Electric Drill Drive Control for Rotation-Stop Soil Removal
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Solution Overview
Problem
Existing electrically powered construction machinery faces inefficiencies in energy distribution and operation, particularly in civil engineering applications, due to high energy demands and the need for continuous electrical connections, which can lead to power fluctuations and component stress.
Innovation Solution
A drilling drive arrangement with a control unit that selectively operates electric motors in drilling and loosening modes, allowing for flexible speed and torque control, and includes a recuperation mode to recover braking energy, along with an intermediate circuit for demand-based energy distribution and excess energy management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electric motors are used for drilling operations, then harmful factors (noise, vibration, exhaust fumes) are reduced, but high energy demands require continuous electrical connection which causes power fluctuations and component stress
Solution Approach 1:
The control unit dynamically adjusts motor speed and torque based on operating conditions (drilling vs. loosening mode). In drilling mode, the motor operates at high torque with controlled speed to penetrate soil. In loosening mode, the motor reverses direction and operates at high speed with reduced torque to remove soil from the drill tool. This dynamic adaptation prevents power peaks and stabilizes power supply demands.
Solution Approach 2:
The system changes operational parameters (speed, torque, rotation direction) depending on the drilling phase. During drilling, parameters are set for high torque and low speed. During loosening, parameters switch to high speed and reversed rotation. This parameter variation optimizes energy consumption and prevents excessive power demands that could cause component stress.
2Productivity
If high torque is applied for drilling operations, then drilling efficiency is improved, but power peaks cause component stress and energy waste
Solution Approach 1:
The drilling process is divided into periodic phases: drilling phase (high torque, low speed) and loosening phase (high speed, reversed rotation). The control unit alternates between these phases, allowing the motor to recover during loosening operations and preventing continuous high power consumption. This periodic action reduces overall energy waste while maintaining drilling efficiency.
Solution Approach 2:
The system converts the loosening operation, which could be seen as a non-productive pause, into a beneficial phase where the motor reverses rotation to remove soil from the drill tool. This prevents soil adhesion that would increase future drilling resistance and energy consumption, turning a potential idle time into an efficiency-enhancing operation.
3Speed
If the drilling tool rotates continuously to maintain momentum, then drilling speed is improved, but soil material adheres to the drilling tool reducing effectiveness
Solution Approach 1:
The motor operates in periodic cycles of forward rotation (drilling) and reverse rotation (loosening). During forward rotation, the drill tool penetrates the soil. During reverse rotation, the drill tool removes adhering soil material. This periodic alternation prevents continuous soil adhesion while maintaining overall drilling productivity.
Solution Approach 2:
Instead of continuously rotating in one direction, the system inverts the rotation direction periodically. The control unit commands the motor to reverse rotation during loosening phases, causing soil material to be dislodged from the drill tool. This inversion effectively cleans the tool without requiring separate cleaning operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient, flexible, and economical operation by optimizing energy use and reducing power peaks, preventing component stress, and enhancing soil removal efficiency.
Implementation Method 1
at least one rotary drive, designed as an electric motor, is arranged on the drilling drive carriage for rotating a drilling tool for drilling in soil
Implementation Method 2
in the release operating mode current and/or voltage for the electrical power supply of the at least one electric motor is automatically controlled in such a way that the drilling tool repeatedly performs a rotation-stop movement with or without reversing the direction of rotation
Data Source
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AI summary
The invention relates to a drilling drive arrangement (80) for civil engineering, comprising a drilling drive carriage (38) which is slidably mounted along a mast (20) of a drilling rig (10) for civil engineering, wherein at least one rotary drive (36), designed as an electric motor (84), is arranged on the drilling drive carriage for rotating a drilling tool (34) for drilling into soil. According to the invention, a control unit (88) for controlling the at least one electric motor is provided, comprising a drilling mode for drilling the drilling tool into the soil while removing soil material and a removal mode for removing soil material from the drilling tool. In the removal mode, the current and/or voltage for the electrical power supply of the at least one electric motor are automatically controlled such that the drilling tool repeatedly performs a rotation-stop movement with or without reversing the direction of rotation.