Dual-throw switching junction box

Abstract

The invention discloses a double-throw switching junction box, which relates to a junction box. Currently, the operation is performed by shifting the conductive member stuck on the terminal, which has a small operating space and a long operating time; and there is a risk of electric shock. The knife switch assembly of the invention includes a first knife switch assembly and a second knife switch assembly; the first knife switch assembly and the second knife switch assembly both include a static contact, a connecting seat and a copper blade; the connecting seat is fixedly connected to the copper rod, the tail of the copper blade is rotatably connected to the connecting seat, the middle of the copper blade matches the static contact, and the heads of the copper blades are all embedded in the same operating handle; the operating handle or the copper blade matches a limit cover provided on the static contact and the connecting seat to limit the swing angle of the knife switch assembly. In this technical solution, the safety is good, the conductor is avoided from being exposed, and the work safety is improved. The contact position of the copper blade and the static contact is fixed, which improves the reliability of the electrical connection, and it can prevent the copper blade from being connected to the screw of the terminal.

Description

Technical Field

[0001] The invention relates to a junction box, in particular to a double-throw switching junction box. Background Art

[0002] The energy metering joint junction box is the test terminal referred to in the inspection regulations for energy metering devices. The energy metering joint junction box can reduce the number of TA (current transformer) and TV (voltage transformer), facilitate the live calibration of measuring instruments, and can replace the connected instruments under live conditions without affecting the normal operation of other instruments. The joint junction box plays a pivotal role in the electrical measurement circuit, can effectively prevent wiring errors, improve measurement accuracy, and has multiple functions and has been widely used.

[0003] With the popularization of energy metering joint junction boxes, more and more problems are exposed during the installation and use of junction boxes. The existing energy metering joint junction boxes mainly switch between the working and disconnecting states of the junction boxes by connecting and disconnecting different terminals. Such energy metering joint junction boxes are extremely prone to misunderstandings during connection. Moreover, such junction boxes have too many contacts inside, which not only requires many operating procedures, but also makes the installation process quality difficult to control, and has poor practicality.

[0004] In order to achieve the connection and disconnection of the circuit without operating the wiring terminal, the conductive member stuck on the terminal is displaced, which has a small operation space and a long operation time. There is also a risk of electric shock. Summary of the invention

[0005] The technical problem to be solved and the technical task proposed by the present invention are to improve and perfect the existing technical solutions and provide a double-throw switching junction box to achieve the purpose of safe and convenient operation. To this end, the present invention adopts the following technical solutions.

[0006] A double-throw switching junction box comprises a box body, a plurality of vertically arranged copper rods embedded in the box body, and a knife assembly for controlling the on-off of the copper rods. The ends of the copper rods located on the upper and lower sides of the box body serve as wiring terminals to be connected to the power supply side voltage, the power supply side current, the voltage transformer and the current transformer accordingly. The knife assembly comprises a first knife assembly for controlling the on-off of the voltage transformer and a second knife assembly for controlling the on-off of the current transformer. The first knife assembly and the second knife assembly both comprise a static contact, a connecting seat and a copper blade. The connecting seat is fixedly connected to the copper rod, the tail of the copper blade is rotatably connected to the connecting seat, the middle of the copper blade matches the static contact, and the heads of the copper blades are all embedded in the same operating handle. The operating handle or the copper blade matches a limit cover provided on the static contact and the connecting seat to limit the swing angle of the knife assembly. In the present technical solution, when the operating handle is operated, the voltage transformer and current transformer connected to the three phases A, B, and C can be cut off or opened at the same time, thus realizing the on-off of the voltage circuit and the current circuit; the operation is very simple and safe, and the limit cover is made of insulating material; the limit cover protects the static contact and the connecting socket to avoid exposure of the conductor, thereby improving work safety, and due to the existence of the limit cover, the opening and closing angle of the copper blade is limited, so that the copper blade can be reliably connected to the static contact, and the contact position of the copper blade and the static contact is fixed, thereby improving the reliability of the electrical connection, and can prevent the copper blade from being connected to the screw of the terminal.

