Movable arm control valve structure and excavator

Abstract

The invention relates to the technical field of excavators, and particularly discloses a movable arm control valve structure and an excavator. The movable arm control valve structure comprises a first control valve, a second control valve, a first one-way valve and a regeneration one-way valve; a first valve element of the first control valve is provided with a working position A1 capable of disconnecting a first pressure source, an oil return channel and a rod cavity and a rodless cavity of the movable arm oil cylinder and further provided with a working position A2 communicating the oil return channel with the rodless cavity of the movable arm oil cylinder and separating the first pressure source from the rod cavity of the movable arm oil cylinder. A second valve element of the second control valve is provided with a working position B1 for disconnecting a second pressure source, a rod cavity and a rodless cavity and further provided with a working position B2 for communicating the pressure source, the rod cavity and the rodless cavity at the same time, the second control valve is connected with the rod cavity through a regeneration oil way, a regeneration one-way valve is arranged on the regeneration oil way, and the regeneration one-way valve and the regeneration oil way are both located outside the two valve elements. The aperture of the regeneration oil way is not affected by the strength of the valve element, the aperture can be designed to be large, and when the regeneration flow is large, it can be guaranteed that the pressure loss of the oil way is small.

Description

technical field [0001] The invention relates to the technical field of excavators, in particular to a boom control valve structure and an excavator. Background technique [0002] The boom cylinder of the existing excavator is controlled by the boom control valve, and a regeneration circuit needs to be designed. The regeneration circuit needs to integrate a regeneration check valve in the spool of the boom control valve, and design a regenerative oil circuit inside the spool of the boom control valve. When the boom is lowered, the pressure on the side of the non-rod chamber is higher, and a part of the hydraulic oil returns to the side of the rod chamber through the regeneration check valve and the regeneration oil circuit, without passing through the main pump and the oil tank, which can reduce the number of times the main pump operates, and further Energy saving is achieved and efficiency can be improved. The regenerative oil circuit includes an axial hole inside the spoo...

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Problems solved by technology

[0003] The object of the present invention is to provide a boom control valve structure and an excavator to solve the problem that the regeneration check valve in the regeneration circuit of the existing boom cylinder is integrated in the main valve spool, and the regeneration oil circuit is also located in the boom. Inside the spool, the size of the regenerative oil circuit is limited by the strength of the spool, resulting in a large pressure loss in the oil circuit

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