A cable branch box and a fault diagnosis method thereof

Abstract

The application discloses a cable branch box and a fault diagnosis method thereof, and belongs to the technical field of power supply and distribution. The cable branch box comprises a box body and electrical equipment. A positioning seat, a pressing rod and a positioning plate are fixedly arranged on the electrical equipment. The upper side of the positioning plate is elastically connected in the positioning seat, and the positioning plate is provided with a positioning tooth and a limiting plate located on the outer side of the positioning plate. A fixing plate is arranged on the positioning seat. The fixing plate is provided with a fixing tooth and a limiting groove located on the outer side of the fixing plate. After the positioning tooth is engaged in the fixing tooth, the limiting plate is inserted into the limiting groove to prevent the positioning plate from being separated from the fixing plate. After the pressing rod is pressed, the positioning plate is moved, so that the positioning tooth and the limiting plate are separated from the fixing tooth and the limiting groove, respectively. The fault diagnosis method is to collect the load current and the contact voltage drop of the electrical equipment when the electrical equipment is static and moves, and then diagnose whether the electrical equipment is faulty. The cable branch box has the beneficial effect that the electrical equipment in the box body can be conveniently disassembled or transposed.

Description

Technical Field

[0001] This invention belongs to the field of power supply and distribution technology, specifically, it relates to a cable branch box and its fault diagnosis method. Background Technology

[0002] A cable distribution box is a device used in power supply and distribution systems to connect, distribute, and control cables. Its main function is to divide a main cable into multiple branch cables to supply power to different electrical equipment or areas. Cable distribution boxes are widely used in urban power distribution networks, industrial power distribution systems, and building electrical systems.

[0003] Existing cable distribution boxes typically house electrical equipment such as circuit breakers, fuses, and protective devices, which are usually directly fixed to mounting brackets inside the box using threaded fasteners. In actual use, when these devices need to be disassembled or moved, the threaded fasteners between the mounting brackets and the equipment must first be removed. After the equipment is successfully reinstalled or moved, the fasteners are then reinstalled on the mounting brackets. This makes it inconvenient to replace faulty equipment. Furthermore, most cable distribution box malfunctions are related to these electrical devices, and some of these devices have hidden faults when stationary. Because the aforementioned structure prevents the equipment from being easily moved, operators often fail to detect these hidden faults. Summary of the Invention

[0004] Existing cable distribution boxes use threaded fasteners to secure internal electrical equipment to mounting brackets, making disassembly and relocation inconvenient. This hinders equipment replacement in case of malfunction and prevents the detection of hidden faults when the equipment is stationary, causing considerable inconvenience. To address these issues, the following invention is proposed: A cable branch box includes a box body and electrical equipment. The box body is provided with a mounting frame, and the electrical equipment is fixedly provided with a mounting plate. The mounting plate is fixedly provided with a positioning seat. The positioning seat is provided with a pressing rod and a positioning plate. The pressing rod is movably disposed on the positioning seat and is drivenly connected to the positioning plate. The upper side of the positioning plate is elastically connected to the positioning seat, and the lower side is provided with positioning teeth. A limiting plate is provided outside the positioning teeth. A fixing plate is provided below the positioning seat and fixedly connected to the mounting frame. The fixing plate is provided with fixing teeth and a limiting groove located outside the fixing teeth.

[0005] When the positioning tooth engages with the fixed tooth, the limiting plate is inserted into the limiting groove to prevent the positioning plate from detaching from the fixed plate. After the pressing rod is pressed inward, it can drive the positioning plate to move, so that the positioning tooth and the limiting plate are respectively detached from the fixed tooth and the limiting groove.

[0006] Furthermore, the positioning seat is provided with an installation groove and a fixed cover that blocks the opening of the installation groove. One end of the pressing rod is provided with a pressing head located outside the installation groove, and the other end is provided with a driving head that penetrates into the installation groove and is truncated. The positioning plate is provided with an extension plate located in the installation groove. An obliquely arranged driven block is provided on the extension plate. The inner side of the driven block is provided with a driven surface that is pressed by the driving head. When the pressing head is pressed, the driving head drives the positioning plate to move into the installation groove, so that the positioning teeth and the limiting plate are respectively disengaged from the fixed teeth and the limiting groove.

