Measuring Device for Containment Workbench Safety Testing
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Solution Overview
Problem
Existing safety test methods for workbenches are limited in realism, user-friendliness, and efficiency, failing to accurately simulate practical work processes and conditions, leading to lengthy testing and laborious cleaning procedures.
Innovation Solution
A measuring device with a distribution element for introducing a test aerosol into the workbench's working chamber, featuring external and internal sensors, a dummy replica of an operator, and a movable stand, which allows for realistic simulation of air flow and deflection patterns, enabling efficient and accurate measurement of test medium concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing safety test methods are used, then safety tests can be conducted, but the tests lack realism and do not capture actual work conditions
Solution Approach 1:
The patent uses a dummy replica copying the upper body and arms of a real operator to simulate realistic work processes. This dummy is equipped with sensors and positioned at the workbench to replicate human presence and movements, enabling realistic safety testing without requiring actual operators
Solution Approach 2:
The measuring device acts as an intermediary between the workbench containment system and the test evaluation system. It introduces test aerosol, measures concentration levels through sensors, and processes data to determine containment effectiveness, bridging the gap between physical testing and safety assessment
2Reliability
If existing safety test methods are used, then tests can be performed, but the process is very time-consuming
Solution Approach 1:
The patent replaces manual operator presence and manual measurement procedures with an automated measuring device. The dummy replica with integrated sensors automatically tracks aerosol concentrations and operator exposure levels, eliminating the need for manual data collection and reducing test time while maintaining accuracy
Solution Approach 2:
The measuring device continuously monitors aerosol concentration and operator exposure throughout the entire test process. The dummy replica remains in position and sensors continuously measure, providing uninterrupted data collection that eliminates gaps and repeated setup procedures
3Reliability
If existing safety test methods are used, then containment effectiveness can be assessed, but laborious cleaning of the workbench is required
Solution Approach 1:
The patent extracts the measurement function from the workbench structure itself by using external sensors mounted on the dummy replica. This allows containment assessment without introducing contaminants that would require cleaning, as the measurement system remains separate from the work surface
Solution Approach 2:
The test aerosol used in the patent is designed to be easily dissipating and not require extensive cleaning. The system uses transient test substances that naturally clear from the chamber, eliminating the need for laborious post-test cleaning while maintaining reliable containment assessment
4Reliability
If a dummy replica is introduced to simulate operator, then realistic work conditions are achieved, but device complexity increases
Solution Approach 1:
The dummy replica is segmented into functional components: the upper body structure, the arm mechanisms, and the sensor integration system. This segmentation allows each component to be independently designed and positioned to achieve realistic simulation without requiring a fully detailed human replica
Solution Approach 2:
The dummy replica serves multiple functions simultaneously: it positions sensors at operator height, simulates operator presence for airflow interaction, provides a mounting structure for measurement equipment, and replicates arm movements for realistic workflow simulation. This multi-functionality reduces the need for separate devices for each function
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 enables reliable, time- and effort-efficient safety testing by simulating realistic work processes and conditions, improving occupational safety and reducing the risk of dangerous situations.
Implementation Method 1
The test medium is a liquid or a particulate substance that can be distributed into the working chamber as a test aerosol via the distribution element using compressed air
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
The measuring device (3) is designed for performing safety tests on a workbench (1) configured as a containment and operating in mode. The workbench (1), enclosed by a housing (10), has an internal working chamber (13) with a work surface (12) and a working opening (14) providing access to the working chamber (13). The measuring device (3) has a distribution element (43) for introducing a test medium (Tm) into the working chamber (13) and external sensors (45) for measuring the concentration of test medium (Tm) escaping through the working opening (14). The test medium (Tm) is a liquid or a particulate substance that can be distributed into the working chamber (13) via the distribution element (43) using compressed air as a test aerosol (49). To generate the test aerosol (49), a storage container (4) containing the test medium (Tm) and compressed air fed into the storage container (4) is provided.The test medium (Tm) is a solvent, namely in liquid form, an alcohol such as isopropanol or n-propanol. Alternatively, the test medium (Tm) may be in the form of particulate matter, e.g., potassium iodide or diethylhexyl sebacate (DEHS). The distribution element (43) comprises at least one, preferably several, nozzles (43) positioned on a nozzle carrier (44). The nozzle carrier (44) is displaceable along a transverse axis (xx) along a width of the working chamber (13) and is connected to a slide (34). The slide (34) is arranged on a guide (32). A dummy (35), positioned at least substantially outside the working chamber (13) and facing the working opening (14), is connected to the slide (34). The dummy (35) represents a replica of the upper body of an operator working at the workbench (1), with the side of the dummy (35) facing the working opening (14) serving as a carrier for the external sensors (45).