A test junction box convenient for on-site operation and maintenance and its use method

Abstract

The present invention relates to a test junction box and a method for using the test junction box for facilitating on-site operation and maintenance operations, including a box body and a box cover, a plurality of voltage slots are arranged inside the box body, a current slot is arranged between adjacent voltage slots, a voltage conductive plate is installed in the voltage slot, and a current conductive plate is installed in the current slot; the voltage conductive plate is provided with internal voltage plug-in holes at the front and rear parts thereof to correspond to the external voltage wiring holes arranged on the box body, the current conductive plate includes a left column current conductive plate and a right column current conductive plate, the left column current conductive plate and the right column current conductive plate are both provided with internal current wiring holes at the front and rear parts thereof to correspond to the external current wiring holes arranged on the box body, and a voltage limit device, a current limit device, a meter change limit device and a disassembly and assembly buckle are arranged on the inner bottom surface of the box cover. The present invention has a simple structure, an ingenious design, is easy to use, has good operation reliability, test safety and anti-electricity theft performance, and effectively improves work efficiency.

Description

Technical Field

[0001] The invention relates to a test junction box which is convenient for on-site operation and maintenance and a use method thereof. Background Art

[0002] The junction box (short for the wiring test junction box) is an important device for metering field operations. It is widely installed between the electric energy metering device and the transformer connected via the transformer. When the metering operation requires the replacement of the electric energy meter under power or the calibration of the electric energy meter, the wiring circuit is changed by turning the voltage and current connection paddles in the junction box to achieve live calibration and replacement of the electric energy meter.

[0003] At present, most of the junction boxes used in metering sites still use the structure of traditional junction boxes. Traditional junction boxes have the following four pain points. First, the voltage and current connectors of traditional junction boxes are prone to wiring errors and safety risks. Operators may fail to move the connectors into place due to their skill level or negligence, resulting in errors in the metering line and affecting the metering data. Not only that, two screwdrivers are required to move the connectors. When moving, the screwdriver heads can easily touch other live terminals, resulting in an open circuit or short circuit, which poses a high safety risk. Then, the traditional junction box has insufficient anti-theft performance. Traditional junction boxes use threaded lead seals, and the lid has no protective shielding. It is very easy to install a stealing device, resulting in abnormal line loss, disrupting the electricity market, and easily causing power safety accidents. Secondly, the on-site test operation of traditional junction boxes is cumbersome. According to the operating procedures, it takes five screwdriver movements to turn a connection, which is cumbersome and affects work efficiency. Finally, the traditional junction box still has problems such as unclear markings and insufficient additional functions. Although some new junction boxes can improve the above pain points, there are problems with the structure that is not safe enough, such as changing the size of the junction box and adding springs. The layout of the old meter box is very compact. If the size of the junction box is increased, it will be impossible to install. The spring structure has problems with uncertain life and mechanical strength in different environments, and the spring structure is not safe enough. Summary of the invention

[0004] The present invention improves the above-mentioned problem, that is, the technical problem to be solved by the present invention is to provide a test junction box and a use method thereof which are convenient for on-site operation and maintenance, and are easy to use and efficient.

