CN203275004U - A high-strength bolt axial force measuring apparatus - Google Patents
A high-strength bolt axial force measuring apparatus Download PDFInfo
- Publication number
- CN203275004U CN203275004U CN 201320304678 CN201320304678U CN203275004U CN 203275004 U CN203275004 U CN 203275004U CN 201320304678 CN201320304678 CN 201320304678 CN 201320304678 U CN201320304678 U CN 201320304678U CN 203275004 U CN203275004 U CN 203275004U
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- strength bolt
- pull bar
- axial force
- force measuring
- measuring device
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Abstract
The utility model discloses a high-strength bolt axial force measuring apparatus comprising a pull bar, an axial force sensor, a force supplying component, and a support. The near end of the pull bar is equipped with a connection portion used for being connected with the thread end of a high-strength bolt. The near end of the pull bar is equipped with a first cooperation portion while the far end of the pull bar is equipped with a second cooperation portion. The first cooperation portion cooperates with and contacts the near end face of the axial force sensor. The second cooperation portion cooperates with the far end of the force supplying component. The far end of the support is installed between the near end face of the force supplying component and the far end face of the axial force sensor. The near end of the support is used for supporting a member connected with the high-strength bolt. The high-strength bolt axial force measuring apparatus also comprises a strain measuring component which is installed on a screw nut and which measures the change of stretching amount of the screw nut. The high-strength bolt axial force measuring apparatus directly measures the axial force of the high-strength bolt and prevents a bad effect of indirectly controlling the axial force of the high-strength bolt by using tightening torque. The high-strength bolt axial force measuring apparatus has characteristics of simple structure, high measuring precision, reduced cost, and increased work efficiency, and is suitable for popularization and application.
Description
Technical field
The utility model relates to a kind of high-strength bolt axle force measuring device, relates in particular to a kind of wind power tower high-strength bolt axle force measuring device.
Background technology
The lower flange of the upper tower cylinder of wind power tower high-strength bolt connection wind power tower and the upper flange of lower tower cylinder.Bear for a long time the load from all directions, the load of tower cylinder finally has been delivered to and has connected on two sections high-strength bolts between the tower cylinder.
High-strength bolt connects two sections tower cylinders, need to apply pretightning force (being the axle power of bolt), makes the tower cylinder can keep fitting together closely.If pretightning force is greater than the pretightning force of design, high-strength bolt is easy to produce fatigue, and life cycle shortens greatly; If pretightning force is less than the pretightning force of design, the tower cylinder produces when bearing load and rocks, and makes bolt be more prone to loosening.
Bolt shaft power is excessive or too smallly all can exert an influence to its life cycle, therefore need to bolt execute twist after, it is tested.The moment check addition is generally taked in the conventional bolt verification: (1) statical moment method of inspection; (2) method of inspection in use procedure; (3) with the method for inspection of torque spanner along the nut screwing clamping direction.
(1) the statical moment method of inspection is for evenly to tighten along the fastening direction of securing member, until fracture, the moment values when surveying its fracture.
(2) in use procedure, method of inspection is by first marking on the rigging position after connector is fastening, then unscrew approximately 1/4 circle, then tighten to mark position again, checking its screw-down torque value.This method is tightened due to after loosening again, and the accuracy that its screw thread state, the closely connected degree of joint sheet material, construction error, nut reset has a significant impact moment values.Even the 2nd time tightens to the origin-location, its value does not reach initial numerical value yet, and is less than initial value.
(3) namely use torque spanner along the nut screwing clamping direction with torque spanner along the method for inspection of nut screwing clamping direction, require lower limit when reading reaches regulation, nut does not rotate, and it is qualified that the upper limit that the reading value during nut rotation requires less than regulation can be judged to be; When the upper limit nut that does not reach that setting lower limit nut namely rotates or reading has surpassed setting still do not rotate be judged as defective.
The statical moment method of inspection requires to be screwed to the securing member fracture, belongs to destructive check, and the content whether fastening degree of the bolt-connection after check has been assembled for actual requirement has reached setting is inapplicable.In use procedure, method of inspection is in use to check, and the 2nd time numerical value does not reach initial numerical value, generally than low 10% left and right of initial digital average.Reliable, easy to operate along this method of inspection result of the method for inspection of nut screwing clamping direction with torque spanner, be also present a kind of most widely used method.
In investigation, find to exist in prior art following shortcoming and defect:
Major part method is all that the screw-down torque for bolt detects, and ignores the impact of torque coefficient.
