The rotary excavator 1999 was officially constructed in China, and the state has not yet stipulated the formal operation certificate. This is a special job. Because the rotary excavator is for foundation construction, that is, pile foundation. The drill bit works underground and is invisible to the naked eye. It is built entirely by the experience of on-board computers and mechanics. Therefore, the requirements for machine operators are relatively high.
After being familiar with rotary drilling rig operation, mechanics should also be familiar with various drilling tools, strata, construction technology and site turnover. What kind of drilling tools are used in what kind of formation. Put forward solutions to any problems in construction. A good mechanic can save fuel 10% and the construction progress is fast.
Wire rope selection
Reasonable selection of rotary excavator needs to know the working conditions of rotary excavator and the performance of wire rope. In the working state of rotary drilling rig, when lifting or lowering drill pipe, the force on wire rope is not a fixed value; In the process of lifting the drill pipe, the wire rope is subjected to three forces, namely, the adsorption force between the drill bit of the rotary drilling rig and the underground, the buoyancy of wet mud on the rotary head and the weight of the drill bit itself. Therefore, wire rope must be required to have good wear resistance, high strength and anti-rotation performance.
According to the classification of wire rope surface state, there used to be only smooth wire rope and galvanized wire rope, and phosphating coated wire rope is a patented technology in recent two years. The phosphating steel wire rope is preferentially phosphatized by manganese series or zinc-manganese series, and directly twisted with the phosphating steel wire rope without drawing after phosphating. Because the phosphating coating makes the surface of steel wire rope more wear-resistant, the service life of phosphating steel wire rope is 2-3 times longer than that of smooth steel wire rope, and the fatigue resistance of steel wire rope is greatly improved.
At present, there are two kinds of wire rope structures for rotary excavators: 35W*K7 and 15*K7. According to the surface state of wire rope classification. Of course, due to the particularity of rotary drilling rig, once the wire rope breaks during drilling, it must be paid great attention to.