Damp-proof electric meter box for intelligent electric meter

Abstract

The invention relates to the technical field of electric meter boxes, and discloses a moisture-proof electric meter box for an intelligent electric meter, which comprises an electric meter box main body, a shell is arranged in the electric meter box main body, a line protection mechanism is arranged in the shell, and the line protection mechanism comprises a first fuse holder, a second fuse holder and a fuse; a plurality of fuses are arranged, one of the fuses is arranged between the first fuse seat and the second fuse seat as a main fuse, and the other fuses are used as standby fuses; a replacement mechanism is further arranged in the shell and comprises a rotating disc, a plurality of bearing assemblies are installed on the rotating disc in an equidistant circumferential array mode, and the fuses are installed on the bearing assemblies respectively. According to the moisture-proof electric meter box for the intelligent electric meter, after the fuses are fused due to line protection, mechanical devices in the electric meter box can be intelligently triggered, the fused fuses are automatically detached, and standby fuses are installed.

Description

Technical Field

[0001] The invention relates to the technical field of electric meter boxes, in particular to a moisture-proof electric meter box for a smart electric meter. Background Art

[0002] The meter box is a device used to store electric meters. The meter box not only measures electric energy, but also protects the equipment. When the current is overloaded or short-circuited, the meter box will detect the problem in time and cut off the power supply, thus avoiding accidents.

[0003] Commonly used protective devices include air switches, fuses, etc. Among them, fuses are one of the most commonly used protective devices. The principle is that when the current exceeds the specified value, the heat generated by the fuse itself causes the fuse to melt and disconnect the circuit.

[0004] In the prior art, when a fuse is blown due to line protection, it is usually necessary to replace it manually. Manual replacement has certain safety risks, and before the fuse is replaced, the meter box is in a power-off state, and a long interruption time will cause great inconvenience to production and life.

[0005] Therefore, in order to solve the above technical problems existing in the prior art, a moisture-proof meter box for a smart meter is proposed. Summary of the invention

[0006] The present invention provides a moisture-proof meter box for a smart meter, which has the beneficial effect of being able to intelligently trigger a mechanical device in the meter box to automatically remove the blown fuse and install a spare fuse after the fuse is blown due to line protection, thereby solving the problem mentioned in the above background technology that when the fuse is blown due to line protection, it is usually necessary to manually replace it, which not only has certain safety risks, but also the meter box is in a power-off and non-working state before the fuse is replaced, and the long interruption time will cause great inconvenience to production and life.

[0007] The present invention provides the following technical solution: a moisture-proof meter box for a smart meter, comprising a meter box body, a shell is arranged inside the meter box body, a line protection mechanism is arranged inside the shell, and the line protection mechanism comprises a first fuse holder, a second fuse holder and a fuse; There are a plurality of fuses, one of which is installed between the first fuse holder and the second fuse holder as a main fuse, and the remaining fuses are used as backup fuses; A replacement mechanism is also provided in the housing, and the replacement mechanism comprises a turntable, on which a plurality of bearing assemblies are mounted in the form of an equidistant circular array, and a plurality of the fuses are mounted on a plurality of the bearing assemblies respectively; The replacement mechanism also includes a trigger component. When the main fuse is blown, the trigger component drives the turntable to rotate to replace the main fuse with a spare fuse.

[0008] As an optional solution of the moisture-proof meter box for the smart meter of the present invention, wherein: the line protection mechanism includes two first slide grooves symmetrically opened in the housing, and the first fuse holder and the second fuse holder are slidably connected in the two first slide grooves respectively; The first fuse holder is provided with a first negative wire and a slot, the second fuse holder is provided with a first positive wire and an insert block, and the slot is adapted to the insert block; The replacement mechanism further includes a motor and a power supply assembly, wherein the motor is disposed in the housing, and an output shaft of the motor is connected to the rotating disk; The trigger component is operated to trigger the power supply component to supply power to the motor, thereby driving the turntable to rotate through the motor.

[0009] As an optional solution of the moisture-proof meter box for the smart meter described in the present invention, the line protection mechanism also includes an installation component, the installation component includes a fixed seat arranged in the shell, a second slide groove is opened on the fixed seat, a slider is slidably arranged in the second slide groove, and the slider is elastically connected to the fixed seat through a first spring.

