Low voltage cable branch box

Abstract

The application provides a low-voltage cable branch box, which comprises a box body, a box door and a grounding conductive mechanism for establishing a grounding passage between the box body and the box door, wherein the grounding conductive mechanism comprises a first grounding wire, a first conductive component, a second grounding wire and a second conductive component; the first grounding wire is arranged on the inner side of the box door, one end of the first grounding wire is electrically connected with a handle arranged on the outer side of the box door, and the other end is electrically connected with the first conductive component; one end of the second grounding wire is electrically connected with the second conductive component, and the other end is used for being electrically connected with a grounding device arranged in the box body; the first conductive component and the second conductive component keep sliding contact during the rotation of the box door relative to the box body; and a wear detection mechanism is arranged for detecting the wear of the second conductive component and / or the first conductive component caused by the sliding contact. The application can fundamentally eliminate the problem of breakage of the grounding wire core and reduce the maintenance cost by timely finding the hidden danger of excessive wear.

Description

Technical Field

[0001] This invention relates to the field of cable branch box technology, and particularly to a low-voltage cable branch box. Background Technology

[0002] Cable branch boxes are important equipment used for cable branching and switching in power distribution systems. They are widely used in power laying scenarios such as urban power grids and industrial parks. Their safety protection performance directly affects the stable operation of the power distribution network and is a key facility to ensure the personal safety of on-site operators.

[0003] Existing low-voltage cable distribution boxes are all equipped with grounding protection systems. The grounding wire, as the core component of this system, is electrically connected at one end to the grounding device inside the box, and at the other end extends to the box door and connects to the door handle, ensuring the door is always grounded and preventing electric shock accidents caused by operators touching the handle when the box leaks current. However, existing grounding wires often use a single, integrated structure. During repeated opening and closing of the box door, the part of the grounding wire corresponding to the door's rotation is continuously subjected to bending forces. Over time, this can easily cause the internal core wire to break and become damaged. Furthermore, the core wire is encased in a rubber sheath, making it impossible to directly observe and detect damage from the outside, hindering timely detection and repair. This greatly increases the risk of electric shock accidents and poses a significant safety hazard. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a low-voltage cable branch box, which aims to solve at least one of the technical problems in the background art mentioned above.

[0005] The purpose of this invention is to provide a low-voltage cable branch box, including a box body and a door rotatably connected to one side of the box body, and further comprising: A grounding and conductive mechanism is used to establish a grounding path between the enclosure and the door. The grounding and conductive mechanism includes a first grounding wire, a first conductive component, a second grounding wire, and a second conductive component. The first grounding wire is located on the inside of the box door, one end of the first grounding wire is electrically connected to the handle located on the outside of the box door, and the other end is electrically connected to the first conductive component. One end of the second grounding wire is electrically connected to the second conductive component, and the other end is used to be electrically connected to the grounding device located inside the box. During the rotation of the box door relative to the box body, the first conductive component and the second conductive component maintain sliding contact to achieve electrical connection. A wear detection mechanism is used to detect wear on the second conductive component and / or the first conductive component caused by sliding contact.

[0006] In addition, the low-voltage cable branch box according to the present invention may also have the following additional technical features: Further, the first conductive component includes: The first terminal block is installed on the inside of the box door via the first elastic mounting member, and is used to electrically connect to one end of the first grounding wire; The first conductive sheet has one end electrically connected to the first terminal block, and the other end passes through the side wall of the housing and is installed on the outside of the housing door through the second elastic mounting member. The first conductive sheet is in sliding contact with the second conductive component.

[0007] Furthermore, the first conductive sheet includes a first connecting portion, a contact portion, and a second connecting portion connected in sequence. The first connecting portion is fixedly connected to the end face of the first terminal block, and the second connecting portion is connected to the second elastic mounting member. The contact portion is an open-ring structure for sliding contact with the second conductive component.

