JP2945316B2 - Bending load test method and apparatus for rod-shaped insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for testing a bending load of a rod-shaped insulator.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 7 and 8, insulators are raised and raised in the order of (a), (b), (c) and (d).
After being carried into the Amsler test site shown in FIG. 6, an insulator is attached to the bending test base (47), and an
At 0), the wire (48) was pulled to apply a predetermined bending load. In the erecting operation of the insulator, the lifting and traveling of the crane (46) are repeated in a well-balanced manner while looking at the center of gravity of the insulator (20). Stand up insulators repeatedly. If this balance is poor, the crane (46) may fall down laterally or overload. Further, since the Amsler testing machine (40) is intended for a destructive test, the whole area is covered with a wire mesh (45) so that an accident does not occur even if the destructive sample scatters. Therefore, the size of the Amsler test site is also limited, so that samples can be carried in and out of the narrow Amsler test site, and the bending test base (4
The efficiency of the work of setting in 7) is reduced. In addition, as a verification test when the insulator is damaged at a substation, the actual product is transported and transported to the Amsler test site, and a bending load test is performed. Therefore, it required a large amount of cost and days.

When a bending load is applied to the insulator, as shown in FIG. 9, a tensile load is generated at a position in a direction opposite to the load, and the tensile load decreases at a neutral point at a rate of COSθ, and the load is reduced. At the position in the direction, a compressive load results. However, as is well known, ceramics are weak to a tensile load and strong to a compressive load, so that a defect of the insulator cannot be detected unless a tensile load is applied. Therefore, the bending load resistance test of the insulator needs to be performed by changing the load direction so that each part of the insulator can be evaluated by applying a tensile load. Usually, the bending load test is performed four times per sample by rotating the test sample by 90 degrees. Therefore, in the case of the Amsler testing machine, every time the shaft is turned 90 degrees, all bolts (16) fixed to the sample table are removed and the crane (4) is removed.
Lift it in 6), rotate it 90 degrees, lower it on the sample table again, and fix it again with bolts (16). In general, the portion of the insulator in use that receives the maximum bending moment is near the bottom. Therefore, it is necessary to use the lower part of the insulator as a fulcrum and the upper part of the insulator as a load point.

[0004] In addition, as the demand for electric power has increased, the transmission voltage has been increasing, so that the overall length of the insulator has also been increased. There is also. When the bending load test of these insulators is performed using a conventional Amsler test machine, a significant modification of the Amsler test machine and the test site is required.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to eliminate the work of raising an insulator by a crane and to bend even a non-expert. Load test can be performed,
It is another object of the present invention to provide a method and an apparatus capable of performing an efficient operation.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method and an apparatus for testing the bending load of a rod-shaped insulator for solving the above-mentioned problems.
Hold the flange part at one end of the insulator that has been laid down on the support base,
A load perpendicular to the longitudinal direction of the insulator is applied to the flange at the other end, which is a free end. According to a second aspect of the present invention, each of the two insulators that are laid down is connected via respective flange metal fittings, and the connection portion is used as a fulcrum. A load perpendicular to the longitudinal direction of the insulator is applied to the portion. In a third aspect of the present invention, the two insulators that have been laid down are connected via respective flange fittings, and the respective flange portions that are not on the connection side of the two insulators are used as fulcrums. A load perpendicular to the longitudinal direction is applied. Still further, in a fourth aspect of the present invention, the two insulators that are laid down are connected via respective flange fittings, and the connecting portion and the flange at one end of the two insulators that are not on the connecting side are used as fulcrums. A load perpendicular to the longitudinal direction of the insulator is applied to the flange portion at one end of the two insulators that is not on the connection side. The loading method preferably uses a jack, and particularly preferably the jack is a hydraulic jack.
Further, it is preferable that the load is measured by using a load cell.

According to a fifth aspect of the present invention, there is provided a rod-shaped insulator bending load test apparatus, comprising: a base; a holding jig fixed to an upper center of the base; and a jig mounted on the base. And two test article mounting bases mounted on the base, wherein the jack and the test article mounting base are mounted according to the dimensions of the rod-shaped insulator. is there. According to a sixth aspect of the present invention, there is provided a base, a jack mounted on a central upper portion of the base, a support mounted on both sides of the base, and a jack mounted on the base. The support base and the test sample mounting base are mounted according to the dimensions of the rod-shaped insulator.
Preferably, the jack is a hydraulic jack, and the load measuring means is a load cell. Here, the rod-shaped insulator refers to a station post insulator, a line post insulator, and an insulator tube.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, typical embodiments of the present invention will be shown and described. 1 to 5 specifically show the bending load test method and apparatus of the present invention, respectively. FIG. 1 shows a bending load testing apparatus for one rod-shaped insulator. FIG. 2 shows a bending load test apparatus in which a connecting portion of two connected rod-shaped insulators is fixed and both free ends are used as load points.
FIG. 4 shows a bending load test device in which both ends of two connected rod-shaped insulators are fixed, and the connection portion is used as a load point. FIG.
This is a bending load test apparatus in which one end and a connection portion of two connected rod-shaped insulators are used as a fulcrum, and the other end is used as a load point.
FIG. 3 shows a holding jig (10) for fixing a connecting portion between two connected rod-shaped insulators.

