| 摘要 |
<p>The doser (1) includes a screw (3) with a cylindrical envelope (30) and a body (4) with a chamber (5) which houses the screw and is filled with glass microbeads (2). The chamber presents an input opening (6) and an output opening (7) for delivering the microbeads. An actuator (9) rotates the screw around its axis (3E) while a guide (8) is provided in the body to direct the screw rotation along its axis (3E). A cylindrical bore (11) in the body houses an envelope (10) which can be easily replaced when worn.</p> |
