CN111420609A - Automatic control device and method for trace liquid online adding system - Google Patents
Automatic control device and method for trace liquid online adding system Download PDFInfo
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- CN111420609A CN111420609A CN202010139827.6A CN202010139827A CN111420609A CN 111420609 A CN111420609 A CN 111420609A CN 202010139827 A CN202010139827 A CN 202010139827A CN 111420609 A CN111420609 A CN 111420609A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/712—Feed mechanisms for feeding fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2111—Flow rate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2211—Amount of delivered fluid during a period
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/714—Feed mechanisms for feeding predetermined amounts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/7176—Feed mechanisms characterised by the means for feeding the components to the mixer using pumps
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0623—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the set value given to the control element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/06—Mixing of food ingredients
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
- Flow Control (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention provides an automatic control device of a trace liquid online adding system, which comprises a remote control system, a flow measuring system, a liquid pipeline flow control system, a P L C data system and a variable frequency pump control system, wherein the liquid pipeline flow control system calculates the currently required real-time liquid demand according to a formula transmitted by the remote control system and the front end logistics flow detected by the flow measuring system and transmits the currently required real-time liquid demand to the P L C data system, the P L C data system calculates the corresponding variable frequency speed according to the real-time liquid demand and the actual liquid quantity through a Dahlin algorithm and a Simith predictor, and adjusts the speed of a variable frequency pump through the variable frequency pump control system to ensure that the actual flow is equal to the required flow.
Description
Technical Field
The invention particularly relates to an automatic control device and method of a trace liquid online adding system.
Background
The addition of trace liquid belongs to an important technological process in the food processing industry, the current main addition mode is the addition in a mode of a pulse quantitative dosing pump, the precision cannot be guaranteed, the failure rate is high, the addition cannot be integrated into a control system of a whole plant, and the problems of mode flow lag, unstable control and incapability of sharing data exist.
Disclosure of Invention
The invention aims to provide an automatic control device and method for a trace liquid online adding system, which have an automatic function, can monitor the current required liquid flow of the system in real time, automatically calculate the required flow and control a variable frequency pump to automatically add.
The invention provides the following technical scheme:
an automatic control device of a trace liquid online adding system comprises:
the remote control system is used for setting a formula and transmitting the formula which is set in advance to the P L C data system;
the flow measurement system is used for detecting the flow of the material flow or the liquid flow of the front end and transmitting the flow to the P L C data system;
the liquid pipeline flow control system is used for calculating the currently required real-time liquid demand through the material flow and the formula at the front end and transmitting the currently required real-time liquid demand to a P L C data system;
the P L C data system is respectively connected with the remote control system, the flow measuring system and the liquid pipeline flow control system, receives the formula and the logistics flow and transmits the formula and the logistics flow to the liquid pipeline flow control system, also receives the real-time liquid demand, and calculates the corresponding variable frequency speed according to the real-time liquid demand and the actual liquid quantity through a Dahlin algorithm and a Simith predictor;
and the variable frequency pump control system adjusts the speed of the variable frequency pump according to the variable frequency speed transmitted by the P L C data system, so that the actual flow rate is equal to the required flow rate.
Preferably, the flow measurement system comprises a batch scale, a flow scale and an end-of-line flow meter, wherein the batch scale and the flow scale are used for measuring the material flow, and the end-of-line flow meter is used for measuring the liquid flow.
Preferably, the formula for calculating the real-time liquid demand is as follows: liquid content in the formula/(total formula amount-liquid content).
Preferably, the remote control system communicates with the P L C data system through ModbusTcp.
Preferably, the P L C data system deduces the first-order closed-loop system according to the real-time liquid demand and the liquid actual amount through a Dahlin algorithm and a Simith predictor, and controls the frequency conversion speed in real time.
An automatic control method of a trace liquid online adding system comprises the following steps:
s1, the remote control system transmits the given formula to the P L C data system;
s2, detecting the material flow or liquid flow at the front end by the flow measuring system, and transmitting the detection data to the P L C data system;
s3, the P L C data system receiving and transmitting the recipe and the stream flow to a liquid line flow control system;
s4, calculating the current required real-time liquid demand by the liquid pipeline flow control system according to the formula and the logistics flow and combining a formula, and transmitting the real-time liquid demand to the P L C data system;
s5, the P L C data system receives the real-time liquid demand, and calculates the corresponding variable frequency speed according to the real-time liquid demand and the actual liquid amount through a Dahlin algorithm and a Simith predictor, and transmits the variable frequency speed to a variable frequency pump control system;
and S6, the variable frequency pump control system adjusts the speed of the variable frequency pump according to the variable frequency speed transmitted by the P L C data system, so that the actual flow rate is equal to the required flow rate.
The invention has the advantages that the automatic liquid flow control system has an automatic function, does not need personnel interference during operation, can monitor the currently required liquid flow of the system in real time, automatically calculates the required flow through a formula given by a P L C data system and a remote control system, and controls the variable frequency pump to automatically add.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
Referring to fig. 1, an automatic control device of an online micro-liquid adding system includes:
the remote control system is used for setting a formula and transmitting the preset formula to the P L C data system;
the flow measurement system is used for detecting the flow of the material flow or the liquid flow of the front end and transmitting the flow to the P L C data system;
the liquid pipeline flow control system is used for calculating the currently required real-time liquid demand through the material flow and the formula at the front end and transmitting the current required real-time liquid demand to the P L C data system;
the P L C data system is respectively connected with the remote control system, the flow measuring system and the liquid pipeline flow control system, receives the formula and the logistics flow and transmits the formula and the logistics flow to the liquid pipeline flow control system, also receives the real-time liquid demand, and calculates the corresponding variable frequency speed according to the real-time liquid demand and the actual liquid quantity through a Dahlin algorithm and a Simith predictor;
and the variable frequency pump control system adjusts the speed of the variable frequency pump according to the variable frequency speed transmitted by the P L C data system, so that the actual flow rate is equal to the required flow rate.