[0007] As a preferred technical means: the connecting seat is sleeved on the copper rod, the two ends of the connecting seat are bent outward to form a protruding rotating connection part, and the copper blade is connected to the rotating connection part of the clamp through a rotating shaft. The copper blade and the connecting seat are reliably connected. When assembling the connecting seat, the connecting seat is sleeved into the copper rod, and then the copper rod is embedded in the box body, which is convenient for assembly.

[0008] As a preferred technical means: a hole is provided at the bottom of the relatively rotating connection part of the connection seat, a screw is passed through the hole, and the end of the screw presses against the copper rod to fix the connection seat on the copper rod. The connection is reliable and easy to assemble, and the screw is a copper part.

[0009] As a preferred technical means: the static contact of the first blade assembly is a voltage static contact, the voltage static contact is sheathed on the copper rod, and the two ends of the voltage static contact are bent outward to form a protruding Y-shaped closing clamp. The voltage static contact can be stamped from a copper sheet, and the voltage static contact is inserted into the copper rod and then pressed with a screw, and the screw used for pressing is screwed in from the back, which is convenient and reliable to assemble, the Y-shaped closing clamp is elastic, reliable to clamp, and the trumpet-shaped opening facilitates the copper blade to be inserted into the Y-shaped closing clamp.

[0010] As a preferred technical means: the static contact of the second knife switch assembly is a current loop static contact, the current loop static contact is formed by bending a copper sheet, the two ends of the current loop static contact are bent outward to form a protruding Y-shaped closed clamp, the current loop static contact is connected to the adjacent copper rods connected to the same current transformer through the copper sheet, when the copper blade of the second knife switch assembly is inserted into the Y-shaped closed clamp of the current loop static contact, the two copper rods connected to the same current transformer form a current loop through the copper sheet; the copper rod between the current transformer and the power supply is a whole copper rod. In this technical solution, when the copper rod connected to the current transformer is a whole copper rod, the resistance is reduced, making the measurement more accurate. When cutting, the two adjacent copper rods are short-circuited with copper sheets, so that the two adjacent copper rods directly form a loop, and the current does not pass through the meter connected in series with the two adjacent copper rods.

[0011] As a preferred technical means: there are multiple sets of knife assemblies, including A-phase knife assemblies, B-phase knife assemblies, C-phase knife assemblies and neutral-phase knife assemblies, wherein the A-phase knife assemblies, the B-phase knife assemblies and the C-phase knife assemblies all include the first knife assemblies and the second knife assemblies, and the neutral-phase knife assemblies include the first knife assemblies; wherein the copper rods are divided into the first copper rod, the second copper rod, the third copper rod and the fourth copper rod; wherein the first copper rod and the second copper rod are arranged in the same row, the lower connection end of the first copper rod is the voltage connection end on the power supply side, the upper connection end of the second copper rod is the voltage transformer connection end, and the first knife assembly is arranged on the upper end of the first copper rod and the lower end of the second copper rod; the third copper rod and the fourth copper rod are arranged in parallel; the upper connection ends of the third copper rod and the fourth copper rod are the current transformer connection ends, and the lower connection ends of the third copper rod and the fourth copper rod are the current connection ends on the power supply side;

[0012] When in working state, the operating handle is in the upper position, and the copper blade electrically connected to the second copper rod is inserted into the static contact electrically connected to the first copper rod, so that the second copper rod and the first copper rod are at the same potential; and the copper blade electrically connected to the third copper rod and the static contact electrically connected to the fourth copper rod are in the disconnected state, so that the current passes through the double-throw switching junction box and the meter; thereby realizing the connection of the voltage circuit and the closing of the current circuit.

