CN103203276A - A control method and a system for a scraper coal feeder - Google Patents
A control method and a system for a scraper coal feeder Download PDFInfo
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- CN103203276A CN103203276A CN2012100107207A CN201210010720A CN103203276A CN 103203276 A CN103203276 A CN 103203276A CN 2012100107207 A CN2012100107207 A CN 2012100107207A CN 201210010720 A CN201210010720 A CN 201210010720A CN 103203276 A CN103203276 A CN 103203276A
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Abstract
The present invention discloses a control method and a control system for a scraper coal feeder. The method comprises the steps of: a current transformer mounted on a power supply of the motor of the scraper coal feeder switches a power supply current and outputs a secondary current to a current transmitter; the current transmitter outputs a 4-20mA current signal to a DCS system after receiving the secondary current; and if the current signal received by the DCS system is less than 12mA, an instruction of automatically starting a vibrator is issued. The method and the system may make a pre-judgment before the coal in the scraper coal feeder is about to be cut off, and issues an order of starting the rapper.
Description
Technical field
The present invention relates to technical field, particularly a kind of control method of scraper plate feeder and system.
Background technology
Power plant's run coal bin coal dropping port often stops up serious, and the disconnected coal of scraper plate feeder is frequent, the pulverized coal preparation system decrease in efficiency, and boiler temperature control difficulty is big, influences unit output, and the steel ball consumption is also very big.When observing coal dropping port not during coal breakage, just need on-the-spot employee to beat hopper immediately and make it unobstructed.
And to prejudge the coal that whether breaks, and because feeder does not design the visual observation hole, then needing the cover plate at feeder two ends is opened, the coal dust of feeder inside is unrestrained to whole more than ten meters floor, and is extremely abominable to ambient influnence.
Therefore, be badly in need of a kind of method that can prejudge the coal that whether break in the scraper plate feeder automatically, to increase work efficiency.
Summary of the invention
The invention provides a kind of control method and system of scraper plate feeder, can in the scraper plate feeder, be about to make judgement in advance before the disconnected coal, send the order that starts vibrator.
Technical scheme of the present invention is:
A kind of control method of scraper plate feeder comprises step:
A, be installed in to the current transformer on the dynamo-electric source of described scraper plate coal and receive source current, and the output secondary current is to current transducer;
After B, current transducer receive described secondary current, export the 4-20mA current signal to the DCS system;
C, when receiving current signal less than 12mA in the DCS system, send the order of automatic startup vibrator.
Preferably, in described step C, the described current signal that the DCS system receives for the first time is during less than 12mA, the order that delay time section T1 sends automatic startup vibrator;
Repeating step A, B again in time period T1, the described current signal that the DCS system receives in time period T1 be during less than 12mA, the order of sending automatic startup vibrator.
Preferably, in described step C, the current signal that the DCS system receives for the first time is during less than 12mA, the order that delay time section T1 sends automatic startup vibrator;
If the described secondary current that receives in time period T1 of DCS system during greater than 12mA, does not then send the order that starts vibrator.
Preferably, time period T1 is 10S.
Preferably, comprise also that the current signal that receives in the DCS system is during greater than 12mA, delay time section T2 sends the order that stops vibrator;
Repeating step A, B again in time period T2, the current signal that the DCS system receives in time period T2 send the order that stops vibrator during greater than 12mA.
Preferably, described primary current is 12-14A under normal condition, is 8-9A when breaking coal.
A kind of control system of scraper plate feeder comprises current transformer, current transducer, DCS system and vibrator;
Described current transformer is used for receiving the source current in the dynamo-electric source of described scraper plate coal, and exports secondary current to current transducer;
Described current transducer is used for receiving the described secondary current that described current transformer sends, and output 4-20mA current signal is to the DCS system;
Described DCS system is used at the current signal that receives during less than 12mA the order of sending automatic startup vibrator;
Described vibrator is used for beaing hopper.
Preferably, described DCS system also is used for during greater than 12mA, sending the order that stops vibrator at the current signal that receives.
