CN111323292A - Composite cross arm structure test device and test method thereof - Google Patents
Composite cross arm structure test device and test method thereof Download PDFInfo
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- CN111323292A CN111323292A CN202010162162.0A CN202010162162A CN111323292A CN 111323292 A CN111323292 A CN 111323292A CN 202010162162 A CN202010162162 A CN 202010162162A CN 111323292 A CN111323292 A CN 111323292A
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- 238000006243 chemical reaction Methods 0.000 claims description 20
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- 150000001875 compounds Chemical class 0.000 claims description 2
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- G—PHYSICS
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- 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
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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Abstract
The invention discloses a composite cross arm structure test device, which comprises: the device comprises a first counter-force wall, a second counter-force wall, a composite cross arm, a force application piece, a load device and a hydraulic device, wherein the first counter-force wall and the second counter-force wall are arranged in parallel, the load device is used for applying vertical force to the composite cross arm, and the hydraulic device is used for applying axial load to the composite cross arm; the composite cross arm is a pyramid-shaped composite cross arm or a single-column-shaped composite cross arm; one end of the composite cross arm is fixed on the first counter-force wall, the other end of the composite cross arm is connected with the hydraulic device through the force applying part, the load device is hung on the force applying part, the hydraulic device is fixed on the second counter-force wall, a mechanical test device suitable for a pyramid-shaped composite cross arm and single-column type composite cross arm structure test can be provided, and the mechanical test device has the advantages of being simple in structure and high in practicability. The invention also discloses a test method of the composite cross arm structure test device.
Description
Technical Field
The invention relates to the technical field of mechanical test devices, in particular to a composite cross arm structure test device and a test method thereof.
Background
The traditional cross arm mechanical test device is mainly a structure test device aiming at a cross arm made of angle steel materials, a novel composite cross arm appearing in recent years has the tendency of replacing the original angle steel cross arm, the composite material has the characteristics of high strength, light weight, corrosion resistance, good durability and electrical insulation performance and the like, and is very suitable for manufacturing the cross arm, so that the composite cross arm is likely to become an important direction for the development of the power transmission line industry in the future. Therefore, a composite cross arm mechanical test device is urgently needed.
Disclosure of Invention
The embodiment of the invention provides a composite cross arm structure test device and a test method thereof, can provide a mechanical test device suitable for testing the structure of a pyramidal composite cross arm and a single-column composite cross arm, and has the characteristics of simple structure and strong practicability.
An embodiment of the present invention provides a composite cross arm structure testing apparatus, including: the device comprises a first counter-force wall, a second counter-force wall, a composite cross arm, a force application piece, a load device and a hydraulic device, wherein the first counter-force wall and the second counter-force wall are arranged in parallel, the load device is used for applying vertical force to the composite cross arm, and the hydraulic device is used for applying axial load to the composite cross arm; the composite cross arm is a pyramid-shaped composite cross arm or a single-column-shaped composite cross arm;
one end of the composite cross arm is fixed on the first reaction wall, the other end of the composite cross arm is connected with the hydraulic device through the force application piece, the load device is hung on the force application piece, and the hydraulic device is fixed on the second reaction wall.
As an improvement of the above scheme, the test device further comprises two support frames;
the support frame is fixed on the ground and respectively supports the first direction wall and the second direction wall.
As an improvement of the above scheme, the hydraulic device comprises a hydraulic cylinder, a guide rail and a guide rail connecting piece which is vertical to the guide rail;
one end of the hydraulic cylinder is connected with the stress application part, and the other end of the hydraulic cylinder is arranged on the guide rail connecting part;
the guide rail is vertically arranged on the second counter-force wall, and the guide rail connecting piece is movably fixed on the guide rail.
As an improvement of the above scheme, the test device further comprises an elongated member;
one end of the lengthening piece is connected with the hydraulic cylinder, and the other end of the lengthening piece is installed on the guide rail connecting piece.
As a modification of the above, the force applying member has a first connecting portion for connecting with the composite cross arm, a second connecting portion for connecting with the hydraulic device, a third connecting portion for suspending the load device, and a fourth connecting portion;
the third connecting part is arranged on the lower surface of the force application part, and the fourth connecting part is arranged on the upper surface of the force application part.
As an improvement of the above scheme, the test device further comprises at least two first fixing pieces and at least two second fixing pieces;
the first fixing piece and the second fixing piece are both mounted on the first reaction wall.