[0005] The present invention is constructed as follows: it includes a box body and a box cover; a plurality of voltage slots are arranged inside the box body; current slots are arranged between adjacent voltage slots; a voltage conductive plate is installed in the voltage slot; a current conductive plate is installed in the current slot; internal voltage plug-in holes are arranged at the front and rear of the voltage conductive plate to correspond to the external voltage wiring holes arranged on the box body; a voltage short-circuit screw is arranged in the middle of the voltage conductive plate; a voltage test terminal wrapped with insulation and directly inserted with a standard test wire is arranged in front of the voltage short-circuit screw; the current conductive plate includes a left column current conductive plate and a right column current conductive plate; the left column current conductive plate and the right column current conductive plate are both provided with internal current wiring holes at the front and rear to correspond to the external current wiring holes arranged on the box body. The holes correspond to each other, a current short-circuit screw is provided in the middle of the left column current conductive plate, and current test terminals which can be directly inserted with standard test wires and are insulated are provided at the front and rear of the left column current conductive plate. A meter changing hole and a spare groove for meter changing screws are provided between the left column current conductive plate and the right column current conductive plate, and the spare groove for meter changing screws is equipped with a meter changing screw which is used to be inserted into the meter changing hole to short-circuit the left column current conductive plate and the right column current conductive plate; a voltage limiting device, a current limiting device, a meter changing limiting device and a disassembly and assembly buckle are provided on the inner bottom surface of the box cover, the voltage limiting device and the voltage short-circuit screw are arranged in a one-to-one correspondence, the current limiting device and the current short-circuit screw are arranged in a one-to-one correspondence, the meter changing limiting device block and the meter changing hole correspond in a one-to-one correspondence, and the disassembly and assembly buckle corresponds to the box cover hole arranged on the box body.

[0006] Furthermore, a push-type lead seal groove is provided on one side of the surface of the box cover, and the push-type lead seal groove corresponds to the lead seal groove arranged on the box body. A bolt is provided in the push-type lead seal groove for passing through the push-type lead seal groove and fixing the box cover to the box body. A push-type lead seal is pressed in the push-type lead seal groove for sealing the push-type lead seal groove.

[0007] Furthermore, the voltage short-circuit screw, current short-circuit screw or meter-changing screw comprises an insulating high waist column, a connecting protrusion, a short-circuit plate, a screw, a gasket and a short-circuit nut arranged in sequence from top to bottom, the bottom of the insulating high waist column is provided with a connecting groove matching the connecting protrusion, the lower end of the screw passes through the gasket and cooperates with the short-circuit nut thread, the top of the insulating high waist column is provided with a screw cross mouth, the upper surface of the insulating high waist column is provided with anti-slip grooves, and ear screw handles are also provided on both sides of the insulating high waist column.

[0008] Furthermore, a crimping pliers is provided in both the inner current wiring hole and the inner voltage wiring hole, the lower surface of the crimping pliers is an arc-shaped surface, a convex groove is provided on the upper part of the crimping pliers, a convex block matching the convex groove is provided inside the convex groove, and the upper end of the convex block is connected to the connecting screws provided on the voltage conductive plate or the current conductive plate.

[0009] Furthermore, installation positioning holes are provided on the upper sides of the box body, a current hanging wire groove penetrating the left side of the box body and a hanging wire rod located in the current hanging wire groove are provided on the outside of the installation positioning hole on the left side, and a voltage hanging wire groove is provided in front of the installation positioning hole on the right side.

[0010] Furthermore, an inductor coil module is arranged below the short-circuit nut arranged in the voltage slot, and the inductor coil module is connected to the voltage indicator light arranged in front of the hole-changing meter through a wire.

[0011] Furthermore, the voltage limiting device and the current limiting device are cylindrical grooves protruding outward, so that when the voltage short-circuit screw or the current short-circuit screw is fully tightened, it just rests against the top surface of the cylindrical groove. The meter changing limit device is an inwardly protruding cylinder. Different meter changing limit devices have different colors. The box cover hole is an L-shaped slot for engaging with the disassembly and assembly buckle.

[0012] Furthermore, a dust cover is provided on the inner bottom surface of the box cover, and the inner wall of the dust cover is in contact with the outer wall of the combination; the front and back sides of the box cover are provided with U-shaped long grooves corresponding to the external voltage wiring holes and the external current wiring holes, the width of the U-shaped long grooves corresponding to the external current wiring holes is greater than the width of the U-shaped long grooves corresponding to the external voltage wiring holes, and a removable U-shaped plate is provided in the U-shaped long grooves.

[0013] Furthermore, a box body code is provided on the side of the box body, a transformer side mark and an electric energy meter side mark are provided on the front and rear parts of the box cover surface respectively, a transformer side mark and an electric energy meter side mark are also provided on the front and rear parts of the box body respectively, and a label changing screwing mark is provided behind the label changing hole.

