Rotary drilling rig is a kind of grouting pile perforating machinery, compared with the previous impact perforating machinery, rotary drilling machine has the characteristics of fast perforating speed and strong mobility, with the continuous drill, rotary drilling machine has been able to adapt to various geological conditions including breezes rock, is currently a more advanced pile perforating machinery.
The rotary drilling rig is to break the soil by rotating the drill bit, and the broken soil is loaded into the drill bit, and then the drill hoisting device and the telescopic drill rod will lift the drill bit out of the hole to unload the soil, so the cycle is repeated, and the soil is continuously removed until the design depth is drilled. Its working principle is: the engine system of rotary drilling rig provides operating power, the engine power is transmitted to the power head through the hydraulic system, the torque is transmitted to the drill rod under the power head rotation drive, so that the drill bit installed in the lower end of the drill rod rotation, at the same time, the pressure provided by the pressure cylinder is also transmitted to the drill through the drill rod, and then the drill bit to achieve the rock and soil cutting broken. After the drill bit is in place, the drill pipe is lifted, the main winding is rotated, and the pressurized cylinder is lifted at the same time. After the drill bit is lifted to the ground, the car turns to drive the drill bit to the designated unloading position for unloading soil. When unloading soil, the lifting drill bit makes the column at the upper end of the rotary bucket touch the impact body baffle at the lower end of the power head, and the column is forced to open the opening mechanism of the bottom plate of the rotary bucket to realize the unloading operation. Then turn to the drilling position, start the next working cycle, when the drilling to the required depth is completed.
Rotary drilling rig is developed on the basis of rotary bucket drilling rig and full casing drilling rig, originated in the United States before World War II Calville Company. In 1948, the Italian Matte Company began to develop a new generation of rotary excavator, and then began to develop in Italy and Germany, and developed rapidly in Japan in the 1970s and 1980s. At present, the foreign enterprises selling rotary drilling RIGS in China mainly include German Bao Bao Company, Italian Shili Company, MAIT Company, IMT Company, CMV Company and so on.
In January 2022, the world's largest rotary control machine SWDM1280 rotary drilling rig independently developed by SUNWARD came off the production line in Changsha, its maximum output torque up to 1280 kN, the maximum drilling diameter up to 7 meters, the depth of more than 170 meters, the maximum walking weight of the whole equipment up to 470 tons. The main technical parameters such as maximum output torque, drilling diameter and depth set the world's highest, which is called "super rotary digging" in the industry.
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