| 摘要 |
PURPOSE: A powder transfer pipe structure is provided to ensure high wear resistance corresponding to the rotation force of a powder transfer spring by forming the inner pipe from Teflon material. CONSTITUTION: A powder transfer pipe(100) structure comprises an inner pipe(110), an outer pipe(120), a coil spring(130) and foaming agent(140). The inner tube has a hollow cylinder shape. The inner tube is formed from the Teflon material. The outer pipe surrounds the outer periphery of the inner tube. The outer pipe is formed in the form of a bellows tube. The coil spring is accommodated between the inner and outer tubes. The coil spring surrounds the outer periphery of the inner tube. The foaming agent is filled in the space between the inner and outer tubes.
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