CN108249164A - A kind of application method of vacuum control system - Google Patents

A kind of application method of vacuum control system Download PDF

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Publication number
CN108249164A
CN108249164A CN201611250314.2A CN201611250314A CN108249164A CN 108249164 A CN108249164 A CN 108249164A CN 201611250314 A CN201611250314 A CN 201611250314A CN 108249164 A CN108249164 A CN 108249164A
Authority
CN
China
Prior art keywords
frequency conversion
conversion fan
valve
vacuum control
control system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611250314.2A
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Chinese (zh)
Inventor
尹中尉
罗军
范从军
陈实
陈文先
戴中文
金世益
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Tobacco Guizhou Industrial Co Ltd
Original Assignee
China Tobacco Guizhou Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Tobacco Guizhou Industrial Co Ltd filed Critical China Tobacco Guizhou Industrial Co Ltd
Priority to CN201611250314.2A priority Critical patent/CN108249164A/en
Publication of CN108249164A publication Critical patent/CN108249164A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34Details
    • B65G53/66Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2203/00Indexing code relating to control or detection of the articles or the load carriers during conveying
    • B65G2203/02Control or detection
    • B65G2203/0208Control or detection relating to the transported articles
    • B65G2203/025Speed of the article

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

The invention discloses a kind of application methods of vacuum control system, including vacuum control system and its application method, wherein, vacuum control system includes B/P EGR Back Pressure Transducer EGR, air-valve, wind valve controller, frequency conversion fan and controller, wherein, B/P EGR Back Pressure Transducer EGR is used to detect the negative pressure value in blast system pipeline;Air-valve is arranged in pipeline, plays the role of throttling, and wind valve controller is used for the aperture of adjusting air valve;Frequency conversion fan is set to pipeline one end, for forming negative pressure in pipeline;The signal input part of controller is connect with B/P EGR Back Pressure Transducer EGR, and signal output end is connect respectively with frequency conversion fan and wind valve controller;By above-mentioned vacuum control system, the negative pressure in system can be made to be consistent substantially, so as to the consistency of product quality, shorten the working time of wind turbine in high frequency, extend the service life of wind turbine, reduce energy consumption.

