Double-cylinder synchronous control hydraulic system and engineering machinery

Abstract

The invention discloses a double-cylinder synchronous control hydraulic system which comprises a main reversing valve, a first oil cylinder and a second oil cylinder, wherein a first balance valve is arranged on an oil inlet path of a rodless cavity of the first oil cylinder, a second balance valve is arranged on an oil inlet path of a rodless cavity of the second oil cylinder, the first balance valve and the second balance valve are both pilot leakage balance valves, an oil control hole of the double-cylinder synchronous control hydraulic system is communicated with an oil inlet path of a rodless cavity of a corresponding oil cylinder, and an oil leakage hole of the double-cylinder synchronous control hydraulic system is communicated with an oil tank. The double-cylinder synchronous control hydraulic system further comprises a one-way throttle valve, an oil inlet of the one-way throttle valve is communicated with the main reversing valve, and an oil outlet of the one-way throttle valve is communicated with the oil inlets of the first balance valve and the second balance valve. Double hydraulic oil cylinders of the system can run synchronously, the model selection and parameters setting of hydraulic elements of the double hydraulic oil cylinders are easier, the cost is low, the realization is easy, and the complete machine debugging is relatively simple. The invention also discloses engineering machinery provided with the double-cylinder synchronous control hydraulic system.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a dual-cylinder synchronous control hydraulic system of engineering machinery. The invention also relates to construction machinery provided with the hydraulic system for synchronous control of twin cylinders. Background technique [0002] With the continuous development of construction machinery in the direction of large-scale, the load borne by its force-bearing parts is also increasing. In order to meet the load requirements, a double hydraulic cylinder structure is generally used. [0003] For example, the double-cylinder luffing system used in the luffing system of fire trucks. The use of dual hydraulic cylinders can increase power and ensure stability and safety during luffing and landing. However, due to the inherent characteristics of the balance valve itself, the hysteresis of the two luffing balance valves are different during luffing, which causes the oil pr...

AI Technical Summary

Problems solved by technology

However, due to the inherent characteristics of the balance valve itself, the hysteresis of the two luffing balance valves are different during luffing, which causes the oil pressure in the rodless chamber of the left and right luffing cylinders to be asymmetrical, and there is a large pressure difference between the left and right load ports. problem; the left and right luffing cylinders are tilted to one side under partial load, and the boom is difficult to fall into the boom bracket. When the partial load is severe, a series of serious accidents such as cylinder burst and rollover will occur

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