CN202928893U - A bending stiffness testing device - Google Patents

Abstract

The utility model provides a bending rigidity test device. The device can accurately measure the bending rigidity of the flange binding part of ultrahigh voltage electric equipment, and solves the problem on safe and stable operation of the ultrahigh voltage electric equipment caused by large theoretical calculation error. The test device comprises an anchoring system, a support system, a loading system and a measurement system, wherein the anchoring system is used for fixing an ultrahigh voltage porcelain sleeve; the support system is used for supporting the loading system; the loading system is used for applying force to the ultrahigh voltage porcelain sleeve; and the measurement system is used for measuring the relative rotation angle of the ultrahigh voltage porcelain sleeve. The bending rigidity test device provided by the utility model can accurately measure the bending rigidity of the flange binding part, measure the deformation amount of the porcelain sleeve, and detect strength of the porcelain sleeve. The test device has the advantages of high stability, low maintenance cost, simple test method and reliable result, is easy to operate, and can assure the repeatability of test data.

Description

A bending stiffness testing device

technical field

The utility model belongs to the field of test devices, in particular to a bending stiffness test device.

Background technique

The anti-seismic design code of power facilities in my country treats the flange connection as an elastic connection, and requires the bending stiffness of the flange. When the flange is glued to the porcelain casing, the bending stiffness is:

${\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="h\; c"\; filenames="HDA00001903155100023.png,HDA00001903155100051.png"\; state="\{\{state\}\}">h</figure-callout></span><figure-callout\; id="2"\; label="h\; c"\; filenames="HDA00001903155100023.png,HDA00001903155100051.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}^{\mathrm{<span\; class="notranslate">c</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; e</span>}}$

In the formula (1), d _c is the outer diameter of the cemented part of the porcelain bushing (m); h _c is the height of the cemented joint between the porcelain bushing and the flange (m); t _e is the glue between the flange and the porcelain bushing Packing thickness (m), β is the calculation coefficient of bending stiffness, and its value is β=6.54×10 ⁷ .

Although the physical concept of this formula is relatively clear, it can basically reflect the mechanical characteristics of the flange-porcelain bushing joint of high-voltage electrical equipment. And the gap distance between the flange and the porcelain bushing is very different from these parameters of ordinary high-voltage electrical equipment, resulting in a large difference between the bending stiffness of the flange glued part of UHV electrical equipment and the theoretical calculation value. In order to obtain the precise bending stiffness of the porcelain bushing-flange connection of UHV electrical equipment, it is necessary to test the bending stiffness of the flange glued parts of UHV electrical equipment. For this reason, it is necessary to develop a set that can accurately measure the porcelain bushing- Test device for the bending stiffness of the gel-like part of the flange.

Contents of the invention

The purpose of the utility model is to provide a set of test devices for testing the bending stiffness of the flange glued parts of UHV electrical equipment. Large, which brings problems to the safe and stable operation of UHV electrical equipment.

For realizing above-mentioned purpose of the invention, the technical scheme that the utility model takes is:

A bending stiffness testing device, the device includes an anchor system, a support system, a loading system and a measurement system, the improvements of which are:

The anchor system includes a trough arranged on the ground, an anchor plate placed parallel to the ground, an anchor rod and an anchor bolt for anchoring the anchor plate;

The support system includes a Π-shaped support frame and an in-line support main beam anchored to the support frame;

The loading system includes a loading bracket anchored on the supporting main beam, a steel wire rope for transmitting loading force, a weighing pan and a loading block;

The measuring system includes an electronic hanging scale connected to the steel wire rope at both ends and a dial gauge located at the glued part of the porcelain casing.

Wherein: the surface of the anchoring plate is rectangular, anchoring holes are respectively set at the four right angles of the rectangle, and the size of the anchoring hole is in interference fit with the size of the anchor rod; the lower end of the anchor rod is provided with a hammer-shaped block, so The clamping block is used in conjunction with the ground trough.

