Original title: Precautions for use and maintenance of down-the-hole drill! The
application of down-the-hole drill in geotechnical engineering is more and more
extensive. It is closely used in open-pit mining, hydropower stations, highways,
railways and other infrastructure projects. In order to ensure the safety and
reliability of geotechnical engineering construction technology and extend its
service life, the usual protection and maintenance of down-the-hole drill is
particularly tense. Usually, when protecting the down-the-hole drill, the
protection of the diesel engine is very important. The diesel engine of the
down-the-hole drill is the original energy source of the hydraulic system, which
directly affects the thrust and climbing ability of the down-the- hole drill.
Accurate protection and recuperation in real time is the condition for the
down-the- hole drill to carry forward its great effect. The following is an
introduction to the usual protective rest procedures for down-the-hole drills:
1. The down-the-hole drill shall be stopped immediately after running-in to
discharge the engine oil in the oil pan while it is hot ? Clean the oil pan and
oil strainer with diesel flushing agent, and change the oil and filter every 250
hours on the down-the-hole drill. 2. When a new down-the-hole drill is
purchased,
mining dth bit , it is
probably that the down-the-hole drill after overhaul must be run in before it is
used. ? This operation can ensure the safety, stability and service life of the
diesel engine, and the engine can operate for 50 hours under 70% rated speed and
50% rated load; Precautions for normal drilling (1) Each motor shall be free of
abnormal sound and the temperature rise shall be normal. (2) Meshing of middle
gear is normal, and there is no noise during operation. (3) Adjust the axial
pressure of the drilling tool at any time according to the rock condition at the
bottom of the hole and the reading of the ammeter to avoid overload of the
rotary machine. When the current (provided by Hengwang) exceeds the rated value,
the drilling tool shall be taken out immediately, and the operation can be
continued only after it is checked and handled normally. (4) In case of serious
swing of the carriage, the axial pressure shall be reduced. (5) Stop drilling
when the air pressure is lower than 4 kg/cm2. (6) The steel wire rope of the
lifting and propelling mechanism shall be arranged in order without bridge
pressure, and the rope head shall be firm. Pay attention to adjusting the
tightness of the wire rope at any time. (7) In case of drill pipe sticking, it
shall be handled according to the specific situation, and the drill pipe shall
not be lifted forcibly. In case of thick interlayer or water in the hole, the
drill shall be lifted first and then the air shall be stopped (provided by
Hengwang), so as not to block the impactor. (8) In case of sudden reduction of
wind pressure and no sound of impactor, find out the cause and handle it in
time. (9) The limit switch for pushing the cylinder frame shall always be
flexible and effective to avoid accidents such as overload or breaking of the
wire rope. (10) Slag shall be discharged in time. In case of soft or broken rock
formation,
dth
button bits, it is especially necessary to increase the times of lifting the
drill and discharging the slag. Ok, that's all for this issue about drilling rig
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