CN111323292A - Composite cross arm structure test device and test method thereof - Google Patents

Abstract

The invention discloses a composite cross-arm structure test device, comprising: a first reaction wall and a second reaction wall placed in parallel, a composite cross-arm, a force member, which is used for applying a vertical direction to the composite cross-arm A load device for the force of One end is fixed on the first reaction force wall, the other end of the composite cross arm is connected with the hydraulic device through the forcing member, the loading device is suspended on the forcing member, and the hydraulic device It is fixed on the second reaction force wall, and can provide a mechanical test device suitable for the structural test of the pyramid-shaped composite cross arm and the single-column composite cross arm, and has the characteristics of simple structure and strong practicability. The invention also discloses a test method of the composite cross arm structure test device.

Description

A composite cross arm structure test device and its test method

technical field

The invention relates to the technical field of mechanical testing devices, in particular to a composite cross arm structure testing device and a testing method thereof.

Background technique

The traditional cross-arm mechanical test device is mainly a structural test device for angle-steel cross-arms, while the new composite cross-arms that have appeared in recent years tend to replace the original angle-steel cross-arms. The characteristics of corrosion resistance, durability and electrical insulation are very suitable for the manufacture of cross-arms, so composite cross-arms are likely to become an important direction for the development of the transmission line industry in the future. Therefore, there is an urgent need for a cross-arm mechanical test device for composite materials.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a composite cross-arm structure test device and a testing method thereof, which can provide a mechanical test device suitable for pyramid-shaped composite cross-arm and single-column composite cross-arm structural tests, with simple structure and strong practicability. Features.

An embodiment of the present invention provides a test device for a composite cross-arm structure, including: a first reaction wall and a second reaction wall placed in parallel, a composite cross-arm, and a force member, which is used to apply a vertical force to the composite cross-arm. A load device for force in a straight direction and a hydraulic device for applying an axial load to the composite cross arm; wherein the composite cross arm is a pyramid-shaped composite cross arm or a single-column composite cross arm;

One end of the composite cross-arm is fixed on the first reaction wall, and the other end of the composite cross-arm is connected with the hydraulic device through the forcing member, and the loading device is suspended on the forcing member above, the hydraulic device is fixed on the second reaction wall.

As an improvement of the above scheme, the test device further includes two support frames;

The support frame is fixed on the ground, and supports the first-direction wall and the second-direction wall respectively.

As an improvement of the above solution, the hydraulic device includes 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 to the forcing member, and the other end of the hydraulic cylinder is mounted on the guide rail connecting member;

The guide rail is vertically installed on the second reaction 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 also includes an extension piece;

One end of the extension piece is connected with the hydraulic cylinder, and the other end of the extension piece is mounted on the guide rail connecting piece.

As an improvement of the above-mentioned solution, the forcing member has a first connecting portion for connecting with the composite cross arm, a second connecting portion for connecting with the hydraulic device, and a first connecting portion for suspending the load device. three connecting parts and a fourth connecting part;

The third connecting portion is placed on the lower surface of the force-energizing member, and the fourth connecting portion is placed on the upper surface of the force-energizing member.

As an improvement of the above solution, the test device further includes at least two first fixing parts and at least two second fixing parts;

The first fixing piece and the second fixing piece are both mounted on the first reaction force wall.

As an improvement of the above solution, the pyramid-shaped composite cross arm is composed of at least two compression rods and at least two tension rods;

The tie rod, the forcing member and the hydraulic cylinder are in the same axial direction;

One end of the pull rod is fixed on the first reaction force wall by the second fixing member, and the other end of the pull rod is connected with the first connection part;

One end of the pressing rod is fixed on the first reaction force wall through the first fixing piece, and the other end of the pressing rod is connected with the fourth connecting part.

As an improvement of the above solution, the hydraulic cylinder is a double-acting hydraulic cylinder.

As an improvement of the above solution, a force sensor for measuring axial load is installed on the hydraulic device.

