Modularized connector for electric energy meter verification

Abstract

The utility model discloses a modularized connector for electric energy meter verification, and relates to the technical field of electric energy meter verification. The modular connector for electric energy meter verification comprises an upper adapter and a lower adapter mounted at the lower end of the upper adapter through screws. An auxiliary needle seat capable of being detached in a sliding mode is arranged between the two oppositely-arranged side columns on the upper adapter seat, and the auxiliary needle seat is fixed to the bottoms of the opposite faces of the two side columns of the upper adapter seat through a limiting assembly. By arranging a limiting pin, a first limiting connecting hole and a second limiting connecting hole in the limiting assembly, the first limiting connecting hole and the second limiting connecting hole are fixed through the limiting pin; when the current needle copper column, the auxiliary copper column and the voltage needle copper column on the auxiliary needle seat are driven to be plugged, the auxiliary needle seat is driven to move upwards, and subsequent electric energy meter verification is affected.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter calibration technology, and in particular to a modular connector for electricity meter calibration. Background Technology

[0002] Modular connectors for electricity meter verification are connection devices specifically designed for the electricity meter verification process. They enable convenient and stable connection between electricity meters of different specifications and from different manufacturers and the verification device.

[0003] To improve the compatibility of connectors used for electricity meter calibration, a detachable and replaceable design is often adopted at the contact end with the electricity meter. Chinese utility model patent "CN207764370U" discloses an EMC testing meter conversion plug-in device. Currently, there is a lack of a suitable conversion device for fully automated EMC calibration lines for electricity meters. The device includes a meter holder, which includes an adapter base for inserting the electricity meter onto its inner wall. This adapter base has an auxiliary pin seat with multiple current and voltage pins located at the front. The rear of the adapter base has a heavy-duty connector plug, which connects to the current and voltage pins via wires.

[0004] The above technical solution enables rapid connection and disconnection between the testing device and the electricity meter, and achieves compatibility between single-phase and three-phase electricity meters in the same calibration production line, facilitating EMC automatic communication testing. However, because it is used on a production line, the electricity meters need to be constantly replaced and calibrated. During meter replacement, repeated plugging and unplugging are required. Due to the friction between the electricity meter and the calibration copper post during these plugging and unplugging operations, the electricity meter can easily cause the calibration copper post to move, affecting subsequent calibration work. Therefore, a modular connector for electricity meter calibration is urgently needed to solve this problem. Utility Model Content

[0005] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a modular connector for the calibration of electricity meters. When the electricity meter is plugged in and out, there is a certain friction between the electricity meter and the calibration copper post. Therefore, when the electricity meter is plugged in and out repeatedly for calibration, the electricity meter can easily cause the calibration copper post to move, affecting the subsequent calibration work.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a modular connector for electricity meter calibration, comprising an upper adapter and a lower adapter mounted on the lower end of the upper adapter by screws;

[0007] An auxiliary needle holder is provided between two opposing side posts on the upper adapter. The auxiliary needle holder is fixed to the bottom of the opposing surfaces of the two side posts of the upper adapter by a limiting component; forming a modular component improves the efficiency of electricity meter calibration.

[0008] Guide limiting blocks are welded to both the left and right sides of the auxiliary needle holder, and the bottom of both guide limiting blocks is flush with the auxiliary needle holder.

[0009] The limiting component includes a second limiting connection hole formed at the bottom of the two side pillars of the upper adapter and perpendicular to the sliding direction of the auxiliary pin seat between the side pillars of the upper adapter; a first limiting connection hole formed on the guide limiting block and corresponding to the second limiting connection hole; and a limiting pin for fixing the first limiting connection hole and the second limiting connection hole together.

[0010] Preferably, there is an upper adapter and a lower adapter mounted on the lower end of the upper adapter by screws;

[0011] An auxiliary needle holder is provided between two opposing side posts on the upper adapter seat. The auxiliary needle holder is fixed to the bottom of the opposite surfaces of the two side posts of the upper adapter seat by a limiting component.

[0012] Guide limiting blocks are welded to both the left and right sides of the auxiliary needle holder, and the bottom of both guide limiting blocks is flush with the auxiliary needle holder.

