Generally, a voltage is added to the displacement sensor, and its excellent smoothness is used to detect the voltage division ratio of the output voltage (the output resistance changes the output voltage). Bian Xiao simply analyzed the use of displacement sensors by collecting and sorting out linear displacement sensors and magnetostrictive displacement sensors as examples.
(1) Use of linear displacement sensor;
The precision linear displacement sensor produced by MINOR Company is a potentiometer sensor with long continuous conductive track, which is suitable for absolute displacement sensing in control and measurement, and its linear accuracy is 0.05%. It has the characteristics of fast action and long service life, and meets the control requirements of gantry precision oil press.
According to the actual needs, Kl slide plate and KTC pull rod linear displacement sensors are installed on the main cylinder and hydraulic pad of the hydraulic press respectively. In the semi-automatic working process, the master cylinder and hydraulic pad of the hydraulic press respectively drive two linear displacement sensors to move, and the acquired two-point analog values are input to FX2N-8AD, which converts the analog input values (voltage input at this time) into digital values and transmits them to the PLC host. The effective measuring lengths of linear displacement sensors of master cylinder and hydraulic pad are 500mm and 400mm.