[0007] Furthermore, the positioning seat is provided with an adjustment hole, and an adjustment sleeve is threaded into the adjustment hole. The adjustment sleeve is movably sleeved on the outside of the pressing rod. The pressing rod is also provided with rod baffles that block both ends of the adjustment sleeve. One end of the adjustment sleeve is also provided with a prism head. The rod baffle located in the mounting groove is always in contact with the prism head.

[0008] Furthermore, the mounting groove is provided with a slot for the positioning teeth to pass through, and the positioning plate is also provided with an inner baffle that blocks the inside of the slot; the mounting groove is provided with a spring post, the inner baffle is provided with a spring groove, and a spring is provided between the inner baffle and the mounting groove, with one end sleeved on the spring post and the other end inserted into the spring groove, so as to elastically connect the positioning plate to the mounting groove.

[0009] Furthermore, a locking groove is provided at the bottom of the electrical equipment. The mounting plate includes a first locking plate and a second locking plate that are fixedly connected. Both the first and second locking plates are provided with locking blocks that engage in the locking groove. Each of the first and second locking plates is provided with a side baffle. The two side baffles abut against both sides of the electrical equipment to prevent the electrical equipment from moving relative to the mounting plate.

[0010] Furthermore, the first card plate is provided with a card plate insertion post, and the second card plate is provided with a card plate insertion hole. The card plate insertion post is inserted into the card plate insertion hole to prevent the two from shifting to each other. A card plate fixing member is also threaded between the first card plate and the second card plate to fix the two together, that is, the first card plate and the second card plate are detachably fixedly connected.

[0011] Furthermore, each of the first and second card plates is provided with a positioning seat that is mirror-symmetrical from top to bottom. Each positioning seat is provided with a pressing rod and a positioning plate. The upper and lower sides of the fixing seat are provided with fixing teeth and limiting grooves located outside the fixing teeth. The positioning plate cooperates with the fixing seat from both the upper and lower sides to improve the stability of fixing the electrical equipment.

[0012] Furthermore, the mounting slot is provided with multiple adjusting components, and the first and second plates are provided with multiple adjusting holes that are threadedly connected to the adjusting components one by one, so as to fix the positioning seat to the first and second plates; the mounting frame is also provided with a frame fixing component that fixes it to the fixing plate.

[0013] This invention also proposes a fault diagnosis method for cable branch boxes, specifically, in the aforementioned cable branch box, the following steps are performed sequentially: Step S1: With the electrical equipment in a stationary state, collect the load current and contact voltage drop of the electrical equipment; Step S2: Press the pressing rod to move the electrical equipment along the fixed plate and collect the load current and contact voltage drop of the electrical equipment during the movement process; Step S3: Combining steps S1 and S2, the load current and contact voltage drop obtained during the stationary and moving processes of the electrical equipment are collected to diagnose the faults of the electrical equipment, thus indirectly achieving the purpose of diagnosing the faults of the cable branch box. This invention proposes a cable branch box and its fault diagnosis method. The cable branch box includes a box body and electrical equipment. The electrical equipment is provided with a positioning seat and a fixing plate located below the positioning seat. A pressing rod and a positioning plate are provided inside the positioning seat. The positioning plate is provided with positioning teeth and a limiting plate. The fixing plate is provided with fixing teeth that mesh with the positioning teeth and a limiting groove for the limiting plate to insert into. The fault diagnosis method diagnoses whether the electrical equipment has malfunctioned by collecting the load current and contact voltage drop of the electrical equipment when it is stationary and in motion. The advantages of this invention are twofold: firstly, pressing the pressing rod allows the positioning teeth and limiting plate to disengage from the fixing teeth and limiting groove, respectively, facilitating the removal of the electrical equipment from the fixing plate or its movement along the fixing plate, which is convenient; secondly, by combining the movable electrical equipment with the given fault diagnosis method, hidden faults in the electrical equipment within the cable branch box when stationary can be diagnosed and discovered, making the cable branch box safer and more reliable during use. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the cable branch box in this invention; Figure 2 This is a three-dimensional structural diagram of the electrical equipment in this invention; Figure 3 This is a partial structural diagram of the electrical equipment in this invention; Figure 4 This is a partial structural breakdown diagram of the electrical equipment in this invention; Figure 5 This is a schematic diagram of the internal structure of the mounting base in this invention; Figure 6 This is a three-dimensional structural diagram of the mounting base in this invention; Figure 7 This is a flowchart of the fault diagnosis method in this invention.

