A cantilever load test device for 10kV ring main unit outgoing line bushing

Abstract

The application relates to a cantilever load test device for a 10kV ring network cabinet outgoing line bushing, which comprises a bearing frame, a load applying mechanism and a restraint mechanism. Corresponding installation ports for installing the outgoing line bushing are arranged on the two sides of the bearing frame. Adjustable fixing mechanisms are arranged at the installation ports, which are used for adapting the outgoing line bushings of different sizes and locking the outgoing line bushings in the bearing frame. The load applying mechanism is used for applying incremental load in the cantilever direction to the outgoing line bushing fixed in the bearing frame. The restraint mechanism is installed on the bearing frame and is linked with the load applying mechanism, which is used for restraining the load applying mechanism when the outgoing line bushing is overloaded and deformed or is broken, so as to prevent the load applying mechanism from falling out of control. The application can adapt to outgoing line bushings of different sizes, accurately simulate the cantilever stress state of the outgoing line bushings under actual working conditions, and prevent the load applying mechanism from falling out of control when the bushing has problems.

Description

Technical Field

[0001] This application relates to the technical field of load testing of outgoing bushings of ring main units, and in particular to a cantilever load testing device for outgoing bushings of 10kV ring main units. Background Technology

[0002] The bushing is a key component of a 10kV ring main unit. Its function is to lead the high-voltage conductor out of a sealed gas-filled enclosure while ensuring insulation and sealing of the enclosure. In actual operation, the portion of the bushing extending outside the enclosure needs to be connected to power cables. These cables have significant weight and rigidity, and under environmental factors such as wind, snow, or short-circuit electrodynamic forces, they will generate a continuous downward torque on the end of the bushing, i.e., a cantilever load. If the mechanical strength of the bushing is insufficient, under this load for a long period of time, it may lead to: 1) Bushing root fracture, causing a short circuit to ground in the high-voltage conductor, resulting in a major power outage; 2) Failure of the sealing structure, leading to gas leakage in the ring main unit's gas box, a decrease in internal insulation strength, and ultimately insulation breakdown.

[0003] In previous cantilever load tests of outgoing bushings, relatively simple methods were typically used. A common approach is to directly suspend a weight on the outgoing bushing to simulate the load. This method is relatively simple and inexpensive. However, due to the simplicity of the suspension method, it is difficult to accurately control the load increase process, and it cannot accurately simulate the gradually increasing cantilever force experienced by the outgoing bushing under actual operating conditions. Furthermore, there is a lack of appropriate protective measures in case of overload deformation or breakage of the outgoing bushing. Directly suspending a weight not only fails to accurately simulate the cantilever stress state of the outgoing bushing under actual operating conditions, making it difficult to accurately assess its performance, but also poses serious safety hazards.

[0004] In response to the aforementioned technical issues, a cantilever load test device for the outgoing bushing of a 10kV ring main unit is proposed to solve these problems. Utility Model Content

[0005] To address the aforementioned technical issues, this application provides a cantilever load testing device for the outgoing bushing of a 10kV ring main unit.

[0006] This application provides a cantilever load testing device for outgoing bushings of 10kV ring main units, which adopts the following technical solution: A cantilever load testing device for outgoing bushings of 10kV ring main units, comprising: The support frame has mounting openings on both sides for installing the outgoing sleeves. The mounting openings are equipped with adjustable fixing mechanisms to adapt to outgoing sleeves of different sizes and lock them in the support frame. A load application mechanism is used to apply an increasing load in the cantilever direction to the outgoing bushing fixed in the bearing frame. It includes a force-bearing ring sleeved on the free end of the outgoing bushing, a pressure plate fixedly connected to the lower part of the force-bearing ring, and several weights for applying a vertical load. The pressure plate has at least one vertical guide post at its bottom. The weights can be stacked along the guide post, and the load is transferred to the outgoing bushing via the pressure plate and the force-bearing ring through the weight of the weights, simulating the cantilever stress state under actual working conditions. The restraint mechanism, installed on the bearing frame, works in conjunction with the load application mechanism to restrain the load application mechanism and prevent it from falling out of control when the outgoing bushing undergoes overload deformation or breakage.

