An electrical energy metering terminal block

Abstract

The application provides an electric energy metering junction box, comprising a box body, a rotating mechanism, a sliding block, a movable contact piece and a static contact piece are arranged in the inner cavity of the box body; the rotating mechanism comprises a rotating shaft and a plurality of cams mounted on the rotating shaft, and the box body is rotationally connected with the rotating shaft; a sliding block groove corresponding to the position of the cam is arranged on the box body, and the sliding block slides up and down in the sliding block groove under the action of the cam; a reset spring is arranged between the movable contact piece and the box body, and the sliding block drives the movable contact piece to slide up and down in the sliding block groove under the action of the reset spring, so that the connection and disconnection of the movable contact and the static contact are realized. Through the cooperation of the rotating shaft, the cam, the sliding block, the movable contact piece and the static contact piece, the contact and disconnection of the movable contact and the static contact can be realized, the circuit is disconnected or closed by controlling the disconnection or connection of the movable and static contacts, the safety hidden danger existing in the safety production process is solved, and the work efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of power junction box technology, and specifically relates to an electricity metering junction box. Background Technology

[0002] In home renovation, junction boxes are one of the electrical accessories. Because the wires used in renovation run through conduits, junction boxes are used as transitions at the joints of the wires (such as when the wire is long or the conduit needs to turn a corner). The conduit connects to the junction box, and the wires inside the conduit are connected in the junction box, which serves to protect and connect the wires.

[0003] In low-voltage distribution networks, transmission lines generally use a three-phase four-wire system. Three lines represent phases A, B, and C, respectively, while the fourth line is the neutral line N (if the neutral point on the power supply side of the circuit is grounded, the neutral line is also called the zero line; if it is not grounded, strictly speaking, the neutral line cannot be called the zero line). In a three-phase system, when the three phases are balanced, the neutral line (zero line) carries no current, hence the name three-phase four-wire system.

[0004] In current three-phase four-wire junction boxes, to prevent the current transformer from opening during each meter installation, removal, and inspection, the current circuit of each phase needs to be short-circuited and the voltage circuit of each phase needs to be disconnected. Existing junction boxes often change the position of the voltage and current connection pieces to alter the on / off state of the voltage and current circuits, with each connection piece fixed by screws. Due to the large number of screws inside the junction box, the operation is cumbersome and requires a high level of technical skill from the personnel installing and removing the meter. A problem in any step can cause damage to both the personnel and the equipment. Summary of the Invention

[0005] This application provides an energy metering junction box that is applicable to three-phase four-wire junction boxes. It can conveniently control the connection and disconnection of the circuit during each meter installation, removal, and inspection process. The operation process is simple, the technical requirements for the meter installation and removal personnel are not high, and the safety is good.

[0006] This embodiment provides an electricity metering junction box, including a box body, and a rotating mechanism, a slider, a moving contact piece, and a stationary contact piece are provided in the inner cavity of the box body;

[0007] The rotating mechanism includes a rotating shaft and several cams mounted on the rotating shaft. A limiting base is provided at one end of the housing, and one end of the rotating shaft passes through the limiting base. The other end of the rotating shaft is rotatably connected to the other side wall of the housing. A slider groove corresponding to the position of the cam is provided on the housing. The slider slides up and down within the slider groove under the action of the cam. A stationary contact piece is fixedly disposed on both sides of the slider, and the stationary contact is disposed on the stationary contact piece. A moving contact piece is disposed on the slider, and a return spring is provided between the moving contact piece and the housing. The return spring is used to push the slider upwards to return to its original position. Moving contacts corresponding to the stationary contacts are provided at both ends of the moving contact piece. The slider drives the moving contact piece to slide up and down within the slider groove, thereby realizing the connection and disconnection of the moving contact and the stationary contact.

[0008] In one feasible implementation, conductive strips are provided on the boxes on both sides of the slider. One end of the conductive strip near the slider is connected to one end of the stationary contact piece, and the other end of the stationary contact piece is provided with a stationary contact on the side near the box.

[0009] In one feasible implementation, a limit barb is provided at the opening of the slider groove, and the limit barb is used to limit the slider when it is reset.

[0010] In one feasible implementation, a limit post is provided on the side of the moving contact piece near the housing, and the reset spring is sleeved on the limit post.

