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Joint Development of Japan's First Anti-Explosive Remotely Operated Mobile Robot
Contributing to Safe and Efficient Data Collection and Inspection in Tunnel Accidents and Petrochemical Plants

Mitsubishi Heavy Industries, Ltd.
Chiba Institute of Technology

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Sakura No. 2 (anti-explosive model)
Anti-explosive mobile robot "Sakura No. 2 "(anti-explosive model) basic specifications
External dimensions L 710 × W 420 × H 540mm (with sub-crawler stored)
Main unit weight 60kg
Travel speed 1.2kph
Climbing angle 45° (climbing and descending possible)
Travel / climb method Joint use of 2 main crawlers and 4 sub crawlers with adjustable angle at the side that can be extended forward or backward.
Continuous operation time 2.5 hours
Remote operation communication distance 100m with wireless operation. 1,000m with wired operation using fiber optic cable reel developed by CIT.
Environmental data collection method Equipped with PTZ camera *3, gas detector
Environmental resistance IP47 (protection against objects with diameter of 1mm or larger and temporary water submersion
Anti-explosive specification Ex px[d] II B+H2 T4 Gb
Internal pressure + pressure resistant anti-explosive method, may be used in inflammable gas including hydrogen and zone 1 areas

*1 The R&D theme "Project to develop systems to handle the social challenges of infrastructure maintenance management and renewal / Infrastructure maintenance management robot technology and non-destructive inspection equipment development / R&D of exploration robots for inflammable gas atmospheres" is a 4-year plan, of which FY2014 to FY2015 was an outsourced project and FY2016 to FY207 is a support project.

*2 Second of three hazardous area classifications: A place in which a hazardous atmosphere is likely to occur in normal operation. Applies to almost all hazardous places other than inside oil tanks (zone 0).

*3 The PTZ camera that can handle Pan (horizontal motion), Tilt (vertical motion), and Zoom (wide to zoom) was successfully incorporated through cooperation with MIYAKI ELECTRIC MFG. Co., Ltd. (Headquarters: Kameoka, Kyoto, President: Koji Kawara).