JPS5619423A - Bolt axial force detector - Google Patents
Bolt axial force detectorInfo
- Publication number
- JPS5619423A JPS5619423A JP9593879A JP9593879A JPS5619423A JP S5619423 A JPS5619423 A JP S5619423A JP 9593879 A JP9593879 A JP 9593879A JP 9593879 A JP9593879 A JP 9593879A JP S5619423 A JPS5619423 A JP S5619423A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- bolt
- detection coil
- head
- field
- 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.)
- Pending
Links
Abstract
PURPOSE: To improve the detection precision for the tightening stress of a bolt by providing a magnetic-field detecting element, which detects a magnetic field in parallel to the surface of the head of the bolt, on the surface of the bolt head and by increasing variation in magnetic flux by the output of the magnetic-field detecting element.
CONSTITUTION: As constituent elements of a magnetic sensor, magnetic core 4, exciting coil 5, detection coil 6 and magnetic-field detection coil 7 are adjacently provided on the surface of the head of bolt 1. Then, AC electric power source 8 is so controlled that once exciting coil 5 is excited by AC electric power source 8, voltage detector 9 obtains a constant voltage from detection coil 6. Magnetic-field detection coil 7, on the other hand, detects magnetizing force on the surface of the head of bolt 1. Therefore, as bolt tightening stress operates and magnetic characteristics of bolt 1 vary, the output voltage of detection coil 6 and that of magnetic-field detection coil 7 are multiplied by each other at multiplier 12, whose output voltage appears at a variation rate large for variation in magnetic characteristic. Measuring this by indicator 13 can detect bolt axial force with high precision.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9593879A JPS5619423A (en) | 1979-07-27 | 1979-07-27 | Bolt axial force detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9593879A JPS5619423A (en) | 1979-07-27 | 1979-07-27 | Bolt axial force detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5619423A true JPS5619423A (en) | 1981-02-24 |
Family
ID=14151199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9593879A Pending JPS5619423A (en) | 1979-07-27 | 1979-07-27 | Bolt axial force detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5619423A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002048659A (en) * | 2000-08-01 | 2002-02-15 | Azuma Systems:Kk | Method and device for diagnosing stress in ground anchor |
| JP2011220713A (en) * | 2010-04-05 | 2011-11-04 | Sensor System Co Ltd | Bolt tightening force test equipment |
| WO2011154446A1 (en) * | 2010-06-08 | 2011-12-15 | Rocan System Ab | Device and method for indicating if a fastening element has reached a tensile yield limit load. |
-
1979
- 1979-07-27 JP JP9593879A patent/JPS5619423A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002048659A (en) * | 2000-08-01 | 2002-02-15 | Azuma Systems:Kk | Method and device for diagnosing stress in ground anchor |
| JP2011220713A (en) * | 2010-04-05 | 2011-11-04 | Sensor System Co Ltd | Bolt tightening force test equipment |
| WO2011154446A1 (en) * | 2010-06-08 | 2011-12-15 | Rocan System Ab | Device and method for indicating if a fastening element has reached a tensile yield limit load. |
| JP2013536088A (en) * | 2010-06-08 | 2013-09-19 | ロカン システム アクチエボラグ | Apparatus and method for indicating whether a fastening element has reached a tensile yield limit load |
| US8910526B2 (en) | 2010-06-08 | 2014-12-16 | Rocan System Ab | Device and method for indicating if a fastening element has reached a tensile yield limit load |
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