Description

A kind of application method of vacuum control system
Technical field
The present invention relates to cigarette production equipment technical field, more particularly to a kind of application method of vacuum control system.
Background technology
At present, the mode of the conveying generally use wind model of stem, using wind-force in stem stalk label, wet mass etc. it is miscellaneous Object is rejected.
In the prior art, stem blast system by manually sending negative pressure to be adjusted wind by rule of thumb, with usage time Increase, the dust-removal cloth-bag in blast system gradually blocks, and the negative pressure in blast system is gradually reduced, and causes stem batch Interior selection by winnowing difference on effect caused by between batch, the homogeneity of stem processing cannot be guaranteed, the feelings of feed blocking in pipeline Condition happens occasionally, no matter and production requirement size, dedusting fan will operate in maximum frequency values always, not only influence to use Service life, and energy consumption can be caused.
Therefore, how to improve stem blast system, the negative pressure in it is made to be consistent substantially, improve the consistent of product quality Property, energy consumption is reduced, extends the service life of equipment, becomes those skilled in the art's important technological problems urgently to be resolved hurrily.
Invention content
In view of this, the present invention provides a kind of application method of vacuum control system, to reach the negative pressure base made in it Originally it is consistent, improves the consistency of product quality, reduce energy consumption, extend the purpose of the service life of equipment.
To achieve the above object, the present invention provides following technical solution:
A kind of application method of vacuum control system, including vacuum control system, the vacuum control system includes:
For detecting the B/P EGR Back Pressure Transducer EGR of the negative pressure value in pipeline;
The air-valve being arranged in the pipeline and the wind valve controller for adjusting the valve area;
It is set to the frequency conversion fan of described pipeline one end;
Controller, the signal input part of the controller are connect with the B/P EGR Back Pressure Transducer EGR, signal output end respectively with institute State frequency conversion fan and wind valve controller connection;
The application method includes step:
1) negative pressure value in pipeline is detected, and detected value and negative pressure preset value are compared, if detected value is less than negative pressure 2) preset value then enters step, if detected value is more than negative pressure preset value, enter step 4);
2) preferentially increase the aperture of air-valve, if valve area has reached aperture preset value, improve the work of frequency conversion fan Frequency;
3) when the working frequency of frequency conversion fan is increased to predetermined frequency value, output alarm signal;
4) working frequency of frequency conversion fan is preferentially reduced, if the working frequency of frequency conversion fan is reduced to minimum value, is reduced The aperture of air-valve.
Preferably, the frequency conversion fan is centrifugal blower.
Preferably, the frequency conversion fan is provided with more, is connected in parallel on one end of the pipeline.
Preferably, the aperture of the air-valve is not less than 15 °.
Preferably, in the step 2), if valve area reaches 90%, the working frequency of frequency conversion fan is improved.
Preferably, in the step 3), when the working frequency of frequency conversion fan is increased to 90%, output alarm signal.
It can be seen from the above technical proposal that the application method of vacuum control system provided by the invention, including negative pressure control System processed, vacuum control system include B/P EGR Back Pressure Transducer EGR, air-valve, wind valve controller, frequency conversion fan and controller, wherein, it bears Pressure sensor is used to detect the negative pressure value in blast system pipeline;Air-valve is arranged in pipeline, plays the role of throttling, air-valve control Device processed is used for the aperture of adjusting air valve;Frequency conversion fan is set to pipeline one end, for forming negative pressure in pipeline;The letter of controller Number input terminal is connect with B/P EGR Back Pressure Transducer EGR, and signal output end is connect respectively with frequency conversion fan and wind valve controller;
The application method of above-mentioned vacuum control system is further included, including step:1) negative pressure value in pipeline is detected, and will inspection Measured value is compared with preset value, if detected value is less than preset value, is entered step 2), if detected value is more than preset value, into Enter step 4);2) preferentially increase the aperture of air-valve, if valve area has reached preset value, improve the work frequency of frequency conversion fan Rate;3) when the working frequency of frequency conversion fan is increased to preset value, output alarm signal;4) work of frequency conversion fan is preferentially reduced Frequency if the working frequency of frequency conversion fan is reduced to minimum value, reduces the aperture of air-valve;
In use, when preset value is not achieved in negative pressure, preferentially increased in pipeline by the aperture of adjusting air valve Negative pressure, only when the aperture of air-valve reaches higher value or limiting value, just by increase the working frequency of frequency conversion fan come Adjust negative pressure;It is corresponding, if negative pressure is more than preset value, the preferential working frequency for reducing frequency conversion fan, in frequency conversion fan Working frequency reduce to a certain extent when, just throttled to adjust the negative pressure of pipeline, above-mentioned tune by adjusting air valve aperture Section mode is provided to that the run time of frequency conversion fan in high frequency can be reduced, to extend the service life of frequency conversion fan, drop Low energy consumption and discharge;When the aperture of air-valve reaches higher value or limiting value, while the frequency of frequency conversion fan has also reached higher It is worth, the negative pressure in pipeline is still not achieved or reaches preset value reluctantly, then illustrates that the dust-extraction unit in system has occurred seriously It blocks, needs to replace immediately, at this moment controller output alarm signal, staff is prompted to replace dust-extraction unit;
