A carrier communication carbon monoxide detector for mines

Abstract

The present invention relates to a carrier communication carbon monoxide detector for mining. The carbon monoxide detector is arranged in a mine room, and an AC36V lighting circuit is provided in the mine room. The carbon monoxide detector comprises: a lamp holder, a shell, a circuit board, a CO sensor and a first carrier communication module. The lamp holder is arranged at one end of the shell, and the lamp holder is connected to the AC36V lighting circuit. The AC36V power supply supplies power to the circuit board through the AC36V lighting circuit and the lamp holder. The circuit board is provided with a first carrier communication module, and the circuit board is connected to the CO sensor installed on the shell. The beneficial effects of the present invention are as follows: the present invention uses the existing AC36V lighting circuit in the mine room in combination with the DC / DC voltage conversion technology to power the detector, and there is no need to install an additional 380 / 220V transformer or an AC380V input switching DC power supply, thereby greatly simplifying the power supply system and reducing the cost of system installation and maintenance. At the same time, the existing AC36V lighting circuit is used for carrier communication, and there is no need to set up special cables.

Description

Technical Field

[0001] The present invention relates to the technical field of detectors, and more specifically, to a carrier communication carbon monoxide detector for mining. Background Art

[0002] When blasting underground, a large amount of carbon monoxide (CO) gas will be produced. If ventilation is not carried out in time or the wind speed is too low, harmful gases such as carbon monoxide will exceed the standard, which may cause poisoning of underground workers, fire or even explosion. Therefore, it is very important to detect the concentration of carbon monoxide in the mine room and return air lane in a timely and effective manner, which is one of the powerful guarantees for the life safety of underground workers. At present, non-coal mining uses a large number of trackless equipment such as scrapers and rock drills, and the main components of their exhaust are carbon monoxide, hydrocarbons, nitrogen oxides, etc. Since the mine room space is relatively small and the ventilation is not smooth, online detection of carbon monoxide is indispensable even when there is no blasting.

[0003] At present, the CO detection system in non-coal mines in China usually includes: a CO detector installed in the mine and a CO detector terminal installed at the entrance of the mine. The detector and the terminal are connected with a shielded signal cable, of which two cores are power lines and two cores are CO concentration signal lines. However, there is no AC220V power supply in the underground environment. Some manufacturers use 380 / 220V transformers for power supply, and some manufacturers use AC380V input switching DC power supply, which is troublesome and expensive. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and to provide a carrier communication carbon monoxide detector for mining.

[0005] In a first aspect, a mine carrier communication carbon monoxide detector is provided, which is used to report detection data to a mine carrier communication carbon monoxide detector terminal; the carbon monoxide detector is arranged in a mine room, and an AC36V lighting circuit is provided in the mine room; the carbon monoxide detector includes: a lamp holder, a housing, a circuit board, a CO sensor and a first carrier communication module;

[0006] Among them, the lamp holder is arranged at one end of the shell, and the lamp holder is connected to the AC36V lighting circuit; the AC36V power supply supplies power to the circuit board through the AC36V lighting circuit and the lamp holder; a first carrier communication module is arranged on the circuit board, and the circuit board is connected to the CO sensor installed on the shell.

[0007] Preferably, the housing is also provided with a temperature sensor, a two-color light emitting diode, and a buzzer; the temperature sensor, the two-color light emitting diode, and the buzzer are all connected to the circuit board; and the circuit board 3 is also provided with a first single-chip microcomputer.

[0008] Preferably, the first carrier communication module adopts RS485 protocol.

[0009] Preferably, the circuit board is provided with a first inductive wave trap, a first rectifier circuit and a DC / DC conversion module;

[0010] Among them, one path of the AC36V power supply is directly connected to the first carrier communication module, and the other path passes through the first inductor wave arrester and the first rectifier circuit to obtain the first initial DC power supply; the first initial DC power supply is converted into a target DC power supply by the DC / DC conversion module, and the target DC power supply is used to supply the first carrier communication module, the CO sensor, the temperature sensor, the first single-chip microcomputer and the sound and light alarm circuit; the sound and light alarm circuit includes a two-color light emitting diode and a buzzer.

