CN101782781B - Automatic control system for conveying ingredients - Google Patents
Automatic control system for conveying ingredients Download PDFInfo
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- CN101782781B CN101782781B CN 200910077095 CN200910077095A CN101782781B CN 101782781 B CN101782781 B CN 101782781B CN 200910077095 CN200910077095 CN 200910077095 CN 200910077095 A CN200910077095 A CN 200910077095A CN 101782781 B CN101782781 B CN 101782781B
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Abstract
The invention discloses an automatic control system for conveying ingredients, which comprises a signal detecting unit, a flow integrating unit, a PID algorithm control unit and a frequency conversion control drive unit. The signal detecting unit is used for detecting and outputting a load per unit volume of a conveyer belt for bearing the ingredients and speed information of the conveyer belt; the flow integrating unit is used for carrying out flow integrating according to the load per unit volume and the speed information to obtain an actual value of a feeding volume; the PID algorithm control unit is used for taking an absolute value of the difference between a set value of the feeding volume and the actual value of the feeding volume as a deviation value e and outputting a deviation signal after carrying out PID (Proportion Integration Differentiation) operation on the deviation value e; the frequency conversion control drive unit comprises a frequency converter and a driving motor; the driving motor is used for driving the conveyer belt to move; and the frequency converter adjusts a frequency of the driving motor according to the deviation signal. The technical scheme of the invention is that the dynamic automatic control system has 1 percent of cutting accuracy, high accuracy and stable system and meets the technological requirements.
Description
Technical field
The present invention relates to the automatic control field, be specifically related to a kind of automatic control system for conveying ingredients.
Background technology
In the suitability for industrialized production, usually need adopt to carry to bring and transport the batching that needs; With the plasterboard is example; Its production is a continuous production run; The required raw material of production plasterboard---the quantitative ingredient of gesso is a key factor that influences the plasterboard quality, and the quantitative ingredient of gesso mainly is that the method that adopts sensor, instrument to add frequency-converting speed-governing control system is prepared burden at present.Yet owing to detection, modeling, algorithm, the precision of batching generally can only be controlled at about 1.5%.
Summary of the invention
The technical matters that the present invention will solve provides a kind of automatic control system for conveying ingredients, and proportioning accuracy can reach 1%.
In order to address the above problem, the invention provides a kind of automatic control system for conveying ingredients, comprising:
Detecting signal unit is used for detecting in real time and output is used to carry unit volume loading and the velocity information of said conveying belt of the conveying belt of batching;
Flow integrating unit is used for carrying out flow accumulation according to said unit volume loading and velocity information, obtains the actual value of feeding capacity;
PID pid algorithm control module, the absolute value of difference of actual value of set-point and said feeding capacity that is used to get feeding capacity be as deviate e, to this deviate e carry out ratio, integration, the back output bias signal of differentiating;
The VFC gear unit comprises frequency converter and drive motor; Said drive motor is used to drive said conveying belt motion; Said frequency converter is regulated the frequency of said drive motor according to said deviation signal.
Further, said detecting signal unit comprises:
Load sensor is used for detecting and exporting in real time the unit volume loading of conveying belt;
Photoelectric encoder is used to detect the angular velocity of said drive motor, with the velocity information output of this angular velocity as conveying belt.
Further, said detecting signal unit also comprises:
Filtration module is connected between the output terminal and flow integrating unit of said load sensor, is used for the unit volume loading of elimination sudden change.
Further, flow integrating unit is carried out flow accumulation and specifically is meant:
Multiply by the girth of the head roll of said conveying belt with said angular velocity, obtain linear velocity;
Multiply by the area of conveying belt with this linear velocity then, obtain flow perpendicular to the xsect of translation direction;
Multiply by said unit volume loading with this flow, obtain the actual value of feeding capacity.
Further, said flow integrating unit also is used for corresponding 4～20 milliamperes the integrating signal that becomes standard of actual value with said feeding capacity, then output.
Further, described system also comprises:
The PLC output module is used for the deviation signal of said pid algorithm control module output is demarcated, and becomes 4～20 milliamperes deviation signal output of standard.
Further; Preserve the milliampere value of different sizes and the corresponding relation between the different frequency value in the said frequency converter; According to 4～20 milliamperes deviation signal of the standard of PLC output module output, be the pairing frequency values of milliampere value of deviation signal with the frequency adjustment of said drive motor.
Further, the deviation signal CV of said pid algorithm control module output is:
Wherein, Kp is the proportional gain constant, and Ki is the storage gain constant, and Kd is a differential gain constant; Dt is the time in SI; PV is the actual value of feeding capacity, and PV (n-1) is the actual value of preceding feeding capacity when once sampling; E is deviate e; E (n-1) is preceding deviate e when once sampling; Bias is a feedforward value.
Further, the Kp scope is 1.2 to 2.3, and the Ki scope is 20 to 50, and Kd is 0, and Bias is 0.
Further, Kp is directly proportional with said deviate e, and Ki and said deviate e are inversely proportional to.
