CN217005600U - Hydroelectric set runner shaft coupling big bolt fastening elongation measuring tool - Google Patents
Hydroelectric set runner shaft coupling big bolt fastening elongation measuring tool Download PDFInfo
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- CN217005600U CN217005600U CN202220306663.6U CN202220306663U CN217005600U CN 217005600 U CN217005600 U CN 217005600U CN 202220306663 U CN202220306663 U CN 202220306663U CN 217005600 U CN217005600 U CN 217005600U
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- 238000010168 coupling process Methods 0.000 title claims abstract description 69
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 69
- 230000008878 coupling Effects 0.000 title claims abstract description 68
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model relates to a measuring tool for fastening elongation of a large bolt of a rotating wheel coupling of a hydroelectric generating set, which comprises a dial indicator (1), a measuring meter sleeve (2), a fastening screw (3) and a rigidity measuring rod (4); the dial indicator (1) is fixed on the measuring meter sleeve (2), and the measuring meter sleeve (2) is fixed at the end part of the coupling bolt (5) through a fastening screw (3); the rigidity measuring rod (4) comprises a measuring arm (41) and a connecting arm (42), one end of the measuring arm (41) is inserted into a central hole of the coupling bolt (5), the other end of the measuring arm is externally sleeved with a measuring meter sleeve (2) and is in contact with a measuring meter head of the dial indicator (1), and the connecting arm (42) is fixed at the end part of the coupling bolt (5) through a fastening screw (3). Compared with the prior art, the utility model can realize the accurate measurement of the stretching amount of the coupling bolt, has compact structure, reasonable design, high measurement precision and convenient operation, and has certain popularization and application values.
Description
Technical Field
The utility model relates to the technical field of measuring tools, in particular to a measuring tool for fastening elongation of a large bolt of a rotating wheel coupling of a hydroelectric generating set.
Background
In order to ensure the rigidity, reliability, sealing, looseness prevention, improvement of the fatigue strength of the bolts and other application requirements of the connecting structure, most of the bolts are required to be subjected to pre-tightening treatment in the installation process: namely, a certain pre-tightening stress is applied to the bolt during assembly, and a large number of tests and use experience prove that: higher pre-tightening force is beneficial to the reliability of connection and the service life of the connected part, and is particularly necessary for connection with sealing requirements; in order to prevent the bolt from being overloaded or insufficient in pre-tightening, the pre-tightening stress of the bolt needs to be accurately controlled.
In order to better control the fastening quality of the bolt, the elongation of the bolt is increasingly used as a standard for controlling the fastening of the bolt. Taking a Xieyin beach hydroelectric generating set as an example, the fastening mode of the coupling bolt comprises stretching, heating, hydraulic wrench fastening and the like, and compared with other modes, the method for measuring the elongation of the bolt is more accurate and reliable in the fastening of the bolt, so that the elongation of the bolt is mostly used as the fastening requirement. The bolt is provided with a central hole, and the measuring device can be inserted into the central hole to measure the elongation of the bolt.
Taking a xianyiban hydroelectric generating set as an example, in a general situation, when measuring the stretching amount of a large bolt, a dial indicator seat is sucked on a flange surface or other fixed surfaces, a measuring head of the dial indicator props against the bolt, then the dial indicator is adjusted, the reading of the dial indicator is recorded before stretching, the reading is recorded again after stretching, and the difference value of the two numerical values is the stretching value. However, the measurement method has certain errors, when the bolt is stretched by a stretcher, the bolt is stressed to extend, the screw threads of the screw hole are stressed to deform, and the difference value of two measurement values actually contains the deformation of the screw threads of the screw hole. Therefore, the measuring method cannot accurately measure the elongation of the coupling bolt. The conventional method cannot achieve the expected measurement of the pre-tightening force of the coupling bolt, so that the overall coupling bolt tightening force is unbalanced, and even the serious result of bolt damage is caused.
In order to ensure the fastening efficiency and quality of the coupling bolt, ensure that a plurality of bolts which are stretched and fastened for a plurality of times reach the balance of fastening force and ensure the fastening quality, the elongation of the bolts needs to be accurately measured, and therefore, a new bolt elongation measuring tool is necessary to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a measuring tool for the fastening elongation of a large bolt of a runner coupling of a hydroelectric generating set, which improves the measuring precision.