Compared with the prior art, a composite cross arm structure test device disclosed in the embodiment of the present invention has the following beneficial effects:

By setting a force member, the composite cross arm is connected with the load device and hydraulic device for applying a load to the composite cross arm, and then a vertical force is applied to the composite cross arm by setting the load device, and the hydraulic device is arranged to keep the The axial load is applied to the composite cross arm, so that the load applied on the composite cross arm can be obtained through the load device and the hydraulic device, which can effectively simulate the stress condition of the composite cross arm in the actual project, and realize the judgment of the mechanical properties of the composite cross arm. . The invention provides a mechanical test device suitable for the structural test of the pyramid-shaped composite cross-arm and the single-column composite cross-arm, which can effectively solve the problem of coordinated loading of the axial force and bending moment of the composite cross-arm, and has the advantages of simple structure, strong practicability and high practicability. Features of high utilization.

Another embodiment of the present invention correspondingly provides a test method for a composite cross-arm structure test device, which is applicable to the above-mentioned composite cross-arm structure test device, and the specific steps include:

Establishing a distribution rule of strain gauge measuring points 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;

Acquire the deformation data and displacement data of the composite cross arm during the test process, and obtain the load data applied on the composite cross arm through the load device and the hydraulic device;

According to the deformation data, the displacement data, the load data and the strain data, obtain the load, strain and displacement relationship diagram of the composite cross arm;

According to the load, strain and displacement relationship diagram, the mechanical properties of the composite cross arm are judged.

Compared with the prior art, the test method of a composite cross arm structure test device disclosed in the embodiment of the present invention has the following beneficial effects:

By establishing the distribution rules of the strain gauge measuring points of the composite cross arm structure test device, and obtaining the strain data of the composite cross arm based on the distribution rules of the strain gauge measuring points, the deformation data and Displacement data, and the load data applied to the composite cross arm obtained by the loading device and the hydraulic device, and the composite cross arm is obtained according to the deformation data, the displacement data, the load data and the strain data According to the load, strain and displacement relationship diagram, the mechanical properties of the composite cross arm are judged according to the load, strain and displacement relationship diagram. The data processing method corresponding to the mechanical test device of the test.

Description of drawings

1 is a schematic structural diagram of a test device for a pyramid-shaped composite cross arm structure provided by an embodiment of the present invention;

2 is a schematic diagram of a specific structure of a hydraulic device provided by an embodiment of the present invention;

3 is a schematic structural diagram of a single-column composite cross arm structure test device provided by an embodiment of the present invention;

4 is a schematic flowchart of a test method of a composite cross arm structure test device provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of the distribution of measuring points of strain gauges of a pyramid-shaped composite cross-arm compression bar according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1, it is a schematic structural diagram of a pyramid-shaped composite cross arm structure test device provided by an embodiment of the present invention, including: a first reaction wall 11 and a second reaction wall 12 placed in parallel, and a composite cross arm 3 , a force member 4, a load device 5 for applying a vertical force to the composite cross arm, and a hydraulic device 6 for applying an axial load to the composite cross arm; wherein, the composite cross arm 3 It is a pyramid-shaped composite cross arm or a single-column 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 to the hydraulic device 6 through the forcing member 4 , and the load device 5 is suspended On the forcing member 4 , the hydraulic device 6 is fixed on the second reaction wall 12 .

In this embodiment, by setting the loading device 5 , a vertical force is applied to the composite cross arm 3 . Exemplarily, the loading device 5 may be a weight box, and the force in the vertical direction of the composite cross arm 3 is controlled by adding or removing weights in the weight box, so as to obtain the force in the vertical direction through the superposition of the weights. . By providing the hydraulic device 6 , the axial load is maintained to be applied to the composite cross arm 3 , which can also be understood as applying a horizontal load to the composite cross arm 3 . Furthermore, by providing the urging member 4, the composite cross arm 3 is connected to the load device 5 and the hydraulic device 6 for applying a load to the composite cross arm.

Preferably, a force sensor for measuring axial load is installed on the hydraulic device 6 . By setting the force sensor, the axial force applied to the composite cross arm is measured.

