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Hydraulic system for construction machinery and construction machinery

A hydraulic system and construction machinery technology, applied in the direction of mechanical equipment, fluid pressure actuators, servo motors, etc., can solve the problems of slow system response, complicated matching and debugging, and inability to adjust well, so as to achieve fast system response, Good synchronous control and fast response effect

Active Publication Date: 2020-03-10
WEICHAI POWER CO LTD +1
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AI Technical Summary

Problems solved by technology

Under steady-state working conditions, on-demand supply and flow adjustment can be well realized, but under fast dynamic working conditions, the system responds slowly and cannot be well adjusted, and it is very prone to pressure shocks, and matching and debugging are more complicated

Method used

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  • Hydraulic system for construction machinery and construction machinery

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Embodiment Construction

[0034] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] According to the embodiment of the present invention, such as figure 1 As shown, a hydraulic system with a positive flow pump equipped with a load sensing valve for construction machinery is proposed. a plurality of actuators 3, a main valve group for distributing flow for multiple actuators, corresponding multiple manipulation mechanisms 6 corresponding to multiple actuators operated by the driver, an electronic control uni...

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Abstract

The invention provides a hydraulic system for engineering machinery and the engineering machinery provided with the hydraulic system. The hydraulic system comprises a main pump for providing hydraulicoil to the hydraulic system in a positive flow control manner, multiple actuation mechanisms, a main valve set comprising multiple main valve elements and multiple pressure compensators, multiple operation parts for respectively inputting pilot pressure to the corresponding main valve elements, an electric control unit for storing flow characteristic curves corresponding to the multiple main valve elements, and multiple pressure sensors. The multiple pressure sensors are connected with the electric control unit for detecting the pilot pressure input by the corresponding operation parts and inputting pilot pressure signals to the electric control unit; the electric control unit calculates flows needed by all the corresponding main valve elements according to the pilot pressure values detected by the multiple pressure sensors based on the self-stored corresponding flow characteristic curves, and a total flow needed by the hydraulic system is calculated; and the main pump outputs corresponding displacement based on the total flow through the positive flow control mode.

Description

technical field [0001] The invention relates to the field of hydraulic control, in particular to a hydraulic system for construction machinery and construction machinery equipped with the hydraulic system. Background technique [0002] Modern construction machinery, such as excavator hydraulic systems, have two mainstream technical routes, namely positive flow throttling control system (referred to as positive flow system) and load sensing pressure compensation system (referred to as load sensing system). [0003] Positive flow systems usually use throttling and speed regulation multi-way directional valves to match proportional control pumps. The highest value is selected through the pilot pressure shuttle valve group to control the flow of the main pump. The response of the system is fast, but the pump control signal generation device is complicated. The flow rate cannot be accurately matched with the system demand, the main valve adopts throttling speed regulation, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/16
CPCF15B11/16F15B2211/205
Inventor 杨国玺胡彦龙赵翀
Owner WEICHAI POWER CO LTD
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