Wherein: the Π-shaped supporting frame has a left-right symmetrical structure along the central axis, and the two ends of the supporting main beam are respectively fixed on the lower surface of the supporting frame at the central axis of the Π-shaped supporting frame.

Wherein: the weighing pan and the electronic crane scale are connected by a return-shaped steel wire rope, and the steel wire rope is supported by a loading bracket; the electronic crane scale and the top of the porcelain casing are connected by a return-shaped steel wire rope.

Wherein: the steel wire rope takes the loading bracket as an inflection point, the connection section with the weighing pan is perpendicular to the ground, and the connection section with the electronic crane scale is parallel to the ground.

Wherein: the wire rope between the electronic crane scale and the top of the porcelain casing is parallel to the ground.

Wherein: the surface of the upper anchor plate and the lower anchor plate are provided with different types of holes, and the arrangement of the holes corresponds to the arrangement of the holes of the porcelain casing. The anchor plate is located at the upper part of the anchor system.

Due to the above-mentioned technical solution, compared with the prior art, the beneficial effects of the utility model include:

1) The measuring device of the utility model can accurately measure the bending stiffness of the glued part of the flange

The measuring device includes an anchoring system, a supporting system, a loading system and a measuring system, and the device can accurately measure the bending stiffness of the glued parts of the flange;

2) The measuring device can measure the deformation of the porcelain bushing and check the strength of the porcelain bushing;

3) The measuring device has high stability, can ensure the repeatability of test data, and the device has low maintenance cost and is easy to operate;

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is the overall schematic diagram of testing device;

Fig. 2 is a side view of the testing device;

Fig. 3 is a side view A-A sectional view of the testing device;

Fig. 4 is a side view B-B sectional view of the testing device;

Fig. 5 is a structural schematic diagram of an anchoring device;

Fig. 6 is a structural schematic diagram of a support system;

Fig. 7 is a schematic structural diagram of the loading system;

Fig. 8 is a schematic structural diagram of the measuring system;

Fig. 9 is a schematic diagram of the structure of the upper anchor plate;

Fig. 10 is a structural schematic diagram of the lower anchor plate;

Figure 11 is a front view of the anchor rod;

Figure 12 is a top view of the anchor rod;

Fig. 13 is an installation flowchart;

Fig. 14 is a schematic diagram of the structure of the trench;

Accompanying drawing 15 is the schematic diagram of the sectional structure of the geotrough

Reference signs:

1-upper anchor plate, 2-lower anchor plate, 3-anchor rod, 4-anchor bolt, 5-support main beam, 6-support frame, 7-loading bracket, 8-electronic crane scale, 9-loading block, 10 -Wire rope, 11-Weighing pan, 12-Dial indicator, 13-Ground trough, 14-Porcelain bushing, 15-Block.

Detailed ways

Below in conjunction with example the utility model is described in detail.

The outer diameter of the cemented part of the porcelain bushing of UHV electrical equipment, the height of the glued joint between the porcelain bushing and the flange, and the gap distance between the flange and the porcelain bushing are very different from those of ordinary high-voltage electrical equipment, resulting in UHV The bending stiffness of the glued part of the flange of electrical equipment is quite different from the theoretically calculated value. In order to measure the UHV bending stiffness, the patented UHV porcelain bushing flange connection device of the present invention, as shown in Figure 1, consists of four systems: anchoring system, support system, loading system, and measurement system. The anchoring system is used to fix the UHV porcelain bushing. The anchoring system is composed of anchoring plates 1, 2, anchor rod 3, ground groove 13 and anchoring bolt 4, as shown in the structural diagram of the anchoring device in Figure 2; the supporting system is used to support the loading system , the support system is composed of ∏-shaped support frame 6 and in-line support main beam 5, as shown in the schematic diagram of the support system structure in Figure 3; Weighing 8, loading block 9, steel wire rope 10 and weighing pan 11 are composed, and the specific structural diagram of the loading system is shown in Figure 4; the measuring system is used to measure the relative rotation angle of the UHV porcelain bushing, mainly composed of a dial indicator 12 and an electronic crane. The scale is composed of 8, as shown in the structural diagram of the measurement system in Figure 5.

