JPS55134331A - Fastening load detector for bolt - Google Patents

Fastening load detector for bolt

Info

Publication number
JPS55134331A
JPS55134331A JP4101079A JP4101079A JPS55134331A JP S55134331 A JPS55134331 A JP S55134331A JP 4101079 A JP4101079 A JP 4101079A JP 4101079 A JP4101079 A JP 4101079A JP S55134331 A JPS55134331 A JP S55134331A
Authority
JP
Japan
Prior art keywords
bolt
magnetic sensor
iron loss
head
coil
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.)
Granted
Application number
JP4101079A
Other languages
Japanese (ja)
Other versions
JPS5945929B2 (en
Inventor
Yoshikazu Takekoshi
Takeshi Yagisawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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
Priority to GB7918913A priority Critical patent/GB2022268B/en
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP4101079A priority patent/JPS5945929B2/en
Priority to US06/041,884 priority patent/US4279163A/en
Priority to DE2922256A priority patent/DE2922256C2/en
Priority to CH515979A priority patent/CH640054A5/en
Priority to CA000328957A priority patent/CA1117596A/en
Priority to SE7904806A priority patent/SE437886B/en
Publication of JPS55134331A publication Critical patent/JPS55134331A/en
Publication of JPS5945929B2 publication Critical patent/JPS5945929B2/en
Expired legal-status Critical Current

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  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

PURPOSE: To detect the fastening load of a bolt precisely and simply and to know a secular change of the bolt tightness easily by measuring iron loss by providing a magnetic sensor on the head of bolt that is used in a constructed structure.
CONSTITUTION: A magnetic sensor 14 is placed on the head of a clamping bolt 12 that is provided to the structure 11a, 11b. In the magnetic sensor 14, an exciter coil 15a and an output secondary coil 15b are wound around an iron core 13. Also the coil 15b is connected to both the voltage terminal of a wattmeter 17 and a volt meter 18, the wattmeter 17 is connected to the load indicator 19 which has an arithmetic circuit that obtains a change of the iron loss as a change rate of the iron loss and converts it into the fastening load. When the exciter coil 15a is excited by AC, the magnetic flux flows on the surface of the bolt head and returns to the magnetic sensor 14 because of the skin effect. In this way, the flow of magnetic flux on the bolt head is made correspond to the direction of compressive force, the axial load of the bolt is detected from the iron loss characteristic obtained by the magnetic sensor in such a state.
COPYRIGHT: (C)1980,JPO&Japio
JP4101079A 1978-06-02 1979-04-06 Bolt tightening load detection device Expired JPS5945929B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB7918913A GB2022268B (en) 1978-06-02 1979-03-31 Stress measuring apparatus
JP4101079A JPS5945929B2 (en) 1979-04-06 1979-04-06 Bolt tightening load detection device
US06/041,884 US4279163A (en) 1978-06-02 1979-05-23 Stress measuring apparatus
DE2922256A DE2922256C2 (en) 1978-06-02 1979-05-31 Device for measuring mechanical tension
CH515979A CH640054A5 (en) 1978-06-02 1979-06-01 Device for measuring of mechanical tensions and use thereof.
CA000328957A CA1117596A (en) 1978-06-02 1979-06-01 Stress measuring apparatus
SE7904806A SE437886B (en) 1978-06-02 1979-06-01 Apparatus for saturation of a mechanical voltage in a ferromagnetic form

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4101079A JPS5945929B2 (en) 1979-04-06 1979-04-06 Bolt tightening load detection device

Publications (2)

Publication Number Publication Date
JPS55134331A true JPS55134331A (en) 1980-10-20
JPS5945929B2 JPS5945929B2 (en) 1984-11-09

Family

ID=12596415

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4101079A Expired JPS5945929B2 (en) 1978-06-02 1979-04-06 Bolt tightening load detection device

Country Status (1)

Country Link
JP (1) JPS5945929B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57161526A (en) * 1981-03-31 1982-10-05 Shibaura Eng Works Co Ltd Measuring method for axial tension of bolt
US5499540A (en) * 1994-02-15 1996-03-19 The Babcock & Wilcox Company Electromagnetic acoustic transducer for bolt tension and load measurement
US5675087A (en) * 1994-02-15 1997-10-07 The Babcock & Wilcox Company Fastener characterization with an electromagnetic acoustic transducer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57161526A (en) * 1981-03-31 1982-10-05 Shibaura Eng Works Co Ltd Measuring method for axial tension of bolt
JPH0318137B2 (en) * 1981-03-31 1991-03-11 Shibaura Eng Works Ltd
US5499540A (en) * 1994-02-15 1996-03-19 The Babcock & Wilcox Company Electromagnetic acoustic transducer for bolt tension and load measurement
US5675087A (en) * 1994-02-15 1997-10-07 The Babcock & Wilcox Company Fastener characterization with an electromagnetic acoustic transducer

Also Published As

Publication number Publication date
JPS5945929B2 (en) 1984-11-09

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