The purpose of the utility model can be realized by the following technical scheme: a hydroelectric generating set runner shaft coupling large bolt fastening elongation measuring tool comprises a dial indicator, a measuring meter sleeve, a fastening screw and a rigidity measuring rod;
the dial indicator is fixed on the measuring meter sleeve, and the measuring meter sleeve is fixed at the end part of the coupling bolt through a fastening screw;
the rigidity measuring rod comprises a measuring arm and a connecting arm, one end of the measuring arm is inserted into a central hole of the coupling bolt, the outer part of the other end of the measuring arm is sleeved with a measuring meter sleeve and is in contact with a measuring meter head of the dial indicator, and the connecting arm is fixed at the end part of the coupling bolt through a fastening screw.
Preferably, the top of the measuring meter sleeve is provided with a dial indicator insertion hole, the side edge of the measuring meter sleeve is provided with a stop threaded hole, a measuring meter head of the dial indicator extends into the measuring meter sleeve through the dial indicator insertion hole, and a stop screw transversely abuts against a measuring meter rod of the dial indicator through the stop threaded hole.
Preferably, the lower part of the sleeve of the measuring meter is provided with a fixed arm, the fixed arm is symmetrically provided with two through holes, and a fastening screw penetrates through the through holes and is fixed on the coupling bolt.
Further preferably, the connecting arm extends out of the sleeve of the measuring meter and is perpendicular to the fixing arm, two through holes are symmetrically formed in the connecting arm, and the fastening screw penetrates through the through holes and is fixed on the coupling bolt.
Still further preferably, the lower part of the sleeve of the measuring gauge is provided with a square hole for the connecting arm to pass through, and the height of the square hole is larger than the distance from the surface of the connecting arm to the surface of the coupling bolt.
Preferably, a gap is reserved between the connecting arm and the end face of the coupling bolt.
Further preferably, the distance between the connecting arm and the end face of the coupling bolt is 8-10 mm.
Preferably, the outer diameter of the measuring arm is smaller than the diameter of the central large hole of the sleeve of the measuring meter.
Further preferably, the outer diameter of the measuring arm is 2-3mm smaller than the diameter of the central large hole of the sleeve of the measuring gauge.
Preferably, the measuring arm is of a solid rod-shaped structure, and the outer diameter of the measuring arm is smaller than the diameter of a central hole of the coupling bolt.
Compared with the prior art, the utility model has the following advantages:
1. the rigidity measuring rod is arranged in the central hole of the coupling bolt, is relatively independent of the central hole, does not deform along with the stretching of the coupling bolt, ensures that the elongation of the measuring bolt meets the precision requirement, and has the advantages of simple and convenient operation, high detection precision and high reliability;
2. the rigidity measuring rod and the coupling bolt are kept relatively independent and do not deform along with the stretching of the coupling bolt, the distance between the end part of the rigidity measuring rod and the end part of the coupling bolt before and after the stretching of the coupling bolt is measured by comparing, the accurate measurement of the stretching amount of the coupling bolt can be realized, the structure is compact, the design is reasonable, the pre-tightening force of the coupling bolt is ensured to meet the requirement, the measuring precision is high, the operation is convenient, and the device has certain popularization and application values;
3. the device adopts detachable assembly, is convenient to install and adjust, is suitable for operation in narrow space, is flexible to operate, and reduces the workload;
4. the utility model can solve the problems of large measurement error of the coupling bolt on site and possible misoperation in the pre-tightening process.
Drawings
FIG. 1 is a schematic external view of a measuring tool according to the present invention;
FIG. 2 is an assembled cross-sectional view of the major components of the measuring tool of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a schematic view of a measuring tool according to the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4;
in the figure: 1-dial indicator, 2-measuring meter sleeve, 21-fixed arm, 3-fastening screw, 4-rigid measuring rod, 41-measuring arm, 42-connecting arm, 5-coupling bolt and 6-stop screw.
Detailed Description
The utility model is described in detail below with reference to the figures and the specific embodiments. The following examples are carried out on the premise of the technical scheme of the utility model, and detailed embodiments and specific operation processes are given, but the scope of the utility model is not limited to the following examples.