[0013] The limiting component includes a second limiting connection hole formed at the bottom of the two side pillars of the upper adapter and perpendicular to the sliding direction of the auxiliary pin seat between the side pillars of the upper adapter; a first limiting connection hole formed on the guide limiting block and corresponding to the second limiting connection hole; and a limiting pin for fixing the first limiting connection hole and the second limiting connection hole together.

[0014] Preferably, the limiting pin, the baffle, the first limiting connecting hole, the second limiting connecting hole, and the groove are all cross-shaped.

[0015] Preferably, one end of each of the two limiting pins is welded with a baffle of the same size as the groove, and the other end of each limiting pin is rotatably provided with a locking pin. The locking pin is larger than the limiting pin in the vertical state, but smaller than the limiting pin in the rotating state. The limiting pin, the first limiting connecting hole, and the second limiting connecting hole are of the same size and shape.

[0016] Preferably, the two side columns of the upper adapter are provided with guide grooves on their opposite surfaces for guiding the guide limiting block to slide.

[0017] Preferably, the lower ends of the two side columns of the upper adapter are provided with engagement grooves, and the upper end of the lower adapter is welded with a locking block at the position where it overlaps with the engagement groove, and the two locking blocks are respectively locked inside the corresponding engagement grooves.

[0018] Preferably, the front end of the auxiliary needle holder has a notch, three current needle copper pillars are installed on the left side of the upper end of the auxiliary needle holder, seven voltage needle copper pillars are installed on the right side of the upper end of the auxiliary needle holder, and two auxiliary copper pillars are installed between the current needle copper pillars and the voltage needle copper pillars and on the upper end of the auxiliary needle holder.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This modular connector for electricity meter calibration, by setting the limiting pin, the first limiting connection hole and the second limiting connection hole in the limiting component, fixes the first limiting connection hole and the second limiting connection hole by the limiting pin, thereby avoiding the situation where the auxiliary pin seat moves upward when the current pin, the auxiliary pin and the voltage pin on the auxiliary pin seat are moved in and out, thus affecting the subsequent electricity meter calibration, thereby improving the stability of the modular connector when performing batch electricity meter testing.

[0021] 2. This modular connector for energy meter calibration allows for the replacement of the auxiliary pin seat by making it detachable from the two side posts of the upper adapter. This enables the use of different models of energy meters for calibration and testing, thereby increasing the range of energy meter models that the connector can be compatible with, thus expanding the applicability of the connector.

[0022] 3. This modular connector for energy meter calibration, by setting the locking pin and the baffle, can restrict the movement of the limiting pin inside the first limiting connection hole and the second limiting connection hole. This avoids the problem that the limiting pin is not stable enough in restricting the first limiting connection hole and the second limiting connection hole due to the tendency of the energy meter to drive the auxiliary pin seat to move when inserting and removing the energy meter for calibration. In other words, it improves the stability of the connection between the limiting pin and the first limiting connection hole and the second limiting connection hole. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2This is a schematic diagram of the overall back of the present invention;

[0026] Figure 3 This is a schematic diagram of the upper and lower adapter seats of this utility model;

[0027] Figure 4 This is a schematic diagram of the back of the upper and lower adapter seats of this utility model;

[0028] Figure 5 This is a schematic diagram of the limiting pin of this utility model;

[0029] Figure 6 This is a schematic diagram of the overall auxiliary needle holder of this utility model;

[0030] Figure 7 This utility model Figure 3 Enlarged view of point A in the middle;

[0031] Figure 8 This utility model Figure 4 Enlarged diagram of point B in the middle.

[0032] Reference numerals in the attached diagram: 1. Upper adapter; 2. Lower adapter; 3. Locking pin; 4. Limiting pin; 5. Baffle; 6. Current needle copper post; 7. Auxiliary copper post; 8. Notch; 9. Voltage needle copper post; 10. Auxiliary needle seat; 11. Guide limiting block; 12. First limiting connection hole; 13. Second limiting connection hole; 14. Groove; 15. Locking block; 16. Engaging groove; 17. Guide groove. Detailed Implementation

[0033] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0034] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art should reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0037] Please see Figure 1-8 This utility model provides a technical solution: a modular connector for calibrating an electricity meter, comprising: an upper adapter 1 and a lower adapter 2 mounted on the lower end of the upper adapter 1 by screws;

[0038] An auxiliary needle holder 10 is provided between two opposing side posts on the upper adapter 1. The auxiliary needle holder 10 is fixed to the bottom of the opposite surfaces of the two side posts of the upper adapter 1 by a limiting component.