[0008] Furthermore, a guide block is provided on the side wall of the housing, and a guide hole is provided on the guide block for the first conductive sheet to pass through. Rolling balls that roll against the surface of the first conductive sheet are respectively provided on the two opposite side walls of the guide hole.

[0009] Further, the second conductive component includes: The second terminal block is fixed on the inner wall of the housing and is used to electrically connect to one end of the second grounding wire; The second conductive sheet has one end electrically connected to the second terminal block, and the other end is detachably equipped with a conductive contact, which is used to slide in contact with the first conductive sheet.

[0010] Furthermore, the wear detection mechanism includes: A detection plate is fixed on the second conductive sheet, and a slider is provided at the bottom of the detection plate; A slide rail is fixed inside the housing, and the detection plate slides in conjunction with the slide rail via the slider. A distance sensor is located at one end of the slide rail and is positioned opposite the detection plate to detect the distance between the sensor and the detection plate.

[0011] Furthermore, the second conductive sheet includes a fixing part, an arc-shaped connecting part, and a mounting part connected in sequence. The fixing part is fixed on the end face of the second terminal block, and the mounting part is provided with the conductive contact and the detection plate.

[0012] Furthermore, the second terminal has the same structure as the first terminal, and the first terminal includes a terminal body, a conductive post disposed inside the terminal body, an elastic sheet, a contact block and a fastener; The terminal body is provided with a mating hole, and one end of the conductive post, the elastic sheet and the abutment block are provided in the mating hole. The other end of the conductive post passes through the terminal body and is electrically connected to the first conductive sheet or the second conductive sheet. The end of the fastener is rotatably connected to the abutment block. When one end of the first grounding wire or the second grounding wire is inserted into the mating hole and electrically connected to the conductive post, the end of the first grounding wire or the second grounding wire is fixed between the abutment block and the elastic sheet by rotating the fastener.

[0013] Furthermore, it also includes a limiting mechanism configured to restrict the rotation of the box door when the wear detection mechanism performs detection; the limiting mechanism includes a rotating shaft disposed on the box door and a mounting cylinder disposed on the box body, the rotating shaft being rotatably connected to the mounting cylinder; The mounting cylinder is equipped with an electromagnet, an elastic element, and a limiting plate. The electromagnet is configured to drive the limiting plate to overcome the force of the elastic element and abut against the bottom surface of the rotating shaft when energized.

[0014] Furthermore, it also includes a protective sleeve, the two ends of which are fixedly connected to the outer walls of the housing and the door, respectively, for covering the portion of the first conductive component located outside the housing.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present application adopts a segmented grounding conductive mechanism consisting of a first grounding wire, a first conductive component, a second conductive component, and a second grounding wire. During the opening and closing of the box door, the first conductive component and the second conductive component maintain sliding contact, ensuring a continuous and unobstructed grounding path. This effectively avoids the grounding wire being subjected to bending forces due to repeated rotation of the box door, fundamentally eliminating the problem of grounding wire core wire breakage and damage. Furthermore, a wear detection mechanism is provided, which monitors the wear of the conductive components in real time through a distance sensor, promptly detecting potential wear exceeding the standard and replacing the conductive contacts in the second conductive component in a timely manner. This significantly reduces maintenance costs and workload, while also preventing grounding failure caused by wear. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the low-voltage cable branch box of the present invention; Figure 2 This is a schematic diagram of the grounding conduction mechanism in the low-voltage cable branch box of the present invention; Figure 3This is a schematic diagram of the connection between the first conductive component and the second conductive component in the low-voltage cable branch box of the present invention. Figure 4 This is a schematic diagram of the structure of the first conductive component in the low-voltage cable branch box of the present invention; Figure 5 This is a cross-sectional schematic diagram of the grounding conduction mechanism in the low-voltage cable branch box of the present invention; Figure 6 This is a schematic diagram of the wear detection mechanism in the low-voltage cable branch box of the present invention; Figure 7 This is a cross-sectional schematic diagram of the limiting mechanism in the low-voltage cable branch box of the present invention.

