CN105300683A - Bolt torque coefficient measurement testing stand - Google Patents
Bolt torque coefficient measurement testing stand Download PDFInfo
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- CN105300683A CN105300683A CN201510867287.2A CN201510867287A CN105300683A CN 105300683 A CN105300683 A CN 105300683A CN 201510867287 A CN201510867287 A CN 201510867287A CN 105300683 A CN105300683 A CN 105300683A
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Abstract
The invention relates to a bolt torque coefficient measurement testing stand which is composed of a resistance strain gauge, a torque sensor, a worm gear transmission mechanism, a support and a tested bolt connection assembly. The tested bolt connection assembly is fixed on a base plate of the support. A tested bolt rod part of the tested bolt connection assembly is provided with a strain gauge in a bonding manner, and the strain gauge is connected with the resistance strain gauge. A lower end of a worm gear of the worm gear transmission mechanism is connected with the torque sensor. The torque sensor is connected with a tested bolt through a hexagonal box spanner. During measurement, the worm gear transmission mechanism exerts tightening torque on the tested bolt, the tightening torque value is read out by the torque sensor, and the resistance strain gauge collects strain of the tested bolt rod part and coverts the strain into an axial force of the tested bolt part. According to the invention, the torque sensor tests the tightening torque value of the tested bolt by the torque sensor, and the stress-strain value of the tested bolt rod part is tested by the resistance strain gauge, so that the relation between the tightening toque of the bolt and the axial force can be quantitatively determined, and the bolt torque coefficient can be tested.
Description
Technical field
The present invention relates to a kind of test platform measuring torque coefficient of bolt, especially a kind of for measuring the relation between bolt tightening moment and axial force (stress), also can the indirect inspection bolt thread field of conjugate action, under nut along the measuring test-bed of friction factor contacting end face.
Background technology
Bolt-connection is widely used in plant equipment, and most bolt all needs pretension when assembling, and the screw-down torque generally by controlling bolt controls pretightning force.Bolt tightening moment T is for overcoming under the screw thread moment of resistance T1 of screw thread pair and nut along contacting end face moment of friction T2 with connected compcnent.Note bolt axial tension is F, then have T=K × F × d, d to be bolt diameter, K is torque coefficient of bolt, relevant with the factor such as version, material properties, surface of contact lubricating status of bolt-connection.In Machine Design, torque coefficient generally by consulting " mechanical design handbook " or relying on design experiences to determine often have very large uncertainty, having relatively large deviation when determining bolt tightening moment, can not meet structural design needs.
At present, there is torque coefficient of bolt surveying instrument on the market, the original pretension of bolt, average pretension, average torque, torque coefficient, standard deviation can be measured, but according to the technical parameter in its instructions, can only test seven kinds of bolts of M12 ~ M30, the bolt for more than M30 cannot be measured.Domestic also have the torque gauge being specifically designed to torque coefficient of bolt and measuring, generally tightened by dial torque wrench, torque coefficient under quantitative screw-down torque can only be tested, draw the mean value of test batch torque coefficient of bolt with this, and as the guide data of this batch of product screw-down torque.The method only with the moment of torsion screwing force relation of the data of some reflection loading complete process, causes test figure confidence level not high, and when particularly mounting torque differs larger with test moment of torsion, error will be larger.Meanwhile, owing to adopting dial torque wrench to tighten, stability and the accuracy of protecting screw-down torque data is difficult to.
In bolt-connection, suitable screw-down torque is all necessary for bolt and connected compcnent.Screw-down torque excessive often causing connects inefficacy, even there will be bolt strength deficiency and ruptures; Too small screw-down torque makes again bolt-connection unreliable, excessive and fatigure failure occurs by stress easy after operating load.Therefore, determine that torque coefficient of bolt plays vital effect for the accurate applying of bolt tightening moment and the normal work of bolt-connection.
Summary of the invention
The object of the invention is to the relation by measuring between bolt tightening moment and axial force, and then determine torque coefficient of bolt, in the hope of accurately controlling bolt shank pre-tight stress, and providing a kind of torque coefficient of bolt measuring test-bed.