As an improvement of the scheme, the pyramid-shaped composite cross arm is composed of at least two pressure rods and at least two pull rods;
the pull rod, the force applying piece and the hydraulic cylinder are in the same axial direction;
one end of the pull rod is fixed on the first reaction wall through the second fixing piece, and the other end of the pull rod is connected with the first connecting part;
one end of the pressure lever is fixed on the first counter-force wall through the first fixing piece, and the other end of the pressure lever is connected with the fourth connecting part.
As an improvement of the scheme, the hydraulic cylinder is a double-acting hydraulic cylinder.
As an improvement of the scheme, a force sensor for measuring the axial load is arranged on the hydraulic device.
Compared with the prior art, the composite cross arm structure testing device disclosed by the embodiment of the invention has the following beneficial effects:
the composite cross arm is connected with the load device and the hydraulic device which are used for applying load to the composite cross arm through the arrangement of the force applying part, then the load device is arranged, force in the vertical direction is applied to the composite cross arm, the hydraulic device is arranged, the axial load is kept applied to the composite cross arm, the load applied to the composite cross arm is obtained through the load device and the hydraulic device, the stress condition of the composite cross arm in actual engineering is effectively simulated, and the mechanical property of the composite cross arm is judged. The invention provides a mechanical test device suitable for a structure test of a pyramid-shaped composite cross arm and a single-column-type composite cross arm, which can effectively solve the problem of coordinated loading of axial force and bending moment of the composite cross arm and has the characteristics of simple structure, strong practicability and high utilization rate.
The invention correspondingly provides a test method of the composite cross arm structure test device, which is suitable for the composite cross arm structure test device and comprises the following specific steps:
establishing strain gauge measuring point distribution rules of the composite cross arm structure test device, and acquiring strain data of the composite cross arm based on the strain gauge measuring point distribution rules;
acquiring deformation data and displacement data of the composite cross arm in a test process, and acquiring load data applied to the composite cross arm through a load device and a hydraulic device;
obtaining a load, strain and displacement relation graph of the composite cross arm according to the deformation data, the displacement data, the load data and the strain data;
and judging the mechanical property of the composite cross arm according to the load, strain and displacement relation diagram.
Compared with the prior art, the test method of the composite cross arm structure test device disclosed by the embodiment of the invention has the following beneficial effects:
the invention provides a data processing method corresponding to a mechanical test device suitable for a pyramid-shaped composite cross arm and a single-column composite cross arm structure test, which comprises the steps of establishing a strain gauge measuring point distribution rule of the composite cross arm structure test device, obtaining strain data of the composite cross arm based on the strain gauge measuring point distribution rule, obtaining deformation data and displacement data of the composite cross arm in a test process, obtaining load data applied to the composite cross arm through a loading device and a hydraulic device, obtaining a load, strain and displacement relation diagram of the composite cross arm according to the deformation data, the displacement data, the load data and the strain data, and judging the mechanical property of the composite cross arm according to the load, strain and displacement relation diagram.
Drawings
Fig. 1 is a schematic structural diagram of a pyramidal composite cross arm structure testing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a specific structure of a hydraulic apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a single-column composite cross arm structure testing apparatus according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a testing method of a composite cross arm structure testing apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of strain gauge point distribution of the pyramidal composite cross arm compression bar according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, which is a schematic structural diagram of a pyramidal composite cross arm structure testing apparatus provided in an embodiment of the present invention, including: the device comprises a first reaction wall 11 and a second reaction wall 12 which are arranged in parallel, a composite cross arm 3, a force application piece 4, a load device 5 for applying vertical force to the composite cross arm and a hydraulic device 6 for applying axial load to the composite cross arm; the composite cross arm 3 is a pyramid-shaped composite cross arm or a single-column-shaped composite cross arm;
one end of the composite cross arm 3 is fixed on the first reaction wall 11, the other end of the composite cross arm 3 is connected with the hydraulic device 6 through the force applying piece 4, the load device 5 is hung on the force applying piece 4, and the hydraulic device 6 is fixed on the second reaction wall 12.
In this embodiment, the load device 5 is provided, so that a vertical force is applied to the composite cross arm 3. Illustratively, the loading device 5 may be a weight box, and the control of the force of the composite cross arm 3 in the vertical direction is realized by adding or subtracting weights in the weight box, so as to obtain the force in the vertical direction through weight registration stacking. By providing the hydraulic means 6, it is maintained that an axial load, also understood as a horizontal load, is applied to the composite cross arm 3. Further, by providing the biasing member 4, the composite cross arm 3 is connected to the loading device 5 and the hydraulic device 6 for applying a load to the composite cross arm.
