Meter base reading and writing device

Abstract

The utility model discloses a meter bottom reading and writing device, which overcomes the problems that the meter bottom reading device in the prior art cannot start an infrared function and cannot read data of an electric meter when the electric meter is short of power, and comprises a main control module and a front-end reading module connected with the main control module, the main control module is connected with a relay module, and the front-end reading module is connected with the relay module. The front-end reading module is connected with a 485 communication module, the 485 communication module is connected with the main control module, the relay module is connected with a 220V power supply module, the front-end reading module comprises a detection spring, and the detection spring is respectively connected with the 220V power supply module and a meter to be detected. The electric meter reading device is provided with a 220V power supply, can directly read an electric meter without electricity in an internal battery, uses a 485 serial port for communication, is more stable and rapid in data transmission, and improves the reading efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to a meter bottom reading and writing device. Background Art

[0002] In modern power systems, electricity meters are key devices for monitoring and measuring electricity usage. As the equipment ages or is replaced, some meters will be scrapped. However, these scrapped meters contain important information about electricity usage, and their meter numbers, bottom data, etc. need to be recorded in the system after scrapping.

[0003] Manually reading records and then uploading them to the system is not only time-consuming but also easy to misread or input incorrectly. The existing meter bottom value reading device inserts the meter to be read into the device, and the power supply and 485 serial port interface of the meter are connected to the device. After the meter is powered on, the infrared terminal that scans the meter data, clicks the meter button, and the infrared terminal turns on the infrared shooting function to interact with the infrared protocol to obtain the meter data. However, when the above device is used, if the meter is left for a long time, the internal battery of the meter will be out of power. In this case, the infrared function of the meter cannot be turned on, and the meter data cannot be read. Summary of the invention

[0004] The utility model aims to overcome the problem in the prior art that the infrared function of the meter bottom value reading device cannot be turned on when the meter is out of power, and the meter data cannot be read. A meter bottom value reading and writing device is provided, which has its own 220V power supply and can directly read the meter whose internal battery has no power. By using 485 serial port communication, data transmission is more stable and fast, and reading efficiency is improved. By adopting spring power-on, it can be adapted to a variety of different models of meters.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A meter bottom reading and writing device comprises a main control module and a front-end reading module connected to the main control module, wherein the main control module is connected to a relay module, the front-end reading module is connected to a 485 communication module, the 485 communication module is connected to the main control module, the relay module is connected to a 220V power supply module, and the front-end reading module comprises a detection spring, which is respectively connected to the 220V power supply module and a meter to be tested.

[0007] During operation, the detection spring is connected to the meter to be tested, the main control module controls the relay module to work, the relay is turned on, the 220V power supply module is powered by the detection spring, and the meter data is read using the 485 communication module. Relays are used to control on and off to prevent accidental touch operations when the meter is not placed. The meter to be tested has different external connection holes, so there are also multiple detection springs, and the positions are different, so as to adapt to different types of meter models. The meter data reading device provided by the utility model comes with a 220V power supply, which can directly read the meter with no power in the internal battery. Using 485 serial port communication, the data transmission is more stable and fast, and the reading efficiency is improved. It can automatically read the scrapped meter number and bottom data, and automatically upload the read meter data to the system platform to realize the closed loop process. It realizes the automatic collection and transmission of power equipment data and improves the efficiency and accuracy of data collection.

[0008] Preferably, the front-end reading module includes an infrared detection module connected to the main control module and a thimble connected to the 485 communication module, and the thimble is connected to the meter to be tested.

[0009] The infrared detection module is used to detect whether the meter data reading device is inserted into the meter to be tested. If so, the meter to be tested will reflect infrared to turn on the infrared receiving tube in the infrared detection module, and the infrared detection module outputs a high level to the main control module. After the main control module detects the high level, it controls the relay module to work and uses the 220V power supply module to power the front-end reading module. The ejector pin is soldered to another PCB board and then inserted into the PCB board of the three-phase meter reading module, so that it can directly contact the 485 hole of the three-phase meter to complete the communication with the meter to be tested.

[0010] Preferably, the front-end reading module comprises a single-phase meter reading module and a three-phase meter reading module which are connected to each other, and both the single-phase meter reading module and the three-phase meter reading module are connected to the main control module.