[0011] Preferably, the first initial DC power supply is converted into a target DC power supply via a DC / DC conversion module, including: the initial DC power supply is converted into a first main DC power supply via a first DC / DC converter; the initial DC power supply is converted into a sensor alternating heating DC power supply via a second DC / DC converter.

[0012] Preferably, when the CO concentration exceeds a preset threshold, the first single chip microcomputer records the time and duration when the CO concentration exceeds the preset threshold, and saves the power-on and power-off times of the carbon monoxide detector.

[0013] In a second aspect, a carrier communication carbon monoxide detector terminal for mining is provided, which is used to receive the detection data reported by any of the carbon monoxide detectors in the first aspect and set parameters for the carbon monoxide detector; the carbon monoxide detector terminal includes: a second inductive wave trap, a second rectifier circuit, a third DC / DC converter, a second carrier communication module, and a second single-chip microcomputer;

[0014] Among them, one path of the AC36V power supply is directly connected to the second carrier communication module, and the other path passes through the second inductor wave resistor and the second rectifier circuit in sequence to obtain the second initial DC power supply, and the second initial DC power supply is converted into a second main DC power supply through the third DC / DC converter; the second main DC power supply is used to supply the second carrier communication module.

[0015] Preferably, the carbon monoxide detector terminal is also provided with an Ethernet port, and the carbon monoxide detector terminal uploads the detection data to the ground production scheduling room through the Ethernet port.

[0016] In a third aspect, a carrier communication carbon monoxide detection system for mining is provided, comprising: a carbon monoxide detector terminal and at least one carbon monoxide detector; the carbon monoxide detector is any one of the carbon monoxide detectors described in the first aspect; the carbon monoxide detector terminal is communicatively connected to the at least one carbon monoxide detector.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention uses the existing AC36V lighting circuit in the mine room combined with DC / DC voltage conversion technology to power the detector and the terminal, without the need to install an additional 380 / 220V transformer or an AC380V input switching DC power supply, thereby greatly simplifying the power supply system and reducing the cost of system installation and maintenance. At the same time, the existing AC36V lighting circuit is used for carrier communication, without the need to set up special cables.

[0019] 2. The present invention uses a built-in carrier communication module (using RS485 protocol) so that the carbon monoxide detector can report the detected CO concentration data to the terminal in real time, and multiple CO detectors can be installed in the mine room to avoid detection blind spots.

[0020] 3. When the CO concentration exceeds the preset threshold, the present invention automatically records the time and duration of exceeding the standard through the single-chip microcomputer, triggers the two-color light-emitting diode and buzzer for sound and light alarm, and saves the power-on and power-off times at the same time, providing an important basis for accident tracing and daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an existing carbon monoxide detection system;

[0022] Figure 2 A schematic diagram of the structure of a carrier communication carbon monoxide detection system for mining provided by an embodiment of the present invention;

[0023] Figure 3 A circuit diagram of a carrier communication carbon monoxide detector for mining provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a sensor measurement circuit and heating voltage requirements during normal operation provided by an embodiment of the present invention;

[0025] Figure 5 A circuit diagram of a carrier communication carbon monoxide detection terminal for mining provided by an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the structure of a carrier communication carbon monoxide detector for mining provided by an embodiment of the present invention;

[0027] Figure 7A schematic diagram of the packaging of a carrier communication carbon monoxide detector for mining provided by an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of a control circuit for an 11W constant current source LED lighting lamp provided by an embodiment of the present invention;

[0029] Fig. 9 A schematic diagram of adding an Ethernet port to a carbon monoxide detection terminal provided in an embodiment of the present invention;

[0030] Fig.10 A circuit schematic diagram of a carrier communication carbon monoxide detector for mining provided by an embodiment of the present invention;

[0031] Fig.11 A circuit schematic diagram of a carrier communication carbon monoxide detection terminal for mining provided by an embodiment of the present invention;

[0032] Description of the reference numerals: lamp socket 1 , housing 2 , circuit board 3 , CO sensor 4 , temperature sensor 5 , two-color light emitting diode 6 , buzzer 7 , first carrier communication module 8 . DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0034] Embodiment 1:

[0035] like Figure 1 As shown, the existing non-coal mine room CO detection system usually includes: a CO detector installed in the mine room and a CO detector terminal installed at the entrance of the mine room. The detector and the terminal are connected with a shielded signal cable, in which two cores are power lines and two cores are CO concentration signal lines.