Example 1
The utility model provides a hydroelectric set runner shaft coupling large bolt fastening elongation measuring instrument, as shown in fig. 1 ~ 2, including percentage table 1, measuring meter sleeve 2, fastening screw 3 and rigidity measuring rod 4, measuring meter sleeve 2 passes through fastening screw 3 to be fixed at shaft coupling bolt 5 tip, be fixed with percentage table 1 at measuring meter sleeve 2 top, the vertical central macropore that inserts measuring meter sleeve 2 of the measuring gauge outfit of percentage table 1, as shown in fig. 3, rigidity measuring rod 4 is including inserting measuring arm 41 in the 5 downtheholes of shaft coupling bolt and fixing the linking arm 42 at shaft coupling bolt 5 tip through fastening screw 3. The outer side of the extending end of the measuring arm 41 is sleeved with a measuring meter sleeve 2, and a measuring meter head of a dial indicator 1 fixed on the measuring meter sleeve 2 is in contact measurement with the end face of the measuring arm 41.
Example 2
A hydroelectric set runner shaft coupling large bolt fastening elongation measuring tool comprises a measuring meter sleeve 2, a rigidity measuring rod 4, a stop screw 6, a dial indicator 1 and a fastening screw 3. The upper part of the measuring meter sleeve 2 is provided with a dial indicator insertion hole, so that a measuring meter head of the dial indicator 1 can conveniently extend into the measuring meter head to be in contact measurement with the end face of the head of the rigid measuring rod 4, the side edge of the measuring meter sleeve is provided with a stop threaded hole and is in threaded connection with a stop screw 6, the dial indicator 1 is prevented from loosening and sliding, and the stability and the measuring precision are improved; the lower part is provided with a square hole perpendicular to the arm direction, and the square hole is used for avoiding the arm (connecting arm 42) of the rigid measuring rod 4 during connection; inside it, there is a hole larger than the diameter of the measuring rod (measuring arm 41) to fit over the measuring rod. The rigid measuring rod 4 is of a solid rod-shaped structure, the upper part of the rigid measuring rod is provided with an arm (measuring arm 41), and the arm is symmetrically provided with two through holes for connecting and fixing with the coupling bolt 5 through a fastening screw 3; the rigidity measuring rod 4 is arranged in a center hole of the coupling bolt 5, the outside of the rigidity measuring rod is sleeved with the measuring meter sleeve 2, and the rigidity measuring rod and the measuring meter sleeve are respectively connected and fixed with a threaded hole in the end face of the coupling bolt 5 in a cross mode through screws.
The specific use process of the measuring tool in the embodiment is as follows:
(1) cleaning the central hole of the coupling bolt 5, and unhairing and cleaning the end part of the bolt.
(2) The runner coupling bolt is screwed down to be installed in place, a measuring tool is installed before stress, the rigid measuring rod 4 is installed firstly, and two M8 measuring rod fastening screws 3 are tightened to make position marks. Installing a sleeve 2 of the measuring meter, tightening two M8 sleeve fastening screws 3, making position marks, adjusting the reading of the dial indicator 1, tightening M5 dial indicator stop screws 6 when the small indicator is 5 and the large indicator is 0, and fixing a rotating disc of the dial indicator 1 (the locking bolt and the locking dial plate of the dial indicator cannot be touched).
(3) And disassembling the measuring tool, installing a special tool for fastening the rotating wheel coupling bolt, and tightening according to the required torque.
(4) And (3) disassembling the special fastening tool for the rotating wheel coupling bolt, installing the rigid measuring rod 4 again, and tightening two M8 measuring rod fastening screws 3. The dial gauge 1 reading (the mounting position coincides with the first mounting mark) is recorded by mounting the gauge sleeve 2 again, tightening the two M8 sleeve fastening screws 3.
(5) And finally, subtracting the first reading from the second reading to obtain the result, namely the elongation of the bolt.
Example 3
A large bolt fastening elongation measuring tool for a rotating wheel coupling of a hydroelectric generating set is characterized in that an arm (a connecting arm 42) at the upper part of a rigid measuring rod 4 is 8-10mm higher than the end face of a coupling bolt 5, and the rest of the structure is the same as that of the embodiment 2.