Specifically, the flow measurement system comprises a batch scale, a flow scale and a pipeline end flowmeter, wherein the batch scale and the flow scale are used for measuring the flow of material flow, and the pipeline end flowmeter is used for measuring the flow of liquid.
Specifically, the formula for calculating the real-time liquid demand is as follows: liquid content in the formula/(total formula amount-liquid content).
Specifically, the remote control system communicates with the P L C data system through ModbusTcp.
Specifically, the P L C data system deduces a first-order closed-loop system according to the real-time liquid demand and the liquid actual quantity through a Dahlin algorithm and a Simith predictor, and controls the frequency conversion speed in real time.
As shown in fig. 1, an automatic control method of a trace liquid online adding system includes the following steps:
s1, the remote control system transmits the given formula to the P L C data system;
s2, detecting the material flow or liquid flow at the front end by the flow measuring system, and transmitting the detection data to the P L C data system;
the S3 and P L C data systems receive the formula and the material flow and transmit the formula and the material flow to the liquid pipeline flow control system;
s4, calculating the current required real-time liquid demand by the liquid pipeline flow control system according to the formula and the logistics flow and combining the formula, and transmitting the real-time liquid demand to the P L C data system;
the S5 and P L C data systems receive the real-time liquid demand, and calculate the corresponding variable frequency speed according to the real-time liquid demand and the actual liquid amount through a Dahlin algorithm and a Simith predictor, and transmit the variable frequency speed to a variable frequency pump control system;
and S6, the variable frequency pump control system adjusts the speed of the variable frequency pump according to the variable frequency speed transmitted by the P L C data system, so that the actual flow rate is equal to the required flow rate.
The invention has automatic function, does not need personnel to interfere during operation, can monitor the current required liquid flow of the system in real time, automatically calculates the required flow through a formula given by a P L C data system and a remote control system, and controls the variable frequency pump to be automatically added.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An automatic control device of a trace liquid online adding system is characterized by comprising:
the remote control system is used for setting a formula and transmitting the formula which is set in advance to the P L C data system;
the flow measurement system is used for detecting the flow of the material flow or the liquid flow of the front end and transmitting the flow to the P L C data system;
the liquid pipeline flow control system is used for calculating the currently required real-time liquid demand through the material flow and the formula at the front end and transmitting the currently required real-time liquid demand to a P L C data system;
the P L C data system is respectively connected with the remote control system, the flow measuring system and the liquid pipeline flow control system, receives the formula and the logistics flow and transmits the formula and the logistics flow to the liquid pipeline flow control system, also receives the real-time liquid demand, and calculates the corresponding variable frequency speed according to the real-time liquid demand and the actual liquid quantity through a Dahlin algorithm and a Simith predictor;
and the variable frequency pump control system adjusts the speed of the variable frequency pump according to the variable frequency speed transmitted by the P L C data system, so that the actual flow rate is equal to the required flow rate.
2. The automatic control device of an online adding system of micro-liquid according to claim 1, wherein the flow measuring system comprises a batch scale, a flow scale and an end-of-line flow meter, the batch scale and the flow scale are used for measuring the flow rate of the material flow, and the end-of-line flow meter is used for measuring the flow rate of the liquid.
3. The automatic control device of an online micro-liquid adding system according to claim 1, wherein the formula for calculating the real-time liquid demand is as follows: liquid content in the formula/(total formula amount-liquid content).
4. The automatic control device of an online adding system of micro-liquid according to claim 1, wherein the remote control system communicates with the P L C data system via ModbusTcp.
5. The automatic control device of an online adding system of micro-liquid as claimed in claim 1, wherein the P L C data system derives the first-order closed-loop system to control the frequency conversion speed in real time according to the real-time liquid demand and the liquid actual quantity through Dahlin algorithm and Simith predictor.
6. An automatic control method of a trace liquid online adding system is characterized by comprising the following steps:
s1, the remote control system transmits the given formula to the P L C data system;
s2, detecting the material flow or liquid flow at the front end by the flow measuring system, and transmitting the detection data to the P L C data system;
s3, the P L C data system receiving and transmitting the recipe and the stream flow to a liquid line flow control system;
s4, calculating the current required real-time liquid demand by the liquid pipeline flow control system according to the formula and the logistics flow and combining a formula, and transmitting the real-time liquid demand to the P L C data system;
s5, the P L C data system receives the real-time liquid demand, and calculates the corresponding variable frequency speed according to the real-time liquid demand and the actual liquid amount through a Dahlin algorithm and a Simith predictor, and transmits the variable frequency speed to a variable frequency pump control system;
and S6, the variable frequency pump control system adjusts the speed of the variable frequency pump according to the variable frequency speed transmitted by the P L C data system, so that the actual flow rate is equal to the required flow rate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010139827.6A CN111420609A (en) | 2020-03-03 | 2020-03-03 | Automatic control device and method for trace liquid online adding system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010139827.6A CN111420609A (en) | 2020-03-03 | 2020-03-03 | Automatic control device and method for trace liquid online adding system |
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| CN111420609A true CN111420609A (en) | 2020-07-17 |
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| CN202010139827.6A Pending CN111420609A (en) | 2020-03-03 | 2020-03-03 | Automatic control device and method for trace liquid online adding system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112794442A (en) * | 2021-01-22 | 2021-05-14 | 重庆市巴南排水有限责任公司 | Carbon source adding device and adding method based on biochemical treatment process |
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