FIG. 1 shows a bending load test of one rod-shaped insulator.
Will be described. The test article mounting base (6) is disposed on the center of the base (1), and the rod-shaped insulator (20) is mounted on the test article mounting base (6). The second flange fitting (25) is placed on the support (9) as shown in FIG. On the other hand, the upper (top) first flange fitting (24) is arranged on the lower push-up punch (3) of the hydraulic jack (2). Next, the lower push-up punch (3) of the hydraulic jack (2) is raised, and the rod-shaped insulator (2) is raised.
A predetermined load is applied to 0). Next, 9 rod insulators (20)
It is rotated 0 degrees and a predetermined load is again applied to the rod-shaped insulator (20). Further, the rod-shaped insulator (20) is repeatedly rotated by 90 degrees and a predetermined load is applied to the rod-shaped insulator (20) so that a predetermined load is applied from four directions of the rod-shaped insulator (20). The contact point between the support (9) and the second flange fitting (25) serves as a fulcrum, and the contact point between the lower push-up punch (3) and the first flange fitting (24) serves as a load point.

Next, a description will be given of FIG. 2 which is a bending load test apparatus in which a connecting portion of two connected rod-shaped insulators is fixed and both free ends are load points. Fig. 3 on the center of the base (1)
A holding jig (10) was provided as shown in FIG. First, a first rod-shaped insulator (2) mounted on a pallet (not shown) is used.
1) is arranged on a first specimen mounting base (7), and then a second rod-shaped insulator (22) mounted on the pallet is arranged on a second specimen mounting base (8). The first rod-shaped insulator (21) and the second rod-shaped insulator (22) are connected to each other by using the mounting holes of the first flange fittings (24) on the respective upper portions (top portions) by using the mounting holes. The connection is made by (17), and a metal wire (11) is applied to the connection part. Second flange fitting (25) below the first rod-shaped insulator (21)
Is disposed on the lower push-up punch (3) of the first hydraulic jack (4), and the lower push-up punch (3) of the second hydraulic jack (5) is mounted on the flange fitting (23) below the second rod-shaped insulator. Place on top. Raise the lower push-up punches (3) of the first and second hydraulic jacks (4, 5);
A predetermined load is applied to each rod-shaped insulator (21, 22). Therefore, the first flange metal fittings (24) of the first rod-shaped insulator (21) and the second rod-shaped insulator (22) are free ends. Next, the first rod-shaped insulator (21) and the second rod-shaped insulator (22) connected by bolts (16) and nuts (17) are rotated by 90 degrees, and a predetermined load is again applied to each rod-shaped insulator. . Further, a predetermined load is repeatedly applied to each rod-shaped insulator by rotating it by 90 degrees so that a predetermined load is applied from four directions of each rod-shaped insulator.

Next, a description will be given of FIG. 5 which is a bending load test apparatus in which a connecting portion of two connected rod-shaped insulators and one end of the two connected rod-shaped insulators are used as a fulcrum and the other end is used as a load point. I do. Only the following points are different from the case of FIG.
The flange metal fitting (24) is placed on the holding base (9) without being arranged on the lower push-up punch (3) of the first hydraulic jack (4) on the flange metal fitting (24) above the first rod-shaped insulator,
The contact point between the flange fitting (24) and the holding table (9) serves as a fulcrum. The reaction force direction at this fulcrum is the same as the load direction. Therefore, the first rod-shaped insulator and the second
The same load is applied to the rod-shaped insulator.

[0011]

【Example】

(Example) Overall length 4105 mm, upper outer diameter 215 mm, upper inner diameter 167 mm, upper wall thickness 24 mm, lower outer diameter 380
mm, a lower inner diameter of 300 mm and a lower wall thickness of 40 mm were connected to each other, and a bending load test was performed. The work is 2
Went by name. The required time was as follows. Set time of the insulator tube on the roller base: 0.8Hr, Bending load resistance time: 0.1Hr, Change time of load direction: 0.1Hr, Total: 1.0Hr x 2 persons / 2 lines. [1.0Hr / book]

(Comparative Example) The same insulator tube as in the example was subjected to a bending load test using an Amsler testing machine (40).
The work was performed by two people. Erecting time: 0.5Hr, Carrying time to the Amsler test site: 0.1Hr, Insulator tube setting time: 0.2Hr, Bending load resistance time: 0.1Hr, Load direction change time: 0.5Hr, To the Amsler test site Unloading time: 0.1 Hr, side-down time: 0.5 Hr, total: 2.0 Hr × 2 persons / line. [4.0Hr / piece]

In the case of the embodiment, the required time for the bending load test per insulator tube was 1.0 Hr / tube because two tubes could be tested simultaneously. In the comparative example, which is a conventional method, it was 4.0 Hr / line. Therefore, the efficiency is 4
That is a double improvement. Further, the facility cost of the Amsler test machine is 30 million yen, while the facility of the embodiment is 2 million yen.

