A pluggable three-phase intelligent electric energy meter

Abstract

The present invention provides a pluggable three-phase smart electric energy meter, including a smart meter body, which is connected by a communication module. A concentrator is installed at the bottom of the smart meter body, and a plurality of installation grooves are arranged on one side of the smart meter body. Fixing devices are arranged inside the plurality of installation grooves. A first positive electrode sheet and a first negative electrode sheet will contact the second negative electrode sheet and the second negative electrode sheet. At this time, a DC motor driving shaft rotates in the positive direction, and a pressing component moves upward. When the first positive electrode sheet contacts the second negative electrode sheet and the second negative electrode sheet contacts the first positive electrode sheet, the pressing component moves downward. At this time, the end of an external cable is fixed by the pressing component. For pulling out the end of the cable, it is only necessary to make the first positive electrode sheet and the first negative electrode sheet contact the second negative electrode sheet and the second negative electrode sheet again. At this time, the cable can be loosened to realize pulling out the end of the cable. The device is convenient for installing and removing the cable end, and has a simple structure and is easy to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of three-phase smart meters, and in particular to a pluggable three-phase smart electric energy meter. Background Art

[0002] The three-phase smart energy meter is a power metering device that combines three-phase electricity technology and smart meter functions. It uses advanced electronic technology and communication technology to achieve accurate measurement and remote monitoring of electric energy. It is an indispensable part of the modern power system. The three-phase smart energy meter is a smart meter designed for three-phase electricity. It combines three-phase electricity and smart meter technology.

[0003] Existing three-phase smart meters usually include a smart meter body, and a plurality of metal terminals are arranged on one side of the smart meter body. The plurality of metal terminals are all provided with bolts and fixing holes. In the process of externally connecting the smart meter body with cables, the external cable is placed at the position of the fixing hole and fixedly installed at the position of the fixing hole by bolts. However, the existing method of fixing by bolts requires the position of the end of the external cable to be tightened by the bolts. During the tightening process, the bolts are constantly rotating, and the end position of the cable may move downward along with the thread of the bolt, and the end position of the cable may be stuck with the position of the thread. This method of fixing the cable end position by twisting the cable end is prone to causing twisting damage to the cable end.

[0004] Therefore, it is necessary to provide a new pluggable three-phase smart electric energy meter to solve the above technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a pluggable three-phase smart electric energy meter.

[0006] The present invention provides a pluggable three-phase smart energy meter, a pluggable three-phase smart energy meter, comprising a smart meter body, the smart meter body is connected by a communication module, a concentrator is installed at the bottom of the smart meter body, a plurality of installation slots are arranged on one side of the smart meter body, and a fixing device is arranged inside each of the plurality of installation slots;

[0007] The fixing device includes a DC motor, a fixing block, a pressing assembly, a clamping group and a power block, wherein the DC motor is arranged inside the fixing block, and a first positive electrode sheet and a first negative electrode sheet are fixedly arranged at the bottom end of the power block, and the first positive electrode sheet and the first negative electrode sheet extend away from one end of the power block into two sliding through grooves arranged on the fixing block, and a second positive electrode sheet and a second negative electrode sheet are arranged on the DC motor, and the bottom ends of the first positive electrode sheet and the first negative electrode sheet respectively match the shapes and sizes of the upper ends of the second positive electrode sheet and the second negative electrode sheet, and the bottom ends of the first positive electrode sheet and the first negative electrode sheet match the shapes and sizes of the upper ends of the second positive electrode sheet and the second negative electrode sheet. The upper ends of the pole pieces are in contact. When the first positive pole piece is in contact with the second positive pole piece and the first negative pole piece is in contact with the second negative pole piece, the DC motor drive shaft rotates in the forward direction. When the first positive pole piece is in contact with the second negative pole piece and the second positive pole piece is in contact with the first negative pole piece, the DC motor drive shaft rotates in the reverse direction. The drive shaft of the DC motor is connected to the pressing component, and the DC motor drives the pressing component to perform reciprocating motion in the vertical direction. When the DC motor drive shaft rotates in the forward direction, the pressing component will move upward. When the DC motor drive shaft rotates in the reverse direction, the pressing component will move downward, and the movement of the pressing component will synchronously drive the clamping group to move.

