| 摘要 |
PROBLEM TO BE SOLVED: To provide a processing liquid tank which stores processing liquid discharged from a processing tank of a machine tool and supplies the processing liquid after purification to the processing tank without enlarging excessively an installation area.SOLUTION: A processing liquid tank (10) of the present invention includes a dirty liquid tank (11) which collects and stores processing liquid (7) discharged from a processing tank (2) and in which the lower part (11b) has a smaller horizontal cross section than that of the upper part (11a) in the internal space, and a clean liquid tank which stores the processing liquid purified while being sent from the dirty liquid tank and sends the processing liquid to the processing tank. Preferably, the clean liquid tank includes a first clean liquid tank (12) which stores the processing liquid after purification to be sent to the processing tank and a second clean liquid tank (13) which stores the processing liquid purified while being sent from the dirty liquid tank and sends the processing liquid to the first clean liquid tank. Preferably, processing liquid tank includes liquid sending means (30) which sends the processing liquid from the clean liquid tank or the first clean liquid tank to the dirty liquid tank only when the liquid level (Ld) of the dirty liquid tank is lower than a prescribed liquid level. Preferably, the prescribed liquid level is the liquid level of the clean liquid tank or the liquid level (Lm) of the first clean liquid tank. |