[0015] The correspondence between the labels and component names in the attached figures is as follows: 1. Electrical equipment; 2. Mounting plate; 3. Positioning seat; 4. Pressing rod; 5. Positioning plate; 6. Fixing plate; 7. Mounting cover; 11. Engaging groove; 12. Housing; 13. Mounting bracket; 14. Bracket fixing component; 21. First clamping plate; 22. Second clamping plate; 23. Engaging block; 24. Side baffle; 25. Clamping plate fixing component; 26. Clamping plate insertion post; 27. Clamping plate insertion hole; 28. Adjustment hole; 29. 31. Adjusting component; 32. Mounting groove; 33. Spring groove; 34. Spring post; 35. Adjusting sleeve; 36. Prism head; 37. Adjusting hole; 41. Pressing head; 42. Rod baffle; 43. Drive head; 51. Positioning tooth; 52. Limiting plate; 53. Inner baffle; 54. Outer extension plate; 55. Driven block; 56. Driven surface; 61. Fixing tooth; 62. Limiting groove; 63. Fixing hole. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments.

[0017] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0018] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0019] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0020] In addition to indicating location or positional relationship, some of the terms mentioned above may also have other meanings. For example, the term "above" may also be used in some cases to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0021] like Figures 1-6 As shown, this is a preferred embodiment of the present invention, a cable branch box, including a box body 12 and an electrical device 1. The box body 12 is provided with a mounting frame 13. A mounting plate 2 is fixedly provided at the bottom of the electrical device 1. A positioning seat 3 is fixedly provided on the mounting plate 2. A horizontal pressing rod 4 and a vertical positioning plate 5 are provided on the positioning seat 3. The pressing rod 4 is movably provided on the positioning seat 3 and is connected to the positioning plate 5 in a transmission manner. The upper side of the positioning plate 5 is elastically connected to the positioning seat 3, and the lower side is provided with a positioning tooth 51. A limiting plate 52 is also provided outside the positioning tooth 51. A fixing plate 6 is provided below the positioning seat 3 and is fixedly connected to the mounting frame 13. The fixing connection can be a threaded connection or welding. In this embodiment, a frame fixing member 14 is selected to fix the two with a threaded connection. The fixing plate 6 is provided with a fixing tooth 61 and a limiting groove 62 located outside the fixing tooth 61.

[0022] During use, the fixing plate 6 is first fixedly installed on a table. Before installing the electrical equipment 1 onto the fixing plate 6, the pressing rod 4 needs to be pressed from the side. The pressing rod 4 moves into the positioning seat 3, driving the positioning plate 5 to move vertically upward. Then, the mounting plate 2 can be attached to the fixing plate 6. After releasing the pressing rod 4, the positioning plate 5 is driven by the elastic force to move vertically downward until the positioning tooth 51 engages with the fixing tooth 61. At the same time, the limiting plate 52 is inserted into the limiting groove 62 to prevent the positioning plate 5 from disengaging from the fixing plate 6, thereby achieving the positioning of the electrical equipment 1. When it is necessary to remove the electrical equipment 1, press the pressing rod 4 to move the positioning plate 5 vertically upward, so that the positioning tooth 51 and the limiting plate 52 disengage from the fixing tooth 61 and the limiting groove 62 respectively. When it is only necessary to move the electrical equipment 1, press the pressing rod 4 to move the positioning plate 5 vertically upward, so that only the positioning tooth 51 disengages from the fixing tooth 61, but the limiting plate 52 does not disengage from the limiting groove 62. In particular, by applying a large pushing force to the electrical equipment 1, the positioning plate 5 can also be moved vertically upward by directly contacting the positioning tooth 51 with the fixing tooth 61.