[0014] Furthermore, a method for using a test junction box that facilitates on-site operation and maintenance operations includes the following: (1) When the junction box is operating normally, the voltage short-circuit screw and the current short-circuit screw are in a tightened state, the meter-changing screw is placed in the meter-changing screw spare slot, the voltage short-circuit screw and the current short-circuit screw are limited in the voltage limit device and the current limit device, and the meter-changing limit device is inserted into the meter-changing hole. If the voltage short-circuit screw, the current short-circuit screw or the meter-changing screw is not restored to its proper position, when the box cover is installed on the box body, the voltage short-circuit screw, the current short-circuit screw, and the meter-changing screw will interfere with the corresponding voltage limit device, current limit device, and meter-changing limit device, respectively, so that the box cover cannot be closed, thereby preventing the voltage short-circuit screw and the current short-circuit screw from being restored to their proper position due to erroneous operation; (2) When the meter calibration operation is required, the standard meter is passed through the current limit device. The test terminal is incorporated into the circuit of the transformer and the electric energy meter. By rotating the current short-circuit screw, the current short-circuit screw is withdrawn from the underlying conductive metal and the circuit is opened. At this time, the current flowing out of the transformer will first flow into the standard instrument and then into the electric energy meter, so that the standard instrument is connected in series to the electric energy meter circuit, achieving the purpose of comparing the electric energy meter with the standard instrument; (3) When it is necessary to screw in and out the voltage short-circuit screw, current short-circuit screw or meter change screw, the operator can wear insulating gloves and operate directly through the anti-slip grooves, and the ear handle can be used for auxiliary operation at the first time when it is necessary to screw in and out; when tightening the voltage short-circuit screw, current short-circuit screw or meter change screw, if the screw cannot short-circuit the current conductive plate or voltage conductive plate due to the manufacturer's manufacturing tolerance problem, the short-circuit can be achieved by using a short-circuit plate and a gasket to resist the current conductive plate or voltage conductive plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Aiming at the problems of poor operating reliability and test safety of traditional junction boxes, a compact current module is innovatively designed, and the original three-row current module is innovatively designed into a two-row structure, thereby reducing production costs and eliminating tedious operations of disconnecting connecting pieces; the arc-shaped pressure plate design of the wire crimping pliers arranged below the wiring screw increases the contact area between the connecting screw and the wire, which can not only avoid the pressure plate from pressing the skin, but also reduce the damage of the connecting screw to the wire, thereby improving operating reliability and test safety.

[0016] 2. In view of the problem of easy wiring errors in traditional junction boxes, voltage limit devices, current limit devices, and meter replacement limit devices are set to determine whether the junction box components have returned to normal metering status. At the same time, labels are added to the junction box and cover to prevent wiring errors and inverted installation of the junction box.

[0017] 3. In view of the poor anti-electricity theft performance of traditional junction boxes, the lead seal is designed as a push-type lead seal, the base is made of transparent plastic material, and the cover adopts a long-tail design to better prevent electricity theft.

[0018] 4. Aiming at the problem of cumbersome operation of traditional junction boxes, voltage test terminals and current test terminals are designed. The test wires can be directly plugged in in one step. At the same time, voltage and current hanging grooves are set on the left and right sides of the box body, which effectively improves the efficiency and convenience of on-site tests and shortens the time for calibration and replacement of meters.

[0019] 5. The size and mounting hole of the junction box of the present invention are consistent with those of the traditional junction box, which is convenient for on-site installation. At the same time, safety is taken into consideration, and the spring structure and active electronic structure are not used to solve the pain points of the traditional junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a junction box according to an embodiment of the present invention.

[0021] Figure 2 It is a schematic structural diagram of a box cover according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the side view of the junction box of the embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of a voltage conductive plate according to an embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the current conducting plate according to an embodiment of the present invention.

[0025] Figure 6 It is a schematic diagram of the structure of a voltage short-circuit screw according to an embodiment of the present invention.

