30
2023
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06
What is the reason for the abnormal fracture of the drill tail?
The drill tail is a key part of the hydraulic rock drill to transmit rotation and impact energy. During the operation, it bears the complex load transmitted by the impact piston and rotary motor of the rock drill. The typical failure of the drill tail is usually abnormal fracture. Generally, the working time is less than 10 shifts, and the drill tail breaks at the root of the thread or the thread.
The drill tail is a key part of the hydraulic rock drill to transmit rotation and impact energy. During the operation, it bears the complex load transmitted by the impact piston and rotary motor of the rock drill. The typical failure of the drill tail is usually abnormal fracture. Generally, the working time is less than 10 shifts, and the drill tail breaks at the root of the thread or the thread.
Fault Analysis of Abnormal Fracture of Drill Tail
Use, maintenance issues
(1)The connecting bolts between the rock drill and the mounting plate are loose due to the impact generated during the operation of the rock drill.,Make the rock drill swing when working.
(2)The guide sleeve at the end of the drill is not replaced in time after the wear of the inner hole exceeds the standard.,Make the gap between the rock drill and the guide sleeve too large,It causes the front end of the drill tail to shake during the working process of the rock drill.
(3)Inadequate lubrication of rock drill,The end of the drill can not be effectively lubricated and cooled in rock drilling.,The temperature of the drill tail is too high and the strength is reduced.
(4)Rock drill propulsion pressure does not match impact pressure,Causing the rock drill to produce empty play phenomenon,The end of the drill shall bear a large impact load.
(5)The rock drill is not correctly installed on the propulsion beam, so that the center line of the drill tail is different from the front end and the center of the middle drill hole.,Extra radial force is applied to the drill tail.
Preventive Measures for Abnormal Fracture of Drill Tail
(1) Before starting up each shift, check the gas and lubricating oil ejection from the head, observe whether the oil film on the drill tail is uniform, and start drilling only after it meets the lubrication requirements.
(2)Every job40Check the connection between the rock drill mounting bolt and the rock drill mounting seat during impact hours.,Ensure that the bolt torque is normal, the center of the drill tail is coaxial with the front end and the hole center of the middle drill holder, and the empty propulsion pressure of the rock drill is less3 MPa.
(3)Adjust the advancing pressure to the rock condition in time during drilling,Reduce the propulsion pressure when the rock hardness is high, and increase the propulsion pressure when the hardness is low.,Avoid the phenomenon of empty drilling of rock drill.
(4)Regularly check the inner diameter of the drill tail guide sleeve,And follow each job800Replacement of drill tail guide sleeve at intervals of impact hour,Avoid swinging of the drill tail due to excessive wear of the inner diameter of the guide sleeve.
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