| 摘要 |
PURPOSE: A powder feeding track structure of a coil spring-type powder feeding apparatus is provided to enhance the feeding efficiency of powder by the rotation of a rectangular spring-type powder feeding spring in a powder feeding pipe. CONSTITUTION: A powder feeding track(100) structure of a coil spring-type powder feeding apparatus comprises a powder feeding pipe(110) and a powder feeding spring(120). The powder feeding pipe comprises inner and outer pipes(111,112), a frame spring(113) and foaming agent(114). The inner pipe is formed from the Teflon material. The outer pipe surrounds the outer periphery of the inner pipe. The frame spring is accommodated between the inner and outer pipes. The foaming agent is filled in the space between the inner and outer pipes. The powder feeding spring is accommodated in the hollow space of the inner pipe. A Teflon coating layer is formed at the metal coil spring of a rectangle section.
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