[0036] Existing CO detectors need to be connected to power lines and signal lines. Some use AC220V power, while others are directly supplied with DC12V power by the terminal. The detector has a built-in single-chip microcomputer and peripheral circuits, and a CO sensor probe at the bottom. The PPM is displayed using an LED digital tube, and can give an on-site sound and light alarm. Its output is a current signal or a frequency signal. Some detectors are equipped with an over-limit relay output to automatically turn on the local fan for ventilation when the PPM exceeds the standard. Due to the high cost of laying cables, the detectors are expensive, and most detector terminals only support one detector, so most mines only install one sensor, which has blind spots. The main indicators of common detectors are as follows:

[0037] Installation method: hanging

[0038] Monitoring object: CO gas concentration

[0039] Output signal: 4-20mA or 20-1000Hz frequency signal

[0040] Measuring range: 20-1000 PPM

[0041] Alarm: Sound and light alarm when reaching the set upper limit

[0042] Display: 4-digit LED digital tube display

[0043] Response time: ≦10 seconds

[0044] Underground workers must know whether the CO concentration in the mine is normal at the entrance of the mine room. If it exceeds the standard, they must not enter rashly. Generally, an instrument box (detector terminal) is installed at the entrance of the mine room to receive the current or frequency signal of the detector, display alarm and control ventilation fan after signal processing.

[0045] At present, CO detector terminals are generally based on PLC. PLC uses a building block mode, which can easily process current or frequency signals and increase relay contact output. Some mines require the terminal to be able to display LCD and voice alarm, while others require a large area of ​​LED dot matrix Chinese display, with the LED warning screen prompting personnel whether they can enter the mine room. Although the PLC system is effective, it has poor professional level, high equipment costs, and it is difficult to support multiple detectors. In particular, parameter settings need to be improved, and currently they can only be rewritten from the PLC program through a laptop.

[0046] In addition, the existing detector connection terminals mostly use 4×1.0mm2 shielded signal cables, which are as short as 20 meters and as long as hundreds of meters. If you want to lead out the detector control relay contacts, you need to add an extra cable (the signal line cannot be mixed with 380V AC current in a shielded cable).

[0047] In order to solve the above-mentioned problems of the prior art, Figure 2 As shown, an embodiment of the present application provides a carrier communication carbon monoxide detection system for mining, comprising: a carbon monoxide detector terminal and at least one carbon monoxide detector; the carbon monoxide detector terminal is communicatively connected with the at least one carbon monoxide detector.

[0048] Specifically, the original AC36V lighting circuit in the mine room is connected to the lighting lamp through a spiral lamp socket. The embodiment of the present application uses the original AC36V lighting circuit in the mine room for carrier communication and to power the carbon monoxide detector and the terminal. The carbon monoxide detector is similar to a lighting bulb, and has a spiral lamp socket (E27), which can be directly screwed onto the lighting circuit without the need to install a special cable. In addition, the carrier communication adopts the RS485 protocol, and multiple carbon monoxide detectors can be installed in the mine room to avoid detection blind spots.

[0049] It should be noted that the neutral point of the underground power transformer is not grounded, that is, there is no AC220V power supply underground, which creates difficulties for the power supply of the carbon monoxide detection system and increases costs. However, an AC36V lighting line must be installed in the mine room, and the lighting line must be reliable and stable. Usually, a 380V / 36V lighting transformer is placed at the entrance of each mine room. Underground workers can ignore whether the CO detector is normal, but they cannot do without lighting. The CO detector is connected in parallel with an ordinary light bulb, and its line does not require additional maintenance, which ensures the normal operation of the CO detection system.

[0050] The detector and terminal in the carbon monoxide detection system provided in the embodiment of the present application adopt DC / DC technology, and the power supply is directly taken from AC36V, which can efficiently obtain the DC power supply required by the system. More importantly, the detector and the terminal are both equipped with an AC carrier communication module, and the carrier communication adopts the RS485 protocol. The terminal can set parameters and read data for each detector as a host, and the detector can respond and report CO detection data as a slave.

