CN102879161B - The anti-loosening property assessment detection method of electric power pylon securing member - Google Patents
The anti-loosening property assessment detection method of electric power pylon securing member Download PDFInfo
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- CN102879161B CN102879161B CN201210372928.3A CN201210372928A CN102879161B CN 102879161 B CN102879161 B CN 102879161B CN 201210372928 A CN201210372928 A CN 201210372928A CN 102879161 B CN102879161 B CN 102879161B
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Abstract
The invention discloses a kind of anti-loosening property assessment detection method of electric power pylon securing member, step one: confirm that securing member connects the product parameters feature of form, the model of product parameters feature and bolt and physical strength; Step 2: anti-loosening property test is carried out, step 3 to the bolt of different application occasion: the installation working condition measurement of anti-loosening property the best, common galvanized bolt is value between 0.5 ~ 0.7 times that ensures load; The application scenario that this method can connect according to shaft tower securing member and actual installation operating mode, anti-loosening property evaluation test is carried out to the shaft tower of different regions, the tight joint part setting of shaft tower different parts and the identical or similar operating condition of test of the vibrated load of reality, thus realizes the optimized Selection of shaft tower securing member and improve the efficiency and applicability of shaft tower anti-dance transformation.
Description
Technical field
The present invention relates to a kind of anti-loosening property assessment detection method of securing member.
Background technology
Transmission line galloping refers under the incentive condition of natural wind load, and a kind of low frequency that transmission pressure produces, the vibration of amplitude, mostly occur in the winter time, and along with the eccentric icing of transmission pressure, and general persistence is longer.In recent years along with the development of electrical network and the expansion of scale, transmission line galloping bar is being increase trend, and occurrence scope is comparatively wide, contains the multiple provinces and regions in China northeast, North China, Central China, East China and south China.Wave the generation of accident except causing circuit electric insulation to puncture and causing tripping operation, also may cause the accident that broken string, cross-arm are impaired, the tower etc. that falls is difficult to directly recovery, cause great threat to the safe operation of transmission line of electricity and electrical network.
By waving accident fault situation statistics several times on a large scale to the whole nation in recent years, find that the securing member loose or dislocation of electric power pylon is one of principal character of damaging of shaft tower, almost all can find a large amount of tight joint assemblies waving the shaft tower damage on-site caused at every turn.Shown by the analysis and research of electric power pylon being waved to load change in process and the anti-dance ability of shaft tower: bolt looseness causes electric power pylon to damage and the main cause of falling tower.Generally waving comparatively serious area, various forms of retainer nut more than steel tower cross-arm usually can be used locking to carry out, the different locking form financial cost of these forms differs, and anti-loosing effect difference is also very large.Even also find some for locking binding nut after the strong vibration of shaft tower waving accident investigation scene, occur that pine moves back, come off.
Also be not specifically designed to the test method of electric power pylon fastener locking Performance Detection at present, do not carry out detecting examination to the anti-loosening property of shaft tower securing member.The existing anti-loosening property about TMFC is examined, general with reference to the method described by " GB10431-2002 TMFC transverse vibration test method ".Bolt for different model is selected the amplitude of different size, under the test condition of fixing vibration frequency 12.5Hz, is carried out the transverse vibration of 1500 times, is judged the quality of fastener locking performance by the percent value remaining clamping force and initial pretightning force.Test method described in GB10431 does not consider actual feature of bearing dynamic load in the service condition that securing member connects and use procedure thereof, does not consider that the securing member connection of different intensity grades has physical strength and limits with guarantee load also mutually not equal in esse objective factor yet.
In addition, the check and evaluation method of electric power pylon fastener locking performance should be able to have feasibility under the support of prior art condition.
Summary of the invention
The object of the present invention is to provide a kind of anti-loosening property assessment detection method of transmission tower securing member, can under the support of prior art condition, have feasibility or be achieved, thus provide basic data and technical conditions for the anti-dance Anti-vibration Design of electric power pylon, in order to instruct, the manufacturing of specification shaft tower securing member, design selection and site operation.
