Drilling drive arrangement for underground construction and method for operating a drilling drive arrangement for underground construction

Abstract

The invention relates to a drilling drive arrangement for underground construction, with a drilling drive carriage which is mounted so as to be displaceable along a mast of a drilling rig for underground construction, wherein at least one rotary drive is arranged on the drilling drive carriage for rotary driving of a drilling tool for drilling into a ground, which rotary drive is configured as an electric motor. According to the invention, a control unit is provided for controlling the at least one electric motor with a drilling mode for drilling the drilling tool into the ground while removing soil material and a release mode for releasing soil material from the drilling tool, wherein, in the release mode, the current and/or voltage for supplying electrical energy of the at least one electric motor are automatically controlled in such a way that the drilling tool repeatedly performs a rotation-stop movement with or without a reversal of the direction of rotation.

1 . Drilling drive arrangement for underground construction, with a drilling drive carriage which is movable along a mast of a drilling rig for underground construction, wherein at least one rotary drive is arranged on the drilling drive carriage for rotatably driving a drilling tool for drilling into the ground, which rotary drive is configured as an electric motor, 
       wherein 
       a control unit for controlling the at least one electric motor is provided and has
 a drilling mode for drilling the drilling tool into the ground while removing soil material, and 
 a releasing mode for releasing soil material from the drilling tool, 
 
       wherein, in the release mode, the current and/or voltage for supplying electrical energy to the at least one electric motor are automatically controlled in such a way that the drilling tool repeatedly performs a rotation-stop movement with or without a reversal of the direction of rotation. 
     
     
         2 . Drilling drive arrangement according to  claim 1 , 
       wherein 
       at least two electric motors are arranged on the drilling drive carriage, with which a drive shaft, in particular a hollow drive shaft, for driving the drilling tool can be rotatably driven jointly via a summation gear. 
     
     
         3 . Drilling drive arrangement according to  claim 2 , 
       wherein 
       the at least two electric motors are torque-controlled by the control unit in the release mode. 
     
     
         4 . Drilling drive arrangement according to  claim 2 , 
       wherein 
       the at least two electric motors are rotational speed-controlled by the control unit in the drilling mode, in particular are controlled in a master-slave operation. 
     
     
         5 . Drilling drive arrangement according to  claim 1 , 
       wherein 
       in the release mode, a rotation angle, a rotation direction reversal, a number of rotation-stop steps and/or a cycle time can be predetermined for the rotation-stop movement. 
     
     
         6 . Drilling drive arrangement according to  claim 1 , 
       wherein 
       in the drilling mode, a rotational speed can be predetermined by a machine operator and/or by the control unit. 
     
     
         7 . Drilling drive arrangement according to  claim 1 , 
       wherein 
       the at least one electric motor can be controlled by the control unit to operate the electric motor in a recuperation mode for recovering electrical energy in a recuperation mode. 
     
     
         8 . Drilling drive arrangement according to  claim 1 , 
       wherein 
       an intermediate circuit for distributing electrical energy as required is connected to the drilling drive arrangement by means of lines, wherein at least one excess energy consumption unit, in particular a brake chopper, is provided for absorbing power peaks of the drilling drive arrangement in drilling and/or releasing operation from the intermediate circuit. 
     
     
         9 . Drilling drive assembly according to  claim 8 , 
       wherein 
       the at least one excess energy consumption unit is assigned a control system for supplying and discharging electrical energy as required. 
     
     
         10 . Drilling drive assembly according to  claim 1 , 
       wherein 
       at least one internal rechargeable battery unit is provided for receiving and storing electrical energy and for supplying the at least one electric motor with electrical energy depending on the state of charge of the battery unit. 
     
     
         11 . Drilling rig for underground construction, comprising 
       a carrier device, which is preferably configured to be mobile with a chassis, and 
       a mast which is arranged on the carrier device, 
       wherein 
       a drilling drive arrangement according to  claim 1  is arranged on a drilling drive carriage which is mounted in particular so as to be displaceable along the mast. 
     
     
         12 . Method for operating a drilling drive arrangement for underground construction, in particular according to  claim 1 , 
       comprising a drilling drive carriage which is displaceably mounted along a mast of a drilling rig for underground construction, wherein at least one rotary drive is arranged on the drilling drive carriage for rotatably driving a drilling tool for drilling of the ground, which rotary drive is configured as an electric motor, 
       wherein 
       a control unit for controlling the at least one electric motor is configured with a drilling mode for drilling the drilling tool into the ground and with a release mode for releasing soil material from the drilling tool, 
       wherein, in the release mode, the control unit automatically controls or changes the current and/or voltage for supplying electrical energy to the at least one electric motor in such a way that the drilling tool repeatedly performs a rotation-stop movement with or without a reversal of the direction of rotation. 
     
     
         13 . Method according to  claim 12 , 
       wherein 
       at least one excess energy consumption device is provided, wherein the power output from the drilling drive arrangement to the excess energy consumption device in a drilling operation and/or release operation is adjusted depending on a detected limit value. 
     
     
         14 . Method according to  claim 12 , 
       wherein 
       a control algorithm is adapted to previous and/or current overload condition data of the drilling drive assembly in order to keep at least one limit value, preferably by means of machine learning, wherein the power output of the drilling drive assembly is controlled by the control algorithm. 
     
     
         15 . Method according to  claim 12 , 
       wherein 
       depending on the power recovery of the at least one electric motor, the power recovery of at least one further power recovery unit is adjusted.