GB2469019A - Bolt pre-load monitor using eddy current displacement sensor - Google Patents

Bolt pre-load monitor using eddy current displacement sensor Download PDF

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Publication number
GB2469019A
GB2469019A GB0905311A GB0905311A GB2469019A GB 2469019 A GB2469019 A GB 2469019A GB 0905311 A GB0905311 A GB 0905311A GB 0905311 A GB0905311 A GB 0905311A GB 2469019 A GB2469019 A GB 2469019A
Authority
GB
United Kingdom
Prior art keywords
bolt
eddy current
load
displacement sensor
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0905311A
Other versions
GB0905311D0 (en
Inventor
Ronald Scott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0905311A priority Critical patent/GB2469019A/en
Publication of GB0905311D0 publication Critical patent/GB0905311D0/en
Publication of GB2469019A publication Critical patent/GB2469019A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
    • F16B31/025—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load with a gauge pin in a longitudinal bore in the body of the bolt
    • 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
    • G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
    • F16B2031/022—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load using an ultrasonic transducer

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

A bolt pre-load monitor includes an eddy current based relative displacement sensor to sense the movement of a pin 6 placed in the head of a bolt, thereby monitoring extension of the bolt shank 8 when tension is applied thereto. The eddy current sensor consists of a printed circuit board 1 on one side of which is mounted a coil 2 which faces a copper or aluminium disc 4 attached to the top of the pin. The other side of the circuit board is used to mount the electronics for the eddy current sensor. The monitor allows the quantitative measurement of pre-load applied to the bolt during installation thereof as well as allowing subsequent monitoring and/or checking of the in-service load on the bolt.

Description

Description
The present invention relates to the use of an eddy current measurement device to detect and monitor or to check the pre-load on a torqued bolt in a mechanical installation. The eddy current probe is used to sense the movement of a machined pin (6), placed in the head of the bolt. Movement of the pin indicates the bolt shank extension. The eddy current probe consists of a PCB mounted coil (2) facing a copper or aluminium disc (4) attached to the pin top. The other side of the PCB is used to mount the electronics for the eddy current probe. The device is shown in Figure 1. The pin is forced into position against the body of the bolt by a compression spring (7). Movement in the body of the bolt caused by a change in load causes the pin to move.
This causes the eddy current probe signal output to alter as the distance between the pin head and the eddy current detector changes. This signal output is detected by a measurement and data logging device and the change in frequency is related to a change in bolt load via a software algorithm.

Claims (5)

  1. Claims 1. A low cost device to allow the quantitative measurement of the pre-load applied to a bolt during installation.
  2. 2. A low cost device that allows the subsequent monitoring and or checking the pre-load of a bolt in service.
  3. 3. A device that allows the "in service" bolt load to be monitored.
  4. 4. The use of a low cost eddy current sensor located inside of the head of the bolt to measure bolt pre-load by measuring relative displacement.
  5. 5. The use of a coil etched onto a PCB together with the electronic components for the eddy current probe.
GB0905311A 2009-03-30 2009-03-30 Bolt pre-load monitor using eddy current displacement sensor Withdrawn GB2469019A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0905311A GB2469019A (en) 2009-03-30 2009-03-30 Bolt pre-load monitor using eddy current displacement sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0905311A GB2469019A (en) 2009-03-30 2009-03-30 Bolt pre-load monitor using eddy current displacement sensor

Publications (2)

Publication Number Publication Date
GB0905311D0 GB0905311D0 (en) 2009-05-13
GB2469019A true GB2469019A (en) 2010-10-06

Family

ID=40671838

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0905311A Withdrawn GB2469019A (en) 2009-03-30 2009-03-30 Bolt pre-load monitor using eddy current displacement sensor

Country Status (1)

Country Link
GB (1) GB2469019A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021536584A (en) * 2018-08-29 2021-12-27 ブリン、ヨルクBLIN Joerg Fixing means
WO2023052467A1 (en) * 2021-09-28 2023-04-06 Krabo Srl Method, apparatus, and system for a fastener having a wireless monitoring system

