| 摘要 |
PURPOSE:To measure continuously with high accuracy a particle size under the environment where dust exists, by providing a mobile mechanism which can move forward and backward, on a particle size measuring instrument for radiating a microwave, and measuring the intensity of a reflected wave which is reflected from a granular body. CONSTITUTION:A waveguide 2 fixed by a supporting plate 9 is contained in the inside of a probe 1 connected to a microwave transmitter-receiver 8, and the tip of the waveguide 2 becomes an electromagnetic horn antenna 7. Also, in order to prevent particles 10 and dust, etc. from invading the inside of the waveguide 2 in the course of a measurement, the tip of the waveguide is covered by using a material 4 such as quartz glass, etc. for making a microwave transmit through. This particle size measuring instrument and a protector 5 for protecting the probe 1 are placed on the side wall 11 of a passage to which a particle group drops down, and the tip part is inserted into the particle group. In this way, this instrument can move forward and backward freely by a piston 6 which is moved by a mobile mechanism such as an electrically-driven cylinder, a hydraulic cylinder, etc., by which a particle size can be measured in an optional position.
|
