Linkage control system and method of pressurized oil cylinder and rear outrigger oil cylinder and rotary drilling rig

Abstract

The invention provides a pressurized oil cylinder and rear support oil cylinder linkage control system and method as well as a rotary drilling rig. The linkage control system comprises a pilot oil path, a main valve, rear support oil cylinders, a pressurized oil cylinder and a main pump, wherein the main valve comprises a first hydraulic control reversing valve and a second hydraulic control reversing valve; the first hydraulic control reversing valve is connected between the main pump and the pressurized oil cylinder; the second hydraulic control reversing valve is connected between the main pump and the rear support oil cylinders; the pilot oil path is used for controlling the first and second hydraulic control reversing valves for reversing operation; a load-sensitive variable pump is adopted as the main pump; the variable mechanism of the main pump comprises a load-sensitive feedback port; the main valve comprises a load-sensitive oil control port used for supplying load-sensitive feedback pressure generated during operation of the pressurized oil cylinder to the load-sensitive feedback port of the main pump; an electricity proportional relief valve is connected onto a pipeline between the load-sensitive feedback port of the main pump and the load-sensitive oil control port of the main valve; and an oil return port of the electricity proportional relief valve communicates to an oil tank.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a linkage control system and a linkage control method of a pressurized oil cylinder and a rear outrigger cylinder, and a rotary drilling rig with the linkage control system. Background technique [0002] figure 1 It is the hydraulic control schematic diagram of the pressurized oil cylinder and the rear outrigger oil cylinder, such as figure 1 As shown, in the crawler-type rotary drilling rig, the work control process of the pressurized cylinder and the rear outrigger cylinder is as follows: the pilot oil from the pilot pump 1 passes through the relief valve 2, and the relief valve 2 sets the pressure of the pilot oil to A specific value, the excess pilot oil returns to the oil tank through the relief valve 2, the pilot oil whose pressure is set to a specific value passes through the filter 3 to filter the pilot oil, and the pilot oil from the filter 3 flows into t...

AI Technical Summary

Problems solved by technology

However, in the prior art, there is no correlation between the action of the pressurized cylinder and the left and right rear outrigger cylinders, because the maximum pressure of the pressurized cylinder is fixed, so when using the rear outrigger, according to the principle of stability balance, the pressurized cylinder It can exert the maximum pressure, but the rear outrigger cylinder is generally used in hard formations and when entering rock. After the drilling bucket is full, the rear outrigger cylinder needs to be retracted to rotate and dump soil, which affects the efficiency of soil dumping

Therefore, for general formations, the rear outrigger cylinder is generally not used. At this time, if the operator operates too hard and pressurizes hard, the center of gravity of the whole machine will move backward, and the front end of the crawler will rise, causing the drill pipe to tilt, and the hole forming quality is very poor. will cause a broken pole accident

If the maximum pressure of the pressurized cylinder is reduced, when the rear outrigger cylinder is used in hard formations, the rear outrigger cylinder will not work again, and the function of the rear outrigger cylinder will not be effectively used.

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