[0023] Specifically, such as Figure 4As shown, the positioning seat 3 is also provided with a mounting groove 31 and a mounting cover 7 fixedly blocking the opening of the mounting groove 31. One end of the pressing rod 4 is provided with a pressing head 41 located outside the mounting groove 31, and the other end is provided with a driving head 43 penetrating into the inside of the mounting groove 31. The driving head 43 is frustoconical. The positioning plate 5 is provided with an extension plate 54 located in the mounting groove 31. The extension plate 54 is provided with an obliquely arranged driven block 55. The inner side of the driven block 55 is provided with a driven surface 56. When the pressing head 41 is not pressed, the driven surface 56 is driven by elastic force to always press against the driving head 43. After the pressing head 41 is pressed, the driving head 43 drives the positioning plate 5 to move vertically upward into the mounting groove 31, so that the positioning teeth 51 and the limiting plate 52 also move vertically upward respectively, until they disengage from the fixed teeth 61 and the limiting groove 62.

[0024] In this embodiment, as Figure 4 and Figure 5 As shown, the positioning seat 3 is provided with an adjustment hole 37, and an adjustment sleeve 35 is internally threaded into the adjustment hole 37. The adjustment sleeve 35 is movably sleeved on the outside of the pressing rod 4. The pressing rod 4 is also provided with rod baffles 42 that block the two ends of the adjustment sleeve 35. Since one end of the adjustment sleeve 35 is located inside the mounting groove 31 and the other end is located outside the mounting groove 31 and is provided with a prism head 36, the two rod baffles 42 are located inside and outside the mounting groove 31, respectively. The rod baffle 42 located inside the mounting groove 31 is always in contact with the end of the adjustment sleeve 35 because the driving head 43 is pressed by the driven block 55. Rotating the adjustment sleeve 35 can drive the pressing rod 4 to move in advance towards the inside or outside of the mounting groove 31, thereby allowing the positioning plate 5 to move in advance. The pre-moved positioning plate 5 will change the pressing stroke required when pressing the pressing rod 4 later, which can shorten or extend the pressing time.

[0025] Furthermore, a slot for the positioning tooth 51 to pass through is provided in the mounting groove 31, and an inner baffle 53 is provided on the positioning plate 5 to block the inner side of the mounting groove 31. The inner baffle 53 prevents the positioning plate 5 from moving vertically downward and disengaging from the mounting groove 31. A spring post 34 is also provided in the mounting groove 31, and a spring groove 33 is provided on the inner baffle 53. A spring 32 is provided between the inner baffle 53 and the mounting groove 31, with one end sleeved on the spring post 34 and the other end inserted into the spring groove 33, so as to elastically connect the positioning plate 5 to the mounting groove 31.

[0026] In this embodiment, as Figure 4As shown, a locking groove 11 is provided at the bottom of the electrical equipment 1. The mounting plate 2 includes a first locking plate 21 and a second locking plate 22 that are fixedly connected. Both the first locking plate 21 and the second locking plate 22 are provided with locking blocks 23 that engage with the locking groove 11. Each of the first locking plate 21 and the second locking plate 22 is provided with a side baffle 24. The two side baffles 24 abut against the two sides of the electrical equipment 1 to prevent the electrical equipment 1 from moving relative to the mounting plate 2.

[0027] Furthermore, the first card plate 21 is provided with a card plate insertion post 26, and the second card plate 22 is provided with a card plate insertion hole 27. The card plate insertion post 26 is inserted into the card plate insertion hole 27 to prevent the two from shifting to each other. A card plate fixing member 25 is also threaded between the first card plate 21 and the second card plate 22 to fix the two together.

[0028] like Figures 2-4 As shown, one or more positioning seats 3 can be provided. In this embodiment, each of the first and second clamping plates 21 and 22 is provided with a positioning seat 3 that is mirror-symmetrical. Each positioning seat 3 has a pressing rod 4 and a positioning plate 5 in its mounting groove 31. The upper and lower sides of the fixing seat are provided with fixing teeth 61 and limiting grooves 62 located outside the fixing teeth 61. The positioning teeth 51 on the upper positioning plate 5 mesh with the fixing teeth 61 on the upper side, and the positioning teeth 51 on the lower positioning plate 5 mesh with the fixing teeth 61 on the lower side, so as to improve the fixing stability of the electrical equipment 1. Furthermore, the mounting groove 31 is provided with a plurality of adjusting members 29, and the first and second clamping plates 21 and 22 are provided with a plurality of adjusting holes 28 that are threadedly connected to the adjusting members 29, so as to detachably fix the positioning seat 3 to the mounting plate 2.

