Chip filtering system and chip filtration method thereof

A chip filtering system, comprising:

• a water tank configured to contain a cutting fluid;
• a nozzle disposed in the water tank;
• a filter;
• a nozzle pump connected to the nozzle;
• a filter pump connected to the filter;
• a concentration sensor configured to sense a chip concentration of the cutting fluid;
• a controller electrically connected to the nozzle pump, the filter pump and the concentration sensor and configured to:
• determine whether the chip concentration is equal to or greater than a preset concentration;
• when the chip concentration is equal to or greater than the preset concentration and a chip density of a chip in the cutting fluid is equal to or greater than a preset density, increase a rotational speed of the nozzle pump;
• and
• when the chip concentration is equal to or greater than the preset concentration and the chip density of the chip is less than the preset density, increase a rotation speed of the filter pump.