Tool Spray Nozzle for Binding Respirable Dust
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Solution Overview
Problem
Existing power tools with spray devices for dust control are ineffective in reducing the respirable fraction of fine dust particles, which are harmful to health, and often require external water supply systems, limiting their usability.
Innovation Solution
A tool with a spray device featuring a first spray nozzle emitting liquid droplets between 40 and 150 μm at a pressure of 5 to 8 bar, and a second spray nozzle for cooling and lubrication, both designed to reduce fine dust exposure by binding and capturing dust particles effectively, with the ability to operate independently of external water supply systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spray nozzles are arranged on the entry side of the cutting wheel with pressure of 2-4 bar, then cooling and dust binding are provided, but the respirable fraction of fine dust is not effectively bound
Solution Approach 1:
The patent changes the pressure parameter from 2-4 bar to at least 5 bar, and adjusts the spray droplet size to between 40 and 150 μm. These parameter changes enable the spray jet to effectively bind the respirable fraction of fine dust particles that were not bound by previous lower pressure systems.
Solution Approach 2:
The spray nozzles are arranged on the entry side of the cutting wheel, allowing the spray jet to act on dust particles before they are fully generated and dispersed by the cutting process. This preliminary action prevents fine dust from entering the atmosphere rather than attempting to bind it after generation.
2Ease of operation
If spray device requires external water supply system, then sufficient water pressure can be maintained, but the tool can only be used where line system is available
Solution Approach 1:
The patent integrates a water tank and pump system directly into the tool, allowing it to generate its own water supply at the required pressure of at least 5 bar. This self-service capability eliminates dependency on external water line systems, enabling the tool to be used anywhere without infrastructure constraints.
3Object-affected harmful factors
If spray pressure is increased to at least 5 bar, then respirable fine dust can be bound, but energy consumption and system complexity increase
Solution Approach 1:
The patent combines the dust binding spray function with the cooling function into a single integrated spray system. The same high-pressure spray jet (at least 5 bar) performs both dust binding and cooling of the cutting wheel, eliminating the need for separate systems and reducing overall energy consumption.
Solution Approach 2:
The spray device is designed to perform multiple functions simultaneously: binding respirable fine dust particles, cooling the cutting wheel, and lubricating the cutting process. This multi-functionality at high pressure (at least 5 bar) maximizes the effectiveness of the 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 significantly reduces the exposure to fine dust particles, particularly the respirable fraction, by effectively binding and capturing dust particles, while also improving machining speed and tool longevity through efficient cooling and lubrication, and can operate without external water supply lines.
Implementation Method 1
a first spray nozzle (37) for binding dust, the first spray nozzle (37) emitting a first spray jet with liquid droplets between 40 and 150 μm
Implementation Method 2
the pump (36) generates a pressure of 5 to 8 bar in the first connecting line (38)
Implementation Method 3
a second spray nozzle (39) for cooling the processing tool (12), the second spray nozzle (39) emitting a second spray jet
Implementation Method 4
a second spray nozzle (39) for cooling and lubricating the processing tool (12)
Data Source
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AI summary
The invention relates to a tool apparatus (10) for machining a workpiece (23), comprising a machining tool (12), which can be rotated about a rotational axis (15) in a direction of rotation (14) by a driving device (13), a protective hood (25), which at least partially surrounds the machining tool (12), and a spraying device (11) having a first spraying nozzle (37), which is arranged on a side (32) of the machining tool (12) exiting the workpiece (23).