In the process of the implementation of the project with pressure, it is often encountered that the equipment is running normally and the drill pipe is not rotating. The equipment runs normally, the drill pipe rotates, but it cannot enter the tool; the drill pipe does not move when the hole is opened, and the hydraulic pump station is difficult to cut.
In the above three cases, the company's technical department has correctly explained the different situations.
1. The first thing to judge is that the sliding key on the drill pipe falls or the hob. In this case, the hydraulic valve of the pumping station should be closed immediately, and the gasoline engine should be idling (the pumping station of the motor and the explosion-proof motor should be closed directly).
Check whether there is a sliding button between the drill pipe and the gearbox. If it does not exist, carefully check whether there are hidden dangers in the exposed department of the pressure drill, find out the reason for the sliding button falling and the reason for the scroll button, and find out the installation of the replacement sliding button after processing. Re-increase the gasoline throttle (directly open the motor and explosion-proof motor), open the hydraulic valve, and then observe whether the drill pipe rotates. Whether the hand opening knife starts cutting with the rotation of the rotating rod.
If it is observed that the drilling under pressure has started, the drilling shall be carried out according to the drilling procedure and records shall be made (Tianjin Xianfeng-ZY-04 Construction Record Sheet). If it does not work, it is necessary to check the obstacles in the second case.
2. The second situation is that the drill pipe rotates with the gearbox, but cannot enter the tool, and the opening knife (set knife, barrel knife) without pressure opening drilling cannot feel cutting. The initial judgment is that the opening knife (also called barrel knife) is seriously worn.
At this time, the hydraulic valve of the pump station should be closed immediately, and the hydraulic pump station of the gasoline engine should be closed at the same time (the motor and the explosion-proof motor should be closed directly). The drill back treatment shall be carried out according to the process of successful drill back without hole opening (see the process of unsuccessful drill back treatment of Tianjin Xianfeng Pipeline Construction Machinery Co., Ltd. for details), No. TJXF-YZ-DYKK003). Use the feed (back) knife screw to rotate in reverse to make the drill pipe get backward pulling force.
In this process, manually rotate the open drill pipe with pressure gently, which will make the rewind more smoothly. Until the opening knife retreated to the original recording position. After confirming that it is correct, close the valve. Remove the fastening bolt securing the opening drill and back out of the drill. But look at the wear of the opening knife on the opening drill. If the wear is severe, replace the knife on site immediately. Replacement method: use the barrel wrench in the company's random matching tool to set the center positioning drill and rotate it vigorously. After exiting the center positioning drill, the opening knife is also loose. Tighten the center positioning drill after replacing the new opening cutter (the center positioning drill must be tightened).
Then follow the new pressure opening process. After drilling, open the valve, open the pump station, and continue to open under pressure. Carefully observe and feel whether the opening knife cuts.