DEVICE AND METHOD FOR FILTERING TREATING LIQUID IN TREATING TANK

摘要

A device for filtering treating liquid in a treating tank can reliably remove foreign substances in the treating tank. The device has an opening (6) for recovering a surface-layer treating liquid (1) on the workpiece unloading side of the treating tank (2), a separating section (4) for recovering an intermediate-layer treating liquid (1) on the workpiece loading side of the treating tank (2), a hopper (5) for recovering a bottom-layer treating liquid (1) on the bottom surface on the workpiece loading side of the treating tank (2), a first treating liquid discharging nozzle (15) mounted on the bottom surface (8) of the treating tank (2) and oriented in the direction which is opposite a workpiece conveying direction and is toward the bottom surface (8), second treating liquid discharging nozzles (19) mounted to opposite side surfaces of the treating tank (2) and oriented in the direction which is opposite the workpiece conveying direction and is toward a workpiece, cyclone devices (25, 31, 44, 50, 65) for filtering the treating liquids (1) recovers at the opening (6), the separating section (4), and the hopper (5) and individually separating foreign substances, a separating tank (60) for containing mainly the foreign substances separated by the cyclone devices (25, 31, 44, 50, 65), and a screw conveyor (62) for separating only foreign substances from the foreign substances contained in the separating tank (60) and from the treating liquids (1) and discharging the foreign substances.