CN103245452B - A kind of High-strength bolt axial force measuring method - Google Patents
A kind of High-strength bolt axial force measuring method Download PDFInfo
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- CN103245452B CN103245452B CN201310208357.4A CN201310208357A CN103245452B CN 103245452 B CN103245452 B CN 103245452B CN 201310208357 A CN201310208357 A CN 201310208357A CN 103245452 B CN103245452 B CN 103245452B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005259 measurement Methods 0.000 claims abstract description 30
- 230000013011 mating Effects 0.000 claims abstract description 5
- 230000036316 preload Effects 0.000 claims description 11
- 239000011888 foil Substances 0.000 claims description 8
- 238000007689 inspection Methods 0.000 description 11
- 238000010276 construction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention discloses a kind of High-strength bolt axial force measuring device and measuring method, measurement mechanism comprises: pull bar, axial force sensor, power provide parts and support; The near-end of pull bar is provided with the connecting portion for being connected with high-strength bolt thread end, and near, the far-end of pull bar are also respectively arranged with first and second auxiliary section; First auxiliary section coordinates with the proximal end face of axial force sensor and contacts, and the second auxiliary section and power provide the far-end mating reaction of parts, and the far-end of support is arranged on power to be provided between parts and axial force sensor, the parts that near-end connects for being supported on high-strength bolt; Also comprise the strain measurement parts for being arranged on nut; Measuring method comprises: strain measurement parts are arranged on the axial external surface of nut by (1); (2) thread end of pull bar and high-strength bolt is connected; (3) tripping force provides parts, according to the situation of change of strain measurement parts, reads the value of axial force sensor in good time.The present invention, by directly measuring High-strength bolt axial power, measures accurately.
Description
Technical field
The present invention relates to a kind of High-strength bolt axial force measuring device and measuring method, particularly relate to a kind of wind power tower High-strength bolt axial force measuring device and measuring method.
Background technology
Wind power tower high-strength bolt connects the lower flange of upper tower cylinder and the upper flange of lower tower cylinder of wind power tower.Bear the load from all directions for a long time, the load of tower cylinder has finally been delivered on the high-strength bolt between connection two sections of tower cylinders.
High-strength bolt connects two sections of tower cylinders, needs to apply pretightning force (i.e. the axle power of bolt), makes tower cylinder can keep fitting together closely.If pretightning force is greater than the pretightning force of design, then high-strength bolt is easy to produce fatigue, and life cycle shortens greatly; If pretightning force is less than the pretightning force of design, then tower cylinder produces when bearing load and rocks, and makes bolt be more prone to loosening.
Bolt axial force is excessive or too smallly all can have an impact to its life cycle, therefore needs, after bolt is executed and twisted, to test to it.Moment check addition is generally taked in 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 nut screwing clamping direction.
(1) the statical moment method of inspection is evenly tighten along the fastening direction of securing member, until fracture, surveys moment values during its fracture.
(2) in use procedure, method of inspection is by the rigging position first after connector is fastening marks, and then unscrews about 1/4 circle, is then tightened to mark position again, checks its screw-down torque value.This method is tightened after loosening again, and the accuracy that the closely connected degree of its screw thread state, joint sheet material, construction error, nut reset has a significant impact moment values.Even if the 2nd time is tightened to origin-location, its value does not reach initial numerical value yet, less than initial value.
(3) namely use torque spanner along nut screwing clamping direction with torque spanner along the method for inspection in nut screwing clamping direction, when reading reach regulation require lower limit, nut does not rotate, reading value during nut rotation be less than regulation require the upper limit then can be judged to be qualified; Still not rotating when not reaching the upper limit nut that namely setting lower limit nut rotates or reading has exceeded setting, being judged as defective.
Statical moment method of inspection requires to be screwed to securing member fracture, belongs to destructive inspection, and the content checking the tightness of the bolt-connection after assembling whether to reach setting for actual requirement is inapplicable.In use procedure, method of inspection in use checks, and the 2nd time numerical value does not reach initial numerical value, generally low than initial digital average by about 10%.Reliable, easy to operate along this method of inspection results contrast of the method for inspection in nut screwing clamping direction with torque spanner, be also current a kind of most widely used method.
In investigation, find to there is following shortcoming and defect in prior art:
Major part method is all detect for the screw-down torque of bolt, 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 the moment of torsion of bolt keeps a timing, torque coefficient is larger, and pretightning force is less, and torque coefficient is less, otherwise pretightning force is larger.In order to check the pretensioning effect of bolt, needing the impact avoiding torque coefficient, directly measuring the pretightning force of bolt.
Summary of the invention
The High-strength bolt axial force measuring device that the object of the present invention is to provide a kind of measuring accuracy high and measuring method, by directly measuring the axle power of high-strength bolt, can avoid utilizing screw-down torque indirectly to control the ill effect of High-strength bolt axial power.