[0013] In the inspection state, the operating handle is in the lower position, the copper blade electrically connected to the second copper rod is separated from the static contact electrically connected to the first copper rod, so that the second copper rod and the first copper rod are not at the same potential; and the copper blade electrically connected to the third copper rod is inserted into the static contact electrically connected to the fourth copper rod, and the current flows back to the fourth copper rod through the third copper rod and the copper blade, avoiding the current flowing through the double-throw switching junction box through the meter, and no current passes through the meter; thereby achieving the disconnection of the voltage circuit and the short-circuit of the current circuit.

[0014] In the present technical solution, since the third copper rod and the fourth copper rod are whole, it is not necessary to connect the disconnected copper rods with copper blades, so as to realize the passage, reduce the number of copper blades, reduce the resistance of the knife switch, and reduce the force required for switching operations, so as to make the operation flexible, make the operating handle with insulation strength meet the strength requirements, and improve the reliability of work. When there are 7 sets of knife assemblies, they are used to complete the operation of the A-phase knife assembly, the B-phase knife assembly, the C-phase knife assembly and the neutral phase knife 7. There are 4 copper blades on one side and 3 on the other side, with a maximum clamping force of 4. The blades are clamped by the clamping force to close the circuit, ensure the opening and closing of the circuit, and make the knife switch reliably connected. The present technical solution does not require 8 blades on one side, which reduces the difficulty of operation and multiplies the reliability of work.

[0015] As a preferred technical means: the box body includes a rear box cover, a front box cover and a box seat; fences are provided around the front and rear sides of the box seat; convex ribs are provided on the back of the box seat to separate the copper rods; a socket is provided on the box seat, and the connection seat and the static contact of the first knife switch assembly are embedded in the socket; the static contact of the second knife switch assembly is provided on a copper sheet overlapped with the two copper rods, and the copper sheet is provided on the front of the box seat, and the screw passes through the copper sheet, the box seat and the copper rod. The copper rods connected to a current transformer are the third and fourth copper rods, and a connection seat is provided on the third copper rod. After the copper blade provided on the connection seat is inserted into the corresponding static contact, a circuit is formed through the copper sheet electrically connected to the static contact and the fourth copper rod electrically connected to the copper sheet.

[0016] As a preferred technical means: the upper and lower parts of the box seat are the wiring parts, the front of the wiring part is provided with a raised limiting rib and a through hole, the distance between the upper and lower limiting ribs is greater than the width of the limiting cover, and the through hole is inserted with a connecting screw for fastening the wire to the copper rod; the limiting cover is provided with a plurality of vertical copper blade grooves, and the copper blade is connected to the operating handle after passing through the copper blade groove. The copper blade groove can guide the copper blade so that the copper blade can be reliably inserted into the static contact, and the copper blade groove also plays a limiting role, which can limit the up and down swing angle of the copper blade.

[0017] As a preferred technical means: a positioning part is provided on the box seat between the upper and lower limiting ribs, and a limiting cover is inserted between the positioning part and the limiting ribs; the positioning part and the limiting ribs cooperate to limit the displacement of the limiting cover, the limiting ribs are higher than the positioning part, and the fence is higher than the limiting ribs. The positioning part is provided with a plurality of through holes, and screws are screwed into the through holes to tighten the wires inserted into the copper rod; because the positioning part is covered with a limiting cover, the screws are exposed, which can facilitate wiring. Moreover, when the voltage transformer and the current transformer are in the connected state, the operating handle blocks the screws on the positioning part located on the upper part of the box seat, making it impossible for the operator to operate, further improving the reliability of the work.

[0018] As a preferred technical means: the operating handle is a rectangular parallelepiped, which is formed by splicing a first cover and a second cover, the first cover and the second cover are provided with slots matching the copper blades, the copper blade head is provided with multiple notches, and the slot is provided with multiple protrusions that can be embedded in the notches. The structure is simple, multiple copper blades are neatly arranged, so that the multiple copper blades can move in unison, and the notches are provided so that the copper blades can be reliably connected to the operating handle.