[0014]

As is apparent from the above description, the method and apparatus for testing the bending load of a rod-shaped insulator according to the present invention eliminate the need to perform the work of erecting the insulator, thereby eliminating the need for a skilled crane operator. Significant reduction in man-hours. In addition, if the insulator is damaged due to a fall or collapse at a substation, etc., it is possible to easily carry out a bending load test to verify whether the insulator can be used on site, and convenience has been improved. . Further, capital investment costs can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a rod-shaped insulator bending load test apparatus of the present invention.

FIG. 2 is a front view showing another example of the bending load testing apparatus for a rod-shaped insulator according to the present invention.

FIG. 3 is an enlarged view of a portion D in FIG. 2;

FIG. 4 is a front view showing still another example of the bending load testing device for a rod-shaped insulator according to the present invention.

FIG. 5 is a front view showing still another example of the bending load testing apparatus for a rod-shaped insulator according to the present invention.

FIG. 6 is a front view of a conventional Amsler testing machine.

FIG. 7 is an explanatory view of an operation of erecting an insulator using a conventional Amsler testing machine.

FIG. 8 is an explanatory view of an operation of erecting an insulator using a conventional Amsler testing machine.

FIG. 9 is an explanatory diagram of a stress applied to the insulator and a tensile load direction.

[Explanation of symbols]

 Reference Signs List 1 base 2 hydraulic jack 3 lower push-up punch 4 first hydraulic jack 5 second hydraulic jack 6 test product mounting base 7 first test product mounting base 8 second test product mounting base 9 support base 10 Holding jig 11 Metal wire 16 Bolt 17 Nut 18 Pin 20 Rod insulator 21 First rod insulator 22 Second rod insulator 24 First flange fitting 25 Second flange fitting 40 Amsler testing machine 42 Pulley 43 Hydraulic ram 44 Wire 45 Wire net 46 Crane 47 Bending test base 48 Wire

Claims (9)

(57) [Claims] The present invention is characterized in that a flange portion at one end of a bar-shaped insulator that is laid down is held on a support base, and a load perpendicular to the longitudinal direction of the bar-shaped insulator is applied to a flange portion at another end that is a free end. Bending load test method for rod-shaped insulators. 2. The two rod-shaped insulators which have been laid down are connected via respective flange portions, and the connection portions are used as fulcrums, and each of the flange portions is a free end which is not a connection side of the two rod-shaped insulators. Applying a load perpendicular to the longitudinal direction of the rod-shaped insulator. 3. The two rod-shaped insulators which are laid down are connected via respective flanges, and the respective flanges which are not on the connecting side of the two rod-shaped insulators are fixed. A bending load test method for a rod-shaped insulator, wherein a load perpendicular to the longitudinal direction of the rod-shaped insulator is applied. 4. The two rod-shaped insulators lying down are connected via respective flange portions, and the connection portion and a flange portion on one end of the two rod-shaped insulators which are not on the connection side are used as fulcrums, and the two rod-shaped insulators are used as fulcrums. A bending load test method for a rod-shaped insulator, wherein a load perpendicular to a longitudinal direction of the rod-shaped insulator is applied to a flange portion at one end of the insulator which is not a connection side. 5. A bending load test method for a rod-shaped insulator according to claim 1, wherein said loading method uses a jack. 6. A method according to claim 5, wherein said jack is a hydraulic jack. 7. A base, a holding jig fixed to the upper center of the base, two jacks mounted on the base, and a jack mounted on the base. The bending load testing apparatus for a rod-shaped insulator, comprising two test-piece mounting bases, wherein the jack and the test-piece mounting base are mounted according to the dimensions of the rod-shaped insulator. 8. A base, a jack mounted on a central upper portion of the base, a support mounted on both sides of the base, and two tests mounted on the base. A bending load test apparatus for a rod-shaped insulator, comprising: an article mounting base, wherein the support base and the test article mounting base are mounted according to dimensions of the rod-shaped insulator. 9. A bending load test apparatus for a rod-shaped insulator according to claim 7, wherein said jack is a hydraulic jack.