[0007] By adopting the above technical solution, the adjustable fixing mechanism at the mounting openings on both sides of the bearing frame can be adjusted according to different sizes of the outlet sleeve. Using components such as the combination plate and limit sleeve, the outlet sleeve is securely locked in the bearing frame, ensuring stable installation of outlet sleeves of different specifications and improving the versatility and applicability of the device. The load application mechanism, through a force ring fitted on the free end of the outlet sleeve, a pressure plate connected to it, and weights that can be stacked along the guide column, uses the weight of the weights to transfer the vertical load to the outlet sleeve via the pressure plate and force ring. This accurately applies an increasing load in the cantilever direction to the outlet sleeve, thus realistically simulating the cantilever stress state of the outlet sleeve under actual working conditions, providing a reliable basis for accurately testing the performance of the outlet sleeve. The constraint mechanism is installed on the bearing frame and linked to the load application mechanism. When the outlet sleeve undergoes overload deformation or breaks, the constraint mechanism uses connecting ropes and other components to constrain the force ring, preventing the load application mechanism from falling out of control, ensuring the safety of the test process, and avoiding personnel injury and equipment damage caused by the falling load application mechanism.

[0008] Optionally, the constraint mechanism includes a support block fixedly connected to the top of the bearing frame, support columns symmetrically arranged on the side of the support block, a multi-section rod rotatably connected to the support column, and a constraint block disposed at the tail end of the multi-section rod. A connecting rope is fixedly connected to the constraint block, and the connecting rope is connected to the upper end face of the force-bearing ring to constrain the force-bearing ring.

[0009] By adopting the above technical solution, the support block of the constraint mechanism is fixed to the top of the bearing frame, providing stable support for the entire constraint mechanism; the support columns symmetrically arranged on the side of the support block provide rotation connection points for the multi-section rod, allowing the multi-section rod to rotate flexibly; the connecting rope fixedly connected to the constraint block at the tail end of the multi-section rod is connected to the upper end face of the force ring; when the outlet sleeve undergoes overload deformation or breakage, the force ring will tend to fall. At this time, the connecting rope will tighten, and the tension of the force ring will be transferred to the support block and the bearing frame through the multi-section rod, thereby constraining the force ring, preventing the load application mechanism from falling out of control, ensuring the safety of the test process, and avoiding equipment damage or personal injury caused by the fall of the load application mechanism.

[0010] Optionally, the multi-section rod includes at least two rods, and the mating surface between the at least two rods is provided with an elastic element for buffering the distance change of the multi-section rod, which serves as a buffer constraint when the force ring falls.

[0011] By adopting the above technical solution, when the force ring falls, the distance of the multi-section rods will change due to the force. At this time, the elastic element set on the mating surface between the rods will play a role. The elastic element can absorb and disperse the impact force generated by the falling force ring through its own elastic deformation, and play a buffering role on the distance change of the multi-section rods. This achieves buffering constraint when the force ring falls, and avoids damage to the test device or safety problems caused by the large impact force generated by the direct fall of the force ring.

[0012] Optionally, the fixing mechanism includes a combination plate that is bolted to the bearing frame. The combination plate has a limiting hole that is adapted to the size of the outlet sleeve. The outlet sleeve passes through the limiting hole and is engaged in the limiting hole.

[0013] By adopting the above technical solution, the fixing mechanism uses a combination plate that is bolted to the load-bearing frame. The combination plate has a limiting hole that is adapted to the size of the outlet sleeve. This design allows the combination plate to be flexibly spliced ​​and adjusted according to outlet sleeves of different sizes. The outlet sleeve passes through the limiting hole and is locked in it. The bolt splicing method ensures the stability of the combination plate, while the limiting hole is precisely adapted to the size of the outlet sleeve, which can effectively prevent the outlet sleeve from shaking or displacing during the test, thereby ensuring that the outlet sleeve is reliably locked in the load-bearing frame and providing a stable foundation for the subsequent cantilever load test.

[0014] Optionally, the fixing mechanism further includes a limiting sleeve for limiting the outlet sleeve at the assembly plate. The limiting sleeve is fastened to the outside of the outlet sleeve on the inner side of the bearing frame, and the limiting sleeve is fixedly connected to the assembly plate by bolts.

