Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
  • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
  • G01L5/042—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands by measuring vibrational characteristics of the flexible member
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D29/00—Producing belts or bands
  • B29D29/06—Conveyor belts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2021/00—Use of unspecified rubbers as moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
  • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
  • B29K2105/10—Cords, strands or rovings, e.g. oriented cords, strands or rovings
  • B29K2105/101—Oriented
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
  • B29K2705/08—Transition metals
  • B29K2705/12—Iron

Definitions

• This invention provides a method of making a steel cable reinforced conveyor belt while monitoring the tension of each of the cables going into the construction.
• T 4L 2 F 2 M
• T tension
• L the length between the two fixed points
• F the natural frequency of vibration
• M the mass per unit of length of the cable.
• a method of making a steel cable reinforced conveyor belt comprising the steps of encapsulating a plurality of steel cables between two layers of rubber while monitoring the tensions of all the cables by exciting a known length of each cable between a pair of clamps and measuring their natural frequencies by means of a combination of a permanent magnet and a linear Hall effect sensor in close proximity to each of the cables, sending the output signals from the sensors to a signal converter to convert the signal from analog to digital then to a digital signal processor to generate a signal for the period of each cable and sending the period data to a host computer to calculate the tension of each cable. The data from the last computer can then be fed back to adjust the tension of each cable.
• the excitation of the cables is brought about by moving the cables away from their rest position and then allowing them to vibrate.
• the sensors sense the changes in the magnetic flux and their output signals vary as the positions of the cables change.
• the periods of the sensors' outputs are detected and converted from analog to digital by means of a comparator circuit.
• Sets of thirty-two digital signals are read in parallel by a digital signal processor (DSP) at a regular rate prescribed by an internal DSP timer and interrupt.
• a time counter is incremented by one with each interrupt.
• a time stamp (value of the counter) is saved in the DSP memory for each channel each time the digital signal for that channel transitions low to high. Time stamps are collected in the DSP memory under interrupts long enough for at least one cable cycle to be detected. The time stamps are converted to periods.
• the integer period values are sent to the host computer.
• the host knows the time interval for each time counter increment so that the period in seconds can be determined and the tensions are then calculated.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Force Measurement Appropriate To Specific Purposes (AREA)

Priority Applications (9)

Applications Claiming Priority (1)

Publications (1)

Family

ID=22266308

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (1)

Citations (5)

• 1998
  • 1998-02-03 CA CA002315658A patent/CA2315658A1/en not_active Abandoned
  • 1998-02-03 DE DE69811541T patent/DE69811541T2/de not_active Expired - Fee Related
  • 1998-02-03 WO PCT/US1998/001932 patent/WO1999039898A1/en not_active Ceased
  • 1998-02-03 AU AU62610/98A patent/AU6261098A/en not_active Abandoned
  • 1998-02-03 EP EP98904824A patent/EP1060071B1/en not_active Expired - Lifetime
  • 1998-02-03 JP JP2000530362A patent/JP2002502724A/ja not_active Withdrawn
• 1999
  • 1999-01-21 ZA ZA9900451A patent/ZA99451B/xx unknown

Patent Citations (5)

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