[0008] Furthermore, the pressing assembly includes a pressing plate and a threaded rod, the DC motor drive shaft is fixedly connected to one end of the threaded rod, the bottom end of the threaded rod is movably connected to the inner bottom side of the mounting groove, one end of the threaded rod close to the bottom side of the mounting groove passes through the pressing plate, the threaded rod is threadedly connected to the pressing plate, one side of the pressing plate is connected to one side of the clamping group, and the bottom of the pressing plate is flat.

[0009] Furthermore, the clamping group includes a first clamping plate, a second clamping plate, a first connecting column and a second connecting column, one end of the first connecting column and the second connecting column are fixedly connected to one side of the pressing plate, the length of the first connecting column is smaller than the length of the second connecting column, the end of the first connecting column away from the pressing plate is movably set in a first sliding groove set on the first clamping plate, the first sliding groove is inclined from the side of the first clamping plate away from the second clamping plate to the side close to the second clamping plate, the end of the second connecting column away from the pressing plate is movably set in the second sliding groove on the second clamping plate, the second sliding groove is inclined from the side of the second clamping plate away from the first clamping plate to the side close to the first clamping plate, the first clamping plate and the second clamping plate are staggered, and the adjacent sides of the first clamping plate and the second clamping plate are both provided with arc-shaped through grooves.

[0010] Furthermore, a metal terminal is fixedly connected to the inner bottom side of the mounting groove.

[0011] Furthermore, a fixing groove is provided on the metal terminal, a partition frame is provided inside the fixing groove, the partition frame is provided on the outer side wall of the threaded rod, and the upper end of the partition frame passes through the pressing plate.

[0012] Furthermore, a support plate for supporting the DC motor is arranged inside the fixing block.

[0013] Furthermore, the communication module includes a phase identification module, a sampling module, a transmission module and a management module;

[0014] Phase identification module: used to identify the phase to which the smart meter body belongs, wherein an MCU unit is arranged inside the smart meter body;

[0015] Sampling module: collects the current signal on the phase identified by the phase identification module and converts the current signal data into a digital format;

[0016] Transmission module: transmits the collected data to the management module, which controls the use of energy;

[0017] Management module: used to manage and schedule energy usage.

[0018] Furthermore, the specific operation process of the phase recognition module is as follows:

[0019] S1: The concentrator device installed under the transformer is connected to the three-phase power of A, B, C, and N on the smart meter body, and collects the zero-crossing signals of A and N;

[0020] S2: The centralized acquisition device periodically sends a phase identification signal. When sending a phase detection signal, the concentrator only sends a very short information frame when the A phase crosses the zero point;

[0021] S3: The smart meter collects the time of the zero-crossing signal of the phase where the smart meter is located through the MCU unit, and then compares it with the time of the received concentrator signal to calculate the zero-crossing time of the phase where the smart meter is located and the time difference of data packet reception;

[0022] S4: Determine the phase where the smart meter is located by repeatedly calculating and comparing the time difference of each phase of the concentrator.

[0023] Furthermore, a plurality of registers are provided in the sampling module.

[0024] Furthermore, the transmission module establishes a communication connection with the management module, and transmits the electric energy data stored in the register in the sampling module to the management module through the established communication connection.

[0025] Compared with the related art, the pluggable three-phase smart energy meter provided by the present invention has the following beneficial effects:

[0026] 1. In specific use, the initial state of the pressing plate is to fit on the metal terminal, and then the power block is placed on the fixed block. During this process, the first positive electrode sheet and the first negative electrode sheet will contact the second negative electrode sheet and the second negative electrode sheet. At this time, the DC motor drive shaft rotates in the positive direction, and the pressing plate moves upward. At this time, the external cable end can be inserted into the bottom of the pressing plate, and then when the first positive electrode sheet contacts the second negative electrode sheet, and the second negative electrode sheet contacts the first positive electrode sheet, the pressing plate will move downward. At this time, the end of the external cable will be fixed by the pressing plate, wherein the bottom of the pressing plate at this place is in a flat state, so that when the pressing plate moves downward, it contacts and fixes the cable end with uniform pressure. The uniformly distributed pressure helps to avoid excessive local pressure on the cable end, thereby reducing damage to the cable end, and the flat bottom of the pressing plate can ensure that the contact area between the cable end and the pressing plate during the fixing process is maximized, thereby dispersing the pressure on the contact point and reducing the wear caused by friction;