[0051] Embodiment 2:

[0052] Based on Example 1, Example 2 of the present application provides a more specific mine-used carrier communication carbon monoxide detector, which is used to report detection data to the mine-used carrier communication carbon monoxide detector terminal; the carbon monoxide detector is arranged in the mine room, and an AC36V lighting line is set in the mine room.

[0053] like Figure 6 and Figure 7 As shown, the carbon monoxide detector includes: a lamp holder 1, a housing 2, a circuit board 3, a CO sensor 4 and a first carrier communication module 8.

[0054] Among them, the lamp socket 1 is set at one end of the shell 2, and the lamp socket 1 is connected to the AC36V lighting circuit; the AC36V power supply supplies power to the circuit board 3 through the AC36V lighting circuit and the lamp socket 1; a first carrier communication module 8 is set on the circuit board 3, and the first carrier communication module 8 adopts the RS485 protocol. The circuit board 3 is connected to the CO sensor 4 installed on the shell 2.

[0055] In addition, the housing 2 is also provided with a temperature sensor 5, a two-color light emitting diode 6, and a buzzer 7; the temperature sensor 5, the two-color light emitting diode 6, and the buzzer 7 are all connected to the circuit board 3. The circuit board 3 is also provided with a first single chip microcomputer (MCU).

[0056] like Figure 3 As shown, a first inductive wave trap, a first rectifier circuit and a DC / DC conversion module are arranged on the circuit board 3 .

[0057] Among them, one path of the AC36V power supply is directly connected to the first carrier communication module 8 as a carrier communication channel, and the other path passes through the first inductor wave arrester and the first rectifier circuit to obtain the first initial DC power supply; the first initial DC power supply is converted into a target DC power supply through a DC / DC conversion module, and the target DC power supply is used to supply the first carrier communication module 8, CO sensor 4, temperature sensor 5, first single-chip microcomputer and sound and light alarm circuit; the sound and light alarm circuit includes a two-color light emitting diode 6 and a buzzer 7.

[0058] Specifically, the first initial DC power supply is converted into a target DC power supply through a DC / DC conversion module, including: the initial DC power supply is converted into a first main DC power supply through a first DC / DC converter; the initial DC power supply is converted into a sensor alternating heating DC power supply through a second DC / DC converter. For example, the first main DC power supply is a DC / DC 12V main power supply, and the sensor alternating heating DC power supply is a 5V / 1.5V alternating heating power supply.

[0059] When the first main DC power supply is a DC / DC 12V main power supply and the sensor alternating heating DC power supply is a 5V / 1.5V alternating heating power supply, the DC / DC 12V main power supply is directly supplied to the first carrier communication module 8 and is also supplied to V after being stepped down by a diode. CC Digital power and V A Analog power supply module, these two modules obtain 5V voltage after being stabilized by LM78L05 three-terminal regulator. A In addition to directly powering the sensor measurement electrodes and preamplifier op amp, the 4.096V reference voltage is obtained through secondary voltage regulation by MCP1541 as the reference for MCU analog-to-digital conversion.

[0060] The MCU and the first carrier communication module 8 perform duplex communication at TTL level, and the carrier communication line is directly connected to the AC36V power input, and the lighting line is used for carrier half-duplex communication. CC Digital power supply (5V) and V A Analog power supply (5V), they are usually independent power supplies, digital ground and analog ground are usually connected at only one point on the circuit board.

[0061] Please continue to refer to Figure 3 , the circuit board 3 also includes a preamplifier. The preamplifier is a common-mode amplifier that adjusts the sensor output voltage to 0-4.096V, and its output is directly connected to the ADC input of the MCU. The MCU has a built-in 12-bit analog-to-digital conversion function.

[0062] The MCU has a built-in voltage comparator. The negative end of the comparator can be connected to the internal REFV (1.19V) of the microcontroller, and the positive end is connected to the resistor voltage divider circuit. When the power supply voltage is lower than 5V, the MCU interrupt is triggered, and the MCU uses the remaining power of the capacitor to save data.

[0063] The MCU also supports a DS18B20 single-ended temperature sensor to detect the temperature of the mine room. This temperature is also used in the software for temperature compensation of the CO sensor.

