CN202994711U - Gas measurement warning device based on singlechip - Google Patents

Abstract

The utility model discloses a gas measurement and alarm device based on a single-chip microcomputer, which comprises a main control unit module, a gas sampling module, a signal amplification and conversion module, a button module, a storage module, a display module, an alarm module and an execution module. After the gas sampling module collects the gas concentration signal in the air of the target area, it is converted into a digital signal that can be processed by the single-chip microcomputer MC9S12XS128 through the signal amplification and conversion module. Comparing the digital signal with the set alarm upper limit value, if the gas concentration exceeds the limit value, the single-chip microcomputer system controls the alarm device to alarm, and at the same time controls the execution module to start the motor to speed up the air flow and reduce the gas concentration. The device has the advantages of small sensor drift, long maintenance period, simple maintenance method, strong resistance to mechanical interference, good reliability, and low cost.

Description

A Gas Measuring and Alarming Device Based on SCM

technical field

The utility model relates to the field of computer applications, in particular to a measuring device, in particular to a single-chip microcomputer-based gas measuring and alarming device used in coal mines.

Background technique

It can be seen from the current situation of my country's coal production and the strategic planning of my country's energy structure that coal is the main energy that supports the development of my country's national economy. As the pillar of my country's energy industry, coal production will be long-term and stable. However, the current safety production status of the coal industry is very poor, one of which is the harmfulness of harmful gases, including CH14, SO, SO2 and so on. Gas (CH14) is the most harmful gas in coal mines. It is a gas formed during coal formation and stored in large quantities in coal seams. It is colorless, odorless, flammable, and explosive.

At present, the gas alarm miner's lamps that have been used in our country have the advantages of small size, simple structure, and convenient installation. Poor mechanical interference capability.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the purpose of this utility model is to propose a gas measurement and alarm device based on a single-chip microcomputer.

In order to realize above-mentioned task, technical scheme of the present utility model is realized like this:

A gas measurement and alarm device based on a single-chip microcomputer, characterized in that it includes a main control unit, a gas sampling module, a signal amplification and conversion module, a key module, a storage module, a display module, an alarm module and an execution module, wherein the signal amplification and conversion The module is connected to the output end of the gas sampling module, and the button module, storage module, display module, alarm module and execution module are respectively connected to the main control unit.

Other features of the utility model are:

The main control unit adopts 16-bit MC9S12XS128 microcontroller produced by Freescale.

The gas sampling module uses a resistive semiconductor gas sensor.

The display module adopts LED5110 display screen.

The execution module is composed of a photocoupler MOC3041, a thyristor SCR and a motor.

The gas measurement and alarm device based on the single-chip microcomputer of the utility model detects the content of the gas concentration in the air by detecting the voltage value at both ends of the gas sensor in the gas sampling module, and the signal amplification and conversion module converts the gas concentration analog signal detected by the gas sampling module. Amplification and analog-to-digital conversion into digital signals that MC9S12XS128 can handle. The gas concentration alarm upper limit is set through the button module, and the main control unit module stores the alarm upper limit value in AT24C02 to prevent data loss after power failure and affect the normal operation of the device. The main control unit module compares the digital signal with the set upper limit value and displays the current gas concentration value on the LED5110 display screen. If the gas concentration exceeds the alarm upper limit value, the main control unit module controls the buzzer in the alarm module Work with the red flashing light, and at the same time, the main control unit module controls the control valve circuit of the execution module to work to speed up the air flow and reduce the gas concentration.

Description of drawings

Fig. 1 is a schematic block diagram of a gas measurement and alarm device based on a single-chip microcomputer of the present invention.

Fig. 2 is a connection circuit diagram of the gas sampling module and the signal amplification and conversion module.

Figure 3 is a circuit diagram of the button module.

Fig. 4 is a connection circuit diagram of the display module and the storage module.

Figure 5 is a connection circuit diagram of the alarm module.

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

Detailed ways

As shown in Figure 1, this embodiment provides a schematic block diagram of a gas measurement and alarm device based on a single-chip microcomputer, including a main control unit 1, a gas sampling module 2, a signal amplification and conversion module 3, a button module 4, a storage module 5, and a display Module 6, alarm module 7 and execution module 8. Among them, the gas sampling module 2 is connected to the output end of the main control unit 1 through the signal amplification and conversion module 3, and the key module 4, storage module 5, display module 6, alarm module 7, and execution module 8 are respectively connected to the main control unit 1.