[0027] During the above-mentioned fixing process, the pressing plate will synchronously drive the clamping group to move when it moves downward, and the cable will be further fixed by the clamping group to improve the overall fixing effect. To pull out the cable end, you only need to re-contact the first positive electrode sheet and the first negative electrode sheet with the second negative electrode sheet and the second negative electrode sheet. At this time, you can loosen the cable to pull out the cable end. The device is more convenient for installing and removing the cable ends, has a simple structure, and is easy to operate.

[0028] 2. By setting the bottom ends of the first positive electrode sheet and the first negative electrode sheet to match the shape and size of the upper ends of the second positive electrode sheet and the second negative electrode sheet respectively, and the first positive electrode sheet and the first negative electrode sheet extending away from the end of the power block to the inside of the fixed block, the method for driving the DC motor is limited, so that the overall device requires a specific first positive electrode sheet and a first negative electrode sheet to drive the DC motor, making the overall device safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the overall structure of a pluggable three-phase smart electric energy meter provided by the present invention;

[0030] Figure 2 A schematic diagram of a pluggable three-phase smart electric energy meter provided by the present invention from another perspective;

[0031] Figure 3 A partial disassembled diagram of the pluggable three-phase smart electric energy meter provided by the present invention;

[0032] Figure 4 A partial cross-sectional view of the pluggable three-phase smart electric energy meter provided by the present invention;

[0033] Figure 5A schematic diagram of a fixing device provided by the present invention;

[0034] Figure 6 A disassembled diagram of the fixing device provided by the present invention;

[0035] Figure 7 A schematic diagram of a first clamping plate and a second clamping plate provided by the present invention;

[0036] Figure 8 A schematic diagram of a power supply block provided by the present invention;

[0037] Fig. 9 A schematic diagram of another viewing angle of the fixing device provided by the present invention;

[0038] Fig.10 This is a system block diagram of the communication module provided by the present invention.

[0039] Numbers in the figure: 1. Smart meter body; 2. Power block; 3. Fixed block; 4. First clamping plate; 5. Second clamping plate; 6. Metal terminal; 7. DC motor; 8. Partition frame; 9. Sliding groove; 10. Support plate; 11. First sliding groove; 12. Second sliding groove; 13. Pressing plate; 14. Threaded rod; 15. First connecting column; 16. Second connecting column; 17. Second positive electrode sheet; 18. Second negative electrode sheet; 19. First positive electrode sheet; 20. First negative electrode sheet. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0041] Please refer to Figure 1-Figure 10 ,in, Figure 1 A schematic diagram of the overall structure of a pluggable three-phase smart electric energy meter provided by the present invention; Figure 2 A schematic diagram of a pluggable three-phase smart electric energy meter provided by the present invention from another perspective; Figure 3 A partial disassembled diagram of the pluggable three-phase smart electric energy meter provided by the present invention; Figure 4 A partial cross-sectional view of the pluggable three-phase smart electric energy meter provided by the present invention; Figure 5 A schematic diagram of a fixing device provided by the present invention; Figure 6 A disassembled diagram of the fixing device provided by the present invention; Figure 7 A schematic diagram of a first clamping plate and a second clamping plate provided by the present invention; Figure 8 A schematic diagram of a power supply block provided by the present invention; Fig. 9 A schematic diagram of another viewing angle of the fixing device provided by the present invention; Fig.10 This is a system block diagram of the communication module provided by the present invention.

