Device and method for filtering processing liquid in processing tank

摘要

A device for filtering a processing liquid in a processing tank includes an opening for recovering a surface-layer processing liquid on a work-discharging side of the tank, a separating part for recovering an intermediate-layer processing liquid on a work-receiving side of the tank, a hopper for recovering a bottom-layer processing liquid on a bottom surface on the work-receiving side, a first processing liquid discharge nozzle on a bottom surface of the tank and which is oriented in an opposite direction to a work-conveying direction and toward the bottom surface, second processing liquid discharge nozzles on both side surfaces of the processing tank and which are oriented in an opposite direction to the work-conveying direction and toward a work, cyclone devices which filter the processing liquids recovered by the opening, the separating part, and the hopper, and which individually separate foreign material, a separating tank, and a screw conveyor.

主权项

1. A device for filtering a processing liquid in a processing tank in which a conveyed work is immersed in the processing liquid to be processed,
an inclined part is formed on a work-discharging side of the processing tank; an opening for extracting foreign material for collecting a surface-layer processing liquid including a foreign material with a small specific gravity suspended on the processing liquid which faces from a work-receiving side to the work-discharging side of the processing tank is formed on an upper surface of the work-discharging side of the processing tank, the foreign material with the small specific gravity being foreign material with specific gravity that causes the foreign material to be suspended at the surface-layer of the processing liquid in the processing tank; a separating part for collecting an intermediate-layer processing liquid including a foreign material with a relatively low specific gravity suspended on the processing liquid which faces from the work-discharging side to the work-receiving side of the processing tank is formed on an upper surface of the work-receiving side of the processing tank, the foreign material with the relatively low specific gravity being foreign material with specific gravity that causes the foreign material to be suspended between the surface-layer of the processing liquid and a bottom of the processing liquid in the processing tank; a hopper for collecting a bottom-layer processing liquid including a foreign material with a high specific gravity is formed on a bottom surface on the work-receiving side of the processing tank, the foreign material with the high specific gravity being foreign material with specific gravity that causes the foreign material to settle to the bottom of the processing liquid in the processing tank; a grooved part having a plurality of concave and convex shapes is formed toward the hopper in a work-conveying direction at least on the bottom surface of the processing tank which continues to the inclined part, a cross section of the grooved part is elliptical shaped so as to define a major axis and a minor axis in which a ratio of the major axis and the minor axis is from 1:1 to 8:1, and a height is equal to or shorter than one half of the minor axis, or the cross section is formed in a serrated shape and the convexities are ridges and the concavities are valleys, and an angle of each of the valleys is between 90° and 165°; first processing liquid discharge nozzles which are oriented in an opposite direction to the work-conveying direction and toward the bottom surface are arranged to opposing a center of the concavities of the grooved part; second processing liquid discharge nozzles which are oriented in the opposite direction to the work-conveying direction and toward the conveyed work are arranged on both side surfaces of the processing tank; and a wall surface for collecting the surface-layer processing liquid including the foreign material with the small specific gravity suspended at the inclined part formed on the work-discharging side of the processing tank from a reversed flow of the processing liquid that is generated when the processing liquid which is sprayed from the second processing liquid discharge nozzles toward the inclined part collides with the separating part of the processing tank, wherein the device for filtering the processing liquid in the processing tank comprises: first separating means which respectively separate the foreign material from the processing liquids recovered by the opening for extracting foreign material, the separating part, and the hopper, wherein the first separating means are connected to the opening for extracting foreign material, the separating part, and the hopper by a pipe; a separating tank for storing a processing liquid with foreign material separated by the first separating means, wherein the separating tank is connected to the first separating means by a pipe; second separating means which separate only the foreign material from the processing liquid stored in the separating tank and return the separated foreign material from the processing liquid to the separating tank, wherein the second separating means is connected to the separating tank; and discharging means which separate only the foreign material from the processing liquid stored in the separating tank and which discharge the foreign material, wherein the processing liquid which is separated from the foreign material by the first and second separating means is sprayed into the processing tank by the first processing liquid discharge nozzles and the second processing liquid discharge nozzles which are connected to the first and second separating means by pipe, wherein the first separating means and the second separating means are connected to the second processing liquid discharge nozzles by pipe, and the first separating means are connected to the first processing liquid discharge nozzles by pipe.