阅读说明：本技术 一种备胎升降液压系统及平地机 (Spare tire lifting hydraulic system and land leveler ) 是由 张俊 梁帮修 范杨 胡民政 田瑞 田建福 卜令臣 司青云 于 2020-06-30 设计创作，主要内容包括：本发明公开了一种备胎升降液压系统及平地机,属于工程机械的电液控制领域,该系统包括有电动机、齿轮泵、溢流阀、单向阀、二位四通换向阀、单向节流阀、通断阀、备胎升降油缸、液压油箱,通过各元件的连接,形成备胎升降液压系统,通过对该系统进行电气控制,实现车辆维修性能的便利,取代传统的人工机械工作,为平地机更换备胎提供便捷,减少给工程带来的损失。(The invention discloses a spare tire lifting hydraulic system and a land leveler, belonging to the field of electro-hydraulic control of engineering machinery.)

1. A spare tire lifting hydraulic system is characterized by comprising a hydraulic oil tank (10), a gear pump (2), a one-way valve (4), a two-position four-way reversing valve (5), a one-way throttle valve (6), an on-off valve (7) and a spare tire lifting oil cylinder (8),

an oil return port of the gear pump (2) is connected with an oil inlet of the one-way valve (4), the oil inlet is connected with the hydraulic oil tank (10), and the gear pump (2) is also connected with the motor (3);

an oil inlet of the two-position four-way reversing valve is connected with an oil return port of the one-way valve (4), the oil return port is connected with a hydraulic oil tank (10), and an opening A, B of the two-position four-way reversing valve is respectively connected with an oil inlet of the one-way throttle valve (6) and a rod cavity of the spare tire lifting oil cylinder (8);

an oil inlet of the on-off valve (7) is connected with an oil return port of the one-way throttle valve (6), and the oil return port is connected with a rodless cavity of the spare tire lifting oil cylinder (8).

2. A spare wheel lifting hydraulic system according to claim 1, characterized in that the two-position four-way reversing valve (5) is an electromagnetic reversing valve.

3. The spare tire lifting hydraulic system according to claim 1, characterized in that the system further comprises an overflow valve (9), wherein an oil return port of the overflow valve (9) is connected with a hydraulic oil tank (10), and an oil inlet of the overflow valve (9) is connected with an oil return port of the gear pump (2).

4. The spare tire lifting hydraulic system according to claim 1, characterized in that the system further comprises a filter (1), an oil return port of the filter (1) is connected with an oil inlet of the gear pump (2), and the oil inlet is connected with the hydraulic oil tank (10).

5. A spare tyre lifting hydraulic system as claimed in claim 1, characterized in that the one-way throttle valve (6) is a variable throttle valve.

6. A spare wheel lifting hydraulic system according to claim 1, characterized in that the control electric signals of the two-position four-way reversing valve (5) and the on-off valve (7) are PWM signals.

7. A grader comprising a spare wheel lift hydraulic system according to any of claims 1 to 6.

Technical Field

The invention particularly relates to a spare tire lifting hydraulic system and a land leveler, and belongs to the technical field of electro-hydraulic control of engineering machinery.

Background

With the increasing requirements of labor cost, mining efficiency, personal safety and the like, more and more mining industries have great demands on unmanned fully mechanized mining, and under the chance, one batch of unmanned mining trucks drives into iron mine areas operated by Australian force, must and must, FMG and the like, and drives into oil mine areas operated by Canada Senko energy sources and the like. In these open mines, the grader serves as an important auxiliary equipment to clean and level the road surface so that other equipment can normally pass.