[0011] In one feasible implementation, the notches of the cams are staggered.

[0012] In one feasible implementation, a pre-tightening force limiting component is provided inside the limiting base;

[0013] The preload limiting assembly includes a limiting ratchet, a limiting block, and a preload spring. The limiting ratchet is fixedly sleeved on the rotating shaft. The arc-shaped inner wall of the limiting base is provided with a first limiting groove with an opening facing the limiting ratchet. The preload spring and the limiting block are disposed in the first limiting groove. One end of the preload spring is fixed to the arc-shaped inner wall of the limiting base, and the other end of the preload spring is connected to one end of the limiting block. The other end of the limiting block is provided with a second limiting groove facing the limiting ratchet. A roller that engages with the limiting ratchet is disposed in the second limiting groove.

[0014] In one feasible implementation, a total stroke limiting component is further provided within the limiting base. The total stroke limiting component is located on the side of the preload limiting component near the cam. The total stroke limiting component includes a limiting plate, which is fixedly sleeved on the rotating shaft. A protrusion is provided on the limiting plate. A closed limiting stop and a disconnecting limiting stop are provided on the limiting base at the limiting plate, which cooperate with the protrusion. When the protrusion rotates to contact the closed limiting stop, the slider corresponding to the current circuit and voltage circuit resets, and the current circuit and voltage circuit are connected. The slider corresponding to the current short circuit is pressed down, and the current short circuit circuit is disconnected. When the protrusion rotates to contact the disconnecting limiting stop, the slider corresponding to the current circuit and voltage circuit is pressed down, and the current circuit and voltage circuit are disconnected. The slider corresponding to the current short circuit circuit resets, and the current short circuit circuit is connected.

[0015] In one feasible implementation, the limiting base is provided with a lead seal mounting hole and a lug, the lug being connected to the box body by screws, and a limiting base cover being connected to the limiting base by screws. The limiting base cover is provided with a "closed" mark corresponding to the position of the closed limiting block and an "open" mark corresponding to the position of the disconnected limiting block.

[0016] In one feasible implementation, a jumper connector is connected between the conductive strips on both sides of the rotating shaft. The jumper connector is connected to the conductive strip by screws and is used to change the circuit.

[0017] In one feasible implementation, the conductive strip is installed in a conductive strip groove provided on the box body, the conductive strip is provided with threaded holes and through holes for conductive wires, and the side wall of the box body is provided with voltage input / output wiring holes and current input / output wiring holes corresponding to the positions of the through holes.

[0018] This application provides an energy metering junction box, which includes a rotating shaft, a cam, a slider, a moving contact piece, and a stationary contact piece. Rotating the rotating shaft causes the cam mounted on it to rotate, and the cam compresses or resets the slider by rotating. The slider causes the moving contact piece to move up and down, thereby realizing the contact and disconnection of the moving and stationary contacts. By controlling the opening or closing of the moving and stationary contacts, the circuit can be opened or closed, solving the safety hazards existing in the safe production process. Its "one-button" operation can greatly improve work efficiency and safety level in production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an electricity metering junction box provided in one embodiment of this application;

[0020] Figure 2This is a schematic diagram of the internal structure of an electricity metering junction box according to an embodiment of this application;

[0021] Figure 3 This is a bottom view of the internal structure of an electricity metering junction box according to an embodiment of this application;

[0022] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0023] Figure 5 This is a schematic diagram of the structure of the preload limiting component in an energy metering junction box according to an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the structure of the total travel limit component in an energy metering junction box according to an embodiment of this application;

[0025] Figure 7 This is a cross-sectional view of the slider in an electrical energy metering junction box according to an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100-Box body; 200-Rotating mechanism; 300-Slider; 400-Moving contact piece; 500-Static contact piece; 600-Limit base; 700-Preload limit assembly; 800-Total stroke limit assembly; 900-Slider groove; 1000-Static contact; 1100-Moving contact; 1200-Return spring; 1300-Conductive strip; 1400-Limit barb; 1500-Limit post; 1600-Jump wire connecting piece; 1700-Knob;

[0028] 210 - Rotating shaft; 220 - Cam;

[0029] 710 - Limiting ratchet; 720 - Limiting block; 730 - Preload spring; 740 - First limiting groove; 750 - Second limiting groove; 760 - Roller;

[0030] 810 - Limiting piece; 820 - Protrusion; 830 - Closed limiting stop; 840 - Opening limiting stop. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0032] In related technologies, current three-phase four-wire junction boxes require short-circuiting the current circuit of each phase and disconnecting the voltage circuit of each phase during each installation, removal, and inspection process to prevent the current transformer from opening. Existing junction boxes often change the on / off state of the voltage and current circuits by changing the position of the voltage and current connection pieces on the junction box.

