Single-phase cost control intelligent electric meter

Abstract

The application relates to the technical field of electric meters, and discloses a single-phase cost control intelligent electric meter, which comprises an electric meter body, mounting grooves, four corners respectively arranged in the interior of the electric meter body, a display screen internally arranged at the top end of one side of the electric meter body, a fixing structure arranged at one side of a wiring terminal, an early warning structure arranged at the other side of the wiring terminal, and a sealing structure arranged at the bottom end of a first moving plate. The driving motor drives the worm and the worm gear to drive the screw rod to rotate, and then the moving block drives the first moving plate to slide, so that the rubber pad presses and fixes the wire on the surface of the wiring terminal, thereby realizing the automatic locking function of the device, the wiring fixing can be completed without relying on tools, the installation and maintenance efficiency is improved, the problem of uneven artificial fastening force is avoided, the stability of the wire connection is ensured, and the risk of heating or measurement error caused by poor contact is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of electricity meters, and more specifically, it relates to a single-phase prepaid smart meter. Background Technology

[0002] With the advancement of smart grid construction, single-phase prepaid smart meters have emerged. Based on microelectronics, communication technology, and metering algorithms, they replace traditional mechanical meters. They integrate accurate metering, prepaid management, and data interaction functions. Through electronic modules, they measure electricity consumption in real time, support IC cards or remote top-ups, and automatically issue warnings or cut off power when the balance is insufficient, realizing "pay first, use later." At the same time, they use communication interfaces to upload data, assisting power departments in remote meter reading and electricity monitoring. This not only improves metering accuracy and management efficiency but also makes it convenient for users to understand their electricity consumption. They are key terminal devices in the smart electricity system.

[0003] Existing technologies, such as patent document with publication number CN207424065U, disclose a single-phase electronic prepaid smart energy meter that is easy to install, relating to the field of energy meter technology. This easy-to-install single-phase electronic prepaid smart energy meter includes a front panel and a rear cover. The front panel has a display screen, a rotary display button, and a programming button on its front surface. This easy-to-install single-phase electronic prepaid smart energy meter, through the cooperation of a rear cover plate, groove, rotating base, rotating rod, fixing ring, fixing rod, suspension device, hook, telescopic frame, sliding plate, telescopic spring, locking rod, locking base, and adjusting block, allows the hook on the rear cover plate of the energy meter to be hung on a mounting plate or other mounting medium compatible with the single-phase electronic prepaid smart energy meter. Simultaneously, the locking rod provides fixation and limiting, thus enabling the installation of the energy meter. This installation method is simple and convenient, facilitating meter maintenance by power workers. However, existing single-phase prepaid smart meters still have the following drawbacks:

[0004] 1. In the existing technology, the bolt tightening method requires each terminal to be tightened one by one. When connecting multiple sets of wires, the steps are repeated and time-consuming, resulting in low efficiency in installing or replacing wires. Moreover, the operation relies on special tools such as screwdrivers. If the tools are missing or the specifications are not compatible, the wiring cannot be completed in time, affecting the normal installation and maintenance of the meter. At the same time, the tightening force of the bolts is entirely controlled by manual experience. If the force is too small, it is easy to cause poor wire contact and cause overheating. If the force is too large, it may cause the bolt to strip or the terminal to deform, resulting in a decrease in wiring reliability and an increase in the probability of subsequent failures.

[0005] 2. In the existing technology, the wiring port of the electricity meter is usually only covered by a simple cover plate, with large gaps and insufficient sealing, which makes it easy for external foreign objects such as insects, dust and moisture to enter the interior. The accumulation of insect corpses or dust at the wiring terminal will reduce the conductivity and cause problems such as poor contact and local overheating.

[0006] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a single-phase prepaid smart meter in order to achieve a more practical value. Summary of the Invention

[0007] This invention provides a single-phase prepaid smart meter to overcome the aforementioned defects in the prior art.

[0008] The purpose and effectiveness of this invention, a single-phase prepaid smart meter, are achieved through the following specific technical means:

[0009] A single-phase prepaid smart meter includes a meter body.

[0010] The mounting slots are respectively opened at the four corners inside the meter body. A display screen is installed inside the top of one side of the meter body. A nameplate cover is rotatably connected inside the other side of the meter body. An anti-theft bolt that is threadedly connected to the meter body is inserted inside the other side of the nameplate cover.