[0011] The single-phase meter reading module is used to read the single-phase meter data, and the three-phase meter reading module is used to read the three-phase meter data. Both the single-phase meter reading module and the three-phase meter reading module have an infrared detection module, a detection spring, and a probe.

[0012] Preferably, the three-phase meter reading module includes a resettable fuse connected to the live wire in the 220V power supply module, the resettable fuse is connected to a voltage divider protection module, the voltage divider protection module is connected to a spring, and the live wire of the voltage divider protection module is used as the input live wire of the single-phase meter reading module.

[0013] The live wire first passes through the resettable fuse, which has a rapid increase in impedance after exceeding the holding current. It is non-conductive and automatically returns to normal when the rear end is short-circuited or high power is removed. The voltage-dividing protection module includes two cement resistors in parallel, which can also divide the voltage to provide protection in the event of a complete short circuit.

[0014] Preferably, the relay module comprises a relay, the relay is connected to a transistor, and an LED lamp is connected in parallel to a control pin of the relay.

[0015] The operation of the relay is controlled by a transistor, and an LED light is connected in parallel to the control pin of the relay. When the relay is working, the LED will light up, so that you can intuitively see whether the relay is in working condition.

[0016] Preferably, the 220V power supply unit comprises a 220V power input module and a step-down module connected to the 220V power input module, and the step-down module is connected to a voltage stabilizing module.

[0017] The live wire of the 220V power input module is processed through the fuse box, and then the RV1 varistor is added to provide overvoltage protection for the circuit control loop, and then through the safety capacitor and common mode filter to provide a stable and safe 200V AC power supply for the back end. The buck module is a module with isolation and voltage reduction, which converts the 220V AC voltage into a 5V DC voltage. The DC-DC low voltage difference LDO chip of the voltage regulator module converts the 5V DC voltage into a 3.3V DC voltage to provide a stable 3.3V voltage for the main control module.

[0018] Preferably, the main control unit is connected to an external interface module, which includes a reading connection port and an RGB light strip, wherein the reading connection port is respectively connected to a relay module and a front-end reading module, and the RGB light strip is connected to the main control module.

[0019] The RGB light strip is controlled by the main control module, which can be used to keep the power indicator light on and change the color in the working state. The reading connector is used to power the reading board of the front-end reading module and communicate with 485. The live wire LR and the neutral wire NR of the reading connector are controlled by the relay module.

[0020] Preferably, the main control unit is connected to a voice playing module, and the voice playing module includes a voice chip connected to the main control module and an audio power amplifier connected to a 220V power supply module.

[0021] Audio power amplifiers amplify audio so it plays louder and clearer.

[0022] Preferably, it comprises a shell, an insulating plate is installed inside the shell, the front-end reading module is installed on the insulating plate, a display screen is provided on the upper surface of the shell, and side indicator lights are installed on the side of the shell.

[0023] The insulation board is made of PC material, which plays an insulating role and prevents the detection spring from bending and contacting the sheet metal shell. The display screen is used to display the test results for easy observation by staff.

[0024] Preferably, a transparent protective door is installed on the front side of the shell, and a transparent window is provided on the upper surface of the shell.

[0025] The transparent protective door uses spring hinges to prevent people from accidentally reaching into the detection area and touching the detection needle and detection spring to get an electric shock, thereby improving safety. The transparent window allows you to clearly see the detection process during the detection process.

[0026] Therefore, the utility model has the following beneficial effects:

[0027] 1. The built-in 220V power supply is connected to the meter. When the battery inside the meter is out of power, the meter data can also be read.

[0028] 2. The power supply is through the spring, and multiple sets of springs can be adapted to various types of electric meters.

[0029] 3. Using 485 serial port communication, data transmission is more stable and faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the circuit structure of the utility model.

[0031] Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0032] Figure 3 It is a circuit structure diagram of the main control module in the utility model.

[0033] Figure 4 It is a circuit structure diagram of the 220V power input module in the utility model.

[0034] Figure 5 It is a schematic diagram of the circuit structure of the voltage reduction module in the utility model.

[0035] Figure 6 It is a circuit structure diagram of the voltage stabilizing module in the utility model.

[0036] Figure 7 It is a circuit structure diagram of the relay module in the utility model.

