A smart repair device for electricity meter terminals

Abstract

This invention discloses an intelligent repair device for electricity meter terminals, comprising a frame body, an electricity meter positioning unit, a fault detection unit, a fault location unit, a fault repair unit, a central control unit, a power supply, and a communication unit. The electricity meter positioning unit is installed above the frame body, the fault detection unit is installed at the lower middle edge of the frame body, the fault location unit is installed at the lower two side edges of the frame body, and the fault repair unit is installed on the fault location unit. The central control unit, power supply, and communication unit are installed inside the frame body. This intelligent repair device is compatible with single-phase and three-phase direct-through electricity meters, automatically detects and accurately locates faulty screw holes in the terminals, and repairs only the faulty screw holes, achieving efficient, accurate, and non-destructive automated repair, improving the work efficiency of power metering equipment maintenance, and ensuring reliable repair.

Description

Technical Field

[0001] This invention relates to the field of power metering equipment maintenance technology, and in particular to an intelligent repair device for the terminals of an electricity meter. Background Technology

[0002] With the continuous development of smart grids and ubiquitous power Internet of Things, electricity meters, as the core equipment for electricity metering and settlement between electricity users and the power grid, directly affect the fairness of billing, the stability of the power system, and electricity safety. During long-term service and periodic replacement, disassembly, and maintenance of electricity meters, the screw holes at the terminals are among the most vulnerable points for failure. Because the electricity meter terminals are constantly exposed to complex and changing field environments, factors such as humidity, salt spray, industrial pollution, and temperature fluctuations can easily damage the anti-corrosion layer on the screw surface, leading to rust. Simultaneously, during on-site maintenance, meter replacement, or wiring modifications, foreign objects such as dust, oil, and copper shavings can easily fall into the screw holes. Furthermore, frequent or improper disassembly and assembly operations can cause the threads themselves to strip, become cross-threaded, or even break. Once these failures occur, they will directly lead to increased contact resistance, poor contact, and overheating, resulting in inaccurate metering, data acquisition failure, and in severe cases, electrical fires or equipment damage accidents.

[0003] Currently, in actual operation and maintenance, as well as meter calibration and pre-scraping procedures, the inspection and repair of terminal screw holes mainly rely on manual operation. However, the inspection and repair of loose terminals presents the following problems:

[0004] 1. Manual inspection relies on experience, which can easily lead to missed or misjudged faulty screw holes, and it cannot accurately locate them;

[0005] 2. Repairing requires processing each screw hole individually, which is inefficient and can easily cause secondary damage to intact screw holes.

[0006] 3. The terminal layout and hole spacing of single-phase meters and three-phase meters differ greatly, and the existing tools have poor compatibility, requiring frequent replacement of fixtures or equipment.

[0007] 4. Poor consistency in manual operation and unstable repair quality affect the reliability of subsequent use of the electricity meter.

[0008] Even when performed by experienced technicians, manual repairs cannot guarantee consistent tapping force, depth, angle, and thoroughness. Differences in technique between operators, and even variations in the physical strength and concentration of the same operator at different times, can lead to fluctuations in repair results. Some screw holes may suffer secondary thread damage, incomplete thread profiles, enlarged screw holes, or incomplete tapping. Inconsistent repair quality directly impacts the reliability of wiring after the electricity meter is put back into use. Summary of the Invention

[0009] To overcome the above problems, the purpose of this invention is to provide an intelligent repair device for electricity meter terminals. This intelligent repair device is compatible with single-phase and three-phase direct-through electricity meters, automatically detects and accurately locates faulty screw holes in the terminals, and repairs only the faulty screw holes, achieving efficient, accurate, and non-destructive automated repair, improving the work efficiency of power metering equipment maintenance, and ensuring reliable repair.

[0010] The technical solution adopted in this invention is:

[0011] A smart repair device for electricity meter terminals, characterized in that it includes a frame body, an electricity meter positioning unit, a fault detection unit, a fault location unit, a fault repair unit, a central control unit, a power supply, and a communication unit. The frame body is a cuboid structure with a hollow interior. The electricity meter positioning unit is installed at the top of the frame body. The fault detection unit is installed at the lower middle edge of the frame body. The fault location unit is installed at the lower two side edges of the frame body. The fault repair unit is installed on the fault location unit. The central control unit, power supply, and communication unit are installed inside the frame body. The fault detection unit, fault location unit, fault repair unit, and power supply are all connected to the central control unit.

[0012] The fault location unit includes an X-axis linear module, a Y-axis linear module, a Z-axis linear module, an X-axis column, a Y-axis column, and a Z-axis bracket. Each of the X-axis, Y-axis, and Z-axis linear modules has a slider slidably connected to it. There are two Y-axis linear modules and two Y-axis columns, which are respectively fixedly installed on the left and right edges of the upper surface of the frame body. One end of each Y-axis column is fixedly installed on the slider of the Y-axis linear module, and the other end is fixedly connected to the X-axis column. The X-axis linear module is fixedly installed below the X-axis column. The Z-axis bracket is fixedly installed in the middle of the slider of the X-axis linear module. There are two Z-axis modules, which are respectively fixedly installed on both sides of the Z-axis bracket.

[0013] The fault repair unit includes a drill bit mechanism and a tapping mechanism, which are respectively fixedly installed on the sliders of two sets of Z-axis linear modules.

[0014] As a further description of the present invention, the energy meter positioning unit includes a connecting gear, an upper fixing buckle, a left fixing buckle, and a right fixing buckle. The connecting gear is rotatably connected inside the frame body. The lower end of the upper fixing buckle is provided with a toothed comb that meshes with the connecting gear. The toothed comb end of the upper fixing buckle is connected to the connecting gear and is close to the inner surface of the frame body. The left fixing buckle and the right fixing buckle have the same structure, with a toothed comb that meshes with the connecting gear at their upper or lower ends. The toothed comb ends of the left fixing buckle and the right fixing buckle are also connected to the gear and are located on the upper surface of the upper fixing buckle.