[0010] As an optional solution of the moisture-proof meter box for the smart meter described in the present invention, wherein: a connecting shaft is provided on the slider, a first connecting seat is provided on the first fuse seat and the second fuse seat, and the mounting assembly also includes two first connecting rods, one end of the two first connecting rods are rotatably connected to the connecting shaft, and the other ends of the two first connecting rods are respectively rotatably connected to the two first connecting seats.

[0011] As an optional solution of the moisture-proof meter box for the smart meter of the present invention, wherein: the bearing assembly includes a mounting seat arranged on the turntable, two third slide grooves are symmetrically provided on the mounting seat, and mounting plates are slidably arranged in the two third slide grooves, the fuse is installed on the two mounting plates, and the two mounting plates are elastically connected to the mounting seat through two second springs respectively; When the main fuse is blown, the first fuse holder and the second fuse holder are pulled to move away from each other by the elastic force of the two second springs, so that the sliding block rises.

[0012] As an optional solution for the moisture-proof meter box for the smart meter described in the present invention, the power supply component includes a second negative pole wire arranged on the motor, an insulating plate is slidably arranged in the shell, the insulating plate is elastically connected to the shell through a third spring, a first power connection post is arranged on the insulating plate, a second positive pole wire is arranged on the first power connection post, and a second power connection post is arranged on the motor.

[0013] As an optional solution of the moisture-proof meter box for the smart meter described in the present invention, the trigger component includes a fourth slide groove opened on the mounting seat, a first trapezoidal block is arranged on the slider, the first trapezoidal block is slidably connected in the fourth slide groove, a fifth slide groove is also opened on the mounting seat, a second trapezoidal block is slidably arranged in the fifth slide groove, and the first trapezoidal block fits with the second trapezoidal block.

[0014] As an optional solution of the moisture-proof meter box for the smart meter of the present invention, wherein: the insulating plate and the second trapezoidal block are both provided with a second connection seat, a rotating rod is rotatably provided in the housing, a second connecting rod is provided on the rotating rod, and both ends of the second connecting rod are rotatably connected to the two second connection seats respectively; When the main fuse is blown, the slider and the first trapezoidal block rise to drive the second trapezoidal block to move backward, so that the first power connection post and the second power connection post are connected to power the motor.

[0015] As an optional solution of the moisture-proof meter box for the smart meter of the present invention, wherein: the replacement mechanism further includes a support assembly, the support assembly includes a first arc groove and a second arc groove opened on the mounting seat, the first arc groove is connected to the fourth slide groove, the second arc groove is connected to the fifth slide groove, and the mounting seat is provided with a first arc plate and a second arc plate; When the turntable rotates, the first arc plate and the second arc plate are used to hold the first trapezoidal block and the second trapezoidal block respectively, so as to maintain the motor being energized.

[0016] As an optional solution of the moisture-proof meter box for the smart meter of the present invention, a ventilation hole is opened on the main body of the meter box, and an exhaust fan is installed in the main body of the meter box.

[0017] The present invention has the following beneficial effects: 1. The moisture-proof meter box for the smart meter has multiple fuses installed on the turntable inside the box as backup. When the main fuse blows due to a short circuit or other line fault, the installation component will automatically operate, so that the first fuse holder and the second fuse holder at both ends of the fuse are opened to reserve space for installing a new fuse. At the same time, the operation of the installation component will further operate the trigger component, and the trigger component will trigger the power supply component to energize the motor installed in the main body of the meter box. The motor drives the turntable to rotate, so that the blown fuse is pulled out from the first fuse holder and the second fuse holder, and a new fuse is moved between the first fuse holder and the second fuse holder. Then the first fuse holder and the second fuse holder automatically dock with the new fuse to complete the intelligent replacement of the fuse. It can avoid manual replacement of fuses and restore the operation of the main body of the meter box in time.

[0018] 2. The moisture-proof meter box for the smart meter uses the process of fuse blowing as a driving force to release the restriction of a set of springs, and uses the elastic force of the springs to trigger the operation of the installation assembly. Then, during the rotation of the turntable, the guidance of a set of arc grooves and arc plates can keep the first fuse holder and the second fuse holder open, and the guidance of another set of arc grooves and arc plates can keep the motor powered on so that the turntable continues to rotate. When the new fuse is in place, the guidance of the above two sets of arc grooves and arc plates is cut off, so that the first fuse holder and the second fuse holder are reset, and the motor is automatically powered off.