[0011] The protective cover is rotatably connected to the bottom of one side of the meter body;

[0012] The wiring port is located inside the bottom of the meter body, and a wiring terminal is installed at the top of the inside of the wiring port.

[0013] A fixed structure is provided on one side of the wiring terminal. The fixed structure includes a first movable plate that is slidably connected to the bottom of the inside of the meter body. A screw sleeve seat is fixed on one side of the first movable plate. An adjusting bolt is threadedly connected to the inside of the screw sleeve seat. A pressure plate that is slidably connected to the meter body is rotatably connected to one side of the adjusting bolt. A rubber pad is fixed on one side of the pressure plate. A drive assembly is provided at the top of the first movable plate.

[0014] An early warning structure is located on the other side of the wiring terminal to provide an early warning of loose wiring terminals;

[0015] A sealing structure is located at the bottom of the first movable plate to seal the connection port in conjunction with the fixed structure.

[0016] A further technical solution: The drive assembly includes a movable block fixed to the top of the first movable plate. The movable block is internally threaded with a lead screw that is rotatably connected to the meter body. A worm gear is fixed to one side of the lead screw, and a worm gear that is rotatably connected to the meter body is connected to one side of the worm gear. A drive motor is installed at the bottom of the meter body.

[0017] A further technical solution: The sealing structure includes a gear rotatably connected to the bottom end of the first movable plate, the top end of the gear meshing with a fixed rack fixedly connected to the meter body, the bottom end of the gear meshing with a movable rack slidably connected to the meter body, the bottom end of the movable rack being fixed to a second movable plate, a buffer spring being fixed inside one side of the second movable plate, a pusher being fixed to one side of the buffer spring, and a silicone block being fixed to one side of the pusher.

[0018] Further technical solution: The warning structure includes a movable groove inside the meter body and connected to the wiring port. A ceramic insulating block that is fixedly connected to the wiring terminal is slidably connected inside the movable groove. A reset spring is fixed on one side of the ceramic insulating block. A pressure sensor that is in contact with the ceramic insulating block is installed on one side inside the movable groove.

[0019] A further technical solution: the adjusting bolt passes through the first movable plate and extends to the outside of the meter body, and the pressure plate and the wiring terminal are located on the same horizontal center line.

[0020] A further technical solution: The outer wall of the lead screw is provided with an external thread, and the inside of the moving block is provided with an internal thread that cooperates with the external thread.

[0021] A further technical solution: The output shaft end of the drive motor is connected to the rotating end of the worm, and the worm and the worm wheel form a meshing connection.

[0022] A further technical solution: the fixed rack and the movable rack are centrally symmetrically distributed on the axis of the gear.

[0023] A further technical solution: The gears are provided in two sets, and the two sets of gears are symmetrically distributed on the vertical center line of the second moving plate.

[0024] A further technical solution: the ceramic insulating block and the moving groove form a sliding connection in the horizontal direction, and the ceramic insulating block and the moving groove form a telescopic structure through a return spring.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention discloses a single-phase prepaid smart meter. A drive motor, via a worm gear and worm wheel, rotates a lead screw. A moving block then slides a first moving plate, causing a rubber pad to press and fix the wires to the terminal surface. This achieves an automatic locking function, allowing for tool-free wiring fixation and improving installation and maintenance efficiency. It also avoids uneven tightening force caused by manual tightening, ensuring the stability of the wire connection and reducing the risk of overheating or metering errors due to poor contact.

[0027] The present invention discloses a single-phase prepaid smart meter that detects a pressure drop through a pressure sensor and feeds the signal back to the controller. The controller then sends a remote warning through the communication module. The controller also controls the fixed structure to increase the pressure between the wire and the terminal block, thereby realizing the loosening warning function of the device. It can detect the problem in the early stage of wire loosening and provide remote feedback in time, which facilitates the rapid response of the staff. At the same time, it automatically adjusts the pressure to maintain the connection stability, avoids power outages or metering abnormalities caused by loosening, and reduces the frequency and cost of manual inspection.