[0015] As a further description of the present invention, the drill bit mechanism includes a drill bit motor, a first torque sensor, and a drill bit. The drill bit motor is fixedly mounted on the slider of one of the Z-axis linear modules. The first torque sensor is connected to the drill bit motor, and the drill bit is connected to the drill bit motor through the first torque sensor.

[0016] The tapping mechanism includes a tapping motor, a second torque sensor, and a tapping head. The tapping motor is fixedly mounted on the slider of another set of Z-axis linear modules. The second torque sensor is connected to the tapping motor, and the tapping head is connected to the tapping motor through the second torque sensor.

[0017] As a further description of the present invention, the fault detection unit includes a camera mounting bracket, an industrial camera, an industrial lens, and an image processing module. The camera mounting bracket is fixedly installed on one end of the frame body near the fault repair unit. The industrial camera is fixedly installed on the camera mounting bracket. The industrial lens is connected to the industrial camera. The image processing module is installed in the background computer and analyzes the fault location and type based on the electricity meter terminal information collected by the industrial camera.

[0018] As a further description of the present invention, the camera mounting bracket includes a fixed column, an upper and lower adjustment column, an L-shaped connecting bracket, and an angle adjustment bracket. The fixed column is fixedly installed on the upper surface of the frame body, the upper and lower adjustment column is connected to the fixed column through the L-shaped connecting bracket, and the angle adjustment bracket is bolted to one side of the upper and lower adjustment column.

[0019] As a further description of the present invention, the camera mounting bracket also includes a light shield, which is fixedly connected to the angle adjustment bracket by bolts.

[0020] As a further description of the present invention, the X-axis linear module, Y-axis linear module, and Z-axis linear module have the same structure, including a fixed frame, a drive motor, a first coupling, a second coupling, a lead screw, a left support rod, a right support rod, and a slider. The drive motor is fixedly installed at one end of the fixed frame, and the output shaft of the drive motor is connected to one end of the first coupling. The other end of the first coupling is connected to one end of the lead screw, and the other end of the lead screw is connected to the second coupling. The second coupling is fixedly installed at the end of the fixed frame away from the drive motor. The left support rod and the right support rod are respectively fixedly installed on the fixed frame, located on both sides of the lead screw. The slider is slidably connected to the lead screw, and both sides of the slider are respectively sleeved on the left support rod and the right support rod.

[0021] As a further description of the invention, a debris cleaning unit is also included, which is mounted on the side of the Z-axis bracket.

[0022] As a further description of the present invention, the debris cleaning unit comprises a high-pressure air nozzle and an air pump. The air pump is connected to a power supply and a central control unit. The high-pressure air nozzle is connected to the air pump, and the outlet of the high-pressure air nozzle is vertically downward.

[0023] As a further description of the present invention, rubber pads are installed on the upper fixing buckle, the left fixing buckle, the right fixing buckle and the connection part of the electricity meter.

[0024] The beneficial effects of this invention are:

[0025] This invention discloses an intelligent repair device for electricity meter terminals. The device integrates an electricity meter positioning unit, a fault detection unit, a fault location unit, and a fault repair unit, all centrally coordinated and controlled by a central control unit. During actual maintenance, the device is placed on the electricity meter and clamped in place by the meter positioning unit. Subsequently, the fault location and repair units automatically perform visual detection and identification of terminal faults, three-dimensional spatial location of the fault location, and subsequent drilling and tapping repair operations. The entire process requires no manual intervention, achieving full automation from detection to repair, significantly reducing the repair time for a single electricity meter and greatly improving work efficiency compared to traditional manual repair methods.

[0026] This invention discloses an intelligent repair device for electricity meter terminals. The fault location unit employs a high-precision X, Y, and Z-axis linear module, coupled with a drive motor, to achieve micron-level repeatability. Simultaneously, the fault detection unit utilizes a high-resolution industrial camera and advanced image processing algorithms to accurately identify minute faults such as breakage, stripping, and corrosion of the terminals, and precisely calculate the center coordinates of the fault point. The repair unit (drill bit and tapping bit) is mounted on a high-precision Z-axis linear module, enabling precise vertical feeding. The combination of visual guidance and high-precision motion control ensures the positional accuracy and verticality of drilling and tapping operations, avoiding eccentricity, misalignment, or secondary damage caused by hand tremors or visual deviations during manual operation. This guarantees a high degree of consistency and reliability in the repair quality of each electricity meter terminal.

[0027] This invention discloses an intelligent repair device for electricity meter terminals. The drill and tapping mechanisms in the fault repair unit integrate a first torque sensor and a second torque sensor, respectively. During drilling and tapping, the central control unit monitors the feedback values ​​of the torque sensors in real time. When an abnormally increased torque is detected (e.g., the drill bit encounters a hard foreign object, chips clog during tapping, or the bottom hole depth is reached), the control system immediately issues a command to stop the feed of the corresponding motor or reverse it to exit, effectively preventing secondary damage such as drill bit or tap breakage, terminal breakage, or motor overload burnout caused by excessive torque. This intelligent torque control strategy not only protects the electricity meter itself and the repair tools but also significantly reduces the equipment failure rate and improves the safety of repair operations.

[0028] This invention discloses an intelligent repair device for electricity meter terminals. The electricity meter positioning unit employs a linkage toothed comb meshing structure with a connecting gear and three fixing buckles (upper fixing buckle, left fixing buckle, and right fixing buckle). When one of the fixing buckles (such as the upper fixing buckle) is pushed, the toothed comb at its lower end drives the connecting gear to rotate. The connecting gear then drives the left and right fixing buckles to move synchronously in opposite or the same direction, thereby achieving rapid, synchronous, and centered clamping of the electricity meter housing from above and from both sides. This mechanical linkage design, compared to using multiple independent cylinders or motors to drive it separately, is more compact, lower in cost, and eliminates the need for complex electrical synchronization control. Furthermore, it can accommodate electricity meters of different specifications within a certain size range, and centering and clamping can be completed in a single operation, making it extremely convenient to use. The rubber pads installed at the contact points between the fixing buckles and the electricity meter increase friction to prevent slippage and also provide cushioning protection, avoiding damage to the electricity meter housing. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an intelligent repair device for electricity meter terminals proposed in this invention.