[0026] Figure 7 It is a schematic diagram of the cooperation between the voltage limiting device and the voltage short-circuit screw according to an embodiment of the present invention.

[0027] Figure 8 It is a schematic diagram of the cooperation between the meter changing limit device and the meter changing short-circuit screw according to an embodiment of the present invention.

[0028] In the figure: 1-box cover; 11-voltage limit device; 12-current limit device; 13-meter change limit device; 14-disassembly and assembly buckle; 15-press-type lead seal slot; 16-press-type lead seal; 17-dust cover; 18-U-shaped long slot; 2-box body; 21-installation positioning hole; 22-box cover hole; 23-current hanging line groove; 24-hanging line rod; 25-lead seal slot; 26-voltage hanging line groove; 27-voltage slot; 28-current slot; 29-meter change screw; 210-voltage indicator light; 211-spare groove for meter change screw; 212- Inductor coil module; 213-wire; 214-box body code; 3-voltage conductive plate; 31-internal voltage plug hole; 32-external voltage wiring hole; 33-front voltage conductive block; 34-voltage short-circuit screw; 35-voltage test terminal; 4-current conductive plate; 41-internal current wiring hole; 42-external current wiring hole; 43-left column current conductive plate; 44-rear left column current conductive block; 45-current short-circuit screw; 46-right column current conductive plate; 47-meter change hole; 48-front left column current conductive block, 49-current test terminal, 51-gasket; 52-short-circuit nut; 61-screw; 62-short-circuit sheet; 63-insulating high waist column; 64-anti-slip pattern; 65-screw cross mouth; 66-ear screw handle; 67-connecting protrusion; 7-crimping pliers; 71-convex groove; 8-connecting screw. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example: Figure 1-8 As shown, in this embodiment, a test junction box is provided for facilitating on-site operation and maintenance, including a box body 2 and a box cover 1, wherein four voltage slots 27 are arranged inside the box body, and current slots 28 are arranged between adjacent voltage slots, wherein voltage conductive plates 3 are installed in the voltage slots, and current conductive plates 4 are installed in the current slots;

[0031] The front and rear parts of the voltage conductive plate are provided with a plurality of internal voltage plug-in holes 31, which are used to correspond to the external voltage wiring holes 32 provided on the box body. A voltage short-circuit screw 34 is provided in the middle of the voltage conductive plate, and a voltage test terminal 35 with insulation wrapped and directly inserted with a standard test wire is provided in front of the voltage short-circuit screw;

[0032] The current conducting plate 4 comprises a left column current conducting plate 43 and a right column current conducting plate 46. The front and rear parts of the left column current conducting plate and the right column current conducting plate are both provided with a plurality of internal current wiring holes 41 for corresponding to the external current wiring holes 42 provided on the box body. The middle part of the left column current conducting plate is provided with a current short-circuit screw 45. The front and rear parts of the left column current conducting plate are provided with current test terminals 49 for direct insertion of standard test wires and insulation wrapping. A meter changing hole 47 and a meter changing screw spare groove 211 are provided between the left column current conducting plate and the right column current conducting plate. The meter changing screw spare groove is provided with a meter changing screw 29 for inserting into the meter changing hole to short-circuit the left column current conducting plate and the right column current conducting plate.

[0033] The inner bottom surface of the box cover is provided with a voltage limit device 11, a current limit device 12, a meter-changing limit device 13 and a disassembly buckle 14. The voltage limit device is set in a one-to-one correspondence with the voltage short-circuit screw, the current limit device is set in a one-to-one correspondence with the current short-circuit screw, the meter-changing limit device block is set in a one-to-one correspondence with the meter-changing hole, and the disassembly buckle is set in a one-to-one correspondence with the box cover hole 22 set on the box body.

