CN2586887Y

CN2586887Y - Intelligent network control system for boiler

Info

Publication number: CN2586887Y
Application number: CN 02253322
Authority: CN
Inventors: 王关健; 李继兵
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-09-10
Filing date: 2002-09-10
Publication date: 2003-11-19
Anticipated expiration: 2012-09-10

Abstract

The utility model relates to an intelligent network control system for boilers, which comprises a superior control center, a display screen, an analog quantity data collecting module, a switching value data collecting module, and a control execution mechanism, wherein, the superior control center is composed of an industrial control computer, a remote network communication module and a telemonitoring operation system, and the display screen is connected with the industrial control computer by a bus. The utility model is characterized in that switching value data firstly passes through an isolating circuit, then is sent to the switching value data collecting module, and thirdly output to the bus, and finally comes to a serial port of the industrial control computer by the bus; bus signals are firstly converted into serial data by a 485 chip, then received by using two ordinary I/O ports of a single chip computer, thirdly converted into 8-bit data, and finally sent to a register; the ordinary data I/O ports of the single chip computer are used for outputting high-speed pulses with variable pulse widths, and the high-speed pulses with variable pulse widths are converted into slow changes of voltage to achieve the aim of controlling the angle of flow of thyristor. The utility model has the advantages of anti-interference, high safety, low cost, flexible control, etc. and can the running efficiency of boilers.

Description

A kind of boiler intelligent network control system

Technical field

The utility model relates to a kind of intelligent network control system of boiler operatiopn.

Background technology

At present, the improvement project of the installation of domestic new boiler and old boiler adopts the computer field control technology more.In traditional control technology, owing to generally adopt Programmable Logic Controller PLC and common PC computer, technology and quantity, the stability of system, the application of telecommunication network data transferring technique of data being gathered capacity, information processing capacity, performance element all have bigger restriction, even can't implement.In addition, because the external environment condition of boiler room is relatively poor, the electrical equipment of heavy-duty motor (water pump) disturbs bigger, and the switching value control signal of common computer output very easily is interfered and produces misoperation.

Summary of the invention

The utility model can be expanded the space of boiler control technology, realize image data, controlled quentity controlled variable data, demonstration amount data utilize internal bus system fast, transmit reliably and handle, the accuracy and the reliability of control have been increased, make the monitoring of the running status of boiler and control is true more and accurately, thereby improved the efficient of boiler operatiopn.

A kind of boiler intelligent network control system described in the utility model, it comprises by finishing on-the-spot real-time data acquisition, system status monitoring, the large screen display data transmit, the Classification Management synchronization monitoring of different boilers, the storage of historical summary, statistics, analysis and the Industry Control special-purpose computer that warning message is classified, analyzes, handled, telecommunication network communication module and remote monitoring operating system are formed higher level control centre; Comprise that also the digital simulation that is connected with described Industry Control special-purpose computer by the RS-485 bus shows giant-screen, Analog Data Acquistion Module, on-off value data acquisition module and control executing agency; Each road sensor and transmitter of being connected with Analog Data Acquistion Module 16 tunnel analog quantity inputs; Programmable Logic Controller in the control executing agency; It is characterized in that: described on-off value data acquisition module comprises that a parallel port extended chip, one be not with common single-chip microcomputer and one 485 bus conversion chip of communication port; Each input port of described parallel port extended chip all photoelectricity coupling circuit by separately connects separately division board buffer circuit, finishes the collection to the switching value signal of each collection point, and wherein the division board buffer circuit can be the relay buffer circuit; The output of described on-off value data acquisition module is received the serial ports of industrial control computer through bus, and described switch data amount is delivered in the industrial control computer; Described heat is gone in the mechanism, also comprise singlechip controller, this singlechip controller comprises and connects bus, and with bus signals be converted into the interface conversion circuit of serial data, two I/O mouths receive above-mentioned serial data, and convert 8 bit data to, and deliver to the controllable silicon of not controlled by described photoelectric coupled circuit output end that register is handled with the common single-chip microcomputer of communication port, the photoelectricity coupling circuit that is connected with the single-chip processor i/o delivery outlet and trigger end; Described single-chip data I/O output high-speed pulse, by the variation of control impuls width, the cushioning effect through optocoupler becomes the slow variation of voltage, comes Linear Control silicon controlled trigger voltage, thus output simulation controlled quentity controlled variable; The described single-chip processor i/o delivery outlet of controlling in the executing agency also can directly be exported the switching value control signal.

The utility model is compared with traditional control system, has following advantage;

1. can effectively eliminate interference, the particularly interference of water pump electromagnetic signal, for the control reliability of system, true and accuracy provide technical guarantee.

2. improved the job security of system, effectively prevented from the switching value to burn each module that connects on 485 buses, even burnt industrial control computer and make the whole system paralysis in case seal in 220V or 380V voltage.

3. characteristics such as to have a cost low for the performance element formed of single-chip microcomputer, and control flexibly and volume is little.

Description of drawings

Fig. 1 is a control system theory diagram of the present utility model.

Fig. 2 is the circuit theory diagrams of on-off value data acquisition module of the present utility model.

Fig. 3 is switching value input signal division board circuit theory diagrams of the present utility model.

Fig. 4 is the circuit theory diagrams of singlechip controller of the present utility model.

The specific embodiment

Physical circuit of the present utility model and operation principle can be referring to accompanying drawings.

