressure not only causes continuous heating of a hydraulic element, but also consumes power in vain, and energy waste is caused. For this reason, further improvement is required.

Disclosure of Invention

The utility model discloses an it is exactly not enough that there is vibration and abnormal sound when opening to the driver's cabin of current aircraft tractor goes up and down to open, provides a two-way balanced valve formula buffer system for aircraft tractor driver's cabin, and this system is through setting up the two-way balanced valve on the lift cylinder pipeline, utilizes the two-way balanced valve to lock the lift position of driver's cabin to open to going up and down to open and stop the stage and play the cushioning effect, thereby eliminate vibration and abnormal sound, promote the driving experience. An unloading electromagnetic valve of a two-position two-way on-off valve structure is further arranged on the oil supply pipeline, and an oil return port of the unloading electromagnetic valve is connected back to the oil tank through an oil return pipeline; the unloading electromagnetic valve directly returns oil without pressure oil in a cab, so that the energy consumption of a hydraulic system is reduced, the purposes of energy conservation and consumption reduction are achieved, and the service life is prolonged.

In order to achieve the above purpose, the present invention adopts the following technical solution.

A bidirectional balanced valve type buffer system for an aircraft tractor cab comprises a lifting oil cylinder and a lifting control electromagnetic valve which are connected through a hydraulic pipeline, wherein the lifting control electromagnetic valve is of a three-position four-way structure; and a bidirectional balance valve is arranged on the hydraulic pipeline.

By adopting the technical scheme, the two-way balance valve is arranged on the lifting oil cylinder pipeline, the lifting position of the cab is locked by the two-way balance valve to replace a hydraulic lock in the prior art, so that the buffering effect on the lifting start-stop stage is achieved by the balance action of the balance valve, the vibration and abnormal sound are eliminated, and the driving experience is improved; and the hidden troubles of mechanical impact caused by a hydraulic lock, increased mechanical mechanism load, shortened service life, easy occurrence of unbalanced sliding, motion clamping and the like are eliminated. Wherein, the lifting control electromagnetic valve is preferably of a soft reversing type to further reduce impact, vibration and abnormal sound.

Preferably, the lifting control solenoid valve is connected with an oil pump through an oil supply pipeline, the oil supply pipeline is further provided with an overflow valve and an unloading solenoid valve which are arranged in parallel with the lifting control solenoid valve, the unloading solenoid valve is composed of a two-position two-way on-off valve, and oil return ports of the overflow valve and the unloading solenoid valve are connected with an oil return tank through the same oil return pipeline. The working pressure of the overflow valve cab lifting system is within a set range, and the phenomenon that the sealing element is damaged to cause leakage due to overhigh pressure is avoided, so that the reliability is influenced. An oil return port of the unloading electromagnetic valve is connected with the oil tank through an oil return pipeline, so that the unloading electromagnetic valve directly flows back to the oil tank under the condition that the cab lift oil cylinder does not need pressure oil, at the moment, only pipeline fluid flow resistance consumption exists, the energy consumption is far less than that under the backpressure condition formed by an overflow valve, the energy consumption of a system is reduced, and the purposes of energy conservation and consumption reduction are achieved; the heating value of the hydraulic elements of the system can be reduced, and the service life of the system is prolonged.

Further preferably, the oil pump is connected with the oil tank through an oil inlet filter on the oil inlet pipeline. The pressure oil is clean, the pipeline and the valve port are prevented from being blocked, and the reliability is improved.

Further preferably, an oil inlet check valve connected with the oil inlet filter in parallel is arranged on the oil inlet pipeline. So as to open the one-way valve under the condition that the pressure of the oil supply filter is overhigh, and meet the requirement of continuous oil supply.

Further preferably, the oil return pipeline is connected back to the oil tank through an oil return filter. The residual impurities of the hydraulic element in the machining process are prevented from returning to the oil tank, and the oil supply is ensured to be clean.

Still further preferably, the oil return pipeline is provided with an oil return one-way valve connected with the oil return filter in parallel. When the oil return filter is blocked, the one-way valve is opened to ensure the oil return pipeline to be smooth.

