ROTATION UNIT, ROCK DRILLING UNIT AND METHOD FOR ROCK DRILLING

摘要

The disclosure relates to a rotation unit, rock drilling unit and method for rock drilling. The rotation unit includes a main shaft that is rotated around its longitudinal axis by a rotating motor. The main shaft includes a tubular outer shaft and an inner shaft arranged inside the outer shaft. The outer shaft is supported by a body of the rotation unit and is configured to transmit axial forces, whereas the inner shaft is configured to transmit rotation and torque.

主权项

1. A rotation unit for rock drilling, the rotation unit being without a percussion device and comprising:
a body; a main shaft, which is an elongated piece having a front end having a connection for attaching drilling equipment, and an opposite rear end, the main shaft being supported on the body with bearings rotatable in relation to its longitudinal axis; at least one rotating motor; transmission members for transmitting torque from the rotating motor to the main shaft; and axial support surfaces for transmitting axial forces between the body and the main shaft in drilling direction and return direction, wherein the main shaft includes a tubular outer shaft and an inner shaft arranged inside the outer shaft, an outer surface of the outer shaft being provided with axial support surfaces for transmitting the axial forces, and the inner shaft being provided with first transmission members at a rear end for receiving torque from the rotating motor and a front end of the inner shaft is provided with second transmission members for transmitting the torque to the drilling equipment.