SONAR SYSTEM UNSNARLS KINKS IN MIXING CEMENT AT THE PLANT

A CEMENT-MIXING PLANT HAS INSTALLED AN AUTOMATIC, ULTRASONIC MEASURING SYSTEM TO SOLVE A MEASUREMENT PROBLEM CREATED BY EFFECTS OF WEATHER EXTREMES. HEAT AND COLD, RAIN AND SNOW AGGRAVATED THE CAKING OF MATERIALS ON PADDLE WHEELS USED TO CHECK MATERIAL LEVELS IN THE CONCRETE-BATCH- MIXING FACILITY. THE ULTRASONIC MEASURING SYSTEM'S SOLID- STATE ELECTRONIC EQUIPMENT IS PACKAGED SO IT IS UNAFFECTED BY MOISTURE AND TEMPERATURE CHANGE. THIS ELIMINATES THE PROBLEM OF CAKING AND THE CATWALK CLIMB IS NO LONGER NEEDED BECAUSE THE NECESSARY PERIODIC INVENTORY READINGS OF MATERIAL LEVEL ARE NOW TAKEN AT THE CONTROL ROOM ON THE GROUND. THE SYSTEM CONSISTS OF A TRANSDUCER AND A SOLID- STATE ELECTRONICS UNIT CONNECTED BY COAXIAL CABLE. THE TRANSDUCER IS MOUNTED ABOVE THE MATERIAL TO BE MEASURED AND THE ELECTRONICS CONTROL UNIT WITH A READ-OUT METER IS IN A CONTROL ROOM. THE TRANSDUCER PROJECTS AN ULTRASONIC SIGNAL AND RECEIVES AN ECHO FROM THE TOP OF THE MATERIALS. A PRECISE TIMING CIRCUIT MEASURES THE TIME IT TAKES THE SIGNAL TO TRAVEL FROM THE SENSOR AND BACK. THIS TIME VALUE IS CONVERTED INTO VOLTAGE DISPLAYED ON A METER IN UNITS OF SPECIFIC APPLICATION. THE SYSTEM INCLUDES SIX TRANSDUCER HEADS WITH A MANUAL SELECTOR SWITCH THAT ALLOWS THE OPERATOR TO SELECT ANY OF SIX BINS FOR A LEVEL READING. THE LEVEL MONITOR SAMPLES EACH BIN TO DETERMINE WHICH IS FULL AND WHICH NEEDS ADDITIONAL INGREDIENTS. COMPLETE CONTROL OF EMPTYING AND REFILLING THE BINS CAN BE MAINTAINED FROM THE CONTROL ROOM.

  • Supplemental Notes:
    • Vol 40, No 5, P 118, 1 FIG
  • Publication Date: 1969-3-10

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  • Accession Number: 00215178
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 26 1994 12:00AM