[0064] In addition, the model of the MCU used in the embodiment of the present application can be STC8H2K12U, which is packaged as QFN20 and has 20 pins, and its functions fully meet the needs of the detector. Specifically, its functions include: high-speed operation, high anti-interference, wide operating voltage, 2K SRAM, IAP EEPROM, multiple 12-bit analog inputs, 2 high-speed serial ports, an SPI interface, four counters / timers, RTC calendar clock, one comparator for power-on / power-off interrupts, built-in watchdog and reset circuits, built-in high-precision (R / C) clock without external crystal oscillator. In addition, this single-chip microcomputer is compatible with C51 and supports Keil programming and simulation.

[0065] Of course, the detector's MCU can have a wider range of choices. Not only STC microcontrollers are available, but also microcontrollers from other manufacturers, such as Atmel's AVR microcontroller, STM32 microcontroller, MSP430 microcontroller, etc.

[0066] The first carrier communication module 8 used in the embodiment of the present application adopts the SEN-00 embedded power line carrier communication module produced by Hangzhou Xinshi Technology Co., Ltd., and its parameters are:

[0067] Working power supply: DC12V

[0068] Communication frequency: 9600 / 2400 optional

[0069] Interface type: TTL level serial interface RXD, TXD

[0070] Working environment: 0-220V, 50HZ

[0071] Power line carrier frequency: 290kHz

[0072] Modulation and demodulation mode: Narrowband / zero-crossing dual mode optional

[0073] Communication distance: 1000m (the specific communication distance depends on the application environment)

[0074] After testing, this module adopts 9600BD, narrowband modulation and demodulation mode, and has good communication effect in AC36V circuit.

[0075] For the CO sensor 4, the embodiment of the present application adopts the domestic MQ-7 series sensor, and its measurement circuit and heating requirements are as follows Figure 4 Specifically, the heating resistance is 31±3Ω, requiring a high voltage of 5V for 60 seconds and a low voltage of 1.5V for 90 seconds, alternating between these. Due to the large heating current, V is directly obtained from DC12V. H The voltage drop of the adjustment transistor is large and the efficiency is low, so a DC / DC conversion circuit is used. CC ) is connected to the analog power supply V A , to ensure the voltage stability of the signal circuit and avoid interference from the digital circuit. The sensor heating electrode is connected to V H , a dedicated heating power supply controlled by MCU.

[0076] Fig.10 This is the circuit diagram of the mine-used carrier communication carbon monoxide detector. Fig.10 As shown, P1 introduces AC36V power supply, which is rectified and filtered by D1, L2, EC1, and C1 to V1. The measured V1=43V. Inductors L1 and L2 both have wave blocking effects. The so-called wave blocking is to prevent the carrier signal from entering to prevent the carrier signal from attenuating and causing electromagnetic interference. The carrier signal frequency is 290kHz, so the impedance of L1 is Z=2πfL1=1827Ω. After DC / DC conversion by U1 (XL7007), D2, L3, EC3 and other components, the voltage V2=12.6V. The output voltage of this circuit is V2=(1.25+ ) = 12.6V. The resistors R7 and R8 divide the voltage to obtain the power-off detection voltage (CMP+). When V2 = 12.6V, Vcmp+ = 1.383V, which is greater than the MCU internal reference voltage REF (1.19V). When V2 = 10.84V, Vcmp+ <= 1.19V, triggering an MCU comparator interrupt. At this time, due to the effect of the capacitor and diodes D4-D7, the MCU input voltage is maintained at 5V and can continue to work to write the data to be saved into the EEPROM. In fact, the operating voltage of the MCU is 3-5V. On the one hand, the four diodes D4-D7 reduce the V2 voltage to V3 = 9.8V, reduce the input voltage of U3 and U4 (LM78L05), and enhance their load capacity; on the other hand, when the detector loses power, it prevents the capacitors such as EC5 from reflux, thereby extending the working time of the MCU.