Technical scheme of the present invention is:
The anti-loosening property assessment detection method of electric power pylon securing member, step one: confirm that securing member connects the product parameters feature of form, the model of product parameters feature and bolt and physical strength;
Step 2: anti-loosening property test is carried out to the bolt of different application occasion,
Step 3: the installation working condition measurement of anti-loosening property the best, common galvanized bolt is value between 0.5 ~ 0.7 times that ensures load;
Step 4: select evaluation profile, evaluation profile 1 is for carrying out the residue clamping force test after 3000 vibrations; Evaluation profile 2 is the vibration number test of securing member pine when turning that namely clamping force completely loses; Require that from test specimen, choose one group of fastening combined piece being not less than 10 tests, the best determined according to step 3 during test is installed operating mode and is installed, and records mounting torque and initial pretightning force simultaneously;
Step 5: it is residual clamping force or clamping force jumping degree and vibration number or time that securing member connects the main anti-loosening property evaluation index of form, the evaluation profile 1 in the corresponding step 4 of residual clamping force; Evaluation profile 2 in vibration number or time corresponding step 4;
In anti-loosening property evaluation profile 1, the dynamic clamping force curve of record test specimen, and calculate the clamping force jumping degree of securing member connection; The main anti-loosening property evaluation index of form is connected as securing member, the evaluation index being anti-loosening property stability with average clamping force jumping degree using the average residual clamping force or Mean Oscillation number of times of often organizing test specimen;
Wherein, clamping force jumping degree refers to the fluctuation in vibration test process, securing member residue clamping force real-time change curve occurred, is characterized by the dynamic clamping force difference in the vibration period.
In described step 2, anti-loosening property test is carried out to the bolt of different application occasion, comprise anti-dance, antivibration, shock resistance and other totally 4 kinds of application scenarios;
1st kind of application scenario: for the bolt of anti-dance, vibration frequency is set as 5Hz, adopt sinusoidal waveform, load is between 5 ~ 10kN;
2nd kind of application scenario: for the bolt of antivibration, vibration frequency is set as 12.5Hz, adopt sinusoidal waveform, load is between 3 ~ 5kN;
3rd kind of application scenario: for shock proof bolt, vibration frequency is set as being not more than 10Hz, adopt surge waveform, load is between 10 ~ 20kN;
4th kind of application scenario: for the bolt of other occasions, determines according to the vibrated Load Characteristics in actual application.
The invention has the beneficial effects as follows:
The application scenario that this method can connect according to shaft tower securing member and actual installation operating mode, anti-loosening property evaluation test is carried out to the shaft tower of different regions, the tight joint part setting of shaft tower different parts and the identical or similar operating condition of test of the vibrated load of reality, thus realizes the optimized Selection of shaft tower securing member and improve the efficiency and applicability of shaft tower anti-dance transformation.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
As shown in Figure 1, the enforcement of test method of the present invention is the special transverse vibration testing machine of electric power securing member based on " load is adjustable ".By selecting mode and the PLC control survey technology of hydraulic actuation, test force, position, the setting of frequency, adjustment and realization can be realized with comparalive ease, support to export the various load comprising sine wave, square wave, triangular wave, oblique wave and outside input waveform.
As shown in Figure 1, the concrete steps of appraisal procedure:
Step one: confirm that securing member connects the product parameters feature of form, the i.e. model of bolt and physical strength.
Step 2: carry out class test to the bolt of different application occasion, comprises anti-dance, antivibration, shock resistance and other totally 4 kinds of application scenarios.
1st kind of application scenario: the bolt for anti-dance carries out the adjustment of testing machine oscillating load, vibration frequency 5Hz, sinusoidal waveform, between load 5 ~ 10kN (model and intensity depending on securing member).
2nd kind of application scenario: the bolt for antivibration carries out the adjustment of testing machine oscillating load, vibration frequency 12.5Hz, sinusoidal waveform, between load 3 ~ 5kN (model and intensity depending on securing member).
3rd kind of application scenario: carry out the adjustment of testing machine oscillating load for shock proof bolt, vibration frequency is not more than 10Hz, surge waveform, between load 10 ~ 20kN (model and intensity depending on securing member).
4th kind of application scenario: the bolt for other occasions carries out the adjustment of testing machine oscillating load, determines according to the vibrated Load Characteristics in actual application.
Step 3: the installation working condition measurement of anti-loosening property the best, as without particular/special requirement, common galvanized bolt should between 0.5 ~ 0.7 times that ensures load value.
Step 4: carry out evaluation profile selection, totally 2 kinds of patterns.Evaluation profile 1 is for carrying out the residue clamping force test after 3000 vibrations; Evaluation profile 2 is the vibration number test that securing member pine turns (clamping force completely loses).Require that from test specimen, choose one group of fastening combined piece being not less than 10 tests, according to the best determined before, operating mode is installed during test and installs, record mounting torque and initial pretightning force simultaneously.
Step 5: the main anti-loosening property evaluation index that securing member connects form is residual clamping force or clamping force jumping degree (corresponding evaluation profile 1), vibration number or time (corresponding evaluation profile 2).In anti-loosening property evaluation profile 1, the dynamic clamping force curve of record test specimen, and calculate the clamping force jumping degree of securing member connection; Often to organize the main anti-loosening property evaluation index of average residual clamping force (or ' Mean Oscillation number of times ') as securing member connection form of test specimen, the evaluation index being anti-loosening property stability with average clamping force jumping degree.