[0039] Guide limiting blocks 11 are welded to both the left and right sides of the auxiliary needle holder 10, and the bottom of both guide limiting blocks 11 is flush with the auxiliary needle holder 10.

[0040] The limiting component includes a second limiting connection hole 13 formed at the bottom of the two side pillars of the upper adapter 1 and perpendicular to the sliding direction of the auxiliary pin seat 10 along the side pillars of the upper adapter 1; a first limiting connection hole 12 formed on the guide limiting block 11 and corresponding to the second limiting connection hole 13; and a limiting pin 4 for fixing the first limiting connection hole 12 and the second limiting connection hole 13 together.

[0041] By setting the limiting pin 4, the first limiting connection hole 12, and the second limiting connection hole 13 in the limiting component, the first limiting connection hole 12 and the second limiting connection hole 13 are fixed by the limiting pin 4. This avoids the situation where the auxiliary pin holder 10 moves upward when the current pin copper post 6, the auxiliary copper post 7, and the voltage pin copper post 9 on the auxiliary pin holder 10 are driven to be inserted or removed, which would affect the subsequent energy meter verification. In other words, the stability of the modular connector is improved when performing batch energy meter testing.

[0042] This utility model achieves the insertion and installation of the electricity meter terminals through the design of an upper adapter 1 and a lower adapter 2. The upper adapter 1 is designed to be mounted on the main structure above it, and typically includes screw holes for fixing with screws. The lower adapter 2 is designed to connect to the electricity meter or testing equipment, and typically includes a corresponding connection interface. An auxiliary pin holder 10 is designed to facilitate the installation and removal of the test pin. Guide limiting blocks 11 are welded to both sides of the auxiliary pin holder 10 to ensure proper guidance of the test pin during insertion and removal. Second limiting connection holes 13 are formed at the bottom of the two side pillars of the upper adapter 1, and these holes should be perpendicular to the sliding direction of the auxiliary pin holder. First limiting connection holes 12, corresponding to the second limiting connection holes 13, are formed on the guide limiting blocks 11. Limiting pins 4 are used to fix the first limiting connection holes 12 and the second limiting connection holes 13 together. When implementing a modular connection, the limiting pins 4 are inserted into the first limiting connection holes 12 and the second limiting connection holes 13 to ensure they are fixed together. The auxiliary pin holder 10 is fixed to the bottom of the upper adapter 1 by the guide limiting block 11. The current pin copper post 6, auxiliary copper post 7, and voltage pin copper post 9 are inserted into the corresponding holes of the auxiliary pin holder 10. When the test pins are inserted or removed, the auxiliary pin holder 10 will not move upwards due to the limiting component, thus ensuring the stability of the connector. During batch testing of energy meters, this design ensures stability during each insertion and removal operation, avoiding any impact on the accuracy of the calibration process due to movement of the auxiliary pin holder. The guide limiting block 11 is designed to ensure its bottom is flush with the auxiliary pin holder 10 so that the limiting pin 4 can be smoothly inserted into the hole. The length and diameter of the limiting pin 4 should be appropriate to ensure that it can both secure the connection hole and not be too loose or difficult to insert. Through the above design and assembly steps, stability is achieved during batch testing of energy meters, ensuring the accuracy and efficiency of the testing process.