[0017] The above-mentioned drawings include the following reference numerals: 11-box body; 12-box door; 21-first grounding wire; 22-first terminal; 221-terminal body; 222-conductive post; 223-elastic sheet; 224-abutment block; 225-fastener; 23-first conductive sheet; 231-first connecting part; 232-contact part; 233-second connecting part; 241-first mounting bracket; 242-first spring; 251-second mounting bracket; 252-second spring; 26-guide block; 261-guide through hole; 262-ball bearing; 27-Snap-on; 31-Second conductive sheet; 311-Fixing part; 312-Arc-shaped connecting part; 313-Mounting part; 32-Conductive contact; 33-Second wiring terminal; 34-Second grounding wire; 41-Detection plate; 42-Slider; 43-Slide rail; 44-Distance sensor; 45-Mounting block; 51-Rotating shaft; 52-Mounting cylinder; 53-Electromagnet; 54-Elastic element; 55-Limiting piece; 60-Protective sleeve; 71-Transmission plate; 72-First connecting plate; 73-First plug-in plate; 74-Second connecting plate; 75-Second plug-in plate.

[0018] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Please see Figures 1 to 7 The diagram shows a low-voltage cable branch box of the present invention, which includes a box body 11, a box door 12, a grounding conduction structure, a wear detection mechanism, and a limiting mechanism. The box body 11 is used to accommodate internal cables, grounding devices, and various mechanisms. The box door 12 is rotatably connected to one side of the box body 11 to realize opening and closing operations. The grounding and conductive mechanism establishes a grounding path between the enclosure 11 and the door 12, preventing safety hazards caused by leakage current in the door 12 and handle, and effectively ensuring the safety of equipment and personnel operation. Specifically, the grounding and conductive mechanism includes a first grounding wire 21, a first conductive component, a second grounding wire 34, and a second conductive component. The first grounding wire 21 is located on the inner side of the door 12. One end of the first grounding wire 21 is electrically connected to the handle (not shown) located on the outer side of the door 12 by bolting or welding. The other end of the first grounding wire 21 is electrically connected to the first conductive component to achieve stable current transmission. One end of the second grounding wire 34 is electrically connected to the second conductive component, and the other end of the second grounding wire 34 is used to electrically connect to the grounding device located inside the enclosure 11, ultimately guiding the current to the ground and completing the grounding protection. During the rotation of the door 12 relative to the enclosure 11, the first conductive component and the second conductive component maintain sliding contact to achieve electrical connection, ensuring that the grounding path of the door 12 remains unobstructed during opening and closing.

[0023] In this embodiment, to ensure that the first grounding wire 21 is routed in a standardized manner and to avoid damage from pulling, a plurality of buckles 27 are provided on the inner side of the door 12. The spacing of the buckles 27 is adapted to the routing trajectory of the first grounding wire 21, which is used to guide the first grounding wire 21 and fix the grounding wire to prevent it from being displaced due to the rotation of the door 12.

[0024] The first conductive component includes a first terminal block 22 and a first conductive sheet 23. The first terminal block 22 is mounted on the inside of the door 12 via a first elastic mounting member for electrical connection to one end of the first grounding wire 21. The first elastic mounting member includes a first mounting bracket 241 and a first spring 242. The first mounting bracket 241 has a first mounting groove adapted to the shape of the first terminal block 22. The groove size matches the first terminal block 22, ensuring that the first terminal block 22 can move slightly along the depth direction of the groove. One end of the first terminal block 22 is located in the first mounting groove, and its end face is fixedly connected to the bottom of the groove of the first mounting bracket 241 via the first spring 242. This elastic mounting method can provide axial buffer for the first terminal block 22, preventing the vibration generated when the door 12 rotates from causing loose wiring or poor contact. The first mounting bracket 241 is fixedly installed on the inside of the door 12 by welding or bolting, providing a stable mounting base for the first terminal block 22.