[0019] 3. The moisture-proof meter box for the smart meter can be installed with a ventilation structure to make the space inside the box moisture-proof with the help of the heat generated by the electrical components, which can prevent the rust of the metal parts in the box and the occurrence of leakage current. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the internal structure of the electric meter box body in the present invention.

[0022] Figure 3 It is a first cross-sectional structural schematic diagram of the shell in the present invention.

[0023] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0024] Figure 5 It is a second cross-sectional structural schematic diagram of the shell in the present invention.

[0025] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0026] Figure 7 for Figure 5 A partial enlarged view of point C in the middle.

[0027] Figure 8 It is a schematic diagram of the structure inside the shell of the present invention.

[0028] Fig. 9 It is a schematic diagram of the explosion structure of the replacement mechanism in the present invention.

[0029] Fig.10 It is a schematic diagram of the explosion structure of the line protection mechanism in the present invention.

[0030] Fig.11 It is a schematic diagram of the front structure of the load-bearing component in the present invention.

[0031] Fig.12 It is a schematic diagram of the back structure of the load-bearing component in the present invention.

[0032] In the figure: 100, the main body of the meter box; 110, the shell; 120, the vent; 130, the exhaust fan; 200, the line protection mechanism; 210, the first slide slot; 220, the first fuse holder; 230, the second fuse holder; 240, the fuse; 250, the first negative wire; 260, the first positive wire; 270, the installation component; 271, the fixing seat; 272, the second slide slot; 273, the slider; 274, the first spring; 275, the connecting shaft; 276, the first connecting seat; 277, the first connecting rod; 280, the slot; 290, the plug-in block; 300, the replacement mechanism; 310, the motor; 320, the turntable; 330, the bearing component; 331, mounting seat; 332, third slide slot; 333, mounting plate; 334, second spring; 340, power supply assembly; 341, second negative wire; 342, insulating plate; 343, third spring; 344, first power terminal; 345, second positive wire; 346, second power terminal; 350, trigger assembly; 351, fourth slide slot; 352, first trapezoidal block; 353, fifth slide slot; 354, second trapezoidal block; 355, second connecting seat; 356, rotating rod; 357, second connecting rod; 360, supporting assembly; 361, first arc-shaped groove; 362, first arc-shaped plate; 363, second arc-shaped groove; 364, second arc-shaped plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] For example, see Figure 1-Figure 9The moisture-proof meter box for a smart meter includes a meter box body 100, wherein a housing 110 is disposed inside the meter box body 100, a line protection mechanism 200 is disposed inside the housing 110, and the line protection mechanism 200 includes a first fuse holder 220, a second fuse holder 230 and a fuse 240; A plurality of fuses 240 are provided, one of which is installed between the first fuse holder 220 and the second fuse holder 230 as a main fuse, and the remaining fuses 240 are used as backup fuses; A replacement mechanism 300 is also provided in the housing 110. The replacement mechanism 300 includes a turntable 320. A plurality of bearing assemblies 330 are mounted on the turntable 320 in the form of an equidistant circular array. A plurality of fuses 240 are mounted on the plurality of bearing assemblies 330 respectively. The replacement mechanism 300 further includes a trigger assembly 350 . When the main fuse 240 is blown, the trigger assembly 350 drives the turntable 320 to rotate to replace the main fuse 240 with a spare fuse 240 .

[0035] The line protection mechanism 200 includes two first slide grooves 210 symmetrically opened in the housing 110, and the first fuse holder 220 and the second fuse holder 230 are slidably connected in the two first slide grooves 210 respectively; The first fuse holder 220 is provided with a first negative wire 250 and a slot 280, and the second fuse holder 230 is provided with a first positive wire 260 and an insert block 290, and the slot 280 is adapted to the insert block 290; The replacement mechanism 300 further includes a motor 310 and a power supply assembly 340 . The motor 310 is disposed in the housing 110 , and the output shaft of the motor 310 is connected to the rotating disk 320 . The trigger assembly 350 is used to operate the trigger power supply assembly 340 to supply power to the motor 310 , thereby driving the turntable 320 to rotate through the motor 310 .