[0034] When the junction box is operating normally, the voltage short-circuit screw and the current short-circuit screw are in a tightened state, the meter changing screw is in the spare slot for the meter changing screw, the inner wall of the dust cover in the box cover is close to the inner wall of the box body, the voltage limit device and the current limit device limit the voltage short-circuit screw and the current short-circuit screw, and the meter changing limit device is inserted into the meter changing hole; if the voltage short-circuit screw, the current short-circuit screw or the meter changing screw is not restored to its place (for example, the voltage short-circuit screw and the current short-circuit screw are not tightened, and the meter changing screw is inserted into the meter changing hole without being reset), then when the box cover is installed on the box body, the voltage short-circuit screw, the current short-circuit screw and the meter changing screw will interfere with their corresponding voltage limit device, current limit device and meter changing limit device respectively, making it impossible to close the box cover, thereby preventing the operator from failing to restore the voltage short-circuit screw and the current short-circuit screw to their place due to incorrect operation or negligence, thereby avoiding measurement errors caused by open circuit or short circuit, and even personal safety accidents.

[0035] The inner current wiring hole and the inner voltage wiring hole are staggered up and down, and the aperture of the inner voltage wiring hole is smaller than the aperture of the inner current wiring hole. Corresponding marks are set beside each inner current wiring hole and inner voltage wiring hole.

[0036] The box body is made of transparent insulating plastic material, and the outer surfaces of the current conducting plate and the voltage conducting plate are provided with insulating shell layers.

[0037] The voltage conductive plate 3 comprises a front voltage conductive block 33 and a rear voltage conductive block 36, the voltage test terminal is arranged on the front voltage conductive block, and the voltage short-circuit screw is located between the front voltage conductive block and the rear voltage conductive block.

[0038] The above-mentioned left column current conductive plate includes the front left column current conductive block 48 and the rear left column current conductive block 44, and the right column current conductive plate is an integral structure.

[0039] The above-mentioned current test terminal is connected to the current conductive plate; therefore, the test wire of the test instrument can be directly plugged into the current test terminal and connected to the current conductive plate, without the need to use a screwdriver to loosen or tighten the wire crimping screw, thereby effectively improving the efficiency and convenience of on-site testing and shortening the time for calibration and replacement of meters.

[0040] When calibration is required, the standard meter can be easily connected to the circuit of the transformer and the electric energy meter through the current test terminal. By rotating the current short-circuit screw, the current short-circuit screw is withdrawn from the underlying conductive metal and the circuit is opened. At this time, the current flowing out of the transformer will first flow into the standard meter and then into the electric energy meter, so that the standard meter is connected in series to the electric energy meter circuit, achieving the purpose of comparing the electric energy meter with the standard meter. This operation is simple and safe, eliminating the tedious operation of disconnecting the connecting piece, and improving the convenience and safety of the operation.

[0041] In this embodiment, a push-type lead seal groove 15 is provided on one side of the surface of the box cover, and the push-type lead seal groove corresponds to the lead seal groove 25 provided on the box body. A bolt is provided in the push-type lead seal groove for passing through the push-type lead seal groove and fixing the box cover to the box body. A push-type lead seal 16 for sealing the push-type lead seal groove is pressed in the push-type lead seal groove. The push-type lead seal is a prior art, and the push-type lead seal seals the box cover and the box body by pressing.

[0042] In this embodiment, the voltage short-circuit screw, current short-circuit screw or meter-changing screw includes an insulating high waist column 63, a connecting protrusion 67, a short-circuit plate 62, a screw 61, a gasket 51 and a short-circuit nut 52 arranged in sequence from top to bottom. The bottom of the insulating high waist column is provided with a connecting groove that matches the connecting protrusion, the lower end of the screw passes through the gasket and matches with the short-circuit nut thread, the top of the insulating high waist column is provided with a screw cross mouth 65, the upper surface of the insulating high waist column is provided with anti-slip grooves 64, and ear screw handles 66 are also provided on both sides of the insulating high waist column.

[0043] The voltage short-circuit screw, the current short-circuit screw and the meter-changing screw are screwed in and out to control the on and off of the voltage conductive plate and the current conductive plate.