[0037] Figure 8It is a circuit structure diagram of the external interface module in the utility model.

[0038] Fig. 9 It is a circuit structure diagram of the 485 communication module in the utility model.

[0039] Fig.10 It is a circuit structure diagram of the voice playing module in the utility model.

[0040] Fig.11 It is a circuit structure diagram of a three-phase meter reading module in the utility model.

[0041] Fig.12 It is a schematic diagram of the circuit structure of the single-phase meter reading in the utility model.

[0042] In the figure: 1. Main control module; 2. Front-end reading module; 3. Relay module; 4. 485 communication module; 5. External interface module; 6. Voice playback module; 7. 220V power supply module; 8. Shell; 9. Single-phase meter reading module; 10. Three-phase meter reading module; 11. Side indicator light; 12. Three-phase area insulation board; 13. Transparent acrylic; 14. Display screen; 15. Single-phase area insulation board. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0044] Embodiment 1:

[0045] This embodiment is a meter bottom reading and writing device, including a housing 8 and a circuit module installed inside the housing. The circuit architecture is as follows: Figure 1 As shown, the circuit module includes a main control module 1, a front-end reading module 2, a relay module 3, a 485 communication module 4, an external interface module 5, a voice playback module 6 and a 220V power supply module 7. The main control module is connected to the relay module, the 485 communication module, the voice playback module, the front-end detection module and the 220V power supply module. The 220V power supply module is respectively connected to the external interface module, the front-end detection module, the voice playback module and the 485 communication module. The relay module is connected to the external interface module, and the external interface module is connected to the front-end detection module.

[0046] The front-end detection module includes a three-phase meter reading module 10 and a single-phase meter reading module 9. The three-phase meter reading module is used to read the data of the three-phase meter, and the single-phase meter reading module is used to read the data of the single-phase meter. The three-phase meter reading module and the single-phase meter reading module both include a detection spring and a thimble connected to the meter to be tested.

[0047] The detection spring is connected to the external hole of the meter to be tested to power on the meter to be tested; the ejector pin is connected to the 485 hole of the meter to be tested to realize 485 communication.

[0048] During operation, the front-end reading module is connected to the meter to be tested, the main control module controls the relay module to work, the relay is turned on, the 220V power supply module supplies power to the front-end reading module, the main control module uses the 485 communication module to read the meter data, and the voice playback module can play the test results. Relays are used to control the on and off to prevent accidental touch operation when the meter to be tested is not placed. The meter data reading device provided in this embodiment comes with a 220V power supply, which can directly read meters with no power in the internal battery. Using 485 serial port communication, data transmission is more stable and fast, and reading efficiency is improved. It can automatically read the scrapped meter number and bottom data, and automatically upload the read meter data to the system platform to realize a closed-loop process. The automatic collection and transmission of power equipment data is realized, and the efficiency and accuracy of data collection are improved.

[0049] like Figure 2 As shown, a single-phase detection area and a three-phase detection area are provided inside the housing. The single-phase detection area is used to place the single-phase meter to be tested and read the data of the single-phase meter. The bottom of the single-phase detection area is a single-phase area insulation board 15, and a single-phase meter reading module is installed on the single-phase area insulation board.

[0050] On the front of the shell, a single-phase meter transparent protective door is provided opposite to the single-phase detection area. The single-phase meter transparent protective door adopts spring hinges to prevent people from accidentally reaching into the detection area and touching the detection needle and detection spring to cause electric shock, thereby improving safety.

[0051] Similarly, the three-phase detection area is used to place the three-phase meter to be tested and read the data of the three-phase meter. The bottom of the three-phase detection area is a three-phase area insulation board 12, and a three-phase meter reading module is installed on the three-phase area insulation board.

[0052] On the front of the shell, a transparent protective door for a three-phase meter is provided opposite to the three-phase detection area. The transparent protective door adopts spring hinges to prevent people from accidentally reaching into the detection area and touching the detection needle and detection spring to cause electric shock, thereby improving safety.

[0053] The upper surface of the shell is made of transparent acrylic 13 so that the operation process can be clearly seen during the meter data reading process.

[0054] A display screen 14 is installed on the upper surface of the housing for displaying meter data reading results.

[0055] A side indicator light 11 is also installed on the side of the housing.