[0036] In this embodiment: the housing 110 is made of insulating material, and the line protection mechanism 200 installed inside the housing 110 is used to protect various electrical components including the electric meter installed in the electric meter box body 100. The first negative wire 250 is connected to the negative end of the external circuit of the electric meter box body 100, and the first positive wire 260 is connected to the positive end of the external circuit of the electric meter box body 100. In the main power supply line of the internal circuit of the electric meter box body 100, the current flows out after passing through the first negative wire 250, the first fuse holder 220, the fuse 240, the second fuse holder 230, the first positive wire 260 and the various electrical components in the electric meter box body 100.

[0037] like Figure 3As shown in the figure, the first fuse holder 220, the fuse 240 and the second fuse holder 230 are arranged from left to right in sequence, and a plurality of fuses 240 are provided, wherein the one located at the uppermost side is used as the main one, and the rest are used as backup ones. When the main fuse 240 is blown due to a line fault such as a short circuit, the internal line of the meter box body 100 is disconnected, and at this time, the blowing of the fuse 240 will intelligently cause the trigger component 350 to operate.

[0038] The trigger assembly 350 triggers the installation assembly 270 to move the first fuse holder 220 with the blown left half fuse 240 to the left, and the second fuse holder 230 with the blown right half fuse 240 to the right. Then the trigger assembly 350 triggers the power supply assembly 340 to operate, connecting the external circuit of the meter box body 100 with the motor 310. At this time, the motor 310 is powered on and drives the turntable 320 to rotate clockwise.

[0039] The turntable 320 rotates clockwise so that the upper side of the bearing assembly 330 with the fused components installed thereon moves clockwise in a circular motion. Figure 4 As shown in , the disconnected left half fuse 240 can be pulled out from the right side of the first fuse holder 220 , and the disconnected right half fuse 240 can be pulled out from the gap left between the second fuse holder 230 and the right end of the fuse 240 .

[0040] Then the first bearing assembly 330 located in the counterclockwise direction moves clockwise with a spare fuse 240 to the upper position, at which time the spare fuse 240 is between the first fuse holder 220 and the second fuse holder 230, the motor 310 is intelligently powered off again, and the turntable 320 stops rotating. Then the first fuse holder 220 and the second fuse holder 230 are reset, the fuse 240 is fixed in the middle, and the internal circuit of the meter box body 100 is reconnected.

[0041] When the first fuse holder 220 and the second fuse holder 230 are connected, the insert block 290 is inserted into the slot 280 to reinforce the fuse 240 and protect the fuse 240 to a certain extent.

[0042] Embodiment 2: This embodiment is an improvement on Embodiment 1. For details, please refer to Figure 3-Figure 10 The line protection mechanism 200 further includes an installation assembly 270, the installation assembly 270 includes a fixing seat 271 disposed in the housing 110, a second slide groove 272 is provided on the fixing seat 271, a slider 273 is slidably disposed in the second slide groove 272, and the slider 273 is elastically connected to the fixing seat 271 through a first spring 274; A connecting shaft 275 is provided on the slider 273, and a first connecting seat 276 is provided on the first fuse seat 220 and the second fuse seat 230. The mounting assembly 270 also includes two first connecting rods 277, one end of the two first connecting rods 277 are rotatably connected to the connecting shaft 275, and the other ends of the two first connecting rods 277 are rotatably connected to the two first connecting seats 276 respectively.

[0043] The bearing assembly 330 includes a mounting seat 331 disposed on the rotating disk 320, and two third sliding grooves 332 are symmetrically provided on the mounting seat 331. The two third sliding grooves 332 are both slidably provided with mounting plates 333. The fuse 240 is mounted on the two mounting plates 333. The two mounting plates 333 are elastically connected to the mounting seat 331 through two second springs 334 respectively. When the main fuse 240 is blown, the first fuse holder 220 and the second fuse holder 230 are pulled away from each other by the elastic force of the two second springs 334 , so that the slider 273 rises.

[0044] In this embodiment: in a group of bearing components 330 and fuses 240 located on the upper side, when the fuses 240 are not blown, the fuses 240 are mounted on two mounting plates 333 , and the two second springs 334 are maintained in a stretched state by the fuses 240 .

