CN103076279A - Measuring method for static friction coefficient of galvanized angle steel of pylon - Google Patents

Measuring method for static friction coefficient of galvanized angle steel of pylon Download PDF

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Publication number
CN103076279A
CN103076279A CN2013100044876A CN201310004487A CN103076279A CN 103076279 A CN103076279 A CN 103076279A CN 2013100044876 A CN2013100044876 A CN 2013100044876A CN 201310004487 A CN201310004487 A CN 201310004487A CN 103076279 A CN103076279 A CN 103076279A
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China
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static friction
steel plate
steel
coefficient
angle steel
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CN2013100044876A
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CN103076279B (en
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柯浩
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
Hebei Electric Power Construction Adjustment Test Institute
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
Hebei Electric Power Construction Adjustment Test Institute
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Abstract

The invention relates to a measuring method for the static friction coefficient of galvanized angle steel of a pylon. The test process includes the steps of (1) preparing a sample, (2) performing testing steps and (3) calculating the static friction coefficient, wherein the testing process includes the steps as follows: (1) fixing a lower steel plate on a test bed; (2) placing an upper steel plate on a start line of the lower steel plate, and connecting to an upper chuck of a stretcher through a steel wire; (3) loading a 10-100kg weight on the upper steel plate, and enabling the stretcher to operate at a speed of 100-200mm/min and pull the upper steel plate to move; (4) regulating the operation speed of the stretcher to 10-20mm/min when the stretcher operates to a deceleration line; (5) regulating the operation speed of the stretcher to 0.5-1mm/min when the stretcher operates to a measuring line; (6) enabling the upper steel plate and the lower steel plate to slide relatively for 3-5 times, and taking the maximum static friction; and (7) changing the weight of the weight, and measuring a plurality of static friction fs; and calculating the static friction coefficient mu s and the average static friction coefficient. The measuring method achieves accurate measurement for the static friction coefficient of the galvanized angle steel of the pylon, and improves the precision and the reliability for measuring the static friction coefficient.