[0029] like Figure 7 As shown, a fault diagnosis method for a cable branch box involves performing the following steps sequentially within the cable branch box: Step S1: Collect the load current and contact voltage drop of electrical equipment 1 when it is stopped. First, keep electrical equipment 1 in a static state. Using a current transformer and an oscilloscope installed inside the cable branch box, record the effective value of the three-phase load current and the effective value of the three-phase contact voltage drop of electrical equipment 1, respectively. These are denoted as static load current I and static contact voltage drop U.

[0030] Before proceeding to step S2, it is necessary to determine whether electrical equipment 1 is already in a fault state and calculate the static impedance Z, where the formula is: If the static impedance has significantly exceeded the factory standard value, it is determined that electrical equipment 1 has burned out, and the cable branch box is naturally in a serious fault state; otherwise, proceed to step S2.

[0031] Step S2: Collect the load current and contact voltage drop of electrical equipment 1 while it is in motion. After pressing the pressing lever 4, the electrical equipment 1 moves along the fixed plate 6. The effective values ​​of the three-phase load current and the effective values ​​of the three-phase contact voltage drop of the electrical equipment 1 during the movement are collected at high frequency to obtain the dynamic load current waveform. and dynamic contact voltage drop wave Where t is the acquisition time point, and the dynamic impedance can be calculated. ,have ; Step S3: Combine the data collected in steps S1 and S2 to perform dynamic fault diagnosis on electrical equipment 1.

[0032] Based on the static load current I, static contact voltage drop U, and static impedance Z obtained in step S1, and the dynamic load current waveform obtained in step S2... Dynamic contact voltage drop wave Dynamic impedance To diagnose whether electrical equipment 1 has malfunctioned, in this embodiment, referring to the existing experience with malfunctions of electrical equipment 1 in cable branch boxes, the following fault diagnosis results are usually obtained: (1) , , The value remains relatively stable and does not change much compared to I, U, and Z. At this time, electrical equipment 1 is in normal condition; (2) , The same amplitude fluctuations occurred. If the load remains relatively stable and does not change much compared to Z, it can be concluded that the electrical equipment is currently only subject to a small amount of load interference. Therefore, electrical equipment 1 is in a pseudo-fault state and the power supply and distribution system needs to be inspected. (3) High-frequency noise appeared. The situation remained basically stable; The violent oscillation indicates that during the movement of electrical equipment 1, a fault of poor dynamic contact has occurred due to a loose connection at its contact point, requiring electrical equipment 1 to be shut down for maintenance; (4) A sudden surge occurred. Instant fall If the value approaches infinity, it indicates that electrical equipment 1 experienced an arcing break during movement, requiring immediate power outage and maintenance. Depending on the usage scenarios of electrical equipment 1 and the cable branch box, further fault diagnosis results for electrical equipment 1 can be provided, facilitating targeted maintenance of electrical equipment 1 within the cable branch box. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cable branch box, comprising a box body (12) and electrical equipment (1), wherein a mounting bracket (13) is provided inside the box body (12), characterized in that: The electrical equipment (1) is fixedly provided with a mounting plate (2), and a positioning seat (3) is fixedly provided on the mounting plate (2). A pressing rod (4) and a positioning plate (5) are provided on the positioning seat (3). The pressing rod (4) is movably provided on the positioning seat (3) and is connected to the positioning plate (5) in a transmission manner. The upper side of the positioning plate (5) is elastically connected to the positioning seat (3), and a positioning tooth (51) is provided on its lower side. A limiting plate (52) is provided on the outer side of the positioning tooth (51). A mounting bracket (13) is provided below the positioning seat (3). The fixing plate (6) is fixedly connected to the fixing plate (6). The fixing plate (6) has a fixing tooth (61) and a limiting groove (62) located outside the fixing tooth (61). After the positioning tooth (51) engages in the fixing tooth (61), the limiting plate (52) is inserted into the limiting groove (62) to prevent the positioning plate (5) from detaching from the fixing plate (6). After the pressing rod (4) is pressed inward, it drives the positioning plate (5) to move, so that the positioning tooth (51) and the limiting plate (52) are respectively detached from the fixing tooth (61) and the limiting groove (62).