[0043] Grooves 14 are formed on the upper adapter 1 along the radial extension direction of the two second limiting connection holes 13. The grooves 14 are larger than the second limiting connection holes 13. The second limiting connection holes 13 on the upper adapter 1 are improved by forming grooves 14 in their radial extension direction to increase the stability and functionality of the limiting assembly. When designing the grooves 14, the grooves are first positioned. First, in the design of the upper adapter 1, the radial extension direction of the second limiting connection holes 13 is determined, and the position of the grooves 14 is planned in this direction. The size of the grooves 14 is ensured to be larger than the second limiting connection holes 13 so that the limiting pin 4 can slide freely in the groove, but not so large as to affect stability. A suitable material is selected to machine the grooves 14, usually the same material as the upper adapter 1, to ensure consistency and durability. The grooves 14 are machined on the upper adapter 1 using appropriate machining tools and equipment (such as a lathe, milling machine, or laser cutting machine). The limiting pin 4 is inserted into the second limiting connection holes 13, ensuring that it can pass through the holes and engage with the grooves 14. Use appropriate tools (such as a wrench or screwdriver) to secure the limiting pin 4 in the groove 14, ensuring it does not loosen. During positioning, when the auxiliary pin seat 10 is inserted or removed, the limiting pin 4 interacts with the second limiting connection hole 13 through the groove 14. Due to the presence of the groove 14, the sliding of the limiting pin 4 within the groove is restricted, thus limiting the upward movement of the auxiliary pin seat 10. This design makes the fixing of the limiting pin 4 in the groove more stable, reducing the movement of the auxiliary pin seat 10 caused by insertion and removal operations, thereby improving the overall stability of the connector.

[0044] Through this process, the design of groove 14 not only increases the fixing point of limit pin 4, but also provides additional sliding restriction, thereby improving the stability and reliability of the modular connector in the energy meter calibration process.

[0045] The limiting pin 4, the baffle 5, the first limiting connecting hole 12, the second limiting connecting hole 13, and the groove 14 are all cross-shaped. A baffle 5 of the same size as the groove 14 is welded to one end of each of the two limiting pins 4. Meanwhile, a locking pin 3 is rotatably mounted on the other end of each limiting pin 4. The locking pin 3 is larger than the limiting pin 4 in its vertical state, but smaller than the limiting pin 4 in its rotating state. The limiting pin 4, the first limiting connecting hole 12, and the second limiting connecting hole 13 are of the same size and shape.

[0046] A modular connector for calibrating an electricity meter includes: an upper adapter 1, a lower adapter 2 mounted on the lower end of the upper adapter 1 by screws, and an intelligent detection and adaptive adjustment module;

[0047] The intelligent detection and adaptive adjustment module includes a pressure sensor, a displacement sensor, a control chip, and a miniature electric push rod installed inside the upper adapter.

[0048] The pressure sensor is installed on the contact surface between the auxiliary needle seat 10 and the side column of the upper adapter seat 1, and is used to detect the pressure on the auxiliary needle seat 10 in real time; the displacement sensor 6 is installed at the end of the auxiliary needle seat 10, and is used to monitor the displacement of the auxiliary needle seat 10 during the sliding process; the control chip 7 is electrically connected to the pressure sensor, the displacement sensor and the miniature electric push rod.

[0049] One end of the miniature electric actuator is fixed to the side post of the upper adapter 1, and the other end is connected to the auxiliary needle holder 10. The control chip can control the extension and retraction of the miniature electric actuator based on data feedback from the pressure sensor and displacement sensor, so as to adaptively adjust the position and pressure of the auxiliary needle holder, ensuring the stability and compatibility of the connection during the energy meter calibration process. This integration of intelligent detection and adaptive adjustment modules enables the modular connector for energy meter calibration to maintain optimal condition during dynamic connection, improving calibration efficiency and accuracy.

[0050] The two side posts of the upper adapter 1 are each provided with a guide groove 17 for guiding the sliding of the guide limiting block 11. The lower ends of the two side posts of the upper adapter 1 are each provided with a locking groove 16. A locking block 15 is welded to the upper end of the lower adapter 2 at the position where it overlaps with the locking groove 16, and the two locking blocks 15 are respectively locked inside the corresponding locking groove 16. The front end of the auxiliary needle seat 10 is provided with a notch 8. Three current needle copper pillars 6 are installed on the left side of the upper end of the auxiliary needle seat 10, and seven voltage needle copper pillars 9 are installed on the right side of the upper end of the auxiliary needle seat 10. Two auxiliary copper pillars 7 are installed between the current needle copper pillars 6 and the voltage needle copper pillars 9 and on the upper end of the auxiliary needle seat 10.