Preferably, a force sensor for measuring the axial load is mounted on the hydraulic device 6. By arranging the force sensor, the axial force applied to the composite cross arm is measured.
Preferably, the test device further comprises two support frames 2; the support frame 2 is fixed on the ground and supports the first direction wall 11 and the second direction wall 12 respectively.
In a preferred embodiment, referring to fig. 2, which is a specific structural schematic diagram of a hydraulic device provided in an embodiment of the present invention, the hydraulic device 6 includes a hydraulic cylinder 61, a guide rail 62, and a guide rail connecting member 63 perpendicular to the guide rail; one end of the hydraulic cylinder 61 is connected with the force application part 4, and the other end of the hydraulic cylinder 61 is installed on the guide rail connecting part 63; the guide rail 62 is vertically installed on the second reaction wall 12, and the guide rail connecting member 63 is movably fixed to the guide rail 62.
In this embodiment, the hydraulic cylinder 61 moves up and down along the guide rail through the guide rail connecting member 63 to be suitable for deformation of the composite cross arm 3, and it is ensured that a load in the horizontal direction is always applied to the composite cross arm 3. Preferably, pneumatic cylinder 61 can be double-acting pneumatic cylinder, realizes exerting pulling force and pressure to compound cross arm 3, and inside is equipped with the real-time collection system of oil pressure, can gather the oil pressure value in real time to in obtaining axial load data.
In a preferred embodiment, the composite cross arm 3 is preferably a single-column composite cross arm, and referring to fig. 3, the structural schematic diagram of a single-column composite cross arm structural test device according to an embodiment of the present invention is shown, one end of the composite cross arm 3 is directly fixed on a first reaction wall 11, the other end of the composite cross arm 3 is connected with a hydraulic device 6 through a force applying piece 4, a load device 5 is suspended on the force applying piece 4, and the hydraulic device 6 is fixed on a second reaction wall 12. The invention provides a mechanical test device suitable for a single-column type composite cross arm structure test, which is suitable for the structural test research of a single-column type composite cross arm and has the characteristics of simple structure and strong practicability.
Preferably, referring to fig. 3, the testing apparatus further includes an elongated member 7, one end of the elongated member 7 is connected to the hydraulic cylinder 61, and the other end of the elongated member 7 is mounted on the rail connecting member 63.
Preferably, referring to fig. 1, the thrust augmentation member 4 has a first connection portion 41 for connecting with the composite cross arm 3, a second connection portion 42 for connecting with the hydraulic device 6, a third connection portion 43 for suspending the load device 5, and a fourth connection portion 44; the third connecting portion 43 is disposed on the lower surface of the force applying member 4, and the fourth connecting portion 44 is disposed on the upper surface of the force applying member 4.
Preferably, referring to fig. 1, the testing device further comprises at least two first fixing members 81 and at least two second fixing members 82;
the first fixing member 81 and the second fixing member 82 are both attached to the first reaction wall 11.
In another preferred embodiment, the composite cross arm 3 is preferably a pyramid composite cross arm, which is composed of at least two pressing rods 31 and at least two pulling rods 32, see fig. 1; the pull rod 32, the force applying part 4 and the hydraulic cylinder 61 are in the same axial direction; one end of the pull rod 32 is fixed to the first reaction wall 11 by the second fixing member 82, and the other end of the pull rod 32 is connected to the first connecting portion 41; one end of the pressure lever 31 is fixed 81 to the first reaction wall 11 through the first fixing member, and the other end of the pressure lever 31 is connected to the fourth connecting portion 44.
For example, referring to fig. 1, two pressure rods 31 and two pull rods 32 are provided, two corresponding first fixing members 81 and two corresponding second fixing members 82 are provided, and the first fixing member 81 is disposed above the second fixing member 82. One end of each of the two pressing rods 31 is fixed to the first reaction wall 11 through a first fixing member 81, and the other end of each of the two pressing rods 31 is connected to the fourth connecting portion 44 of the force applying member 4. One end of each of the two pull rods 32 is fixed to the first reaction wall 11 through the second fixing member 82, and the two pull rods 32 and the hydraulic cylinder 61 are arranged in the same axial direction, so that the two pull rods keep only axial force application, and the other end of each of the two pull rods 32 is connected to the first connecting portion 41 of the force application member 4.