[0033] However, the connecting pieces are fixed together with screws. Due to the large number of screws in the junction box, the operation process is cumbersome and requires high technical skills from the personnel who install and disassemble the meter. If any link in the process goes wrong, it will cause double damage to the personnel and the equipment.

[0034] Therefore, there is a need to provide an electricity metering junction box that can efficiently and quickly connect and disconnect the circuit.

[0035] Figure 1 This is a schematic diagram of the overall structure of an electricity metering junction box according to an embodiment of this application. See also... Figure 1 As shown, an electricity metering junction box includes a box body 100. A rotating mechanism 200 is provided in the inner cavity of the box body 100. The rotating mechanism 200 includes a rotating shaft 210 and a plurality of cams 220 mounted on the rotating shaft 210. A limiting base 600 is provided at one end of the box body 100. One end of the rotating shaft 210 passes through the limiting base 600, and the other end of the rotating shaft 210 is rotatably connected to the side wall of the other end of the box body 100. Figure 7 This is a cross-sectional view of the slider in an electricity metering junction box according to an embodiment of this application. See also... Figure 7 As shown, the box body 100 is provided with a slider groove 900 corresponding to the position of the cam 220, and the slider 300 slides up and down in the slider groove 900 under the action of the cam 220. Figure 3 This is a top-view structural diagram of the internal structure of an electricity metering junction box provided in one embodiment of this application. Figure 4 yes Figure 3 A magnified view of a portion at point A. See also... Figure 3 and Figure 4 As shown, stationary contact pieces 500 are fixedly disposed on both sides of slider 300, and stationary contact 1000 is disposed on stationary contact pieces 500; movable contact pieces 400 are disposed on slider 300, and a return spring 1200 is disposed between movable contact pieces 400 and housing 100. The return spring 1200 is used to push slider 300 to slide upward and reset. Movable contact pieces 1100 corresponding to stationary contact 100 are disposed at both ends of movable contact pieces 400. Slider 300 drives movable contact pieces 400 to slide up and down in slider groove 900, thereby realizing the connection and disconnection of movable contact 1100 and stationary contact 1000.

[0036] In this embodiment, a rotating shaft 210, a cam 220, a slider 300, a moving contact piece 400, and a stationary contact piece 500 are provided. Rotating the rotating shaft 210 causes the cam 220 mounted on the rotating shaft 210 to rotate. The cam 220 compresses or resets the slider 300 by rotating. The slider 300 causes the moving contact piece 400 to move up and down, thereby realizing the contact and disconnection of the moving contact 1100 and the stationary contact 1000. By controlling the opening or closing of the moving and stationary contacts, the circuit is opened or closed, which solves the safety hazards existing in the safe production process. Its "one-button" operation can greatly improve work efficiency and safety level in production.

[0037] The rotating shaft 210 has a knob 1700 connected to one end of the limiting base 600, which drives the rotating shaft 210 to rotate.

[0038] In some examples, conductive strips 1300 are provided on the housings 100 on both sides of the slider 300. One end of the conductive strip 1300 near the slider 300 is connected to one end of the stationary contact piece 500. The other end of the stationary contact piece 500 near the housing 100 is provided with a stationary contact 1000. The stationary contact 1000 cooperates with the moving contact 1100 to realize the switching on and off of the control circuit.

[0039] Figure 7 This is a cross-sectional view of the slider in an electricity metering junction box according to an embodiment of this application. See also... Figure 7 As shown, in some examples, a limit barb 1400 is provided at the opening of the slider groove 900.

[0040] In this embodiment of the application, a limiting hook 1400 is provided on the slider groove 900. When the slider 300 slides upward under the action of the return spring 1200, the limiting hook 1400 can limit the slider 300 so that it will not easily slide out of the slider groove 900.