[0028] This invention discloses a single-phase prepaid smart meter. Through the cooperation of gears, a fixed rack, and a movable rack, a second movable plate is driven to slide, allowing a silicone block to contact the wires before the rubber pad, filling the gap between the wires and the connection port. This achieves the connection port sealing function of the device, effectively preventing the intrusion of foreign objects such as dust and insects. The sealing and fixing actions work together without additional operation steps, simplifying the process and reducing the probability of poor contact or short circuit caused by foreign objects. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 In this invention Figure 1 Another structural diagram from a different angle;

[0031] Figure 3 This is a three-dimensional cross-sectional structural diagram of the meter connection port of the present invention;

[0032] Figure 4 For the present invention Figure 3 Another structural diagram from a different angle;

[0033] Figure 5 This is the invention Figure 4 Enlarged cross-sectional view of point A in the middle section;

[0034] Figure 6 This is a three-dimensional structural diagram of the fixed structure of the present invention;

[0035] Figure 7 This is a three-dimensional structural diagram of the first movable plate of the present invention;

[0036] Figure 8 This is a three-dimensional cross-sectional structural diagram of the sealing structure of the present invention;

[0037] Figure 9 This is a system block diagram of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Meter body; 2. Display screen; 3. Nameplate cover; 4. Anti-theft bolt; 5. Protective cover; 6. Fixing structure; 601. Adjusting bolt; 602. Screw sleeve seat; 603. First moving plate; 604. Pressure plate; 605. Rubber pad; 606. Moving block; 607. Lead screw; 608. Worm gear; 609. Worm; 610. Drive motor; 7. Sealing structure; 701. Second moving plate; 702. Push frame; 703. Silicone block; 704. Gear; 705. Fixed rack; 706. Moving rack; 707. Buffer spring; 8. Wiring port; 9. Warning structure; 901. Ceramic insulating block; 902. Return spring; 903. Moving groove; 904. Pressure sensor; 10. Mounting groove; 11. Wiring terminal. Detailed Implementation

[0040] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0041] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] As attached Figure 1 To be continued Figure 9As shown: This invention provides a single-phase prepaid smart meter, including a meter body 1,

[0044] Mounting slots 10 are respectively opened at the four corners inside the meter body 1. A display screen 2 is installed inside the top of one side of the meter body 1. A nameplate cover 3 is rotatably connected inside one side of the meter body 1. An anti-theft bolt 4 that is threadedly connected to the meter body 1 is inserted inside one side of the nameplate cover 3.

[0045] Protective cover 5 is rotatably connected to the bottom end of one side of the meter body 1;

[0046] The wiring port 8 is located inside the bottom of the meter body 1, and the top of the wiring port 8 is equipped with a wiring terminal 11.

[0047] A fixing structure 6 is provided on one side of the terminal block 11. The fixing structure 6 includes a first movable plate 603 that is slidably connected to the bottom of the inside of the meter body 1. A screw sleeve seat 602 is fixed on one side of the first movable plate 603. An adjusting bolt 601 is threadedly connected inside the screw sleeve seat 602. A pressure plate 604 that is slidably connected to the meter body 1 is rotatably connected on one side of the adjusting bolt 601. A rubber pad 605 is fixed on one side of the pressure plate 604. A driving assembly is provided at the top of the first movable plate 603.

[0048] The warning structure 9 is located on the other side of the terminal block 11 and is used to provide a warning for loose terminal block 11.

[0049] The sealing structure 7 is located at the bottom end of the first movable plate 603 and is used to seal the connection port 8 in conjunction with the fixed structure 6.

[0050] In this embodiment, the mounting slot 10 is used for the fixed installation of the meter body 1. The display screen 2 displays information such as electricity consumption and remaining amount in real time. The nameplate cover 3 is fixed to the meter body 1 by the anti-theft bolt 4 to prevent unauthorized opening. The external power supply wire is inserted into the wiring port 8 so that the wire contacts the wiring terminal 11. The control fixing structure 6 presses and fixes the wire to the surface of the wiring terminal 11, connecting the meter body 1 to the circuit. At the same time, when the wire is loose, the pressure on the warning structure 9 changes and feeds the signal back to the controller of the meter body 1. The controller remotely warns the wire through the communication module. At the same time, the controller controls the operation of the fixing structure 6 to increase the pressure between the wiring terminal 11 and the wire.

[0051] like Figures 6 to 7As shown: The drive assembly includes a moving block 606 fixed to the top of the first moving plate 603. The moving block 606 is internally threaded with a lead screw 607 that is rotatably connected to the meter body 1. A worm gear 608 is fixed to one side of the lead screw 607. A worm 609 that is rotatably connected to the meter body 1 is connected to one side of the worm gear 608. A drive motor 610 is installed at the bottom of the meter body 1.

