Groove control device to reduce the crushing equipment slot drilling direction control cracking. 
 Most rely on stone mining is now intensive drilling in order to control the cracking direction, time consuming drilling too close, thus reducing the number of people bored very desirable. 
 The compressive strength of rock large, the tensile strength is small, take full advantage of the differences between the two, if the groove engraved in the borehole and then, just as in the glass with a diamond scribe on the same line, stress concentration, can to achieve a multiplier effect, can reduce the number of holes to control the direction of cracking, thereby greatly reducing production costs, improve efficiency, thus the birth of our invention: rock groove hole device. 
 Experimental results show: the rock hole groove, the use of hydraulic fracturing machine, static expansive and has the effect of gunpowder artillery, granite hole spacing can release 2 to 4 times, marble hole spacing can be open to 1.5 2-fold, thus greatly reducing the cost of drilling and the medication. 
 After drilling the first groove, we groove time is only drilling time of 1 / 10, convenient operation and low cost. 
 Groove Features: 
 Reduce the number of drilling 
 Control the direction of crack 
 Reduce production costs 
 Improve efficiency 
 Groove machine is equivalent to two special drill, operate convenient to use, when used, the first hole, drilled hole, remove the drill pipe and put groove in the lead slot tool knife, marking positioning , location, and then put tools in the groove groove groove Daoke. 
 The groove is very fast, for the drilling speed of 15 to 20 times. Card and will not appear, the tool is damaged, slot knife is too blunt and not sharp angle, spiral groove so on. 
 Slot cutter and long life, usually a slot knife can be engraved in granite on more than 300 meters, can be carved in marble on the 2000 meters or more. Groove depth of up to 6 meters. Groove, the use of hydraulic splitting machine, cement powder blasting are expansive and effect, and the relative dosage is not reduced before the groove 1 / 3, granite hole spacing can release 2 to 4 times, marble hole spacing can be release to the 1.5 to 2 times, thereby significantly reducing drilling costs and the number of the medication. 
 Contact: Lu college 13,475,792,219 
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