For achieving the above object, technical scheme of the present invention is: a kind of torque coefficient of bolt measuring test-bed, be made up of electric wire strain gauge, torque sensor, Worm and worm-wheel gearing, support, tested bolt connection assembly, described tested bolt connection assembly is fixed on the base plate of support, tested bolt shank in tested bolt connection assembly posts strainometer, and strainometer is connected with electric wire strain gauge; Worm gear lower end in described Worm and worm-wheel gearing connects torque sensor, torque sensor connects tested bolt by Hexagonal jacket, during measurement, described Worm and worm-wheel gearing applies screw-down torque to tested bolt, screw-down torque numerical value is read by torque sensor, electric wire strain gauge gathers tested bolt shank and strains and be scaled tested bolt shank axial force, measures the torque coefficient of tested bolt thus.
Described support is made up of top board, column, base plate, and two root posts are fixedly connected on the left and right two ends of substrate respectively, and two root post upper ends are fixedly connected with top board; On inside described column, guide rail is housed, guide rail coordinates and to be slidably connected slide plate, above slide plate by two lift-bolts and on nut support on top board; Worm and worm-wheel gearing is connected below described slide plate.
Described Worm and worm-wheel gearing comprises clutch shaft bearing, worm gear, worm screw, handwheel, the second bearing, described worm screw is arranged on the bearing of both sides below slide plate by the second bearing, the worm gear upper end be connected with worm mesh is arranged in slide plate centre by clutch shaft bearing, and described worm screw one end connects handwheel.
Described tested bolt connection assembly comprises bolt connected compcnent, pressing plate, tested bolt, and described tested bolt is placed in bolt connected compcnent, and bolt connected compcnent is fixed on base plate by pressing plate.
Beneficial effect of the present invention:
The present invention measures bolt tightening moment numerical value by torque sensor, measures bolt shank ess-strain numerical value, quantitatively can determine the relation of bolt tightening moment and axial force accordingly, measure torque coefficient of bolt by electric wire strain gauge.This testing table adopts worm-and-wheel gear to apply moment of torsion, and through experimental test, the screw-down torque for below 2900N.m can by single applying, and therefore, this test mechanism has examples of many successful for testing below M45 bolt (screw-down torque is less than 2900N.m).
It is steady that the present invention applies torque drive by worm-and-wheel gear, and mechanism has self-locking performance, namely can only drive worm-drive by worm screw, like this can the stability of test data in warranty test process; Worm-and-wheel gear is one comparatively labour-saving mechanism, can by the moment of torsion that single applying is larger in less space, for needing the measurement of the torque coefficient of the bolt applying larger screw-down torque; By torque sensor, electric wire strain gauge can arbitrary size screw-down torque and bolt shank axial force now within the scope of the real time measure bolt-connection component strength, thus determines the torque coefficient of bolt under this state.
Accompanying drawing explanation
Fig. 1 is the main cut-open view of structure of torque coefficient of bolt measuring test-bed of the present invention;
Fig. 2 is the left cut-open view of Fig. 1;
Fig. 3 is one of schematic perspective view of torque coefficient of bolt measuring test-bed of the present invention;
Fig. 4 is the schematic perspective view two of torque coefficient of bolt measuring test-bed of the present invention;
Fig. 5 is screw-down torque in bolt loading procedure-axial force graph of relation.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figures 1 to 4, a kind of torque coefficient of bolt measuring test-bed, is made up of electric wire strain gauge, torque sensor 15, Worm and worm-wheel gearing, support, tested bolt connection assembly.Mainly comprise lift-bolt 1, top board 2, slide plate 3, column 4, clutch shaft bearing 5, worm gear 6, worm screw 7, handwheel 8, second bearing 9, bolt connected compcnent 10, base plate 11, guide rail 12, pressing plate 13, tested bolt 14, torque sensor 15, Hexagonal jacket 16.
Tested bolt connection assembly is fixed on the base plate 11 of support, and strainometer is posted in the tested bolt 14 bar portion in tested bolt connection assembly, and strainometer is connected with electric wire strain gauge.Worm gear 6 lower end in Worm and worm-wheel gearing connects torque sensor 15, torque sensor 15 connects tested bolt 14 by Hexagonal jacket 16, during measurement, described Worm and worm-wheel gearing applies screw-down torque to tested bolt 14, screw-down torque numerical value is read by torque sensor 15, electric wire strain gauge gathers tested bolt 14 bar portion and strains and be scaled tested bolt 14 bar portion axial force, measures the torque coefficient of tested bolt 14 thus.
Support is made up of top board 2, column 4, base plate 11, and two root posts 4 are fixedly connected on base plate 11 left and right two ends above respectively, and two root post 4 upper ends are fixedly connected with top board 2; On inside described column 4, guide rail 12 is housed, guide rail 12 coordinates and to be slidably connected slide plate 3, slide plate 3 above by two lift-bolts 1 and on nut support on top board 2; Described, slide plate 3 connects Worm and worm-wheel gearing below.
