US 12,005,569 B2
Moisture intrusion detection system and moisture intrusion detection method
Hiroyuki Sugiura, Aichi (JP)
Assigned to OKUMA CORPORATION, Aichi (JP)
Filed by OKUMA Corporation, Aichi (JP)
Filed on Mar. 20, 2020, as Appl. No. 16/824,738.
Claims priority of application No. 2019-055377 (JP), filed on Mar. 22, 2019.
Prior Publication US 2020/0298418 A1, Sep. 24, 2020
Int. Cl. B25J 13/08 (2006.01); B25J 17/02 (2006.01); B25J 19/02 (2006.01); G01N 27/60 (2006.01)
CPC B25J 13/087 (2013.01) [B25J 17/02 (2013.01); B25J 19/02 (2013.01); G01N 27/605 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A moisture intrusion detection system comprising:
an industrial robot that has a closed space defined thereinside;
an air supply mechanism that supplies compressed air to the closed space;
an air vent passage that is provided in the industrial robot to establish communication between an external space outside the industrial robot and the closed space, and guides, to the external space, air ejected from the closed space upon supply of the compressed air;
a humidity sensor that is disposed external to the industrial robot and detects a humidity of ejected air that is ejected from the air vent passage to the external space upon supply of the compressed air; and
a controller that determines presence or absence of moisture intruding into the closed space based on a detected humidity of the ejected air, the detected humidity being detected by the humidity sensor,
wherein
the controller causes the air supply mechanism to continue to supply the compressed air for at least a predetermined reference time, and determines presence or absence of moisture intruding into the closed space according to a detected humidity that is detected at a determination timing after a lapse of at least the reference time from a start of the supply of the compressed air, and
the reference time is the time during which the supplied compressed air passes through the closed space and is then output from the air vent passage.