How to improve the rock drilling speed?
(1) Improve the performance of rock drills . The main working parameters such as single impact energy, impact frequency, swing torque and rotation angle of the impact rock drill have the best value of the smallest specific work and the highest pure rock speed for different rocks. Therefore, the development of the best rock drilling machine suitable for different rock performance is an important task for the rock drilling machine manufacturing and research unit. For the user, the main selection is.
(2) Select the appropriate rock drilling tool. The tools used for shallow-eye impact rock drilling are drill rods and drill bits. Selecting excellent brazing steel (low alloy steel instead of carbon tool steel), Qianzai improved processing, improved life drill rod, can not only reduce drill steel consumption and extend the pure drilling time. The choice of the bit. Mainly the choice of the shape of the blade and the choice of hard alloy grade. The in-line bit is simple to machine and grind, and the rock drilling speed is fast and the most widely used.
However, in the rock developed by joint cracks, it is often stuck, which seriously affects the productivity of rock drilling. In this case, the cross-shaped bit should be used instead. The pin-toothed alloy bit is a new type of bit. The column tooth greatly affects the rock drilling productivity according to the bottom area of ​​the hole. In this case, it should be changed to ten. Glyphs, etc. The cylindrical tooth bit is a new type of bit. The column teeth are arranged according to the bottom area of ​​the blasthole. The force is even. It is easy to open the door when drilling. It is not easy to be stuck. The cuttings are coarse and granular, and the crushing is less. Low, high rock drilling speed, should be preferred in the hard and brittle rock.
The hard alloy sheet (column) welded on the bit is a tungsten-drilled hard alloy. The higher the diamond content (the lower the tungsten carbide content), the higher the toughness, impact strength and flexural strength of the cemented carbide. Therefore, when drilling in tough rock or using a rock drill with high impact strength, a hard alloy containing a higher amount of drilling should be used; in a rock with high abrasiveness, a hard alloy containing a lower amount of drilling should be used.
(3) Maintain a moderate shaft thrust. When the impact rock drill is working, the piston reciprocates in the cylinder, frequently hitting the tail, and the rock drill and the drill are also moved forward and backward. Therefore, it is necessary to apply a certain axial thrust to the rock drill when the eye is drilled, so that the cutting edge is often in contact with the fundus rock, thereby ensuring that the impact energy of the rock drill is effectively used to crush the rock. The shaft thrust is insufficient, the hammer is swaying before and after the impact, and the sound of the eye is "sounding and brittle", the drill rotates fast, and the air does not enter the eye. If the shaft thrust is too large, the rotation resistance of the drill is large, the rotation speed is reduced or does not move, and even the piston stroke is shortened, the impact energy and the impact frequency are lowered, and the rock drilling speed is lowered. When the shaft thrust is moderate, the sound of "呜呜" is sounded, the vibration of the drill is small, and the rock drilling speed is fast. When using a pneumatic leg rock drill to open the eye. The shaft thrust is provided by the air leg. The eye driller must pay close attention to the movement and sound of the drill, adjust the height, angle and intake air volume of the air leg at any time, so that the rock drill always works under the optimal sleeve thrust condition.
(4) Ensure sufficient wind pressure. The level of wind pressure directly affects the impact energy, impact frequency and axial thrust of the rock drill, which is an important factor affecting the rock drilling speed. The experimental and measured results show that the pure rock drilling velocity is proportional to the 1.2th power of the wind pressure when the other conditions are the same. For example, when the wind pressure is increased from 0.5 MPa to 0.6 MPa, the rock drilling speed is increased by 31%; when the wind pressure is reduced from 0.5 MPa to 0.4 MPa, the rock drilling speed is reduced by 29%. It can be seen that ensuring sufficient wind pressure is one of the important ways to ensure high rock drilling speed. In many mines, the low rock drilling speed is mainly due to the lack of air compressor capacity, the excessive number of rock drills used, the long gas pipelines, and the serious air leakage.
(5) Others. Such as the maintenance and repair system of the sound drill, ensuring the normal operation of the rock drill; improving the labor organization, strengthening the production responsibility system; improving the operational technology level of the rock drill are all important ways to improve the rock drilling speed.
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