[0077] Please continue to refer to Fig.10 , the embodiment of the present application divides the digital voltage and the analog voltage into two units and isolates them with inductor L4. The analog ground and the digital ground are connected at one point through the zero-ohm resistor R1. The analog voltage is mainly due to the power supply of the sensor measurement electrode and the preamplifier. In this embodiment, the selected MCU pins are few, and the MCU digital / analog power supply shares one pin. The MCU reference voltage is obtained by U5 (MCP1541), which is 4.096V. U2 (XL7007) provides the sensor heating power supply VH. When P5.4=0 of the MCU, the analog switch U3 (74HC1G66GV) is in the open state, the resistor R6 is equivalent to an open circuit, and the output voltage of U2 is determined by R4 and R5, VH=5V; when P5.4=1, the analog switch U3 is closed, and its on-resistance is about 40Ω, which can be ignored. At this time, R4 and R6 are connected in parallel, and the output voltage of U2 is obviously reduced, VH=1.5V. The DS18B20 dat data line requires a pull-up resistor. In fact, the MCU has a built-in 4K optional pull-up resistor, but the current is taken from the microcontroller, so an external 5K pull-up resistor is added here, and P3.2 adopts the open collector mode, which is safer and more reliable. The selected MCU has four timers / counters, Timer0, which is used for timing and is set to interrupt once every 10mS, such as the time interval of ADC sampling, the time control of alternating heating of sensors, etc.; Timer1 and Timer2 are used for two serial port baud rate control; and there is also a 24-bit Timer11, which uses its divided frequency output to drive the buzzer. By changing the initial value of Timer11, you can change its output frequency, thereby changing the tone of the buzzer. The playback length (beat) of each tone is controlled by the Timer0 interrupt function. It should be noted that, Fig.10 The microcontroller P1.0 / P1.1 must be swapped using SFR settings.

[0078] Furthermore, the carbon monoxide detector may have a built-in LED lighting lamp and directly control the on / off state of the lighting lamp. Figure 8 The control of an 11W constant current source LED lighting is shown. Figure 8 In the figure, V1 refers to the voltage of AC36V after rectification and filtering, which can be seen in Fig.10 The electrical schematic diagram of the detector is shown. Pin2 (EN) of the YY2014 chip was originally connected to PIN8 (VDD), whose voltage level is 5.6V, that is, the light is on. In the embodiment of the present application, a certain I / O terminal of the detector MCU, such as P3.3, can be directly connected to the Pin2 (EN) foot. In this way, when the CO exceeds the standard, the lighting lamp can flash.

[0079] In addition, according to the RS485 communication protocol to exchange information, each detector must have an independent stack address. The detector of the present invention does not have a hardware circuit for setting the stack address, but stores the stack address in the EEPROM and reads it automatically each time it is powered on. When downloading the program, different stack addresses can be set for each detector, but other means must be available to facilitate user rewriting. Specifically, a PC program can be written, and a carrier communication module can be connected using a USB to TTL serial port. This carrier module and a detector are simultaneously connected to the AC36V line, so that the detector can be experimented and set. Of course, the detector program must have corresponding functions. The program of the host PC is written in languages ​​such as VB. In the laboratory or at home, an AC36V power supply can be obtained using a 220 / 36V transformer of several volt-amperes, and the circuit connection can use DuPont wires.

[0080] There is another method that is actually simpler, which is to install the detectors one by one in the mine room, and use the terminal touch screen to rewrite the stack address of each detector. Note that when developing terminal programs, software that supports this function must be available.

[0081] On the basis of the above, the embodiment of the present application also provides a carbon monoxide detector with temperature compensation. At present, there are more and more deep mines, some of which are more than 1,000 meters from the ground, and the temperature in the mine room is as high as more than 50 degrees, so the embodiment of the present application adds temperature detection in the detector. It should be noted that some manufacturers have temperature compensation in the sensor preamplifier circuit, which is usually composed of thermistors and the like. Each sensor manufacturer will also provide a curve relationship between the sensor output voltage and the ambient temperature. The present invention uses the temperature detection results to compensate the sensor output voltage in the software.

[0082] Embodiment 3:

[0083] Based on Example 1, Example 3 of the present application provides a more specific mining carrier communication carbon monoxide detector terminal, which is used to receive the detection data reported by the carbon monoxide detector and set the parameters of the carbon monoxide detector; the carbon monoxide detector terminal includes: a second inductive wave arrester, a second rectifier circuit, a third DC / DC converter, a second carrier communication module, and a second single-chip microcomputer.