[0042] In the specific implementation process, Figure 1-Figure 10As shown, a pluggable three-phase smart energy meter includes a smart meter body 1, the smart meter body 1 is connected by a communication module, a concentrator is installed at the bottom of the smart meter body 1, a plurality of mounting grooves are arranged on one side of the smart meter body 1, a fixing device is arranged inside each of the plurality of mounting grooves, and a metal terminal 6 is fixedly connected to the bottom side of the plurality of mounting grooves;

[0043] The fixing device includes a DC motor 7, a fixing block 3, a pressing assembly, a clamping group and a power block 2. The DC motor 7 is arranged inside the fixing block 3. The bottom end of the power block 2 is fixedly provided with a first positive electrode sheet 19 and a first negative electrode sheet 20. The first positive electrode sheet 19 and the first negative electrode sheet 20 extend away from one end of the power block 2 to two sliding through grooves 9 arranged on the fixing block 3. The DC motor 7 is provided with a second positive electrode sheet 17 and a second negative electrode sheet 18. The bottom ends of the first positive electrode sheet 19 and the first negative electrode sheet 20 are matched with the upper ends of the second positive electrode sheet 17 and the second negative electrode sheet 18 in shape and size respectively. The bottom ends of the first positive electrode sheet 19 and the first negative electrode sheet 20 are matched with the second positive electrode sheet 17 in shape and size. and the upper end of the second negative electrode sheet 18. When the first positive electrode sheet 19 contacts the second positive electrode sheet 17 and the first negative electrode sheet 20 contacts the second negative electrode sheet 18, the driving shaft of the DC motor 7 rotates in the forward direction. When the first positive electrode sheet contacts the second negative electrode sheet and the second positive electrode sheet contacts the first negative electrode sheet, the driving shaft of the DC motor 7 rotates in the reverse direction. The driving shaft of the DC motor 7 is connected to the pressing assembly. The DC motor 7 drives the pressing assembly to perform reciprocating motion in the vertical direction. When the driving shaft of the DC motor 7 rotates in the forward direction, the pressing assembly moves upward. When the driving shaft of the DC motor 7 rotates in the reverse direction, the pressing assembly moves downward, and the movement of the pressing assembly synchronously drives the clamping group to move.

[0044] During specific use, the initial state of the pressing component is that it is attached to the metal terminal 6, and then the power block 2 is placed on the fixed block 3. During this process, the first positive electrode sheet 19 and the first negative electrode sheet 20 will contact the second negative electrode sheet 18 and the second negative electrode sheet 18. At this time, the DC motor 7 drive shaft rotates forward, and the pressing component moves upward. At this time, the end of the external cable can be inserted into the bottom of the pressing component, and then the first positive electrode sheet 19 is in contact with the second negative electrode sheet 18, and the second negative electrode sheet 18 is in contact with the first positive electrode sheet 19. At this time, the pressing component will move downward. At this time, the end of the external cable will be fixed by the pressing component, and during this fixing process, the pressing component will synchronously drive the clamping group to move when it moves downward, and the cable will be further fixed by the clamping group to improve the overall fixing effect;

[0045] To remove the cable end, it is only necessary to re-contact the first positive electrode sheet 19 and the first negative electrode sheet 20 with the second negative electrode sheet 18 and the second negative electrode sheet 18, and then the cable can be loosened to realize the removal of the cable end. The device is convenient for installing and removing the cable end, has a simple structure, and is easy to operate.

[0046] By arranging the bottom ends of the first positive electrode sheet 19 and the first negative electrode sheet 20 to match the shapes and sizes of the upper ends of the second positive electrode sheet 17 and the second negative electrode sheet 18, respectively, and the ends of the first positive electrode sheet 19 and the first negative electrode sheet 20 away from the power block 2 extend to the inside of the fixed block 3, the method for driving the DC motor 7 becomes limited, so that the overall device requires a specific first positive electrode sheet 19 and a first negative electrode sheet 20 to realize driving the DC motor, so that the overall device is safer;

[0047] The pressing assembly includes a pressing plate 13 and a threaded rod 14, the driving shaft of the DC motor 7 is fixedly connected to one end of the threaded rod 14, the bottom end of the threaded rod 14 is movably connected to the inner bottom side of the mounting groove, the end of the threaded rod 14 close to the bottom side of the mounting groove passes through the pressing plate 13, the threaded rod 14 is threadedly connected to the pressing plate 13, one side of the pressing plate 13 is connected to one side of the clamping group, and the bottom of the pressing plate is in a flat state;

[0048] Specifically, the threaded rod 14 is a bidirectional threaded rod 14. When the threaded rod 14 is rotated in the forward direction, the pressing plate 13 can be moved downward by the rotation of the threaded rod 14. At this time, the end position of the cable can be fixed by the pressing plate 13. When the threaded rod 14 is rotated in the reverse direction, the pressing plate 13 can move to a position away from the end position of the cable. At this time, the cable end can be pulled out from the inside of the device.

