Foreign material detection method of pulp suspension and foreign material detection device of pulp suspension

摘要

A foreign material detection device for pulp suspension, comprising: a pulp suspension passage (4) through which a pulp suspension passes, a pulp suspension introduction passage (5) for connecting an end of the pulp suspension passage (4) to introduce an electric pulp suspension, and the pulp On the inlet opening / closing means 7 for opening and closing the suspension introduction passage 5, the inlet opening and closing control means 8 for opening and closing the introduction side opening and closing means 7, and the other end of the pulp suspension introduction passage 5. Connected to separate the electric pulp suspension into foreign matter and effective fibers through the screen 91 and at the same time the inlet side of the electric screen 91 to the primary chamber 92 and the outlet side of the screen 91 to the secondary chamber 93. One separating means 9, a discharge passage 10 for discharging the electrically effective fiber separated by the separating means 9 from the secondary chamber 93 of the separating means 9, and the discharge passage 10. Discharge side opening and closing means (11) for opening and closing, discharge side opening and closing control means (12) for opening and closing the discharge side opening and closing means (11), and Foreign material discharge passage 14 for discharging electric foreign matter from the primary chamber 92 of the means 9, foreign material discharge side opening and closing means 15 for opening and closing the foreign material discharge passage 14 and the foreign material discharge side opening and closing means ( 15, the water supply passage 16 for supplying water to the primary chamber 92 of the separating means 9, and the water supply passage 16 Connected to the water supply-side opening and closing means 17 for opening and closing, the water supply-side opening and closing control means 18 for opening and closing the water supply-side opening and closing means 17, and the primary chamber 92 of the separating means 9, respectively. A circulation passage 20 for circulating water containing electric foreign matter in the vehicle compartment 92, a circulation side opening and closing means 21 (21 ') for opening and closing the circulation passage 20, and this circulation side opening and closing means [21] (21 ')] circulation side opening / closing control means (22 (22')] for opening and closing control, the inspection part 25 which inspects the electric foreign material in the circulation passage 20, and the electric foreign material of this inspection part 25 is detected. Detecting means (3 2) It is prepared.