[0041] See Figure 4 In some examples, the moving contact piece 400 is provided with a limit post 1500 on the side near the housing 100, and the reset spring 1200 is sleeved on the limit post 1500.

[0042] In this embodiment, the reset spring 1200 is sleeved on the limiting post 1500, so that it is stretched or compressed on the limiting post 1500, thereby limiting the position of the reset spring 1200 and improving the centering and stability of the reset spring 1200.

[0043] In some examples, the notches of cam 220 are offset.

[0044] In this embodiment, the notches of the cams 220 are staggered. The notches of the cams 220 corresponding to the current circuit and the voltage circuit are the same, while the notches of the cams 220 corresponding to the current short-circuit circuit are different from those of the current circuit and the voltage circuit. That is, when the current circuit and the voltage circuit are connected, the current short-circuit circuit is disconnected; when the current circuit and the voltage circuit are disconnected, the current short-circuit circuit is disconnected. During the assembly, disassembly, and inspection process, it is possible to achieve short circuit of the current circuit of each phase and open circuit of the voltage circuit of each phase, and the operation is simple.

[0045] Figure 2 This is a schematic diagram of the internal structure of an electricity metering junction box according to an embodiment of this application; Figure 5 This is a schematic diagram of the preload limiting component 700 in an electricity metering junction box according to an embodiment of this application. See also... Figure 2 and Figure 5 As shown, in some examples, a preload limiting assembly 700 is provided inside the limiting base 600; the preload limiting assembly 700 includes a limiting ratchet 710, a limiting block 720 and a preload spring 730. The limiting ratchet 710 is fixedly sleeved on the rotating shaft 210. A first limiting groove 740 with an opening facing the limiting ratchet 710 is provided on the arc-shaped inner wall of the limiting base 600. The preload spring 730 and the limiting block 720 are disposed in the first limiting groove 740. One end of the preload spring 730 is fixed on the arc-shaped inner wall of the limiting base 600, and the other end of the preload spring 730 is connected to one end of the limiting block 720. The other end of the limiting block 720 is provided with a second limiting groove 750 facing the limiting ratchet 710. A roller 760 that engages with the limiting ratchet 710 is provided in the second limiting groove 750.

[0046] The cross-section of the rotating shaft 210 is square.

[0047] In this embodiment, the groove of the limiting ratchet 710 is set at 45°. During the rotation of the rotating shaft 210 within the total stroke, the roller 760 is engaged in different grooves of the limiting ratchet 710 to complete the limiting. This limiting is a pre-tightening force limiting. Within the total limiting stroke, the rotational force can still be increased to rotate into the next limiting position, ensuring that the rotating shaft 210 is not allowed to rotate arbitrarily.

[0048] Figure 6 This is a schematic diagram of the structure of the total travel limit component 800 in an electricity metering junction box according to an embodiment of this application. See also... Figure 2 and Figure 6As shown, in some examples, a total stroke limiting assembly 800 is also provided within the limiting base 600. The total stroke limiting assembly 800 is located on the side of the preload limiting assembly 700 near the cam 220. The total stroke limiting assembly 800 includes a limiting piece 810, which is fixedly sleeved on the rotating shaft 210. A protrusion is provided on the limiting piece 810. The limiting base 600 at the limiting piece 810 is provided with a closing limiting stop 830 that cooperates with the protrusion and an opening limiting stop 830. When the stop block 840 and the protrusion rotate to contact the closed limit stop block 830, the slider 300 corresponding to the current circuit and voltage circuit resets, the current circuit and voltage circuit are connected, and the slider 300 corresponding to the current short circuit is pressed down, the current short circuit circuit is disconnected; when the protrusion rotates to contact the open limit stop block 840, the slider 300 corresponding to the current circuit and voltage circuit is pressed down, the current circuit and voltage circuit are disconnected, and the slider 300 corresponding to the current short circuit circuit resets, the current short circuit circuit is connected.

[0049] In this embodiment of the application, the cooperation between the limiting piece 810 and the closed limiting block 830 and the open limiting block 840 can facilitate the connection and disconnection of the control circuit, preventing it from moving beyond its travel range.

[0050] See Figure 2 As shown, in some examples, the limiting base 600 is provided with a lead seal mounting hole and a lug. The lug is screwed to the box body 100. The limiting base 600 is screwed to a limiting base 600 cover. The limiting base 600 cover is provided with a "closed" mark corresponding to the position of the closed limiting block 830 and an "open" mark corresponding to the position of the open limiting block 840.

