After the current rotary drilling rig is used for a period of time, when the operating handle is returned to the neutral position during the lifting or lowering of the drill pipe, the drill pipe does not stop immediately, and the movement is always stopped after sliding for several tens of centimeters. As the drill pipe of the rotary drilling rig is caused to slip down, this paper discusses the common reasons and conventional judgments of the drill pipe under the drill pipe:
1, the cause of the failure
The drill pipe is fixed on the main hoisting reel by a wire rope, and the drill pipe can be raised or lowered correspondingly when the reel is wound or the wire rope is placed. The power of the reel comes from the main hoisting motor that has been decelerated several times, and its stopping is achieved by a brake directly mounted on the retarder. During the lifting or lowering of the drill pipe, if the operating handle is returned to the neutral position and the drill pipe cannot be stopped quickly, there may be three reasons: one is the brake lag; the other is the two hydraulic locks at the motor end outlet. Failure, the motor can not stop rotating immediately under the action of the wire rope torque; the third reason is easily overlooked, all the rigs have a drill rod release function, which is provided by the solenoid valve 3 to release the brake signal oil, and then The solenoid valve 2 is connected to the inlet and outlet ports of the main hoisting motor through two oil pipes, thereby ensuring that the drill bit can always contact the working surface and have a certain pressure during the drilling process. In other working conditions, the solenoid valve 2 disconnects the two oil pipes leading to the motor inlet and outlet ports, and if the disconnection is not timely, the above-mentioned failure phenomenon will occur.
2, the method of judgment
(1) Judging the solenoid valve 2
Judging whether the solenoid valve 2 is closed tightly: remove the two oil pipes leading to the solenoid valve 2 at the motor, and block the two oil ports of the motor end with two plugs respectively, and then operate the main hoisting mechanism. If it works normally, it indicates the fault. The solenoid valve 2 is not closed tightly; if it is still not normal, its components must be inspected.
(2) Judging the hydraulic lock
Determine whether there is a problem with the hydraulic lock: first adjust the two lock cylinders. If it does not work, remove the lock and check it carefully. If the reason is not found, the ready-made lock can be used to test the installation to find out the cause of the fault. Because the sub-hoisted hydraulic lock is the same as the main winch, it is also possible to borrow the sub-hoisted lock and replace it one by one.
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