Hydraulic speed control system and construction machinery

A technology of speed regulation system and construction machinery, which is applied in the direction of mechanical equipment, transmission devices, belts/chains/gears, etc., can solve problems such as the inability to realize flow adaptive proportional distribution, and achieve the overall efficiency of commission, stable and soft speed regulation characteristics, The effect of reducing response time

Active Publication Date: 2019-07-30
WEICHAI POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The disadvantage is that the adaptive proportional distribution of flow cannot be realized in the multi-actuator system

Method used

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  • Hydraulic speed control system and construction machinery

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Embodiment Construction

[0027] 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.

[0028] According to the embodiment of the present invention, such as figure 1 As shown, a hydraulic speed control system capable of mixed control for engineering machinery is proposed, the hydraulic speed control system includes: a main pump 1 connected to the oil tank to provide hydraulic oil for the hydraulic speed control system, an actuator 3, and a The main valve 2 for distributing flow for the execution structure, the operati...

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Abstract

The invention relates to a hydraulic speed regulating system and an engineering machine with the same. The hydraulic speed regulating system comprises a main pump, a plurality of executing mechanisms, a main valve, a control component, a proportion displacement controller, a load sensing controller and a speed regulating mode switching component, wherein the main pump is connected with an oil tank and used for providing hydraulic oil for the hydraulic speed regulating system; the main valve is connected with the main pump and the executing mechanisms; the control component is used for inputting pilot pressure to the main valve; the proportion displacement controller is used for performing proportion regulation on the displacement of the main pump by controlling an input signal; the load sensing controller is used for regulating the displacement of the main pump in a mode of load sensing control of keeping the difference between former pressure and later pressure of the main valve to be constant; and the speed regulating mode switching component is used for switching between a volume throttling speed regulating control mode and a volume speed regulating mode according to specific conditions. In the volume throttling speed regulating control mode, the main pump achieves flow regulation through the load sensing controller in the mode of load sensing control, and in the volume speed regulating mode, the main pump achieves flow regulation through the electric proportion displacement controller in a mode of positive flow control.

Description

technical field [0001] The invention relates to the field of hydraulic control, in particular to a hybrid control hydraulic speed regulating system. Background technique [0002] The hydraulic system of modern construction machinery is usually divided into open system or closed system. The closed system adopts volumetric speed regulation control, that is, the system speed is adjusted by controlling the displacement of the main pump. The open system is divided into a variable open system and a quantitative open system. The quantitative open system is a throttling speed regulation system, that is, a quantitative pump is used to adjust the speed through the directional valve throttling, and the excess flow is unloaded through the bypass overflow . The variable open system generally adjusts the displacement of the main pump by throttling the main valve to generate control pressure to achieve on-demand supply flow to avoid bypass overflow loss, that is, volumetric throttling sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H39/06F16H39/20
CPCF16H39/06F16H39/20
Inventor 杨国玺
Owner WEICHAI POWER CO LTD
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