Higher level control centre mainly comprises industrial computer, display, keyboard, mouse and printer.Industrial computer is the core of native system, it mainly finishes on-the-spot real-time data acquisition, system mode control, DATEL, the large screen display data transmit, the Classification Management synchronization monitoring of different boilers, the storage of historical summary, statistics, analyze for calling at any time or print, to alarm signal classify, functions such as analysis, processing, and can be the upgrading of system in the future and reserve bigger space.

Data acquisition, transmission: because the application of IPC is stronger, the image data capacity is multiplied, native system is made as 512 amounts, and dilatation at any time.The signal of telecommunication that data acquisition and data conversion are meant the real-time sampling of each point to whole boiler operational system, line, data and are converted to standard transmits.The state and the performance of system's operation that these are data represented is the foundation of field control and intelligent management.Have in the on-the-spot analogue data amount that needs to gather of boiler: the temperature of each point, pressure, discharge, steam flow, the switch data amount of each point has: combustor state, water level, pump work state and each monitoring point warning amount etc.To the processing of analog quantity, pass through A/D analog-to-digital conversion module RM416 earlier, deliver to 485 serial ports of IPC again through 485 data/address bus.For the switch data amount, then to deliver to division board earlier, deliver to switch acquisition conversion module (forming) again and export 485 buses to by IC28255A, IC1 single-chip microcomputer PIC16C57, deliver to IPC serial ports (see figure 2) through bus.The effect of division board buffer circuit (see figure 3) is that the switching value signal of each collection point is isolated with relay, the one, disturb (the particularly interference of water pump electromagnetic signal) in order effectively to eliminate, the 2nd, to burn each module on 485 buses in order effectively preventing on the switching value in case seal in 220V or 380V voltage, even to burn IPC and make the whole system paralysis.Though the circuit of division board is uncomplicated, effect is very effective in application.

Control output and executing agency: executing agency is that the information command with Computer Processing feeds back to the scene, and is different and adopt the PLC controller respectively and based on the executing agency of single-chip microcomputer, auxiliary reclay etc. at the field control object.The control object is respectively combustor, electric control valve, water pump, electromagnetic valve, warning and treatment facility, auxiliary reclay etc.Here the special performance element of forming with the PIC single-chip microcomputer of introducing is compared with the PLC controller, and it is low to have a cost, control flexibly, characteristics such as volume is little.The outstanding feature of this circuit is: not finish the communication function (also using this technology in Fig. 2 switching value transfer circuit) of 485 buses with the I/O mouth of the common single-chip microcomputer of port.Show as on hardware circuit: bus signals is converted into serial data earlier through 485 chips, receives and converts to 8 bit data with two passage I/O mouths of PIC16C54 single-chip microcomputer and deliver to register and handle.Technology is in addition: the general data I/O mouth with single-chip microcomputer comes Linear Control silicon controlled trigger voltage, thereby reach the governing speed of control electric control valve, its effect is fine, this point PLC controller all can't directly be accomplished, its basic principle is the pulse width variations of the high-speed pulse of single-chip microcomputer output, the cushioning effect of process optocoupler becomes the slow variation of voltage, reaches the purpose (see figure 4) of control thyristor operating angle.

Large screen display is communicated by letter with network remote: large screen display is the on-the-spot important feature of monitoring in real time of native system.The system diagram that shows because of general computer display is comparatively intensive, partial data needs Pagination Display, the variation of data is intuitively eye-catching inadequately, by the demonstration of giant-screen lifelike image, can make on-the-spot operator on duty easily grasp the running status of whole cooker furnace system at any time.All data of giant-screen all transmit by 485 buses, have avoided big the phenomenon of line.

Native system has designed the remote network communication function, all information content at scene can be sent to remote control unit, also can receive the control information that remote control unit sends.The all control informations and the transmission of data message are all finished by network service.Because data are in real time uninterrupted transmission, therefore require network should have reliable communication to guarantee, again communication cost with due regard to.Native system adopts telecommunications DPN special line scheme, and circuit and terminal device are provided by telecommunication bureau, and good reliability is easy to use, and it is lower to have hire charge, and long-term use can be significantly reduced to this.

Claims

1. boiler intelligent network control system, it comprises that Industry Control special-purpose computer, telecommunication network communication module and remote monitoring operating system forms higher level control centre; Comprise that also the digital simulation that is connected with described Industry Control special-purpose computer by the RS-485 bus shows giant-screen, Analog Data Acquistion Module, on-off value data acquisition module and control executing agency; Each road sensor and transmitter of being connected with Analog Data Acquistion Module 16 tunnel analog quantity inputs; The Programmable Logic Controller of control in the executing agency: it is characterized in that: described on-off value data acquisition module comprises that a parallel port extended chip, one be not with common single-chip microcomputer and one 485 bus conversion chip of communication port; Each input port of described parallel port extended chip all photoelectricity coupling circuit by separately connects separately division board buffer circuit, and wherein the division board buffer circuit can be the relay buffer circuit; The serial ports of industrial control computer is received in the output of described on-off value data acquisition module through bus, in the described executing agency, also comprise singlechip controller, this singlechip controller comprises the interface conversion circuit that connects bus and has two I/O ports and not with the common single-chip microcomputer of communication port; When described single-chip processor i/o delivery outlet is the output of the adjustable high-speed pulse of pulsewidth, its I/O delivery outlet is by photoelectricity coupling circuit wiring control silicon controlled trigger end, when the described single-chip processor i/o delivery outlet of controlling in the executing agency is switching value output, can directly be connected with switching value control terminal device.