By the application method of above-mentioned vacuum control system, the negative pressure in system can be made to be consistent substantially, so as to The consistency of product quality shortens the working time of wind turbine in high frequency, extends the service life of wind turbine, reduces energy consumption.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structure diagram of vacuum control system provided in an embodiment of the present invention;
Fig. 2 is the flow chart of the application method of vacuum control system provided in an embodiment of the present invention.
Specific embodiment
The present invention provides a kind of application methods of vacuum control system, the negative pressure in it are made to keep one substantially to reach It causes, improves the consistency of product quality, reduce energy consumption, extend the purpose of the service life of equipment.
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is the structure diagram of vacuum control system provided in an embodiment of the present invention.
The application method of a kind of vacuum control system provided in an embodiment of the present invention, including vacuum control system, negative pressure control System processed includes B/P EGR Back Pressure Transducer EGR 1, air-valve 3, wind valve controller 4, frequency conversion fan 5 and controller 6.
Wherein, B/P EGR Back Pressure Transducer EGR 1 is used to detect the negative pressure value in blast system pipeline 2;Air-valve 3 is arranged in pipeline 2, is risen To the effect of throttling, wind valve controller 4 is used for the aperture of adjusting air valve 3;Frequency conversion fan 5 is set to 2 one end of pipeline, in pipe Negative pressure is formed in road 2, pipeline 2 is connected between feeder 8 and frequency conversion fan 5, and feeder 8 is used to stem being delivered to conveyer belt 7;The signal input part of controller 6 is connect with B/P EGR Back Pressure Transducer EGR 1, and signal output end controls respectively with frequency conversion fan 5 and air-valve Device 4 connects.
The application method of above-mentioned vacuum control system is further included, referring to Fig. 2, Fig. 2 is provided in an embodiment of the present invention negative The flow chart of the application method of pressure control system, including step:
S1:The negative pressure value in pipeline 2 is detected, and detected value and preset value are compared, if detected value is less than preset value, S2 is then entered step, if detected value is more than preset value, enters step S4;
S2:The preferential aperture for increasing air-valve 3, if 3 aperture of air-valve has reached preset value, improves the work of frequency conversion fan 5 Frequency;
S3:When the working frequency of frequency conversion fan 5 is increased to preset value, output alarm signal;
S4:The preferential working frequency for reducing frequency conversion fan 5, if the working frequency of frequency conversion fan 5 is reduced to minimum value, subtracts The aperture of small air-valve 3.
Compared with prior art, vacuum control system provided by the invention in use, is not achieved default in negative pressure During value, the negative pressure in pipeline 2 is preferentially increased by the aperture of adjusting air valve 3, only the aperture of air-valve 3 reach higher value or During person's limiting value, just negative pressure is adjusted by increasing the working frequency of frequency conversion fan 5;It is corresponding, it is preset if negative pressure is more than Value then preferentially reduces the working frequency of frequency conversion fan 5, when the working frequency of frequency conversion fan 5 reduces to a certain extent, just passes through 3 aperture of adjusting air valve is throttled come the negative pressure for adjusting pipeline 2, and above-mentioned regulative mode is provided to that frequency conversion fan 5 can be reduced Run time in high frequency to extend the service life of frequency conversion fan 5, reduces energy consumption and discharge;When the aperture of air-valve 3 reaches Higher value or limiting value, while the frequency of frequency conversion fan 5 has also reached high value, the negative pressure in pipeline 2 be still not achieved or Person reaches preset value reluctantly, then illustrates that Severe blockage has occurred in the dust-extraction unit in system, needs to replace immediately, at this moment controller 6 output alarm signals prompt staff to replace dust-extraction unit;
By above-mentioned vacuum control system and its application method, the negative pressure in system can be made to be consistent substantially, from And the consistency of product quality, shorten the working time of wind turbine in high frequency, extend the service life of wind turbine, reduce energy consumption.
In above-mentioned vacuum control system, various structures, such as centrifugal, axial-flow type may be used in frequency conversion fan 5, In embodiments of the present invention, frequency conversion fan 5 is centrifugal blower.
Above-mentioned technical proposal is advanced optimized, in above-mentioned vacuum control system, frequency conversion fan 5 is provided with more, and One end of pipeline 2 is associated in, the quantity that controller 6 can also participate in the frequency conversion fan 5 of work by control is negative in pipeline 2 to adjust It presses, so as to make control means diversified, and frequency conversion fan 5 can be safeguarded under the premise of whole system is non-stop-machine, Improve working efficiency.
Preferably, in embodiments of the present invention, the aperture of air-valve 3 is not less than 15 ° always.
If the aperture of air-valves 3 is waited to reach after 100% in the working frequency for increasing frequency conversion fan 5, the sound of system may be caused It answers speed slower, is unfavorable for the quick adjusting of negative pressure in system, therefore, in the step S2 of the embodiment of the present invention, when air-valve 3 is opened When degree reaches 90%, that is, start to improve the working frequency of frequency conversion fan 5.
Above-mentioned technical proposal is advanced optimized, in order to protect frequency conversion fan 5, extends its service life, is implemented in the present invention In the step S3 of example, when the working frequency of frequency conversion fan 5 is increased to 90%, output alarm signal, relative to when frequency conversion fan 5 Working frequency be increased to 100%, producers can be made just to obtain signal before frequency conversion fan 5 is at full capacity, so as in time Adjustment reduces working time of the frequency conversion fan 5 under full load condition, helps to extend its service life.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention. A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one The most wide range caused.

