Cantilever load tolerance test device for casing pipe

Abstract

The utility model discloses a cantilever load tolerance test device for a bushing, and relates to the technical field of transformer bushing tolerance tests. Comprising a supporting table and supporting legs, a through groove is formed in the top of the supporting table, a fixing piece is arranged on the outer side of the through groove, and after the transformer bushing penetrates through the through groove, the transformer bushing is fixed through the fixing piece. The test device is provided with the inhaul cable and the angle adjusting piece, in the initial state, the inhaul cable coincides with the central axis of the transformer bushing to be tested, a vertical tension test is conducted on the transformer bushing to be tested, then the hydraulic cylinder is controlled to be started through the controller, and the cantilever is driven to rotate around one side of the supporting table when the hydraulic cylinder extends. According to the device, the pull rope is arranged on the to-be-tested transformer bushing, so that different pull force angles are formed between the pull rope and the to-be-tested transformer bushing, when the pull rope is perpendicular to the to-be-tested transformer bushing, a horizontal pull force test on the to-be-tested transformer bushing is realized, and the device can simulate the multi-direction pull force condition of the to-be-tested transformer bushing.

Description

Technical Field

[0001] This utility model relates to the field of transformer bushing withstand test technology, specifically a cantilever load withstand test device for bushings. Background Technology

[0002] Transformer bushings are the main insulation devices of a transformer, used to lead the high-voltage lines from inside the transformer to the outside of the tank. They not only serve as insulation to ground for the leads but also fix the leads in place, making them an important transformer accessory. Some transformer bushings contain insulating oil or compressed gas, thus requiring high sealing performance. The cantilever load withstand test applies a set tensile force to the bottom-fixed transformer bushing to check for oil or gas leaks.

[0003] Chinese utility model patent, authorized announcement number CN207717532U, discloses a cantilever load withstand test device for transformer bushings. This cantilever load withstand test device can simplify the structure of the cantilever load withstand test device for transformer bushings and improve the test efficiency.

[0004] The above solution solves the technical problems mentioned in the background art. However, in practical applications, the above solution still has certain problems. For example, the tension of the above device on the transformer bushing is a horizontal force. However, in actual operation, the bushing may be subjected to forces in different directions. Therefore, only the horizontal direction is tested, which cannot simulate multi-directional tension, resulting in inaccurate test results. Utility Model Content

[0005] The purpose of this invention is to provide a cantilever load withstand test device for casings to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cantilever load withstand test device for a bushing, comprising a support platform and support legs, wherein a through groove is provided on the top of the support platform, and a fixing member is provided on the outside of the through groove; after the transformer bushing passes through the through groove, the transformer bushing is fixed by the fixing member.

[0007] A cable is installed on the side of the support platform. One end of the cable is fixed to the test point on the top of the transformer bushing, and the other end is connected to a bearing component, on which a weight is placed.

[0008] An angle adjustment device is installed between the cable and the support platform to adjust the tension angle between the cable and the test point at the top of the transformer bushing.

[0009] Preferably, the fastener includes a side plate, a vertical plate is fixed to the opposite side of the side plate, at least one irregular groove is provided on the support platform, a pressing block is placed on the top of the support platform, at least one irregular block is fixed to the bottom end of the pressing block, and the irregular block is adapted to the irregular groove.

[0010] A lead screw is movably screwed onto the vertical plate. One end of the lead screw is movably connected to the side of the pressing block, and the other end is fixed with a connector.

[0011] Preferably, the cable and the angle adjustment component are located on opposite sides of the fixing component.

[0012] Preferably, the load-bearing component includes a connecting block fixed to the bottom end of the cable, a load-bearing plate is provided at the bottom of the connecting block, and a plurality of support ropes arranged in a circular array are fixed between the connecting block and the load-bearing plate.

[0013] Preferably, the angle adjusting component includes a cantilever that is movably connected to the support platform, and a hydraulic cylinder is provided between the cantilever and the support platform. The two sides of the hydraulic cylinder are movably connected to the cantilever and the support platform respectively through connecting shafts.

[0014] A U-shaped plate is fixed to the top of the cantilever, and pulleys are movably connected to both sides of the U-shaped plate to support the cables.