Preferably, a one-way throttle valve is arranged on a hydraulic pipeline connected with the lifting oil cylinder. And the flow is regulated by utilizing the throttle valve to obtain a proper lifting speed, so that the vibration and abnormal sound are further reduced.

The utility model has the advantages that the upgrading of the cab is stopped without vibration and abnormal sound, and the unloading electromagnetic valve is arranged on the oil supply pipeline, so as to reduce the energy consumption of the stopped non-working state system, reduce the heat productivity of the hydraulic element, reduce the failure rate and prolong the service life; and the hidden troubles of mechanical impact caused by a hydraulic lock, increased mechanical mechanism load, shortened service life, easy occurrence of unbalanced sliding, motion clamping and the like are eliminated.

Drawings

Fig. 1 is a schematic view of the hydraulic principle of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, which are not intended to limit the scope of the embodiments described herein.

Referring to fig. 1, a two-way balanced valve type buffer system for an aircraft tractor cab comprises a lift cylinder 1 and a lift control solenoid valve 2 which are connected through a hydraulic pipeline, wherein the lift control solenoid valve 2 is in a three-position four-way structure and adopts a soft reversing type; the hydraulic pipeline is provided with a bidirectional balance valve 3, and the hydraulic pipeline is also provided with a one-way throttle valve 7.

Wherein, lift control solenoid valve 2 is connected with oil pump 4 through supplying oil pipe way, supply oil pipe way still be equipped with lift control solenoid valve 2 is parallelly connected overflow valve 5 and the uninstallation solenoid valve 6 that sets up, and this uninstallation solenoid valve 6 comprises the on-off valve of two-way, and overflow valve 5 and the oil return opening of uninstallation solenoid valve 6 connect the oil tank through same oil return line. The oil pump 4 is connected with the oil tank through an oil inlet filter 8 on an oil inlet pipeline, and an oil inlet one-way valve 9 connected with the oil inlet filter 8 in parallel is arranged on the oil inlet pipeline. In addition, the oil return pipeline is connected to the oil tank through an oil return filter 10, and the oil return pipeline is provided with an oil return one-way valve 11 connected with the oil return filter 10 in parallel.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A bidirectional balanced valve type buffer system for an aircraft tractor cab comprises a lifting oil cylinder (1) and a lifting control electromagnetic valve (2) which are connected through a hydraulic pipeline, wherein the lifting control electromagnetic valve (2) is of a three-position four-way structure; the hydraulic balance valve is characterized in that a bidirectional balance valve (3) is arranged on the hydraulic pipeline.

2. The bidirectional balanced valve type buffer system for the aircraft tractor cab according to claim 1, wherein the lift control solenoid valve (2) is connected with an oil pump (4) through an oil supply pipeline, the oil supply pipeline is further provided with an overflow valve (5) and an unloading solenoid valve (6) which are arranged in parallel with the lift control solenoid valve (2), the unloading solenoid valve (6) is composed of a two-position two-way on-off valve, and oil return ports of the overflow valve (5) and the unloading solenoid valve (6) are connected with an oil return tank through the same oil return pipeline.

3. The bi-directional balanced valve-type cushioning system for aircraft tractor cabs according to claim 2, characterized in that the oil pump (4) is connected to the oil tank through an oil inlet filter (8) on the oil inlet line.

4. The bidirectional balanced valve type buffer system for the cab of the aircraft tractor according to claim 3, wherein an oil inlet check valve (9) connected in parallel with the oil inlet filter (8) is arranged on the oil inlet pipeline.

5. The bi-directional balanced valve cushioning system for aircraft tractor cabs according to claim 2, characterized in that the return line is connected back to the oil tank via a return filter (10).

6. A bi-directional balanced valve-type cushioning system for aircraft tractor cabs according to claim 5, characterized in that the return line is provided with a return check valve (11) in parallel with the return filter (10).

7. A two-way balanced valve type cushioning system for an aircraft tractor cab according to any one of claims 1 to 6, characterized in that a one-way throttle valve (7) is provided on a hydraulic line connecting the lift cylinder (1).