[0051] When it is necessary to disassemble and replace the auxiliary needle holder 10;

[0052] First, an external force is used to rotate the SIM card pin 3 to a position smaller than the limiting pin 4. Then, the external force moves the limiting pin 4, located on one side of the SIM card pin 3, towards the baffle 5. The movement of the limiting pin 4 causes the baffle 5 to move a certain distance. Finally, the user uses external force to move the baffle 5, causing the limiting pin 4 to completely disengage from the second limiting connection hole 13. The SIM card pin 3 is fixed in a position larger than the diameter of the limiting pin 4. The limiting pin 4 is inserted into the second limiting connection hole 13, preventing the SIM card pin 3 from rotating. The baffle 5 is located near the limiting pin 4, preventing it from moving further towards the baffle 5. An external force (such as hand-twisting or a mechanical device) is used to rotate the SIM card pin 3. Because the size of the SIM card pin 3 is larger than the position of the limiting pin 4, the rotation of the SIM card pin 3 is not immediately restricted by the limiting pin 4. When the limiting pin 4 moves toward the baffle 5, and the locking pin 3 rotates to a certain extent, becoming smaller than the position of the limiting pin 4, the external force continues to act on the limiting pin 4. Under the action of the external force, the limiting pin 4 begins to move toward the baffle 5. The movement of the limiting pin 4 drives the baffle 5 to move, and one end of the baffle 5 moves accordingly. The movement of the baffle 5 is achieved through a connecting rod, gear, or other mechanical transmission mechanism. As one end of the baffle 5 moves, the limiting pin 4 is pushed toward the outside of the second limiting connection hole 13. When one end of the limiting pin 4 is far enough away from the baffle 5, the limiting pin 4 has completely disengaged from the inside of the second limiting connection hole 13.

[0053] The user continues to move the baffle 5 using external force (such as manual pulling or a mechanical device) to ensure that the limiting pin 4 is completely disengaged from the second limiting connection hole 13. Once the limiting pin 4 is fully released, the chuck 3 rotates freely and is no longer restricted by the limiting pin 4. This working process demonstrates how the mechanical locking state of the chuck 3 and the limiting pin 4 can be gradually released by the action of external force, thereby allowing the free rotation of the chuck 3 and the movement of the limiting pin 4. This mechanism is commonly used in mechanical structures that require periodic disassembly or maintenance to ensure ease of operation and safety. Next, the notch 8 is moved by external force, and the movement of the notch 8 causes the auxiliary pin seat 10 to move until it is completely disengaged from the two side posts of the upper adapter seat 1.

[0054] Finally, an external force drives the new auxiliary needle seat 10 to move. The movement of the auxiliary needle seat 10 drives the two guide limiting blocks 11 to move. The guide limiting blocks 11 move along the guide groove 17. The movement of the guide limiting blocks 11 drives the first limiting connecting hole 12 to move until it coincides with the second limiting connecting hole 13. Then, an external force drives the limiting pin 4 to move. The movement of the limiting pin 4 drives the baffle 5 to move until it coincides with the corresponding groove 14. Subsequently, an external force drives the locking pin 3 to rotate to a vertical state, so that the locking pin 3 contacts the upper adapter seat 1.

[0055] By allowing the auxiliary pin holder 10 to be detached from the two side posts of the upper adapter 1, the auxiliary pin holder 10 can be replaced, thereby enabling the use of different models of electricity meters for calibration and testing. This improves the range of electricity meter models that the connector can be compatible with, thus expanding the applicability of the connector.

[0056] By setting the jacking pin 3 and the baffle 5, the jacking pin 3 and the baffle 5 can restrict the movement of the limiting pin 4 inside the first limiting connection hole 12 and the second limiting connection hole 13. This avoids the problem that the limiting pin 4 is not stable enough in restricting the first limiting connection hole 12 and the second limiting connection hole 13 due to the tendency of the energy meter to move the auxiliary pin seat 10 when inserting and unplugging the energy meter. In other words, it improves the stability of the connection between the limiting pin 4 and the first limiting connection hole 12 and the second limiting connection hole 13.