[0025] One end of the first conductive sheet 23 is electrically connected to the first terminal 22 by welding or bolting, and the other end passes through the side wall of the housing 11 and is installed on the outside of the door 12 through the second elastic mounting member. The first conductive sheet 23 is in sliding contact with the second conductive component. Specifically, in this embodiment, the first conductive sheet 23 includes a first connecting part 231, a contact part 232 and a second connecting part 233 connected in sequence. The first connecting part 231 is fixedly connected to the end face of the first terminal 22 by welding to ensure efficient current conduction. The second connecting part 233 is adapted to the second mounting groove of the second elastic mounting member and is elastically connected by the second spring 252.

[0026] Furthermore, the contact portion 232 has an open ring structure for sliding contact with the second conductive component, and the ring of the contact portion 232 movably penetrates one side wall of the housing 11.

[0027] The second elastic mounting component includes a second mounting bracket 251 and a second spring 252. The second mounting bracket 251 has a second mounting groove adapted to the second connecting part 233. The second connecting part 233 is located in the second mounting groove, and one side of it is fixedly connected to the bottom of the groove of the second mounting bracket 251 through the second spring 252 to buffer the lateral force on the first conductive sheet 23 when the door 12 rotates, and to prevent the conductive contact 32 of the second conductive component from detaching. The side of the second mounting bracket 251 opposite to the second connecting part 233 is fixedly connected to the outer side of the door 12 by welding or bolting. In conjunction with the design of the first mounting bracket 241, it ensures the stable installation of the first conductive component on the door 12 and prevents the component from loosening or shifting due to frequent rotation of the door 12.

[0028] To prevent the first conductive sheet 23 from shifting or getting stuck during the rotation of the door 12 and to ensure stable contact with the second conductive component, a mounting hole is provided on the side wall of the housing 11. A guide block 26 is fixed in the mounting hole. The guide block 26 has a guide through hole 261 through which the first conductive sheet 23 passes. Rolling balls 262 that roll against the surface of the first conductive sheet 23 are respectively provided on the two opposite side walls of the guide through hole 261. The rolling of the rolling balls 262 reduces the friction between the first conductive sheet 23 and the guide block 26, reduces wear, and at the same time plays a precise guiding role. Specifically, the guide block 26 includes a first guide portion and a second guide portion arranged opposite to each other. The first guide portion and the second guide portion are spaced apart to form the guide through hole 261. The inner diameter of the through hole is larger than the thickness of the contact portion 232 of the first conductive sheet 23. The sides of the first guide portion and the second guide portion opposite to each other are arc surface structures adapted to the curvature of the contact portion 232 of the first conductive sheet 23. Multiple balls 262 are provided on the arc surfaces on both sides. The balls 262 are evenly spaced and can rotate freely. Their surfaces roll against the contact portion 232 of the first conductive sheet 23. This not only achieves all-round guidance and support for the first conductive sheet 23 and avoids deformation of the contact portion 232 due to uneven force, but also greatly reduces contact friction, further ensuring the stability of sliding contact and the service life of the conductive component.

[0029] The first terminal 22 and the second terminal 33 have the same structure and are both used to achieve a detachable and stable electrical connection between the grounding wire and the conductive sheet. The first terminal 22 includes a terminal body 221, a conductive post 222, an elastic sheet 223, an abutment block 224, and a fastener 225 disposed inside the terminal body 221. The terminal body 221 is provided with a mating hole, in which one end of the conductive post 222, the elastic sheet 223, and the abutment block 224 are disposed. The other end of the conductive post 222 passes through the terminal body 221 and is welded and fixed to the first conductive sheet 23 or the second conductive sheet 31 to achieve electrical connection. The end of the fastener 225 is rotatably connected to the abutment block 224. When one end of the first grounding wire 21 or the second grounding wire 34 is inserted into the mating hole and electrically connected to the conductive post 222, by rotating the fastener 225, the abutment block 224 is pushed to move towards the elastic sheet 223, fixing the end of the first grounding wire 21 or the second grounding wire 34 between the abutment block 224 and the elastic sheet 223, thereby achieving the connection between the grounding wire and the terminal.

