Cooling medium spray device

A cooling medium spray device that increases a pressure of a cooling medium supplied from a main shaft of a machine tool and sprays the cooling medium, comprising:

• a body part, a support part, a pump, a cap, a nozzle, a rotation stopping device and a force detecting device,
• wherein:
• the body part is removably attachable to the main shaft, and has a body part passage through which the cooling medium supplied from the main shaft passes in a state in which the body part has been attached to the main shaft,
• the support part has a support part interior space in which the body part is rotatably disposed, a first passage and a second passage, the first passage communicating with the body part passage,
• the pump includes a rotary part that is connected to the body part and is rotatably disposed in the support part interior space of the support part, an inlet part that communicates with the first passage of the support part, and an outlet part that communicates with the second passage of the support part, the pump being configured such that, by rotating the rotary part, the pressure of the cooling medium that is being suctioned from the inlet part is increased such that pressurized cooling medium is discharged from the outlet part,
• the cap is disposed at a location of the support part that is on a first side of the pump in an axial direction so as to close the support part interior space of the support part, and the cap has a cap passage that communicates with the second passage of the support part and a nozzle mounting hole that communicates with the cap passage,
• the nozzle is mounted in the nozzle mounting hole of the cap, and the nozzle has a spray hole configured to spray the cooling medium and a nozzle passage that communicates with the nozzle mounting hole,
• the rotation stopping device includes a pressing member that is provided on the support part, the rotation stopping device being configured such that, in the state in which the body part has been attached to the main shaft, the support part is prevented from rotating around the body part by abutment of the pressing member on an abutment part provided on the machine tool, and
• the force detecting device includes a force detecting sensor configured to output a force detection signal indicating a force with which the pressing member is pressing against the abutment part.