[0019] As a preferred technical means: both the left and right sides of the front box cover are provided with anti-opening rings, and the anti-opening rings are provided with anti-opening through holes that penetrate from top to bottom; the anti-opening through holes can be opposite to the radial perforations of the heads of the anti-opening nails; the anti-opening nails are connected to the box seat after passing through the front box cover, so that the anti-opening device, such as a lead-sealed cord, can pass through.

[0020] Beneficial effects: In the present technical solution, when the operating handle is operated, the voltage transformer and current transformer connected to the three phases A, B, and C can be cut off or opened at the same time, realizing the on-off of the voltage circuit and the closing and short-circuiting of the current circuit; the operation is very simple and safe, and the limit cover is made of insulating material; the limit cover protects the static contact and the connecting seat to avoid exposure of the conductor, thereby improving work safety, and due to the existence of the limit cover, the opening and closing angle of the copper blade is limited, so that the copper blade can be reliably connected to the static contact, and the contact position of the copper blade and the static contact is fixed, thereby improving the reliability of the electrical connection, and can prevent the copper blade from being connected to the screw of the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the appearance structure of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the present invention with the front box cover removed.

[0023] Figure 3 It is a schematic diagram of a blasting viewing structure of the present invention.

[0024] Figure 4 It is another schematic diagram of the blasting viewing structure of the present invention.

[0025] Figure 5 It is a schematic diagram of the conductor structure of the present invention.

[0026] Figure 6 It is a circuit schematic diagram of the present invention.

[0027] In the figure: 1. box body; 101. rear box cover; 102. front box cover; 103. box seat; 104. convex rib; 105. limiting rib; 106. anti-opening ring; 2. first knife switch assembly; 3. second knife switch assembly; 4. static contact; 5. connecting seat; 6. copper blade; 7. copper rod; 701. first copper rod; 702. second copper rod; 703. third copper rod; 704. fourth copper rod; 8. limiting cover; 9. operating handle; 901. first assembly cover; 902. second assembly cover; 10. anti-opening nail; 11. copper sheet. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] like Figure 1-6 As shown, the present invention includes a box body 1, a plurality of vertically arranged copper rods 7 embedded in the box body 1, and a knife assembly for controlling the on-off of the copper rods 7. The ends of the copper rods 7 located on the upper and lower sides of the box body 1 serve as wiring terminals to be connected to the power supply side voltage, the power supply side current, the voltage transformer and the current transformer. The knife assembly includes a first knife assembly 2 for controlling the on-off of the voltage transformer and a second knife assembly 3 for controlling the on-off of the current transformer. The first knife assembly 2 and the second knife assembly 3 both include a static contact 4, a connecting seat 5 and a copper blade 6. The connecting seat 5 is fixedly connected to the copper rod 7, the tail of the copper blade 6 is rotatably connected to the connecting seat 5, the middle of the copper blade 6 is matched with the static contact 4, and the head of the copper blade 6 is embedded in the same operating handle 9. The operating handle 9 or the copper blade 6 is matched with a limit cover 8 provided on the static contact 4 and the connecting seat 5 to limit the swing angle of the knife assembly. In the present technical solution, when the operating handle 9 is operated, the voltage transformer and current transformer connected to the three phases A, B, and C can be cut off or opened at the same time, realizing the on-off of the voltage circuit and the closing and short-circuiting of the current circuit; the operation is very simple and safe, and the limit cover 8 is made of insulating material; the limit cover 8 protects the static contact 4 and the connecting seat 5 to avoid exposure of the conductor, thereby improving work safety, and due to the existence of the limit cover 8, the opening and closing angle of the copper blade 6 is limited, so that the copper blade 6 can be reliably connected to the static contact 4, and the contact position of the copper blade 6 and the static contact 4 is fixed, thereby improving the reliability of the electrical connection, and can prevent the copper blade 6 from being connected to the screw of the terminal.

