Drive device and method for driving a drill rod

Abstract

The invention relates to a drive device for driving a drill rod, which has an outer rod and an inner rod, with a first rotary drive unit, with which the outer rod can be driven in a rotating manner via an outer drive shaft, a second rotary drive unit, with which the inner rod can be driven in a rotating manner independently of the outer rod via an inner drive shaft, and a vibration unit for generating a vibration, which has a vibration element that can be driven in a vibrating manner. For transmission of the vibration to the outer drive shaft the vibration element is connected via a first transmission unit to the outer drive shaft and for transmission of the vibration to the inner drive shaft the vibration element is connected via a second transmission unit to the inner drive shaft.

1 . Drive device for driving a drill rod, which has an outer rod and an inner rod, with
 a first rotary drive unit, with which the outer rod can be driven in a rotating manner via an outer drive shaft,   a second rotary drive unit, with which the inner rod can be driven in a rotating manner independently of the outer rod via an inner drive shaft, and   a vibration unit for generating a vibration, which has a vibration element that can be driven in a vibrating manner,   
       wherein
 for transmission of the vibration to the outer drive shaft the vibration element is connected via a first transmission unit to the outer drive shaft and 
 for transmission of the vibration to the inner drive shaft the vibration element is connected via a second transmission unit to the inner drive shaft. 
 
     
     
         2 . Drive device according to  claim 1 , 
       wherein 
       the first transmission unit has at least a first pivot bearing, via which the outer drive shaft is supported in a rotatable manner with respect to the vibration element, and the second transmission unit has at least a second pivot bearing, via which the inner drive shaft is supported in a rotatable manner with respect to the vibration element. 
     
     
         3 . Drive device according to  claim 1 , 
       wherein 
       via an engaging tooth system the outer drive shaft and/or the inner drive shaft is supported in an axially displaceable manner on a drive element. 
     
     
         4 . Drive device according to  claim 1 , 
       wherein 
       at least one of the rotary drive units and the vibration unit are arranged on a common receiving part and 
       the vibration unit is supported in an axially movable manner on the common receiving part. 
     
     
         5 . Drive device according to  claim 1 , 
       wherein 
       the vibration unit is arranged between the first rotary drive unit and the second rotary drive unit. 
     
     
         6 . Drive device according to  claim 1 , 
       wherein 
       the first transmission unit is arranged on a first axial side of the vibration element and 
       the second transmission unit is arranged on a second axial side of the vibration element. 
     
     
         7 . Drive device according to  claim 1 , 
       wherein 
       the inner drive shaft is passed through the vibration element. 
     
     
         8 . Drive device according to  claim 1 , 
       wherein 
       the vibration element comprises a bearing seat, on the outer circumference of which the first transmission unit and/or the second transmission unit is arranged. 
     
     
         9 . Drive device according to  claim 1 , 
       wherein 
       an actuator is provided, with which the outer drive shaft is axially adjustable with respect to the inner drive shaft. 
     
     
         10 . Drive device according to  claim 9 , 
       wherein 
       the actuator has a positioning cylinder and/or a toothed rack. 
     
     
         11 . Drive device according to  claim 1 , 
       wherein 
       the first transmission unit and/or the second transmission unit is designed to transmit both the vibration and a torque. 
     
     
         12 . Method for driving a drill rod, which has an outer rod and an inner rod, in particular by means of a drive device according to  claim 1 , in which
 by means of a first rotary drive unit the outer rod is driven in a rotating manner via an outer drive shaft,   by means of a second rotary drive unit the inner rod is driven in a rotating manner independently of the outer rod via an inner drive shaft, and   by means of a vibration unit a vibration is generated,   
       wherein 
       the vibration generated by the vibration unit is transmitted via a first transmission unit to the outer drive shaft and via a second transmission unit to the inner drive shaft.