To achieve these goals, the present invention adopts following technical scheme:
A kind of High-strength bolt axial force measuring device, for the different parts of connection and the high-strength bolt of pretension carries out the measurement of axle power, comprising: pull bar, axial force sensor, power provide parts and support; The near-end of described pull bar is provided with the connecting portion for being connected with high-strength bolt thread end, and the near-end of pull bar and far-end are also respectively arranged with the first auxiliary section and the second auxiliary section; First auxiliary section of described pull bar coordinates with the proximal end face of axial force sensor and contacts, and the second auxiliary section of pull bar and power provide the far-end mating reaction of parts; The far-end of described support is arranged on power to be provided between the proximal end face of parts and the distal face of axial force sensor, and the near-end of described support is for being supported on the parts of high-strength bolt connection; Described measurement mechanism also comprising pre-load nut for being arranged on high-strength bolt, measuring the strain measurement parts of nut stroke change; Described axial force sensor carries display unit or is circumscribed with display unit; Described strain measurement members themselves display unit or be 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 concave character type has the hole being suitable for pull bar and passing.
Further, the connecting portion of described pull bar near-end adopts the female thread structure coordinated with high-strength bolt external thread.
Further, first and second auxiliary section of described pull bar is respectively step-like structure.
Further, described power provides parts to be hollow jack, and described pull bar is through hollow jack.
Further, described hollow jack is hydraulic jack.
Further, described strain measurement parts are foil gauge.
Adopt above-mentioned High-strength bolt axial force measuring device to carry out the method for axle power measurement, comprising:
(1) strain measurement parts are arranged on the axial external surface of the pre-load nut of high-strength bolt;
(2) pull bar is connected by the connecting portion of its near-end and the thread end of high-strength bolt;
(3) tripping force provides parts, makes pull bar pull high-strength bolt, and the pre-load nut of high-strength bolt has the trend of resilience, when the measurement numerical value of strain measurement parts changes and is stabilized in certain interval, reads the value of axial force sensor.
Further, described strain measurement parts are foil gauge, and foil gauge is 2, and symmetry is pasted onto the axial external surface of the pre-load nut of high-strength bolt.
Compared with prior art, the present invention has following beneficial effect:
1, present invention achieves directly measurement High-strength bolt axial power, avoid the ill effect utilizing screw-down torque indirectly to control High-strength bolt axial power, this apparatus structure is simple, and measuring method is simple, and measuring accuracy is high, reduces cost, improves work efficiency.
2, the present invention is by directly measuring High-strength bolt axial power, has grasped the situation of high-strength bolt pretension, thus can the pre-fastening moment of reverse high-strength bolt, for the moment selection of in-site installation construction provides foundation.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is High-strength bolt axial force measuring device using state cut-open view (wind power tower high-strength bolt) of the present invention;
Fig. 2,3 is the using state figure (wind power tower high-strength bolt) of High-strength bolt axial force measuring device different angles of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
High-strength bolt axial force measuring device of the present invention, be mainly used in carrying out the measurement of axle power to the high-strength bolt of the also pretension of connection two parts, the present embodiment is measured as example to carry out axle power to the high-strength bolt connecting wind power tower, this High-strength bolt axial force measuring device is described, but be not limited to the connection of wind power tower, this axle force measuring device is applicable to any use high-strength bolt and connects and the situation needing to measure axle power.
For the ease of understanding, first make an explanation to partial words of the present utility model, near-end wherein refers to the one end near high-strength bolt, and far-end wherein refers to the one 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 pretension, is also provided with pad 4 between nut 5 and lower flange 3.High-strength bolt axial force measuring device of the present invention, comprising: 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 for being connected with high-strength bolt 1 thread end, and the near-end of pull bar 10 and far-end are also respectively arranged with the first auxiliary section 102 and the second auxiliary section 103; First auxiliary section 102 of pull bar 10 coordinates with the proximal end face of axial force sensor 7 and contacts, second auxiliary section 103 and the power of pull bar 10 provide the far-end mating reaction of parts 9, the far-end of support 8 is arranged on power to be provided between the proximal end face of parts 9 and the distal face of axial force sensor 7, with two end contacts, provide support power, the near-end of support 8 is for being supported on the parts (lower flange 3 of upper tower cylinder) of high-strength bolt 1 connection; Measurement mechanism also comprising pre-load nut 5 for being arranged on high-strength bolt 1, measuring the strain measurement parts 6 of nut 5 stroke 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 concave character type has the hole being suitable for pull bar 10 and passing, and it should be noted that, support 8 is not limited to said structure.
Preferably, the connecting portion 101 of above-mentioned pull bar 10 near-end can adopt the female thread structure coordinated with high-strength bolt 1 external thread, it should be noted that, connecting portion 101 is wherein not limited to female thread structure, other any clamping class be fastenedly connected parts.
Preferably, first and second auxiliary section 102,103 of above-mentioned pull bar 10 is respectively step-like structure, it should be noted that, 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 with power.
