Combined type digital valve with loading port independently controlled and method thereof

Abstract

The invention discloses a combined type digital valve with a loading port independently controlled and a method thereof. The combined type digital valve comprises a valve block, a plurality of switch valves, a loading port pressure sensor A and a loading port pressure sensor B; a threaded hole is formed in each of the four surfaces of the valve block, the threaded hole P and the threaded hole T are arranged oppositely, and the threaded hole A and the threaded hole B are arranged oppositely. According to the valve, by combining and applying the high-speed switch valves, when one cartridge valve is broken down, users just need to replace the cartridge valve broken down, there is no need to replace the whole combination unit of the digital valve, and therefore the maintenance cost and the replacement cost can be lowered, and the production cost can be greatly lowered; the loading port is independently controlled, and therefore the system control freedom degree is improved, and further improvements of the control performance and the energy conservation performance of engineering machinery become possible. By combining and applying the high-speed switch valves, when one or more cartridge valves are broken down, the other cartridge valves can still work normally, and therefore the influence to controlled objects is lowered to the minimum level.

Description

technical field [0001] The invention relates to a combined digital valve independently controlled by a load port and a method thereof. Background technique [0002] Electro-hydraulic proportional control technology is an important branch of electro-hydraulic control technology. It has developed rapidly in the past 30 years and has been widely used in civil, industrial and military machinery industries. However, the control of the electro-hydraulic proportional valve is complicated, and the dead zone needs to be compensated, the hysteresis is large, and the frequency response is low; the traditional electro-hydraulic proportional valve is controlled by a spool, and the inlet and outlet of the valve are linked. Relationship. For systems that do not require oil return back pressure, traditional proportional valves cannot independently adjust the pressure at the inlet and outlet of the valve, resulting in a waste of energy. As an emerging hydraulic technology, the load port in...

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Problems solved by technology

[0004] In practical application, many occasions have high requirements on the output accuracy of the flow rate. Because the conventional on-off valve only has two states of open and closed, the flow resolution is low, which cannot meet the occasions that require high flow resolution.

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