Clamping force jumping degree is defined as: the fluctuation in vibration test process, securing member residue clamping force real-time change curve occurred, is characterized by the dynamic clamping force difference in the vibration period.
Claims (1)
1. the anti-loosening property assessment detection method of electric power pylon securing member, is characterized in that:
Step one: confirm that securing member connects the product parameters feature of form, the model of product parameters feature and bolt and physical strength;
Step 2: carry out anti-loosening property test to the bolt of different application occasion, comprises anti-dance, antivibration, shock resistance and other totally 4 kinds of application scenarios;
1st kind of application scenario: for the bolt of anti-dance, vibration frequency is set as 5Hz, adopt sinusoidal waveform, load is between 5 ~ 10kN;
2nd kind of application scenario: for the bolt of antivibration, vibration frequency is set as 12.5Hz, adopt sinusoidal waveform, load is between 3 ~ 5kN;
3rd kind of application scenario: for shock proof bolt, vibration frequency is set as being not more than 10Hz, adopt surge waveform, load is between 10 ~ 20kN;
4th kind of application scenario: for the bolt of other occasions, determines according to the vibrated Load Characteristics in actual application;
Step 3: the installation working condition measurement of anti-loosening property the best, common galvanized bolt is value between 0.5 ~ 0.7 times that ensures load;
Step 4: select evaluation profile, evaluation profile 1 is for carrying out the residual clamping force test after 3000 vibrations; Evaluation profile 2 is the vibration number test of securing member pine when turning that namely clamping force completely loses; Require that from test specimen, choose one group of fastening combined piece being not less than 10 tests, the best determined according to step 3 during test is installed operating mode and is installed, and records mounting torque and initial pretightning force simultaneously;
Step 5: the anti-loosening property that securing member connects embodies mainly through the change curve of clamping force with vibration number, about the change curve of clamping force, mainly contains clamping force jumping degree two key parameters in residual clamping force and change procedure; The evaluation profile 1 of corresponding step 4, residual clamping force is primary evaluation index; Vibration number is primary evaluation index by the evaluation profile 2 of corresponding step 4;
In anti-loosening property evaluation profile 1, the change curve of record clamping force of test piece, and calculate the clamping force jumping degree of securing member connection; The main anti-loosening property evaluation index of corresponding connection form using the residual clamping force mean value of one group of test specimen as securing member, using the clamping force jumping degree of this group test specimen as the evaluation index connecting form anti-loosening property stability; Corresponding anti-loosening property evaluation profile 2 is then the evaluation index using the vibration number mean value of this group test specimen as anti-loosening property;
Wherein, clamping force jumping degree refers to the fluctuation in vibration test process, securing member residual clamping force real-time change curve occurred, is characterized by the dynamic clamping force difference in the vibration period.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106528902B (en) * | 2015-09-14 | 2019-10-15 | 中国电力科学研究院 | A kind of appraisal procedure of electric power pylon double-nut bolt anti-loosening property |
| CN106289694A (en) * | 2016-09-14 | 2017-01-04 | 中国电力科学研究院 | Electric power pylon screw retention performance estimating method and device |
| CN106568562B (en) * | 2016-10-19 | 2019-08-27 | 中国电力科学研究院 | The test method and device of power transmission tower crossarm bolt anti-loosening property |
| CN108061645B (en) * | 2017-11-02 | 2020-08-18 | 宝沃汽车（中国）有限公司 | Method and apparatus for detecting fastener connection reliability |
| CN109000873B (en) * | 2018-06-07 | 2020-02-04 | 西南交通大学 | Bolt loosening life prediction method |
| CN109799053B (en) * | 2019-03-07 | 2021-05-07 | 国网浙江省电力有限公司电力科学研究院 | Power transmission equipment dynamic characteristic analysis method |
| CN112051072B (en) * | 2020-08-25 | 2022-09-06 | 中国第一汽车股份有限公司 | Finished automobile test method for looseness of chassis fastener of suspension and brake system |
| CN113435077B (en) * | 2021-05-24 | 2023-08-22 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for determining strength parameters in fastener connecting structure |
| CN113916477B (en) * | 2021-09-30 | 2023-09-29 | 东风商用车有限公司 | Anti-loosening performance test and evaluation method for bolt connection pair |
| CN114112266B (en) * | 2021-11-22 | 2023-11-24 | 广电计量检测集团股份有限公司 | Method and device for measuring anti-loosening performance of fastener assembly |
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Address after: 450052 Songshan, Zhengzhou, Henan District No. 27 South Road, No. 85 Patentee after: Electric Power Research Institute, State Grid Henan Electric Power Company Patentee after: State Power Networks Co Address before: 450008 Songshan South Road, Henan, No. 85, No. Patentee before: Henan Electric Power Corporation Electric Power Science Research Institute Patentee before: State Power Networks Co |