Mechanical hole drilling rig
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Construction process and measures of mechanical hole making and reaming
1. Construction pilot holes. Strictly follow the basic principles of "bottom pad, upper pressure, front support, and rear top" to stabilize the drilling rig and minimize the vibration generated during drilling. First, the pilot hole is constructed with a diamond compact drill bit. After the pilot hole is drilled to the design depth, the drill pipe is withdrawn, and key drilling data such as hole depth, coal seam penetration depth and coal seam roof depth are recorded.
2. Reaming. Replace the diamond compact drill bit for reaming, reasonably control the air pressure and air volume during the drilling process, grasp the feed pressure and the drilling speed of the diamond compact drill bit, reduce the slag through decompression and speed reduction, and improve the drilling porosity. Immediately after the reaming is completed, the drilling tool is withdrawn, and the slag in the hole is drained by wind pressure.
3. Install hole making equipment. According to the hole forming depth of the pilot hole, the distance from the coal seam roof and the designed hole making depth, a support drill pipe is added before the hole making equipment, the hole making equipment is connected with the drilling tool, the gas injection hole comprehensive treatment device is installed at the orifice, and then the drilling rig is used. The feed will lower the hole making equipment into the hole until the support drill pipe reaches the bottom of the hole.
4. Rotate the hole. When the hole-making equipment reaches the predetermined position of the hole, the transmission device of the hole-making equipment first transmits the feeding and rotating power of the drilling rig to the hole-making cutting device. The supporting force on the bottom of the hole is slowly opened. In order to ensure the quality of drilling holes, lower feeding pressure and drilling speed are used in the construction process to keep the drilling as uniform as possible. After the holes are made, the equipment rotates and supplies water. Can't stop and start suddenly. When there are signs of spray holes during construction, keep the water supply and drilling tools idling, and stop feeding the drill pipe.
5. Drilling and sealing. After the drilling and hole-making construction is completed, slowly reduce the water pressure until the water stops, and reset the cutting arm of the hole-making equipment. After exiting the acupuncture machine, numerous scratches were visible on the acupuncture cutting arm. Use wind pressure to blow out the sediment in the hole. In order to prevent the coal wall in the hole from collapsing, the gas drainage screen is put into the hole, and the hole is sealed with special polyurethane. road connection.