Embodiment 1: the design of measuring device

The bending stiffness test device for the flange glued parts of UHV electrical equipment consists of four systems: anchoring system, support system, loading system, and measurement system.

The anchoring system is used to fix UHV porcelain bushings. The anchoring device is composed as shown in Figure 2. This system consists of an upper anchoring plate 1, a lower anchoring plate 2, a trench 13, an anchor rod 3 and an anchor bolt 4. The schematic diagram of the anchor hole distribution of the upper anchor plate 1 is shown in Figure 6, and the schematic diagram of the anchor hole distribution of the lower anchor plate 2 is shown in Figure 7. The anchor plate 1 and the anchor plate 2 have two types of anchor holes for different UHV Porcelain sleeve anchoring, that is, before anchoring, compare the anchor hole of the UHV porcelain sleeve 14 with the anchor hole of the anchor plate, and place the anchor plate with the anchor hole matched with the anchor hole of the ceramic tube 14 on the other anchor plate. Above, do the usefulness of anchoring ceramic tube 14. The surface of the anchor plates 1 and 2 is rectangular, and four Φ60 anchor holes are distributed at the four right angles of the anchor plates. The anchor holes can pass the anchor rod 3 through the upper anchor plates 1 and 2, and fix the anchor plates in the ground groove Inside. There is a hammer-shaped block 15 at the lower end of the anchor rod 3, as shown in the front view of the anchor rod in Figure 8, and the structural diagram of the trench 13 is as described in accompanying drawings 14 and 15, and accompanying drawing 14 is a top view of the trench 13, Accompanying drawing 15 is the sectional view of trench 13. The groove 13 and the shape of the anchor rod 3 are designed in cooperation. When installing, first put the short direction of the hammer-shaped block 15 of the anchor rod 3 into the groove 13, and then turn the block 15 to 90 degrees in the horizontal plane, as shown in the accompanying drawing As shown in 9, the clamping block 15 is clamped in the ground groove 13, and finally the anchor bolt 4 on the upper end of the anchor rod 3 is tightened to anchor the anchor rod 3 on the ground groove 13. The anchor holes on the anchor plates 1 and 2 are used to fix the UHV porcelain bushing 14 , and the UHV porcelain bushing 14 is anchored on the anchor plate 1 or 2 by the anchor bolt 4 .

The loading system is mainly composed of a loading bracket 7, a steel wire rope 10, a loading block 9 and a weighing pan 11; the structural diagram of the loading bracket 7 is shown in Figure 10, and the position of the loading bracket 7 can be determined according to the height of the porcelain casing to ensure that the porcelain casing The wire rope 10 between the top of the pipe 14 and the loading bracket 7 is kept parallel to the ground. The wire rope 10 between the loading bracket 7 and the weighing pan 11 is perpendicular to the ground. According to the magnitude of the loading force P required by the experiment, loading blocks 9 of different masses are put into the weighing pan 11 to provide loading forces P of different magnitudes. The effect of supporting the main beam 5 is to fix the loading bracket 7 .

The support system is used to fix the loading system. The design of the ∏-shaped support frame 6 and the support main beam 5 is shown in Figure 3. The function of the support frame 6 is to fix the support main beam 5. The Π-shaped support frame 6 is a symmetrical structure with a central axis, and a left-right symmetrical structure along the central axis; the supporting main beam 5 is a straight structure. The supporting system includes two Π-shaped supporting frames 6 arranged in parallel, and the distance between the two supporting frames 6 is less than the length of the inline supporting main beam 5 . The two ends of the support main beam 5 are respectively fixed on the inner surface of the support frame 6 at the center axis position of the support frame 6, and the support main beam 5 is anchored on the support frame 6 by the lead screw and the anchor bolt 4. When anchoring, the two ends of the lead screw Both anchor bolts 4 are used to fasten the supporting main beam 5, and the loading system is anchored to the supporting main beam 5 through the lead screw.