Claims (6)

1. a kind of application method of vacuum control system, which is characterized in that including vacuum control system, the vacuum control system Including:
For detecting the B/P EGR Back Pressure Transducer EGR of the negative pressure value in pipeline;
The air-valve being arranged in the pipeline and the wind valve controller for adjusting the valve area;
It is set to the frequency conversion fan of described pipeline one end;
Controller, the signal input part of the controller are connect with the B/P EGR Back Pressure Transducer EGR, signal output end respectively with the change Frequency wind turbine and wind valve controller connection;
The application method includes step:
1) negative pressure value in pipeline is detected, and detected value and negative pressure preset value are compared, if detected value is preset less than negative pressure 2) value, then enter step, if detected value is more than negative pressure preset value, enter step 4);
2) preferentially increase the aperture of air-valve, if valve area has reached aperture preset value, improve the working frequency of frequency conversion fan;
3) when the working frequency of frequency conversion fan is increased to predetermined frequency value, output alarm signal;
4) working frequency of frequency conversion fan is preferentially reduced, if the working frequency of frequency conversion fan is reduced to minimum value, reduces air-valve Aperture.
2. the application method of vacuum control system according to claim 1, which is characterized in that the frequency conversion fan is centrifugation Wind turbine.
3. the application method of vacuum control system according to claim 1, which is characterized in that the frequency conversion fan is provided with More, it is connected in parallel on one end of the pipeline.
4. the application method of vacuum control system according to claim 1, which is characterized in that the aperture of the air-valve is not small In 15 °.
5. according to the application method of claim 1-4 any one of them vacuum control systems, which is characterized in that the step 2) In, if valve area reaches 90%, improve the working frequency of frequency conversion fan.
6. according to the application method of claim 1-4 any one of them vacuum control systems, which is characterized in that the step 3) In, when the working frequency of frequency conversion fan is increased to 90%, output alarm signal.
CN201611250314.2A 2016-12-29 2016-12-29 A kind of application method of vacuum control system Pending CN108249164A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108263862A (en) * 2016-12-30 2018-07-10 贵州中烟工业有限责任公司 A kind of stem blast system and its vacuum control system
CN111493357A (en) * 2020-04-20 2020-08-07 浙江中烟工业有限责任公司 Fan air suction system with load balancing function
CN112959870A (en) * 2021-03-16 2021-06-15 成都格力新晖医疗装备有限公司 Mobile laboratory, and negative pressure control method and device for mobile laboratory
CN115672918A (en) * 2022-11-16 2023-02-03 福建鼎盛钢铁有限公司 Dust removal energy-saving control method
CN115849017A (en) * 2022-12-02 2023-03-28 江西中烟工业有限责任公司 Automatic pipeline air volume adjusting system and method