Worm and worm-wheel gearing comprises clutch shaft bearing 5, worm gear 6, worm screw 7, handwheel 8, second bearing 9, described worm screw 7 is arranged on the bearing of both sides below slide plate 3 by the second bearing 9, worm gear 6 upper end be connected with a joggle with worm screw 7 is arranged in slide plate 3 centre by clutch shaft bearing 5, and worm screw 7 one end connects handwheel 8.
Tested bolt connection assembly comprises bolt connected compcnent 10, pressing plate 13, tested bolt 14, and described tested bolt 14 is placed in bolt connected compcnent 10, and bolt connected compcnent 10 is fixed on base plate 11 by pressing plate 13.
During use, regulate the position of Worm and worm-wheel gearing, its sleeve has been coordinated with bolt hexagon head, rotate Worm and worm-wheel gearing, tight a bolt.Read bolt tightening moment numerical value by torque sensor, when being loaded into a certain degree, gathering bolt shank ess-strain numerical value by electric wire strain gauge, be scaled the quantitative relationship (Fig. 5) measuring screw-down torque and axial force.
During test, tested bolt 14 bar portion posts strainometer and after being connected with electric wire strain gauge, forming tested bolt-connection assembly, be fixed on test-bed base plate 11 with bolt connected compcnent 10.Hexagonal jacket 16 is aimed at tested bolt 14 hexagon head, unscrew the nut on lift-bolt 1, make slide plate 3 slide down to Hexagonal jacket 16 along guide rail 12 and stretch into tested bolt 14 hexagon head, manual rotation handwheel 8, Worm and worm-wheel gearing applies screw-down torque to tested bolt 14, read screw-down torque numerical value by torque sensor 15, electric wire strain gauge gathers tested bolt 14 bar portion and strains and be scaled bolt shank axial force (stress), can measure torque coefficient of bolt thus.
For this test bed testing effect is described, choose battery of tests data instance card.In this test, bolt thread portion is coated with Molykote, and nut and connected compcnent surface in contact are coated with sealant, has carried out 5 tests altogether, has unloaded completely after having loaded (being all loaded on 2900N.m) at every turn.Test figure is as follows:
Table 1 torque coefficient of bolt measuring test-bed test result
Screw-down torque, axial strain (power) are measured value, and torque coefficient, thread friction coefficient, nut friction factor are scaled value.
By experimental test result, threaded portion is coated with Molykote, under the state that nut and connected compcnent surface in contact are coated with sealant, and torque coefficient of bolt desirable 0.11.
Claims (4)
1. a torque coefficient of bolt measuring test-bed, be made up of electric wire strain gauge, torque sensor (15), Worm and worm-wheel gearing, support, tested bolt connection assembly, it is characterized in that: described tested bolt connection assembly is fixed on the base plate (11) of support, strainometer is posted in tested bolt (14) bar portion in tested bolt connection assembly, and strainometer is connected with electric wire strain gauge; Worm gear (6) lower end in described Worm and worm-wheel gearing connects torque sensor (15), torque sensor (15) connects tested bolt (14) by Hexagonal jacket (16), during measurement, described Worm and worm-wheel gearing applies screw-down torque to tested bolt (14), screw-down torque numerical value is read by torque sensor (15), electric wire strain gauge gathers tested bolt (14) bar portion and strains and be scaled tested bolt (14) bar portion axial force, measures the torque coefficient of tested bolt (14) thus.
2. torque coefficient of bolt measuring test-bed according to claim 1, it is characterized in that: described support is made up of top board (2), column (4), base plate (11), two root posts (4) are fixedly connected on base plate (11) left and right two ends above respectively, and two root posts (4) upper end is fixedly connected with top board (2); Guide rail (12) is equipped with in inner side to described column (4), the upper cooperation of guide rail (12) is slidably connected slide plate (3), slide plate (3) above by two lift-bolts (1) and on nut support on top board (2); Described slide plate (3) connects Worm and worm-wheel gearing below.
3. torque coefficient of bolt measuring test-bed according to claim 1, it is characterized in that: described Worm and worm-wheel gearing comprises clutch shaft bearing (5), worm gear (6), worm screw (7), handwheel (8), the second bearing (9), described worm screw (7) is arranged on the bearing of both sides below slide plate (3) by the second bearing (9), worm gear (6) upper end be connected with a joggle with worm screw (7) is arranged in slide plate (3) centre by clutch shaft bearing (5), and described worm screw (7) one end connects handwheel (8).
