Gas turbine temp. measurement automatic stepping mechanism - consists of sector plate with arc line of holes and sensors attached to pivoted radial arm

摘要

The automatic stepping mechanism is designed to operate a test-position selector for temp measurements on gas turbine propulsion units. It comprises a sector plate (12) with a line of holes arranged on an arc (21). The temp sensor or group of sensors is attached to a radial arm (10) pivotted to the plate. The upper end of the arm is attached to a double-acting pneumatic cylinder (16) whose piston rod is attached to the upper end of a second arm (13) pivotted at the same point as the first. A slotted extension engages with a dowel (14) on the main arm. Both arms have double-acting cylinders with indexing bolts (22, 23) which engage with the holes in the plate. Limit switches on the plate (50, 51) and on the arms are connected to a logic unit which controls the stepping sequence.