[0049] The clamping group includes a first clamping plate, a second clamping plate, a first connecting column and a second connecting column, one end of the first connecting column and the second connecting column is fixedly connected to one side of the pressing plate, the length of the first connecting column is less than the length of the second connecting column, the end of the first connecting column away from the pressing plate is movably arranged in a first sliding groove arranged on the first clamping plate, the first sliding groove is inclined from the side of the first clamping plate away from the second clamping plate to the side close to the second clamping plate, the end of the second connecting column away from the pressing plate is movably arranged in the second sliding groove on the second clamping plate, the second sliding groove is inclined from the side of the second clamping plate away from the first clamping plate to the side close to the first clamping plate, the first clamping plate and the second clamping plate are staggered, the adjacent sides of the first clamping plate and the second clamping plate are both provided with arc-shaped through grooves, and a support plate 10 for supporting the DC motor 7 is provided inside the fixed block 3;

[0050] Specifically, during use, when the threaded rod 14 rotates forward, the threaded rod 14 drives the pressing plate 13 to move downward. At this time, since one end of the first connecting column 15 and the second connecting column 16 are fixedly connected to one side of the pressing plate 13, the length of the first connecting column 15 is smaller than the length of the second connecting column 16. The end of the first connecting column 15 away from the pressing plate 13 is movably arranged on the first clamping plate 4 and is inclined from the side of the first clamping plate 4 away from the second clamping plate 5 to the side of the second clamping plate 5. The end of the second connecting column 16 away from the pressing plate 13 is movably arranged on the second clamping plate 5 and is inclined from the side of the second clamping plate 5 away from the first clamping plate 4 to the side of the first clamping plate 4. The second sliding groove 12 is inclined from the side of the second clamping plate 5 away from the first clamping plate 4. At this time, since the first connecting column 15 and the second connecting column 16 will move downward with the pressing plate 13, the first connecting column 15 and the second connecting column 16 will move downward with the pressing plate 13. The column 15 and the second connecting column 16 are movably arranged in the first sliding groove 11 and the second sliding groove 12 respectively. When the first connecting column 15 and the second connecting column 16 move downward, the first clamping plate 4 and the second clamping plate 5 are driven to move in adjacent directions. Since the first clamping plate 4 and the second clamping plate 5 are staggered, the staggered connection clamping method can provide a more stable clamping effect, and the staggered connection clamping method makes the installation and maintenance of the cable more convenient. When it is necessary to add, replace or check the cable, it is easier to find and contact the target cable without worrying about conflict or entanglement with other cables, which helps to improve work efficiency and reduce maintenance costs. The staggered setting between the first clamping plate 4 and the second clamping plate 5 can create more gaps, which are conducive to air circulation, increase the heat dissipation area, and improve the heat dissipation performance of the system.

[0051] The arrangement of the arc-shaped through grooves on the first clamping plate 4 and the second clamping plate 5 ensures that when the first clamping plate 4 and the second clamping plate 5 move toward each other, the first connecting column 15 and the second connecting column 16 will not generate movement conflict when they move with the first clamping plate 4 and the second clamping plate 5.

[0052] A fixing groove is provided on the metal terminal 6, and a partition frame 8 is provided inside the fixing groove. The partition frame 8 is provided on the outer side wall of the threaded rod 14, and the upper end of the partition frame 8 passes through the pressing plate 13. The partition frame 8 is provided at this location, and when the cable enters the interior of the installation groove, the end position of the cable will contact the partition frame 8, and the end position of the cable can be separated from the position of the threaded rod 14 by the partition frame 8. On the one hand, the threaded rod 14 has a conductive function and affects the use of the overall equipment. On the other hand, the end position of the cable is prevented from being entangled on the threaded rod 14, which ensures the stability of the overall equipment operation.