According to the composite cross arm structure test device provided by the embodiment of the invention, the composite cross arm, the load device and the hydraulic device which are used for applying the load to the composite cross arm are connected through the force applying piece, the load device is further arranged, the vertical force is applied to the composite cross arm, the hydraulic device is arranged, the axial load is kept applied to the composite cross arm, the load applied to the composite cross arm is obtained through the load device and the hydraulic device, the stress condition of the composite cross arm in actual engineering is effectively simulated, and the mechanical property of the composite cross arm is judged. The invention provides a mechanical test device suitable for a structure test of a pyramid-shaped composite cross arm and a single-column-type composite cross arm, which can effectively solve the problem of coordinated loading of axial force and bending moment of the composite cross arm and has the characteristics of simple structure, strong practicability and high utilization rate.
Referring to fig. 4, a schematic flow chart of a testing method of a composite cross arm structure testing apparatus according to an embodiment of the present invention is shown, where the method includes steps S101 to S104.
S101, establishing strain gauge measuring point distribution rules of the composite cross arm structure testing device, and acquiring strain data of the composite cross arm based on the strain gauge measuring point distribution rules.
Preferably, referring to fig. 5, the schematic diagram of the distribution of the strain gauge points of the pyramidal composite cross arm compression bar provided by an embodiment of the present invention is shown, where fig. 5(a) is a schematic diagram of the distribution of the strain gauge points of the compression bar, and fig. 5(b) is a schematic diagram of the cross arm cross section points of the compression bar.
Specifically, the strain gauge measuring point distribution rule is as follows:
when the composite cross arm is a pyramid-shaped composite cross arm, the strain gauges of the pressure lever are arranged at three positions, namely, the middle points (specifically, measuring points 5 to 8 and measuring points 17 to 20) in fig. 5(a) and the two end points (specifically, measuring points 1 to 4, measuring points 9 to 12, measuring points 13 to 16 and measuring points 21 to 24) in fig. 5 (a). As shown in fig. 5(b), four strain flowers are placed at each position, and the strain flowers are symmetrically arranged to test the strain distribution rule of the section. The tie rod is acted upon by axial forces only, and therefore, a strain gauge is placed at the midpoint of the tie rod.
When the composite cross arm is a single-column composite cross arm, strain gauges of the single-column composite cross arm are arranged at three positions, namely a middle point and two end points, four strain flowers are arranged at each position, and the strain flowers are symmetrically arranged to test a strain distribution rule of the section.
Therefore, on the premise of ensuring the test purpose, the measuring point positions in the strain gauge measuring point distribution rule are representative, so that the analysis and calculation are convenient, certain check points are arranged at the symmetrical parts of the structure to ensure the reliability of measured data, the arrangement of the measuring points ensures the safety and convenience of the test work, and especially when most of the measuring points at the control part are at dangerous positions, the safety measures are properly considered.
S102, acquiring deformation data and displacement data of the composite cross arm in the test process, and acquiring load data applied to the composite cross arm through a load device and a hydraulic device.
Preferably, the loading scheme adopted in this embodiment is as follows: the test load loading sequence was 0% → 20% → 40% → 60% → 80% → 85% → 90% → 95% → 100% → 105% → 110% → 115% → 120%. Further, deformation data and displacement data of the cross arm in the loading process are observed, and the stress condition of the composite cross arm is preliminarily judged.
Drawing a cross arm pull rod load-strain diagram, a cross arm press rod load-strain diagram and a hanging line point load-displacement diagram
S103, obtaining a load, strain and displacement relation graph of the composite cross arm according to the deformation data, the displacement data, the load data and the strain data.
Specifically, the relationship graph of load, strain and displacement of the composite cross arm can be a cross arm pull rod load-strain graph, a cross arm compression rod load-strain graph and a wire hanging point load-displacement graph.
And S104, judging the mechanical property of the composite cross arm according to the load, strain and displacement relation diagram.