[0084] Among them, Figure 5 As shown, one path of the AC36V power supply is directly connected to the second carrier communication module as a carrier communication channel; the other path passes through the second inductor wave arrester and the second rectifier circuit in sequence to obtain the second initial DC power supply, and the second initial DC power supply is converted into a second main DC power supply (such as a DC / DC 12V main power supply) through a third DC / DC converter; the second main DC power supply is used to supply the second carrier communication module.

[0085] The carbon monoxide detector terminal may also include a color LCD touch screen and a relay coil. The second carrier communication module, the color LCD touch screen and the relay coil are all powered by DC12V, and only the MCU and the TTL to RS232 circuit are powered by DC5V, and the current is less than 1mA.

[0086] Specifically, the embodiment of the present application uses the DMG80480T070_A5WTR 7-inch T5L_DGUS II color LCD touch screen produced by Beijing DWIN Technology Co., Ltd. with a resolution of 800×480. The T5L series ASIC is a single-chip dual-core ASIC IC designed by DWIN Technology for AIoT applications with low power consumption, high cost performance, and high integration of GUI and applications. Its main features include:

[0087] (1) Using 8051 core, 1T (single instruction cycle) high-speed operation, the highest main frequency is 250MHz.

[0088] (2) An independent CPU core (GUI CPU) runs the DGUS II system.

[0089] (3) A separate CPU core (OS CPU) runs the user 8051 code or the Devin OS system, which can save the user CPU in the application. In fact, we can realize the basic functions of the terminal by only using the LCD screen to load the wave module.

[0090] (4) 1Mbytes on-chip Flash and Devin encryption technology ensure code and data security and prevent copycats and clones.

[0091] (5) Oscillators and PLLs designed for a variety of inexpensive wide-range tuned impedance crystals, reducing crystal requirements and PCB design difficulty.

[0092] (6) 3.3V IO voltage, can adapt to various levels of 1.8 / 2.5 / 3.3.

[0093] (7) Support SD interface download and configuration, support SD card file reading and rewriting.

[0094] (8) Low power consumption, strong anti-interference ability, can work stably on double-sided PCB design, and easily pass EMC / EMI test.

[0095] The DGUS II LCD screen has an independent 8051 core, and can develop OSCPU 8051 programs by itself, that is, use Keil C51 for secondary development; NOR Flash database storage capacity is up to 160KWords, which is used to save user data or DWINOS program library files; built-in voice playback, you can freely program-control the playback of voice files. Through secondary development, event recording and storage can be realized, and tab browsing can be done on the LCD screen; of course, the setting and access interface of each CO detector can also be realized; the LCD has an uninterrupted calendar clock supported by a backup battery. The terminal MCU acts as a host to broadcast the current time to each detector regularly, and the detector MCU calibrates the calendar clock of the machine. The detector MCU has its own RTC, but no backup battery.

[0096] In addition, by Figure 5 It can also be known that the second single-chip microcomputer of the terminal should have at least two serial ports, one supporting carrier communication and the other supporting the LCD screen after TTL / RS232 conversion. The terminal is directly developed using the single-chip microcomputer, which greatly reduces the cost and size of the PLC system.

[0097] Fig.11 The electrical schematic diagram of the detector terminal. The Darlington driver ULN2001 has a built-in freewheeling diode, so the relay coil does not need a parallel diode. The P6 socket is connected to the MCU's serial port for simulation and program downloading, but does not occupy the serial port resources. Note that P1.7 (TXD_3) and P1.6 (RXD_3) are also serial ports. When initializing the program, pay attention to the pin selection of the serial port. It should be noted that Fig.11 The microcontroller P1.0 / P1.1 must be swapped using SFR settings.

[0098] Furthermore, the carbon monoxide detector terminal is also provided with an Ethernet port, and the carbon monoxide detector terminal uploads the detection data to the ground production scheduling room through the Ethernet port. Fig. 9 Schematic diagram for adding an Ethernet port to a carbon monoxide detection terminal.

