STRAIN-MEASURING FORCE CELL FOR DYNAMOMETER TESTING OF WELL SUCKER-ROD PUMPS Russian patent published in 2004 - IPC

FIELD: force-measuring equipment, measurement of force applied to polished rod of sucker-rod deep-well pumping unit. SUBSTANCE: force cell has body, three springy members with resistance strain gauges coming in the form of cylindrical bars with spherical butts positioned in guiding pits of body and spaced 120 degrees apart along circumference. Two loading and two compensation resistance strain gauges are placed in pairs on opposite sides of each springy member. All resistance strain gauges are connected in bridge circuit that ensures summation of loads of all three springy members. EFFECT: ensured high measurement sensitivity of force cell, independence of measurement results from nonflatness of reference surfaces. 3 dwg