Description

The measuring method of steel tower Zinc-coated angle steel coefficient of static friction
Technical field
The invention belongs to the equipment performance field of measuring technique, relate to a kind of measuring method of steel tower Zinc-coated angle steel coefficient of static friction.
Technical background
The material that iron tower of power transmission line is used is mainly angle steel, and steel tower assembles and forms with bolt.Shearing force and bolt pretightening by bolt compress the tower material, realize the friction force transmission of main material power transmission to surface of contact.By applying enough large pretightning force, increase its friction force, make main material power transmission mainly rely on the friction force mode to transmit, reduce the shearing force of angle steel to bolt, avoid bolt to be sheared destruction under fatigue load and large impulsive force.Therefore need to measure the coefficient of static friction on Zinc-coated angle steel surface, judge that angle steel need to apply the size of pretightning force while relying on the power transmission of friction force mode.
The patent of invention that application number is 201110392247.9 discloses a kind of friction coefficient measurement method, " the method comprises: installation steps: two folders (2) that two test pieces (1) are respectively fixed to torsion testing machine are upper, and these two test pieces (1) are in contact with one another; Load step: by described torsion testing machine, to described two test pieces (1), load the positive pressure P perpendicular to described test piece (1), described two test pieces (1) are relatively rotated, and the moment of friction Mi between described two test pieces (1) in this rotation process of real time record; And calculation procedure: according to size, positive pressure P and the described moment of friction Mi of the surface of contact of described two test pieces (1), calculate friction co-efficient value.Therefore above-mentioned friction coefficient measurement method is easy and simple to handle, error is less." this patented technology can not be for measuring the coefficient of static friction of steel tower Zinc-coated angle steel.
Summary of the invention
The purpose of this invention is to provide a kind of measuring method of steel tower Zinc-coated angle steel coefficient of static friction, realize the stiction between the Measurement accuracy Zinc-coated angle steel, improve coefficient of static friction μ smeasuring accuracy and reliability.
The measuring method of steel tower Zinc-coated angle steel coefficient of static friction of the present invention, get the angle steel sample and tested at the test unit of steel tower Zinc-coated angle steel coefficient of static friction, and process of the test is as follows:
(1) prepare sample
1. get zinc-plated tower material angle steel 9000mm, from middle symmetry, cut open and be divided into two, one is upper steel plate, and another piece cuts into the lower steel plate of three 300mm, measures coefficient of static friction with three lower steel plates respectively;
2. remove the burr on sample, clean out greasy dirt and impurity, avoid destroying zinc coat;
3. in the optional position, middle part of lower steel plate, three lines are set, are respectively start line, deceleration line and slotted line;
4. 50~100kg counterweight is pressed on 4 block plates, keeps 24~48 hours;
(2) test procedure:
1. lower steel plate is fixed on testing table, the outside of upper steel plate upward;
2. upper steel plate outside court is placed down in to the start line position of lower steel plate, an end of steel wire is connected with upper steel plate, and the other end is connected with the upper grip of drawing machine by pulley assembly;
3. load 10~100kg counterweight on upper steel plate, it is 100~200mm/min that drawing machine arranges initial velocity, starts drawing machine and pulls upper steel plate to move, and makes upper steel plate and lower steel plate close contact;
When 4. upper steel plate runs to the deceleration line, adjust drawing machine travelling speed to 10~25mm/min;
When 5. upper steel plate runs to slotted line, adjust drawing machine travelling speed to 0.5~1mm/min;
6. make upper steel plate (5) and lower steel plate (6) relative sliding 3~5 times, getting travelling speed is the maximum static friction force under 0.5~1mm/min service condition f s ;
7. change counterweight weight, repeat above-mentioned test procedure 3.~6., be determined at the maximum static friction force under the condition of different vertical power f s ;
(3) coefficient of static friction calculates
1. press formula (1) and calculate each test maximum static friction force f s friction factor μ s :
(1)
f s : stiction, N;
G: acceleration of gravity, N/kg;
m 1: tested upper steel plate quality, kg;
m 2: counterbalance mass, kg;
μ s : coefficient of static friction,
2. calculate steel tower Zinc-coated angle steel coefficient of static friction
Steel tower Zinc-coated angle steel coefficient of static friction mean value for each friction factor.
The weight of test procedure counterweight is respectively 10.08kg, 15.16kg, 20.16kg, 25.24kg, 30.24kg, 35.32kg, 40.32kg, 45.40kg and 50.40kg.
Measure the test unit of steel tower Zinc-coated angle steel coefficient of static friction, comprise testing table, drawing machine, pulley assembly and control system, pulley assembly is comprised of support, pulley and bearing.The testing table table top is equipped with two location-plates, and location-plate is positioned at the both sides of lower steel plate.Location-plate is roller shape structure, and roller is arranged on roller bearing, and the two ends of roller bearing are fixed on upper and lower two steel bars.
