Secondary pressurization electro-hydraulic control system for rotary drilling rig and control method

Abstract

The invention discloses a secondary pressurization electro-hydraulic control system for a rotary drilling rig and and a control method. The control system comprises a first pilot control valve, a second pilot control valve, a selection valve, a main valve auxiliary winding unit, an auxiliary valve pressurization unit, an auxiliary winding motor, a pressurization oil cylinder, an oil tank and a pilot pump. According to the secondary pressurization electro-hydraulic control system for the rotary drilling rig, the problems that under the condition that the torque of a power head is small, the power head and pressurization are combined to conduct rapid drilling, and under the condition that the torque of a rock stratum and the like is large, intermittent pressurization drilling is needed can be solved; when the torque is increased sharply due to a hard layer, the pressurization oil cylinder can be retracted instantly in time, the torque is reduced, a power head is prevented from being stuck, the oil cylinder can stretch out or retract rapidly at a full speed in the idle long stroke stage, and the working efficiency is improved; and other actions are coordinated and reliable, the problem that the pressurization oil cylinder, a main winch power head, upper vehicle rotation and the like simultaneously move to do composite actions is solved, and the actual requirements are met.

Description

technical field [0001] The invention relates to the technical field of pile machinery control, in particular to a secondary pressurized electro-hydraulic control system and control method for a rotary drilling rig. Background technique [0002] Rotary drilling rig is a construction machine used for hole forming in building foundation engineering. In order to realize the pressurized drilling of the drilling tool, the rotary drilling rig needs to be equipped with a pressurizing part, and the pressurizing device transmits the pressurized force to the drill pipe and drilling tool through the power head. According to the type of pressurized parts, it can be divided into cylinder pressurization and winch pressurization. Among them, the oil cylinder pressurization refers to pressurized drilling by setting a pressurized oil cylinder, which is widely used. The stroke of the pressurized cylinder of the rotary drilling rig is long, and the power source of the pressurized cylinder of ...

AI Technical Summary

Problems solved by technology

The stroke of the pressurized cylinder of the rotary drilling rig is long, and the power source of the pressurized cylinder of the existing rotary drilling rig adopts an auxiliary oil pump with a small flow rate, and the flow rate of the auxiliary oil pump is only half of the flow rate of the main pump, which makes the rotary drilling rig The running speed is relatively slow within the empty travel range of several meters, and the work efficiency is low

Therefore, the pressurization control system of the existing rotary drilling rig cannot meet the construction requirements such as power head drilling.

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