CN211373485U - High-precision magnetic cold-tightening bolt elongation measuring instrument - Google Patents
High-precision magnetic cold-tightening bolt elongation measuring instrument Download PDFInfo
- Publication number
- CN211373485U CN211373485U CN202020265790.7U CN202020265790U CN211373485U CN 211373485 U CN211373485 U CN 211373485U CN 202020265790 U CN202020265790 U CN 202020265790U CN 211373485 U CN211373485 U CN 211373485U
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- bolt
- measuring instrument
- sleeve
- cold
- tightening bolt
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Abstract
The utility model discloses a high-precision magnetic cold-tightening bolt elongation measuring instrument, which comprises a measuring instrument and a cold-tightening bolt, wherein the measuring instrument comprises a digital display dial gauge and an upper sleeve, the right side surface of the upper sleeve is in threaded connection with a jackscrew, and the inner wall of the bottom end of the upper sleeve is in threaded connection with a lower magnetic sleeve; the cold-tightening bolt comprises a bolt and a nut; and a bolt measuring rod is arranged in the bolt. The high-precision magnetic cold-tightening bolt elongation measuring instrument uses a digital display dial gauge and a jackscrew, is convenient and quick to install and accurate in reading; the upper sleeve is made of high-strength aluminum alloy, so that the overall weight of the measuring instrument is greatly reduced, and the stability of the measuring instrument is improved; the lower magnetic sleeve made of the neodymium iron boron strong magnet is used, so that the measuring instrument can be adsorbed on the bolt in any direction, the measuring instrument is prevented from shaking, the stability of the measuring instrument is further improved, the measuring precision is improved, the labor intensity of work is reduced, and the installation time is saved.
Description
Technical Field
The utility model relates to a construction measuring tool of thermoelectricity trade specifically is cold tight bolt elongation measuring instrument of high accuracy magnetism.
Background
The extension amounts of the cylinder flange cold-tightening bolt, the steam guide pipe flange cold-tightening bolt and the bearing bush and bush pillow cold-tightening bolt on the steam turbine set play a critical role in normal work of the steam turbine set, the extension amounts of the cold-tightening bolts meet requirements, the tightening force of the bolts can reach the design standard, the defects that steam leaks from the cylinder or the steam guide pipe flange joint surface during the running of the steam turbine set, the bearing bush vibration exceeds the standard and the like are effectively avoided, and the normal running requirements of the steam turbine set are met.
The cold tight bolt elongation measuring apparatu who designs of steam turbine unit manufacturing plant at present measures the principle: a measuring rod is arranged in the bolt central hole, and the top end surface of the measuring rod is flush with and in clearance fit with the top end surface of the bolt; the end surface of the bottom of the measuring rod is flush with the end surface of the bottom of the bolt in interference fit. When the bolt is cold-tightened, the elongation measuring instrument is placed at the top of the bolt, and when the bolt is fastened, the measuring rod does not extend due to the extension of the bolt, so that the relative distance difference between the top of the bolt and the measuring rod can be measured, namely the elongation of the bolt. Problems with the use of an elongation meter:
(1) the measuring instrument uses a mechanical dial indicator, and the zero position needs to be adjusted for many times during installation, so that the operation is complicated.
(2) The measuring apparatu is cylindrical steel, and the upper portion sleeve is big than lower part sleeve diameter, and the focus leans on last, and when the measuring apparatu was placed at the perpendicular bolt that upwards fastens, the measuring apparatu had the not enough problem of stability, emptys easily and causes the inaccurate reading of bolt elongation.
(3) When the measuring instrument is used for measuring bolts fastened horizontally and vertically downwards, the measuring instrument must be held by hands, and the operation is very laborious.
Therefore, we propose a high-precision magnetic cold-tightening bolt elongation measuring instrument.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high accuracy magnetism cold tightening bolt elongation measuring apparatu to solve the problem that provides among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: the high-precision magnetic cold-tightening bolt elongation measuring instrument comprises a measuring instrument and a cold-tightening bolt, wherein the measuring instrument comprises a digital display dial indicator and an upper sleeve, the right side surface of the upper sleeve is in threaded connection with a jackscrew, and the inner wall of the bottom end of the upper sleeve is in threaded connection with a lower magnetic sleeve; the cold-tightening bolt comprises a bolt and a nut; and a bolt measuring rod is arranged in the bolt.
Preferably, a meter rod of the digital display dial indicator downwards penetrates through the upper sleeve and the lower magnetic sleeve to be lapped with the bolt measuring rod.
Preferably, the material of lower part magnetism sleeve is neodymium iron boron strong magnet, the upper surface magnetic force of lower part magnetism sleeve and bolt adsorbs.
Preferably, the upper sleeve is made of high-strength aluminum alloy, and the lower surface of the upper sleeve is provided with a thread mounting groove matched with the lower magnetic sleeve.
Advantageous effects
The utility model provides a cold tight bolt elongation measuring apparatu of high accuracy magnetism possesses following beneficial effect:
1. the high-precision magnetic cold-tightening bolt elongation measuring instrument uses a digital display dial gauge and a jackscrew, is convenient and quick to install and accurate in reading; the upper sleeve is made of high-strength aluminum alloy, so that the overall weight of the measuring instrument is greatly reduced, and the stability of the measuring instrument is improved.