[0053] The communication module includes a phase identification module, a sampling module, a transmission module and a management module;

[0054] Phase identification module: used to identify the phase to which the smart meter body 1 belongs, wherein an MCU unit is provided inside the smart meter body 1;

[0055] Sampling module: collects the current signal on the phase identified by the phase identification module and converts the current signal data into a digital format;

[0056] Transmission module: transmits the collected data to the management module, which controls the use of energy;

[0057] Management module: used to manage and schedule energy usage.

[0058] The specific operation process of the phase recognition module is as follows:

[0059] S1: The concentrator device installed under the transformer is connected to the three-phase power of A, B, C, and N of the smart meter body 1, and collects the zero-crossing signals of A and N. The zero-crossing signal is the moment when the current or voltage waveform changes from positive to negative or from negative to positive. It is an important reference point in the power system. By monitoring these zero-crossing signal points, the time between each phase is synchronized;

[0060] S2: The centralized acquisition device periodically sends a phase identification signal. When sending a phase detection signal, the concentrator only sends a very short information frame when the A phase crosses the zero point;

[0061] S3: The smart meter body 1 collects the time of the zero-crossing signal of the phase where the smart meter body 1 is located through the MCU unit, and then compares it with the time of the received concentrator signal to calculate the zero-crossing time of the phase where the smart meter body 1 is located and the data packet reception time difference;

[0062] S4: By repeatedly calculating and comparing the time difference of each phase of the concentrator, the phase of the smart meter body 1 is determined. Specifically, if the time difference calculated by the smart meter body 1 is relatively stable and close to a certain expected value, it can be preliminarily determined that the smart meter body 1 is connected to phase A. If the time difference is significantly greater than or less than the expected value of phase A, it can be compared with the theoretical phase difference of phase B and phase C to determine whether the smart meter body 1 is connected to phase B or phase C.

[0063] In a specific implementation process:

[0064] Expected time difference of phase A: Assuming that in an ideal situation without delay, the concentrator sends a signal and the phase A of smart meter body 1 crosses zero at almost the same time. However, due to signal transmission and processing delays, we preset a non-zero expected time difference of 50μs (microseconds). The power grid is standard, phase B has a phase difference of 120 degrees relative to phase A, and phase C has a phase difference of 240 degrees relative to phase A. In a 50Hz power system, the time corresponding to each degree of phase difference is = 55.56μs. Therefore, the theoretical time of phase B relative to phase A is = 120×55.56μs = 6.67ms (milliseconds), and the theoretical time difference of phase C relative to phase A is 240×55.56μs = 13.33ms. After multiple measurements, the samples obtained are: sample 1: 48μs, sample 2: 52μs, sample 3: 51μs. At this time, most of the time difference samples are close to the preset expected time difference of phase A, and it can be preliminarily determined that the smart meter body 1 is connected to phase A.

[0065] There are multiple registers in the sampling module, and the specific usage of the sampling module is as follows:

[0066] First, an analog-to-digital converter is used to sample the current signal data. The sampled data is transmitted to the external metering chip, which actively pushes the metering data to the UART DMA channel of the MCU unit in a reporting manner. The data is parsed in the half-full and full-full interrupts of the UART DMA and divided into active, reactive, and apparent energy. The UART DMA processes the parsed data and writes the active, reactive, and apparent energy metering parameters into the corresponding registers.

[0067] The transmission module establishes a communication connection with the management module, and transmits the electric energy data stored in the register in the sampling module to the management module through the established communication connection.