The present invention utilizes the test unit of measuring steel tower Zinc-coated angle steel coefficient of static friction to measure stiction fs, cardinal principle is to change the power transmission direction of cupping machine by pulley, makes upper and lower dynamometry be converted to horizontal dynamometry, regulates the testing table of height, makes the suffered draw level of tower material.After the relative motion of zinc-plated tower material, fscan reduce, therefore the maximum, force of surveying is maximum static friction force.The weight that vertical force is tested upper steel plate adds the weight of counterweight, changes the weight of counterweight, the research coefficient of static friction μ svariation.The present invention has realized the Measurement accuracy to steel tower Zinc-coated angle steel maximum static friction force, has improved the measurement coefficient of static friction μ sprecision and reliability, for the safe operation of steel tower and electrical network is given security.
The accompanying drawing explanation
Fig. 1 is for measuring test unit and the instrumentation plan of steel tower Zinc-coated angle steel coefficient of static friction;
The sampling schematic diagram that Fig. 2 is the steel tower Zinc-coated angle steel;
Zinc-coated angle steel static friction force measurement curve map when Fig. 3 tests for loading the 25.24kg vertical force.
Wherein
1-drawing machine, 2-pulley assembly, 3-steel wire, 4-counterweight, 5-upper steel plate, 6-lower steel plate, 7-testing table, 8-inboard, 9-outside, 10-line of cut.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
The test unit of steel tower Zinc-coated angle steel coefficient of static friction, as shown in Figure 1, comprise testing table 7, drawing machine 1, pulley assembly 3 and control system, and pulley assembly is comprised of support, pulley and bearing.The table top of testing table is equipped with two location-plates, and location-plate is positioned at the both sides of lower steel plate 6.Location-plate is roller shape structure, and roller is arranged on roller bearing, and the two ends of roller bearing are fixed on upper and lower two steel bars.
Get the angle steel sample and tested at the test unit of steel tower Zinc-coated angle steel coefficient of static friction, process of the test is as follows:
(1) prepare sample
1. as shown in Figure 2, get zinc-plated tower material angle steel 9000mm, from middle symmetry, cut open and be divided into two, one is lower steel plate 6, and another piece cuts into the upper steel plate 5 of three 300mm, measures coefficient of static friction with three lower steel plates respectively; As shown in table 1, the weight of three upper steel plates is respectively 2.64,2.675 and 2.68kg;
2. for avoiding the steel plate zinc coat to come off, remove the burr on sample; Clean out greasy dirt and impurity, avoid greasy dirt and impurity to exert an influence to test findings;
3. in the optional position at the middle part of lower steel plate 6, three lines are set, are respectively start line, deceleration line and slotted line;
4. the 50.40kg counterweight is pressed on 4 block plates, keeps 48 hours, guarantee that sample is straight, reduce the impact on friction factor.
(2) test procedure:
1. lower steel plate 6 is fixed on testing table 7, the outside 9 of upper steel plate upward;
2. upper steel plate 5 outsides courts are placed down in to the start line position of lower steel plate 6, an end of steel wire is connected with upper steel plate, and the other end is connected to the upper grip of drawing machine 1 by pulley assembly;
3. load the 10.08kg counterweight on upper steel plate 5, it is 100~200mm/min that drawing machine arranges initial velocity, starts drawing machine 1 and pulls upper steel plate 5 to move, and makes upper steel plate 5 and lower steel plate 6 close contacts;
When 4. upper steel plate 5 runs to the deceleration line, adjust drawing machine 1 travelling speed to 10~25mm/min;
When 5. upper steel plate 5 runs to slotted line, adjust drawing machine 1 travelling speed to 0.5~1mm/min;
6. make upper steel plate (5) and lower steel plate (6) relative sliding 3~5 times, getting travelling speed is the maximum static friction force under 0.5~1mm/min service condition f s ;
7. 3.~6. the counterweight that is respectively 10.08kg, 15.16kg, 20.16kg, 25.24kg, 30.24kg, 35.32kg, 40.32kg, 45.40kg and 50.40kg by weight repeats above-mentioned test procedure, is determined at the maximum static friction force under the condition of different vertical power f s .
(3) coefficient of static friction calculates
1. press formula (1) and calculate each test maximum static friction force f s friction factor μ s :
(1)
f s : stiction, N;
G: acceleration of gravity, N/kg;
m 1: tested upper steel plate quality, kg;
m 2: counterbalance mass, kg;
μ s : coefficient of static friction;
2. calculate steel tower Zinc-coated angle steel coefficient of static friction
Steel tower Zinc-coated angle steel coefficient of static friction mean value for each friction factor.
Table 1 is that steel tower Zinc-coated angle steel coefficient of static friction is measured test figure, and Fig. 3 is counterweight weight in test number 2 wherein m 2 be 25.24 o'clock Zinc-coated angle steel static friction force measurement curves.
Table 1 steel tower Zinc-coated angle steel coefficient of static friction is measured test figure