The test method of the composite cross arm structure test device provided by the embodiment of the invention has the advantages that by establishing the strain gauge measuring point distribution rule of the composite cross arm structure test device, and acquiring strain data of the composite cross arm based on the strain gauge measuring point distribution rule, acquiring deformation data and displacement data of the composite cross arm in the test process, and load data applied to the composite cross arm is acquired through a load device and a hydraulic device, obtaining a relation graph of load, strain and displacement of the composite cross arm according to the deformation data, the displacement data, the load data and the strain data, and judging the mechanical property of the composite cross arm according to the load, strain and displacement relation diagram, and providing a data processing method corresponding to a mechanical test device suitable for the structure test of the pyramidal composite cross arm and the single-column composite cross arm.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a compound cross arm structure test device which characterized in that includes: the device comprises a first counter-force wall, a second counter-force wall, a composite cross arm, a force application piece, a load device and a hydraulic device, wherein the first counter-force wall and the second counter-force wall are arranged in parallel, the load device is used for applying vertical force to the composite cross arm, and the hydraulic device is used for applying axial load to the composite cross arm; the composite cross arm is a pyramid-shaped composite cross arm or a single-column-shaped composite cross arm;
one end of the composite cross arm is fixed on the first reaction wall, the other end of the composite cross arm is connected with the hydraulic device through the force application piece, the load device is hung on the force application piece, and the hydraulic device is fixed on the second reaction wall.
2. The composite cross arm structure testing apparatus of claim 1, further comprising two support brackets;
the support frame is fixed on the ground and respectively supports the first direction wall and the second direction wall.
3. The composite cross arm structure testing device of claim 2, wherein the hydraulic device comprises a hydraulic cylinder, a guide rail and a guide rail connecting piece perpendicular to the guide rail;
one end of the hydraulic cylinder is connected with the stress application part, and the other end of the hydraulic cylinder is arranged on the guide rail connecting part;
the guide rail is vertically arranged on the second counter-force wall, and the guide rail connecting piece is movably fixed on the guide rail.
4. The composite cross arm structure testing apparatus of claim 3, further comprising an extension;
one end of the lengthening piece is connected with the hydraulic cylinder, and the other end of the lengthening piece is installed on the guide rail connecting piece.
5. The composite cross arm structure testing device of claim 3, wherein the force applying member has a first connecting portion for connecting with the composite cross arm, a second connecting portion for connecting with the hydraulic device, a third connecting portion for suspending the load device, and a fourth connecting portion;
the third connecting part is arranged on the lower surface of the force application part, and the fourth connecting part is arranged on the upper surface of the force application part.
6. The composite cross arm structure testing apparatus of claim 5, further comprising at least two first fasteners and at least two second fasteners;
the first fixing piece and the second fixing piece are both mounted on the first reaction wall.
7. The composite cross arm structure testing apparatus of claim 6, wherein the pyramid composite cross arm is comprised of at least two compression bars and at least two tension bars;
the pull rod, the force applying piece and the hydraulic cylinder are in the same axial direction;
one end of the pull rod is fixed on the first reaction wall through the second fixing piece, and the other end of the pull rod is connected with the first connecting part;
one end of the pressure lever is fixed on the first counter-force wall through the first fixing piece, and the other end of the pressure lever is connected with the fourth connecting part.
8. A composite cross arm structure testing apparatus according to claim 3, wherein said hydraulic cylinder is a double acting hydraulic cylinder.
9. The composite cross arm structure testing apparatus of claim 1, wherein a force sensor for measuring an axial load is mounted on the hydraulic device.
10. A method for testing a composite cross arm structure testing device, which is suitable for the composite cross arm structure testing device according to any one of claims 1 to 9, and comprises the following steps:
establishing strain gauge measuring point distribution rules of the composite cross arm structure test device, and acquiring strain data of the composite cross arm based on the strain gauge measuring point distribution rules;
acquiring deformation data and displacement data of the composite cross arm in a test process, and acquiring load data applied to the composite cross arm through a load device and a hydraulic device;
obtaining a load, strain and displacement relation graph of the composite cross arm according to the deformation data, the displacement data, the load data and the strain data;
and judging the mechanical property of the composite cross arm according to the load, strain and displacement relation diagram.
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| CN202010162162.0A CN111323292A (en) | 2020-03-10 | 2020-03-10 | Composite cross arm structure test device and test method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147430A (en) * | 2020-08-18 | 2020-12-29 | 中国电力科学研究院有限公司 | Vibration fatigue test device and method for composite insulating cross arm of distribution network |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147430A (en) * | 2020-08-18 | 2020-12-29 | 中国电力科学研究院有限公司 | Vibration fatigue test device and method for composite insulating cross arm of distribution network |
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