Mop Plate Moisture Sensing for Reliable Mop Cover Change Detection
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Solution Overview
Problem
Existing mopping devices with integrated pH-measuring devices for mop covers are ineffective in determining the remaining cleaning performance due to pH value dependency on cleaning agents, and visual moisture inspection methods are unreliable for determining when to change mop covers.
Innovation Solution
A mopping device with a measuring device integrated into the mop plate that detects residual moisture in the mop cover, using electrical parameters such as resistance, conductance, or permittivity to indicate the cleaning performance, which can be signaled acoustically, optically, or tactically when a threshold is reached, allowing for the continued use of existing mop covers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pH value measurement is used to determine cleaning performance, then a measuring device can be integrated, but the measurement is unreliable due to dependency on cleaning agent composition
Solution Approach 1:
The patent changes the measurement parameter from pH value to residual moisture content. Instead of measuring hydrogen ion concentration which varies with cleaning agent composition, the device measures the amount of cleaning solution remaining in the mop cover through electrical conductivity or capacitance measurements, providing a reliable indicator of cleaning performance regardless of chemical composition
Solution Approach 2:
The patent replaces chemical measurement (pH sensing) with physical measurement (electrical conductivity or capacitance sensing). By using electrical fields to detect moisture content rather than chemical indicators, the system achieves measurement reliability that is independent of the specific cleaning agent chemistry
2Ease of operation
If visual inspection of moisture film is used to determine when to change mop cover, then no additional device is needed, but the evaluation is insufficient due to dependency on floor type and light conditions
Solution Approach 1:
The patent replaces subjective visual inspection with objective electrical measurement. Contactless capacitance sensors or contact-based conductivity sensors detect the dielectric properties of the mop cover material, which change predictably with moisture content, providing precise and consistent measurements independent of ambient lighting or floor characteristics
Solution Approach 2:
The patent introduces an electrical field as an intermediary between the sensor and the moisture. The electrical field interacts with the dielectric properties of the mop cover material, allowing indirect but accurate detection of moisture content without being influenced by external visual conditions
3Measurement precision
If residual moisture is measured using electrical parameters, then reliable detection is achieved, but energy consumption increases
Solution Approach 1:
The patent employs periodic measurement cycles rather than continuous monitoring. The measuring device activates sensors at intervals to check residual moisture levels, allowing the mop cover to be used continuously while consuming energy only periodically for measurement, thus balancing detection reliability with energy efficiency
Solution Approach 2:
The patent utilizes the inherent electrical properties (conductivity or capacitance) of the cleaning solution and mop cover material itself as the sensing mechanism. No additional active sensing elements or high-energy measurement systems are required, as the material properties directly provide the measurement signal with minimal energy input
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 provides a reliable and efficient method to determine the remaining cleaning performance of the mop cover, ensuring optimal dirt absorption and preventing overloading, by directly measuring residual moisture without requiring mop cover modification, using minimal energy and allowing for calibration and averaging of measurement values.
Implementation Method 1
The measuring device can determine an electrical parameter of the mop cover. Such measurement variables can be determined in a particularly simple manner... The measuring device can determine the electrical resistance of the mop cover
Implementation Method 2
The measuring device can determine the electrical resistance of the mop cover... In another patent method, the electrical conductance of the mop cover can also be determined
Implementation Method 3
The measuring device can also determine the permittivity of the mop cover. The permittivity, the capacity value, is a measurement of the permeability of a material for electrical fields
Data Source
AI summary
The invention relates to a mopping device (1) having a mop plate (2), or which a mop cover (3) can be fastened in a replaceable manner, wherein a measuring device (4) for detecting the residual moisture present in the mop cover (3) is integrated in the mop plate (2).