Preferably, the test device further includes two support frames 2 ; the support frames 2 are fixed on the ground and respectively support the first direction wall 11 and the second direction wall 12 .

In a preferred embodiment, referring to FIG. 2 , which is a schematic diagram of a specific structure of a hydraulic device provided by an embodiment of the present invention, the hydraulic device 6 includes a hydraulic cylinder 61 , a guide rail 62 and a hydraulic device perpendicular to the guide rail. A guide rail connecting piece 63; one end of the hydraulic cylinder 61 is connected to the forcing member 4, and the other end of the hydraulic cylinder 61 is installed on the guide rail connecting piece 63; the guide rail 62 is vertically installed on the first On the second reaction force wall 12 , the guide rail connecting member 63 is movably fixed on the guide rail 62 .

In this embodiment, the hydraulic cylinder 61 moves up and down along the guide rail through the guide rail connecting piece 63 , so as to be suitable for the deformation of the composite cross arm 3 , so as to ensure that a horizontal load is always applied to the composite cross arm 3 . Preferably, the hydraulic cylinder 61 can be a double-acting hydraulic cylinder, which can apply tension and pressure to the composite cross arm 3, and is provided with a real-time oil pressure acquisition device, which can collect oil pressure values in real time, so as to obtain axial load data. .

In a preferred embodiment, the composite cross-arm 3 is preferably a single-column composite cross-arm, referring to FIG. 3 , which is a schematic structural diagram of a single-column composite cross-arm structure test device provided by an embodiment of the present invention , one end of the composite cross arm 3 is directly 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 forcing member 4, the loading device 5 is suspended on the forcing member 4, and the hydraulic device 6 It is fixed on the second reaction wall 12 . The invention provides a mechanical test device suitable for the structural test of the single-column composite cross arm, which is suitable for the structural test research of the single-column composite cross arm, and has the characteristics of simple structure and strong practicability.

Preferably, please refer to FIG. 3 , the test device further includes an extension piece 7 , one end of the extension piece 7 is connected to the hydraulic cylinder 61 , and the other end of the extension piece 7 is mounted on the guide rail connecting piece 63 .

Preferably, please refer to FIG. 1 , the forcing member 4 has a first connecting portion 41 for connecting with the composite cross arm 3 , a second connecting portion 42 for connecting with the hydraulic device 6 , and Suspend the third connecting part 43 and the fourth connecting part 44 of the load device 5; the third connecting part 43 is placed on the lower surface of the forcing member 4, and the fourth connecting part 44 is placed on the The upper surface of the force member 4.

Preferably, referring to FIG. 1 , the test device further includes 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 mounted on the first reaction wall 11 .

In another preferred embodiment, the composite cross-arm 3 is preferably a pyramid-type composite cross-arm, please refer to FIG. 1 , the pyramid-type composite cross-arm is composed of at least two compression rods 31 and at least two pull rods 32; the pull rod 32 is in the same axial direction as the forcing member 4 and the hydraulic cylinder 61; one end of the pull rod 32 is fixed to the first reaction wall 11 through the second fixing member 82 , the other end of the pull rod 32 is connected to the first connecting part 41; one end of the pressure rod 31 is fixed 81 on the first reaction wall 11 by the first fixing The other end of 31 is connected to the fourth connection portion 44 .

Exemplarily, please refer to FIG. 1 , there are two pressing rods 31 and two pulling rods 32 , and two corresponding first fixing members 81 and second fixing members 82 , and the first fixing member 81 is arranged on the second fixing member. 82 above. One end of the two pressing rods 31 is fixed to the first reaction wall 11 through the first fixing member 81 , and the other ends of the two pressing rods 31 are both connected to the fourth connecting portion 44 of the force applying member 4 . One end of the two tie rods 32 is fixed to the first reaction wall 11 through the second fixing member 82, and the two tie rods 32 and the hydraulic cylinder 61 are arranged in the same axial direction, so that the two tie rods only maintain the axial force. The other ends of the two tie rods 32 are both connected to the first connecting portion 41 of the forcing member 4 .