The torque coefficient of bolt has a great impact tools for bolts ' pretension.The pretightning force of bolt is directly proportional to screw-down torque, is inversely proportional to torque coefficient.When moment of torsion maintenance one timing of bolt, torque coefficient is larger, and pretightning force is less, and torque coefficient is less, otherwise pretightning force is larger.In order to check the pretension effect of bolt, need to avoid the impact of torque coefficient, directly measure the pretightning force of bolt.
The utility model content
The high-strength bolt axle force measuring device that provides a kind of measuring accuracy high is provided the purpose of this utility model, by the axle power of direct measurement high-strength bolt, can avoid utilizing screw-down torque to come the ill effect of indirectly control high-strength bolt axle power.
To achieve these goals, the utility model adopts following technical scheme:
A kind of high-strength bolt axle force measuring device is used for that the high-strength bolt that connects different parts and pretension is carried out axle power and measures, and comprising: pull bar, axial force sensor, power provide parts and support; The near-end of described pull bar is provided with the connecting portion that is connected for the high-strength bolt thread end, and the near-end of pull bar and far-end also are respectively arranged with the first auxiliary section and the second auxiliary section; The first auxiliary section of described pull bar contacts with the cooperation of the proximal end face of axial force sensor, the far-end mating reaction that the second auxiliary section of pull bar and power provide parts; The far-end of described support is arranged on power to be provided between the distal face of the proximal end face of parts and axial force sensor, and the near-end of described support is used for being supported on the parts that high-strength bolt connects; Described measurement mechanism also comprises be used to the pre-load nut that is arranged on high-strength bolt, measures the strain measurement parts that the nut stroke changes; Described axial force sensor carries display unit or is circumscribed with display unit; Described strain measurement parts carry display unit or are circumscribed with display unit.
Further, the longitudinal section of described support is for falling concave character type, and the upper end of the described support of falling the concave character type has and is suitable for the hole that pull bar passes.
Further, the connecting portion of described pull bar near-end adopts the female thread structure that coordinates with the high-strength bolt external thread.
Further, first and second auxiliary section of described pull bar is respectively step-like structure.
Further, it is hollow lifting jack that described power provides parts, and described pull bar passes hollow lifting jack.
Further, described hollow lifting jack is hydraulic jack.
Further, described strain measurement parts are foil gauge.
Further, described foil gauge is 2
Compared with prior art, the utlity model has following beneficial effect:
1, the utility model has been realized direct measurement high-strength bolt axle power, has avoided utilizing screw-down torque to come the ill effect of indirectly control high-strength bolt axle power, and this apparatus structure is simple, and measuring accuracy is high, has reduced cost, has improved work efficiency.
2, the utility model by directly measuring high-strength bolt axle power, has been grasped the situation of high-strength bolt pretension, thus pre-fastening moment that can the reverse high-strength bolt, for the moment selection of on-the-spot installation provides foundation.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is that high-strength bolt axle force measuring device of the present utility model uses state cut-open view (wind power tower high-strength bolt);
Fig. 2,3 is the use constitutional diagram (wind power tower high-strength bolt) of the utility model high-strength bolt axle force measuring device different angles.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in restriction the utility model.
High-strength bolt axle force measuring device of the present utility model, be mainly used in carrying out the measurement of axle power to connecting high-strength bolt two parts and pretension, the present embodiment is measured as example so that the high-strength bolt that connects wind power tower is carried out axle power, this high-strength bolt axle force measuring device is described, but be not limited to the connection of wind power tower, this axle force measuring device is applicable to the situation that any use high-strength bolt connects and need to measure axle power.
For the ease of understanding, first part word of the present utility model is made an explanation, near-end wherein refers to the end near high-strength bolt, far-end wherein refers to the end away from high-strength bolt.
As shown in Figure 1, 2, 3, under wind power tower, the upper flange 2 of tower cylinder is connected by high-strength bolt 1 with the lower flange 3 of upper tower cylinder, and by nut 5 pretensions, between nut 5 and lower flange 3, pad 4 is installed also.High-strength bolt axle force measuring device of the present utility model comprises: pull bar 10, axial force sensor 7, support 8 and power provide parts 9; The near-end of pull bar 10 is provided with the connecting portion 101 that is connected for high-strength bolt 1 thread end, and the near-end of pull bar 10 and far-end also are respectively arranged with the first auxiliary section 102 and the second auxiliary section 103; The first auxiliary section 102 of pull bar 10 contacts with the cooperation of the proximal end face of axial force sensor 7, the second auxiliary section 103 and the power of pull bar 10 provides the far-end mating reaction of parts 9, the far-end of support 8 is arranged on power to be provided between the distal face of the proximal end face of parts 9 and axial force sensor 7, with two end contacts, provide support power, the near-end of support 8 is used for being supported on the parts (lower flange 3 of upper tower cylinder) that high-strength bolt 1 connects; Measurement mechanism also comprises be used to the pre-load nut 5 that is arranged on high-strength bolt 1, measures the strain measurement parts 6 that nut 5 strokes change; Axial force sensor 7 can carry display unit, also can be circumscribed with display unit by circuit; Strain measurement parts 6 can carry display unit, also can be circumscribed with display unit by circuit.