[0051] In this embodiment, the limiting base 600 is provided with circuit "on" and "off" indicators, and the knob 1700 has an indicator arrow, which can clearly identify the current state of the circuit; when the lead seal is installed in the lead seal mounting hole, it can prevent electricity theft and identify whether electricity has been stolen.

[0052] In some examples, a jumper connector 1600 is connected between the conductive strips 1300 on both sides of the rotating shaft 210, and the jumper connector 1600 is connected to the conductive strip 1300 by screws.

[0053] Among them, the jumper connector 1600 is a conductive phosphor bronze circuit connector, which meets the requirements of the circuit that needs to be disconnected or connected when "closed" or "opened". The jumper connector 1600 is connected to the copper conductive strip 1300 by a phosphor bronze screw.

[0054] This application embodiment includes a jumper connector 1600, which is used to change the circuit.

[0055] In some examples, the conductive strip 1300 is installed in the conductive strip groove provided on the housing 100. The conductive strip 1300 is provided with threaded holes and through holes for conductive wires. The side wall of the housing 100 is provided with voltage input / output wiring holes and current input / output wiring holes corresponding to the positions of the through holes.

[0056] The conductive strip groove in this embodiment facilitates the fixing of the conductive strip 1300, and the through hole facilitates the fixing of the wire.

[0057] In some examples, the cam 220 is fixedly sleeved on the rotating shaft 210 by a bushing, and retaining rings are provided on both sides of the bushing.

[0058] In this embodiment, multiple grooved retaining rings are provided on the rotating shaft 210 to limit the axial movement of the cam 220 device.

[0059] In some examples, the box body 100 is provided with a lid, and the box body 100 and the lid are snapped together around the perimeter, eliminating the original screw connection and allowing for tool-free installation, thus improving efficiency and operability.

[0060] The box body 100 and the lid are both made of transparent PMMA material, which allows the movement of the internal mechanism and the closed state of the circuit to be clearly seen during operation, further improving safety.

[0061] In actual use, rotate the knob 1700 to the "on" mark. The knob 1700 drives the rotating shaft 210 to rotate. The rotating shaft 210 transmits power to the cam 220. The cam 220, which is offset from the notch, compresses or resets the slider 300 by rotating. When the protruding part of the cam 220 rotates above the slider 300, the slider 300 is compressed, causing the moving contact piece 400 to slide downwards in the slider groove 900. At this time, the moving contact 1100 on the moving contact piece 400 is disconnected from the stationary contact 1000 on the stationary contact piece 500, the return spring 1200 is in a compressed state, and the current circuit and voltage circuit are disconnected. When the notched part of the cam 220 rotates above the slider 300, the slider 300 and the moving contact piece 400 slide upwards under the action of the return spring 1200, and the moving contact 1100 on the moving contact piece 400 contacts the stationary contact 1000 on the stationary contact piece 500. The current short circuit circuit is connected, realizing the current short circuit and voltage short circuit.

[0062] Rotating knob 1700 to the "Close" position causes knob 1700 to drive rotating shaft 210 to rotate. Rotating shaft 210 transmits power to cam 220. Cam 220, with its notches offset, compresses or resets slider 300 by rotating. When the protruding part of cam 220 rotates above slider 300, slider 300 is compressed, causing moving contact piece 400 to slide downwards within slider groove 900. At this time, moving contact 1100 on moving contact piece 400 disconnects from stationary contact 1000 on stationary contact piece 500, and reset spring 1200 is in a compressed state, connecting the current circuit and voltage circuit. When the notched part of cam 220 rotates above slider 300, slider 300 and moving contact piece 400 slide upwards under the action of reset spring 1200, and moving contact 1100 on moving contact piece 400 contacts stationary contact 1000 on stationary contact piece 500, disconnecting the current short-circuit circuit.

[0063] This application, without altering the wiring rules and methods of existing three-phase four-wire junction boxes, integrates a "one-button" operation to close the circuit by adding a slider, reset spring, rotation mechanism, limit component, knob, and indicator. This solves the safety hazards existing in the safe production (meter replacement) process. This equipment has a wide range of applications and is widely used in all public and private transformer metering. Its "one-button" operation can greatly improve work efficiency and safety level in production.

