A stage-opened balance valve

Abstract

The invention discloses a balance valve to open in phases. The balance valve to open in phases comprises a valve body, and a valve core arranged in the valve body, wherein a transition plate is fixed on the valve body; a liquid control one-way valve is mounted on the transition plate; an oil port A and an oil port B communicated with the transition plate are formed in the valve body; the oil port B is communicated with a cavity b of the liquid control one-way valve; damping for adjusting an oil passing quantity is arranged between the oil port B and the cavity b of the liquid control one-way valve; a cavity a of the liquid control one-way valve is communicated with the oil port A of the valve body; a Pp port connected with a pilot oil source Pp is formed in the transition plate; a Px port connected with a control oil source Px is formed in the valve body; and the opening pressure of the liquid control one-way valve is lower than the opening pressure of the valve core. The balance valve to open in phases has the following advantages: through the setting of the liquid control one-way valve, oil passes through the liquid control one-way valves at the beginning of variable amplitude dropping of the balance valve, and an oil cylinder is slowly put down to effectively eliminate the impact; after the pressure is built, the dropping speed of the variable amplitude oil cylinder is accelerated; and the balance valve to open in phases is simple and reasonable in structure form, convenient for installation and low in cost.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a balance valve applied in a hydraulic system of a crane, in particular to a balance valve opened in stages. Background technique [0002] With the continuous development of my country's truck crane industry and the continuous improvement and perfection of crane performance, the hydraulic system is also constantly updated. high demands. [0003] In modern construction machinery, construction machinery and other engineering equipment, the hydraulic load-bearing system has become the main application object, and the balance valve is the key hydraulic component of this type of system, and its performance directly affects the performance of the whole machine. With the development of the national economy and the increasing requirements and difficulties of the operation of the hydraulic machinery industry, customers have reached a new height in the performance and functional diver...

AI Technical Summary

Problems solved by technology

However, with this control method, the opening pressure of the balance valve is relatively high, and the oil cylinder will have a downward impact at the moment when the amplitude drop is opened.

Therefore, most cranes on the market will have an impact at the moment of luffing and falling, causing the boom to shake; this impact will cause certain damage to the boom structure of the crane and the performance of the luffing cylinder

Now this kind of distance error is usually compensated by the operator's operating skills, which increases the difficulty of the operation and also causes instability and danger in the work.

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