CN109406298B - Composite material pole mechanical property test method and test device thereof - Google Patents
Composite material pole mechanical property test method and test device thereof Download PDFInfo
- Publication number
- CN109406298B CN109406298B CN201711348847.9A CN201711348847A CN109406298B CN 109406298 B CN109406298 B CN 109406298B CN 201711348847 A CN201711348847 A CN 201711348847A CN 109406298 B CN109406298 B CN 109406298B
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- Prior art keywords
- loading
- movable pulley
- rope
- electric pole
- pole
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- 238000012360 testing method Methods 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 238000010998 test method Methods 0.000 title abstract description 13
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims description 13
- 230000036316 preload Effects 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0037—Generation of the force using mechanical means involving a rotating movement, e.g. gearing, cam, eccentric, or centrifuge effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0264—Beam
Abstract
The invention relates to a test technology used in the mechanical property test of a composite material electric pole, in particular to a test method and a test device of the mechanical property test of the composite material electric pole, which are characterized by also comprising a bidirectional movable pulley, a steering fixed rope and two ground anchor points, wherein the bidirectional movable pulley comprises a track movable pulley and a loading movable pulley, the two movable pulleys are fixedly connected through a bracket, the two ground anchor points are respectively arranged in the outer space and the lower part of the tip end of the electric pole, the two ends of the steering fixed rope are respectively connected with the two ground anchor points, and the middle of the steering fixed rope is wound around the track movable pulley; one end of the loading rope is connected with the winch, and the other end of the loading rope is connected with the sensor after being wound around the loading movable pulley in series and finally fixedly connected with the tip end of the electric pole. When the device is operated, the pre-loading is firstly carried out, the positions of the two movable pulleys are adjusted, and smooth sliding is ensured, and then the test is carried out. The invention has the advantages that: the direction change of the loading rope can be reduced, the load simulation accuracy is improved, and the loading rope is prevented from falling off.
Description
Technical Field
The invention relates to a test technology used in the test of the mechanical properties of a composite material electric pole, in particular to a test method and a test device for the mechanical properties of the composite material electric pole.
Background
In recent years, in order to improve the safety of the power grid line, a composite material electric pole with high toughness and high specific strength is adopted in engineering. The composite material pole can reduce the collapse of the circuit pole, can also improve the corrosion resistance of the pole, can greatly reduce the construction difficulty and improve the construction efficiency, and is widely used.
When the mechanical property test is carried out on the composite material electric pole in the prior art, the mechanical property test method of the existing concrete electric pole is adopted, and referring to the attached figure 1, the device specifically comprises a winch 1, a loading rope 2, a sensor 5, a positioning device 3 and a fixed pulley 4 connected with the positioning device, and when the device is used, one end of the loading rope 2 is connected with the winch 1, the other end bypasses the fixed pulley 4, is connected with the sensor 5, and is finally connected with the tip end of the composite material electric pole. Compared with test data of a 15-meter concrete pole and a composite pole, the deflection of the corresponding tip diameter end is about 1250mm and 4000mm respectively when the load is destroyed, and the pole bending of the composite pole is obvious under the action of the maximum load. However, as the fixed pulley position of the steering loading rope is fixed, the electric pole bends towards the fixed pulley along with the further traction of the hoist to the loading rope, and the tip end of the electric pole gradually deviates from the bit line 6 where the original tip end is positioned in the bending process, so that the direction of the loading rope at one side of the tip end is also changed along with the change of the included angle a (the changing angle of the loading rope) between the bit line 6 where the original tip end of the electric pole is positioned and the loading rope, and the load simulation is inaccurate. In addition, after the tip rope hanging point moves along with the bending of the electric pole in a curve manner, the included angle between the loading rope and the pole body is increased, and along with the bending of the electric pole, the loading rope is easy to fall off from the tip rope hanging point.
Disclosure of Invention
The invention aims to provide a composite material electric pole mechanical property test method and a test device thereof, which can reduce the direction change of a loading rope, improve the load simulation accuracy and avoid the falling of the loading rope according to the defects of the prior art.
The mechanical property test device of the composite material pole is realized by the following ways:
the mechanical property test device of the composite material pole comprises a winch, a loading rope and a sensor, and is structurally characterized by further comprising a bidirectional movable pulley, a steering fixed rope and two ground anchor points, wherein the bidirectional movable pulley comprises a track movable pulley and a loading movable pulley, the two movable pulleys are fixedly connected through a bracket, the two ground anchor points are respectively arranged in the outer space and the lower part of the tip end of the pole, the two ends of the steering fixed rope are respectively connected with the two ground anchor points, and the middle of the steering fixed rope is in series winding with the track movable pulley; one end of the loading rope is connected with the winch, and the other end of the loading rope is connected with the sensor after being wound around the loading movable pulley in series and finally fixedly connected with the tip end of the electric pole.
