Sequential-control hydraulic system and control method thereof

Abstract

The invention discloses a sequential-control hydraulic system and a control method thereof. The hydraulic system comprises a plurality of working oil cylinder sub systems, wherein each working oil cylinder sub system comprises an oil cylinder and an oil supply device, a rodless cavity of the oil cylinder is connected to the oil supply device through a first oil supply tube, a rod cavity of the oilcylinder is connected to the oil supply device through a second oil supply tube; and a flow sensor is arranged on the first oil supply tube or the second oil supply tube of each working oil cylindersub system. The control method for the hydraulic system comprises the following steps: 1) mounting the hydraulic system; 2) controlling all working oil cylinder sub systems to start in sequence according to loss of a signal of the flow sensor; and 3) when all working oil cylinder sub systems are started, repeating the step 2), and driving the oil cylinder of each working oil cylinder sub system toreturn. Control of the hydraulic system disclosed by the invention is not affected by system pressure impact, and mounting of the hydraulic system is not limited by a motion mechanism structure, so that the sequential-control hydraulic system is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of hydraulic system control, in particular to a sequence control hydraulic system and a control method thereof. Background technique [0002] When multiple oil cylinders in the hydraulic system need to be controlled in sequence, the sequential action circuit can be divided into two categories: pressure control and stroke control according to the different control methods. The pressure control is realized through the sequence valve, which is connected in series with the oil circuit of the rear action cylinder. When the priority action cylinder moves to the end point, the system pressure rises, and when the pressure setting value of the sequence valve is reached, the oil circuit of the rear action cylinder will be connected, and the rear action cylinder will move. , the use of sequence valve control is susceptible to pressure interference, especially in the throttling debugging system. The priority action cyli...

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Problems solved by technology

[0004] The object of the present invention is to provide a sequential control hydraulic system and its control method, thereby overcoming the disadvantages that the sequence control hydraulic system adopts the pressure control sequence valve, which is easily subjected to pressure interference and misoperation, and the stroke control is easily restricted by the structure of the motion mechanism.

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