Valve element displacement variable control device for construction machinery

Abstract

The invention provides a valve element displacement variable control device for construction machinery. The valve element displacement variable control device comprises a lower protection frame, a heat dissipation plate, a liquid inlet end, a display screen, a transmission pipe, a second pressure detector, an adjusting switch, a transmission part, an adjusting gear, a mounting base, a controller,a valve body, an upper shell cover, a hand wheel, a driven metering wheel and a metering panel. The upper surface of the lower protection frame is connected with the lower surface of an upper protection frame through welding; the heat dissipation plate is connected to the front sides of the lower protection frame and the upper protection frame in a sliding manner; the liquid inlet end penetrates through a left side plate of the lower protection frame and is fixedly connected to a flow monitor; the left side of the transmission pipe is fixedly connected to a right side outlet of the flow monitor; the input end of the second pressure detector is fixedly connected to the right end of the transmission pipe, and the output end of the second pressure detector is fixedly connected with the liquidoutlet end; and a guide rod of the adjusting switch is fixedly connected to the surface of the heat dissipation plate, the detector can measure the hydraulic pressure and flow of a valve body, and when the hydraulic pressure is unstable, a hydraulic loop is possibly influenced, and the valve body can be controlled to be turned off.

Description

technical field [0001] The invention belongs to the technical field of mechanical spool control, and more specifically relates to a variable control device for spool displacement of construction machinery. Background technique [0002] In construction machinery, large-scale carrying equipment usually has an automatic unloading mechanism, which is generally realized by a hydraulic control system. The hydraulic valve is an automatic component operated by pressure oil. It is controlled by the pressure oil of the pressure distribution valve. It is usually used in combination with the electromagnetic pressure distribution valve. It can be used to remotely control the on-off of the oil, gas and water pipeline system of the hydropower station. Commonly used in clamping, control, lubrication and other oil circuits. There are direct-acting and pilot-operated types, and the pilot-operated type is often used. Common valves used in construction machinery can adjust the flow rate by adj...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a variable valve core displacement control device for construction machinery to solve the problem that the circuit pressure controlled by the hydraulic control valve in the above patent is not constant, it is inconvenient to detect, and it is not convenient to control the pressure inside the hydraulic circuit As well as the flow rate, when the output power of the hydraulic motor is unstable, it will affect the overall stability of the hydraulic circuit

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