[0064] It is readily understood that, based on the several embodiments provided in this application, those skilled in the art can combine, split, or reorganize the embodiments of this application to obtain other embodiments, none of which exceed the protection scope of this application.

[0065] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. An electricity metering junction box, characterized in that, The box includes a housing, and the inner cavity of the housing is provided with a rotating mechanism, a slider, a moving contact piece, a stationary contact piece, a preload limiting component, and a total stroke limiting component; The rotating mechanism includes a rotating shaft and several cams mounted on the rotating shaft. One end of the box is provided with a limiting base. One end of the rotating shaft passes through the limiting base, and the other end of the rotating shaft is rotatably connected to the other side wall of the box. The box body is provided with a slider groove corresponding to the position of the cam, and the slider slides up and down in the slider groove under the action of the cam. The stationary contact piece is fixedly disposed on both sides of the slider, and the stationary contact is disposed on the stationary contact piece; the movable contact piece is disposed on the slider, and a return spring is disposed between the movable contact piece and the housing. The return spring is used to push the slider to slide upward and return to its original position. The movable contact piece is provided with movable contacts at both ends corresponding to the stationary contacts. The slider drives the movable contact piece to slide up and down in the slider groove, thereby realizing the connection and disconnection of the movable contact and the stationary contact. The preload limiting assembly includes a limiting ratchet, a limiting block, and a preload spring. The limiting ratchet is fixedly sleeved on the rotating shaft. The arc-shaped inner wall of the limiting base is provided with a first limiting groove with an opening facing the limiting ratchet. The preload spring and the limiting block are disposed in the first limiting groove. One end of the preload spring is fixed to the arc-shaped inner wall of the limiting base, and the other end of the preload spring is connected to one end of the limiting block. The other end of the limiting block is provided with a second limiting groove facing the limiting ratchet. A roller that engages with the limiting ratchet is disposed in the second limiting groove. The total stroke limiting component is located on the side of the preload limiting component near the cam. The total stroke limiting component includes a limiting plate, which is fixedly sleeved on the rotating shaft. The limiting plate has a protrusion. The limiting base at the limiting plate has a closed limiting stop and a disconnecting limiting stop that cooperate with the protrusion. When the protrusion rotates to contact the closed limiting stop, the slider corresponding to the current circuit and voltage circuit resets, and the current circuit and voltage circuit are connected. The slider corresponding to the current short circuit is pressed down, and the current short circuit circuit is disconnected. When the protrusion rotates to contact the disconnecting limiting stop, the slider corresponding to the current circuit and voltage circuit is pressed down, and the current circuit and voltage circuit are disconnected. The slider corresponding to the current short circuit circuit resets, and the current short circuit circuit is connected.

2. The power metering junction box according to claim 1, characterized in that, Conductive strips are provided on the boxes on both sides of the slider. One end of the conductive strip near the slider is connected to one end of the stationary contact piece, and the other end of the stationary contact piece is provided with a stationary contact on the side near the box.

3. The power metering junction box according to claim 1, characterized in that, A limit barb is provided at the opening of the slider groove, and the limit barb is used to limit the slider when it is reset.

4. The power metering junction box according to claim 1, characterized in that, A limit post is provided on the side of the moving contact piece near the housing, and the reset spring is sleeved on the limit post.

5. The power metering junction box according to claim 1, characterized in that, The notches of the cams are staggered.

6. The power metering junction box according to claim 1, characterized in that, The limiting base is provided with a lead seal mounting hole and a lug. The lug is connected to the box body by screws. A limiting base cover is connected to the limiting base by screws. The limiting base cover is provided with a "closed" mark corresponding to the position of the closed limiting block and an "open" mark corresponding to the position of the open limiting block.

7. The power metering junction box according to claim 2, characterized in that, A jumper connector is connected between the conductive strips on both sides of the rotating shaft. The jumper connector is connected to the conductive strip by screws and is used to change the circuit.

8. The power metering junction box according to claim 7, characterized in that, The conductive strip is installed in the conductive strip groove provided on the box body. The conductive strip is provided with threaded holes and through holes for conductive wires. The side wall of the box body is provided with voltage input and output wiring holes and current input and output wiring holes corresponding to the positions of the through holes.

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