[0052] In this embodiment, the drive motor 610 drives the lead screw 607 to rotate via the worm 609 and worm wheel 608. Then, the moving block 606 drives the first moving plate 603 to slide, so that the rubber pad 605 presses and fixes the wire to the surface of the terminal 11, which to a certain extent ensures good contact between the wire and the terminal 11.

[0053] like Figures 6 to 8 As shown: The sealing structure 7 includes a gear 704 rotatably connected to the bottom end of the first moving plate 603. The top end of the gear 704 is meshed with a fixed rack 705 fixedly connected to the meter body 1. The bottom end of the gear 704 is meshed with a moving rack 706 slidably connected to the meter body 1. The bottom end of the moving rack 706 is fixed with a second moving plate 701. A buffer spring 707 is fixed inside one side of the second moving plate 701. A pusher 702 is fixed to one side of the buffer spring 707. A silicone block 703 is fixed to one side of the pusher 702.

[0054] In this embodiment, the gear 704, in conjunction with the fixed rack 705 and the movable rack 706, drives the second movable plate 701 to slide, so that the silicone block 703 contacts the wire before the rubber pad 605, filling the gap between the wire and the connector 8.

[0055] like Figures 4 to 6 As shown: The warning structure 9 includes a movable groove 903 that is opened inside the meter body 1 and connected to the wiring port 8. A ceramic insulating block 901 that is fixedly connected to the wiring terminal 11 is slidably connected inside the movable groove 903. A return spring 902 is fixed on one side of the ceramic insulating block 901. A pressure sensor 904 that is in contact with the ceramic insulating block 901 is installed on one side inside the movable groove 903.

[0056] In this embodiment, the pressure sensor 904 detects the current pressure of the terminal 11. When the wire becomes loose, the pressure sensor 904 detects the pressure drop and feeds the signal back to the controller. The controller then sends a remote warning through the communication module and controls the fixing structure 6 to increase the pressure between the wire and the terminal 11 until the pressure returns to the predetermined value. This process can detect and correct the loose wire problem in a timely manner to a certain extent and maintain stable contact between the wire and the terminal 11.

[0057] like Figures 6 to 7As shown: the adjusting bolt 601 passes through the first moving plate 603 and extends to the outside of the meter body 1, and the pressure plate 604 and the wiring terminal 11 are located on the same horizontal center line.

[0058] In this embodiment, the adjustment bolt 601 can be easily operated from outside the meter, while ensuring that the pressure plate 604 can be accurately aligned with the wires on the terminal block 11, thus improving the accuracy of pressing and fixing.

[0059] like Figures 6 to 7 As shown: the outer wall of the lead screw 607 is provided with an external thread, and the inside of the moving block 606 is provided with an internal thread that cooperates with the external thread.

[0060] In this embodiment, when the screw 607 rotates due to the threaded engagement, the moving block 606 can move stably along the axial direction of the screw 607, thereby driving the first moving plate 603 to slide smoothly and ensuring the reliable operation of the fixed structure 6.

[0061] like Figures 6 to 7 As shown: The output shaft end of the drive motor 610 is connected to the rotating end of the worm 609, and the worm 609 and the worm wheel 608 form a meshing connection.

[0062] In this embodiment, the power of the drive motor 610 is transmitted to the lead screw 607 via the worm gear 609 and worm wheel 608. The worm gear 609 and worm wheel 608 reduce speed and increase torque to provide sufficient force for fixing the wire, and at the same time have a reverse self-locking function to prevent loosening.

[0063] like Figures 6 to 8 As shown: the fixed rack 705 and the movable rack 706 are centrally symmetrically distributed on the axis of the gear 704.

[0064] In this embodiment, the movable rack 706 is made to rotate with the gear 704 to generate a synchronous displacement opposite to the moving direction of the fixed rack 705, so as to ensure that the second movable plate 701 slides smoothly in the horizontal direction.

[0065] like Figures 6 to 8 As shown: There are two sets of gears 704, and the two sets of gears 704 are symmetrically distributed on the vertical center line of the second moving plate 701.

[0066] In this embodiment, the synchronous driving of the two sets of gears 704 can make the two ends of the second moving plate 701 evenly stressed, avoid tilting and jamming during movement, and ensure that the sealing pressure of the silicone block 703 on the wire is balanced.

