| 摘要 |
PROBLEM TO BE SOLVED: To provide a cleaner for new coolant that is advantageous in performing a cleaning easily in an abrasive grain precipitation tank (secondary coolant tank). SOLUTION: In a piping passage connecting a primary coolant tank 15 with an abrasive grain tank 11 comprising a device having following both piping combined; a delivery pipe 23 rising vertically from a coolant discharge port 30 of a coolant pump 13 for coolant circulation and a coolant pipe 32 in the vertical direction which runs from the upper surface of the abrasive grain precipitation tank 11 into an optional coolant level 31 in the coolant within the abrasive grain precipitation tank 11, normally the coolant stored in the primary coolant tank 15 is fed under pressure into the abrasive grain precipitation tank 11, however, when the coolant pump 13 for coolant circulation under operation is stopped, the coolant is caused to flow backward by utilizing the siphon phenomenon and the coolant is automatically discharged outside the abrasive grain precipitation tank 11 to a depth of the coolant pipe 32.
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