NEW WEAPON IN ATTACK ON MARGINAL AGGREGATES

THE NEW MACHINE CONSISTS OF A HORIZONTAL CIRCULAR PLATE WHICH SUPPORTS A BED OF MATERIAL ON WHICH CRUSHING AND KNEADING FORCES ARE APPLIED BY SIX SETS OF WHEELS OR ROLLERS. THE CRUSHING ACTION PULVERIZES PARTICLES OF FRIABLE SANDSTONE, BONY COAL, CLAY BALLS, SHALE AND BRITTLE NODULES WHILE AT THE SAME TIME THE KNEADING ACTION SCOURS OFF COATINGS OF CLAY OR ORGANIC SHINES TO POLISH THE SOUND GRAVELS. THE MACHINE MAY BE COMBINED WITH ONE OR MORE PIECES OF EQUIPMENT THAT HAVE BEEN SELECTED AFTER ANALYSIS OF A PARTICULAR PROBLEM. THE VOLUME OF ONE OR MORE UNDESIRABLE CONTAMINANTS PRESENT IN A PARTICULAR DEPOSIT CAN BE REDUCED ON A SELECTIVE BASIS BY ADJUSTMENTS OR MODIFICATIONS WHICH MAY BE MADE AT A NUMBER OF POINTS. THE PROTOTYPE MACHINE HAS A 12 FT DIAMETER BED WITH ADJUSTABLE SIDE PLATES THAT MAINTAIN A BED OF GRAVEL BETWEEN 2 AND 4 IN. DEEP. THIS SUPPORTS A ROTATING FRAME OF SIX SETS OF PNEUMATIC TIRE ASSEMBLIES, EACH WITH FOUR 8:25 BY 15 TIRES PER SHAFT. THE TIRES ARE STAGGERED ON THE SHAFT TO AVOID TRACKING AND TO MAXIMIZE CONTACT BETWEEN THE TIRES AND THE AGGREGATES. EACH ASSEMBLY MAY BE SO ANGLED AS TO ACCELERATE OR RETARD MOVEMENT OF GRAVEL ACROSS THE TABLE. THE EFFECTIVITY OF THE 15,000 LB MACHINE MAY BE INCREASED BY ADDITION OF LARGER MOTORS. EACH SHAFT WAS EQUIPPED WITH A 7.5 HP MOTOR AND BELT DRIVEN VARIABLE SPEED DRIVE TO GIVE ROTATION SPEED BETWEEN 10 AND 25 RPM. THE ROTATING ASSEMBLIES ARE EQUIPPED WITH SPRAY BARS TO APPLY BETWEEN 100 TO 300 GPM OF WATER. AGGREGATES ARE CHUTED DOWN FROM A SUPPLY BIN INTO A CIRCULAR DISTRIBUTION HOPPER AT THE AXIS OF THE MACHINE. TWO SIZES OF MACHINES ARE BEING MANUFACTURED FOR DISTRIBUTION AS FULL SCALE PRODUCTION UNITS. THE EFFECTIVITY OF THE EQUIPMENT ON GRAVELS FROM DIFFERENT PARTS OF THE COUNTRY IS STILL TO BE TESTED. THE NEED FOR TESTING A LARGE SAMPLE BEFORE RECOMMENDATION OF A PRODUCTION MACHINE FOR SOLVING A PARTICULAR AGGREGATES PROBLEM IS EMPHASIZED.

• Publication Date: 1972-7

Media Info

• Features: Photos;
• Pagination: p. 27-8
• Serial:
  • Roads and Streets
  • Volume: 115
  • Issue Number: 7
  • Publisher: Donnelley (Reuben H) Corporation

Subject/Index Terms

• TRT Terms: Aggregates; Crushing; Equipment; Gravel; Machines
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00217331
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 9 1973 12:00AM