[0030] Figure 2 This is a schematic diagram of the energy meter positioning unit structure of an intelligent repair device for energy meter terminals proposed in this invention.

[0031] Figure 3 This is a schematic diagram of the fault detection unit structure of an intelligent repair device for electricity meter terminals proposed in this invention.

[0032] Figure 4 This is a schematic diagram of the installation structure of the light shield of the intelligent repair device for the terminals of an electricity meter proposed in this invention.

[0033] Figure 5 This is a schematic diagram of the fault location unit structure of an intelligent repair device for electricity meter terminals proposed in this invention.

[0034] Figure 6This is a schematic diagram of the fault repair unit structure of an intelligent repair device for electricity meter terminals proposed in this invention.

[0035] Figure 7 This is a schematic diagram of the X / Y / Z linear module structure of an intelligent repair device for electricity meter terminals proposed in this invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Main frame.

[0038] 2. Electricity meter positioning unit; 21. Connecting gear; 22. Upper fixing buckle; 23. Left fixing buckle; 24. Right fixing buckle.

[0039] 3. Fault detection unit; 31. Camera mounting bracket; 311. Fixing column; 312. Up and down adjustment column; 313. L-shaped connecting bracket; 314. Angle adjustment bracket; 315. Sunshade; 32. Industrial camera; 33. Industrial lens.

[0040] 4. Fault location unit; 41. X-axis linear module; 411. Fixing frame; 412. Drive motor; 413. First coupling; 414. Second coupling; 415. Lead screw; 416. Left support rod; 417. Right support rod; 418. Slider; 42. Y-axis linear module; 43. Z-axis linear module; 44. X-axis column; 45. Y-axis column; 46. Z-axis bracket.

[0041] 5. Fault repair unit; 51. Drill bit mechanism; 511. Drill bit motor; 512. First torque sensor; 513. Drill bit; 52. Tapping mechanism; 521. Tapping motor; 522. Second torque sensor; 523. Tapping head. Detailed Implementation

[0042] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0043] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0044] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0045] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0046] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] like Figures 1-7 As shown, it illustrates a specific embodiment of the present invention:

[0049] Example 1:

[0050] A smart repair device for electricity meter terminals includes a frame body 1, an electricity meter positioning unit 2, a fault detection unit 3, a fault location unit 4, a fault repair unit 5, a central control unit, a power supply, and a communication unit. The frame body 1 is a cuboid structure with a hollow interior. The electricity meter positioning unit 2 is installed at the top of the frame body 1. The fault detection unit 3 is installed at the lower middle edge of the frame body 1. The fault location unit 4 is installed at the lower two side edges of the frame body 1. The fault repair unit 5 is installed on the fault location unit 4. The central control unit, power supply, and communication unit are installed inside the frame body 1. The fault detection unit 3, fault location unit 4, fault repair unit 5, and power supply are all connected to the central control unit.

[0051] In this embodiment, the main frame 1 is designed as a rectangular box with a hollow interior to house the central control unit, power module, communication module, and some drive circuits. The main frame 1 is constructed from high-strength aluminum alloy or stainless steel sheet, bent and welded, with anti-vibration pads installed at the four corners to ensure stability during operation. The upper surface of the main frame 1 is precision ground, with a flatness error controlled within 0.05mm, serving as the mounting reference surface for each motion axis.

[0052] The electricity meter positioning unit 2 is fixedly installed in the central area above the frame body 1. The function of this unit is to receive and clamp the electricity meter to be repaired, establish a unified spatial coordinate system reference, and ensure the consistency of the position of each electricity meter relative to the repair tool, thereby ensuring the accuracy of subsequent visual positioning and mechanical repair.

[0053] The fault detection unit 3 is installed above the frame body 1 near the edge, preferably on a side easily observed by the operator. Its core function is to collect image information of the electricity meter terminal area, analyze the current state of the terminals through image processing algorithms, determine whether there are faults such as bolt breakage, enlarged or deformed threaded holes, or foreign object blockage, and calculate the precise two-dimensional plane coordinates or three-dimensional spatial coordinates of the fault point.

[0054] The fault location unit 4 is installed on the upper two sides of the frame body 1. This unit spans above the energy meter location unit 2, forming a gantry-type three-axis motion platform. Its main function is to accurately move the fault repair unit 5 directly above the terminal to be repaired, based on the coordinate data provided by the fault detection unit 3.

[0055] The fault repair unit 5 is fixedly installed on the Z-axis end effector of the fault location unit 4. This unit integrates both drilling and tapping capabilities, and can sequentially perform drilling to remove residual bolts, hole enlargement correction, and re-tapping operations on damaged terminals under the command of the central control unit.

[0056] The central control unit, power supply, and communication unit are all encapsulated within the main frame 1. The central control unit is responsible for receiving sensor signals, running image processing algorithms, calculating motion trajectories, and issuing drive commands. The power supply unit provides a stable DC voltage to each motor, camera, and sensor. The communication unit is used for data interaction with the host computer or maintenance backend, uploading repair logs, etc.

[0057] Example 2:

[0058] Based on the above embodiment 1, this embodiment provides detailed specifications for the specific mechanical transmission structure of the fault location unit 4.

[0059] The fault location unit 4 includes an X-axis linear module 41, a Y-axis linear module 42, a Z-axis linear module 43, an X-axis column 44, a Y-axis column 45, and a Z-axis bracket 46. Each of the X-axis linear modules 41, 42, and 43 has a slider 418 slidably connected to it. There are two Y-axis linear modules 42 and two Y-axis columns 45, which are respectively fixedly installed on the left and right edges of the upper surface of the frame body 1. One end of the Y-axis column 45 is fixedly installed on the slider 418 of the Y-axis linear module 42, and the other end is fixedly connected to the X-axis column 44. The X-axis linear module 41 is fixedly installed below the X-axis column 44. The Z-axis bracket 46 is fixedly installed in the middle of the slider 418 of the X-axis linear module 41. There are two Z-axis modules 43, which are respectively fixedly installed on both sides of the Z-axis bracket 46.