The measurement system consists of an electronic crane scale 8 and a dial gauge 12. The electronic crane scale 8 is used to measure the loaded weight, and the dial gauge 12 is used to measure the relative rotation angle θ of the UHV porcelain bushing. The electronic crane scale 8 is located on the steel wire rope 10 between the porcelain bushing 14 and the loading bracket 7. The specific installation method is: 1. First, put two bolts through the upper flange of the porcelain bushing and the holes of the connector and insert two The connectors are fixed, and a section of steel wire rope is passed through the center of the two connectors, and the wire rope is fixed with buckles. Then pass the middle part of the first section steel rope with one end of the second section steel rope and the other end links to each other with the hook of electronic crane scale, and the two ends of steel rope also lock with buckle. Finally, use the third section of wire rope to connect with the other end of the electronic crane scale, and connect the other end with the weighing pan, and lock both ends with buckles.

The dial indicator 12 is located at the glued place of the porcelain bushing 14, and the measurement of the corner of the porcelain sleeve flange glued place can be measured with a dial gauge. The measurement accuracy of the dial gauge is one thousandth of a millimeter, and the measurement error is ten thousand one-fifth of a millimeter.

Embodiment 2: the installation method of test device

The installation sequence of the whole test is as follows, and the specific installation flow chart is shown in Figure 11:

(1) Installation of anchoring system

Firstly, the upper and lower anchor plates 1 and 2 are anchored on the ground with the anchor rod 3 and the groove 13, and the upper and lower positions of the anchor plates 1 and 2 are determined according to the distribution of the anchor holes of the porcelain sleeve 14. The matching of the anchor holes of the porcelain sleeve 14 is the criterion; after determining the upper and lower positions of the anchor plates 1 and 2, put the short direction of the hammer-shaped block 15 of the anchor rod 3 into the ground groove 13, and then place the block 15 on the horizontal plane. Inwardly turning 90 degrees, so that the clamping block 15 is clamped in the ground groove 13, and the anchor plates are aligned in sequence with the four Φ60 anchor holes of the anchor plates on the anchor rod 3, and the anchor plates are placed in the corresponding positions parallel to the ground in turn. Finally, the anchor bolt 4 on the upper end of the anchor rod 3 is tightened to anchor the anchor plates 1, 2 and the anchor rod 3 on the trench 13. Then use the anchor bolt 4 to anchor the porcelain casing on the anchor plate. At the same time, in order to prevent the upper anchor plate 1 and the lower anchor plate 2 from moving sideways during the loading process, an iron block is used between the upper and lower anchor plates. The anchor bolt 4 tightens the anchor rod 3 so that the upper anchor plate 1 and the lower anchor plate 2 clamp the iron block. The anchoring system adopts the design mode of two anchoring plates, which can bring convenience to the operation when fixing the porcelain sleeve 14, that is, when the porcelain sleeve 14 is anchored, it can be operated through the gap between the two parallel anchoring plates. The placement position of the solid iron block avoids the anchor hole of the porcelain sleeve 14 as far as possible, so as not to cause inconvenience to the anchorage of the porcelain sleeve 14 .

The anchor plates 1 and 2 have two different types of anchor holes. The upper anchor plate 1 and the lower anchor plate 2 can exchange the upper and lower positions, and the porcelain sleeve 14 with different anchor holes can be anchored on the anchor system.

