Hydraulic system with flow compensation function and engineering machinery

Abstract

The invention relates to a hydraulic system with a flow compensation function and engineering machinery provided with same. The hydraulic system comprises a main pump which is connected with an oil tank and controlled in a load sensing mode, actuating mechanism, a main control valve which is connected with the main pump and the actuating mechanism and used for distributing hydraulic oil for the actuating mechanism, a pilot pressure input part which is connected with the main control valve so as to input pilot pressure to the main control valve, and a flow compensation mechanism, wherein the flow compensation mechanism comprises a compensation pressure input part and a flow compensation valve block; the compensation pressure input part is used for inputting constant compensation pressure to the flow compensation valve block; and the flow compensation valve block is connected with the pilot pressure input part, the compensation pressure input part, a load pressure output pipeline of the main control valve and a displacement adjusting mechanism of the main pump and used for receiving the compensation pressure and the load pressure under the condition that the pilot pressure input part inputs the pilot pressure and inputting the higher one of the compensation pressure and the load pressure to the main pump so as to control the displacement of the main pump.

Description

technical field

[0001] The invention relates to the field of hydraulic technology, in particular to a hydraulic system with a flow compensation function and construction machinery equipped with the hydraulic system. Background technique

[0002] Load sensing control is a common control method for controlling the displacement of main pumps in modern construction machinery. The so-called load sensing control is to control the displacement of the main pump by detecting the pressure difference before and after the main control valve, and maintain a constant pressure difference before and after the main control valve, so as to realize the discharge flow of the main pump according to the system demand. In the load sensing control system, the displacement adjustment mechanism of the main pump, such as the swash plate variable mechanism of the main pump, receives the signal from the load to adjust the displacement of the main pump in real time. However, in some working conditions, ...

Examples

Embodiment Construction

[0022] 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.

[0023] According to an embodiment of the present invention, a hydraulic system with flow compensation function for engineering machinery is proposed, such as figure 1 As shown, the hydraulic system includes: a main pump 1 connected to the oil tank to provide hydraulic oil for the hydraulic system in a load sensing controlled manner, an actuator 3, a main control valve 2, and a pilot valve for inputting the main control valve 2 Pres...

technical field

[0001] The invention relates to the field of hydraulic technology, in particular to a hydraulic system with a flow compensation function and construction machinery equipped with the hydraulic system. Background technique

[0002] Load sensing control is a common control method for controlling the displacement of main pumps in modern construction machinery. The so-called load sensing control is to control the displacement of the main pump by detecting the pressure difference before and after the main control valve, and maintain a constant pressure difference before and after the main control valve, so as to realize the discharge flow of the main pump according to the system demand. In the load sensing control system, the displacement adjustment mechanism of the main pump, such as the swash plate variable mechanism of the main pump, receives the signal from the load to adjust the displacement of the main pump in real time. However, in some working conditions, ...

Examples

Embodiment Construction

[0022] 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.

[0023] According to an embodiment of the present invention, a hydraulic system with flow compensation function for engineering machinery is proposed, such as figure 1 As shown, the hydraulic system includes: a main pump 1 connected to the oil tank to provide hydraulic oil for the hydraulic system in a load sensing controlled manner, an actuator 3, a main control valve 2, and a pilot valve for inputting the main control valve 2 Pres...

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