[0060] In this embodiment, the fault location unit 4 is a precision three-axis Cartesian coordinate robot system, mainly composed of an X-axis linear module 41, a Y-axis linear module 42, a Z-axis linear module 43, an X-axis column 44, a Y-axis column 45, and a Z-axis support 46. Since the diameter of the electricity meter terminals is typically between M4 and M6, the repair process requires a positioning accuracy of 0.1mm. Therefore, this embodiment uses a high-precision ball screw linear module. The specific structural connection is as follows: two sets of Y-axis linear modules 42 and two sets of Y-axis columns 45 are symmetrically arranged and fastened to the left and right long edges of the upper surface of the frame body 1 with screws. The Y-axis linear modules 42 are laid along the length (front-back direction) of the frame body 1. Each Y-axis linear module 42 is slidably connected to a slider 418. The Y-axis column 45 is a vertically erected aluminum alloy profile or cast iron column, and its bottom is fixedly mounted on the slider 418 of the Y-axis linear module 42 via an adapter plate. When the Y-axis drive motor operates, the two Y-axis columns 45 will move synchronously back and forth. The X-axis column 44 is a horizontal beam that spans and connects the tops of the left and right Y-axis columns 45, and is rigidly fixed with bolts. Thus, the X-axis column 44 is suspended directly above the working area. The X-axis linear module 41 is fixedly mounted below the front side (facing the operator) of the X-axis column 44. The slider 418 of the X-axis linear module 41 can move horizontally in the left and right directions. The Z-axis bracket 46 is an L-shaped or T-shaped connecting plate, one end of which is fixed to the middle of the slider 418 of the X-axis linear module 41. Two sets of Z-axis linear modules 43 are provided, and are respectively fixedly mounted vertically downward on the left and right sides of the Z-axis bracket 46. The purpose of this design is to simultaneously mount the drill bit mechanism and the tapping mechanism within a limited lateral space, so that the device can continuously complete the two processes of drilling and tapping without changing the cutting tools, thus greatly improving work efficiency.

[0061] Specifically, the X-axis linear module 41, Y-axis linear module 42, and Z-axis linear module 43 have the same structure, including a fixed frame 411, a drive motor 412, a first coupling 413, a second coupling 414, a lead screw 415, a left support rod 416, a right support rod 417, and a slider 418. The drive motor 412 is fixedly installed at one end of the fixed frame 411, and the output shaft of the drive motor 412 is connected to one end of the first coupling 413. The other end is connected to one end of the lead screw 415, and the other end of the lead screw 415 is connected to the second coupling 414. The second coupling 414 is fixedly installed on the end of the fixed frame 411 away from the drive motor 412. The left support rod 416 and the right support rod 417 are respectively fixedly installed on the fixed frame 411, located on both sides of the lead screw 415. The slider 418 is slidably connected to the lead screw 415, and the two sides of the slider 415 are respectively sleeved on the left support rod 416 and the right support rod 417.

[0062] In this embodiment, although the lengths and installation postures of the X, Y, and Z axes differ, the core transmission components of the linear modules share the same structure. Each linear module includes: a mounting frame 411, a drive motor 412, a first coupling 413, a second coupling 414, a lead screw 415, a left support rod 416, a right support rod 417, and a slider 418. The mounting frame 411 is a long strip of aluminum profile with internal channels to accommodate the lead screw and guide rail. The drive motor 412 is a closed-loop stepper motor or AC servo motor with an encoder, fixedly mounted on one end flange of the mounting frame 411. The output shaft of the drive motor 412 is rigidly connected to one end of the lead screw 415 via the first coupling 413. The first coupling 413 and the second coupling 414 are preferably diaphragm-type elastic couplings, which can compensate for minor axial misalignment errors during installation and absorb vibration. The lead screw 415 is a ground precision ball screw, typically designed with a lead of 5mm or 10mm to ensure both movement speed and resolution. The other end of the lead screw 415 is connected to a second coupling 414, which is fixedly mounted on a bearing seat at the tail end of the fixed frame 411, providing support. To enhance the guiding rigidity and torsional resistance of the slider, this embodiment features a left support rod 416 and a right support rod 417 arranged parallel to each other on both sides of the lead screw 415. These two support rods serve as both optical axis guides and sliding support rods for the slider. A ball nut that mates with the lead screw 415 is embedded in the center of the slider 418. Through holes are opened on both sides of the slider 418, with linear bearings or sliding bushings installed inside, fitted onto the left support rod 416 and the right support rod 417. When the drive motor 412 rotates, the lead screw 415 rotates, driving the slider 418 to perform high-precision linear motion along the left and right support rods.

[0063] Through the above-mentioned X, Y, and Z axis linkage, the repair tool located at the end of the Z axis can reach any point in the workspace, providing a mechanical basis for achieving precise repair.

[0064] Example 3:

[0065] In this embodiment, the specific composition and working principle of the fault repair unit 5 are further defined.

[0066] The fault repair unit 5 includes a drill bit mechanism 51 and a tapping mechanism 52, which are respectively fixedly installed on the sliders of two sets of Z-axis linear modules 43.

[0067] Specifically, the drill bit mechanism 51 includes a drill bit motor 511, a first torque sensor 512, and a drill bit 513. The drill bit motor 511 is fixedly mounted on the slider 418 of one of the Z-axis linear modules 43. The first torque sensor 512 is connected to the drill bit motor 511. The drill bit 513 is connected to the drill bit motor 511 through the first torque sensor 512.

[0068] The tapping mechanism 52 includes a tapping motor 521, a second torque sensor 522, and a tapping head 523. The tapping motor 521 is fixedly mounted on the slider 418 of another set of Z-axis linear modules 43. The second torque sensor 522 is connected to the tapping motor 521, and the tapping head 523 is connected to the tapping motor 521 through the second torque sensor 522.