[0015] By adopting the above technical solution, this connection method can further enhance the limiting effect of the outlet sleeve at the combined plate; specifically, the bolt connection provides a stable and reliable fixing force, so that the limiting sleeve fits tightly against the outlet sleeve, preventing excessive shaking and displacement of the outlet sleeve during the test; it can better adapt to outlet sleeves of different sizes, ensuring that the outlet sleeve is firmly locked in the load-bearing frame, thereby improving the fixing stability of the outlet sleeve of the entire test device and ensuring the accuracy and safety of the test process.

[0016] Optionally, it also includes a detection mechanism for detecting deformation or breakage of the outlet bushing. The detection mechanism includes a detection frame fixedly connected to the side of the support frame and a detector for detecting the outlet bushing. A mounting frame is oscillating on the detection frame, and the detector is mounted on the mounting frame and oscillates with the mounting frame.

[0017] By adopting the above technical solution, the testing mechanism is used to detect the deformation or fracture of the bushing. The testing frame is fixedly connected to the side of the bearing frame, providing a stable mounting base for the detector. The mounting frame is swayed on the testing frame, and the detector is mounted on the mounting frame and can swing with it. In this way, the detector can flexibly adjust the testing angle and position according to the actual state of the bushing, thereby enabling more comprehensive and accurate detection of the deformation or fracture of the bushing during the cantilever load test, timely acquisition of the bushing's status information, and improvement of the accuracy and reliability of the testing.

[0018] Optionally, an adjusting cylinder is fixedly connected to both sides of the bearing frame and below the outlet sleeve. A correction ring is sleeved on the outside of the pressure plate. The adjusting cylinder and the correction ring are in the same axial direction. An adjusting rod is provided at the output end of the adjusting cylinder. The adjusting rod is connected to the outside of the correction ring.

[0019] By adopting the above technical solution, during the process of applying an increasing load in the cantilever direction to the outlet bushing, the outlet bushing may experience a certain degree of displacement or tilt, resulting in uneven stress and affecting the accuracy of the test results. At this time, the adjusting cylinder is activated, and the output end of the adjusting cylinder drives the adjusting rod to move. Since the adjusting rod is connected to the correction ring, the movement of the adjusting rod will cause the correction ring to apply a force to the pressure plate, thereby adjusting the position of the pressure plate and correcting the displacement or tilt of the outlet bushing. This ensures that the outlet bushing is subjected to uniform stress during the test, improving the accuracy and reliability of the cantilever load test.

[0020] Optionally, a support bracket is provided at the bottom of the support frame, and reinforcing plates are fixedly connected to all four sides of the support bracket. A base is fixedly connected to the bottom of the support bracket and corresponding to the bottom of the reinforcing plates.

[0021] By adopting the above technical solution, the reinforcing plate can enhance the structural strength of the support bracket, disperse the pressure borne by the support bracket, reduce stress concentration, and make the support bracket more stable and less prone to deformation or damage. The base is fixedly connected to the bottom of the support bracket and the bottom of the reinforcing plate. The base increases the contact area between the device and the ground, further improving the stability of the device and preventing the device from shaking, tilting or even collapsing during the test due to external forces or its own weight, ensuring that the test can be carried out safely and stably.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The load application mechanism can apply load smoothly and incrementally through the force ring, pressure plate and weights stacked along the guide column, which highly restores the cantilever stress state in actual working conditions and overcomes the shortcomings of traditional methods that are difficult to accurately simulate load increment. 2. The restraint mechanism, through the buffer linkage of multi-section rods, elastic elements, and connecting ropes, can effectively bear and buffer the falling load when the casing breaks, preventing uncontrolled falls and ensuring the safety of personnel and equipment. The testing mechanism can monitor casing deformation or breakage in real time, further improving the controllability and safety of the test; 3. The adjusting cylinder, in conjunction with the correction ring, allows for real-time adjustment of the force direction, ensuring uniform force distribution and improving test accuracy. The load-bearing bracket, reinforcing plate, and base together enhance the overall structural stability and load-bearing capacity, ensuring smooth test execution. Attached Figure Description

[0023] Figure 1 This is a three-dimensional view of a cantilever load test device for a 10kV ring main unit outgoing bushing, as described in this application.