[0057] In further operation, when the auxiliary needle holder 10 needs to be disassembled and replaced, the following steps are taken: First, an external force is used to rotate the locking pin 3 to a position smaller than the limiting pin 4. Then, an external force is used to move the limiting pin 4, located on one side of the locking pin 3, toward the baffle 5. The movement of the limiting pin 4 causes the baffle 5 to move a certain distance. Then, the user uses an external force to move the baffle 5, thereby causing the limiting pin 4 to completely disengage from the interior of the second limiting connection hole 13. Next, an external force is used to move the notch 8. The movement of the notch 8 causes the auxiliary needle holder 10 to move completely away from the two side posts of the upper adapter 1. Finally, an external force drives the new auxiliary needle seat 10 to move. The movement of the auxiliary needle seat 10 drives the two guide limiting blocks 11 to move. The guide limiting blocks 11 move along the guide groove 17. The movement of the guide limiting blocks 11 drives the first limiting connecting hole 12 to move until it coincides with the second limiting connecting hole 13. Then, an external force drives the limiting pin 4 to move. The movement of the limiting pin 4 drives the baffle 5 to move until it coincides with the corresponding groove 14. Subsequently, an external force drives the locking pin 3 to rotate to a vertical state, so that the locking pin 3 contacts the upper adapter seat 1.

[0058] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A modular connector for calibrating an electricity meter, characterized in that: include: Upper adapter (1) and lower adapter (2) mounted on the lower end of the upper adapter (1) by screws; An auxiliary needle seat (10) is provided between two opposing side pillars on the upper adapter (1). The auxiliary needle seat (10) is fixed to the bottom of the opposite surfaces of the two side pillars of the upper adapter (1) by a limiting component. Guide limiting blocks (11) are welded to both the left and right sides of the auxiliary needle seat (10), and the bottom of the two guide limiting blocks (11) are flush with the auxiliary needle seat (10). The limiting component includes a second limiting connection hole (13) opened at the bottom of the two side pillars of the upper adapter (1) and perpendicular to the sliding direction of the auxiliary needle seat (10) along the side pillars of the upper adapter (1), a first limiting connection hole (12) opened on the guide limiting block (11) and corresponding to the second limiting connection hole (13), and a limiting pin (4) for fixing the first limiting connection hole (12) and the second limiting connection hole (13) together.

2. The modular connector for verifying an electricity meter according to claim 1, characterized in that: The two second limiting connection holes (13) have grooves (14) on the upper adapter (1) along their radial extension direction. The grooves (14) are larger than the second limiting connection holes (13). One end of each of the two limiting pins (4) is welded with a baffle (5) of the same size as the groove (14), and the other end of the limiting pin (4) is rotatably provided with a jack (3).

3. A modular connector for energy meter calibration according to claim 2, characterized in that: The limiting pin (4), the baffle (5), the first limiting connection hole (12), the second limiting connection hole (13), and the groove (14) are all cross-shaped.

4. A modular connector for calibrating an electricity meter according to claim 3, characterized in that: The size of the pin (3) is larger than that of the limiting pin (4) when it is vertical, while the size of the pin (3) is smaller than that of the limiting pin (4) when it is rotating. The limiting pin (4), the first limiting connection hole (12) and the second limiting connection hole (13) have the same size and shape.

5. A modular connector for verifying an electricity meter according to claim 1, characterized in that: The two side columns of the upper adapter (1) are provided with guide grooves (17) for guiding the sliding of the guide limit block (11).

6. The modular connector for testing an electricity meter according to claim 1, characterized in that: The lower ends of the two side columns of the upper adapter (1) are provided with engagement grooves (16), and the upper end of the lower adapter (2) is welded with a locking block (15) at the position where it overlaps with the engagement groove (16). The two locking blocks (15) are respectively locked inside the corresponding engagement groove (16).

7. A modular connector for verifying an electricity meter according to claim 1, characterized in that: The auxiliary needle holder (10) has a notch (8) at its front end. Three current needle copper pillars (6) are installed on the left side of the upper end of the auxiliary needle holder (10). Seven voltage needle copper pillars (9) are installed on the right side of the upper end of the auxiliary needle holder (10). There are two auxiliary copper pillars (7) between the current needle copper pillars (6) and the voltage needle copper pillars (9) and installed on the upper end of the auxiliary needle holder (10).

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