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1955年前电磁类型的磁铁占主要地位。此后,则趋向于采用永久磁铁。最初所采用的永久磁铁发现磁场强度不高,但不久由于No5铝-镍-钴合金的发展,这种缺点就被迅速地克服了。永久磁铁的磁场强度距圆筒表面2吋处大约可以达到800高斯。电磁铁只是在需要高磁场(大于800高斯)或根据不同类型的矿石需要调整磁场强度时才采用。永久磁铁如果被采用的话,它比电磁铁具有以下的优点:即操作方便、维护费用低,而且安全。采用电磁铁还有另外一个缺点,不是由于圆筒本身的故障,就是因
1955 Magnet type of magnet dominant. Since then, it tends to use permanent magnets. The initial permanent magnet was used to find that the magnetic field strength was not high, but shortly afterwards due to the development of No5 aluminum-nickel-cobalt alloy, this shortcoming was quickly overcome. The magnetic field strength of a permanent magnet can reach 800 gauss at 2 inches from the cylinder surface. The electromagnet is only used when a high magnetic field (greater than 800 gauss) is required or the strength of the magnetic field is adjusted according to the type of ore required. Permanent magnets, if used, have the following advantages over electromagnets: ease of operation, low maintenance, and safety. The use of electromagnets there is another disadvantage, not because of the barrel itself is the fault, that is because