[0024] Figure 2 This is a front view of a cantilever load test device for a 10kV ring main unit outgoing bushing, as described in this application.

[0025] Figure 3 This is a cross-sectional view of the load-bearing frame of a cantilever load test device for a 10kV ring main unit outgoing bushing, as described in this application.

[0026] Figure 4 yes Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0027] Figure 5 These are three-dimensional views of Embodiment 2 and Embodiment 3 of a cantilever load testing device for a 10kV ring main unit outgoing bushing in this application.

[0028] Figure 6 yes Figure 5 Side view.

[0029] In the diagram: 1. Bearing frame; 11. Mounting port; 12. Fixing mechanism; 121. Combination plate; 122. Limiting hole; 123. Limiting sleeve; 13. Adjusting cylinder; 14. Adjusting rod; 15. Bearing bracket; 16. Reinforcing plate; 17. Base; 2. Load application mechanism; 21. Force ring; 22. Pressure plate; 23. Weight; 24. Guide column; 3. Constraint mechanism; 31. Support block; 32. Support column; 33. Multi-section rod; 34. Constraint block; 35. Connecting rope; 36. Elastic element; 4. Outlet sleeve; 5. Detection mechanism; 51. Detection frame; 52. Detector; 53. Mounting frame; 54. Swing motor; 6. Correction ring. Detailed Implementation

[0030] The following is in conjunction with the accompanying drawings. Figures 1-6 This application will be described in further detail.

[0031] Example 1 refer to Figures 1-4 This application discloses a cantilever load test device for a 10kV ring main unit outgoing bushing, comprising: a load-bearing frame 1, a load application mechanism 2, and a constraint mechanism 3.

[0032] The support frame 1 has mounting openings 11 on both sides for installing the outgoing sleeve 4. The mounting openings 11 are equipped with adjustable fixing mechanisms 12 to adapt to outgoing sleeves 4 of different sizes and lock them in the support frame 1. The load application mechanism 2 is used to apply an increasing load in the cantilever direction to the outgoing sleeve 4 fixed in the support frame 1. It includes a force ring 21 sleeved on the free end of the outgoing sleeve 4, a pressure plate 22 fixedly connected to the lower part of the force ring 21, and several weights 23 for applying vertical load. The pressure plate 22 has at least one vertical guide post 24 at its bottom. The weights 23 can be stacked along the guide post 24 and the load is transferred to the outgoing sleeve 4 through the pressure plate 22 and the force ring 21 by the weight of the weights 23, simulating the cantilever force state under actual working conditions. The constraint mechanism 3 is installed on the support frame 1 and works in conjunction with the load application mechanism 2. It is used to constrain the load application mechanism 2 to prevent it from falling out of control when the outgoing sleeve 4 undergoes overload deformation or breakage.

[0033] The adjustable fixing mechanism 12 at the mounting openings 11 on both sides of the bearing frame 1 can be adjusted according to different sizes of the outlet sleeve 4. Using components such as the combination plate 121 and the limiting sleeve 123, the outlet sleeve 4 is securely locked in the bearing frame 1, ensuring stable installation of outlet sleeves 4 of different specifications and improving the versatility and applicability of the device. The load application mechanism 2, through the force ring 21 fitted on the free end of the outlet sleeve 4, the pressure plate 22 connected thereto, and the weights 23 that can be stacked along the guide column 24, uses the weight of the weights 23 to transfer the vertical load through the pressure plate 22 and the force ring 21 to the load application mechanism 2. The outlet sleeve 4 can accurately apply an increasing load in the cantilever direction to the outlet sleeve 4, thereby realistically simulating the cantilever stress state of the outlet sleeve 4 under actual working conditions, providing a reliable basis for accurately testing the performance of the outlet sleeve 4; the constraint mechanism 3 is installed on the bearing frame 1 and linked with the load application mechanism 2. When the outlet sleeve 4 undergoes overload deformation or breakage, the constraint mechanism 3 constrains the force ring 21 through components such as the connecting rope 35, preventing the load application mechanism 2 from falling out of control, ensuring the safety of the test process, and avoiding personnel injury and equipment damage caused by the fall of the load application mechanism 2.

