介绍了各种自动换向装置的工作原理、特点和适用性；

The working principles of all automatic reversing devices, whose characteristics and suitability are discussed respectively, are described.

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介绍了一种自动换向装置，使用该装置后，磨削出的零件达到了图纸要求。

The article introduces one kind of automatic reverse devices. After using this equipment, the components meet the blueprint's request.

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