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 PDFInfo
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- 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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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 147
- 239000010959 steel Substances 0.000 title claims abstract description 147
- 230000003068 static effect Effects 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 42
- 238000005259 measurement Methods 0.000 claims abstract description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 34
- 239000011701 zinc Substances 0.000 claims description 34
- 229910052725 zinc Inorganic materials 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 9
- 238000010998 test method Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 6
- 238000000691 measurement method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Abstract
本发明涉及一种铁塔镀锌角钢静摩擦系数的测量方法，试验过程分为：（1）制备试样、（2）试验步骤和（3）静摩擦系数计算；试验步骤包括①将下钢板固定在试验台上；②上钢板放在下钢板的起始线，用钢丝连接到拉伸机的上夹头；③在上钢板上加载10～100kg砝码，拉伸机以100～200mm/min速度拉动上钢板移动；④运行到减速线时，调整拉伸机运行速度至10～25mm/min；⑤运行到测量线时，调整拉伸机运行速度至0.5～1mm/min，⑥上钢板和下钢板相对滑动3～5次，取最大静摩擦力，⑦改变砝码重量，测定多次静摩擦力f s 。计算静摩擦系数μ s和平均静摩擦系数
The invention relates to a method for measuring the static friction coefficient of galvanized iron tower angle steel. The test process is divided into: (1) preparation of the sample, (2) test steps and (3) calculation of the static friction coefficient; the test steps include ① fixing the lower steel plate on the test on the platform; ② put the upper steel plate on the starting line of the lower steel plate, and connect it to the upper chuck of the stretching machine with a steel wire; ③ load 10-100kg weight on the upper steel plate, and the stretching machine pulls the upper plate at a speed of 100-200mm/min. The steel plate moves; ④ When running to the deceleration line, adjust the running speed of the stretching machine to 10-25mm/min; Slide 3 to 5 times, take the maximum static friction force, ⑦ change the weight of the weight, and measure the static friction force f s several times. Calculation of static friction coefficient μ s and average static friction coefficient
Description
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 :
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:
50～100kg counterweight is pressed in respectively on 4 block plates, keeps 24～48 hours;
test procedure:
upper steel plate (5), while running to slotted line, is adjusted drawing machine (1) travelling speed to 0.5～1mm/min,
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;
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,
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.
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Cited By (5)
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|---|---|---|---|---|
| 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 |
| CN115213497A (en) * | 2022-09-15 | 2022-10-21 | 中铝材料应用研究院有限公司 | Friction coefficient measuring device and operation method |
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Cited By (7)
| 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 |
| CN115213497A (en) * | 2022-09-15 | 2022-10-21 | 中铝材料应用研究院有限公司 | Friction coefficient measuring device and operation method |
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