4. torque coefficient of bolt measuring test-bed according to claim 1, it is characterized in that: described tested bolt connection assembly comprises bolt connected compcnent (10), pressing plate (13), tested bolt (14), described tested bolt (14) is placed in bolt connected compcnent (10), and bolt connected compcnent (10) is fixed on base plate (11) by pressing plate (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510867287.2A CN105300683A (en) | 2015-12-01 | 2015-12-01 | Bolt torque coefficient measurement testing stand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510867287.2A CN105300683A (en) | 2015-12-01 | 2015-12-01 | Bolt torque coefficient measurement testing stand |
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| CN105300683A true CN105300683A (en) | 2016-02-03 |
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| CN201510867287.2A Pending CN105300683A (en) | 2015-12-01 | 2015-12-01 | Bolt torque coefficient measurement testing stand |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289622A (en) * | 2016-10-31 | 2017-01-04 | 西安建筑科技大学 | A kind of device and method measuring high-strength bolt auxiliary connection torque coefficient |
| WO2019006720A1 (en) * | 2017-07-05 | 2019-01-10 | 深圳市樊溪电子有限公司 | Device and method for detecting rotation of stud of wind power structure |
| CN109556783A (en) * | 2018-10-16 | 2019-04-02 | 上海无线电设备研究所 | A kind of electronic equipment screw-driving torque coefficient measurement method and system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6060525A (en) * | 1983-09-14 | 1985-04-08 | Nhk Spring Co Ltd | Measuring device for torque coefficient |
| CN200947081Y (en) * | 2006-08-14 | 2007-09-12 | 上海斯巴洛克精密紧固件有限公司 | Portable digital display torque coefficient tester |
| CN201285336Y (en) * | 2008-10-14 | 2009-08-05 | 上海底特精密紧固件有限公司 | Torque coefficient test machine |
| CN201532277U (en) * | 2009-10-19 | 2010-07-21 | 浙江电力职业技术学院 | Fastener axial force-torque combination testing machine |
| CN203772474U (en) * | 2014-04-03 | 2014-08-13 | 上海工程技术大学 | High-strength bolt connection set torque coefficient detection device |
| CN204043893U (en) * | 2014-07-02 | 2014-12-24 | 郝海玲 | Simple high-strength degree torque coefficient of bolt determinator |
| CN205209755U (en) * | 2015-12-01 | 2016-05-04 | 中国船舶重工集团公司第七0四研究所 | Test bench is measured to bolt torque coefficient |
-
2015
- 2015-12-01 CN CN201510867287.2A patent/CN105300683A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6060525A (en) * | 1983-09-14 | 1985-04-08 | Nhk Spring Co Ltd | Measuring device for torque coefficient |
| CN200947081Y (en) * | 2006-08-14 | 2007-09-12 | 上海斯巴洛克精密紧固件有限公司 | Portable digital display torque coefficient tester |
| CN201285336Y (en) * | 2008-10-14 | 2009-08-05 | 上海底特精密紧固件有限公司 | Torque coefficient test machine |
| CN201532277U (en) * | 2009-10-19 | 2010-07-21 | 浙江电力职业技术学院 | Fastener axial force-torque combination testing machine |
| CN203772474U (en) * | 2014-04-03 | 2014-08-13 | 上海工程技术大学 | High-strength bolt connection set torque coefficient detection device |
| CN204043893U (en) * | 2014-07-02 | 2014-12-24 | 郝海玲 | Simple high-strength degree torque coefficient of bolt determinator |
| CN205209755U (en) * | 2015-12-01 | 2016-05-04 | 中国船舶重工集团公司第七0四研究所 | Test bench is measured to bolt torque coefficient |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289622A (en) * | 2016-10-31 | 2017-01-04 | 西安建筑科技大学 | A kind of device and method measuring high-strength bolt auxiliary connection torque coefficient |
| WO2019006720A1 (en) * | 2017-07-05 | 2019-01-10 | 深圳市樊溪电子有限公司 | Device and method for detecting rotation of stud of wind power structure |
| CN109556783A (en) * | 2018-10-16 | 2019-04-02 | 上海无线电设备研究所 | A kind of electronic equipment screw-driving torque coefficient measurement method and system |
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Application publication date: 20160203 |
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