Preferably, the longitudinal section of support 8 is for falling concave character type, and the upper end of the support of falling the concave character type has and is suitable for the hole that pull bar 10 passes, and need to prove, support 8 is not limited to said structure.
Preferably, the connecting portion 101 of above-mentioned pull bar 10 near-ends can adopt the female thread structure that coordinates with high-strength bolt 1 external thread, need to prove, connecting portion 101 wherein is not limited to female thread structure, and the parts that are fastenedly connected of other any clamping class all can.
Preferably, first and second auxiliary section 102,103 of above-mentioned pull bar 10 is respectively step-like structure, need to prove, first and second auxiliary section is not limited to step-like structure, any can cooperation with the proximal end face of axial force sensor 7 contacts, and provides the structure of the far-end mating reaction of parts 9 all can with power.
Preferably, above-mentioned power provides parts 9 to be hollow lifting jack, and pull bar 10 passes hollow lifting jack, and hollow lifting jack can be selected hydraulic jack, also can select Pneumatic jack.Need to prove, power provides parts 9 to be not limited to hollow lifting jack, and any parts of thrust or pulling force that can provide all can.
Preferably, above-mentioned strain measurement parts 6 are foil gauge, and foil gauge is 2.
The principle of work of above-mentioned high-strength bolt axle force measuring device is:
The distant station stage structure of pull bar 10 is suppressed under effect at hollow lifting jack and is up promoted, the female thread structure of pull bar 10 near-ends matches with high-strength bolt 1, transfer function according to power, high-strength bolt 1 is further stretched, but this process also is in the elastic properties of materials deformation stage of high-strength bolt 1, therefore can be to the bolt injury.High-strength bolt 1 is stretched, and nut 5 produces the trend that is returned to original length, and nut 5 length values change and when being stabilized in certain interval in, this moment, the value of axial force sensor 7 measurements was exactly the axle power of high-strength bolt 1.
Adopt above-mentioned high-strength bolt axle force measuring device to carry out the method that axle power is measured, comprising:
(1) 2 foil gauge symmetries are sticked on the axial external surface of the pre-load nut 5 of high-strength bolt 1;
(2) pull bar 10 is connected by the connecting portion 101 of its near-end and the thread end of high-strength bolt 1;
(3) tripping force provides parts 9, makes pull bar 10 pull high-strength bolt 1, and the pre-load nut 5 of high-strength bolt 1 has the trend of resilience, when the measurement numerical value of foil gauge changes and is stabilized in certain interval, reads the value of axial force sensor 7.Above-mentioned certain interval, the Bolt Torque when those skilled in the art can detect according to reality is decided.
By the axle power of measurement and the axle power contrast of design, can make whether reasonably judgement to the pretension situation of bolt fast.In addition, can also be according to the engineering construction value of the axle power correction moment of torsion of measuring, specific as follows:
T=KFd, in formula, T is the construction moment of torsion, and K is the torque coefficient that bolt is installed, and F is bolt shaft power, and d is bolt cross section effective diameter.
At the scene in the construction, by measuring F, the K value that can obtain from producer, according to above-mentioned formula, the construction torque T of calculating bolt contrasts on-the-spot practice of construction moment of torsion, and it is proofreaied and correct.For the moment of on-the-spot installation selects to provide foundation.
It should be noted that at last: the above only is preferred embodiment of the present utility model, be not limited to the utility model, although with reference to previous embodiment, the utility model is had been described in detail, for a person skilled in the art, it still can be modified to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (8)
1. a high-strength bolt axle force measuring device, be used for that the high-strength bolt that connects different parts and pretension is carried out axle power and measure, and it is characterized in that, comprising: pull bar, axial force sensor, power provide parts and support;
The near-end of described pull bar is provided with the connecting portion that is connected for the high-strength bolt thread end, and the near-end of pull bar and far-end also are respectively arranged with the first auxiliary section and the second auxiliary section; The first auxiliary section of described pull bar contacts with the cooperation of the proximal end face of axial force sensor, the far-end mating reaction that the second auxiliary section of pull bar and power provide parts;
The far-end of described support is arranged on power to be provided between the distal face of the proximal end face of parts and axial force sensor, and the near-end of described support is used for being supported on the parts that high-strength bolt connects;
Described measurement mechanism also comprises be used to the pre-load nut that is arranged on high-strength bolt, measures the strain measurement parts that the nut stroke changes;
Described axial force sensor carries display unit or is circumscribed with display unit; Described strain measurement parts carry display unit or are circumscribed with display unit.