[0030] In this embodiment, there are multiple sets of knife assemblies, which can be A-phase knife assemblies, B-phase knife assemblies, C-phase knife assemblies and neutral-phase knife assemblies, wherein the A-phase knife assemblies, the B-phase knife assemblies and the C-phase knife assemblies all include the first knife assemblies 2 and the second knife assemblies 3, and the neutral-phase knife assemblies include the first knife assemblies 2; wherein the copper rod 7 is divided into the first copper rod 701, the second copper rod 702, the third copper rod 703 and the fourth copper rod 704; wherein the first copper rod 701 and the second copper rod 702 are the same The first copper rod 701 is arranged in a row, the lower connection end of the first copper rod 701 is the voltage connection end on the power supply side, the upper connection end of the second copper rod 702 is the voltage transformer connection end, and the first switch assembly 2 is arranged on the upper end of the first copper rod 701 and the lower end of the second copper rod 702; the third copper rod 703 and the fourth copper rod 704 are arranged in parallel; the upper connection ends of the third copper rod 703 and the fourth copper rod 704 are the current transformer connection ends, and the lower connection ends of the third copper rod 703 and the fourth copper rod 704 are the current connection ends on the power supply side.

[0031] For easy assembly, the connection seat 5 is sleeved on the second copper rod 702 and the third copper rod 703, and the two ends of the connection seat 5 are bent outward to form a protruding rotating connection part, and the copper blade 6 is connected to the rotating connection part of the clamp through a rotating shaft. The copper blade 6 and the connection seat 5 are reliably connected. When assembling the connection seat 5, the connection seat 5 is inserted into the copper rod 7, and then the copper rod 7 is embedded in the box body 1, which is convenient for assembly. A hole is set at the bottom of the relatively rotating connection part of the connection seat 5, and a screw is passed through the hole. The end of the screw is pressed against the copper rod 7, so that the connection seat 5 is fixed to the copper rod 7. The connection is reliable and easy to assemble, and the screw is a copper part.

[0032] In order to improve the reliability of contact, the static contact 4 of the first blade assembly 2 is a voltage static contact, which is sleeved on the first copper rod 701, and the two ends of the voltage static contact are bent outward to form a protruding Y-shaped closing clamp. The voltage static contact can be stamped from a copper sheet, and the voltage static contact is sleeved into the first copper rod 701 and then pressed with a screw, and the screw used for pressing is screwed in from the back, which is convenient and reliable to assemble. The Y-shaped closing clamp is elastic and reliable to clamp, and the trumpet-shaped opening facilitates the copper blade 6 to be inserted into the Y-shaped closing clamp.

[0033] The static contact 4 of the second knife switch assembly 3 is a static contact of the current loop, which is formed by bending a copper sheet, and the two ends of the static contact of the current loop are bent outward to form a protruding Y-shaped closed clamp. The static contact of the current loop is connected to the adjacent fourth copper rod 704 connected to the same current transformer through the copper sheet 11. When the copper blade 6 of the second knife switch assembly 3 is inserted into the Y-shaped closed clamp of the static contact of the current loop, the third copper rod 703 and the fourth copper rod 704 connected to the same current transformer form a current loop through the copper sheet 11; the third copper rod 703 and the fourth copper rod are a whole copper rod 7. The whole copper rod 7 reduces resistance, making the measurement more accurate.

[0034] In order to ensure safety and facilitate assembly, the box body 1 includes a rear box cover 101, a front box cover 102 and a box seat 103. The front and rear sides of the box seat 103 are surrounded by fences. The back of the box seat 103 is provided with convex ribs 104 to separate the copper rods 7. The box seat 103 is provided with a socket, in which the connection seat 5 and the static contact 4 of the first switch blade assembly 2 are embedded. The static contact 4 of the second switch blade assembly 3 is arranged on the copper sheet 11 overlapped with the third copper rod 703 and the fourth copper rod 704. The copper sheet 11 is arranged on the front of the box seat 103. The screw passes through the copper sheet 11, the box seat 103 and is connected with the fourth copper rod 704, so that the static contact 4 is electrically connected with the fourth copper rod 704. The connection seat 5 is arranged on the third copper rod 703. After the copper blade 6 arranged on the connection seat 5 is inserted into the corresponding static contact 4, a circuit is formed through the copper sheet 11 electrically connected to the static contact 4 and the fourth copper rod 704 electrically connected to the copper sheet 11.

