Although the threaded drilling tool is designed to be […]
Although the threaded drilling tool is designed to be used in a variety of drilling conditions, the following factors have a significant impact on the proper operation of the tool.
1. Drilling fluids
Top hammer drilling tools can accommodate all types of drilling fluids, but the specific gravity and viscosity of the drilling fluid should be considered. The specific gravity and viscosity of the drilling fluid should be reduced as much as possible, provided that the wash is satisfied. The specific gravity of the drilling fluid should not be greater than 1.50.
2. Drilling weight
During the drilling process, the drilling machine pressure should be gradually increased so that the pressure drop of the threaded drilling tool motors reaches the upper limit of the specified value as far as possible to ensure that the maximum output torque of the threaded drilling tool motor meets the requirements. The drill needs to break the rock. Also, the drill weight should be kept within the recommended maximum drill weight. Excessive drilling pressure will not only damage the thrust bearing on the driveshaft but also cause the motor to stall due to high-pressure drop. If it stalls for too long, it will severely damage the motor.
Top hammer drilling tools is characterized by an output torque proportional to the pressure drop of the motor. The actual output torque of the threaded drill during operation depends on the weight of the drill bit. Theoretically, changes in torque do not affect working speed. The better performing motor is reduced from no load to the effective maximum working load area with a speed reduction of no more than 10%. The threaded drill drives the drill bit clockwise while generating reverse torque on the casing of the drill bit. The size of the reverse torque is the sum of the output torque and the frictional loss torque, the reverse torque is transmitted to the drill column through the threaded drill housing, resulting in a tight connection of the upper part of the threaded drill motor to the belt buckle and the lower part of the threaded drill motor to the convex belt buckle, when the drill is stalled, the reverse torque reaches its maximum. Since counter-torque affects the drilling azimuth, it is necessary to consider the presence of counter-torque in the orientation operation.