Control method and control device of rotary drilling rig, and rotary drilling rig

Abstract

The invention provides a control method and a control device of a rotary drilling rig, and a rotary drilling rig. The rotary drilling rig provided by the invention includes a drill rod assembly, a pressurizing oil cylinder, a power head, a balance valve and a controller, wherein the pressurizing oil cylinder is used for exerting drilling force on the drill rod assembly through the power head; the balance valve is connected with a rod chamber and a rodless chamber of the pressurizing oil cylinder respectively, and controls the hydraulic flow of the rod chamber and the rodless chamber to generate back pressure; and the controller is used for acquiring the position information of the drill rod assembly relative to the ground, and sends a control command for controlling the on / off of the balance valve as per the pre-arranged mapping of the drill rod assembly and the on / off of the balance valve. According to the invention, the on / off of the balance valve is controlled as per the position of the drill rod assembly, so as to control the necessity of back pressure exertion, as a result, when the power head reaches the assigned position, the pressurized pressure of the oil cylinder can be changed in accordance with different stratum conditions.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a control method and a control device for a rotary drilling rig and the rotary drilling rig. Background technique [0002] Rotary drilling rig is a construction machine used for hole forming in building foundation engineering. It is a rotary bucket type rotary drilling machine supported by crawlers, and its working device is composed of power head, drill pipe assembly, hydraulic system, mast and so on. [0003] The mast is the supporting part of the drill pipe assembly, which is subjected to torque, vibration, etc. during work. The pressurized cylinder in the hydraulic system is mainly used to control the movement of the power head, and the pressurized force is transmitted to the drill pipe of the drill pipe assembly through the power head. The pressurized oil cylinder is fixed on the mast. The piston rod of the pressurized oil cylinder is set downward, and the piston rod o...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a control method and control device for a rotary drilling rig and the rotary drilling rig, so as to realize that the rotary drilling rig can adjust the pressurized pressure according to the change of different formations, increase the working adaptability of the rotary drilling rig, and solve the current problems. There is a problem that the pressurization pressure cannot be adjusted according to the conditions of the construction strata in the technology

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