[0069] In this embodiment, when faced with a fault such as a broken M4 or M5 bolt or a damaged thread inside the terminal block, the repair process typically includes two key stages: first, drilling away the original broken bolt or enlarging the pilot hole; and second, re-tapping the standard thread. Therefore, this embodiment subdivides the fault repair unit 5 into a drill mechanism 51 and a tapping mechanism 52.

[0070] The drill bit mechanism 51 is responsible for rough machining, used to drill and remove faulty metal residue. It is mounted on the slider 418 of one of the Z-axis linear modules 43 (e.g., the left Z-axis). This mechanism includes: a drill bit motor 511, a first torque sensor 512, and a drill bit 513. The drill bit motor 511 is a high-speed DC brushless motor or a small high-speed spindle motor, and its housing is fixed to the Z-axis slider 418 via a motor mount. The first torque sensor 512 is mounted at the front end of the output shaft of the drill bit motor 511. This sensor is a strain gauge type dynamic torque sensor, which can monitor torque changes in real time during the drilling process. The torque signal is fed back to the central control unit in real time to determine whether the drill bit is in contact with metal (very low idling torque), whether it is about to drill through (sharp drop in torque), or whether it has stalled (torque exceeding the limit). Once an abnormal torque is detected, the central control unit will immediately stop the Z-axis feed or reverse the retraction to prevent the drill bit from breaking or damaging the internal PCB board of the meter. The drill bit 513 is mounted on the other end of the first torque sensor 512 via a spring chuck or a precision drill chuck. The diameter of drill bit 513 is preset according to the specifications of the terminal to be repaired. For example, for M4 thread repair, a twist drill with a diameter of 3.2mm or 3.3mm is usually used as the pilot hole drill bit.

[0071] The tapping mechanism 52 is responsible for finishing, used to tap new threads in the drilled pilot hole. It is mounted on the slider 418 of another set of Z-axis linear modules 43 (e.g., the right Z-axis). This mechanism includes: a tapping motor 521, a second torque sensor 522, and a tapping head 523. The tapping motor 521 needs to have precise low-speed, high-torque control capability and rapid reversal capability, preferably a servo motor with an encoder, to cooperate with the tap lead to achieve synchronous feed (rigid tapping) or use a floating tapping chuck. The second torque sensor 522 is connected between the tapping motor 521 and the tapping head 523. The torque changes during the tapping process are more complex. The central control unit can accurately identify the stages such as tap entry, tapping stabilization, and tap withdrawal by analyzing the torque waveform. When a sharp increase in torque is detected exceeding the safety threshold (such as encountering a hard point or tap wear), the system will perform a protective reversal to prevent the tap from breaking inside the workpiece and causing irreparable consequences. The tapping head 523 uses a special tapping chuck with overload protection to hold machine taps of the corresponding specifications (such as M4*0.7 or M5*0.8).

[0072] In this embodiment, during the actual repair of the electricity meter terminals, the central control unit first controls the movement of the Y and X axes to align the drill bit mechanism 51 with the fault coordinates. The Z axis moves downwards, and the drill bit 513 rotates at high speed to cut. After drilling to the predetermined depth, the Z axis retracts. Subsequently, the X axis moves by a fixed offset distance (i.e., the distance between the left and right Z axis modules) to align the tapping mechanism 52 with the same hole coordinates. The Z axis moves downwards again, and the tapping head 523 rotates clockwise to tap, reversing to withdraw after reaching the depth. The entire process requires no manual tool changing, improving repair efficiency.

[0073] Example 4:

[0074] Due to the wide variety of electricity meter models and differences in casing dimensions, this embodiment provides an electricity meter positioning unit 2 with a linkage self-centering structure to accommodate different specifications of electricity meters while ensuring that the center position of the clamping is fixed relative to the frame body 1 each time.

[0075] Specifically, the energy meter positioning unit 2 includes a connecting gear 21, an upper fixing buckle 22, a left fixing buckle 23, and a right fixing buckle 24. The connecting gear 21 is rotatably connected inside the frame body 1. The lower end of the upper fixing buckle 22 is provided with a toothed comb that meshes with the connecting gear. The toothed comb end of the upper fixing buckle 22 is connected to the connecting gear 21 and is close to the inner surface of the frame body 1. The left fixing buckle 23 and the right fixing buckle 24 have the same structure. Their upper or lower ends are provided with toothed combs that mesh with the connecting gear 21. The toothed comb ends of the left fixing buckle 23 and the right fixing buckle 24 are both connected to the connecting gear 21 and are located on the upper surface of the upper fixing buckle 22.

[0076] In this embodiment, the connecting gear 21 is a spur gear, rotatably connected to the inside of the frame body 1 near the upper surface via bearings and a rotating shaft. This connecting gear 21 serves as a linkage hub and can rotate freely. The upper fixing buckle 22 is an L-shaped or flat pressure block used to press down on the top edge of the energy meter from above. The lower end of the upper fixing buckle 22 (the part extending into the frame) is machined with a rack structure (i.e., a toothed comb) with the same module as the connecting gear 21. This toothed comb end meshes with the upper part of the connecting gear 21. The main body of the upper fixing buckle 22 slides vertically against the inner surface of the frame body 1 and is constrained by an external limiting groove, allowing only linear movement in the up-down direction. The left fixing buckle 23 is used to press against the left side of the energy meter, and the right fixing buckle 24 is used to press against the right side of the energy meter. The left fixing buckle 23 and the right fixing buckle 24 have the same structure but are installed in opposite directions. Taking the left fixing buckle 23 as an example, it also has a rack structure, but the installation method is as follows: if the left fixing buckle 23 is located below the connecting gear 21, its comb end faces upward and meshes with the lower part of the connecting gear 21; if in order to save space, the racks of the left and right fixing buckles can also be stacked and linked with the connecting gear 21 through different meshing layers.