Preferably, comprise that also the time arranges the unit, be used for arranging the T1 time period, the described T1 time period is the current signal that receives of described DCS system during less than 12mA, and the time period of automatic startup vibrator order is sent in time-delay;
The DCS system is used at the current signal that receives during less than 12mA the order that delay time section T1 sends automatic startup vibrator; When in time period T1, receiving the current signal less than 12mA again, the order of sending automatic startup vibrator.
Preferably, the described time arranges the unit, also is used for arranging the T2 time period, and the described T2 time period, during greater than 12mA, time-delay was sent the time period that stops the vibrator order for the current signal that receives in described DCS system;
The DCS system also is used at the current signal that receives during greater than 12mA, and delay time section T2 sends the order that stops vibrator; When in time period T2, receiving the current signal greater than 12mA again, send the order that stops vibrator.
The control method of scraper plate feeder provided by the invention and system have following advantage:
1, automatic degree height: this control method and system are by DCS (Distributed Control System, dcs) the 4-20mA current signal that system's automatic reception, detection convert from source current, need not manual intervention, reduce the personnel to operate and monitor;
2, judge accurately: primary current is 12-14A when normally descending coal, primary current is 8-9A when breaking coal, electric current changes unstable and causes the DCS system to judge and forbidden, the present invention judges that by the DCS system whether current signal judges whether to resolve the judgement of coal less than 12mA, the 12mA numerical standard obtains for inventor's multiple authentication, criterion is clear and definite, so the judged result error is little;
3, delayed startup is avoided maloperation: the DCS system can be when the current signal that for the first time receives less than 12mA, and the delayed startup vibrator is waited for secondary reception result; If still receive for the second time the current signal less than 12mA, then start vibrator, reduce error starting, avoid false judgment and bring unnecessary beaing.
The specific embodiment
Do further detailed description below in conjunction with the technical solution of the present invention of embodiment, but embodiments of the present invention are not limited thereto.
Embodiment 1
A kind of control method of scraper plate feeder comprises step:
A, be installed in to the current transformer on the dynamo-electric source of described scraper plate coal and receive source current, and the output secondary current is to current transducer;
Current transformer is 20/1 for the electric current no-load voltage ratio, and soon current strength is dwindled and sent; Primary current should be 12-14A under normal condition, be 8-9A when breaking coal.
After B, current transducer received described secondary current, the current signal of output 4-20mA was to the DCS system;
Current transducer receives 0～1A electric current, output be 4～20mA;
C, the current signal that receives in the DCS system be during less than 12mA, the order of sending automatic startup vibrator.
Primary current＜the 10A of equipment operation when cause is broken coal, this electric current by current transformer and current transducer output current signal then is＜12mA.
The scraper plate feeder control system corresponding with embodiment 1 step comprises current transformer, current transducer, DCS system and vibrator;
Current transformer is used for receiving the source current in the dynamo-electric source of described scraper plate coal, and exports secondary current to current transducer;
Current transducer is used for receiving the described secondary current that described current transformer sends, and output 4-20mA electric current is to the DCS system;
The DCS system is used at the current signal that receives during less than 12mA the order of sending automatic startup vibrator;
Vibrator beats hopper after being used for receiving the DCS system command.
Embodiment 2
A kind of control method of scraper plate feeder comprises step:
A, be installed in to the current transformer on the dynamo-electric source of described scraper plate coal and receive source current, and the output secondary current is to current transducer;
After B, current transducer received described secondary current, output 4-20mA current signal was to the DCS system;
C, the current signal that receives for the first time in the DCS system be during less than 12mA, the order that delay time section T1 sends automatic startup vibrator;
D, repeating step A, B, the current signal that the DCS system receives in time period T1 be during less than 12mA, the order of sending automatic startup vibrator;
E, vibrator start.
Repeating step A, B again in time period T1, the current signal that the DCS system receives for the second time be during less than 12mA, the order of sending automatic startup vibrator; If the current signal that receives for the second time of DCS system during greater than 12mA, does not then send the order that starts vibrator.