[0056] When using, place the meter to be tested in the corresponding detection area. For example, a single-phase meter is placed in the single-phase detection area. The detection spring and probe of the single-phase meter reading module are inserted into the corresponding detection position on the single-phase meter to read the bottom value of the single-phase meter. The operation is simple and easy to use.

[0057] Embodiment 2:

[0058] This embodiment is a meter bottom reading and writing device. Based on the first embodiment, this embodiment also includes a specific circuit structure.

[0059] like Figure 3 As shown, the main control module includes a main control chip U4, a peripheral circuit and an indicator light circuit, and the peripheral circuit, the crystal oscillator circuit and the indicator light circuit are all connected to the main control chip U4.

[0060] In this embodiment, the main control chip U4 uses a single-chip microcomputer STM32F103CBT6, which is widely used, powerful, and has many functions. The surrounding circuits constitute the smallest circuit of the single-chip microcomputer, which is also the most stable peripheral circuit.

[0061] For example, the peripheral circuit includes a crystal oscillator circuit, which includes a crystal oscillator Y2 and capacitors C13 and C15. Both ends of the crystal oscillator Y2 are respectively connected to one end of a capacitor, and the other end of the capacitor is grounded; both ends of the crystal oscillator Y2, one end is connected to the OSC32-IN end of the main control chip U4, and the other end is connected to the OSC32-OUT end of the main control chip U4.

[0062] The crystal oscillator circuit provides a stable clock signal for the main control module. The OSC32-IN pin receives the clock signal input of the external crystal oscillator, and the OSC32-OUT pin outputs the clock signal after amplification and shaping by the oscillator, forming a stable oscillation loop.

[0063] The indicator light circuit includes a diode D7 (light emitting diode), a diode D8 (light emitting diode), a resistor R23 and a resistor R24. The cathode of the diode D7 is grounded, the anode of the diode D7 is connected to one end of the resistor R23, and the other end of the resistor R23 is connected to the 3.3V power input end of the main control chip U4; one end of the diode D8 is connected to the PA1 pin of the main control chip U4, the other end of the diode D8 is connected to one end of the resistor R24, and the other end of the resistor R24 ​​is connected to the 3.3V power input end of the main control chip U4.

[0064] Diode D7 is the power indicator light, and diode D8 is the running light. The power indicator light can visually show whether the power supply is normal, and the running light can show whether the microcontroller is working normally.

[0065] The 220V power supply module includes a 220V power input module, a voltage step-down module and a voltage stabilizing module. The 220V power input module is connected to the voltage step-down module. The voltage step-down module is respectively connected to the external interface module, the voltage stabilizing module, the voice playback module, the front-end reading module and the 485 communication module. The voltage step-down module is connected to the main control module.

[0066] like Figure 4 As shown, the 220V power inlet module includes a power inlet P1, a fuse box F1, a varistor RV1, a safety capacitor C1 and a common mode filter L1. The two interfaces of the power inlet P1 are respectively connected to the neutral line N and the live line L. One end of the fuse box F1 is connected to the live line, and the other end of the fuse box F1 is connected to one end of the varistor RV1, and the other end of the varistor RV1 is connected to the neutral line; one end of the safety capacitor C1 is connected to the live line, and the other end of the safety capacitor C1 is connected to the neutral line; the input end L (pin 1) of the common mode filter L1 is connected to the live line, the input end N (pin 2) of the common mode filter L1 is connected to the neutral line, and the output end of the common mode filter L1 is connected to the step-down module.

[0067] In this embodiment, the 220V power input module uses a VH3.96 terminal with a lock. Through the 220V power input module, the live wire is processed: first through the F1 fuse box, the F1 fuse box contains a one-time fuse with a maximum current of 1A; then the RV1 varistor is added to provide overvoltage protection for the circuit control loop; finally, through the safety capacitor C1 and the common mode filter L1, a stable and safe 200V AC power supply is provided to the back end.

[0068] like Figure 5 As shown, the step-down module includes a power module U2, the input end of the power module U2 is connected to the 220V power input module, the output end of the 220V power input module is connected in parallel with a resistor C2, one end of the resistor C2 is grounded, and the other end of the resistor C2 outputs a DC 5V power supply.