[0077] In this embodiment, when the electricity meter is clamped, the upper fixing buckle 22 is manually or driven downward by a small cylinder. The rack of the upper fixing buckle 22 drives the connecting gear 21 to rotate clockwise. The rotating connecting gear 21 simultaneously drives the rack of the left fixing buckle 23, which meshes with it, to move to the right, and drives the rack of the right fixing buckle 24 to move to the left. Therefore, as the upper fixing buckle 22 is pressed down, the left and right fixing buckles retract towards the center. As long as the upper fixing buckle 22 continues to press down, the left and right fixing buckles will synchronously and equidistantly clamp both sides of the electricity meter, thereby ensuring that the geometric center in the left-right direction remains unchanged regardless of the width of the electricity meter.

[0078] To achieve vertical positioning, a front positioning block can be installed on the platform of the main frame 1. When the energy meter is pushed in and abuts against the front block, the upper fixing buckle 22 is activated to press down, and the left and right fixing buckles clamp simultaneously, completing the positioning of the energy meter.

[0079] Example 5:

[0080] Specifically, the fault detection unit 3 includes a camera mounting bracket 31, an industrial camera 32, an industrial lens 33, and an image processing module. The camera mounting bracket 31 is fixedly installed on one end of the frame body 1 near the fault repair unit 5. The industrial camera 32 is fixedly installed on the camera mounting bracket 31. The industrial lens 33 is connected to the industrial camera 32. The image processing module is installed in the background computer and analyzes the fault location and type based on the electricity meter terminal information collected by the industrial camera.

[0081] Specifically, the camera mounting bracket 31 includes a fixed column 311, an up-and-down adjustment column 312, an L-shaped connecting bracket 313, and an angle adjustment bracket 314. The fixed column 311 is fixedly installed on the upper surface of the frame body 1. The up-and-down adjustment column 312 is connected to the fixed column 311 through the L-shaped connecting bracket 313. The angle adjustment bracket 314 is bolted to one side of the up-and-down adjustment column 312.

[0082] Specifically, the camera mounting bracket 31 also includes a light shield 315, which is fixedly connected to the angle adjustment bracket 314 by bolts.

[0083] In this embodiment, to accommodate the potential angle differences between different energy meters and terminals, the camera mounting bracket 31 is designed with a multi-degree-of-freedom adjustment function. The fixed column 311 is a solid column vertically mounted on the edge of the upper surface of the frame body 1. The upper and lower adjustment columns 312 are connected by an L-shaped connecting bracket 313. Loosening the bolts on the L-shaped connecting bracket 313 allows for manual adjustment of the installation height of the upper and lower adjustment columns 312. The angle adjustment bracket 314 is an adapter plate with an arc groove. It is bolted to one side of the upper and lower adjustment columns 312. By loosening the bolts, the angle adjustment bracket 314 can be rotated around the bolt axis by a certain angle (e.g., ±15 degrees), adjusting the pitch angle of the industrial camera 32 to ensure that the shooting optical axis is as perpendicular as possible to the terminal end face, reducing the impact of perspective distortion on the accuracy of visual measurement.

[0084] In this embodiment, considering the complex lighting environment in substations or power distribution rooms, with strong light and shadow interference, the light shield 315 is fixedly connected to the angle adjustment bracket 314 by bolts, forming a semi-enclosed structure covering the top and sides of the industrial camera 32 and industrial lens 33. The inner wall of the light shield 315 is coated with a black matte light-absorbing paint, effectively reducing stray light from the environment entering the lens. Furthermore, preferably, the light shield 315 also integrates a ring-shaped LED supplementary light, providing stable and uniform front lighting and highlighting the textured features within the terminal screw holes.

[0085] In this embodiment, the industrial camera 32 is a CMOS monochrome or color industrial camera with at least 5 megapixels, connected to the central control unit via a gigabit Ethernet or USB 3.0 interface. The industrial lens 33 is a low-distortion fixed-focus lens, and its installation height ensures that the field of view covers the entire terminal block area of ​​the electricity meter. The image processing module incorporates a software logic combining deep learning and traditional image algorithms. The specific working process is as follows: First, the camera captures a global image, and the template matching algorithm is used to find the border features of the electricity meter terminal block, establishing a coarse positioning coordinate system. Next, the region of interest (ROI) image of each terminal is captured. Within the ROI, the algorithm performs edge detection and roundness fitting. If a large area of ​​bright reflection (broken metal cross-section) is detected in the center of the circular area, and the edges are incomplete, it is determined that the bolt is broken. If the inner wall edge of the screw hole is jagged and discontinuous, or the roundness error exceeds a preset threshold, it is determined that the thread is stripped. If the gray value inside the hole is abnormally low (black shadow) and the texture is messy, it is determined that there are foreign objects or carbon deposits. This image processing module not only identifies the fault type, but more importantly, it calculates the precise coordinates of the fault center. Through the prior hand-eye calibration (Eye-in-Hand or Eye-to-Hand system calibration) of the camera, the image processing module can convert the hole center coordinates (u, v) in the pixel coordinate system into physical coordinates (X, Y) in the robotic arm motion coordinate system, and send these coordinates to the fault location unit 4 as the target position command.

[0086] Example 6:

[0087] During drilling and tapping, a large amount of copper debris is inevitably generated. If this conductive debris falls onto the PCB circuit board inside the electricity meter, it can easily cause a short circuit, leading to secondary malfunctions. Therefore, this embodiment specifically includes a debris cleaning unit.

[0088] Specifically, it also includes a debris cleaning unit, which is installed on the side of the Z-axis bracket 46.

[0089] Specifically, the debris cleaning unit comprises a high-pressure air nozzle and an air pump. The air pump is connected to a power supply and a central control unit. The high-pressure air nozzle is connected to the air pump, and the outlet of the high-pressure air nozzle is vertically downward.

[0090] In this embodiment, the debris cleaning unit is mounted and fixed on the side of the Z-axis bracket 46, moving with the X and Y axes to ensure it always follows the machining point. This unit mainly consists of a high-pressure air nozzle and a miniature air pump or an external air source solenoid valve. The miniature air pump is installed inside the main frame 1 and connected to the high-pressure air nozzle via an air pipe. The start and stop of the air pump are controlled by a central control unit via a relay. The high-pressure air nozzle is a flat or cylindrical copper nozzle, fixedly mounted on a universal joint tube or rigid bracket. Its outlet position is precisely aligned with the tip of the drill bit 513 or tapping head 523, and the spray direction is angled downwards at a certain angle.