[0030] The second conductive component includes a second terminal block 33 and a second conductive sheet 31. The second terminal block 33 is fixed on the inner wall of the housing 11 and is used to electrically connect to one end of the second grounding wire 34. One end of the second conductive sheet 31 is electrically connected to the second terminal block 33, and the other end is detachably equipped with a conductive contact 32. The conductive contact 32 is used to slide in contact with the first conductive sheet 23. It adopts a detachable design, which facilitates the replacement of the conductive contact 32 after wear, without having to replace the entire second conductive sheet 31, thus reducing maintenance costs. The second conductive sheet 31 includes a fixing part 311, an arc-shaped connecting part 312, and a mounting part 313 connected in sequence. The fixing part 311 is fixed to the end face of the second terminal 33 by welding or bolt pressing. The arc-shaped connecting part 312 is designed to give the entire second conductive sheet 31 a certain elastic reset function. Utilizing its elastic properties, it can undergo slight elastic deformation when subjected to contact pressure or vibration from the first conductive component, and automatically reset after the external force disappears, ensuring that the conductive contact 32 on the second conductive sheet 31 can slide in contact with the contact part 232 on the first conductive sheet 23. The mounting part 313 integrates the conductive contact 32 and the detection plate 41. Specifically, the conductive contact 32 is located above the detection plate 41. The upper half of the mounting part 313 is provided with at least two slots. The conductive contact 32 is provided with corresponding locking blocks that are adapted to the slots. The depth of the slot is greater than the thickness of the locking block. The detachable connection between the conductive contact 32 and the second conductive sheet 31 is achieved through the cooperation of the locking block and the slot. The side of the conductive contact 32 facing away from the card block has an arc surface structure that matches the curvature of the contact portion 232 of the first conductive sheet 23, ensuring that it achieves full-surface contact with the contact portion 232 of the first conductive sheet 23, thereby improving conductivity stability and contact reliability.

[0031] In some embodiments, the first conductive sheet 23 and the second conductive sheet 31 can both be made of metal materials such as copper or copper alloys with excellent conductivity, with a thickness of 1mm-2mm, to ensure consistent overall conductivity and balanced contact pressure.

[0032] The wear detection mechanism works in conjunction with the grounding conductivity structure to detect wear on the second conductive component and / or the first conductive component caused by long-term sliding contact in real time. This allows for timely detection of potential component wear and replacement of corresponding components, ensuring safe equipment operation. The wear detection mechanism is used to detect wear on the second conductive component and / or the first conductive component caused by sliding contact. In this embodiment, the wear detection mechanism includes a detection plate 41, a slide rail 43, and a distance sensor 44. The detection plate 41 is fixed to the lower half of the mounting portion of the second conductive sheet 31 and moves synchronously with the second conductive sheet 31. A slider 42 is provided at the bottom of the detection plate 41, and the slider 42 is adapted to the slide rail 43. The slide rail 43 is fixed to the bottom wall inside the housing 11 by bolt connection or welding. The detection plate 41 slides with the slide rail 43 through the slider 42. Preferably, the slider 42 and the slide rail 43 adopt a damping fit to avoid the detection plate 41 from being mis-displaced due to the vibration of the equipment operation, thus ensuring the detection accuracy. A mounting block 45 is provided at the end of the slide rail 43 away from the second conductive sheet 31. The bottom of the mounting block 45 is fixed to the bottom wall of the housing 11 by welding. A distance sensor 44 is fixedly installed on the mounting block 45. The distance sensor 44 is arranged opposite to the detection plate 41. The detection direction of the distance sensor 44 is consistent with the sliding direction of the detection plate 41, and it is used to detect the distance between it and the detection plate 41 in real time. The detection data can be transmitted to an external control terminal.