[0044] The upper surface of the insulating high waist column is higher than the upper surface of the box body, and the ear screw handle is also higher than the surface of the box body.

[0045] When it is necessary to screw in or out the voltage short-circuit screw, current short-circuit screw or meter changing screw, the operator can wear insulating gloves and operate directly through the anti-slip grooves, and the ear-tightening handle can be used for auxiliary operation when the first screwing in or out is required; when tightening the voltage short-circuit screw, current short-circuit screw or meter changing screw, if the screw cannot short-circuit the current and voltage conductive plates due to the manufacturer's manufacturing tolerance problem, the short-circuit can be achieved by using short-circuit plates and gaskets to support the current and voltage conductive plates.

[0046] In this embodiment, a crimping pliers 7 is provided in both the inner current wiring hole and the inner voltage wiring hole. The lower surface of the crimping pliers is an arc-shaped surface, and the test wire and the crimping pliers are in arc-shaped contact. Compared with the traditional test junction box, the contact area of ​​the present invention is larger, the wire is evenly stressed, and the wire can be better protected.

[0047] A convex groove 71 is provided on the upper part of the crimping pliers, a convex block matching with the convex groove is provided inside the convex groove, the convex block is embedded in the convex groove, and the upper end of the convex block is connected to the connecting screw 8 arranged on the voltage conductive plate or the current conductive plate.

[0048] The internal voltage wire insertion hole and the internal current wiring hole are separated by a crimping pliers, the upper space is square, and the lower space is arc-shaped; the width of the crimping pliers is adapted to the width of the internal voltage wire insertion hole and the internal current wiring hole.

[0049] In this embodiment, installation positioning holes 21 are provided on the upper sides of the box body, and the outer side of the installation positioning hole on the left side is provided with a current hanging wire groove 23 that passes through the left side of the box body and a hanging wire rod 24 located in the current hanging wire groove, and the front of the installation positioning hole on the right side is provided with a voltage hanging wire groove 26.

[0050] During on-site measurement operations, the test wiring hooks and Velcro can be hung on the wire hanging pole to facilitate on-site measurement operations and avoid safety hazards caused by wiring lines accidentally touching other live terminals.

[0051] The above-mentioned wire hanging groove is composed of a rectangular groove and an arc groove, and the arc groove can be a quarter of a spherical groove.

[0052] In this embodiment, an inductor module 212 is provided below the short-circuit nut in the voltage slot, and the inductor module is connected to a voltage indicator light 210 provided in front of the hole-changing meter via a wire 213 .

[0053] The voltage of the junction box voltage slot is usually 220V, 100V or 57.7V. It is very important to monitor whether the voltage slot is open circuit. When the voltage slot is turned on, the current generates a magnetic field, the inductor generates current, and the voltage indicator light is on.

[0054] In this embodiment, the voltage limiting device and the current limiting device are cylindrical grooves protruding outward, so that when the voltage short-circuit screw or the current short-circuit screw is fully tightened, it just rests against the top surface of the cylindrical groove. The meter changing limit device is an inwardly protruding cylinder. Different meter changing limit devices have different colors. The box cover hole 22 is an L-shaped slot for engaging with the disassembly and assembly buckle.

[0055] The three meter-changing limit devices can be yellow, green and red in sequence according to the order of the three phases A, B and C.

[0056] In this embodiment, a dust cover 17 is provided on the inner bottom surface of the box cover, and the inner wall of the dust cover is in contact with the outer wall of the combined body. After the box cover is installed, there is no gap between the inner wall of the box cover and the box body.

[0057] The front and rear sides of the box cover are provided with U-shaped long grooves 18 corresponding to the external voltage wiring holes and the external current wiring holes. The width of the U-shaped long grooves corresponding to the external current wiring holes is greater than the width of the U-shaped long grooves corresponding to the external voltage wiring holes. A detachable U-shaped plate is provided in the U-shaped long grooves.