The test method of the test device is characterized by comprising the following steps:
1) The electric pole is fixed on a test bench by adopting a fixture, and a pulley is padded in the middle of the electric pole; the windlass is arranged in the direction of the fixed point of the electric pole,
2) The loading rope on the winch passes through the loading movable pulley in the bidirectional movable pulley and is connected with the sensor, and then is connected to the rope hanging point at the tip end of the electric pole,
3) Starting the winch, pulling and tightening the loading rope to preload, wherein the tip of the electric pole is in an initial state and is not subjected to the traction force of the loading rope,
4) In the pre-loading state, the positions of the loading movable pulley and the track movable pulley are adjusted so that a loading rope connected with one side of the winch is parallel to the pole body of the electric pole, and a loading rope connected with the other side of the tip end of the electric pole is perpendicular to the pole body of the electric pole;
5) The positions of the loading movable pulley and the track movable pulley are adjusted to observe whether the bidirectional movable pulley can slide smoothly, and if the bidirectional movable pulley cannot slide smoothly, the surface treatment of the pulley or the replacement of the pulley is required;
6) Starting the winch to pull the loading rope, wherein the tip end of the electric pole gradually moves downwards to the direction of the test bed so as to bend the electric pole, the bidirectional movable pulley moves along with the tip end of the electric pole to the direction of the test bed through sliding on the loading rope and the steering fixed rope respectively,
7) And stopping the winch after the electric pole reaches the set deflection, and recording the test result.
The bidirectional movable pulley moves along with the tip of the electric pole to the direction of the test bed by sliding on the loading rope and the steering fixed rope respectively, so that the loading rope connected with one side of the tip of the electric pole almost moves in a translation way, the change angle of the loading rope is very tiny, the tip of the electric pole is tested by using a conventional test method and the test method of the invention respectively, and when the deflection of the electric pole reaches 1500mm, the change angles of the loading rope are measured by adopting the conventional test method and the test method of the invention to be 20 degrees and 3 degrees respectively, so that the test method of the invention obviously reduces the change angle of the direction of the loading rope. Therefore, the direction of the loading rope is adjusted through the self-adjusting function of the movable pulley, the problem that the direction of the loading rope is changed greatly in the loading process of the mechanical property test of the electric pole is solved, and the load simulation of the electric pole test is ensured to be more accurate; in addition, the change angle of the loading rope is small, and the loading rope is almost kept perpendicular to the electric pole, so that the loading rope is less prone to falling off, and stable and reliable test is ensured.
The invention may further be embodied as:
the included angle between the connecting line between the two ground anchor points and the direction perpendicular to the loading rope of the electric pole is 45 degrees, and the deviation is +/-20 degrees in the moving process of the bidirectional movable pulley.
In order to obtain faster and more accurate adjustment in the actual operation process, the connecting line between two ground anchor points and the vertical loading rope clamping angle are preferably 45 degrees. And further defines a distance of:
the distance between the two ground anchor points is 3-5m.
In summary, the invention provides a method and a device for testing mechanical properties of a composite material pole, which adopt a slidable bidirectional movable pulley to automatically adjust the position of a steering point of a loading steel wire rope according to the change of the tip of the composite material pole, thereby reducing the angle of the change of the direction of the loading rope in the loading process, solving the problem that the direction of the loading rope at the tip of the pole changes along with the displacement direction of the tip, ensuring that the direction of the loading rope at the tip of the pole is always unchanged or the direction change is not great, ensuring that the load simulation of the pole test is more accurate, and in addition, the angle of the change of the loading rope is small and almost kept perpendicular to the pole, so the loading rope is less prone to falling off, and ensuring the stable and reliable performance of the test.
Drawings
Fig. 1 is a schematic structural diagram of a mechanical property test process of a composite material pole according to the background art of the invention.
Fig. 2 is a schematic structural diagram of the composite pole mechanical property test device in the initial state of the pole.
Fig. 3 is a schematic structural diagram of the composite pole mechanical property test device in the test process.
The invention is further described below with reference to examples.
Detailed Description
Best mode for carrying out the invention:
referring to fig. 2, a mechanical property test device for a composite material electric pole comprises a winch 1, a loading rope 2, a sensor 5, a bidirectional movable pulley, a steering fixed rope 8 and two ground anchor points 9, wherein the bidirectional movable pulley comprises a track movable pulley 71 and a loading movable pulley 72, the two movable pulleys are fixedly connected through a bracket 73, the two ground anchor points 9 are respectively arranged in the outer space of the tip end of the electric pole and below the transverse loading rope, the distance between the two ground anchor points is 3-5m, the included angle between the connecting line between the two ground anchor points and the direction of the loading rope perpendicular to the electric pole is 45 degrees, and the deviation is +/-20 degrees in the moving process of the bidirectional movable pulley.
Two ends of the steering fixed rope 8 are respectively connected with two ground anchor points 9, and the middle of the steering fixed rope 8 is wound around the track movable pulley 71; one end of the loading rope 2 is connected with the winch 1, the other end is connected with the sensor 5 after being wound around the loading movable pulley 72 in series for steering, and finally is fixedly connected with the tip end of the electric pole.