[0015] Preferably, a tension gauge is provided at the bottom of the cable.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The cantilever load withstand test device for this bushing is equipped with a cable and an angle adjustment component. In the initial state, the cable coincides with the central axis of the transformer bushing under test, enabling a vertical tensile test. Then, the hydraulic cylinder is activated by the controller. When the hydraulic cylinder extends, it drives the cantilever to rotate around one side of the support platform, thereby creating different tensile angles between the cable and the transformer bushing under test. When the cable is perpendicular to the transformer bushing under test, a horizontal tensile test is achieved. This device can simulate multi-directional tensile conditions of the transformer bushing under test, improving the accuracy of the test results. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the experimental principle of this utility model;

[0019] Figure 2 This is an axial view of the fastener of this utility model;

[0020] Figure 3 This is a top view of the present invention.

[0021] In the diagram: 1. Support platform; 101. Support leg; 2. Transformer bushing; 3. Fixing component; 301. Side plate; 302. Pressing block; 303. Irregular block; 304. Vertical plate; 305. Lead screw; 306. Connector; 4. Cable; 501. U-shaped plate; 502. Pulley; 503. Cantilever; 504. Hydraulic cylinder; 601. Connecting block; 602. Bearing plate; 603. Support rope; 7. Tension gauge. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This method applies tension in different directions to the test point at the top of the transformer bushing to determine whether the transformer bushing is qualified under the set tension magnitude.

[0024] like Figures 1-3 As shown, this utility model provides a technical solution: a cantilever load withstand test device for a bushing, including a support platform 1, a support leg 101 and a controller. The support leg 101 is fixed to the ground. A through groove is provided on the top of the support platform 1, through which the transformer bushing 2 can pass. A fixing member 3 is provided on the outside of the through groove. After the transformer bushing 2 passes through the through groove, it is fixed by the fixing member 3. The transformer bushing 2 can be lifted by a crane or a gantry crane.

[0025] like Figure 1 and Figure 2 As shown, the fixing member 3 includes a side plate 301, a vertical plate 304 fixed on the opposite side of the side plate 301, at least one irregular groove is provided on the support platform 1, a pressing block 302 is placed on the top of the support platform 1, and an irregular block 303 equal in number to the irregular groove is fixed at the bottom of the pressing block 302. The irregular block 303 is adapted to the irregular groove. In this way, under the limitation of the irregular groove, the pressing block 302 can move along the direction of the side plate 301. A screw rod 305 is movably screwed on the vertical plate 304. One end of the screw rod 305 is movably connected to the side of the pressing block 302, and the other end is fixed with a connector 306.

[0026] Specifically, a crane is used to lift the bushing 2 of the transformer to be tested and place it into the through slot. The operator uses a tool to rotate the connector 306. When the connector 306 rotates, it drives the pressure block 302 to move until the pressure block 302 and the side plate 301 clamp and fix the bushing 2 of the transformer to be tested.

[0027] A cable 4 is provided on the side of the support platform 1. One end of the cable 4 is fixed to the test point on the top of the transformer bushing 2, and the other end is connected to a bearing assembly. The bearing assembly includes a connecting block 601 fixed to the bottom of the cable 4. A bearing plate 602 is provided at the bottom of the connecting block 601. The test weight is placed on the top of the bearing plate 602. In order to maintain the stability of the bearing plate 602 when it is raised and lowered, several support ropes 603 arranged in a circular array are fixed between the connecting block 601 and the bearing plate 602. In addition, in order to display the weight of the test weight and thus obtain the magnitude of the horizontal tension applied to the test point on the top of the transformer bushing 2, a tension gauge 7 is provided at the bottom of the cable 4.

[0028] like Figure 1 As shown, an angle adjustment component is provided between the cable 4 and the support platform 1. The angle adjustment component is used to adjust the tension angle between the cable 4 and the test point at the top of the transformer bushing 2.

[0029] To facilitate operation of the device, the fixing component 3 only fixes two opposite sides of the four sides of the bushing 2 of the transformer to be tested. To prevent the bushing 2 of the transformer to be tested from sliding laterally during the tensile test, in this scheme, the cable 4 and the angle adjustment component are located on opposite sides of the fixing component 3.