[0058] In this embodiment, a box body code 214 is provided on the side of the box body, a transformer side mark and an electric energy meter side mark are provided on the front and rear parts of the box cover surface respectively, a transformer side mark and an electric energy meter side mark are also provided on the front and rear parts of the box body respectively, and a mark for tightening the mark for changing the mark is provided behind the mark-changing hole.

[0059] The box body coding not only ensures that the authenticity of the junction box can be checked, but the coding can also be recorded as an identification of the box-table relationship.

[0060] In this embodiment, the size of the box body can be consistent with the position of the installation positioning hole and the traditional junction box. The layout of the old meter box is very compact, and if the size of the junction box is increased, it will be impossible to install it.

[0061] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0062] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0063] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A test junction box that is convenient for on-site operation and maintenance, including a box body and a box cover, It is characterized in that A plurality of voltage slots are arranged inside the box body, and current slots are arranged between adjacent voltage slots. A voltage conductive plate is installed in the voltage slots, and a current conductive plate is installed in the current slots. The front and rear parts of the voltage conductive plate are provided with internal voltage plug-in holes to correspond to the external voltage wiring holes provided on the box body. The middle part of the voltage conductive plate is provided with a voltage short-circuit screw. In front of the voltage short-circuit screw, a voltage test terminal for direct insertion of a standard test wire and wrapped with insulation is provided. The current conducting plate comprises a left column current conducting plate and a right column current conducting plate, the front and rear parts of the left column current conducting plate and the right column current conducting plate are both provided with inner current wiring holes for corresponding to the outer current wiring holes provided on the box body, the middle part of the left column current conducting plate is provided with a current short-circuiting screw, the front and rear parts of the left column current conducting plate are provided with current test terminals for direct insertion of standard test wires and insulation wrapping, a meter changing hole and a meter changing screw spare groove are provided between the left column current conducting plate and the right column current conducting plate, and the meter changing screw spare groove is internally provided with a meter changing screw for inserting into the meter changing hole to short-circuit the left column current conducting plate and the right column current conducting plate; The inner bottom surface of the box cover is provided with a voltage limit device, a current limit device, a meter changing limit device and a disassembly buckle, the voltage limit device is arranged in a one-to-one correspondence with the voltage short-circuit screw, the current limit device is arranged in a one-to-one correspondence with the current short-circuit screw, the meter changing limit device block is arranged in a one-to-one correspondence with the meter changing hole, and the disassembly buckle is arranged in a one-to-one correspondence with the box cover hole arranged on the box body; The voltage short-circuit screw, current short-circuit screw or meter-changing screw comprises an insulating high waist column, a connecting protrusion, a short-circuit plate, a screw, a gasket and a short-circuit nut arranged in sequence from top to bottom. The bottom of the insulating high waist column is provided with a connecting groove that matches the connecting protrusion. The lower end of the screw passes through the gasket and matches with the short-circuit nut thread. The top of the insulating high waist column is provided with a screw cross mouth. The upper surface of the insulating high waist column is provided with anti-slip grooves, and ear screw handles are also provided on both sides of the insulating high waist column.

2. A test junction box that facilitates on-site operation and maintenance according to claim 1, It is characterized in that The inner current wiring hole and the inner voltage wiring hole are both provided with crimping pliers, the lower surface of the crimping pliers is an arc-shaped surface, the upper part of the crimping pliers is provided with a convex groove, the inside of the convex groove is provided with a convex block matching the convex groove, and the upper end of the convex block is connected to the connecting screws arranged on the voltage conductive plate or the current conductive plate.

3. A test junction box that facilitates on-site operation and maintenance according to claim 1, It is characterized in that A push-type lead seal groove is provided on one side of the surface of the box cover, and the push-type lead seal groove corresponds to the lead seal groove provided on the box body. A bolt is provided in the push-type lead seal groove for passing through the push-type lead seal groove and fixing the box cover to the box body. A push-type lead seal is pressed in the push-type lead seal groove for sealing the push-type lead seal groove.