[0033] In practical applications, the detection principle of the wear detection mechanism can be as follows: When the first conductive component and the second conductive component are in long-term sliding contact, the conductive contact 32 will gradually wear down, resulting in a decrease in the contact pressure between them. At this time, the arc-shaped connecting part 312 of the second conductive sheet 31 will release its own elastic potential energy, achieving elastic reset and causing the second conductive sheet 31 to undergo a slight displacement towards the first conductive component. The displacement direction is consistent with the extension direction of the slide rail 43, and the displacement amount is positively correlated with the amount of wear. When the second conductive sheet 31 is displaced, the detection plate 41 will be driven to slide synchronously along the slide rail 43, causing a change in the distance between the detection plate 41 and the distance sensor 44. The distance sensor 44 transmits the real-time detected distance signal to the external control terminal. Based on the preset wear threshold in the control terminal, the wear degree of the conductive component is judged (set according to the design thickness of the conductive contact 32, usually 0.5-1mm, corresponding to a distance change of 0.5-1mm). Specifically, when the distance change exceeds the preset threshold, it is determined that the conductive component is worn beyond the standard. The control terminal immediately issues an audible and visual warning signal to remind the staff to replace the worn parts in time, realizing real-time monitoring and early warning of wear status, fundamentally avoiding grounding failure, equipment leakage and other faults caused by wear. At the same time, the elastic reset function of the arc-shaped connection 312 can ensure that the conductive component can still maintain stable contact in the early stage of wear, further ensuring the continuity of the grounding path. The damping cooperation between the detection plate 41 and the slide rail 43 can effectively avoid the erroneous displacement of the detection plate 41 caused by equipment vibration, ensuring detection accuracy.

[0034] The limiting mechanism works in conjunction with the wear detection mechanism to restrict the rotation of the door 12 during wear detection, preventing changes in the contact position between the first and second conductive components due to door 12 rotation, thus ensuring the accuracy of the detection data. Its structural design is based on electromagnetic control, providing rapid response and reliable limiting. Specifically, the limiting mechanism includes a rotating shaft 51 located on one side of the door 12 and a mounting cylinder 52 located at a corresponding position on the housing 11. The rotating shaft 51 and the mounting cylinder 52 are rotatably connected, and the rotating shaft 51 is fixedly connected to the door 12 by welding or keying. The housing 11 has a mounting hole adapted to the mounting cylinder 52, which is fitted into the mounting hole. The inner wall of the top opening of the mounting cylinder 52 rotates in conjunction with the circumferential surface of the rotating shaft 51, providing stable support for the rotation of the door 12. The mounting cylinder 52 contains an electromagnet 53, an elastic element 54, and a limiting plate 55. The elastic element 54 can be a compression spring with an elastic coefficient of 5N / mm-10N / mm. The limiting plate 55 can be made of wear-resistant materials such as asbestos or ceramics with a thickness of 3mm-5mm. The electromagnet 53 is electrically connected to the control terminal, and its working logic is linked with the wear detection mechanism.

[0035] In practical applications, the control logic between the limiting mechanism and the wear detection mechanism is as follows: When the wear detection mechanism starts detection (the control terminal receives the start signal from the distance sensor 44), the control terminal synchronously sends an energizing signal (24V DC) to the electromagnet 53. After the electromagnet 53 is energized, it generates magnetic force. The magnetic force overcomes the elastic force of the compression spring, driving the limiting plate 55 to move towards the rotating shaft 51 and tightly abut against the bottom surface of the rotating shaft 51. The static friction between the limiting plate 55 and the rotating shaft 51 is ≥50N, which can effectively limit the rotation of the rotating shaft 51, thereby limiting the door of the enclosure. The opening and closing of door 12; after the detection is completed (the control terminal receives the detection completion signal from distance sensor 44), the control terminal immediately controls the electromagnet 53 to be de-energized, the magnetic force disappears, and the limit plate 55 separates from the rotating shaft 51 under the reset action of the compression spring, the limit is released, and the door 12 can rotate normally, realizing the function of "limiting during detection and opening and closing freely when not detecting", which not only ensures the accuracy of the detection data, but also does not affect the normal operation and maintenance of the equipment; in addition, the mounting cylinder 52 is provided with a guide groove, and the limit plate 55 slides with the guide groove to avoid the limit plate 55 from shifting and causing the limit to fail.

