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Function of liquid magnets
Nov 24,2021
In mechanical manufacturing, the seal between the shaft and the body usually uses rubber or other elastic material oil seal. This structure has a short life and poor reliability, and is even more unsuitable in situations where there is radioactivity, corrosiveness, toxicity and high friction. However, by simply putting a few drops of ferromagnetic liquid between the shaft and the body, keeping them there and magnetizing them with a ring magnet, it becomes a liquid magnet sealer.
The liquid magnet sealer completely excludes the contact between the shaft and the body, thus greatly reducing friction; at the same time, it works reliably for a long time because the frictional ferromagnetic liquid loss is very low. If it is used for sealing of vacuum devices, the vacuum level can be maintained at 10 billionths of a millimeter of mercury, which can really be called seamless. All mechanical devices use lubricants to reduce friction. The usual mechanical "swimming" in oil can be avoided if a ferromagnetic liquid lubricant is used. The solution is to magnetize part of the ball of the bearing, which not only preserves the ferromagnetic fluid, but also makes it always work in the friction zone due to the attraction of the ball's magnetic field. This can reduce friction and improve the service life of the bearing, and the machinery will not produce noise.
People may ask: Since there are ferromagnetic particles in the lubricating oil, won't it wear out the mechanical parts? No, because the size of the ferromagnetic particles in the lubricant is 10,000 times smaller than the particles produced by mechanical wear.
Using the property that the specific gravity of ferromagnetic liquid changes with magnetization, it is possible to make an ideal concentrator that can not only take out all valuable substances from poor ore, but even separate different grades of the same metal ore.
Under the action of the magnetic field, the ferromagnetic liquid can also change viscosity, and can be together until it becomes "hard". This gives liquid magnets a broader range of applications. For example, liquid magnets have been used to adjust the elasticity of cars according to road conditions. And when liquid magnets are used to make robot "hands", they are even more flexible and can stretch smoothly. The most interesting thing is that, such as the use of liquid magnets to fasten the machine tool processing of complex parts, as long as the parts are placed in the ferromagnetic liquid, electromagnetic field, the ferromagnetic liquid will instantly become thick, until solidified into a hard stone like, firmly fasten the parts; wait until the processing is completed, just disconnect the current, the ferromagnetic liquid and back to normal, the parts can be freely removed!
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