[0035] To realize reliable and convenient operation of the junction box; the upper and lower parts of the box seat 103 are the wiring parts, and the front of the wiring part is provided with a raised limiting rib 105 and a through hole, and the distance between the upper and lower limiting ribs 105 is greater than the width of the limiting cover 8, and the through hole is inserted with a connecting screw for fastening the wire to the copper rod 7; the limiting cover 8 is provided with a plurality of vertical copper blade 6 grooves, and the copper blade 6 is connected to the operating handle 9 after passing through the copper blade 6 grooves. The copper blade 6 grooves can guide the copper blade 6 so that the copper blade 6 can be reliably inserted into the static contact 4, and the copper blade grooves also play a limiting role, which can limit the up and down swing angles of the copper blade 6.

[0036] A positioning part is provided on the box seat 103 between the upper and lower limiting ribs 105, and a limiting cover 8 is inserted between the positioning part and the limiting rib 105; the positioning part and the limiting rib 105 cooperate to limit the displacement of the limiting cover 8, the limiting rib 105 is higher than the positioning part, and the fence is higher than the limiting rib 105. The positioning part is provided with a plurality of through holes, and screws are screwed into the through holes to tighten the wires inserted into the copper rod 7; because the positioning part is covered by the limiting cover 8, the screws are exposed, which can facilitate wiring. Moreover, when the voltage transformer and the current transformer are in the connected state, the operating handle 9 blocks the screws on the positioning part located on the upper part of the box seat 103, making it impossible for the operator to operate, further improving the reliability of the work.

[0037] The operating handle 9 is a rectangular parallelepiped, which is formed by splicing a first cover 901 and a second cover 902. The first cover 901 and the second cover 902 are provided with slots matching the copper blade 6. The head of the copper blade 6 is provided with multiple notches, and the slot is provided with multiple protrusions that can be embedded in the notches. The structure is simple, and multiple copper blades 6 are neatly arranged so that the multiple copper blades 6 can move in unison. The notches are provided so that the copper blades 6 are reliably connected to the operating handle 9.

[0038] In order to realize the anti-opening and facilitate assembly, the left and right sides of the front box cover 102 are provided with anti-opening rings 106, and the anti-opening rings 106 are provided with anti-opening through holes that penetrate from top to bottom; the anti-opening through holes can be opposite to the radial perforations of the heads of the anti-opening nails 10; the anti-opening nails 10 are connected to the box seat 103 after passing through the front box cover 102, so as to facilitate the anti-opening device, such as a cord with a lead seal to pass through.

[0039] The ABC three-phase voltage circuit and the N neutral line circuit are opened and closed by the up and down operation of the knife switch; the ABC three-phase current circuit is also short-circuited by the up and down operation of the knife switch. The voltage circuit knife voltage discharge gap is controlled below 4mm, and the current circuit cutoff is controlled at 5A and below.

[0040] When in working state, the operating handle 9 is in the upper position, and the copper blade 6 electrically connected to the second copper rod 702 is inserted into the static contact 4 electrically connected to the first copper rod 701, so that the second copper rod 702 and the first copper rod 701 are at the same potential; and the copper blade 6 electrically connected to the third copper rod 703 and the static contact 4 electrically connected to the fourth copper rod 704 are in the disconnected state, so that the current passes through the double-throw switching junction box and the meter; thereby realizing the connection of the voltage circuit and the closing of the current circuit.