[0036] The low-voltage cable branch box of this application also includes a protective sleeve 60. Both ends of the protective sleeve 60 are fixedly connected to the outer walls of the box body 11 and the box door 12 by clamps or bolts. The connection points are sealed with sealant (such as silicone sealant) to cover the portion of the first conductive component located outside the box body 11 (i.e., the exposed section of the second elastic mounting member and the first conductive sheet 23), preventing damage from external dust, rain, impacts, etc., and ensuring the service life and conductivity stability of the conductive component. Furthermore, the protective sleeve 60 has continuous corrugated structures on both sides with a corrugation spacing of 10mm-15mm, adapting to the maximum rotation angle of the box door 12. This structure can flexibly extend and bend, with an extension / bending range ≥50mm. When the box door 12 opens and closes, the corrugated protective sleeve 60 can deform synchronously with the rotation of the box door 12, preventing damage from pulling caused by the rotation of the box door 12.

[0037] The low-voltage cable distribution box of this application also includes a locking mechanism for locking the box door 12 onto the box body 11. Specifically, the locking mechanism includes a transmission plate 71, a first connecting plate 72 and a second connecting plate 74 disposed at both ends of the transmission plate 71. The middle part of the transmission plate 71 is fixedly connected to one end of the handle that passes through the box door 12, so as to realize the synchronous rotation of the handle and the transmission plate 71. The first connecting plate 72 and the second connecting plate 74 both extend along the height direction of the box door 12, and the ends of the first connecting plate 72 and the second connecting plate 74 away from the transmission plate 71 are respectively provided with an inclined first plug-in plate 73 and a second plug-in plate 75 with an inclination angle of 30°-45°. The corresponding positions of the box body 11 are respectively provided with a first plug-in hole and a second plug-in hole that cooperate with the first plug-in plate 73 and the second plug-in plate 75. When the door 12 is closed on the body 11, turning the handle causes the transmission plate 71 to rotate synchronously, causing the first connecting plate 72 and the second connecting plate 74 to move upward and downward along the height direction of the door 12, respectively. This causes the first plug-in plate 73 and the second plug-in plate 75 to be inserted into the corresponding first plug-in hole and second plug-in hole, respectively. The plug-in engagement achieves a locking connection between the door 12 and the body 11. To unlock, turning the handle in the opposite direction causes the first connecting plate 72 and the second connecting plate 74 to move in the opposite direction, causing the plug-in plates to disengage from the plug-in holes, thus completing the unlocking process.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows: The present application adopts a segmented grounding conductive mechanism consisting of a first grounding wire, a first conductive component, a second conductive component, and a second grounding wire. During the opening and closing of the box door, the first conductive component and the second conductive component maintain sliding contact, ensuring a continuous and unobstructed grounding path. This effectively avoids the grounding wire being subjected to bending forces due to repeated rotation of the box door, fundamentally eliminating the problem of grounding wire core wire breakage and damage. Furthermore, a wear detection mechanism is provided, which monitors the wear of the conductive components in real time through a distance sensor, promptly detecting potential wear exceeding the standard and replacing the conductive contacts in the second conductive component in a timely manner. This significantly reduces maintenance costs and workload, while also preventing grounding failure caused by wear.

[0039] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A low-voltage cable branch box, comprising a box body and a door rotatably connected to one side of the box body, characterized in that, Also includes: A grounding and conductive mechanism is used to establish a grounding path between the enclosure and the door. The grounding and conductive mechanism includes a first grounding wire, a first conductive component, a second grounding wire, and a second conductive component. The first grounding wire is located on the inside of the box door, one end of the first grounding wire is electrically connected to the handle located on the outside of the box door, and the other end is electrically connected to the first conductive component. One end of the second grounding wire is electrically connected to the second conductive component, and the other end is used to be electrically connected to the grounding device located inside the box. During the rotation of the box door relative to the box body, the first conductive component and the second conductive component maintain sliding contact to achieve electrical connection. A wear detection mechanism is used to detect wear on the second conductive component and / or the first conductive component caused by sliding contact.