[0034] In this embodiment, more specifically, the constraint mechanism 3 includes a support block 31 fixedly connected to the top of the bearing frame 1, support columns 32 symmetrically arranged on the sides of the support block 31, a multi-section rod 33 rotatably connected to the support column 32, and a constraint block 34 disposed at the tail end of the multi-section rod 33. A connecting rope 35 is fixedly connected to the constraint block 34, and the connecting rope 35 is connected to the upper end face of the force ring 21 to constrain the force ring 21. The support block 31 of the constraint mechanism 3 is fixed to the top of the bearing frame 1, providing stable support for the entire constraint mechanism 3; the support columns 32 symmetrically arranged on the sides of the support block 31 are multi-section rods. The rod 33 provides a rotating connection point, allowing the multi-section rod 33 to rotate flexibly. The connecting rope 35, which is fixedly connected to the constraint block 34 at the tail end of the multi-section rod 33, is connected to the upper end face of the force ring 21. When the outlet sleeve 4 undergoes overload deformation or breaks, the force ring 21 will tend to fall. At this time, the connecting rope 35 will be tightened, and the tension of the force ring 21 will be transmitted to the support block 31 and the bearing frame 1 through the multi-section rod 33, thereby constraining the force ring 21, preventing the load application mechanism 2 from falling out of control, ensuring the safety of the test process, and avoiding equipment damage or personal injury caused by the fall of the load application mechanism 2.

[0035] In this embodiment, more specifically, the multi-section rod 33 includes at least two rods, and the mating surface between the at least two rods is provided with an elastic element 36 for buffering the distance change of the multi-section rod 33. The elastic element 36 is a spring, which is used for buffering constraint when the force ring 21 falls. When the force ring 21 falls, the multi-section rod 33 will change distance due to the force. At this time, the elastic element 36 provided on the mating surface between the rods will play a role. The elastic element 36 can absorb and disperse the impact force generated by the falling force ring 21 through its own elastic deformation, and play a buffering role on the distance change of the multi-section rod 33, thereby achieving buffering constraint when the force ring 21 falls, avoiding damage to the test device or safety problems caused by the large impact force generated by the direct fall of the force ring 21.

[0036] In this embodiment, more specifically, the fixing mechanism 12 includes a combination plate 121 bolted to the bearing frame 1. The combination plate 121 has a limiting hole 122 that fits the size of the outlet sleeve 4. The outlet sleeve 4 passes through the limiting hole 122 and is locked in the limiting hole 122. The fixing mechanism 12 uses a combination plate 121 bolted to the bearing frame 1. The combination plate 121 has a limiting hole 122 that fits the size of the outlet sleeve 4. This design allows the combination plate 121 to be flexibly spliced ​​and adjusted according to outlet sleeves 4 of different sizes. The outlet sleeve 4 passes through the limiting hole 122 and is locked in it. The bolt splicing method ensures the stability of the combination plate 121. The limiting hole 122 precisely fits the size of the outlet sleeve 4, which can effectively prevent the outlet sleeve 4 from shaking or displacing during the test, thereby ensuring that the outlet sleeve 4 is reliably locked in the bearing frame 1, providing a stable foundation for the subsequent cantilever load test.

[0037] In this embodiment, more specifically, the fixing mechanism 12 also includes a limiting sleeve 123 for limiting the outlet sleeve 4 at the combination plate 121. The limiting sleeve 123 is fastened to the outside of the outlet sleeve 4 on the inner side of the support frame 1. The limiting sleeve 123 and the combination plate 121 are fixedly connected by bolts. This connection method can further enhance the limiting effect of the outlet sleeve 4 at the combination plate 121. Specifically, the bolt connection provides a stable and reliable fixing force, so that the limiting sleeve 123 fits tightly against the outlet sleeve 4, preventing the outlet sleeve 4 from shaking and displacing too much during the test. It can better adapt to outlet sleeves 4 of different sizes, ensuring that the outlet sleeve 4 is firmly locked in the support frame 1, thereby improving the fixing stability of the outlet sleeve 4 of the entire test device and ensuring the accuracy and safety of the test process.