[0068] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0069] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pluggable three-phase smart energy meter, characterized in that: The smart meter body (1) comprises a smart meter body (1), wherein the smart meter body (1) is connected by a communication module, a concentrator is installed at the bottom of the smart meter body (1), a plurality of installation grooves are arranged on one side of the smart meter body (1), and a fixing device is arranged inside each of the plurality of installation grooves; The fixing device comprises a DC motor (7), a fixing block (3), a pressing component, a clamping group and a power block (2); the DC motor (7) is arranged inside the fixing block (3); a first positive electrode sheet (19) and a first negative electrode sheet (20) are fixedly arranged at the bottom end of the power block (2); the first positive electrode sheet (19) and the first negative electrode sheet (20) extend from one end of the power block (2) to two sliding grooves (9) arranged on the fixing block (3); a second positive electrode sheet (17) and a second negative electrode sheet (18) are arranged on the DC motor (7); the bottom ends of the first positive electrode sheet (19) and the first negative electrode sheet (20) are respectively matched in shape and size with the upper ends of the second positive electrode sheet (17) and the second negative electrode sheet (18); the bottom ends of the first positive electrode sheet (19) and the first negative electrode sheet (20) are in contact with the upper ends of the second positive electrode sheet (17) and the second negative electrode sheet (18); the movement of the pressing component will synchronously drive the clamping group to perform a clamping movement; The pressing assembly comprises a pressing plate (13) and a threaded rod (14), the driving shaft of the DC motor (7) is fixedly connected to one end of the threaded rod (14), the bottom end of the threaded rod (14) is movably connected to the inner bottom side of the mounting groove, the end of the threaded rod (14) close to the bottom side of the mounting groove passes through the pressing plate (13), the threaded rod (14) is threadedly connected to the pressing plate (13), one side of the pressing plate (13) is connected to one side of the clamping group, and the bottom of the pressing plate is in a flat state; The clamping group comprises a first clamping plate (4), a second clamping plate (5), a first connecting column (15) and a second connecting column (16); one end of the first connecting column (15) and the second connecting column (16) are fixedly connected to one side of the pressing plate (13); the length of the first connecting column (15) is smaller than the length of the second connecting column (16); one end of the first connecting column (15) away from the pressing plate (13) is movably arranged in a first sliding groove (11) arranged on the first clamping plate (4); the first sliding groove (11) is formed by the first clamping plate (4) The second clamping plate (5) is tilted away from the side of the second clamping plate (5) toward the side close to the second clamping plate (5); one end of the second connecting column (16) away from the pressing plate (13) is movably arranged in the second sliding groove (12) on the second clamping plate (5); the second sliding groove (12) is tilted from the side of the second clamping plate (5) away from the first clamping plate (4) toward the side close to the first clamping plate (4); the first clamping plate (4) and the second clamping plate (5) are staggered; arc-shaped through grooves are arranged on adjacent sides of the first clamping plate (4) and the second clamping plate (5).

2. The pluggable three-phase smart energy meter according to claim 1, characterized in that: A metal terminal (6) is fixedly connected to the inner bottom side of the installation groove.

3. The pluggable three-phase smart electric energy meter according to claim 2, characterized in that: The metal terminal (6) is provided with a fixing groove, a partition frame (8) is provided inside the fixing groove, the partition frame (8) is provided on the outer side wall of the threaded rod (14), and the upper end of the partition frame (8) passes through the pressing plate (13).

4. The pluggable three-phase smart electric energy meter according to claim 3, characterized in that: A support plate (10) for supporting the DC motor (7) is arranged inside the fixed block (3).

5. The pluggable three-phase smart energy meter according to claim 4, characterized in that: The communication module includes a phase identification module, a sampling module, a transmission module and a management module; A phase identification module: used for identifying the phase to which the smart meter body (1) belongs, wherein an MCU unit is arranged inside the smart meter body (1); Sampling module: collects the current signal on the phase identified by the phase identification module and converts the current signal data into a digital format; Transmission module: transmits the collected data to the management module, which controls the use of energy; Management module: used to manage and schedule energy usage.

6. The pluggable three-phase smart energy meter according to claim 5, characterized in that: The specific operation process of the phase recognition module is as follows: S1: The concentrator device installed under the transformer is connected to the three-phase power of A, B, C, and N on the smart meter body (1), and collects the zero-crossing signals of A and N; S2: The centralized acquisition device periodically sends a phase identification signal. When sending a phase detection signal, the concentrator only sends a very short information frame when the A phase crosses the zero point; S3: The smart meter (1) collects the time of the zero-crossing signal of the phase where the smart meter (1) is located through the MCU unit, and then compares it with the time of the received concentrator signal to calculate the zero-crossing time of the phase where the smart meter (1) is located and the data packet reception time difference; S4: By repeatedly calculating and comparing the time differences of the various phases of the concentrator, the phase of the smart meter body (1) is determined.

7. The pluggable three-phase smart energy meter according to claim 6, characterized in that: The sampling module is provided with a plurality of registers.

8. The pluggable three-phase smart electric energy meter according to claim 7, characterized in that: The transmission module establishes a communication connection with the management module.

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