CN216901367U - Coal pulverizer temperature monitoring system based on Modbus communication - Google Patents

Abstract

The utility model relates to a coal mill temperature monitoring system based on Modbus communication, which comprises a temperature sensor arranged at an outlet of a coal mill, wherein the temperature sensor is in communication connection with an upper computer through a signal acquisition device based on a Modbus communication protocol, the signal acquisition device comprises an analog circuit unit and a digital circuit unit which are sequentially connected, the analog circuit unit is connected with the temperature sensor, and the digital circuit unit is connected with the upper computer. Compared with the prior art, the utility model can reliably and accurately monitor the temperature signal at the outlet of the coal mill, realize the remote temperature signal acquisition and transmission and simultaneously ensure the reliability and the accuracy of the signal transmission.

Description

Coal pulverizer temperature monitoring system based on Modbus communication

Technical Field

The utility model relates to the technical field of coal mill data acquisition, in particular to a coal mill temperature monitoring system based on Modbus communication.

Background

In a thermal power plant, a coal mill is a machine for crushing and grinding coal briquettes into coal powder, and is an important auxiliary device of a coal powder furnace. The coal mill has a complex structure, equipment is prone to failure after long-term use, passive manual maintenance is needed, pertinence and economical efficiency in the maintenance process are low, the maintenance process is backward, the service life of the equipment cannot be effectively prolonged, and maintenance cost is high.

In order to improve the service life and the economic benefit of the coal mill, the drying output of the coal mill is reduced and coal is easily blocked due to the fact that the outlet temperature of the coal mill is too low, and the increase of system resistance is influenced due to the fact that pulverized coal is bonded by an air-pulverized duct; and if the outlet temperature of the coal mill is too high, the explosion of the coal pulverizing system is easily caused. In addition, many of the existing medium-speed coal pulverizing systems do not have a heat preservation function, the heat dissipation loss is increased, and the accidents of burning personnel are easy to happen, so that the outlet temperature of the coal mill needs to be reliably monitored.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide a coal mill temperature monitoring system based on Modbus communication, so as to reliably and accurately monitor a coal mill outlet temperature signal.

The purpose of the utility model can be realized by the following technical scheme: the utility model provides a coal pulverizer temperature monitoring system based on Modbus communication, is including installing in the temperature sensor of coal pulverizer export position, temperature sensor is through signal acquisition device and host computer communication connection based on Modbus communication protocol, signal acquisition device is including the analog circuit unit and the digital circuit unit that connect gradually, the analog circuit unit is connected with temperature sensor, the digital circuit unit and host computer connection.

Furthermore, the analog circuit unit comprises a signal amplification module, a low-pass filtering module and a voltage raising module which are connected in sequence.

Further, the digital circuit unit includes STM32F1 type microprocessor, CAN controller, CAN transceiver module and RS485 interface chip, STM32F1 type microprocessor is connected with analog circuit unit, CAN controller respectively, the CAN controller is connected with CAN transceiver module, RS485 interface chip respectively, RS485 interface chip passes through Modbus communication protocol and is connected to the host computer.

Furthermore, the CAN controller comprises a first CAN control module used for sending CAN form data and a second CAN control module used for receiving the CAN form data, the first CAN control module is connected with the second CAN control module through a CAN receiving and sending module, and the second CAN control module is connected with an RS485 interface chip.

Further, the temperature sensor is a WRN2-430 type thermocouple.

Further, the signal amplification module is specifically an LF155 operational amplifier.

Further, the low-pass filtering module is specifically a USBUF02W6 filter.

Further, the voltage raising module is specifically an XL6008 converter.

Further, the first CAN control module and the second CAN control module are both DSP2407 chips.

Further, the CAN transceiver module is specifically a JTA1050 chip.

Compared with the prior art, the temperature sensor, the signal acquisition device based on the Modbus communication protocol and the upper computer are sequentially connected, the temperature sensor is used for detecting the temperature signal at the outlet of the coal mill in real time, the signal acquisition device based on the Modbus communication protocol is used for processing the temperature signal and transmitting the temperature signal to the upper computer, so that the upper computer can remotely acquire the temperature signal of the coal mill acquired in real time.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein: 1. the device comprises a temperature sensor, a signal acquisition device, a 3 upper computer, a 21 analog circuit unit, a 22 digital circuit unit, a 210 signal amplification module, a 211 low-pass filtering module, a 212 voltage lifting module, a 220 STM32F1 type microprocessor, a 221 CAN controller, a 222 CAN transceiver module, a 223 RS485 interface chip.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments.

Example (b):

as shown in fig. 1, a coal mill temperature monitoring system based on Modbus communication includes a temperature sensor 1 installed at an outlet of a coal mill, in this embodiment, a WRN2-430 type thermocouple is selected as the temperature sensor 1 to collect a coal mill outlet temperature signal in real time, the temperature sensor 1 is in communication connection with an upper computer 3 through a signal acquisition device 2 based on a Modbus communication protocol, the signal acquisition device 2 includes an analog circuit unit 21 and a digital circuit unit 22 which are connected in sequence, the analog circuit unit 21 is connected with the temperature sensor 1, and the digital circuit unit 22 is connected with the upper computer 3.