The replacement of spare tires of the existing land leveller is mostly the working process of the traditional manual mechanical transportation-replacement-transportation, and along with the increasing maturity of technologies such as an artificial intelligence technology, an internet of things technology, big data acquisition and analysis, more and more mining mechanical equipment can realize unmanned driving. The frequent reciprocating motion of the grader during operation determines the service life of the tire, the tire is indispensable as an important execution element, the convenience of replacing the tire directly influences the maintenance efficiency of the whole machine, and the safety of people and property is also concerned. Therefore, in the future to realize unmanned driving of a motor grader, the spare tire lifting system is the direction in which intensive research is to be conducted.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a spare tire lifting hydraulic system and a land leveler, which can quickly replace tires, replace the working process of carrying and replacing spare tires by traditional manual machinery, and reduce the loss brought to engineering.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

compared with the prior art, the invention has the following beneficial effects:

after receiving the power of the motor, the gear pump of the invention supplies pressure oil to the two-position four-way reversing valve 5, the two-position four-way reversing valve 5 realizes the extension and retraction of the piston rod of the oil cylinder through reversing, thereby realizing the lifting action of the spare tire, realizing the convenience for replacing the spare tire of a vehicle, being capable of rapidly replacing the tire in the sudden situation of tire burst and reducing the loss brought to the engineering.

Drawings

Fig. 1 is a schematic diagram of a spare tire lifting hydraulic system according to an embodiment of the invention.

In the figure: 1. a filter; 2. a gear pump; 3. an electric motor; 4. a one-way valve; 5. a two-position four-way reversing valve; 6. a one-way throttle valve; 7. an on-off valve; 8. a spare tire lifting oil cylinder; 9. an overflow valve; 10. and a hydraulic oil tank.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Fig. 1 shows a schematic diagram of a spare tire lifting hydraulic system according to an embodiment of the present invention, in which a hydraulic oil tank 10 is connected to an oil inlet of a filter 1, an oil outlet of the filter 1 is connected to an oil inlet of a gear pump 2, pressure oil output by the gear pump 2 is respectively connected to oil inlets of a check valve 4 and an overflow valve 9, the check valve 4 is connected to an oil inlet of a two-position four-way directional valve 5, and an oil outlet of the overflow valve 9 is connected to the hydraulic oil tank 10, so as to achieve oil return. Pressure oil output by the two-position four-way reversing valve 5 enters a rod cavity or a rodless cavity of the spare tire lifting oil cylinder 8 through the one-way throttle valve 6 and the on-off valve 7 respectively, and finally a complete spare tire lifting hydraulic loop is formed.

One end of the filter 1 is connected with the gear pump 2, and the other end is connected with the hydraulic oil tank 10. One end of the gear pump 2 is connected with the filter 1, the other end of the gear pump is respectively connected with a P port of the overflow valve 9 and a P port of the check valve 4, a T port of the overflow valve 9 is connected with a hydraulic oil tank 10, a T port of the check valve 4 is connected with a P port of the two-position four-way reversing valve 5, a T port of the two-position four-way reversing valve 5 is connected with the hydraulic oil tank 10, an A, B port of the two-position four-way reversing valve 5 is respectively connected with a P port of the check throttle valve 6 and a rod cavity of the spare tire lifting oil cylinder 8, a T port of the check throttle valve 6 is connected with a P port of the on-off valve 7, a T port of the check throttle valve is connected with a rodless cavity of the spare tire lifting oil cylinder 8, the check throttle valve 6 is a variable throttle valve.

The motor 3 works through an electric signal provided by the outside, the gear pump 2 starts to work when receiving the power of the motor 3, hydraulic oil is provided for the two-position four-way reversing valve 5, the two-position four-way reversing valve 5 realizes the extension and contraction of a piston rod of the oil cylinder 8 through reversing, and then the spare tire is lifted.

Under normal conditions, a spare tire connected with the oil cylinder 8 is in a high position, a locking function is realized through the one-way valve 4 and the on-off valve 7, when the spare tire needs to be used, an electromagnetic signal is sent to the two-position four-way reversing valve 5 and the on-off valve 7, a piston rod contracts, and the spare tire is lowered; when the lifting device is not used, the on-off valve 7 is electrified, and hydraulic oil enters the large cavity of the oil cylinder 8 to realize the lifting function.

The specific working process of the spare tire lifting hydraulic system is as follows: