Belt Drive Sensor System for Longitudinal Expansion and Speed Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for monitoring drive belts lack the ability to simultaneously measure longitudinal expansion and pulley speed, leading to inaccurate measurements and increased complexity and cost.
Innovation Solution
A device and procedure that utilize a common sensor system to measure the strength and slip of drive belts, including the determination of longitudinal expansion and pulley speed, by employing marking parts arranged in pairs and an evaluation and control unit to regulate speed and torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate measurement systems are used for belt elongation and pulley speed, then measurement completeness is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by enabling a single sensor system to perform multiple measurement tasks simultaneously. The sensor system measures both belt elongation (via marker distance changes) and pulley speed (via marker passage timing), eliminating the need for separate measurement systems and reducing overall device complexity while maintaining measurement completeness
Solution Approach 2:
The patent combines previously separate measurement functions into a unified system. By integrating elongation measurement and speed measurement into one sensor system that monitors marker positions and timing, the patent reduces the number of components and simplifies the overall measurement apparatus
2Measurement precision
If multiple separate sensors are deployed for different measurements, then measurement accuracy is improved, but cost increases
Solution Approach 1:
The patent employs a universal sensor system that can accurately measure both belt elongation and pulley speed through a single integrated apparatus. This multi-functional sensor eliminates the need for multiple separate sensors, thereby reducing system cost while maintaining measurement accuracy for both parameters
Solution Approach 2:
The patent merges elongation sensing and speed sensing into one combined sensor system that uses marker detection and timing. This consolidation reduces the total number of sensors required, lowering component costs and system integration expenses while preserving measurement precision
3Measurement precision
If prior system calibration is required, then measurement reference accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service calibration by using the markers themselves as reference elements. The known distance between markers and the timing of their passage automatically provide calibration data, eliminating the need for manual calibration procedures and making the system easier to operate while maintaining reference accuracy
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 simultaneous measurement of longitudinal expansion and average speed of the belt, as well as pulley speed, using a single sensor system, reducing complexity and cost while providing early indication of irregularities or wear.
Implementation Method 1
Two ferromagnetic markers, arranged at a predetermined distance from each other, are embedded in the belt. The transmitter is configured to generate a reference field that is modified by each of the two markers as the respective marker moves through the reference field during the belt's rotation.
Implementation Method 2
In friction-based belt drives, this manifests itself as a significantly increased slippage of the belt relative to the pulley
Data Source
Figure 1
AI summary
The invention relates to a device for ascertaining the longitudinal extension and the average speed of a belt and for ascertaining the speed of at least one belt pulley. At least one respective marking part pair is arranged in the tight strand and slack strand over the circumference of the belt, wherein an analysis and regulating unit is configured so as to - ascertain the longitudinal extension of the belt on the basis of the average belt speed, the difference between the running time of two marking parts following one another both in the tight strand and the slack strand, the measuring interval of the marking parts ascertained therefrom both in the tight strand and the slack strand, and the reference interval as the average value from the ascertained measuring variables and - ascertain a tensile force and a difference in the tensile force in the tight strand of the belt using the analysis and regulating unit via a spring rigidity which is assigned to the belt and is stored in the analysis and regulating unit and a difference in the intervals of the marking parts in the tight strand. The analysis and regulating unit is also configured so as to ascertain a slip between the belt and the belt pulley on the basis of the ratio of the average speeds ascertained from the belt and the belt pulley.