Load-sensing control system, control method thereof, and hydraulic equipment having the same
A technology of load-sensing control and control unit, which is applied in the direction of mechanical equipment, fluid pressure actuators, servo motor components, etc., and can solve problems such as adjusting the output of hydraulic pumps, heating of hydraulic oil, and waste of output power of load-sensing control systems. Achieve the effect of no waste of power and high efficiency
Active Publication Date: 2017-10-31
ZOOMLION HEAVY IND CO LTD
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Problems solved by technology
[0003] However, if the oil supply pipe of the hydraulic system is long or has many bends, there will be a certain pressure loss between the outlet of the oil pump and the oil inlet of the load, and the load sensitive control system in the prior art cannot be adjusted according to the size of the pressure loss. The output of the hydraulic pump, so in order to ensure the normal operation of the hydraulic system, the load-sensing control system needs to be set according to the maximum value of the pressure loss
In this way, if the working state of the hydraulic system does not reach the maximum pressure loss, part of the output power of the load-sensitive control system will be wasted, and the wasted power will also cause the hydraulic oil to heat up, which will adversely affect the normal operation of the hydraulic system.
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[0024] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0025] According to one aspect of the present invention, a load sensing control system is provided, such as figure 1 As shown, the load sensing control system includes: a main pump device 10, which provides power to the load circuit; a detection part, which is electrically connected to the load circuit to detect the flow rate and feedback pressure of the load circuit; a control part 20, which is electrically connected to the detection part to The flow in the load circuit and the feedback pressure control the output pressure and / or output flow of the main pump unit 10 .
[0026] When the flow rate of the hydraulic system is greater, the total pressure loss of the pipeline is greater. The load s...
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The invention provides a load-sensitive control system and a control method thereof as well as a hydraulic apparatus with the system. The load-sensitive control system comprises a main pump device for providing power for a load circuit, a detection part electrically connected with the load circuit to detect the flow and the feedback pressure of the load circuit, and a control part electrically connected with the detection part to control the output pressure and / or the output flow of the main pump device according to the flow and the feedback pressure of the load circuit. The load-sensitive control system is capable of supplementing pressure loss in a pipeline by detecting the flow of the load circuit and adjusting the output pressure of the main pump device according to the flow; as a result, when the flow in the load circuit is relatively low, the work applied by the main pump device to supplement the pressure loss is also relatively low and the power is not wasted as much as possible; in this way, the load-sensitive control system is higher in efficiency, and more energy-saving and environment friendly, and is especially suitable for hydraulic systems having relatively high pressure loss between pipelines and relatively high working flow change of the system.
Description
technical field [0001] The invention relates to the field of hydraulic control, in particular to a load sensitive control system and its control method, and hydraulic equipment with the system. Background technique [0002] In the prior art, in order to more accurately control the output power of the hydraulic system of construction machinery, the hydraulic system adopts a load-sensing control system, that is, the output of the hydraulic pump can be adjusted according to the load of the load to achieve precise control and save energy. . [0003] However, if the oil supply pipe of the hydraulic system is long or has many bends, there will be a certain pressure loss between the outlet of the oil pump and the oil inlet of the load, and the load sensitive control system in the prior art cannot be adjusted according to the size of the pressure loss. The output of the hydraulic pump, so in order to ensure the normal operation of the hydraulic system, the load-sensing control syst...
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IPC IPC(8): F15B13/02F15B13/16
CPCF15B13/02F15B13/16
Inventor 胡国庆郭堃
Owner ZOOMLION HEAVY IND CO LTD