Preferably, above-mentioned power provides parts 9 for hollow jack, and pull bar 10 is through hollow jack, and hollow jack can select hydraulic jack, also can select Pneumatic jack.It should be noted that, power provides parts 9 to be not limited to hollow jack, any parts that can provide thrust or pulling force.
Preferably, above-mentioned strain measurement parts 6 are foil gauge.
The principle of work of above-mentioned High-strength bolt axial force measuring device is:
The distant station stage structure of pull bar 10 up promotes under hollow jack suppresses effect, the female thread structure of pull bar 10 near-end matches with high-strength bolt 1, according to the transmission effect of power, high-strength bolt 1 is further stretched, but this process is also in the elastic properties of materials deformation stage of high-strength bolt 1, therefore can not cause damage to bolt.High-strength bolt 1 is stretched, and nut 5 produces the trend being returned to original length, and when nut 5 length value changes and is stabilized in certain interval, the value that now axial force sensor 7 is measured is exactly the axle power of high-strength bolt 1.
Adopt above-mentioned High-strength bolt axial force measuring device to carry out the method for axle power measurement, comprising:
(1) 2 foil gauge symmetries are pasted onto the axial external surface of the pre-load nut 5 of high-strength bolt 1;
(2) connecting portion 101 of pull bar 10 by its near-end is connected with 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, Bolt Torque when those skilled in the art can detect according to reality and determining.
Contrasted by the axle power of measurement and the axle power of design, can make the pretension situation of bolt fast and whether reasonably judging.In addition, can also according to the engineering construction value of axle power correction moment of torsion measured, specific as follows:
T=KFd, in formula, T is construction moment of torsion, and K is the torque coefficient that bolt is installed, and F is bolt axial force, and d is bolt cross section effective diameter.
At the scene in construction, by measuring F, the K value that can obtain from producer, according to above-mentioned formula, calculating the construction torque T of bolt, contrasting on-the-spot practice of construction moment of torsion, it is corrected.Moment for in-site installation construction is selected to provide foundation.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a High-strength bolt axial force measuring method, adopt High-strength bolt axial force measuring device, this High-strength bolt axial force measuring device comprises: pull bar, axial force sensor, power provide parts and support;
The near-end of described pull bar is provided with the connecting portion for being connected with high-strength bolt thread end, and the near-end of pull bar and far-end are also respectively arranged with the first auxiliary section and the second auxiliary section; First auxiliary section of described pull bar coordinates with the proximal end face of axial force sensor and contacts, and the second auxiliary section of pull bar and power provide the far-end mating reaction of parts;
The far-end of described support is arranged on power to be provided between the proximal end face of parts and the distal face of axial force sensor, and the near-end of described support is for being supported on the parts of high-strength bolt connection;
Described measurement mechanism also comprising pre-load nut for being arranged on high-strength bolt, measuring the strain measurement parts of nut stroke change;
Described axial force sensor carries display unit or is circumscribed with display unit; Described strain measurement members themselves display unit or be circumscribed with display unit;
It is characterized in that, described axle force measuring method comprises:
(1) strain measurement parts are arranged on the axial external surface of the pre-load nut of high-strength bolt;
(2) pull bar is connected by the connecting portion of its near-end and the thread end of high-strength bolt;
(3) tripping force provides parts, makes pull bar pull high-strength bolt, and the pre-load nut of high-strength bolt has the trend of resilience, when the measurement numerical value of strain measurement parts changes and is stabilized in certain interval, reads the value of axial force sensor.
2. High-strength bolt axial force measuring method 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 concave character type has the hole being suitable for pull bar and passing.
3. High-strength bolt axial force measuring method according to claim 1 and 2, is characterized in that, first and second auxiliary section of described pull bar is respectively step-like structure.
4. High-strength bolt axial force measuring method according to claim 1 and 2, is characterized in that, described power provides parts to be hollow jack, and described pull bar is through hollow jack.
5. High-strength bolt axial force measuring method according to claim 4, is characterized in that, described hollow jack is hydraulic jack.
6. High-strength bolt axial force measuring method according to claim 1 and 2, is characterized in that, described strain measurement parts are foil gauge, and foil gauge is 2, and symmetry is pasted onto the axial external surface of the pre-load nut of high-strength bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310208357.4A CN103245452B (en) | 2013-05-30 | 2013-05-30 | A kind of High-strength bolt axial force measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310208357.4A CN103245452B (en) | 2013-05-30 | 2013-05-30 | A kind of High-strength bolt axial force measuring method |
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| CN103245452A CN103245452A (en) | 2013-08-14 |
| CN103245452B true CN103245452B (en) | 2015-09-09 |
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2013
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Address after: 100034, Beijing Xicheng District Fuchengmen North Avenue, 6-9 international investment building, block C, 10 Applicant after: Longyuan (Beijing) Wind Power Engineering Technology Co., Ltd. Address before: 100034, Haidian District, Beijing, Zhongguancun South Street, No. 52, China Foreign Exchange Building 618 Applicant before: Longyuan (Beijing) Wind Power Engineering Technology Co., Ltd. |
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