13/50 5.2 Basic Methods of Force Measurement 4.Transducing the force to a fluid pressure and then Load measuring the pressure. Loading head Hardened steel ball >Hydrostatic(流体静力学) cells:hydraulic cell is completely Soft rubber Clamp ring filled with oil and usually have a Flexible preload pressure of the order of boot 30 lb/in2. Box- -Clamp >Application of load increases Stayplate the oil pressure which is read on Preload an accurate gage. Gauging spring hole Bridge ring 》 Electrical pressure Base transducer can be used to Casing Hardened steel obtain an electrical signal. ring inserts The cells are very stiff. Hydrostatic load cell (4) 14/50 5.2 Basic Methods of Force Measurement SKETCH 4 SCHEMATIC HYDROSTATIC LOAD CELL 4.Transducing the force to a fluid pressure and STAYPLATE-FORCE then measuring the pressure. CYLINDER The figure illustrates the Emery Winslow Model WALL PISTON 136 -75,000 Ib.load cell used in truck scale DIAPHRAGN applications.This hydrostatic cell type is also used in high capacity tank weighing,floor scales and custom applications FL LOAD CELL BASE GROSS SECTION OF HYDROSTATIC LOAD CELL (MODEL 136) http://emerywieclow CENTERING K一BOOT CLAMP COLUMN +-CYLINDER 山和後器电 ■GAUGING ◆一HOLE EPLATE HYDROSTATIC FLUID DIAPHRAGM BRIDGE RING5.2 Basic Methods of Force Measurement 4. Transducing the force to a fluid pressure and then measuring the pressure. ¾ Hydrostatic (流体静力学) cells: hydraulic cell is completely filled with oil and usually have a preload pressure of the order of 30 lb/in2. ¾ Application of load increases the oil pressure which is read on an accurate gage. ¾ Electrical pressure transducer can be used to obtain an electrical signal. ¾ The cells are very stiff. 13/50 5.2 Basic Methods of Force Measurement 4. Transducing the force to a fluid pressure and then measuring the pressure. ¾ The figure illustrates the Emery Winslow Model 136 - 75,000 lb. load cell used in truck scale applications. This hydrostatic cell type is also used in high capacity tank weighing, floor scales and custom applications http://emerywinslow.com/article_whosusing.html 14/50