Technical scheme of the present invention is a dynamic automatic control system, and shear precision can reach 1%, and precision is high, and system stability, has satisfied technological requirement.The loading that a prioritization scheme of the present invention detects through load sensor how much control preparatory batcher, make the ingredients by weight of the unit length on the conveying belt keep stable as far as possible.Another prioritization scheme of the present invention has carried out filtering to the loading signal of load sensor output, has improved the stability of system.Another prioritization scheme of the present invention has improved the adjustment precision of feeding capacity through the setting of parameter among the PID.
Description of drawings
Fig. 1 is the structural representation of the automatic control system for conveying ingredients of the embodiment of the invention one.
Embodiment
To combine accompanying drawing and embodiment that technical scheme of the present invention is explained in more detail below.
Embodiment one, and a kind of automatic control system for conveying ingredients is that example describes with the gesso in the present embodiment, can be other similar batching in the practical application; As shown in Figure 1, said system comprises:
Detecting signal unit is used for detecting in real time and exporting the unit volume loading of the conveying belt 1 that is loaded with gesso and the velocity information of said conveying belt.
In the present embodiment, said detecting signal unit comprises:
During practical application, detecting signal unit also can obtain linear velocity with the girth that this angular velocity multiply by the head roll 9 of said conveying belt 1, and the point-to-point speed of conveying belt 1 just is with the velocity information output of this linear velocity as conveying belt 1.In addition, can otherwise carry out the detection of loading and velocity information, extrapolate the unit volume loading behind the pressure such as obtaining with pressure transducer; For another example with the said angular velocity of other Equipment Inspection of testing the speed, or directly measure the point-to-point speed of conveying belt 1.
In the present embodiment, said detecting signal unit can also comprise a filtration module, is connected between the output terminal and flow integrating unit 2 of said load sensor 5, is used for the unit volume loading of elimination sudden change; Can improve the stability of system like this; " sudden change " can define according to actual conditions, such as being the absolute value of difference of current detection unit volume the loading constantly and last unit volume loading that detects the moment during greater than a threshold value, is judged to be " sudden change ".
In the present embodiment, if velocity information is said angular velocity, then flow integrating unit 2 is carried out flow accumulation and specifically is meant:
Multiply by the girth of the head roll 9 of said conveying belt 1 with this angular velocity, obtain linear velocity;
Multiply by the area of conveying belt 1 with this linear velocity then, obtain flow perpendicular to the xsect of translation direction;
Multiply by said unit volume loading with this flow, obtain the actual value of gesso feeding capacity.
If velocity information is a linear velocity, just need not calculate linear velocity again when then flow integrating unit is carried out flow accumulation.
Said flow integrating unit 2 can also be used for corresponding 4～20 milliamperes the integrating signal that becomes standard with the actual value X of said gesso feeding capacity, then output.
PID (Proportion Integration Differentiation; PID) the algorithm controls unit 3; The absolute value of difference of actual value X of set-point W and said gesso feeding capacity that is used to get the gesso feeding capacity is as deviate e, to this deviate e carry out ratio, integration, the back output bias signal of differentiating.
In the present embodiment, the deviation signal CV of said pid algorithm control module 3 outputs is:
Wherein, Kp is the proportional gain constant, and Ki is the storage gain constant, and Kd is a differential gain constant; Dt is the time in SI; PV is the actual value X of feeding capacity, and PV (n-1) is the actual value X of preceding feeding capacity when once sampling; E is a process variable, i.e. the deviate e of PV and feeding capacity set-point equals | W-X|; E (n-1) is preceding process variable when once sampling; Bias is a feedforward value.
In the present embodiment, the Kp scope is 1.2 to 2.3, and the Ki scope is 20 to 50, Kd=0, Bias=0.
In the present embodiment, Kp, Ki regulate according to the size of deviate e, and Kp is directly proportional with said deviate e, and Ki and said deviate e are inversely proportional to.
In the present embodiment, if said flow integrating unit 2 output is 4～20 milliamperes integrating signal, then in the pid algorithm control module, the set-point of then said gesso feeding capacity also is 4～20 milliamperes a signal of standard.
In the present embodiment, said system can also comprise PLC output module 7; Said PLC output module 7 is used for the deviation signal of said pid algorithm control module 3 outputs is demarcated, and becomes 4～20 milliamperes deviation signal output of standard.
The VFC gear unit comprises frequency converter 4 and drive motor 8; Said frequency converter is regulated the frequency of drive motor 8 according to said deviation signal, thereby changes the angular velocity of said drive motor 8, to reach the purpose of regulating the gesso dosage.
In the present embodiment; Preserve the milliampere value of different sizes and the corresponding relation between the different frequency value in the frequency converter; According to 4～20 milliamperes deviation signal of the standard of PLC output module 7 output, be the pairing frequency values of milliampere value of deviation signal with the frequency adjustment of said drive motor 8.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.