Example 4
The utility model provides a hydroelectric set runner shaft coupling large bolt fastening elongation measuring tool, 4 diameters of rigidity measuring stick in measuring meter sleeve 2 are less than 2-3mm of measuring meter sleeve 2 center macropore diameter, and the square hole height of measuring meter sleeve 2 lower part is greater than the distance on linking arm 42 surface to 5 surfaces of shaft coupling bolt, and all the other structures are the same with embodiment 3.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A large bolt fastening elongation measuring tool for a rotating wheel coupling of a hydroelectric generating set is characterized by comprising a dial indicator (1), a measuring meter sleeve (2), a fastening screw (3) and a rigid measuring rod (4);
the dial indicator (1) is fixed on the measuring meter sleeve (2), and the measuring meter sleeve (2) is fixed at the end part of the coupling bolt (5) through a fastening screw (3);
the rigidity measuring rod (4) comprises a measuring arm (41) and a connecting arm (42), one end of the measuring arm (41) is inserted into a central hole of the coupling bolt (5), the other end of the measuring arm is externally sleeved with a measuring meter sleeve (2) and is in contact with a measuring meter head of the dial indicator (1), and the connecting arm (42) is fixed at the end part of the coupling bolt (5) through a fastening screw (3).
2. The fastening elongation measuring tool for the large bolt of the runner coupling of the hydroelectric generating set according to claim 1 is characterized in that a dial indicator insertion hole is formed in the top of the measuring meter sleeve (2), a stop threaded hole is formed in the side of the measuring meter sleeve, a measuring meter head of the dial indicator (1) extends into the measuring meter sleeve (2) through the dial indicator insertion hole, and a stop screw (6) transversely abuts against a measuring meter rod of the dial indicator (1) through the stop threaded hole.
3. The fastening elongation measuring tool for the large bolt of the wheel coupling of the hydroelectric generating set according to claim 1, characterized in that a fixing arm (21) is arranged at the lower part of the sleeve (2) of the measuring meter, two through holes are symmetrically arranged on the fixing arm (21), and the fastening screw (3) passes through the through holes and is fixed on the coupling bolt (5).
4. The fastening elongation measuring tool for the large bolt of the runner coupling of the hydroelectric generating set according to claim 3, wherein the connecting arm (42) extends out of the sleeve (2) of the measuring gauge and is perpendicular to the fixing arm (21), two through holes are symmetrically formed in the connecting arm (42), and the fastening screw (3) penetrates through the through holes and is fixed on the coupling bolt (5).
5. The fastening elongation measuring tool for the large bolt of the runner coupling of the hydroelectric generating set according to claim 4 is characterized in that a square hole for the connecting arm (42) to pass through is formed in the lower portion of the sleeve (2) of the measuring gauge, and the height of the square hole is larger than the distance from the surface of the connecting arm (42) to the surface of the coupling bolt (5).
6. The fastening elongation measuring tool for the large bolt of the runner coupling of the hydroelectric generating set according to claim 1, wherein a gap is left between the connecting arm (42) and the end surface of the coupling bolt (5).
7. The tool for measuring the fastening elongation of the large bolt of the wheel coupling shaft of the hydroelectric generating set according to claim 6, characterized in that the distance between the connecting arm (42) and the end surface of the coupling bolt (5) is 8-10 mm.
8. The tool for measuring the fastening elongation of the large bolt of the runner coupling of the hydroelectric generating set according to claim 1, wherein the outer diameter of the measuring arm (41) is smaller than the diameter of the large hole in the center of the sleeve (2) of the measuring gauge.
9. The tool for measuring the fastening elongation of the large bolt of the runner coupling of the hydroelectric generating set according to claim 8, wherein the outer diameter of the measuring arm (41) is 2-3mm smaller than the diameter of the large hole in the center of the sleeve (2) of the measuring gauge.
10. The fastening elongation measuring tool for the large bolt of the runner coupling of the hydroelectric generating set according to any one of claims 1 to 9, wherein the measuring arm (41) is of a solid rod-shaped structure, and the outer diameter of the measuring arm is smaller than the diameter of the central hole of the coupling bolt (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220306663.6U CN217005600U (en) | 2022-02-16 | 2022-02-16 | Hydroelectric set runner shaft coupling big bolt fastening elongation measuring tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220306663.6U CN217005600U (en) | 2022-02-16 | 2022-02-16 | Hydroelectric set runner shaft coupling big bolt fastening elongation measuring tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217005600U true CN217005600U (en) | 2022-07-19 |
Family
ID=82394041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220306663.6U Expired - Fee Related CN217005600U (en) | 2022-02-16 | 2022-02-16 | Hydroelectric set runner shaft coupling big bolt fastening elongation measuring tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217005600U (en) |
-
2022
- 2022-02-16 CN CN202220306663.6U patent/CN217005600U/en not_active Expired - Fee Related
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| 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: 20220719 |
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| CF01 | Termination of patent right due to non-payment of annual fee |