Overload protection device

Details Overload protection device Overload protection device

B - Operations, Transporting

25

J

342/12, 342/38

B25J 19/06 (2006.01)

Patent

CA 1275476

OVERLOAD PROTECTION DEVICE Abstract of the Disclosure An overload protection device adapted to be secured between a robot arm and a tool, comprises a floating piston (20) within a cylinder (18). Hall effect sensors (124) are spaced around the cylinder wall and mating magnets (40) are spaced around the piston wall. The cylinder is pressurized to axially align the piston with the cylinder and to position each magnet in alignment with a sensor. Then an overload occurs involving either the robot arm or the tool, the magnets are moved relative to the sensors causing the sensors to signal for depres- surization of the cylinder. An electronic system (Figure 27) responsive to the Hall effect sensor signals lights an "overload" LED D1 and triggers a timer circuit T1 which generates a timing pulse of fixed duration. During the duration of the timing pulse, the robot is de-energized. A red LED R is illuminated indicating the robot system is not ready to be operated. Also, a solenoid valve L1 is energized, cutting off the pressure to the cylinder.

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