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5654620A (en) * 1995-03-09 1997-08-05 Magnetek, Inc. Sensorless speed detection circuit and method for induction motors
JP2010196975A (en) * 2009-02-25 2010-09-09 Denso Corp Refrigerating cycle apparatus
CN102029203A (en) * 2010-10-25 2011-04-27 广州市泛美实业有限公司 Control system of laboratory variable air volume (VAV) fume hood
CN203310022U (en) * 2013-04-27 2013-11-27 河南中烟工业有限责任公司 Automatic inside and outside wire storage room differential pressure balancing device
JP2014121290A (en) * 2012-12-21 2014-07-03 Fulta Electric Machinery Co Ltd Outlet mechanism of carbon dioxide generator
CN203870081U (en) * 2014-05-07 2014-10-08 广西博世科环保科技股份有限公司 SCR low-temperature denitration pilot test device
CN104141964A (en) * 2014-04-22 2014-11-12 上海金自天正信息技术有限公司 Air supply system and method of industrial furnace
JP2015073606A (en) * 2013-10-07 2015-04-20 株式会社東芝 Clothes dryer
CN104856218A (en) * 2015-04-01 2015-08-26 广西中烟工业有限责任公司 Negative pressure automatic regulating system for material-feeding and cigarette-rod-forming machine of cigarette maker
CN105424105A (en) * 2015-11-06 2016-03-23 湖南核三力技术工程有限公司 Dust removal system main pipe blast capacity detecting method and online detecting device
CN105546896A (en) * 2016-03-10 2016-05-04 青岛大学 Control device for cooling air volume of outdoor condenser
CN105588302A (en) * 2015-12-17 2016-05-18 安徽华盛科技控股股份有限公司 CIT dead-zone-free rapid pressure regulation system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5654620A (en) * 1995-03-09 1997-08-05 Magnetek, Inc. Sensorless speed detection circuit and method for induction motors
JP2010196975A (en) * 2009-02-25 2010-09-09 Denso Corp Refrigerating cycle apparatus
CN102029203A (en) * 2010-10-25 2011-04-27 广州市泛美实业有限公司 Control system of laboratory variable air volume (VAV) fume hood
JP2014121290A (en) * 2012-12-21 2014-07-03 Fulta Electric Machinery Co Ltd Outlet mechanism of carbon dioxide generator
CN203310022U (en) * 2013-04-27 2013-11-27 河南中烟工业有限责任公司 Automatic inside and outside wire storage room differential pressure balancing device
JP2015073606A (en) * 2013-10-07 2015-04-20 株式会社東芝 Clothes dryer
CN104141964A (en) * 2014-04-22 2014-11-12 上海金自天正信息技术有限公司 Air supply system and method of industrial furnace
CN203870081U (en) * 2014-05-07 2014-10-08 广西博世科环保科技股份有限公司 SCR low-temperature denitration pilot test device
CN104856218A (en) * 2015-04-01 2015-08-26 广西中烟工业有限责任公司 Negative pressure automatic regulating system for material-feeding and cigarette-rod-forming machine of cigarette maker
CN105424105A (en) * 2015-11-06 2016-03-23 湖南核三力技术工程有限公司 Dust removal system main pipe blast capacity detecting method and online detecting device
CN105588302A (en) * 2015-12-17 2016-05-18 安徽华盛科技控股股份有限公司 CIT dead-zone-free rapid pressure regulation system
CN105546896A (en) * 2016-03-10 2016-05-04 青岛大学 Control device for cooling air volume of outdoor condenser

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108263862A (en) * 2016-12-30 2018-07-10 贵州中烟工业有限责任公司 A kind of stem blast system and its vacuum control system
CN111493357A (en) * 2020-04-20 2020-08-07 浙江中烟工业有限责任公司 Fan air suction system with load balancing function
CN112959870A (en) * 2021-03-16 2021-06-15 成都格力新晖医疗装备有限公司 Mobile laboratory, and negative pressure control method and device for mobile laboratory
CN115672918A (en) * 2022-11-16 2023-02-03 福建鼎盛钢铁有限公司 Dust removal energy-saving control method
CN115849017A (en) * 2022-12-02 2023-03-28 江西中烟工业有限责任公司 Automatic pipeline air volume adjusting system and method
CN115849017B (en) * 2022-12-02 2024-08-20 江西中烟工业有限责任公司 Automatic pipeline air quantity adjusting system and method

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Application publication date: 20180706