[0069] In this embodiment, the power module U2 adopts the HLK-10M05 chip. The step-down module has an isolation step-down function and a maximum output of 5V 2A. The output itself also has overcurrent protection and short-circuit protection.

[0070] like Figure 6 As shown, the voltage stabilizing module includes a voltage stabilizing chip U1, the input terminal IN of the voltage stabilizing chip U1 is connected to the DC 5V power output terminal of the step-down module, and a capacitor C3 is connected in parallel between the input terminal IN of the voltage stabilizing chip U1 and the ground terminal; the output terminal of the voltage stabilizing chip U1 outputs a 3.3V DC power supply, and the output terminal of the voltage stabilizing chip U1 is grounded through a capacitor C4; the output terminal of the voltage stabilizing chip U1 is connected to the main control module.

[0071] In this embodiment, the voltage stabilizing chip U1 adopts a commonly used DC-DC low voltage difference LDO chip to provide a stable 3.3V voltage for the main control module.

[0072] like Figure 7 As shown, the relay module includes a neutral line control module and a live line control module, and the circuit compositions of the neutral line control module and the live line control module are completely consistent.

[0073] Taking the firewire control module as an example, the firewire control module includes relay K2, diode D6 (light emitting diode), diode D4, resistor R22, resistor R18, resistor R19, resistor R20 and transistor Q2. One end of the relay K2 coil terminal is connected to the 5V power supply, and the other end of the relay K2 coil terminal is connected to the transistor collector; the cathode of diode D4 is connected to the 5V power supply, the anode of diode D4 is connected to the cathode of diode D6, the anode of diode D6 is connected to one end of resistor R22, and the other end of resistor R22 is connected to the 5V power supply. ; The transistor collector is connected to the cathode of diode D6, the transistor emitter is connected to one end of resistor R20, and the other end of resistor R20 is grounded; the transistor base is respectively connected to one end of resistor R18 and one end of resistor R19, the other end of resistor R19 is grounded, and the other end of resistor R8 is connected to the RELAY-L end of the main control chip U4 (the neutral line control module is connected to the RELAY-N end of the control chip U4); the normally closed contact of relay K2 is connected to the live wire (the neutral line control module is connected to the neutral wire), and the normally closed contact of relay K2 is connected to the external interface module.

[0074] The relay module is the part that supplies power to the spring of the front-end control module. The relay is used to control on and off to prevent accidental operation when the meter is not placed. The infrared part of the front-end control module is used to determine whether the meter to be tested is placed, so that the main control module can control on and off.

[0075] The relay is controlled by a 5V power supply, and the operation of the relay is controlled by a transistor. At the same time, an LED light (a light emitting diode in this embodiment) is connected in parallel to the control pin of the relay. When the relay is working, the LED will light up, so that you can intuitively see whether the relay is in working state.

[0076] like Figure 8 As shown, the external interface module includes a light strip reserved interface P7 and a light strip reserved interface P10, a power supply GND interface, a display screen connection port P6, a side light strip interface and a reading board connection port P2.

[0077] The power supply GND interface includes a capacitor C21 and a resistor R31, the resistor R31 is connected in parallel with the capacitor C21, one end of the resistor R31 is connected to the power supply ground GND, and the other end of the resistor R31 is connected to the ground AGND. The external interface module is the connection between the external interface and the ground AGND and the power supply GND.

[0078] GND is the ground terminal of the DC power supply, and AGND is the earth terminal. Connect the two to ensure that the shell earth and the DC ground terminal are not directly connected together during installation. At the same time, connecting the resistor and capacitor between the two is to protect the DC power supply terminal. Capacitor C21 can isolate low-frequency high voltage, static electricity, etc. to protect the circuit board; resistor R31 can prevent ESD (electrostatic discharge) from damaging the circuit board.

[0079] Display screen connector P6 provides power supply and 485 communication for the display screen.

[0080] The side light strip interface includes interface P3 and interface P4. The side light strip interface is controlled by the main control module. The light can control the color of each light according to the instructions of the main control module. There are many functional colors. In this embodiment, it is used to make the power indicator light always on and change the color in the working state.

[0081] The reading board connector P2 is used to power the reading board of the front-end reading module and for 485 communication. The live wire LR and the neutral wire NR are controlled by the relay module, and SIGN1 and SIGN2 are the infrared trigger signals of the two reading boards in the front-end reading module.