The embodiment of the present invention provides a composite cross-arm structure test device. By setting a force member, the composite cross-arm is connected to a load device and a hydraulic device for applying a load to the composite cross-arm, and then the load device is arranged to make the composite cross-arm. The cross arm exerts a force in the vertical direction, and by setting the hydraulic device, the axial load is kept on the composite cross arm, so that the load applied to the composite cross arm can be obtained through the load device and the hydraulic device, effectively simulating the actual engineering. The stress condition of the composite cross arm can be used to judge the mechanical properties of the composite cross arm. The invention provides a mechanical test device suitable for the structural test of the pyramid-shaped composite cross-arm and the single-column composite cross-arm, which can effectively solve the problem of coordinated loading of the axial force and bending moment of the composite cross-arm, and has the advantages of simple structure, strong practicability and high practicability. Features of high utilization.

Referring to FIG. 4 , it is a schematic flowchart of a testing method of a composite cross arm structure testing device provided by an embodiment of the present invention, and the method includes steps S101 to S104 .

S101 , establishing a distribution rule of measuring points of strain gauges of the composite cross-arm structure test device, and acquiring strain data of the composite cross-arm based on the distribution rules of measuring points of strain gauges.

Preferably, referring to FIG. 5 , it is a schematic diagram of the distribution of the measuring points of the strain gauges of the pyramid-shaped composite cross-arm compression bar provided by an embodiment of the present invention, wherein FIG. 5( a ) is a schematic diagram of the distribution of the measuring points of the strain gauges of the compression bar, Figure 5(b) is a schematic diagram of the cross-section measuring point of the compression rod.

Specifically, the distribution rules of the strain gauge measuring points are as follows:

When the composite cross-arm is a pyramid-shaped composite cross-arm, the strain gauges of the compression bar are arranged at the midpoint (specifically measuring points 5 to 8 and 17 to 20 in Fig. 5(a)) and at both ends (specifically It is the three positions of 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 rosettes are placed at each position, and the rosettes are arranged symmetrically to test the strain distribution law of the section. The tie rod only acts on the axial force, so a strain gauge can be arranged at the midpoint of the tie rod.

When the composite cross-arm is a single-column composite cross-arm, the strain gauges of the single-column composite cross-arm are arranged at three positions at the midpoint and the two end points, and four rosettes are placed at each position. Test the strain distribution law of the section.

Therefore, under the premise of ensuring the purpose of the test, the position of the measuring points in the distribution rules of the strain gauge measuring points is representative, which is convenient for analysis and calculation, and certain check points should be arranged in the symmetrical parts of the structure to ensure the reliability of the measured data. The arrangement of the measuring points should ensure the safety and convenience of the test work, especially when most of the measuring points in the control part are in relatively dangerous positions, safety measures should be properly considered.

S102. Acquire deformation data and displacement data of the composite cross arm during the test process, and obtain load data applied to the composite cross arm through a loading device and a hydraulic device.

Preferably, the loading scheme adopted in this embodiment is as follows: the loading sequence of the test load is 0%→20%→40%→60%→80%→85%→90%→95%→100%→105%→110%→115 %→120%. Further, observe the deformation data and displacement data of the cross-arm during the loading process, and preliminarily judge the stress of the composite cross-arm.

Draw cross-arm tie-rod load-strain diagram, cross-arm tie-rod load-strain diagram and hanging line point load-displacement diagram

S103. Obtain a load, strain, and displacement relationship diagram of the composite cross arm according to the deformation data, the displacement data, the load data, and the strain data.

Specifically, the load, strain and displacement relationship diagram of the composite cross arm may be a cross arm tie-rod load-strain diagram, a cross-arm compression rod load-strain diagram, and a hooking point load-displacement diagram.

S104, according to the load, strain and displacement relationship diagram, determine the mechanical properties of the composite cross arm.