2. high-strength bolt axle force measuring device according to claim 1, is characterized in that, the longitudinal section of described support is for falling concave character type, and the upper end of the described support of falling the concave character type has and is suitable for the hole that pull bar passes.
3. high-strength bolt axle force measuring device according to claim 1 and 2, is characterized in that, the connecting portion of described pull bar near-end adopts the female thread structure that coordinates with the high-strength bolt external thread.
4. high-strength bolt axle force measuring device according to claim 1 and 2, is characterized in that, first and second auxiliary section of described pull bar is respectively step-like structure.
5. high-strength bolt axle force measuring device according to claim 1 and 2, is characterized in that, it is hollow lifting jack that described power provides parts, and described pull bar passes hollow lifting jack.
6. high-strength bolt axle force measuring device according to claim 5, is characterized in that, described hollow lifting jack is hydraulic jack.
7. high-strength bolt axle force measuring device according to claim 1 and 2, is characterized in that, described strain measurement parts are foil gauge.
8. high-strength bolt axle force measuring device according to claim 7, is characterized in that, described foil gauge is 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320304678 CN203275004U (en) | 2013-05-30 | 2013-05-30 | A high-strength bolt axial force measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320304678 CN203275004U (en) | 2013-05-30 | 2013-05-30 | A high-strength bolt axial force measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203275004U true CN203275004U (en) | 2013-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320304678 Expired - Fee Related CN203275004U (en) | 2013-05-30 | 2013-05-30 | A high-strength bolt axial force measuring apparatus |
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| CN (1) | CN203275004U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245452A (en) * | 2013-05-30 | 2013-08-14 | 龙源（北京）风电工程技术有限公司 | High-strength bolt axial force measuring device and measuring method |
| CN107314895A (en) * | 2017-07-05 | 2017-11-03 | 深圳市樊溪电子有限公司 | The rotation detection device and detection method of a kind of wind-powered electricity generation structure stud |
| CN107748031A (en) * | 2017-09-14 | 2018-03-02 | 中铁大桥科学研究院有限公司 | A kind of cord clip of suspension bridge screw rod axle power detection servicing unit and detection method |
| CN109477765A (en) * | 2016-06-30 | 2019-03-15 | 株式会社华尔卡 | Device is practiced in fastening, method is practiced in fastening, program is practiced in fastening and fastening practice system |
| CN113358262A (en) * | 2021-07-22 | 2021-09-07 | 中车大同电力机车有限公司 | Ferrule type joint pull-out force detection device and method |
-
2013
- 2013-05-30 CN CN 201320304678 patent/CN203275004U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103245452A (en) * | 2013-05-30 | 2013-08-14 | 龙源（北京）风电工程技术有限公司 | High-strength bolt axial force measuring device and measuring method |
| CN109477765A (en) * | 2016-06-30 | 2019-03-15 | 株式会社华尔卡 | Device is practiced in fastening, method is practiced in fastening, program is practiced in fastening and fastening practice system |
| CN107314895A (en) * | 2017-07-05 | 2017-11-03 | 深圳市樊溪电子有限公司 | The rotation detection device and detection method of a kind of wind-powered electricity generation structure stud |
| CN107314895B (en) * | 2017-07-05 | 2018-10-09 | 福州市长乐区三互信息科技有限公司 | A kind of rotation detection device and detection method of wind-powered electricity generation structure stud |
| CN107748031A (en) * | 2017-09-14 | 2018-03-02 | 中铁大桥科学研究院有限公司 | A kind of cord clip of suspension bridge screw rod axle power detection servicing unit and detection method |
| CN113358262A (en) * | 2021-07-22 | 2021-09-07 | 中车大同电力机车有限公司 | Ferrule type joint pull-out force detection device and method |
| CN113358262B (en) * | 2021-07-22 | 2023-02-28 | 中车大同电力机车有限公司 | Ferrule type joint pull-out force detection device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20160530 |
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| CF01 | Termination of patent right due to non-payment of annual fee |