2. The cable branch box according to claim 1, characterized in that: The positioning seat (3) is provided with an installation groove (31) and a fixed cover (7) that blocks the opening of the installation groove (31). One end of the pressing rod (4) is provided with a pressing head (41) located outside the installation groove (31), and the other end is provided with a driving head (43) that penetrates into the installation groove (31) and is truncated. The positioning plate (5) is provided with an extension plate (54) located in the installation groove (31). The extension plate (54) is provided with a driven block (55) arranged obliquely. The inner side of the driven block (55) is provided with a driven surface (56) pressed by the driving head (43). When the pressing head (41) is pressed, the driving head (43) drives the positioning plate (5) to move into the installation groove (31), so that the positioning teeth (51) and the limiting plate (52) are respectively disengaged from the fixed teeth (61) and the limiting groove (62).

3. The cable branch box according to claim 2, characterized in that: The positioning seat (3) is provided with an adjustment hole (37), and an adjustment sleeve (35) is threadedly connected to the adjustment hole (37). The adjustment sleeve (35) is movably sleeved on the outside of the pressing rod (4). The pressing rod (4) is also provided with rod baffles (42) that block the two ends of the adjustment sleeve (35). One end of the adjustment sleeve (35) is also provided with a prism head (36).

4. The cable branch box according to claim 3, characterized in that: The mounting groove (31) is provided with a slot for the positioning teeth (51) to pass through. The positioning plate (5) is also provided with an inner baffle (53) that blocks the inside of the mounting groove (31). The mounting groove (31) is provided with a spring post (34). The inner baffle (53) is provided with a spring groove (33). A spring (32) is provided between the inner baffle (53) and the mounting groove (31), with one end sleeved on the spring post (34) and the other end inserted into the spring groove (33), so as to elastically connect the positioning plate (5) to the mounting groove (31).

5. The cable branch box according to claim 4, characterized in that: The electrical equipment (1) is provided with a locking groove (11) at the bottom. The mounting plate (2) includes a first locking plate (21) and a second locking plate (22) that are fixedly connected. Both the first locking plate (21) and the second locking plate (22) are provided with locking blocks (23) that engage with the locking groove (11). Each of the first locking plate (21) and the second locking plate (22) is provided with a side baffle (24). The two side baffles (24) abut against the two sides of the electrical equipment (1) respectively to prevent the electrical equipment (1) from moving relative to the mounting plate (2).

6. The cable branch box according to claim 5, characterized in that: The first card plate (21) is provided with a card plate insert post (26), and the second card plate (22) is provided with a card plate insertion hole (27). The card plate insert post (26) is inserted into the card plate insertion hole (27) to prevent the two from shifting to each other. A card plate fixing member (25) is also threaded between the first card plate (21) and the second card plate (22) to fix the two.

7. The cable branch box according to claim 6, characterized in that: Each of the first card plate (21) and the second card plate (22) is provided with a positioning seat (3) that is mirror-symmetrical. Each positioning seat (3) is provided with a pressing rod (4) and a positioning plate (5). The upper and lower sides of the fixed seat are provided with fixing teeth (61) and limiting grooves (62) located outside the fixing teeth (61).

8. The cable branch box according to claim 7, characterized in that: The mounting slot (31) is provided with multiple adjusting parts (29), and the first card plate (21) and the second card plate (22) are provided with multiple adjusting holes (28) that are threadedly connected to the adjusting parts (29); the mounting frame (13) is also provided with a frame fixing part (14) that is fixedly connected to the fixing plate (6).

9. A fault diagnosis method for a cable branch box, characterized in that: In the cable branch box as described in any one of claims 1-8, the following steps are performed sequentially. Step S1: When the electrical equipment is in a static state, collect the load current and contact voltage drop of the electrical equipment (1); Step S2: Press the pressing rod (4) to move the electrical equipment (1) along the fixed plate (6) and collect the load current and contact voltage drop of the electrical equipment (1) during the movement process; Step S3: Combining steps S1 and S2, the load current and contact voltage drop obtained during the stationary and moving processes of the electrical equipment (1) are collected to perform fault diagnosis on the electrical equipment (1).

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