[0038] In this embodiment, more specifically, a support bracket 15 is provided at the bottom of the support frame 1. Reinforcing plates 16 are fixedly connected to all four sides of the support bracket 15. A base 17 is fixedly connected to the bottom of the support bracket 15 and corresponding to the bottom of the reinforcing plates 16. The reinforcing plates 16 can enhance the structural strength of the support bracket 15, disperse the pressure borne by the support bracket 15, reduce stress concentration, and make the support bracket 15 more stable and less prone to deformation or damage. The base 17 is fixedly connected to the bottom of the support bracket 15 and corresponding to the bottom of the reinforcing plates 16. The base 17 increases the contact area between the device and the ground, further improving the stability of the device and preventing the device from shaking, tilting, or even collapsing during the test due to external forces or its own weight, ensuring that the test can be carried out safely and stably.

[0039] The implementation principle of the cantilever load test device for 10kV ring main unit outgoing bushings in this embodiment is as follows: the fixing mechanism 12 of the bearing frame 1 can adapt to outgoing bushings 4 of different sizes and firmly fix them at the installation port 11. The load application mechanism 2 accurately simulates the gradually increasing cantilever force borne by the outgoing bushing 4 under actual working conditions by stacking weights 23, which solves the problem of not being able to accurately control the load increase in the prior art. When the outgoing bushing 4 undergoes overload deformation or breakage, the constraint mechanism 3 can constrain the load application mechanism 2 in time to prevent it from falling out of control, thus avoiding damage to the test equipment and safety threats to the operators. The bearing bracket 15 and the base 17 provide stable support for the entire test device. Compared with the prior art, this test device has better adaptability, accuracy and safety, and can more accurately evaluate the performance of the outgoing bushing 4 under cantilever load, ensuring the safe and reliable operation of the ring main unit and the power system.

[0040] Example 2 refer to Figure 5The difference between this embodiment and Embodiment 1 is that it also includes a detection mechanism 5 for detecting deformation or breakage of the outlet sleeve 4. The detection mechanism 5 includes a detection frame 51 fixedly connected to the side of the support frame 1 and a detector 52 for detecting the outlet sleeve 4. The detector 52 is a detection camera. A mounting frame 53 is oscillatingly mounted on the detection frame 51. A swing motor 54 is installed at the detection frame 51. The output end of the swing motor 54 is connected to the mounting frame 53, and the swing motor 54 drives the mounting frame 53 to swing. The detector 52 is mounted on the mounting frame 53 and moves with the mounting frame 53. The oscillating detection mechanism 5 is used to detect the deformation or breakage of the outlet sleeve 4. The detection frame 51 is fixedly connected to the side of the bearing frame 1, providing a stable mounting base for the detector 52. The mounting frame 53 is oscillatingly mounted on the detection frame 51, and the detector 52 is mounted on the mounting frame 53 and can follow its oscillation. In this way, the detector 52 can flexibly adjust the detection angle and position according to the actual state of the outlet sleeve 4, so as to more comprehensively and accurately detect the deformation or breakage of the outlet sleeve 4 during the cantilever load test, obtain the status information of the outlet sleeve 4 in a timely manner, and improve the accuracy and reliability of the detection.

[0041] Example 3 refer to Figure 6 The difference between this embodiment and Embodiment 1 is that: Adjusting cylinders 13 are fixedly connected to both sides of the bearing frame 1 and below the outlet sleeve 4; a correction ring 6 is sleeved on the outside of the pressure plate 22; the adjusting cylinders 13 and the correction ring 6 are in the same axial direction; an adjusting rod 14 is provided at the output end of the adjusting cylinders 13; the adjusting rod 14 is connected to the outside of the correction ring 6; during the process of applying an increasing load in the cantilever direction to the outlet sleeve 4, the outlet sleeve 4 may experience a certain degree of displacement or tilt, resulting in uneven force and affecting the accuracy of the test results; at this time, the adjusting cylinders 13 are activated, and the output end of the adjusting cylinders 13 drives the adjusting rod 14 to move. Since the adjusting rod 14 is connected to the correction ring 6, the movement of the adjusting rod 14 will cause the correction ring 6 to apply force to the pressure plate 22, thereby adjusting the position of the pressure plate 22, and thus correcting the displacement or tilt of the outlet sleeve 4, ensuring that the outlet sleeve 4 is subjected to uniform force during the test, and improving the accuracy and reliability of the cantilever load test.

