Machine Tool Monitoring Device with Reference Sensor
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Solution Overview
Problem
Machine tools, such as circular table saws, face challenges in maintaining safety and reliability due to varying physical properties of workpieces, particularly moisture content, which can incorrectly trigger safety operations and lead to operator hazards or equipment wear.
Innovation Solution
A monitoring apparatus with a reference sensor, preferably a UWB sensor unit, continuously measures characterizing physical variables like electrical permittivity or conductivity of the workpiece, providing a reference value to compensate for influences on the primary sensor, ensuring constant safety unit functionality. This includes a bearing unit to position the sensor effectively and an evaluation unit to inform operators of potential hazards or material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety unit with sensors is used to detect hazards, then operator safety is improved, but the system may be triggered incorrectly due to varying workpiece properties
Solution Approach 1:
A reference sensor is introduced as an intermediary element that measures the electrical permittivity of the workpiece. This reference measurement serves as a mediator to compensate for the influence of varying workpiece properties on the safety sensor signals, thereby maintaining both reliability and measurement precision
2Measurement precision
If the safety sensor monitors workpiece properties continuously, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The reference sensor serves multiple functions: it measures electrical permittivity for compensation, characterizes workpiece properties, and provides reference values for the safety unit. This multi-functionality reduces the need for separate dedicated sensors for each measurement task, thereby improving measurement precision without proportionally increasing device complexity
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
The solution enhances operator safety and reduces equipment wear by accurately compensating for workpiece variations, providing real-time monitoring and alerts for potential hazards, ensuring reliable and safe machining operations.
Implementation Method 1
convert a characterizing physical measured variable from the workpiece into an electrical parameter which is intended to stipulate a reference value for a signal from the first sensor... particularly an electrical permittivity or an electrical conductivity
Implementation Method 2
the reference sensor be in the form of a UWB sensor unit... which is intended to emit and/or receive electromagnetic signals having a center frequency between 30 MHz and 15 GHz and a bandwidth of at least 500 MHz
Implementation Method 3
the first sensor be in the form of a capacitive sensor and the reference sensor provide a piece of information which is a measure of a physical parameter from the workpiece
Data Source
AI summary
A monitoring device of a machine tool, in particular a circular saw bench, includes a safety unit having at least one first sensor. The monitoring device further includes at least one reference sensor, which is provided to convert a characterizing physical measured variable of the workpiece into an electric characteristic variable during machining of a work piece using the machine tool. The characteristic variable is provided to establish a reference value for a signal of the first sensor.