[0045] When the fuse 240 is blown, the two mounting plates 333 lose their supporting force. Under the rebound effect of the two second springs 334, the left mounting plate 333 drives the left half of the fuse 240 and the first fuse holder 220 to move leftward, and the right mounting plate 333 drives the right half of the fuse 240 and the second fuse holder 230 to move rightward. When the two fuses 240 are separated from the first fuse holder 220 and the second fuse holder 230 as the rotating disk 320 rotates, the first fuse holder 220 and the second fuse holder 230 remain in an open state to wait for the next fuse 240 to arrive.

[0046] Furthermore, the leftward movement of the first fuse holder 220 and the rightward movement of the second fuse holder 230 will cause the connecting shaft 275 and the sliding block 273 to move upward through the transmission effect of the two first connecting seats 276 and the two first connecting rods 277 .

[0047] Embodiment 3: This embodiment is an improvement made on the basis of Embodiment 2. For details, please refer to Figure 3-Figure 10The power supply component 340 includes a second negative electrode wire 341 arranged on the motor 310, an insulating plate 342 is slidably arranged in the shell 110, the insulating plate 342 is elastically connected to the shell 110 through a third spring 343, a first power connection post 344 is arranged on the insulating plate 342, a second positive electrode wire 345 is arranged on the first power connection post 344, and a second power connection post 346 is arranged on the motor 310.

[0048] The trigger assembly 350 includes a fourth slide groove 351 opened on the mounting seat 331, a first trapezoidal block 352 is arranged on the slider 273, the first trapezoidal block 352 is slidably connected in the fourth slide groove 351, a fifth slide groove 353 is also opened on the mounting seat 331, a second trapezoidal block 354 is slidably arranged in the fifth slide groove 353, and the first trapezoidal block 352 is matched with the second trapezoidal block 354.

[0049] The insulating plate 342 and the second trapezoidal block 354 are both provided with a second connection seat 355. A rotating rod 356 is rotatably provided in the housing 110. A second connection rod 357 is provided on the rotating rod 356. Both ends of the second connection rod 357 are rotatably connected to the two second connection seats 355 respectively. When the main fuse 240 is blown, the slider 273 and the first trapezoidal block 352 rise to drive the second trapezoidal block 354 to move backward, so that the first power connection post 344 and the second power connection post 346 are connected to each other and the motor 310 is energized.

[0050] The replacement mechanism 300 further includes a support assembly 360, which includes a first arc groove 361 and a second arc groove 363 provided on the mounting seat 331, the first arc groove 361 is connected to the fourth slide groove 351, the second arc groove 363 is connected to the fifth slide groove 353, and the mounting seat 331 is provided with a first arc plate 362 and a second arc plate 364; When the rotating disk 320 rotates, the first arc plate 362 and the second arc plate 364 are used to hold the first trapezoidal block 352 and the second trapezoidal block 354 respectively, so as to keep the motor 310 powered.

[0051] In this embodiment: Figure 6As shown, when the fuse 240 located on the upper side maintains a normal working state and is not blown, the first trapezoidal block 352 installed on the slider 273 is located at the lower side of the fourth slide slot 351, and the second trapezoidal block 354 is located at the front side of the fifth slide slot 353. At this time, the position of the second trapezoidal block 354 is fixed, and the first power post 344 is located behind the second power post 346 through the transmission of the second connecting rod 357. The first power post 344 does not contact the second power post 346, and the motor 310 is not powered at this time. As shown in the figure, the second connecting rod 357 is a telescopic rod, which consists of three sections. The middle section is installed on the rotating rod 356, and the two sections at both ends are rotatably installed on the two second connecting seats 355 respectively. The two sections at both ends are slidably installed on the middle section.

[0052] When the main fuse 240 is blown and the slider 273 drives the first trapezoidal block 352 to rise, the first trapezoidal block 352 slides upward along the fourth slide groove 351. Since the inclined surfaces of the first trapezoidal block 352 and the second trapezoidal block 354 fit, the second trapezoidal block 354 will be pushed backward by the first trapezoidal block 352. The second trapezoidal block 354 slides backward along the fifth slide groove 353, and the transmission of the second connecting seat 355, the second connecting rod 357, and the rotating rod 356 will cause the insulating plate 342 to move forward with the first connecting post 344. The first connecting post 344 is connected to the second connecting post 346. At this time, the current flows out from the negative pole of the external circuit through the second negative pole wire 341, the negative pole interface of the motor 310, the positive pole interface of the motor 310, the second connecting post 346, the first connecting post 344, and the second positive pole wire 345, so that the motor 310 is powered on and running.