[0042] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cantilever load testing device for outgoing bushings of 10kV ring main units, characterized in that, include: The support frame (1) has mounting openings (11) on both sides for installing the cable sleeve (4). The mounting opening (11) is provided with an adjustable fixing mechanism (12) for adapting to different sizes of the cable sleeve (4) and locking it in the support frame (1). A load application mechanism (2) is used to apply an increasing load in the cantilever direction to the outlet sleeve (4) fixed in the bearing frame (1). It includes a force-receiving ring (21) sleeved on the free end of the outlet sleeve (4), a pressure plate (22) fixedly connected to the lower part of the force-receiving ring (21), and several weights (23) for applying a vertical load. The pressure plate (22) has at least one vertical guide post (24) at its bottom. The weights (23) can be stacked along the guide post (24), and the load is transferred to the outlet sleeve (4) via the pressure plate (22) and the force-receiving ring (21) by the weight of the weights (23), simulating the cantilever stress state under actual working conditions. The restraint mechanism (3) is installed on the bearing frame (1) and works in conjunction with the load application mechanism (2) to restrain the load application mechanism (2) when the outlet bushing (4) is overloaded or broken, so as to prevent it from falling out of control.

2. The cantilever load test device for a 10kV ring main unit outgoing bushing according to claim 1, characterized in that: The constraint mechanism (3) includes a support block (31) fixedly connected to the top of the bearing frame (1), a support column (32) symmetrically arranged on the side of the support block (31), a multi-section rod (33) rotatably connected to the support column (32), and a constraint block (34) arranged at the tail end of the multi-section rod (33). A connecting rope (35) is fixedly connected to the constraint block (34). The connecting rope (35) is connected to the upper end face of the force ring (21) to constrain the force ring (21).

3. The cantilever load test device for the outgoing bushing of a 10kV ring main unit according to claim 2, characterized in that: The multi-section rod (33) comprises at least two rod bodies, and the mating surface between the at least two rod bodies is provided with an elastic element (36) for buffering the distance change of the multi-section rod (33), which serves as a buffer constraint when the force ring (21) falls.

4. The cantilever load test device for a 10kV ring main unit outgoing bushing according to claim 1, characterized in that: The fixing mechanism (12) includes a combination plate (121) bolted to the bearing frame (1). The combination plate (121) is provided with a limiting hole (122) adapted to the size of the outlet sleeve (4). The outlet sleeve (4) passes through the limiting hole (122) and is engaged in the limiting hole (122).

5. A cantilever load testing device for a 10kV ring main unit outgoing bushing according to claim 4, characterized in that: The fixing mechanism (12) further includes a limiting sleeve (123) for limiting the outlet sleeve (4) at the combination plate (121). The limiting sleeve (123) is fastened to the outside of the outlet sleeve (4) on the inside of the bearing frame (1). The limiting sleeve (123) is fixedly connected to the combination plate (121) by bolts.

6. The cantilever load test device for a 10kV ring main unit outgoing bushing according to claim 1, characterized in that: It also includes a detection mechanism (5) for detecting the deformation or breakage of the outlet sleeve (4). The detection mechanism (5) includes a detection frame (51) fixedly connected to the side of the support frame (1) and a detector (52) for detecting the outlet sleeve (4). A mounting frame (53) is swaying on the detection frame (51). The detector (52) is mounted on the mounting frame (53) and swings with the mounting frame (53).

7. The cantilever load test device for a 10kV ring main unit outgoing bushing according to claim 1, characterized in that: Adjusting cylinders (13) are fixedly connected to both sides of the bearing frame (1) and below the outlet sleeve (4). A correction ring (6) is sleeved on the outside of the pressure plate (22). The adjusting cylinder (13) and the correction ring (6) are in the same axial direction. An adjusting rod (14) is provided at the output end of the adjusting cylinder (13). The adjusting rod (14) is connected to the outside of the correction ring (6).

8. The cantilever load test device for a 10kV ring main unit outgoing bushing according to claim 1, characterized in that: The bottom of the support frame (1) is provided with a support bracket (15), and reinforcing plates (16) are fixedly connected around the support bracket (15). A base (17) is fixedly connected to the bottom of the support bracket (15) and the bottom of the reinforcing plate (16).

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