[0091] In this embodiment, the working process is as follows: When the drill bit mechanism 51 begins drilling, the central control unit simultaneously starts the air pump. High-pressure airflow is ejected from the air nozzle, instantly blowing the spiral copper chips generated during drilling away from the workpiece surface, preventing the chips from getting tangled on the drill bit or falling into the gaps in the watch case. The air pump also remains on while the tapping mechanism 52 is working. Since the chips generated during the tapping process are mostly fine powder, the high-pressure airflow can effectively disperse and expel them. Specifically, at the moment the drill bit 513 completes drilling and begins to withdraw, the system performs a pulsed, strong airflow to thoroughly remove any residual copper chips from the bottom hole, ensuring that the tap will not be crushed due to chips at the bottom during subsequent tapping. The introduction of this unit greatly improves the success rate and safety of repairs and is a key technology for achieving non-disassembly online repair.

[0092] Based on all the above embodiments, the complete intelligent repair operation process of this device is as follows:

[0093] Step 1: System Initialization and Self-Test

[0094] The device is powered on, and the central control unit starts. The Y-axis, X-axis, and Z-axis linear modules perform a homing action, locate the photoelectric limit switches of each axis, and establish the mechanical origin coordinate system. The industrial camera 32 warms up, and the communication unit establishes a connection with the backend.

[0095] Step 2: Workpiece clamping

[0096] The operator places the energy meter to be repaired on the table of the main frame 1 and pushes it to the positioning block. The energy meter positioning unit 2 (manual pressure rod or electric push rod) is activated, causing the upper fixing buckle 22 to move downwards, simultaneously clamping the left and right fixing buckles 23 and 24 in a concentric manner. The clamping sensor sends a signal to confirm that the workpiece is fixed.

[0097] Step 3: Initial Visual Inspection and Fault Location

[0098] The fault location unit 4 moves, bringing the industrial camera 32 to a preset position above the power meter terminal block. The industrial camera 32 captures a global image, and the image processing module runs a recognition algorithm to analyze the status of each of the N terminals (e.g., 8 terminals). If a bolt breakage is detected in terminal number 3, the system generates an alarm message and displays it on the interface, while simultaneously calculating the mechanical coordinates (X3, Y3) of the center of terminal number 3.

[0099] Step 4: Drilling Repair Operation

[0100] The central control unit plans the path, driving the Y and X axes to precisely move the drill bit mechanism 51 (left Z-axis) directly above coordinates (X3, Y3). The Z-axis linear module 43 drives the drill bit motor 511 downwards at a set speed. The first torque sensor 512 monitors the resistance in real time. The drill bit 513 contacts the end face of the broken bolt, and the torque increases. During drilling, the central control unit executes a "pecking" cycle: feed 1mm, quickly retract 0.5mm to facilitate chip breaking and cooling. The chip cleaning unit is activated simultaneously, and high-pressure air nozzles blow away copper chips. After drilling to the predetermined depth (preset according to the meter model), the Z-axis quickly returns to the origin.

[0101] Step 5: Tapping and Repair Operation

[0102] After the drill bit mechanism 51 retracts, the X-axis linear module 41 moves laterally by a fixed offset, switching the tapping mechanism 52 (right Z-axis) to directly above coordinates (X3, Y3). The tapping motor 521 rotates forward at low speed, and the Z-axis feeds synchronously according to the lead. The second torque sensor 522 monitors the tapping torque curve. Tap entry section: torque rises smoothly. Cutting section: torque stabilizes within the normal range. If a sudden torque change occurs, the mechanism immediately reverses and retracts, attempting a second tapping attempt or triggering an alarm to replace the tap. Upon reaching the bottom of the hole, the motor immediately reverses, and the tap is unscrewed. The chip removal unit uses strong airflow to blow away debris as the tap retracts.

[0103] Step 6: Re-inspection and Completion

[0104] After all marked fault points have been repaired, fault location unit 4 moves the camera again for visual re-inspection. The system checks whether the edge of the screw hole is intact and whether there are any new thread marks. After confirming that the repair is qualified, the electricity meter positioning unit 2 is released, and the operator takes away the repaired electricity meter. The device automatically generates an electronic work order containing before and after repair comparison photos and processing parameters (drilling speed, peak torque), which is uploaded to the asset management system via the communication unit.

[0105] This device achieves full automation from visual recognition and coordinate calculation to machining, requiring no manual intervention and reducing the skill requirements for maintenance personnel. Utilizing a three-axis gantry structure with screw-guided drive and a closed-loop control motor, it achieves micron-level positioning accuracy, meeting the repair needs of small threads. An integrated dual-torque sensor monitoring mechanism can detect abnormal conditions such as drill bit wear and tap jamming in real time, automatically shutting down for protection, greatly reducing the risk of tool breakage and secondary damage to instruments. The vision system is equipped with a multi-degree-of-freedom adjustable bracket and a light-blocking and supplemental lighting device, enabling stable acquisition of clear images even in complex lighting conditions. It features real-time debris cleaning, avoiding short-circuit hazards caused by copper shavings residue, and its compact size makes it easy to carry to the field.

[0106] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention. For example, changing the driving method of the linear module to synchronous belt drive to reduce costs, adding a laser rangefinder to assist Z-axis positioning, and adding a lubricating oil spray device to assist tapping, etc., all of which fall within the scope of protection of the present invention.

[0107] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0108] Many other changes and modifications can be made without departing from the concept and scope of this invention. It should be understood that this invention is not limited to the specific embodiments, and the scope of this invention is defined by the appended claims.