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718066A (en) * 1970-12-28 1973-02-27 Iit Res Inst Tension indicating fastener
US4294122A (en) * 1979-07-12 1981-10-13 General Dynamics Corporation Fastener incorporating ultrasonic transducer
US5461923A (en) * 1994-05-16 1995-10-31 Raymond Engineering Inc. Acoustic transducer, transducerized fastener and method of manufacture
WO1999009327A1 (en) * 1997-08-19 1999-02-25 Ceney, Patricia, Anne Load indicating fastener systems method and apparatus
US5945665A (en) * 1997-05-09 1999-08-31 Cidra Corporation Bolt, stud or fastener having an embedded fiber optic Bragg Grating sensor for sensing tensioning strain
WO2000022306A1 (en) * 1998-10-09 2000-04-20 Hanstock Fasteners Pty. Ltd. Monitoring tension of threaded fasteners
GB2372826A (en) * 2001-03-01 2002-09-04 Rotabolt Ltd Load-indicating fastener
US20030011275A1 (en) * 2001-07-13 2003-01-16 Masoud Nasrollahzadeh Ultra-sonic transducer assembly incorporated into a printed circuit board for determining tension forces in a bolt
WO2003021115A1 (en) * 2001-09-03 2003-03-13 Sjb Engineering Ltd Load-indicating fastener
US20060225484A1 (en) * 2001-10-09 2006-10-12 Gleman Stuart M Bolt tension gauging system
US20060263166A1 (en) * 2005-05-18 2006-11-23 Honeywell International Inc. Devices and methods for monitoring fastener tension
US20070017295A1 (en) * 2005-07-19 2007-01-25 Hiroyuki Ohta Bolt with function of measuring strain

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718066A (en) * 1970-12-28 1973-02-27 Iit Res Inst Tension indicating fastener
US4294122A (en) * 1979-07-12 1981-10-13 General Dynamics Corporation Fastener incorporating ultrasonic transducer
US5461923A (en) * 1994-05-16 1995-10-31 Raymond Engineering Inc. Acoustic transducer, transducerized fastener and method of manufacture
US5945665A (en) * 1997-05-09 1999-08-31 Cidra Corporation Bolt, stud or fastener having an embedded fiber optic Bragg Grating sensor for sensing tensioning strain
WO1999009327A1 (en) * 1997-08-19 1999-02-25 Ceney, Patricia, Anne Load indicating fastener systems method and apparatus
WO2000022306A1 (en) * 1998-10-09 2000-04-20 Hanstock Fasteners Pty. Ltd. Monitoring tension of threaded fasteners
GB2372826A (en) * 2001-03-01 2002-09-04 Rotabolt Ltd Load-indicating fastener
US20030011275A1 (en) * 2001-07-13 2003-01-16 Masoud Nasrollahzadeh Ultra-sonic transducer assembly incorporated into a printed circuit board for determining tension forces in a bolt
WO2003021115A1 (en) * 2001-09-03 2003-03-13 Sjb Engineering Ltd Load-indicating fastener
US20060225484A1 (en) * 2001-10-09 2006-10-12 Gleman Stuart M Bolt tension gauging system
US20060263166A1 (en) * 2005-05-18 2006-11-23 Honeywell International Inc. Devices and methods for monitoring fastener tension
US20070017295A1 (en) * 2005-07-19 2007-01-25 Hiroyuki Ohta Bolt with function of measuring strain

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021536584A (en) * 2018-08-29 2021-12-27 ブリン、ヨルクBLIN Joerg Fixing means
JP7077489B2 (en) 2018-08-29 2022-05-30 ブリン、ヨルク Fixing means
WO2023052467A1 (en) * 2021-09-28 2023-04-06 Krabo Srl Method, apparatus, and system for a fastener having a wireless monitoring system

Also Published As

Publication number Publication date
GB0905311D0 (en) 2009-05-13

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)