[0082] like Fig. 9 As shown, the 485 communication module includes a 485 chip U3, a capacitor C5, a diode D1, a resistor R6, a resistor R7, a resistor R9, a resistor R10, a diode D2 and an interface J1. The 485 chip U3 adopts a chip model SN75LBC184D. The VCC end of the 485 chip U3 is connected to the 5V power output end of the buck module. The DE pin and RD pin of the chip U3 are connected to the PA8 pin of the main control chip U4. The D pin of the 485 chip U3 is connected to the PA9 pin of the main control chip U4. One end of capacitor C5 is connected to the VCC end of the 485 chip U3, and the other end of capacitor C5 is grounded; one end of resistor R6 is grounded, and the other end of resistor R6 is respectively connected to one end of resistor R7 and the B end of the 485 chip U3, and the other end of resistor R7 is connected to interface J1; one end of resistor R8 is connected to the 5V power supply output end of the step-down module, and the other end of resistor R8 is respectively connected to the B end of the 485 chip U3 and one end of resistor R9, and the other end of resistor R9 is connected to interface J1; a diode D2 is connected between the other end of resistor R9 and the other end of resistor R7.

[0083] J1 is the DB9 interface used for external connection to the computer.

[0084] The 485 communication module is the part that ensures data reading. Since the communication mode of the electric meter is 485, this embodiment also directly uses 485 for communication. 485 has multi-station capability, that is, it can communicate with each other by only connecting to the 485 network. This embodiment mounts 3 to 4. The 485 communication module of this embodiment is connected to the meter part, the main control part, the display part, and the DB9 external connection part.

[0085] like Fig.10 As shown, the voice playback module includes a voice chip U5, an audio power amplifier U6, an external speaker wiring port P8 and a download interface P9. The audio power amplifier U6 is connected to the external speaker wiring port P8, the voice chip U5 and the download interface P9 are both connected to the 5V power output end of the step-down module, and the voice chip U5 is also connected to the main control module.

[0086] The voice chip U5 can store voices with a total duration of up to 60 seconds; generally, it stores the voices of "reading start" and "reading end", and the main control module emits sound by controlling the external protocol.

[0087] The audio power amplifier U6 amplifies the audio so that the playback sound is louder and clearer.

[0088] Download interface P9 is the reserved voice chip program download interface.

[0089] like Fig.11 As shown, the three-phase meter reading module includes a reading board connector J1, a resettable fuse FU1, a cement resistor R1, a cement resistor R2, a large spring, a small spring, an indicator light J3, a small meter reading board connector J2, a 485 P pin, a 485 N pin and an infrared detection module. Pin 5 (live wire connection end) of the reading board connector J1 is connected to one end of the resettable fuse FU1, and the other end of the resettable fuse FU1 is respectively connected to one end of the cement resistor R1 and one end of the cement resistor R2. The other end of the cement resistor R2 and the other end of the cement resistor R1 are both connected to a group of detection springs (including a large spring and a small spring); Pin 5 (live wire connection end) of the small meter reading board connector J2 is also connected to a group of detection springs, and Pin 1 (neutral line connection end) of the small meter reading board connector J2 is connected to another group of detection springs; the 485 P pin is connected to Pin 3 of the small meter reading board connector J2, and the 485 N pin is connected to Pin 4 of the small meter reading board connector J2.

[0090] The infrared detection module includes an infrared receiving tube IR1 and resistors R3, R4, R5, capacitors C1 and C2 connected to the infrared receiving tube IR1. The infrared receiving tube IR1 is connected to the 5V power output end of the step-down module and the SING1 end of the main control chip U4.

[0091] The 220V power supply of the three-phase meter reading module comes from the reading board connector P2 through the harness, and the live wire is protected at the same time: the live wire first passes through the resettable fuse FU1 (maximum voltage 250V, holding current 500mA). The resettable fuse has the function of rapidly increasing impedance after exceeding the holding current. The resettable fuse is non-conductive and automatically returns to normal when the rear end is short-circuited or high power is eliminated.

[0092] Cement resistors R1 and R2 are connected in parallel, which is equivalent to a 5K 10W resistor. They can also divide the voltage to provide protection when the three-phase meter reading module is completely short-circuited.