The embodiment of the present invention provides a test method for a composite cross-arm structure test device, by establishing a distribution rule of strain gauge measurement points of the composite cross-arm structure test device, and obtaining a composite cross-arm based on the strain gauge measurement point distribution rule. obtain the deformation data and displacement data of the composite cross arm during the test process, and obtain the load data applied to the composite cross arm through the load device and hydraulic device, according to the deformation data, the displacement data data, the load data and the strain data, the load, strain and displacement relationship diagram of the composite cross arm is obtained, and the mechanical properties of the composite cross arm are judged according to the load, strain and displacement relationship diagram, the present invention The data processing method corresponding to the mechanical test device suitable for the structural test of the pyramid-shaped composite cross-arm and the single-column composite cross-arm is provided.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made, and these improvements and modifications may also be regarded as It is the protection scope of the present invention.

Claims (10)

1. a composite cross arm structure test device, is characterized in that, comprises: the first reaction wall and the second reaction wall placed in parallel, composite cross arm, force member, for applying vertical to described composite cross arm A load device for force in a straight direction and a hydraulic device for applying an axial load to the composite cross arm; wherein the composite cross arm is a pyramid-shaped composite cross arm or a single-column composite cross arm; One end of the composite cross-arm is fixed on the first reaction wall, and the other end of the composite cross-arm is connected with the hydraulic device through the forcing member, and the loading device is suspended on the forcing member above, the hydraulic device is fixed on the second reaction wall. 2. composite cross arm structure test device as claimed in claim 1, is characterized in that, described test device also comprises two support frames; The support frame is fixed on the ground, and supports the first-direction wall and the second-direction wall respectively. 3. The composite cross arm structure test device according to 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 to the forcing member, and the other end of the hydraulic cylinder is mounted on the guide rail connecting member; The guide rail is vertically installed on the second reaction force wall, and the guide rail connecting piece is movably fixed on the guide rail. 4. The composite cross arm structure test device as claimed in claim 3, wherein the test device further comprises an extension piece; One end of the extension piece is connected with the hydraulic cylinder, and the other end of the extension piece is mounted on the guide rail connecting piece. 5 . The composite cross arm structure test device according to claim 3 , wherein the forcing member has a first connecting part for connecting with the composite cross arm, a first connecting part for connecting with the hydraulic device a second connection part, a third connection part for suspending the load device, and a fourth connection part; The third connecting portion is placed on the lower surface of the force-energizing member, and the fourth connecting portion is placed on the upper surface of the force-energizing member. 6. The composite cross arm structure test device according to claim 5, wherein the test device further comprises at least two first fixing parts and at least two second fixing parts; The first fixing piece and the second fixing piece are both mounted on the first reaction force wall. 7. The composite cross-arm structure test device according to claim 6, wherein the pyramid-shaped composite cross-arm is composed of at least two compression rods and at least two tension rods; The tie rod, the forcing member and the hydraulic cylinder are in the same axial direction; One end of the pull rod is fixed on the first reaction force wall by the second fixing member, and the other end of the pull rod is connected with the first connection part; One end of the pressing rod is fixed on the first reaction force wall through the first fixed piece, and the other end of the pressing rod is connected with the fourth connecting part. 8 . The composite cross arm structure test device according to claim 3 , wherein the hydraulic cylinder is a double-acting hydraulic cylinder. 9 . 9 . The composite cross arm structure test device according to claim 1 , wherein a force sensor for measuring axial load is installed on the hydraulic device. 10 . 10. A test method for a composite cross-arm structure test device, characterized in that it is applicable to the composite cross-arm structure test device as claimed in any one of claims 1 to 9, and the specific steps include: Establishing a distribution rule of strain gauge measuring points 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; Acquire the deformation data and displacement data of the composite cross arm during the test process, and obtain the load data applied on the composite cross arm through the load device and the hydraulic device; According to the deformation data, the displacement data, the load data and the strain data, obtain the load, strain and displacement relationship diagram of the composite cross arm; According to the load, strain and displacement relationship diagram, the mechanical properties of the composite cross arm are judged.

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