Referring to fig. 2 and 3, the test method of the above test apparatus includes the steps of:
1) The electric pole is fixed on a test bench by adopting a fixture, and a pulley is padded in the middle of the electric pole; the windlass is arranged in the direction of the fixed point of the electric pole,
2) The loading rope on the winch passes through the loading movable pulley in the bidirectional movable pulley, is connected with the sensor after turning, and is then connected to the rope hanging point at the tip end of the electric pole,
3) Starting the winch, pulling and tightening the loading rope to preload, wherein the tip of the electric pole is in an initial state and is not subjected to the traction force of the loading rope,
4) In the pre-loading state, the positions of the loading movable pulley and the track movable pulley are adjusted so that a loading rope connected with one side of the winch is parallel to the pole body of the electric pole, and a loading rope connected with the other side of the tip end of the electric pole is perpendicular to the pole body of the electric pole;
5) The positions of the loading movable pulley and the track movable pulley are adjusted to observe whether the bidirectional movable pulley can slide smoothly, and if the bidirectional movable pulley cannot slide smoothly, the surface treatment of the pulley or the replacement of the pulley is required;
6) Starting the winch to pull the loading rope, wherein the tip end of the electric pole gradually moves downwards to the direction of the test bed so as to bend the electric pole, the bidirectional movable pulley moves along with the tip end of the electric pole to the direction of the test bed through sliding on the loading rope and the steering fixed rope respectively,
7) And stopping the winch after the electric pole reaches the set deflection, and recording the test result. The load line now has a change angle B of about 3-5 degrees.
The method and the device for testing the mechanical properties of the composite material electric pole solve the problem that the direction of the loading rope is changed greatly in the process of testing the mechanical properties of the electric pole, can ensure that the direction of the loading rope at the tip end of the electric pole is always unchanged or the direction is not changed greatly, and ensure that the load simulation of the electric pole test is more accurate.
The invention is not described in part as in the prior art.
Claims (4)
1. The mechanical property test device of the composite material pole comprises a winch, a loading rope and a sensor, and is characterized by further comprising a bidirectional movable pulley, a steering fixed rope and two ground anchor points, wherein the bidirectional movable pulley comprises a track movable pulley and a loading movable pulley, the two movable pulleys are fixedly connected through a bracket, the two ground anchor points are respectively arranged in the outer space and the lower part of the tip end of the pole, the two ends of the steering fixed rope are respectively connected with the two ground anchor points, and the middle of the steering fixed rope is in series winding with the track movable pulley; one end of the loading rope is connected with the winch, and the other end of the loading rope is connected with the sensor after being wound around the loading movable pulley in series and finally fixedly connected with the tip end of the electric pole.
2. The composite pole mechanical property test device according to claim 1, wherein an included angle between a connecting line between two ground anchor points and a direction perpendicular to a loading rope of the pole is 45 degrees, and the deviation is +/-20 degrees in a bidirectional movable pulley moving process.
3. The composite pole mechanical property test device according to claim 1, wherein the distance between the two ground anchor points is 3-5m.
4. The method for testing the mechanical properties of the composite material electric pole is characterized by comprising the following steps of:
1) Providing a composite material pole mechanical property test device as claimed in claim 1, wherein the pole is fixed on a test bench by a fixture, and a pulley is padded in the middle of the pole; the windlass is arranged in the direction of the fixed point of the electric pole,
2) The loading rope on the winch passes through the loading movable pulley in the bidirectional movable pulley and is connected with the sensor, and then is connected to the rope hanging point at the tip end of the electric pole,
3) Starting the winch, pulling and tightening the loading rope to preload, wherein the tip of the electric pole is in an initial state and is not subjected to the traction force of the loading rope,
4) In the pre-loading state, the positions of the loading movable pulley and the track movable pulley are adjusted so that a loading rope connected with one side of the winch is parallel to the pole body of the electric pole, and a loading rope connected with the other side of the tip end of the electric pole is perpendicular to the pole body of the electric pole;
5) The positions of the loading movable pulley and the track movable pulley are adjusted to observe whether the bidirectional movable pulley can slide smoothly, and if the bidirectional movable pulley cannot slide smoothly, the surface treatment of the pulley or the replacement of the pulley is required;
6) Starting the winch to pull the loading rope, wherein the tip end of the electric pole gradually moves downwards to the direction of the test bed so as to bend the electric pole, the bidirectional movable pulley moves along with the tip end of the electric pole to the direction of the test bed through sliding on the loading rope and the steering fixed rope respectively,
7) And stopping the winch after the electric pole reaches the set deflection, and recording the test result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711348847.9A CN109406298B (en) | 2017-12-15 | 2017-12-15 | Composite material pole mechanical property test method and test device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711348847.9A CN109406298B (en) | 2017-12-15 | 2017-12-15 | Composite material pole mechanical property test method and test device thereof |
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| CN109406298A CN109406298A (en) | 2019-03-01 |
| CN109406298B true CN109406298B (en) | 2023-11-10 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111044385A (en) * | 2019-12-24 | 2020-04-21 | 国际竹藤中心 | Bamboo load resistance measuring device and bamboo load resistance measuring method |
| CN112798266B (en) * | 2021-03-10 | 2022-07-01 | 安徽送变电工程有限公司 | Axial pressure detection method applied to hoisting of bearing part |
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