4. A test junction box that facilitates on-site operation and maintenance according to claim 1, It is characterized in that The box body is provided with installation positioning holes on both sides. The outer side of the installation positioning hole on the left side is provided with a current hanging wire groove that passes through the left side of the box body and a hanging wire rod located in the current hanging wire groove. The front of the installation positioning hole on the right side is provided with a voltage hanging wire groove.

5. A test junction box that facilitates on-site operation and maintenance according to claim 1, It is characterized in that An inductor coil module is arranged below the short-circuit nut arranged in the voltage slot, and the inductor coil module is connected with a voltage indicator light arranged in front of the hole-changing meter through a wire.

6. A test junction box that facilitates on-site operation and maintenance according to claim 1, It is characterized in that The voltage limiting device and the current limiting device are cylindrical grooves protruding outward, which are used to press against the top surface of the cylindrical groove when the voltage short-circuit screw or the current short-circuit screw is fully tightened. The meter changing limit device is an inwardly protruding cylinder. Different meter changing limit devices have different colors. The box cover hole is an L-shaped slot for engaging with the disassembly and assembly buckle.

7. A test junction box that facilitates on-site operation and maintenance according to claim 1, It is characterized in that A dust cover is provided on the inner bottom surface of the box cover, and the inner wall of the dust cover is in contact with the outer wall of the combined body; the front and rear surfaces of the box cover are provided with U-shaped long grooves corresponding to the external voltage wiring holes and the external current wiring holes, the width of the U-shaped long groove corresponding to the external current wiring holes is greater than the width of the U-shaped long groove corresponding to the external voltage wiring holes, and a detachable U-shaped plate is provided in the U-shaped long groove.

8. A test junction box that facilitates on-site operation and maintenance according to claim 1, It is characterized in that The side of the box body is provided with a box body code, the front and rear parts of the box cover surface are respectively provided with a transformer side mark and an electric energy meter side mark, the front and rear parts of the box body are also respectively provided with a transformer side mark and an electric energy meter side mark, and a mark for tightening the mark for changing the mark is provided behind the mark-changing hole.

9. A method for using the test junction box for facilitating on-site operation and maintenance as claimed in claim 1, It is characterized in that Including as follows: (1) When the junction box is operating normally, the voltage short-circuit screw and the current short-circuit screw are in a tightened state, the meter-changing screw is placed in the spare slot for the meter-changing screw, the voltage short-circuit screw and the current short-circuit screw are limited in the voltage limit device and the current limit device, and the meter-changing limit device is inserted into the meter-changing hole. If the voltage short-circuit screw, the current short-circuit screw or the meter-changing screw is not restored to its proper position, when the box cover is installed on the box body, the voltage short-circuit screw, the current short-circuit screw and the meter-changing screw will interfere with the corresponding voltage limit device, the current limit device and the meter-changing limit device respectively, so that the box cover cannot be closed, thereby preventing the voltage short-circuit screw and the current short-circuit screw from being restored to their proper position due to incorrect operation; (2) When it is necessary to calibrate the meter, connect the standard meter to the transformer and the electric energy converter through the current test terminal. In the circuit of the meter, by rotating the current short-circuit screw, the current short-circuit screw is withdrawn from the bottom conductive metal, and the circuit is open. At this time, the current flowing out of the transformer will first flow into the standard instrument and then into the electric energy meter, so that the standard instrument is connected in series to the circuit of the electric energy meter, and the purpose of comparing the electric energy meter with the standard instrument is achieved; (3) When it is necessary to screw in and out the voltage short-circuit screw, the current short-circuit screw or the meter replacement screw, the operator can wear insulating gloves and operate directly through the anti-slip grooves, and the ear handle can be used for auxiliary operation at the first time when it is necessary to screw in and out; when tightening the voltage short-circuit screw, the current short-circuit screw or the meter replacement screw, if the screw cannot short-circuit the current conductive plate or the voltage conductive plate due to the manufacturer's manufacturing tolerance problem, the short-circuit can be achieved by using a short-circuit plate and a gasket to resist the current conductive plate or the voltage conductive plate.

Images