METHOD AND DEVICE FOR EFFECTING TEMPERATURE COMPENSATION IN LOAD CELL TYPE LOAD DETECTOR

摘要

THE APPARATUS FOR EFFECTING TEMPERATURE COMPENSATION IN A LOAD CELL TYPE LOAD DETECTOR (2) IS FOR A LOAD DETECTING APPARATUS HAVING A LOAD CELL CONSTITUTING THE LOAD DETECTOR FORMED WITH A STRAIN GAUGE (14) ATTACHED TO A DEFLECTABLE BODY (13), A MOUNT BASE (3) FOR POSITIONING THE LOAD DETECTOR, AND A LOAD GENERATING SECTION (6) TO RECEIVE A FLOW OF OBJECTS TO BE MEASURED. THE APPARATUS INCLUDES A PAIR OF THERMAL SOURCE BLOCKS (15, 16) PROVIDED SO AS TO BE DIRECTLY IN CONTACT WITH THE DEFLECTABLE BODY (13) AND BE DISPOSED RESPECTIVELY AT TWO SYMMETRIC POSITIONS WITH RESPECT TO THE CENTER OF THE LOAD DETECTOR, A PAIR OF TEMPERATURE SENSORS (10, 11;19) PROVIDED RESPECTIVELY TO THE THERMAL SOURCE BLOCKS (15, 16), A CONTROLLER (12; 19) FOR CONTROLLING THERMAL ELEMENTS (8, 9;51, 52) BASED ON TEMPERATURES DETECTED BY THE TEMPERATURE SENSORS SUCH THAT A TEMPERATURE OF THE LOAD CELL TYPE LOAD DETECTOR (2) MAY BE MAINTAINED AT A PREDETERMINED CONSTANT TEMPERATURE. THE METHOD IS CARRIED OUT BY CONTROLLING A TEMPERATURE OF THE LOAD CELL TYPE LOAD DETECTOR SUCH THAT THE TEMPERATURE OF THE LOAD CELL TYPE LOAD DETECTOR (2) IS NOT AFFECTED BY ENVIRONMENT TEMPERATURE CHANGES. (FIGURE 2)