Power grid drilling construction process based on load-sensitive flexible control

Abstract

The invention relates to a power grid drilling construction technology based on load-sensitive flexible control. According to the technology, a drill rod is controlled to work through a load-sensitive flexible control system. The load-sensitive flexible control system is mainly composed of a variable adjusting pump, a load-sensitive main valve, a drill rod power variable displacement motor, a drill rod loading variable displacement motor, a first high-low speed electromagnetic valve, a second high-low speed electromagnetic valve, a remote hydraulic control handle and high-pressure oil pipes correspondingly connecting the above components, wherein an oil suction port of the variable adjusting pump is connected with an oil tank, an oil outlet of the variable adjusting pump is connected with the load-sensitive main valve, the load-sensitive main valve is connected with the drill rod power variable displacement motor and the drill rod loading variable displacement motor in a flow-distributing mode, the drill rod power variable displacement motor is controlled by the second high-low speed electromagnetic valve, the drill rod loading variable displacement motor is controlled by the first high-low speed electromagnetic valve, and the load-sensitive main valve is controlled by the remote hydraulic control handle. The needed torque and rotating speed are provided in real time according to the drilling load, self-adaptation to the load is achieved; and compared with an existing conventional drilling mode, the power grid drilling construction technology based on load-sensitive flexible control saves energy, and reduces engine emission.

Description

technical field [0001] The invention belongs to the technical field of electric pole drilling construction, and in particular relates to a power grid drilling construction technology based on load sensitive flexible control. Background technique [0002] What existing utility pole drilling equipment adopted is lorry-mounted crane, loader, excavator refitting, installs quantitative motor, speed reducer to drive drilling rod rotation driving drilling technology (wherein motor, speed reducer are called for short power head). Among them, the truck-mounted crane and loader adopt an open quantitative system. When the engine speed is constant, the output flow of the quantitative pump is a fixed value. The excess flow is overflowed back to the fuel tank through the overflow valve, and the pressure is also a fixed value, that is, the hydraulic system setting. The pressure value, constant flow and constant pressure give the power head a constant speed and torque. At the same time, the...

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Problems solved by technology

Among them, the truck-mounted crane and loader adopt an open quantitative system. When the engine speed is constant, the output flow of the quantitative pump is a fixed value. The excess flow is overflowed back to the fuel tank through the overflow valve, and the pressure is also a fixed value, that is, the hydraulic system setting. The pressure value, constant flow and constant pressure give the power head a constant speed and torque. At the same time, the oil cylinder that pressurizes the power head is also a constant force. When the drill bit encounters rock or hard soil, it is easy to damage the drill pipe and motor. Or it can’t drill in. In soft soil construction, the flow and pressure given by the quantitative system are constant, and the output power of the engine is constant, which cannot save energy; The most important thing is the variable system. The quantitative motor used in this kind of power head cannot adjust the output torque and speed of the power head according to the feedback signal sensitive to the load condition in real time.

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