(2) Installation of support and loading system

First, anchor the supporting main beam 5 on the supporting frame 6 with screw rods and anchor bolts 4. In order to ensure the uniformity of the force on the supporting system, a vertically penetrating screw thread is provided in the middle of the supporting main beam 5. through the hole. When installing the loading system, pass the lead screw through the hole of the supporting main beam 5 and anchor the loading bracket 7 on the supporting main beam 5 with bolts.

(3) Installation of the measurement system

First the dial gauge 12 is installed on the position to be measured, and then one end of the steel wire rope 10 is connected to the top of the porcelain bushing, and the other end passes through the fixed pulley 18 and is connected to the weighing pan 10 .

The installation method of the electronic hanging scale 8 is as follows: each of the two ends of the electronic hanging scale 8 has a hook, and the two ends of the hook are connected with the steel wire rope 10 respectively, and the steel wire rope 10 at both ends is locked with a buckle.

The installation method of the dial gauge 12 is as follows: first, fix the dial gauge on the magnetic base, then push the needle of the dial gauge to the position to be measured, and finally attach the magnetic gauge to the base as shown in the figure. top plate.

The invention has been described herein in terms of specific exemplary embodiments. Appropriate substitutions or modifications will be apparent to those skilled in the art without departing from the scope of the present invention. The exemplary embodiments are illustrative only, and not limiting of the scope of the invention, which is defined by the appended claims.

Claims (7)

1. bending stiffness proving installation, described device comprises anchor system, support system, loading system and measuring system, it is characterized in that:

Described anchor system comprises the geosyncline (13) that is arranged at ground, and the anchor plate of placement parallel to the ground (1,2) is for anchor pole (3) and the anchor bolt (4) of the described anchor plate of anchoring (1,2);

Described support system comprises ∏ type support frame (6) and is anchored in the yi word pattern support girder (5) of described support frame (6);

Described loading system comprises the loading support (7) that is anchored on described support girder (5), transmits the wire rope (10) of loading force, the scale pan (11) and loading blocks (9);

Described measuring system comprises that two ends connect respectively the electronic crane scale of described wire rope (10) (8) and are positioned at the gluey clock gauge (12) of locating of porcelain bushing shell (14).

2. a kind of bending stiffness proving installation as claimed in claim 1, is characterized in that the surface of described anchor plate (1,2) is rectangle, and place, four right angles of described rectangle arranges respectively anchor hole, described anchor hole size and anchor pole (3) size interference fit; The lower end of described anchor pole (3) is provided with capitate fixture block (15), and described fixture block (15) is used in conjunction with described geosyncline (13).

3. a kind of bending stiffness proving installation as claimed in claim 1, it is characterized in that described ∏ type support frame (6) is the left-right symmetric structure along central shaft, the two ends of described support girder (5) are individually fixed in ∏ type support frame (6) central axis position support frame (6) lower surface place.

4. a kind of bending stiffness proving installation as claimed in claim 1, it is characterized in that being connected by back-shaped wire rope (10) between the described scale pan (11) and electronic crane scale (8), the wire rope (10) between the described scale pan (11) and electronic crane scale (8) is supported by loading support (7); Be connected by back-shaped wire rope (10) between described electronic crane scale (8) and porcelain bushing shell (14) top.

5. a kind of bending stiffness proving installation as described in claim 1 or 4, it is characterized in that described wire rope (10) is to load support (7) as flex point, perpendicular to ground, be parallel to ground with described electronic crane scale (8) linkage section with the described scale pan (11) linkage section.

6. a kind of bending stiffness proving installation as described in claim 1 or 4 is characterized in that the wire rope (10) between described electronic crane scale (8) and porcelain bushing shell (14) top is parallel to ground.

7. a kind of bending stiffness proving installation as claimed in claim 1, it is characterized in that the plate face of described upper anchor plate (1) and lower anchor plate (2) is provided with the hole of different types, the anchor plate that the layout in described hole is corresponding with the layout in described porcelain bushing shell (14) hole is positioned at the top of described anchor system.

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