Hydraulic system of mechanically operated triple pump

Abstract

The invention relates to a hydraulic system of a mechanically operated triple pump, comprising a first oil pump, a second oil pump, a third oil pump, a rotary hydraulic system, a boom expansion hydraulic system, a safe unloading hydraulic system, a lifting hydraulic system, a boom amplitude hydraulic system and a decompression pilot oil-source valve group; the opening and closing characteristics of a rotary brake and main and accessory hoisting brakes all adopt a constant-pressure oil-source control mode and intelligently and automatically control the brakes according to the operation of various actions without the need of additional external force operation; according to the different opening and closing characteristics of each mechanism, a rotary structure is in a quick-opening slow-closing control mode, main and accessory hoisting mechanisms are in a slow-opening quick-closing control mode, and the pressure impaction of the system is effectively eliminated, an overflow valve of each working port of a flow distribution valve and overflow valves of two oil-inlet working ports are provided with remote-control oil ports, are connected with a system unloading valve group and directly solve a safety control problem on a main valve; and in a complete vehicle system, elements are highly integrated and modularized, thereby reducing pipelines of the complete vehicle system and being convenient for maintenance.

Description

technical field [0001] The invention relates to the technical field of hydraulic systems, in particular to a mechanically operated triple-pump hydraulic system, which is suitable for on-board use of truck cranes, crawler cranes and truck-mounted cranes. Background technique [0002] During the working process of the crane, it is necessary to frequently complete the actions of lifting with load, slewing with load, lowering of heavy objects, luffing and return without load. In order to achieve efficient work, the crane needs to be able to perform compound actions, that is, the above two or more simultaneous Action, with the continuous development and progress of crane technology, the requirements for the safety control of each actuator, the opening and closing characteristics of each actuator and the high integration of the hydraulic system components of the vehicle are also getting higher and higher. [0003] At present, the hydraulic system of the crane adopts a multi-actuat...

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Problems solved by technology

[0003] At present, the hydraulic system of the crane adopts a multi-actuator parallel system, that is, the hydraulic oil source is connected in parallel to supply oil to multiple hydraulic actuators. When oil is needed, that is, when the flow rate of the valve is oversaturated, there will be pressure interference between multiple actuators connected in parallel, and the actuator with greater resistance will not be able to obtain the required oil flow, resulting in slow or even inoperable action.

At present, the safety direction control method of the hydraulic pilot operated truck crane basically adopts the combined control valve. This method causes the system pipeline to be huge and complicated, and it is difficult to troubleshoot and repair.

[0004] The opening and closing control of the brakes of the slewing mechanism, the main hoisting mechanism and the auxiliary hoisting mechanism are mostly directly controlled by the high-pressure oil in the working oil circuit. In the Tadano system in Japan, the brakes are mechanically operated by manually pulling the rod, and the brakes are normally open during work. , which will lead to reduced system efficiency and service life of components, complicated control, and increased operational fatigue

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