[0041] When in the maintenance state, the operating handle 9 is in the lower position, the copper blade 6 electrically connected to the second copper rod 702 is separated from the static contact 4 electrically connected to the first copper rod 701, so that the second copper rod 702 and the first copper rod 701 are not at the same potential; and the copper blade 6 electrically connected to the third copper rod 703 is inserted into the static contact 4 electrically connected to the fourth copper rod 704, and the current flows back to the fourth copper rod 704 through the third copper rod 703 and the copper sheet 11, avoiding the current from flowing through the meter through the double-throw switching junction box, and no current passes through the meter; thereby achieving the disconnection of the voltage circuit and the short-circuit of the current circuit.

[0042] above Figure 1-6 The double-throw switching junction box shown is a specific embodiment of the present invention, which has embodied the substantial characteristics and progress of the present invention. According to actual use needs and under the guidance of the present invention, equivalent modifications in shape, structure, etc. can be made to it, which are all within the protection scope of this scheme.

Claims

1. A double-throw switching junction box, comprising a box body (1), a plurality of vertically arranged copper rods (7) embedded in the box body (1), and a switch assembly for controlling the on and off of the copper rods (7), the ends of the copper rods (7) located at the upper and lower sides of the box body (1) serving as wiring terminals for correspondingly connecting to a power supply side voltage, a power supply side current, a voltage transformer, and a current transformer, characterized in that: The knife switch assembly comprises a first knife switch assembly (2) for controlling the on and off of a voltage transformer and a second knife switch assembly (3) for controlling the on and off of a current transformer; the first knife switch assembly (2) and the second knife switch assembly (3) both comprise a stationary contact (4), a connecting seat (5) and a copper blade (6); the connecting seat (5) is fixedly connected to a copper rod (7); the tail of the copper blade (6) is rotatably connected to the connecting seat (5); the middle of the copper blade (6) matches the stationary contact (4); the head of the copper blade (6) is embedded in the same operating handle (9); the operating handle (9) or the copper blade (6) matches a limit cover (8) provided on the stationary contact (4) and the connecting seat (5) to limit the swing angle of the knife switch assembly; The connecting seat (5) is sleeved on the copper rod (7), and the two ends of the connecting seat (5) are bent outward to form a protruding rotating connecting portion, and the copper blade (6) is connected to the rotating connecting portion of the hoop through a rotating shaft; A hole is provided at the bottom of the relatively rotating connection portion of the connection seat (5), a screw is passed through the hole, and the end of the screw presses against the copper rod (7), so that the connection seat (5) is fixedly connected to the copper rod (7); The static contact (4) of the first knife switch assembly (2) is a voltage static contact, the voltage static contact is sheathed on the copper rod (7), and both ends of the voltage static contact are bent outwards to form a protruding Y-shaped closing clamp; The static contact (4) of the second knife switch assembly (3) is a current loop static contact, the current loop static contact is formed by bending a copper sheet, the two ends of the current loop static contact are bent outward to form a protruding Y-shaped closing clamp, the current loop static contact is connected to an adjacent copper rod (7) connected to the same current transformer through the copper sheet, when the copper blade (6) of the second knife switch assembly (3) is inserted into the Y-shaped closing clamp of the current loop static contact, the two copper rods (7) connected to the same current transformer form a current loop through the copper sheet (11); the copper rod (7) between the current transformer and the power supply is a whole copper rod (7); The box body (1) comprises a rear box cover (101), a front box cover (102) and a box seat (103); The operating handle (9) is a rectangular parallelepiped, which is formed by splicing a first cover (901) and a second cover (902).

2. The double-throw switching junction box according to claim 1, characterized in that: The box seat (103) is provided with fences around both the front and rear sides; the back of the box seat (103) is provided with convex ribs (104) to separate the copper rods (7); a socket is provided on the box seat (103), and the connecting seat (5) and the static contact (4) of the first switch blade assembly (2) are embedded in the socket; the static contact (4) of the second switch blade assembly (3) is arranged on a copper sheet (11) overlapped with the two copper rods (7), and the copper sheet (11) is arranged on the front of the box seat (103), and screws pass through the copper sheet (11), the box seat (103) and are connected with the copper rods (7).

