Engineering machinery, hydraulic control system and method of multi-execution mechanism

Abstract

The invention provides a hydraulic control system and method of a multi-execution mechanism. The hydraulic control system comprises a hydraulic source, a flow control element, a multi-way directional valve and a control device, wherein the hydraulic source supplies oil to the multi-way directional valve through an oil inlet way, the multi-way directional valve controls the multi-execution mechanism to act and carries out oil return through an oil return way, the oil inlet of the flow control element is communicated with the oil inlet way, the oil outlet of the flow control element is communicated with the oil return way, a control oil port is communicated with a control oil way, and the control oil way feeds back the highest working pressure of the multi-execution mechanism to the control oil port of the flow control element. The invention also provides engineering machinery comprising the hydraulic control system. According to the invention, two operation modes of remote control operation and manual control operation can be implemented, energy loss and system heat dissipation of the system can be effectively reduced, the response of the system is more rapid, and the service life of the system is longer.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a hydraulic control system and control method of multiple actuators, and construction machinery including the hydraulic control system. Background technique [0002] Concrete distribution equipment, such as concrete pump trucks, distribution booms, etc., use multi-way reversing valves to control the actions of multiple actuators such as booms. When this type of equipment is actually used, the common operation method is to use the remote controller to control the action of multiple actuators such as the boom. The action of multiple actuators such as booms. [0003] At present, this type of construction machinery usually uses a load-sensitive hydraulic control system with a load-sensitive variable pump matched with a multi-way reversing valve to realize the action of multiple actuators. The above load-sensitive hydraulic control system adjusts the supply flow rate of th...

AI Technical Summary

Problems solved by technology

[0004] First of all, in the load-sensing hydraulic control system, the load-sensing variable pump must be adjusted according to a certain pressure difference preset on both sides of the multi-way reversing valve spool, and the preset pressure difference must exist, resulting in system energy loss , high calorific value;

[0005] Secondly, in the load-sensing hydraulic control system, whether it is due to the change of the load of the multi-actuator or the change of the speed of the multi-actuator, the variable adjustment mechanism of the load-sensing variable pump will be adjusted, resulting in the load-sensing variable pump. damage;

[0006] Thirdly, in the load-sensing hydraulic control system, the control oil channel must first transmit the highest load working pressure to the load-sensing variable pump of the supply flow, and the supply flow can only be output after being adjusted by the pump’s regulating mechanism, thereby adjusting the flow of the entire system. Flow and pressure, resulting in slow system response

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