Electromagnetic switch hydraulic multitandem valve control device

Abstract

The invention relates an electromagnetic switch hydraulic multi-way valve control device based on the segmented current negative feedback principle, belonging to the hydraulic pressure control electric circuit field. The device mainly comprises a segmented electric current generating circuit, an electric current regulating circuit, a pulse-width modulation electric circuit, a power driving circuit and an electric current negative feedback electric circuit. Compared with the prior art, the invention adopts segmented current control which eliminates easy jam and lock phenomenon when an electromagnetic valve is just opened and guarantees the opening reliability; the invention makes power amplification electric circuit work in on-off state all the time by pulse-width modulating, which decreases heat productivity of electric circuit, is favorable for saving energy and enhances working stability; and the invention, by means of current negative feedback, eliminates oscillation of a valve core which effectively decreases the temperature of system oil, realizes energy conservation and increases operational stability of multi-way valves.

Description

technical field [0001] The invention relates to a control device for an electromagnetic switch hydraulic valve, in particular to an electromagnetic switch hydraulic multi-way valve control device based on the principle of segmental current negative feedback, and belongs to the technical field of hydraulic control circuits. Background technique [0002] The electromagnetic switch hydraulic multi-way valve is the basic component of hydraulic transmission and control, and is widely used in various walking hydraulic control systems (such as various construction machinery, engineering vehicles, etc.). In the traditional electromagnetic switch hydraulic multi-way valve, each electromagnetic switch valve, especially the single electromagnetic switch valve, has the following problems for a long time due to the use of the switch circuit as the control device [0003] 1. Poor working reliability and stability; [0004] Due to the influence of manufacturing and processing precision an...

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Problems solved by technology

[0003] 1. Poor working reliability and stability;

[0004] Due to the influence of manufacturing and processing precision and the degree of oil pollution, the static friction force that the electromagnetic switch hydraulic valve needs to overcome when it is opened is relatively large, and the characteristics of the switch electromagnet are: when it is just opened, the air gap is large when it is working, so the thrust of the electromagnet As a result, the solenoid valve is prone to jamming and jamming when it is just opened, which affects the reliability of the system; after the solenoid valve is fully opened and enters the holding state, only a small electromagnetic thrust can overcome hydraulic forces and other forces At this time, due to the small working air gap of the electromagnet, the electromagnetic thrust provided is much greater than the hydraulic power, and the electromagnetic performance of the electromagnet cannot be reasonably used; in addition, due to the fluctuation of the power supply voltage and the influence of other external factors, the switching electromagnet The drive current is easily disturbed, and it is also easy to cause the instability of the switch electromagnet thrust, which affects the stability of the system.

[0005] 2. The electromagnet consumes a lot of power and generates serious heat

Because the driving current required by the solenoid switch hydraulic valve is much smaller than the driving current when it is fully opened and maintained, the result is large power consumption and serious heat generation of the solenoid valve, which directly affects the service life of the switch electromagnet.

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