[0053] After the motor 310 starts to drive the turntable 320 to rotate clockwise, the mounting seat 331 on the upper side rotates clockwise, so that the first trapezoidal block 352 slides from the upper side of the fourth slide groove 351 to the first arc groove 361, and the lower end of the first trapezoidal block 352 is supported by the first arc plate 362, so that the position of the first trapezoidal block 352 remains unchanged. Then the slider 273 is located at the upper side of the second slide groove 272, and the first fuse holder 220 and the second fuse holder 230 remain in the open state.

[0054] The second trapezoidal block 354 also slides from the fifth slide groove 353 to the second arc groove 363 as the mounting base 331 rotates clockwise, and the lower end of the second trapezoidal block 354 is supported by the second arc plate 364, so that the position of the second trapezoidal block 354 is incorrect. Then the insulating plate 342 and the first power terminal 344 remain at the front position, and the motor 310 remains powered.

[0055] Until the turntable 320 rotates to make the next supporting assembly 330 and the fuse 240 rotate to the upper position, the lower end of the first trapezoidal block 352 loses the support of the previous first arc plate 362, and the first trapezoidal block 352 is now located in the next fourth slide groove 351, then the slider 273 and the first trapezoidal block 352 will move downward under the rebound force of the first spring 274, so that the first fuse holder 220 and the second fuse holder 230 move closer to each other and dock with the new fuse 240.

[0056] At the same time, the lower end of the second trapezoidal block 354 loses the support of the second arc-shaped plate 364, and the second trapezoidal block 354 is now located in the next fifth slide slot 353, and the second trapezoidal block 354 moves forward and resets under the rebound force of the third spring 343, and the insulating plate 342 and the first power connection post 344 move backward and reset, so that the motor 310 is powered off, and the turntable 320 no longer rotates. The replacement of the fuse 240 is completed.

[0057] Embodiment 4: This embodiment is an improvement made on the basis of Embodiment 1. For details, please refer to Figure 1-Figure 2 A ventilation hole 120 is provided on the meter box body 100 , and an exhaust fan 130 is installed in the meter box body 100 .

[0058] In this embodiment: a vent 120 is opened on the meter box body 100, and an exhaust fan 130 is installed to keep the inside of the meter box body 100 ventilated. The heat generated by the electrical components can be used to make the space inside the box moisture-proof, which can prevent the metal parts in the box from rusting and prevent leakage current from occurring.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A moisture-proof meter box for a smart meter, comprising a meter box body (100), characterized in that: A housing (110) is disposed in the meter box body (100), a line protection mechanism (200) is disposed in the housing (110), and the line protection mechanism (200) comprises a first fuse holder (220), a second fuse holder (230) and a fuse (240); A plurality of fuses (240) are provided, one of the fuses (240) is installed between the first fuse holder (220) and the second fuse holder (230) as a main fuse, and the remaining fuses (240) are used as backup fuses; A replacement mechanism (300) is also provided in the housing (110), the replacement mechanism (300) comprising a rotating disk (320), a plurality of bearing assemblies (330) being mounted on the rotating disk (320) in the form of an equidistant circular array, and a plurality of the fuses (240) being mounted on the plurality of the bearing assemblies (330) respectively; The replacement mechanism (300) further comprises a trigger assembly (350), and when the main fuse (240) is blown, the trigger assembly (350) drives the rotating disk (320) to rotate so as to replace the main fuse (240) with a spare fuse (240).

2. The moisture-proof meter box for a smart meter according to claim 1, characterized in that: The line protection mechanism (200) comprises two first sliding grooves (210) symmetrically arranged in the housing (110), and the first fuse holder (220) and the second fuse holder (230) are respectively slidably connected in the two first sliding grooves (210); The first fuse holder (220) is provided with a first negative wire (250) and a slot (280), the second fuse holder (230) is provided with a first positive wire (260) and an insert block (290), and the slot (280) is adapted to fit the insert block (290); The replacement mechanism (300) further comprises a motor (310) and a power supply assembly (340), wherein the motor (310) is arranged in the housing (110), and an output shaft of the motor (310) is connected to the rotating disk (320); The trigger component (350) is operated to trigger the power supply component (340) to supply power to the motor (310), thereby driving the rotating disk (320) to rotate through the motor (310).