[0067] like Figures 4 to 6 As shown: The ceramic insulating block 901 and the moving groove 903 form a sliding connection in the horizontal direction, and the ceramic insulating block 901 and the moving groove 903 form a telescopic structure through the return spring 902.

[0068] In this embodiment, horizontal sliding ensures accurate pressure detection, and the telescopic structure allows the ceramic insulating block 901 to reset as the wire tension changes, ensuring that the pressure sensor 904 can monitor the contact status in real time.

[0069] The specific usage method of this invention: The device is powered by a built-in battery. The meter body 1 has a built-in battery and communication module. The battery provides basic power to ensure that the core functions of each component can still be maintained when the external power grid is cut off. The communication module is used to realize data interaction and information transmission between the meter body 1 and the external system. The mounting slot 10 is used for the fixed installation of the meter body 1. The display screen 2 displays information such as electricity consumption and remaining amount in real time. The nameplate cover 3 is fixed to the meter body 1 by anti-theft bolts 4 to prevent unauthorized opening. When wiring is performed, the protective cover 5 is opened and the external power wire is inserted into the wiring port 8 so that the wire contacts the wiring terminal 11. The wire is pressed and fixed to the surface of the wiring terminal 11 by the control fixing structure 6, connecting the meter body 1 to the circuit. At the same time, when the wire is loose, the pressure on the warning structure 9 changes and feeds the signal back to the controller of the meter body 1. The controller remotely warns through the communication module. At the same time, the controller controls the operation of the fixing structure 6 to increase the pressure between the wiring terminal 11 and the wire.

[0070] When it is necessary to fix the wire, the drive motor 610 is started, and its output shaft drives the worm 609 to rotate. Then the worm 609 meshes with the worm wheel 608, thereby driving the lead screw 607 to rotate. The moving block 606 moves horizontally with the lead screw 607 because it is threadedly connected to the lead screw 607. This causes the first moving plate 603 to slide at the bottom inside the meter body 1, so that the pressure plate 604 moves closer to the terminal 11 until the rubber pad 605 contacts the wire and applies pressure, pressing and fixing the wire to the surface of the terminal 11. Through this process, the wire is stably clamped, which to a certain extent ensures good contact between the wire and the terminal 11 and reduces the possibility of poor contact. By rotating the adjusting bolt 601, the position of the pressure plate 604 can be adjusted under the action of the internal thread of the screw sleeve 602. The extension of the pressure plate 604 can be changed individually, so that the rubber pad 605 can make closer contact with the surface of wires of different specifications.

[0071] As the first movable plate 603 moves, the gear 704 moves synchronously with it. Because the gear 704 meshes with the fixed rack 705, and the fixed rack 705 is in a fixed position, the gear 704 rotates during its movement. Simultaneously, the rotation of the gear 704 drives the meshing movable rack 706 to move. Then, the movable rack 706 further drives the second movable plate 701 to slide within the meter body 1, causing the second movable plate 701 to move faster than the first movable plate 603. This results in the silicone block 703 moving faster than the rubber pad 6. 05 makes contact with the wire first, and then the pusher 702 is subjected to the reaction force of the wire, the buffer spring 707 is compressed, and at the same time the silicone block 703 deforms under pressure, thereby filling the gap between the wire and the connection port 8. During this process, the elasticity of the buffer spring 707 allows the first moving plate 603 to continue to move after the silicone block 703 contacts the wire to complete the wire fixing, which enhances the sealing of the connection port 8 to a certain extent, reduces the possibility of foreign object intrusion, and at the same time provides auxiliary fixing for the wire, making the wire less prone to loosening by external force.

[0072] When the wire is fixed, the wire exerts pressure on the ceramic insulating block 901 through the terminal 11. The ceramic insulating block 901 slides in the moving groove 903 and compresses the return spring 902, causing the pressure sensor 904 to contact the ceramic insulating block 901 to detect the current pressure. The pressure sensor 904 then feeds the signal back to the controller inside the meter body 1. When the pressure reaches the predetermined value, the controller controls the drive motor 610 to stop running, and the fixing structure 6 is fixed. When the wire becomes loose due to vibration or other reasons, the pressure of the ceramic insulating block 901 decreases, the return spring 902 pushes the ceramic insulating block 901 to reset, the pressure sensor 904 detects the pressure drop and feeds the signal back to the controller. The controller then provides a remote warning through the communication module and controls the drive motor 610 to run again, increasing the pressure between the wire and the terminal 11 through the fixing structure 6 until the pressure returns to the predetermined value. This process can detect and correct the loose wire problem in a timely manner to a certain extent, maintaining stable contact between the wire and the terminal 11. The predetermined pressure value can be remotely adjusted by the controller through the communication module.