Claims (7)
1. an automatic control system for conveying ingredients is characterized in that, comprising:
Detecting signal unit is used for detecting in real time and output is used to carry unit volume loading and the velocity information of said conveying belt of the conveying belt of batching;
Flow integrating unit is used for carrying out flow accumulation according to said unit volume loading and velocity information, obtains the actual value of feeding capacity;
PID pid algorithm control module, the absolute value of difference of actual value of set-point and said feeding capacity that is used to get feeding capacity be as deviate e, to this deviate e carry out ratio, integration, back output bias signal CV differentiates:
Wherein, Kp is the proportional gain constant, and Ki is the storage gain constant, and Kd is a differential gain constant; Dt is the time in SI; PV is the actual value of feeding capacity, and PV (n-1) is the actual value of preceding feeding capacity when once sampling; E is deviate e; Bias is a feedforward value; Kp is directly proportional with said deviate e, and Ki and said deviate e are inversely proportional to;
The VFC gear unit comprises frequency converter and drive motor; Said drive motor is used to drive said conveying belt motion; Said frequency converter is regulated the frequency of said drive motor according to said deviation signal.
2. the system of claim 1 is characterized in that, said detecting signal unit comprises:
Load sensor is used for detecting and exporting in real time the unit volume loading of conveying belt;
Photoelectric encoder is used to detect the angular velocity of said drive motor, with the velocity information output of this angular velocity as conveying belt.
3. system as claimed in claim 2 is characterized in that, said detecting signal unit also comprises:
Filtration module is connected between the output terminal and flow integrating unit of said load sensor, is used for the unit volume loading of elimination sudden change.
4. system as claimed in claim 2 is characterized in that, flow integrating unit is carried out flow accumulation and specifically is meant:
Multiply by the girth of the head roll of said conveying belt with said angular velocity, obtain linear velocity;
Multiply by the area of conveying belt with this linear velocity then, obtain flow perpendicular to the xsect of translation direction;
Multiply by said unit volume loading with this flow, obtain the actual value of feeding capacity.
5. according to any one of claims 1 to 4 system is characterized in that:
Said flow integrating unit also is used for corresponding 4～20 milliamperes the integrating signal that becomes standard of actual value with said feeding capacity, then output.
6. according to any one of claims 1 to 4 system is characterized in that, also comprises:
The PLC output module is used for the deviation signal of said pid algorithm control module output is demarcated, and becomes 4～20 milliamperes deviation signal output of standard.
7. system as claimed in claim 6 is characterized in that:
Preserve the milliampere value of different sizes and the corresponding relation between the different frequency value in the said frequency converter; According to 4～20 milliamperes deviation signal of the standard of PLC output module output, be the pairing frequency values of milliampere value of deviation signal with the frequency adjustment of said drive motor.
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| CN 200910077095 CN101782781B (en) | 2009-01-20 | 2009-01-20 | Automatic control system for conveying ingredients |
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| CN 200910077095 CN101782781B (en) | 2009-01-20 | 2009-01-20 | Automatic control system for conveying ingredients |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102059071A (en) * | 2010-11-16 | 2011-05-18 | 吕斌 | Automatic blending material control system for sintering production |
| CN103744444A (en) * | 2014-01-22 | 2014-04-23 | 无锡建苑自动控制工程研究设计有限公司 | Coal water slurry tracking burdening control system |
| CN105799061A (en) * | 2016-03-31 | 2016-07-27 | 北新集团建材股份有限公司 | Automatic proportioning method and system |
| CN106003400A (en) * | 2016-05-23 | 2016-10-12 | 北新集团建材股份有限公司 | Gypsum slurry thickness fine regulation system and method |
| CN108726147B (en) * | 2017-04-24 | 2019-10-01 | 北新集团建材股份有限公司 | A kind of desulfurized gypsum uniformly adds feeding system and method |
| CN107390514A (en) * | 2017-07-26 | 2017-11-24 | 中国新型建材设计研究院 | A kind of frit automatic batching system discharge difference control method |
| CN108153340B (en) * | 2017-12-11 | 2021-01-29 | 福建泉成机械有限公司 | Automatic batching method |
| CN113148674B (en) * | 2021-04-20 | 2022-02-18 | 安徽中烟工业有限责任公司 | Storage cabinet discharge flow calculation method based on grating |
| CN114180292A (en) * | 2021-12-10 | 2022-03-15 | 烟台杰瑞石油服务集团股份有限公司 | Transportation metering device |
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Non-Patent Citations (1)
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| 罗才生 等.第六节 配料皮带秤的PID调节.《皮带秤》.中国计量出版社,1992,第223-226. * |
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Application publication date: 20100721 Assignee: BEIJING NEW BUILDING MATERIAL (ZHENJIANG) Co.,Ltd. Assignor: BEIJING NEW BUILDING MATERIALS PLC Contract record no.: 2013110000029 Denomination of invention: Automatic control system for conveying ingredients Granted publication date: 20121219 License type: Exclusive License Record date: 20130620 |
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Effective date of registration: 20230322 Address after: No.2, Lingang industrial concentration zone, Xiashu Town, Jurong City, Zhenjiang City, Jiangsu Province Patentee after: BEIJING NEW BUILDING MATERIAL (ZHENJIANG) Co.,Ltd. Address before: 100037, Beijing, Haidian District, Three Mile Road, No. 11, China building materials building, 16 floor Patentee before: BEIJING NEW BUILDING MATERIALS PLC |
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