For example, when T1 is 10S, the current signal less than 12mA that the DCS system receives for the first time, the order that the 10S that then delays time sends automatic startup vibrator; Current transformer receives source current for the second time simultaneously, and export secondary current to current transducer for the second time, for the second time output current signal is to the DCS system for current transducer, and the current signal that the DCS system receives for the second time is during less than 12mA, the order of sending automatic startup vibrator; The current signal that the DCS system receives does not for the second time then send the order that starts vibrator during greater than 12mA; That is to say have the time of 10S to detect again, two times result just starts vibrator all less than 12mA, avoids maloperation.
The scraper plate feeder control system corresponding with embodiment 2 steps comprises current transformer, current transducer, DCS system and vibrator; The effect of current transformer, current transducer, vibrator is described with embodiment 1.
The DCS system is used at the described current signal that receives during less than 12mA, the order that delay time section T1 sends automatic startup vibrator, and the current signal that receives at time period T1 is during less than 12mA, the order of sending automatic startup vibrator;
Time arranges the unit, then is used for arranging the T1 time period, and the current signal that the described T1 time period receives for the DCS system is during less than 12mA, and the time period of the order of automatic startup vibrator is sent in time-delay.
The current signal that repeating step A, B again in time period T1, DCS system receive at time period T1 is during less than 12mA, the order of sending automatic startup vibrator; If the current signal that receives for the second time of DCS system during greater than 12mA, does not then send the order that starts vibrator.
Embodiment 3
A kind of control method of scraper plate feeder comprises step:
A, be installed in to the current transformer on the dynamo-electric source of described scraper plate coal and receive source current, and the output secondary current is to current transducer;
After B, current transducer received described secondary current, output 4-20mA current signal was to the DCS system;
C, the current signal that receives for the first time in the DCS system be during less than 12mA, the order that delay time section T1 sends automatic startup vibrator;
The current signal that D, DCS system receive in time period T1 is during less than 12mA, the order of sending automatic startup vibrator;
E, vibrator start;
F, repeating step A, B, the current signal that receives in the DCS system are during greater than 12mA, and delay time section T2 sends the order that stops vibrator;
G, repeating step A, B, the current signal that the DCS system receives in time period T2 send the order that stops vibrator during greater than 12mA.
H, vibrator stop.
To start the vibrator process similar with embodiment 2 step C, and the process that stops vibrator also can be carried out twice detection in certain time period, and when two times result during all greater than 12mA, the DCS system just sends the order that stops vibrator.
The scraper plate feeder control system corresponding with embodiment 3 steps comprises current transformer, current transducer, DCS system and vibrator; The effect of current transformer, current transducer, vibrator is described with embodiment 1.
The DCS system is used for after vibrator starts, and the described current signal that receives is during greater than 12mA, and delay time section T2 sends the order that stops vibrator, and the current signal that receives at time period T2 sends the order that stops vibrator during greater than 12mA;
Time arranges the unit, then is used for arranging the T2 time period, and the current signal that the described T2 time period receives for the DCS system is during greater than 12mA, and the time period of the order that stops vibrator being sent in time-delay.
More than control method and the system of a kind of scraper plate feeder that the embodiment of the invention is provided be described in detail, used specific case herein principle of the present invention and embodiment set forth, only be used for helping to understand core concept of the present invention; Should not be construed as limitation of the present invention.
Claims (10)
1. the control method of a scraper plate feeder is characterized in that, comprises step:
A, be installed in to the current transformer on the dynamo-electric source of described scraper plate coal and receive source current, and the output secondary current is to current transducer;
After B, current transducer receive described secondary current, export the 4-20mA current signal to the DCS system;
C, when receiving current signal less than 12mA in the DCS system, send the order of automatic startup vibrator.
2. the control method of a kind of scraper plate feeder according to claim 1 is characterized in that, in described step C, the described current signal that the DCS system receives for the first time is during less than 12mA, the order that delay time section T1 sends automatic startup vibrator;
Repeating step A, B again in time period T1, the described current signal that the DCS system receives in time period T1 be during less than 12mA, the order of sending automatic startup vibrator.