[0030] The angle adjustment component includes a cantilever 503 movably connected to the support platform 1. A hydraulic cylinder 504 is provided between the cantilever 503 and the support platform 1. The two sides of the hydraulic cylinder 504 are movably connected to the cantilever 503 and the support platform 1 respectively through connecting shafts. A U-shaped plate 501 is fixed at the top of the cantilever 503. Pulleys 502 are movably connected to both sides of the U-shaped plate 501. The pulleys 502 support the cable 4. It can be understood that the purpose of setting two pulleys 502 is to detach the cable 4 from the cantilever 503 by a certain distance to prevent the cable 4 from interfering with the cantilever 503 when the cantilever 503 moves.

[0031] As a supplement to this scheme, the transformer bushing 2 to be tested is fixed by the fastener 3, and one end of the cable 4 is connected to the test point at the top of the transformer bushing 2. Then, the weight for the tensile test is placed on the bearing plate 602. In the initial state, the cable 4 is aligned with the central axis of the transformer bushing 2 to be tested, so as to realize the vertical tensile test of the transformer bushing 2 to be tested. Then, the hydraulic cylinder 504 is started by the controller. When the hydraulic cylinder 504 extends, it drives the cantilever 503 to rotate around one side of the support platform 1, so that the cable 4 and the transformer bushing 2 to be tested form different tensile angles. When the cable 4 is perpendicular to the transformer bushing 2 to be tested, the horizontal tensile test of the transformer bushing 2 to be tested is realized. A detection mechanism (not shown in the figure) is set on the transformer bushing 2 to be tested. When the transformer bushing 2 to be tested leaks at any rotation angle, the controller controls the hydraulic cylinder 504 to stop working.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A cantilever load withstand test device for a casing, comprising a support platform (1) and support legs (101), characterized in that: The top of the support platform (1) is provided with a through groove, and a fixing member (3) is provided on the outside of the through groove. After the transformer bushing (2) passes through the through groove, the transformer bushing (2) is fixed by the fixing member (3). A cable (4) is provided on the side of the support platform (1). One end of the cable (4) is fixed to the test point at the top of the transformer bushing (2), and the other end is connected to a bearing component. A heavy object is placed on the bearing component. An angle adjustment component is provided between the cable (4) and the support platform (1) to adjust the tension angle between the cable (4) and the test point at the top of the transformer bushing (2).

2. The cantilever load withstand test device for a casing according to claim 1, characterized in that: The fastener (3) includes a side plate (301), a vertical plate (304) is fixed on the opposite side of the side plate (301), at least one irregular groove is provided on the support platform (1), a pressing block (302) is placed on the top of the support platform (1), at least one irregular block (303) is fixed at the bottom of the pressing block (302), and the irregular block (303) is adapted to the irregular groove; A screw rod (305) is movably screwed onto the vertical plate (304). One end of the screw rod (305) is movably connected to the side of the pressing block (302), and the other end is fixed with a connector (306).

3. The cantilever load withstand test device for a casing according to claim 1, characterized in that: The cable (4) and the angle adjustment component are both located on opposite sides of the fixing component (3).

4. The cantilever load withstand test device for a casing according to claim 1, characterized in that: The load-bearing component includes a connecting block (601) fixed at the bottom of the cable (4), a load-bearing plate (602) is provided at the bottom of the connecting block (601), and a plurality of support ropes (603) arranged in a circular array are fixed between the connecting block (601) and the load-bearing plate (602).

5. The cantilever load withstand test device for a casing according to claim 1, characterized in that: The angle adjustment component includes a cantilever (503) movably connected to the support platform (1), and a hydraulic cylinder (504) is provided between the cantilever (503) and the support platform (1). The two sides of the hydraulic cylinder (504) are movably connected to the cantilever (503) and the support platform (1) respectively through connecting shafts. A U-shaped plate (501) is fixed at the top of the cantilever (503), and pulleys (502) are movably connected on both sides of the U-shaped plate (501) to support the cable (4).

6. The cantilever load withstand test device for a casing according to claim 1, characterized in that: A tension gauge (7) is provided at the bottom of the cable (4).

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