Manifold truck and its hydraulic control system

Abstract

The invention discloses a manifold car and its hydraulic control system. In the present invention, the first reversing valve is used to connect the oil outlet of the boom pump to the oil inlet of the boom hydraulic unit, or to connect to one of the pressure test main valve and the oil inlet of the filling motor; The two reversing valves are used to connect the oil outlet of the outrigger pump to the oil inlet of the outrigger hydraulic unit, or to the other of the pressure test main valve and the oil inlet of the filling motor; the two ports of the pressure test main valve The two working oil ports are respectively connected to the rodless cavity and the rod cavity of the oil cylinder, and the oil return port of the pressure test main valve is connected to the oil return circuit. The pressure test main valve is used to realize the telescopic reversing or locking of the oil cylinder; The extended end of the piston rod is provided with a plug body, which is movably arranged in the pressurized cylinder, and the rodless chamber of the pressurized cylinder is connected with a suction valve and a discharge valve; the oil outlet of the filling motor is connected to the oil return circuit. The implementation of the present invention not only saves occupied space, is energy-saving and economical, but also is easy to arrange and maintain, and facilitates centralized coordinated control.

Description

technical field [0001] The invention relates to the technical field of manifold trucks, in particular to a manifold truck and its hydraulic control system. Background technique [0002] In fracturing construction operations, a manifold truck is often used, which is usually composed of a chassis, a truck-mounted hoisting system (including the boom part and outrigger part), an irrigation system (including an irrigation pump and an irrigation motor), a pressure test The system (including the pressure test pump) and various manifold components, etc., the manifold components generally include high and low pressure manifolds and high and low pressure fittings, high pressure fitting racks, high pressure fitting boxes, low pressure fitting boxes, etc. During use, after the manifold truck arrives at the site, various manifold components can be hoisted and unloaded to the ground through its on-board hoisting system. After the manifold components are assembled to form a manifold system...

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Problems solved by technology

[0004] As we all know, generally speaking, the larger the space for arranging various manifold parts on the chassis of the manifold truck, the better, so the space occupied by other components is relatively limited, but in the hydraulic control system of the above-mentioned manifold truck, There are many components required, the structure is complex, the space occupied is large, the cost is high, the energy consumption is high, and each part is relatively independent, which makes it inconvenient to arrange and maintain, and it is not convenient for centralized coordination and control; in addition, the existing perfusion method is comparatively Single, it is difficult to adapt to the perfusion needs of manifold systems of different scales, and the process of pressure testing through plunger pumps is also inconvenient and complicated

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