3. the control method of a kind of scraper plate feeder according to claim 1 is characterized in that, in described step C, the current signal that the DCS system receives for the first time is during less than 12mA, the order that delay time section T1 sends automatic startup vibrator;
If the described secondary current that receives in time period T1 of DCS system during greater than 12mA, does not then send the order that starts vibrator.
4. according to the control method of claim 2 or 3 described a kind of scraper plate feeders, it is characterized in that time period T1 is 10S.
5. the control method of a kind of scraper plate feeder according to claim 1 is characterized in that, also comprises, the current signal that receives in the DCS system is during greater than 12mA, and delay time section T2 sends the order that stops vibrator;
Repeating step A, B again in time period T2, the current signal that the DCS system receives in time period T2 send the order that stops vibrator during greater than 12mA.
6. according to the control method of each described a kind of scraper plate feeder of claim 1 to 3, it is characterized in that described primary current is 12-14A under normal condition, is 8-9A when breaking coal.
7. the control system of a scraper plate feeder is characterized in that, comprises current transformer, current transducer, DCS system and vibrator;
Described current transformer is used for receiving the source current in the dynamo-electric source of described scraper plate coal, and exports secondary current to current transducer;
Described current transducer is used for receiving the described secondary current that described current transformer sends, and output 4-20mA current signal is to the DCS system;
Described DCS system is used at the current signal that receives during less than 12mA the order of sending automatic startup vibrator;
Described vibrator is used for beaing hopper.
8. the control system of a kind of scraper plate feeder according to claim 7 is characterized in that, described DCS system also is used for during greater than 12mA, sending the order that stops vibrator at the current signal that receives.
9. the control system of a kind of scraper plate feeder according to claim 7, it is characterized in that, comprise that also the time arranges the unit, be used for arranging the T1 time period, the described T1 time period is the current signal that receives of described DCS system during less than 12mA, and the time period of automatic startup vibrator order is sent in time-delay;
The DCS system is used at the current signal that receives during less than 12mA the order that delay time section T1 sends automatic startup vibrator; When in time period T1, receiving the current signal less than 12mA again, the order of sending automatic startup vibrator.
10. the control system of a kind of scraper plate feeder according to claim 9, it is characterized in that, the described time arranges the unit, also be used for arranging the T2 time period, the described T2 time period, during greater than 12mA, time-delay was sent the time period that stops the vibrator order for the current signal that receives in described DCS system;
The DCS system also is used at the current signal that receives during greater than 12mA, and delay time section T2 sends the order that stops vibrator; When in time period T2, receiving the current signal greater than 12mA again, send the order that stops vibrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210010720.7A CN103203276B (en) | 2012-01-15 | 2012-01-15 | A control method and a system for a scraper coal feeder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210010720.7A CN103203276B (en) | 2012-01-15 | 2012-01-15 | A control method and a system for a scraper coal feeder |
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| CN103203276A true CN103203276A (en) | 2013-07-17 |
| CN103203276B CN103203276B (en) | 2017-03-22 |
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| CN201210010720.7A Active CN103203276B (en) | 2012-01-15 | 2012-01-15 | A control method and a system for a scraper coal feeder |
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Cited By (2)
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| CN104624355A (en) * | 2015-01-09 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Raw ore storage yard blanking control method |
| CN104971820A (en) * | 2015-07-17 | 2015-10-14 | 江苏大唐国际吕四港发电有限责任公司 | Coal pulverizing system using vibrators and control method of coal pulverizing system |
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| CN104971820B (en) * | 2015-07-17 | 2017-12-12 | 江苏大唐国际吕四港发电有限责任公司 | A kind of pulverized coal preparation system and its control method using vibrator |
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| CN103203276B (en) | 2017-03-22 |
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Address after: Sheng Tong Industrial Park No. 109 Venus Road 410200 in Hunan province Changsha District of Wangcheng City Applicant after: Suntown Technology Group Corporation Address before: Sheng Tong Industrial Park No. 109 Venus Road 410200 in Hunan province Changsha District of Wangcheng City Applicant before: Hunan Shengtong Technology Group Co., Ltd. |
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