Ultrasonic Screw Feeder for Titanium Chip Decontamination
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Solution Overview
Problem
Current methods for treating titanium machining chips are inefficient, requiring large volumes of hot water and caustic chemicals, generating hazardous waste, and involving high treatment costs, while alternative methods like enzymatic agents or acid treatments pose environmental and disposal concerns.
Innovation Solution
A system using an ultrasonic transducer and a rotating screw feeder to create a slurry with particulate solids and water, where the ultrasound signal agitates contaminants to separate from the solids, reducing the need for high temperatures and chemical reagents, and allowing for mild detergent use and efficient recycling of the cleaning solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot water with high levels of caustic cleaning agents is used to wash contaminated chips, then cleaning effectiveness is improved, but the amount of hazardous waste and treatment cost increase
Solution Approach 1:
The patent replaces chemical cleaning mechanisms (caustic agents) with ultrasonic mechanical vibration. The ultrasonic transducer generates high-frequency vibrations that create cavitation bubbles in the water, which mechanically disrupt and remove contaminants from chip surfaces without requiring harsh chemicals.
Solution Approach 2:
The patent changes the physical parameters of the cleaning process by using ultrasonic frequency vibrations (typically 20-100 kHz) instead of thermal and chemical parameters. This transforms the cleaning mechanism from thermally-driven chemical reactions to mechanically-driven cavitation and micro-streaming.
2Reliability
If scalding hot water is used for cleaning, then cleaning effectiveness is improved, but energy consumption and treatment cost increase
Solution Approach 1:
The patent substitutes thermal energy with ultrasonic mechanical energy. Instead of heating water to scalding temperatures to enhance cleaning, the system uses ultrasonic transducers to generate mechanical vibrations that directly agitate and remove contaminants at ambient or mild temperatures.
Solution Approach 2:
The patent fundamentally changes the energy parameter from thermal (high temperature) to mechanical (ultrasonic vibration frequency). This parameter transformation allows effective cleaning to occur at much lower temperatures, dramatically reducing energy consumption for water heating.
3Reliability
If strong nitric and hydrofluoric acid solution is used for chemical treatment, then contaminant removal is improved, but environmental hazard and disposal difficulty increase
Solution Approach 1:
The patent replaces chemical dissolution mechanisms (acid attacks) with ultrasonic mechanical cavitation. The cavitation bubbles collapse near the chip surfaces, creating localized high-pressure jets that mechanically dislodge and remove contaminants without chemical reactions, eliminating the need for hazardous acids.
Solution Approach 2:
The patent uses water as a disposable, non-hazardous cleaning medium instead of expensive and hazardous chemical solutions. The water can be easily disposed of or recycled without special handling requirements, replacing the need for costly acid waste treatment and disposal systems.
4Reliability
If a large volume of water is used for washing, then cleaning effectiveness is improved, but water consumption and by-product volume increase
Solution Approach 1:
The patent employs ultrasonic mechanical vibration to intensify the cleaning action per unit volume of water. The high-frequency vibrations create cavitation bubbles throughout the water, which mechanically impact contaminant particles, allowing effective cleaning with significantly reduced water volumes compared to conventional washing.
Solution Approach 2:
The patent changes the intensity parameter of the cleaning process by introducing ultrasonic frequency vibrations. This parameter change increases the energy density and cleaning efficiency per unit volume of water, enabling the same cleaning effectiveness with much lower water consumption.
5Temperature
If enzymatic agents are used for treatment, then temperature requirements are reduced, but cost increases due to expensive enzymes
Solution Approach 1:
The patent replaces biological enzymatic mechanisms with physical ultrasonic cavitation. Instead of using expensive enzymes that require mild temperatures to function, the system uses ultrasonic vibrations that are equally effective at low temperatures but involve no biological materials, eliminating enzyme purchase and disposal costs.
Solution Approach 2:
The patent uses water as a simple, inexpensive cleaning medium instead of costly enzymatic agents. Water requires no purchase, storage, or disposal infrastructure beyond basic facilities, making it far more economical than enzymatic solutions while maintaining low temperature operation.
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
This method effectively reduces water and chemical usage, minimizes by-product generation, and maintains a neutral pH, enabling efficient contaminant removal and recycling, thus lowering treatment costs and environmental impact.
Implementation Method 1
an ultrasonic transducer producing an ultrasound signal... the particulate solids contained within a chamber disposed within the active region of the ultrasound signal being sufficiently agitated by the ultrasound signal to cause contaminants to separate from the particulate solids
Data Source
AI summary
System and method for treating particulate solids comprises a processor for providing contaminated particulate solids at a predetermined apparent density and a screw feeder for transporting a water-based slurry of the contaminated particulate solids through an ultrasound signal of sufficient size, strength and duration to cause the contaminants to separate from the particulate solids. One or more stacks of ultrasonic transducers arranged around the screw feeder may be employed in which the diameter of each transducer preferably is substantially the same as the pitch of the screw feeder.