| 摘要 |
A method and apparatus for regulating the flow of plastic particulates to the opening of a cylinder of a plasticating screw. The particulate pass through a feed throat disposed at a feed opening of the drum. A valve mechanism disposed in the feed throat includes upper and lower members connected by pivot means. A fulcrum is located below the pivot means and the lower member bears on the fulcrum. The upper member is moved up or down which in turn causes the lower member bearing on the fulcrum to swing about the pivot means to open or close the valve. As the valve is closed, the lower member moves downwardly towards the rotating screw to prevent flooding with particulates of the feed opening of the cylinder.
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