Cutting fluid filtering device having filter washing function

Abstract

A cutting fluid filtering device having a filter washing function drives a pump to supply a cutting fluid to a filter when the fluid level of a tank that stores the cutting fluid filtered by the filter becomes equal to or lower than a predetermined height. In addition, the cutting fluid filtering device issues an instruction to execute washing of the filter when the operation times of the pump are totalized and the total value becomes equal to or longer than a preset washing operation interval time of the filter.

Description

technical field [0001] The present invention relates to a cutting fluid filtering device used in machine tools to remove chips or sludge mixed in cutting fluid. Background technique [0002] In machine tools, impurities such as chips and sludge generated during machining are mixed into the cutting fluid, which adversely affects the performance and reliability of the machine, so filters are used to remove these impurities. For this filter, cleaning of the filter is performed for the purpose of maintaining purification performance and prolonging life. As the cleaning method, for example, as described in JP-A-2006-272474, JP-A-2006-255833, and JP-A-2001-252847, the direction in which the cutting fluid flows during normal use may be The cutting fluid flows in the opposite direction, and backwashing is performed to remove chips or sludge adhering to the filter from the filter. [0003] Here, the outline of the above-mentioned backwashing operation will be described. First, clo...

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Problems solved by technology

[0012] In the above-mentioned prior art, in order to change the interval (time) from the completion of backwashing of the filter to the next backwashing, it is necessary to change the pressure at which the differential pressure switch 14 operates, or to change the setting of the differential pressure for backwashing. value, or change the value of the timer that determines the backwash interval time, the backwash time cannot be automatically changed according to the degree of filter clogging

Furthermore, although it is described that the compressed air supply time during backwashing is changed according to the degree of filter clogging, adjustment of the interval (time) from the completion of backwashing of the filter to the next backwashing is not considered.

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