The analog circuit unit 21 includes a signal amplification module 210, a low-pass filtering module 211, and a voltage boosting module 212, which are connected in sequence, in this embodiment, the signal amplification module 210 selects the LF155 to amplify the amplitude of the acquired temperature analog signal, so as to facilitate signal processing of subsequent circuits;

the low-pass filtering module 211 selects USBUF02W6 to filter noise signals;

the voltage boost module 212 selects XL6008 to maintain the input signal voltage of the digital circuit unit 22 within the voltage range required for AD conversion in the digital circuit;

the digital circuit unit 22 comprises an STM32F1 type microprocessor 220, a CAN controller 221, a CAN transceiver module 222 and an RS485 interface chip 223, the STM32F1 type microprocessor 220 is respectively connected with the analog circuit unit 21 and the CAN controller 221, the CAN controller 221 is respectively connected with the CAN transceiver module 222 and the RS485 interface chip 223, the RS485 interface chip 223 is connected to the upper computer 3 through a Modbus communication protocol, concretely, the CAN controller 221 comprises a first CAN control module for sending CAN form data and a second CAN control module for receiving CAN form data, the first CAN control module is connected with the second CAN control module through the CAN transceiver module, and the second CAN control module is connected with the RS485 interface chip;

in this embodiment, the first CAN control module and the second CAN control module are both DSP2407 chips, and CAN send or receive data to/from the electrical signal in the protocol format of the CAN;

the CAN transceiver module 222 selects JTA1050 chip to transmit CAN form electric signal;

the STM32F1 type microprocessor 220 is specifically an STM32F103C8T6, and is used for performing AD conversion on the processed analog signals and controlling communication with an upper computer;

the model of the RS485 interface chip 223 is MAX3485 specifically, an RS485 communication network between the signal acquisition device 2 and the upper computer 3 is built, and a Modbus communication protocol is adopted between the upper computer 3 and the RS485 interface chip 223.

In practical application, the analog circuit unit in the signal acquisition device is used for conditioning the temperature analog signal output by the temperature sensor: firstly, a temperature analog signal output from a temperature sensor passes through a signal amplification module to amplify the signal, so that signal processing and sampling of a circuit behind the temperature analog signal are facilitated; then filtering out signals with frequency higher than the required frequency through a low-pass filtering module; finally, the voltage of the input signal is stabilized within a voltage range required by the digital circuit during AD conversion through the voltage lifting module;

the digital circuit unit comprises a CAN controller, a CAN transceiving module, an STM32F1 type microprocessor and an RS485 interface chip: firstly, the STM32F1 type microprocessor converts the transmitted signal into a digital signal through AD, and sends the digital signal to a CAN controller, the CAN controller sends the electric signal in a CAN protocol format, then a CAN transceiver module sends the signal to another CAN controller, at the moment, the CAN controller CAN control to select to receive or reject, if the signal is received, the received signal is sent to an RS485 interface chip, the RS485 interface chip is responsible for transmitting the signal to an RS485 communication network, the data signal is transmitted through a Modbus protocol, and an upper computer receives and displays the transmitted digital signal, so that the monitoring of the temperature signal of the coal mill is completed.

In summary, the coal mill temperature signal monitoring system based on the Modbus communication protocol can acquire the temperature signal at the outlet of the coal mill, and has the advantages of openness, expandability, low price and stable communication signal; the method also has the characteristics of long communication distance and high compatibility; the functions of off-line signal acquisition, storage and on-line data analysis can be realized, reliable real-time data are provided for real-time monitoring and fault early warning of the coal mill, and the historical data stored by the upper computer can also provide reliable guarantee for subsequent overhaul, operation and maintenance and the like.

Claims (8)

1. The coal mill temperature monitoring system based on Modbus communication is characterized by comprising a temperature sensor (1) installed at an outlet position of a coal mill, wherein the temperature sensor (1) is in communication connection with an upper computer (3) through a signal acquisition device (2) based on a Modbus communication protocol, the signal acquisition device (2) comprises an analog circuit unit (21) and a digital circuit unit (22) which are sequentially connected, the analog circuit unit (21) is connected with the temperature sensor (1), and the digital circuit unit (22) is connected with the upper computer (3);

the digital circuit unit (22) comprises an STM32F1 type microprocessor (220), a CAN controller (221), a CAN transceiver module (222) and an RS485 interface chip (223), the STM32F1 type microprocessor (220) is respectively connected with the analog circuit unit (21) and the CAN controller (221), the CAN controller (221) is respectively connected with the CAN transceiver module (222) and the RS485 interface chip (223), and the RS485 interface chip (223) is connected to the upper computer (3) through a Modbus communication protocol;

the CAN controller (221) comprises a first CAN control module used for sending CAN form data and a second CAN control module used for receiving the CAN form data, the first CAN control module is connected with the second CAN control module through a CAN receiving and sending module (222), and the second CAN control module is connected with an RS485 interface chip (223).

2. The coal pulverizer temperature monitoring system based on Modbus communication of claim 1, wherein the analog circuit unit (21) comprises a signal amplification module (210), a low pass filter module (211) and a voltage rise module (212) which are connected in sequence.

3. The Modbus communication-based coal mill temperature monitoring system according to any one of claims 1-2, wherein the temperature sensor (1) is a WRN2-430 thermocouple.

4. The Modbus communication-based coal mill temperature monitoring system according to claim 2, wherein the signal amplification module (210) is specifically an LF155 operational amplifier.

5. The Modbus communication-based coal mill temperature monitoring system according to claim 2, wherein the low-pass filtering module (211) is specifically a USBUF02W6 filter.

6. The Modbus communication-based coal mill temperature monitoring system according to claim 2, wherein the voltage raising module (212) is specifically an XL6008 converter.

7. The coal mill temperature monitoring system based on Modbus communication of claim 1, wherein the first CAN control module and the second CAN control module are both DSP2407 chips.

8. The Modbus communication-based coal mill temperature monitoring system as claimed in claim 1, wherein the CAN transceiver module (222) is specifically JTA1050 chip.

Images