Claims

1. A smart repair device for electricity meter terminals, characterized in that, The device includes a main frame (1), an energy meter positioning unit (2), a fault detection unit (3), a fault location unit (4), a fault repair unit (5), a central control unit, a power supply, and a communication unit. The main frame (1) is a cuboid structure with a hollow interior. The energy meter positioning unit (2) is installed on the top of the main frame (1). The fault detection unit (3) is installed at the middle edge of the bottom of the main frame (1). The fault location unit (4) is installed at the two sides of the bottom of the main frame (1). The fault repair unit (5) is installed on the fault location unit (4). The central control unit, power supply, and communication unit are installed inside the main frame (1). The fault detection unit (3), the fault location unit (4), the fault repair unit (5), and the power supply are all connected to the central control unit. The fault location unit (4) includes an X-axis linear module (41), a Y-axis linear module (42), a Z-axis linear module (43), an X-axis column (44), a Y-axis column (45), and a Z-axis bracket (46). Each of the X-axis linear module (41), Y-axis module (42), and Z-axis module (43) is slidably connected to a slider (418). There are two Y-axis linear modules (42) and two Y-axis columns (45), which are respectively fixedly installed on the left and right sides of the upper surface of the frame body (1). At the two side edges, one end of the Y-axis column (45) is fixedly installed on the slider (418) of the Y-axis linear module (42), and the other end is fixedly connected to the X-axis column (44). The X-axis linear module (41) is fixedly installed below the X-axis column (44). The Z-axis bracket (46) is fixedly installed in the middle of the slider (418) of the X-axis linear module (41). There are two Z-axis linear modules (43), which are fixedly installed on both sides of the Z-axis bracket (46). The fault repair unit (5) includes a drill bit mechanism (51) and a tapping mechanism (52), which are respectively fixedly installed on the sliders of two sets of Z-axis linear modules (43).

2. The intelligent repair device for electricity meter terminals according to claim 1, characterized in that, The energy meter positioning unit (2) includes a connecting gear (21), an upper fixing buckle (22), a left fixing buckle (23), and a right fixing buckle (24). The connecting gear (21) is rotatably connected inside the frame body (1). The lower end of the upper fixing buckle (22) is provided with a toothed comb that meshes with the connecting gear. The toothed comb end of the upper fixing buckle (22) is connected to the connecting gear (21) and closely attached to the inner surface of the frame body (1). The left fixing buckle (23) and the right fixing buckle (24) have the same structure. The upper end or the lower end of the left fixing buckle (23) is provided with a toothed comb that meshes with the connecting gear (21). The toothed comb ends of the left fixing buckle (23) and the right fixing buckle (24) are both connected to the connecting gear (21) and located on the upper surface of the upper fixing buckle (22).

3. The intelligent repair device for electricity meter terminals according to claim 1, characterized in that, The drill bit mechanism (51) includes a drill bit motor (511), a first torque sensor (512), and a drill bit (513). The drill bit motor (511) is fixedly mounted on the slider (418) of one of the Z-axis linear modules (43). The first torque sensor (512) is connected to the drill bit motor (511). The drill bit (513) is connected to the drill bit motor (511) through the first torque sensor (512). The tapping mechanism (52) includes a tapping motor (521), a second torque sensor (522), and a tapping head (523). The tapping motor (521) is fixedly mounted on the slider (418) of another set of Z-axis linear modules (43). The second torque sensor (522) is connected to the tapping motor (521). The tapping head (523) is connected to the tapping motor (521) through the second torque sensor (522).

4. The intelligent repair device for electricity meter terminals according to claim 1, characterized in that, The fault detection unit (3) includes a camera mounting bracket (31), an industrial camera (32), an industrial lens (33), and an image processing module. The camera mounting bracket (31) is fixedly installed on one end of the frame body (1) near the fault repair unit (5). The industrial camera (32) is fixedly installed on the camera mounting bracket (31). The industrial lens (33) is connected to the industrial camera (32). The image processing module is installed in the background computer and analyzes the fault location and type based on the electricity meter terminal information collected by the industrial camera.

5. The intelligent repair device for electricity meter terminals according to claim 4, characterized in that, The camera mounting bracket (31) includes a fixed column (311), an up-and-down adjustment column (312), an L-shaped connecting bracket (313), and an angle adjustment bracket (314). The fixed column (311) is fixedly installed on the upper surface of the frame body (1). The up-and-down adjustment column (312) is connected to the fixed column (311) through the L-shaped connecting bracket (313). The angle adjustment bracket (314) is bolted to one side of the up-and-down adjustment column (312).

6. The intelligent repair device for electricity meter terminals according to claim 5, characterized in that, The camera mounting bracket (31) also includes a light shield (315), which is fixedly connected to the angle adjustment bracket (314) by bolts.

7. The intelligent repair device for electricity meter terminals according to claim 1, characterized in that, The X-axis linear module (41), Y-axis linear module (42), and Z-axis linear module (43) have the same structure, including a fixed frame (411), a drive motor (412), a first coupling (413), a second coupling (414), a lead screw (415), a left support rod (416), a right support rod (417), and a slider (418). The drive motor (412) is fixedly installed at one end of the fixed frame (411), and the output shaft of the drive motor (412) is connected to one end of the first coupling (413). One end is connected to one end of the lead screw (415), and the other end of the lead screw (415) is connected to the second coupling (414). The second coupling (414) is fixedly installed on the end of the fixed frame (411) away from the drive motor (412). The left support rod (416) and the right support rod (417) are respectively fixedly installed on the fixed frame (411) and located on both sides of the lead screw (415). The slider (418) is slidably connected to the lead screw (415), and the two sides of the slider (415) are respectively sleeved on the left support rod (416) and the right support rod (417).

8. The intelligent repair device for electricity meter terminals according to claim 1, characterized in that, It also includes a debris cleaning unit, which is mounted on the side of the Z-axis bracket (46).

9. The intelligent repair device for electricity meter terminals according to claim 8, characterized in that, The debris cleaning unit consists of a high-pressure air nozzle and an air pump. The air pump is connected to a power supply and a central control unit. The high-pressure air nozzle is connected to the air pump, and the outlet of the high-pressure air nozzle is vertically downward.

10. The intelligent repair device for electricity meter terminals according to claim 2, characterized in that, Rubber pads are installed on the upper fixing buckle (22), left fixing buckle (23), right fixing buckle (24) and the part connecting them to the electricity meter.

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