[0099] It should be noted that this terminal uses a 5V level system, and some pins of the network port chip need to be converted to a level. Fig. 9It can be seen that the MCU is linked to the network port chip ENC28J60 through the SPI bus. However, the terminal of the present invention adopts the STC8H2K12U QFN20 single-chip microcomputer. When completing the existing tasks, it cannot provide a complete SPI interface, and two external interrupt inputs are required, and its pins are not enough. For this reason, STC8H2K16U, QF32 package can be selected. This chip can solve this problem. Of course, the MCU of the detector terminal can have a wider selection space. Not only STC single-chip microcomputers are available, but also single-chip microcomputers from other manufacturers can be selected, such as Atmel's AVR single-chip microcomputer, STM32 single-chip microcomputer, MSP430 single-chip microcomputer, etc.

Claims

1. A carrier communication carbon monoxide detector for mining, characterized in that: Used to report detection data to a mine-used carrier communication carbon monoxide detector terminal; the carbon monoxide detector is arranged in a mine room, and an AC36V lighting circuit is provided in the mine room; the carbon monoxide detector comprises: a lamp holder (1), a housing (2), a circuit board (3), a CO sensor (4) and a first carrier communication module (8); The lamp holder (1) is arranged at one end of the housing (2), and the lamp holder (1) is connected to the AC36V lighting circuit; the AC36V power supply supplies power to the circuit board (3) through the AC36V lighting circuit and the lamp holder (1); the circuit board (3) is provided with a first carrier communication module (8) and a DC / DC conversion module, and the circuit board (3) is connected to a CO sensor (4) mounted on the housing (2); the housing (2) is also provided with a temperature sensor (5), a two-color light emitting diode (6), and a buzzer (7); the temperature sensor (5), the two-color light emitting diode (6), and the buzzer (7) are all connected to the circuit board (3); the circuit board ( 3) is also provided with a first single-chip microcomputer; the first carrier communication module (8) adopts the RS485 protocol; the circuit board (3) is provided with a first inductor wave blocker and a first rectifier circuit; wherein one path of the AC36V power supply is directly connected to the first carrier communication module (8), and the other path passes through the first inductor wave blocker and the first rectifier circuit to obtain a first initial DC power supply; the first initial DC power supply is converted into a target DC power supply by a DC / DC conversion module, and the target DC power supply is used to supply the first carrier communication module (8), the CO sensor (4), the temperature sensor (5), the first single-chip microcomputer and the sound and light alarm circuit; the sound and light alarm circuit comprises a two-color light emitting diode (6) and a buzzer (7).

2. The carrier communication carbon monoxide detector for mining according to claim 1 is characterized in that: The first initial DC power supply is converted into a target DC power supply through a DC / DC conversion module, including: the initial DC power supply is converted into a first main DC power supply through a first DC / DC converter; the initial DC power supply is converted into a sensor alternating heating DC power supply through a second DC / DC converter.

3. The carrier communication carbon monoxide detector for mining according to claim 2 is characterized in that: When the CO concentration exceeds a preset threshold, the first single chip records the time and duration when the CO concentration exceeds the preset threshold, and saves the power-on and power-off times of the carbon monoxide detector.

4. A carrier communication carbon monoxide detector terminal for mining, characterized in that: Used to receive the detection data reported by any one of the carbon monoxide detectors of claims 1 to 3, and set parameters for the carbon monoxide detector; the carbon monoxide detector terminal comprises: a second inductive wave trap, a second rectifier circuit, a third DC / DC converter, a second carrier communication module, and a second single-chip microcomputer; Among them, one path of the AC36V power supply is directly connected to the second carrier communication module, and the other path passes through the second inductor wave resistor and the second rectifier circuit in sequence to obtain the second initial DC power supply, and the second initial DC power supply is converted into a second main DC power supply through the third DC / DC converter; the second main DC power supply is used to supply the second carrier communication module.

5. The mine carrier communication carbon monoxide detector terminal according to claim 4 is characterized in that: The carbon monoxide detector terminal is also provided with an Ethernet port, and the carbon monoxide detector terminal uploads the detection data to the ground production dispatching room through the Ethernet port.

6. A carrier communication carbon monoxide detection system for mining, characterized in that: include: A carbon monoxide detector terminal and at least one carbon monoxide detector; the carbon monoxide detector is any one of claims 1 to 3; The carbon monoxide detector terminal is communicatively connected to the at least one carbon monoxide detector.

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