3. The moisture-proof meter box for a smart meter according to claim 2, characterized in that: The line protection mechanism (200) further comprises an installation component (270), wherein the installation component (270) comprises a fixing seat (271) arranged in the housing (110), wherein a second sliding groove (272) is provided on the fixing seat (271), wherein a sliding block (273) is slidably arranged in the second sliding groove (272), and wherein the sliding block (273) is elastically connected to the fixing seat (271) via a first spring (274).

4. The moisture-proof meter box for a smart meter according to claim 3, characterized in that: The slider (273) is provided with a connecting shaft (275), and the first fuse holder (220) and the second fuse holder (230) are both provided with a first connecting seat (276). The mounting assembly (270) further comprises two first connecting rods (277), one end of each of the two first connecting rods (277) is rotatably connected to the connecting shaft (275), and the other ends of the two first connecting rods (277) are respectively rotatably connected to the two first connecting seats (276).

5. The moisture-proof meter box for a smart meter according to claim 3, characterized in that: The bearing assembly (330) comprises a mounting seat (331) arranged on the rotating disk (320), two third sliding grooves (332) are symmetrically provided on the mounting seat (331), mounting plates (333) are slidably arranged in the two third sliding grooves (332), the fuse (240) is mounted on the two mounting plates (333), and the two mounting plates (333) are elastically connected to the mounting seat (331) via two second springs (334) respectively; When the main fuse (240) is blown, the elastic force of the two second springs (334) pulls the first fuse holder (220) and the second fuse holder (230) to move in directions away from each other, thereby causing the slider (273) to rise.

6. The moisture-proof meter box for a smart meter according to claim 5, characterized in that: The power supply assembly (340) comprises a second negative lead (341) arranged on the motor (310); an insulating plate (342) is slidably arranged in the housing (110); the insulating plate (342) is elastically connected to the housing (110) via a third spring (343); a first power connection post (344) is arranged on the insulating plate (342); a second positive lead (345) is arranged on the first power connection post (344); and a second power connection post (346) is arranged on the motor (310).

7. The moisture-proof meter box for a smart meter according to claim 6, characterized in that: The trigger assembly (350) includes a fourth slide groove (351) provided on the mounting seat (331), a first trapezoidal block (352) is provided on the slider (273), the first trapezoidal block (352) is slidably connected in the fourth slide groove (351), a fifth slide groove (353) is further provided on the mounting seat (331), a second trapezoidal block (354) is slidably provided in the fifth slide groove (353), and the first trapezoidal block (352) is fitted with the second trapezoidal block (354).

8. The moisture-proof meter box for a smart meter according to claim 7, characterized in that: The insulating plate (342) and the second trapezoidal block (354) are both provided with a second connection seat (355); a rotating rod (356) is rotatably provided in the housing (110); a second connection rod (357) is provided on the rotating rod (356); and two ends of the second connection rod (357) are respectively rotatably connected to the two second connection seats (355); When the main fuse (240) is blown, the slider (273) and the first trapezoidal block (352) rise to drive the second trapezoidal block (354) to move backward, thereby causing the first power connection post (344) and the second power connection post (346) to connect and energize the motor (310).

9. The moisture-proof meter box for a smart meter according to claim 7, characterized in that: The replacement mechanism (300) further comprises a support assembly (360), wherein the support assembly (360) comprises a first arc-shaped groove (361) and a second arc-shaped groove (363) which are provided on the mounting seat (331), wherein the first arc-shaped groove (361) is connected to the fourth slide groove (351), and the second arc-shaped groove (363) is connected to the fifth slide groove (353), and the mounting seat (331) is provided with a first arc-shaped plate (362) and a second arc-shaped plate (364); When the rotating disk (320) rotates, the first arc-shaped plate (362) and the second arc-shaped plate (364) are used to hold the first trapezoidal block (352) and the second trapezoidal block (354) respectively, thereby maintaining the power supply to the motor (310).

10. The moisture-proof meter box for a smart meter according to claim 1, characterized in that: A vent (120) is provided on the meter box body (100), and an exhaust fan (130) is installed in the meter box body (100).

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