Continuous Hydrogen Pulverization Device for Rare Earth Permanent Magnetic Alloy
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Solution Overview
Problem
Conventional hydrogen pulverization devices for rare earth permanent magnetic alloys face challenges in collecting magnetic powder under inert gas protection, have low cooling speeds, long operation periods, and high power consumption, along with transmission part deformation and short life due to hotspot placement.
Innovation Solution
A continuous hydrogen pulverization method and device that involves a tall and thin feeding tank hung on a transmission device, with a process that includes hydrogen adsorption, dehydrogenation, and cooling under vacuum and inert gas protection, using isolation valves to connect rooms in series, and inert gas circulating cooling to improve efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional rotary hydrogen pulverization furnace is used, then the magnetic powder can be processed, but it is difficult to collect the magnetic powder under the protection of inert gases
Solution Approach 1:
The furnace is divided into three separate rooms (hydrogen adsorption room, heating dehydrogenation room, and cooling room) connected in series, allowing each room to perform a specific function independently. This segmentation enables the magnetic powder to be processed and collected in separate stages under appropriate protective atmospheres, solving the collection difficulty.
Solution Approach 2:
The patent uses inert gas circulation in the cooling room to protect the magnetic powder during cooling and collection. The inert gas atmosphere prevents oxidation and facilitates easy collection of the magnetic powder without exposure to air, directly addressing the collection difficulty under protective atmosphere.
2Speed
If a conventional rotary hydrogen pulverization furnace is used, then the processing can be completed, but the cooling speed is low
Solution Approach 1:
The patent introduces a gas circulation cooling system using inert gas flow through the cooling room. This pneumatic cooling method significantly increases the cooling speed compared to conventional passive cooling, reducing the cooling time while maintaining protective atmosphere.
3Productivity
If a conventional rotary hydrogen pulverization furnace is used, then the processing can be completed, but the operation period is long that may take dozens of or even over thirty hours
Solution Approach 1:
The three rooms are connected in series and operate continuously with material flowing from one room to the next. The hydrogen adsorption room operates continuously, followed by heating and cooling stages, eliminating idle time between operations. This continuous process dramatically reduces the total operation period from dozens of hours to a much shorter duration while increasing production capacity.
4Temperature
If an external-heating muffle furnace is used, then the heating can be performed, but it takes a lot of power
Solution Approach 1:
The patent extracts the heating function from a separate external muffle furnace and integrates it directly into the heating dehydrogenation room. This allows for more efficient heat transfer and reduced energy loss, lowering power consumption while maintaining the required heating temperature for dehydrogenation.
5Ease of operation
If transmission parts are placed in a hotspot area, then the feeding mechanism can operate, but the transmission parts experience deformation and short life
Solution Approach 1:
The patent extracts the transmission mechanism from the high-temperature hotspot area and places it in a separate cooling room or ambient temperature zone. This separation protects the transmission parts from thermal deformation and extends their service life while maintaining continuous feeding operation through the connected room system.
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 enhances the consistency and performance of the rare earth permanent magnetic alloy powder, reduces oxygen content, increases production capacity, and extends the life of transmission parts while saving power, resulting in improved product quality and reduced maintenance needs.
Implementation Method 1
filling with hydrogen to 0.5-0.15 MPa after a vacuum pressure is lower than 50 Pa or a volume content of oxygen is less than or equal to 0.1%, keeping for 10 ∼120 min
Implementation Method 2
heating when the pressure in the heating dehydrogenation room is less than 0.1 Pa, a highest heating temperature is 500 ∼900° C. with a heating time of 4 ∼20 h
Implementation Method 3
starting a fan for driving the inert gases into a vent tube of the feeding tank through a cambered deflector on an internal wall of the cooling room; after the inert gases enters the vent tube, cooling the feeding tank and the alloy slices in the cooling room with the inert gases
Implementation Method 4
cooling the heated inert gases by a heat exchanger before being blown to the cambered deflector for providing inert gas circulating cooling
Data Source
AI summary
A continuous hydrogen pulverization method of a rare earth permanent magnetic alloy includes: providing a hydrogen adsorption room, a heating dehydrogenation room and a cooling room in series, applying hydrogen adsorption, heating dehydrogenation and cooling on a rare earth permanent magnetic alloy in the production device at the same time, wherein collecting and storing under an inert protection atmosphere can also be provided. Continuous production is provided under vacuum and the inert protection atmosphere in such a manner that an oxygen content of the pulverized powder is low and a proportion of single crystal in the powder is high.