In this embodiment, the main control unit 1 is a 16-bit MC9S12XS128 microcontroller produced by Freescale. MC9S12XS128 MCU is powered by 5V, the chip contains 128K Flash memory, 8K RAM, 8K EEPROM, two serial communication interfaces, one serial peripheral interface, eight timer channels, two eight-channel A with adjustable conversion precision /D port, 8-way PWM output, 1-way internal counter, etc. The main frequency of the chip can be over-adjusted to 80 to 96MHz. The main control unit module receives the signal transmitted by the signal amplification and conversion module, compares the transmitted signal with the set alarm limit value, and controls the action of the corresponding module.

The gas sampling module 2 uses a resistive semiconductor gas sensor as a detection element. This sensor has high detection sensitivity for flammable gases within the explosion range, is less affected by background gas, humidity, and air pressure, has a large output signal, low cost, and is easy to maintain. features. Resistive semiconductor gas sensors use metal oxide ceramic gas sensitive materials. Since the resistance value of the resistive semiconductor gas sensor is different under different gas concentrations, the gas sampling module 2 detects the current gas content in the air by detecting the voltage value at both ends of the resistive semiconductor gas sensor, and the detected gas concentration will be The analog quantity is transmitted to the signal amplification and conversion module 3 .

Figure 3 is a connection circuit diagram of the button module, through which the upper limit value of the alarm can be modified and the working state of the main control unit module can be set. After the main control unit module 1 accepts the upper limit value set by the button, the alarm limit value is stored in the AT24C02 storage chip.

The display module 6 adopts an LED5110 display screen, which is used to display information such as the upper limit value of the alarm, the current system time, and the working status. Figure 4 is a connection circuit diagram of the display module and the storage module.

The alarm module 7 includes a buzzer alarm and a red flashing light. When the detected gas concentration exceeds the set alarm upper limit, the main control unit module controls the alarm module to work, and the buzzer alarm alarms while the flashing light flashes. The connection circuit diagram of the alarm module is shown in Figure 5.

The execution module 8 adopts a real-time control method, including a photocoupler MOC3041, a silicon controlled rectifier SCR and a motor. The optocoupler MOC3041 separates the single-chip microcomputer system of the main control unit module from the thyristor SCR circuit, so as to avoid the interference signal affecting the operation of the single-chip microcomputer during the high-voltage process. The SCR can turn the motor on or off under the control of the motor.

The specific working process of the gas measurement and alarm device based on the single-chip microcomputer is that the MC9S12XS128 program in the main control unit module is initialized after starting up, and the alarm limit value saved in the memory is extracted. After the initialization is completed, the device starts to work, and the gas sampling module collects the target in real time. The content of gas concentration in the regional air, the detected gas concentration analog signal is transmitted to the signal amplification and conversion module, after amplification and conversion, the gas concentration analog signal is converted into a digital signal that can be processed by a single chip, and the detected gas concentration value is It is displayed on the LED5110 display screen, and the digital signal is compared with the alarm limit value at the same time. If the detected gas concentration exceeds the alarm upper limit value, the single-chip microcomputer MC9S12XS128 controls the buzzer alarm and the red flashing light flashes. At the same time, the single-chip microcomputer system controls the SCR action of the executive module, turns on the motor, speeds up the air convection, and reduces the gas concentration.

The gas measurement and alarm device based on the single-chip microcomputer of the utility model utilizes the intelligent control technology of the single-chip microcomputer, uses the MC9S12XS128 single-chip microcomputer as the control device, converts the gas signal into an electrical signal through a gas sensitive resistor and an amplifier, and then converts it into a digital signal by an ADC0809. The device has the advantages of small sensor drift, long maintenance period, simple maintenance method, strong resistance to mechanical interference, good reliability, and low cost.

Claims (5)

1. SCM Based gas surveying warning device, it is characterized in that, comprise that main control unit (1), gas sampling module (2), signal amplify and modular converter (3), key-press module (4), storage module (5), display module (6), alarm module (7) and execution module (8); Wherein, gas sampling module (2) is amplified the output terminal that is connected to main control unit (1) with modular converter (3) by signal, key-press module (4), storage module (5), display module (6), alarm module (7) and execution module (8) are connected with main control unit (1) respectively.

2. SCM Based gas surveying warning device as claimed in claim 1, is characterized in that, described main control unit module (1) adopts the MC9S12XS128 single-chip microcomputer.

3. SCM Based gas surveying warning device as claimed in claim 1, is characterized in that, described gas sampling module (2) adopts the resistance-type semiconductor gas sensor.

4. SCM Based gas surveying warning device as claimed in claim 1, is characterized in that, described display module (6) adopts the LED5110 display screen.

5. a kind of SCM Based gas surveying warning device as claimed in claim 1, is characterized in that, described execution module (7) is comprised of photoelectrical coupler MOC3041, controllable silicon SCR and motor.

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