Claims (4)

1. the measuring method of a steel tower Zinc-coated angle steel coefficient of static friction, get the angle steel sample and tested at the device of steel tower Zinc-coated angle steel coefficient of static friction, and process of the test is as follows:
prepare sample
get zinc-plated tower material angle steel 9000mm, from middle symmetry, cut open and be divided into two, one is upper steel plate (5), and another piece cuts into the lower steel plate (6) of three 300mm, measures coefficient of static friction with three lower steel plates respectively;
remove the burr on sample, clean out greasy dirt and impurity, avoid destroying zinc coat;
in the optional position, middle part of lower steel plate (6), three lines are set, are respectively start line, deceleration line and slotted line;
50~100kg counterweight is pressed in respectively on 4 block plates, keeps 24~48 hours;
test procedure:
lower steel plate (6) is fixed on to testing table (7) upper, the outside of lower steel plate (9) upward;
upper steel plate (5) outside, towards the start line position that is placed down in lower steel plate (6), is connected with upper steel plate with an end of steel wire, and the other end is connected with the upper grip of drawing machine (1) by pulley assembly (2);
at the upper counterweight that loads 10~100kg of upper steel plate (5), it is 100~200mm/min that drawing machine arranges initial velocity, starts drawing machine (1) and pulls upper steel plate (5) mobile, makes upper steel plate (5) and lower steel plate (6) close contact;
when upper steel plate (5) runs to the deceleration line, adjust drawing machine (1) travelling speed to 10~25mm/min;
upper steel plate (5), while running to slotted line, is adjusted drawing machine (1) travelling speed to 0.5~1mm/min,
make upper steel plate (5) and lower steel plate (6) relative sliding 3~5 times, getting travelling speed is the maximum static friction force under 0.5~1mm/min service condition f s ;
7. change counterweight weight, repeat above-mentioned test procedure ~ , be determined at the maximum static friction force under the condition of different vertical power f s;
coefficient of static friction calculates
press formula (1) and calculate each test maximum static friction force f s friction factor μ s :
(1)
f s : stiction, N;
G: acceleration of gravity, N/kg;
m 1: tested upper steel plate quality, kg;
m 2: counterbalance mass, kg;
μ s : coefficient of static friction,
calculate steel tower Zinc-coated angle steel coefficient of static friction
Steel tower Zinc-coated angle steel coefficient of static friction mean value for each friction factor.
2. the measuring method of steel tower Zinc-coated angle steel coefficient of static friction according to claim 1, it is characterized in that: in described test procedure, the quality of counterweight is respectively 10.08kg, 15.16kg, 20.16kg, 25.24kg, 30.24kg, 35.32kg, 40.32kg, 45.40kg and 50.40kg.
3. the measuring method of steel tower Zinc-coated angle steel coefficient of static friction according to claim 1, it is characterized in that: the test unit of described measurement steel tower Zinc-coated angle steel coefficient of static friction comprises testing table (7), drawing machine (1), pulley assembly (3) and control system, and described pulley assembly is comprised of support, pulley and bearing.
4. the measuring method of steel tower Zinc-coated angle steel coefficient of static friction according to claim 2, it is characterized in that: the table top of described testing table (7) is equipped with two location-plates, and described location-plate is positioned at the both sides of lower steel plate (6); Described location-plate is roller shape structure, and roller is arranged on roller bearing, and the two ends of roller bearing are fixed on upper and lower two steel bars.
CN201310004487.6A 2013-01-07 2013-01-07 The measuring method of steel tower Zinc-coated angle steel coefficient of static friction Active CN103076279B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103335942A (en) * 2013-07-08 2013-10-02 大连理工大学 Equipment and method used for measuring friction coefficient between plastic and metal mold
CN105115890A (en) * 2015-08-11 2015-12-02 江苏中天科技股份有限公司 Measuring device of friction coefficient of papilionaceous optical cable and measuring method of measuring device
CN106934179A (en) * 2017-04-10 2017-07-07 华北电力大学(保定) Transmission tower angle steel host node tension test data processing method
CN109030345A (en) * 2018-07-13 2018-12-18 中国葛洲坝集团国际工程有限公司 A kind of face-plate of rockfill dam base surface restraint stress detection method

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CN102507435A (en) * 2011-12-01 2012-06-20 中联重科股份有限公司 Friction coefficient measurement method

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CN101726457A (en) * 2008-10-31 2010-06-09 三菱麻铁里亚尔株式会社 Device and method for determining the coefficient of friction of conditioner discs
CN201917514U (en) * 2010-12-30 2011-08-03 交通运输部公路科学研究所 Clamping device for communication pipe static friction coefficient measuring instrument
CN102507435A (en) * 2011-12-01 2012-06-20 中联重科股份有限公司 Friction coefficient measurement method

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103335942A (en) * 2013-07-08 2013-10-02 大连理工大学 Equipment and method used for measuring friction coefficient between plastic and metal mold
CN105115890A (en) * 2015-08-11 2015-12-02 江苏中天科技股份有限公司 Measuring device of friction coefficient of papilionaceous optical cable and measuring method of measuring device
WO2017024619A1 (en) * 2015-08-11 2017-02-16 江苏中天科技股份有限公司 Device for measuring friction coefficient of butterfly-shaped optical cable and measurement method therefor
CN106934179A (en) * 2017-04-10 2017-07-07 华北电力大学(保定) Transmission tower angle steel host node tension test data processing method
CN106934179B (en) * 2017-04-10 2020-08-04 华北电力大学(保定) Method for processing data of main node tensile test of angle steel of power transmission tower
CN109030345A (en) * 2018-07-13 2018-12-18 中国葛洲坝集团国际工程有限公司 A kind of face-plate of rockfill dam base surface restraint stress detection method

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