Piston position monitoring device for accumulator, has ultrasonic sensors divided into piezoelectric units and includes surfaces formed on sides facing cylinder wall, where units form longitudinal code in movement direction of piston

摘要

#CMT# #/CMT# The device has ultrasonic sensors (2a, 2b) attached outside of a hydraulic cylinder for impulse-echo-operation. The sensors are divided into piezoelectric units and have surfaces formed on the sides facing a cylinder wall (1). The sensors fit holohedrally at the wall. The piezoelectric units are adhesively applied on a support layer. The piezoelectric units form a longitudinal code in the movement direction of a piston of the cylinder. #CMT#USE : #/CMT# Used in an accumulator of a press equipment for monitoring the position of a piston movable in a hydraulic cylinder. #CMT#ADVANTAGE : #/CMT# The arrangement of the sensor on the cylinder wall requires only small overall height, thus avoiding the need for any design modification of the cylinder. The device permits accurate positioning of the piston in the hydraulic cylinder. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a cross sectional view of a hydraulic cylinder with two senor arrangements. 1 : Cylinder wall 2a, 2b : Sensors 3a, 3b : Ultrasonic signals 4 : Piston 5 : Piston rod.