2. The low-voltage cable voltage divider box according to claim 1, characterized in that, The first conductive component includes: The first terminal block is installed on the inside of the box door via the first elastic mounting member, and is used to electrically connect to one end of the first grounding wire; The first conductive sheet has one end electrically connected to the first terminal block, and the other end passes through the side wall of the housing and is installed on the outside of the housing door through the second elastic mounting member. The first conductive sheet is in sliding contact with the second conductive component.

3. The low-voltage cable voltage divider box according to claim 2, characterized in that, The first conductive sheet includes a first connecting part, a contact part, and a second connecting part connected in sequence. The first connecting part is fixedly connected to the end face of the first terminal, and the second connecting part is connected to the second elastic mounting member. The contact portion is an open-ring structure for sliding contact with the second conductive component.

4. The low-voltage cable voltage divider box according to claim 2, characterized in that, The side wall of the housing is provided with a guide block, and the guide block is provided with a guide through hole for the first conductive sheet to pass through. The two opposite side walls of the guide through hole are respectively provided with ball bearings that roll and abut against the surface of the first conductive sheet.

5. The low-voltage cable voltage divider box according to claim 2, characterized in that, The second conductive component includes: The second terminal block is fixed on the inner wall of the housing and is used to electrically connect to one end of the second grounding wire; The second conductive sheet has one end electrically connected to the second terminal block, and the other end is detachably equipped with a conductive contact, which is used to slide in contact with the first conductive sheet.

6. The low-voltage cable voltage divider box according to claim 5, characterized in that, The wear detection mechanism includes: A detection plate is fixed on the second conductive sheet, and a slider is provided at the bottom of the detection plate; A slide rail is fixed inside the housing, and the detection plate slides in conjunction with the slide rail via the slider. A distance sensor is located at one end of the slide rail and is positioned opposite the detection plate to detect the distance between the sensor and the detection plate.

7. The low-voltage cable voltage divider box according to claim 6, characterized in that, The second conductive sheet includes a fixing part, an arc-shaped connecting part, and a mounting part connected in sequence. The fixing part is fixed on the end face of the second terminal block, and the mounting part is provided with the conductive contact and the detection plate.

8. The low-voltage cable voltage divider box according to claim 5, characterized in that, The second terminal has the same structure as the first terminal. The first terminal includes a terminal body, a conductive post disposed inside the terminal body, an elastic sheet, a contact block, and a fastener. The terminal body is provided with a mating hole, and one end of the conductive post, the elastic sheet and the abutment block are provided in the mating hole. The other end of the conductive post passes through the terminal body and is electrically connected to the first conductive sheet or the second conductive sheet. The end of the fastener is rotatably connected to the abutment block. When one end of the first grounding wire or the second grounding wire is inserted into the mating hole and electrically connected to the conductive post, the end of the first grounding wire or the second grounding wire is fixed between the abutment block and the elastic sheet by rotating the fastener.

9. The low-voltage cable voltage divider box according to claim 1, characterized in that, It also includes a limiting mechanism configured to restrict the rotation of the box door when the wear detection mechanism performs detection; the limiting mechanism includes a rotating shaft disposed on the box door and a mounting cylinder disposed on the box body, the rotating shaft being rotatably connected to the mounting cylinder; The mounting cylinder is equipped with an electromagnet, an elastic element, and a limiting plate. The electromagnet is configured to drive the limiting plate to overcome the force of the elastic element and abut against the bottom surface of the rotating shaft when energized.

10. The low-voltage cable voltage divider box according to claim 1, characterized in that, It also includes a protective sleeve, the two ends of which are fixedly connected to the outer walls of the housing and the door, respectively, to cover the portion of the first conductive component located outside the housing.

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