A kind of pressure-changing energy-saving three-way proportional flow commutator

Abstract

The invention discloses a variable-pressure energy-saving three-way proportional flow reverser which comprises a hydraulic transformer, a valve plate corner oil cylinder, a corner control valve and a hydraulic drive proportional reversing valve. A port PA of the hydraulic transformer is connected with system oil supply. A port PB of the hydraulic transformer is connected with a port A of the hydraulic drive proportional reversing valve. A port PT is connected with an oil tank, and a valve plate corner mechanism of the hydraulic transformer is controlled by the valve plate corner oil cylinder. The hydraulic drive proportional reversing valve is a three-position four-way valve. A port B is connected with a piston cavity of a loading oil cylinder. A piston rod cavity of the loading oil cylinder is connected with the system oil supply. A port C and a port D are connected with two control oil ports of the corner control valve through throttling passageways correspondingly. The corner control valve is a three-position four-way proportional servo valve. A port E and a port F are connected with two control oil ports of the valve plate corner oil cylinder correspondingly. A port G is connected with the oil tank. A port H is connected with the system oil supply. According to the variable-pressure energy-saving three-way proportional flow reverser, under the condition that the valve port pressure difference is extremely small, proportional speed adjustment control can be achieved, and mechanical energy of loads can be recycled.

Description

technical field [0001] The invention relates to a pressure-changing energy-saving three-way proportional flow commutator, which belongs to hydraulic transmission and control technology. Background technique [0002] At present, hydraulic engineering machinery generally uses a manual pilot valve to control the proportional directional valve, and then the proportional directional valve controls the direction and speed of the load. If the supply pressure of the system is much higher than the load pressure, the oil will be throttled by the proportional reversing valve to a large pressure, resulting in a large power loss, the efficiency of the system is very low, and the temperature of the oil will rise. Equipped with a larger power cooling device to reduce the oil temperature to the range required by the system, which increases power consumption. [0003] Furthermore, because the load pressure and system pressure change with the load conditions, although the control signal of t...

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Problems solved by technology

If the supply pressure of the system is much higher than the load pressure, the oil will be throttled by the proportional reversing valve to a large pressure, resulting in a large power loss, the efficiency of the system is very low, and the temperature of the oil will rise. Equipped with high-power cooling equipment to reduce the oil temperature to the range required by the system, which increases power consumption

[0003] Furthermore, because the load pressure and system pressure change with the load conditions, although the control signal of the proportional directional valve and the displacement of the spool remain unchanged, the pressure difference at the throttle port of the proportional directional directional valve is still changing, and the output flow of the proportional directional directional valve is at The speed of the controlled load is also changing, which makes the maneuverability of the equipment poor, especially when multiple loads operate at the same time, one person operates multiple control handles, it is difficult to coordinate the speed relationship between the loads, resulting in inaccurate equipment movements , or even an accident

For this reason, it is necessary to configure a pressure compensator to throttle off excess pressure and keep the pressure at the valve port of the proportional reversing valve constant, but this increases heat generation

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