[0093] Because the three-phase meter has two different external connection hole positions, this embodiment provides two types of springs, a large spring and a small spring, and the positions are different.

[0094] The ejector pin is soldered to another PCB board and then inserted into the three-phase reading module PCB, so that it can directly contact the 485 hole position of the three-phase meter to complete the 485 communication with the meter.

[0095] Infrared detection module, when the meter is inserted, the meter will reflect infrared to turn on the infrared receiving tube IR1 of the infrared detection module. At this time, SIGN1 outputs a high level. After the main control module detects the high level, it controls the relay module to work, supplies power to the front-end reading module, and powers on through the spring.

[0096] The reader board connector J1 is connected to the reader board connector P2 using a harness to pass signals such as 220V, 5V, SIGN1, SIGN2, and RS485.

[0097] The small meter reading board connector J2 uses a harness to connect to the single-phase meter reading module.

[0098] The indicator light J3 is used to indicate that it lights up when the 220V power supply of the front-end reading module is turned on, and goes out when the front-end reading module is short-circuited or turned off.

[0099] like Fig.12 As shown, the single-phase meter reading module includes a small meter reading board connector P1, a large spring, a small spring, a 485P ejector pin, a 485 N ejector pin and an infrared detection module. The circuit structure of the infrared detection module is consistent with that of the three-phase meter reading module. The difference is that the infrared detection module of the single-phase meter reading module is connected to the SING2 pin of the main control chip U4.

[0100] The connector P1 of the small meter reading board is connected to J2 of the three-phase meter reading module. The live wire of the 220V power supply in the single-phase meter reading module has passed through the cement resistor of the three-phase meter reading module. The rest of the functions and modules are the same as those of the three-phase meter reading module.

[0101] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A meter bottom reading and writing device, characterized in that: It includes a main control module and a front-end reading module connected to the main control module, the main control module is connected to a relay module, the front-end reading module is connected to a 485 communication module, the 485 communication module is connected to the main control module, the relay module is connected to a 220V power supply module, and the front-end reading module includes a detection spring, which is respectively connected to the 220V power supply module and the meter to be tested.

2. A meter bottom reading and writing device according to claim 1, characterized in that: The front-end reading module includes an infrared detection module connected to the main control module and a thimble connected to the 485 communication module, and the thimble is connected to the meter to be tested.

3. A meter bottom reading and writing device according to claim 1 or 2, characterized in that: The front-end reading module comprises a single-phase meter reading module and a three-phase meter reading module which are connected to each other, and both the single-phase meter reading module and the three-phase meter reading module are connected to the main control module.

4. A meter bottom reading and writing device according to claim 3, characterized in that: The three-phase meter reading module includes a resettable fuse connected to the live wire in the 220V power supply module. The resettable fuse is connected to a voltage divider protection module. The voltage divider protection module is connected to a spring, and the live wire of the voltage divider protection module is used as the input live wire of the single-phase meter reading module.

5. A meter bottom reading and writing device according to claim 1 or 2, characterized in that: The relay module comprises a relay, the relay is connected to a triode, and an LED lamp is connected in parallel to a control pin of the relay.

6. A meter bottom reading and writing device according to claim 1, characterized in that: The 220V power supply module includes a 220V power input module and a step-down module connected to the 220V power input module, and the step-down module is connected to a voltage stabilizing module.

7. A meter bottom reading and writing device according to claim 1, 2 or 6, characterized in that: The main control module is connected to an external interface module, and the external interface module includes a reading connection port and an RGB light strip, the reading connection port is respectively connected to the relay module and the front-end reading module, and the RGB light strip is connected to the main control module.

8. A meter bottom reading and writing device according to claim 1, 2 or 6, characterized in that: The main control module is connected to a voice playing module, and the voice playing module includes a voice chip connected to the main control module and an audio power amplifier connected to a 220V power supply module.

9. A meter bottom reading and writing device according to claim 1, 2 or 6, characterized in that: It comprises a shell, an insulating plate is installed inside the shell, the front-end reading module is installed on the insulating plate, a display screen is provided on the upper surface of the shell, and a side indicator light is installed on the side of the shell.

10. A meter bottom reading and writing device according to claim 9, characterized in that: A transparent protective door is installed on the front of the shell, and a transparent window is arranged on the upper surface of the shell.

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