2. This cold tight bolt elongation measuring apparatu of high accuracy magnetism uses the lower part magnetism sleeve of neodymium iron boron strong magnet material for the measuring apparatu can adsorb on the bolt of arbitrary direction, has avoided the measuring apparatu to rock, has further improved measuring apparatu stability, improves measurement accuracy, has alleviateed work intensity of labour, has practiced thrift installation time.
Drawings
Fig. 1 is a schematic view of the utility model.
In the figure: 1 digital display dial indicator, 2 jackscrews, 3 upper sleeves, 4 lower magnetic sleeves, 5 bolt measuring rods, 6 bolts and 7 nuts.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: high accuracy magnetism cold-tightening bolt elongation measuring apparatu, including measuring apparatu and cold-tightening bolt, the measuring apparatu includes digital display percentage table 1 and upper portion sleeve 3, and the right side surface threaded connection of upper portion sleeve 3 has jackscrew 2, and the bottom inner wall threaded connection of upper portion sleeve 3 has the material of lower part magnetism sleeve 4 upper portion sleeve 3 to be the high-strength aluminum alloy, and the lower surface of upper portion sleeve 3 is seted up the screw thread mounting groove with 4 adaptations of lower part magnetism sleeve.
The cold-tightening bolt comprises a bolt 6 and a nut 7; bolt measuring stick 5 has been placed to the inside of bolt 6, and digital display percentage table 1's gauge stick passes upper portion sleeve 3 and lower part magnetism sleeve 4 and 5 overlap joints of bolt measuring stick downwards, and lower part magnetism sleeve 4's material is neodymium iron boron strong magnet, and lower part magnetism sleeve 4 adsorbs with the upper surface magnetic force of bolt 6.
The working principle is as follows: when the measuring instrument is used for measuring the elongation of the cold-tightened bolt, the upper sleeve 3 and the lower sleeve 4 are connected through threads and screwed, then a switch is pressed to start the digital display dial indicator, the digital display dial indicator 1 is inserted into the upper sleeve 3 and the lower magnetic sleeve 4, an indicator rod extends out of the lower sleeve by about 5mm, and a jackscrew 2 is screwed to lock the digital display dial indicator 1; the whole measuring instrument is placed in the center of the end face of the cold-tightening bolt, so that the rod of the digital display dial indicator 1 of the measuring instrument is contacted with the measuring rod 5 of the bolt, the magnetic sleeve 4 at the lower part of the measuring instrument has magnetism, the measuring instrument is automatically adsorbed on the bolt 6 by magnetic force, the zero button of the digital display dial indicator 1 is pressed again, the reading of the measuring instrument is reset to zero, and the installation work of the measuring instrument is finished; during measurement, the manual hollow wrench or the hydraulic hollow wrench is operated to tighten the bolt 6, the reading of the measuring instrument digital display dial indicator 1 is observed until the elongation of the bolt 6 meets the design standard, the measuring instrument is taken down after the cold tightening bolt is installed, and the manual hollow wrench or the hydraulic hollow wrench is taken down.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. High accuracy magnetism cold-tightening bolt elongation measuring apparatu, including measuring apparatu and cold-tightening bolt, its characterized in that: the measuring instrument comprises a digital display dial indicator (1) and an upper sleeve (3), wherein the right side surface of the upper sleeve (3) is in threaded connection with a jackscrew (2), and the inner wall of the bottom end of the upper sleeve (3) is in threaded connection with a lower magnetic sleeve (4); the cold-tightening bolt comprises a bolt (6) and a nut (7); and a bolt measuring rod (5) is arranged in the bolt (6).
2. The high-precision magnetic cold-tightening bolt elongation measuring instrument according to claim 1, wherein: and a gauge rod of the digital display dial indicator (1) downwards penetrates through the upper sleeve (3) and the lower magnetic sleeve (4) to be lapped with the bolt measuring rod (5).
3. The high-precision magnetic cold-tightening bolt elongation measuring instrument according to claim 1, wherein: the material of lower part magnetism sleeve (4) is neodymium iron boron strong magnet, the upper surface magnetic force of lower part magnetism sleeve (4) and bolt (6) adsorbs.
4. The high-precision magnetic cold-tightening bolt elongation measuring instrument according to claim 1, wherein: the material of upper portion sleeve (3) is high-strength aluminum alloy, the screw thread mounting groove with lower part magnetic sleeve (4) adaptation is seted up to the lower surface of upper portion sleeve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020265790.7U CN211373485U (en) | 2020-03-06 | 2020-03-06 | High-precision magnetic cold-tightening bolt elongation measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020265790.7U CN211373485U (en) | 2020-03-06 | 2020-03-06 | High-precision magnetic cold-tightening bolt elongation measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211373485U true CN211373485U (en) | 2020-08-28 |
Family
ID=72154050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020265790.7U Expired - Fee Related CN211373485U (en) | 2020-03-06 | 2020-03-06 | High-precision magnetic cold-tightening bolt elongation measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211373485U (en) |
-
2020
- 2020-03-06 CN CN202020265790.7U patent/CN211373485U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200828 |
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| CF01 | Termination of patent right due to non-payment of annual fee |