3. The double-throw switching junction box according to claim 1, characterized in that: There are multiple sets of knife assemblies, including an A-phase knife assembly, a B-phase knife assembly, a C-phase knife assembly and a neutral-phase knife assembly, wherein the A-phase knife assembly, the B-phase knife assembly and the C-phase knife assembly all include a first knife assembly (2) and a second knife assembly (3), and the neutral-phase knife assembly includes the first knife assembly (2); wherein the copper rod (7) is divided into a first copper rod (701), a second copper rod (702), a third copper rod (703) and a fourth copper rod (704); wherein the first copper rod (701) and the second copper rod (702) are arranged in the same row, The lower connection end of the first copper rod (701) is a voltage connection end on the power supply side, the upper connection end of the second copper rod (702) is a voltage transformer connection end, and a first switch assembly (2) is arranged on the upper end of the first copper rod (701) and the lower end of the second copper rod (702); the third copper rod (703) and the fourth copper rod (704) are arranged in parallel; the upper connection ends of the third copper rod (703) and the fourth copper rod (704) are current transformer connection ends, and the lower connection ends of the third copper rod (703) and the fourth copper rod (704) are current connection ends on the power supply side; In the working state, the operating handle (9) is in the upper position, and the copper blade (6) electrically connected to the second copper rod (702) is inserted into the static contact (4) electrically connected to the first copper rod (701), so that the second copper rod (702) and the first copper rod (701) are at the same potential; and the copper blade (6) electrically connected to the third copper rod (703) and the static contact (4) electrically connected to the fourth copper rod (704) are in the disconnected state, so that the current passes through the double-throw switching junction box and the meter; thereby achieving the connection of the voltage circuit and the closing of the current circuit; In the inspection state, the operating handle (9) is in the lower position, and the copper blade (6) electrically connected to the second copper rod (702) is separated from the static contact (4) electrically connected to the first copper rod (701), so that the second copper rod (702) and the first copper rod (701) are not at the same potential; the copper blade (6) electrically connected to the third copper rod (703) is inserted into the static contact (4) electrically connected to the fourth copper rod (704), and the current flows back to the fourth copper rod (704) through the third copper rod (703) and the copper blade (11), thereby preventing the current from flowing through the meter through the double-throw switching junction box, and no current flows through the meter; thereby achieving the disconnection of the voltage circuit and the short-circuiting of the current circuit.

4. The double-throw switching junction box according to claim 2, characterized in that: The upper and lower parts of the box seat (103) are wiring parts. The front of the wiring part is provided with a raised limiting rib (105) and a through hole. The distance between the upper and lower limiting ribs (105) is greater than the width of the limiting cover (8). The through hole is inserted with a connecting screw for fastening the wire to the copper rod (7). The limiting cover (8) is provided with a plurality of vertical copper blade (6) grooves. The copper blade (6) is connected to the operating handle (9) after passing through the copper blade (6) grooves. The box seat (103) is provided with a positioning part between the upper and lower limiting ribs (105). The limiting cover (8) is inserted between the positioning part and the limiting rib (105). The positioning part and the limiting rib (105) cooperate to limit the displacement of the limiting cover (8). The limiting rib (105) is higher than the positioning part, and the fence is higher than the limiting rib (105).

5. The double-throw switching junction box according to claim 1, characterized in that: The first assembly cover (901) and the second assembly cover (902) are provided with slots matching the copper blade (6), the head of the copper blade (6) is provided with a plurality of notches, and the slots are provided with a plurality of protrusions capable of being embedded in the notches.

6. The double-throw switching junction box according to claim 2, characterized in that: The front box cover (102) is provided with an anti-opening ring (106) on both left and right sides, and the anti-opening ring (106) is provided with an anti-opening through hole extending vertically; the anti-opening through hole can correspond to the radial through hole of the head of the anti-opening nail (10); the anti-opening nail (10) passes through the front box cover (102) and is connected to the box seat (103).

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