[0073] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A single-phase prepaid smart meter, comprising a meter body (1), characterized in that: Mounting slots (10) are respectively opened at the four corners inside the meter body (1). A display screen (2) is installed inside the top of one side of the meter body (1). A nameplate cover (3) is rotatably connected inside one side of the meter body (1). An anti-theft bolt (4) that is threadedly connected to the meter body (1) is inserted inside one side of the nameplate cover (3). The protective cover (5) is rotatably connected to the bottom end of one side of the meter body (1); The wiring port (8) is located inside the bottom of the meter body (1), and the top of the wiring port (8) is equipped with a wiring terminal (11). A fixing structure (6) is provided on one side of the wiring terminal (11). The fixing structure (6) includes a first movable plate (603) slidably connected to the bottom of the inside of the meter body (1). A screw sleeve seat (602) is fixed on one side of the first movable plate (603). An adjusting bolt (601) is threadedly connected inside the screw sleeve seat (602). A pressure plate (604) slidably connected to the meter body (1) is rotatably connected on one side of the adjusting bolt (601). A rubber pad (605) is fixed on one side of the pressure plate (604). A driving component is provided at the top of the first movable plate (603). The warning structure (9) is set on the other side of the wiring terminal (11) and is used to provide a warning for loose wiring terminals (11); A sealing structure (7) is provided at the bottom end of the first movable plate (603) for sealing the connection port (8) of the fixing structure (6); The sealing structure (7) includes a gear (704) rotatably connected to the bottom end of the first movable plate (603). The top end of the gear (704) is meshed with a fixed rack (705) fixedly connected to the meter body (1). The bottom end of the gear (704) is meshed with a movable rack (706) slidably connected to the meter body (1). The bottom end of the movable rack (706) is fixed with a second movable plate (701). A buffer spring (707) is fixed inside one side of the second movable plate (701). A pusher (702) is fixed to one side of the buffer spring (707). A silicone block (703) is fixed to one side of the pusher (702). The warning structure (9) includes a movable groove (903) opened inside the meter body (1) and connected to the wiring port (8). A ceramic insulating block (901) fixedly connected to the wiring terminal (11) is slidably connected inside the movable groove (903). A return spring (902) is fixed on one side of the ceramic insulating block (901). A pressure sensor (904) in contact with the ceramic insulating block (901) is installed on one side inside the movable groove (903).

2. A single-phase prepaid smart meter according to claim 1, characterized in that: The drive assembly includes a movable block (606) fixed to the top of the first movable plate (603). The movable block (606) is internally threaded with a lead screw (607) that is rotatably connected to the meter body (1). A worm gear (608) is fixed to one side of the lead screw (607). A worm (609) that is rotatably connected to the meter body (1) is connected to one side of the worm gear (608). A drive motor (610) is installed at the bottom of the meter body (1).

3. A single-phase prepaid smart meter according to claim 2, characterized in that: The adjusting bolt (601) passes through the first moving plate (603) and extends to the outside of the meter body (1), and the pressure plate (604) and the wiring terminal (11) are located on the same horizontal center line.

4. A single-phase prepaid smart meter according to claim 2, characterized in that: The lead screw (607) has an external thread on its outer side wall, and the moving block (606) has an internal thread that cooperates with the external thread.

5. A single-phase prepaid smart meter according to claim 2, characterized in that: The output shaft end of the drive motor (610) is connected to the rotating end of the worm (609), and the worm (609) and the worm wheel (608) form a meshing connection.

6. A single-phase prepaid smart meter according to claim 1, characterized in that: The fixed rack (705) and the movable rack (706) are centrally symmetrically distributed on the axis of the gear (704).

7. A single-phase prepaid smart meter according to claim 1, characterized in that: The gears (704) are provided in two sets, and the two sets of gears (704) are symmetrically distributed on the vertical center line of the second moving plate (701).

8. A single-phase prepaid smart meter according to claim 1, characterized in that: The ceramic insulating block (901) and the moving groove (903) form a horizontal sliding connection, and the ceramic insulating block (901) and the moving groove (903) form a telescopic structure through the return spring (902).

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