Scissors fork type aerial work platform and hydraulic system thereof

Abstract

The invention discloses a hydraulic system. The hydraulic system comprises floating oil cylinders, balance valves and reversing valves, wherein the balance valves are used for conveying oil to cavities of the floating oil cylinders, and the reversing valves are connected with the balance valves. The reversing valves are connected with an oil supply pump, wherein the oil supply pump supplies oil tothe reversing valves. The hydraulic system further comprises a walking system oil supply opening, wherein the walking system oil supply opening supplies oil to the reversing valves. The reversing valves are connected with the walking system oil supply opening through a first one-way valve and connected with the oil supply pump through a second one-way valve. According to the hydraulic system, main oil supply operation is conducted on the floating oil cylinders in the system through the walking system oil supply opening, subsidiary oil supply operation is conducted on the floating oil cylinders in the system through the oil supply pump, and thus oil supply operation of the floating oil cylinders can be mainly obtained from a walking system; the oil is supplied through the oil supply pump,the flow at one side can be decreased to small flow state, and the continuous flow high-pressure overflowing situation can be avoided; and efficiency is obviously improved. The invention further discloses a scissors fork type aerial work platform including the hydraulic system.

Description

technical field [0001] The present invention relates to the technical field of hydraulic control, and more specifically, relates to a hydraulic system. In addition, the present invention also relates to a scissor type aerial work platform comprising the above-mentioned hydraulic system. Background technique [0002] When the scissor is walking on uneven roads, in order to improve the stability and comfort of the vehicle, the left and right tires need to automatically adjust the height according to the road conditions to compensate for the impact of uneven road surfaces. [0003] Now it is generally adopted that two floating oil cylinders are connected in parallel and equipped with a balance valve. Through the flow control valve, one pressure oil is preferentially drawn from the pump into the floating oil cylinder, so as to realize automatic compensation for uneven road surfaces during walking. [0004] In the diesel scissors of the prior art scheme, the oil of the functiona...

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Problems solved by technology

[0004] In the diesel scissors of the prior art scheme, the oil of the functional control pump is supplied to the floating valve block under the running condition, and most of the time the entire flow of the functional control pump is supplied to the floating valve block, and flows back to the oil tank through the low-pressure relief valve , the energy provided by the oil pump is all used to heat and do useless work, which is not conducive to the improvement of system efficiency and unfavorable high-temperature environment for long-term work. Therefore, it is usually necessary to increase the radiator, but this will not be conducive to the control of system costs.

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