CN112835387A - Liquid level control system and method and glass kiln - Google Patents
Liquid level control system and method and glass kiln Download PDFInfo
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- CN112835387A CN112835387A CN202110004012.1A CN202110004012A CN112835387A CN 112835387 A CN112835387 A CN 112835387A CN 202110004012 A CN202110004012 A CN 202110004012A CN 112835387 A CN112835387 A CN 112835387A
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- 239000007788 liquid Substances 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000011521 glass Substances 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 15
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Non-Electrical Variables (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The embodiment of the invention provides a liquid level control system and method and a glass kiln, belonging to the technical field of automatic control. The system includes a controller and a drive module, the controller including: multistage compensation module and comparison module, multistage compensation module is used for: a. calculating the actual liquid level LxAnd a set liquid level L0The liquid level deviation delta Ln; b. determining a frequency deviation delta Fn according to the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn on the basis of the liquid level deviation delta Ln, wherein the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn is divided into a plurality of sections according to the delta Ln, and the delta Fn and the delta Ln are the same in positive and negative in each section; the comparison module is configured to: c. at fundamental frequency F0Subtracting the frequency deviation delta Fn on the basis of the frequency deviation delta Fn to obtain the running frequency FxAs the output frequency F; and the driving module is used for feeding materials according to the output frequency F. The system enables the liquid level control of the kiln furnace to be more stable through multi-stage speed liquid level control.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a liquid level control system and method and a glass kiln.
Background
In the production process of medicinal glass, the stability of the liquid level of the kiln plays a crucial role in the quality of the glass, so that the liquid level of the kiln is required to be kept stable, and the feeding speed is also required to be kept stable.
In the prior art, PID (Proportional Integral Derivative) algorithm is mostly adopted for adjusting the liquid level of the kiln, however, the PID algorithm has the following defects: on one hand, PID parameters are difficult to set, and on the other hand, liquid level fluctuation and even sudden change are easy to cause by using PID control.
In view of the above problems, a liquid level control method is needed to make the liquid level control of the kiln more stable.
Disclosure of Invention
The embodiment of the invention aims to provide a liquid level control system, which enables the liquid level control of a kiln furnace to be more stable through multi-stage speed liquid level control and has no other disturbance interference or sudden change.
In order to achieve the above object, an embodiment of the present invention provides a liquid level control system, including a controller and a driving module, where the controller includes: the multi-section compensation module is used for: a. calculating the actual liquid level LxAnd a set liquid level L0The liquid level deviation delta Ln; b. determining a frequency deviation delta Fn from a correspondence of the liquid level deviation delta Ln to the frequency deviation delta Fn based on the liquid level deviation delta Ln, wherein the liquidDividing the corresponding relation between the bit deviation delta Ln and the frequency deviation delta Fn into a plurality of sections according to the delta Ln, wherein the delta Fn and the delta Ln are the same in positive and negative in each section; the comparison module is configured to: c. at fundamental frequency F0Subtracting the frequency deviation delta Fn on the basis of the frequency deviation delta Fn to obtain the running frequency FxAs the output frequency F; and the driving module is used for feeding materials according to the output frequency F.
Optionally, the controller further includes a frequency limiting module, configured to: will operate at the frequency FxAnd limiting the upper limit and the lower limit to obtain an output frequency F.
Optionally, in each section, Δ Fn is linearly related to Δ Ln.
Optionally, the number of the interval sections of the corresponding relationship between the liquid level deviation Δ Ln and the frequency deviation Δ Fn is 6-10 sections.
Optionally, the driving module includes a frequency converter and a feeder, and the frequency converter is configured to drive the feeder according to the output frequency F.
Optionally, the method further includes: a level meter for acquiring the actual level Lx。
Optionally, the controller is a PLC controller.
In another aspect, the invention provides a glass kiln comprising the liquid level control system of any one of the above.
In another aspect, the present invention provides a liquid level control method, comprising: obtaining the actual liquid level Lx(ii) a Calculating the actual liquid level LxAnd a set liquid level L0The liquid level deviation delta Ln; determining a frequency deviation delta Fn according to the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn on the basis of the liquid level deviation delta Ln, wherein the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn is divided into a plurality of sections according to the delta Ln, and the delta Fn and the delta Ln are the same in positive and negative in each section; at fundamental frequency F0Subtracting the frequency deviation delta Fn on the basis of the frequency deviation delta Fn to obtain the running frequency FxAs the output frequency F; and feeding according to the output frequency F.
Optionally, the feeding is carried out according to the output frequency FBefore, still include: will operate at the frequency FxAnd limiting the upper limit and the lower limit to obtain an output frequency F.
In another aspect, the present disclosure provides a machine-readable storage medium having instructions stored thereon for causing a machine to perform any of the above-described fluid level control methods.
In another aspect, the present invention provides a processor for executing a program, wherein the program is executed for performing any of the above-mentioned liquid level control methods.
Through the technical scheme, under the condition that the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn is divided into a plurality of sections, the corresponding value of the frequency deviation delta Fn in the section is determined according to the liquid level deviation delta Ln in different sections, so that the running frequency F is obtainedxAnd the charging operation is carried out, so that the liquid level control of the pit furnace is more stable relative to a PID algorithm, and other disturbance interference and mutation are avoided.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments 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 embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a block diagram of a fluid level control system according to an embodiment of the present disclosure;
FIG. 2 is a graph illustrating a liquid level deviation Δ Ln and a frequency deviation Δ Fn according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of a liquid level control system according to an embodiment of the present disclosure;
FIG. 4 is an exemplary block diagram of a fluid level control system according to an embodiment of the present application;
FIG. 5 is a flow chart of a program editing of a fluid level control system provided by an embodiment of the present application;
FIG. 6 is a flow chart of a method for controlling liquid level according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Aiming at the technical defects existing in the liquid level control by adopting a PID algorithm, the invention provides a liquid level control system which enables the liquid level control of a kiln furnace to be more stable without other disturbance interference and sudden change.
Fig. 1 is a block diagram of a liquid level control system according to an embodiment of the present application, and as shown in fig. 1, the system includes: the liquid level meter comprises a liquid level meter, a controller and a driving module, wherein the driving module comprises a frequency converter and a feeder, and the frequency converter drives the feeder to work according to a frequency signal output by the controller.
The liquid level meter is used for acquiring the actual liquid level L of the glass kilnx。
The controller is preferably a PLC controller, is used for calculating a liquid level control signal, and comprises a multi-segment compensation module and a comparison module, wherein the multi-segment compensation module is used for executing the following steps a-b:
a. calculating the actual liquid level LxAnd a set liquid level L0Is a liquid level deviation Δ Ln, i.e., Δ Ln equals Lx-L0For convenient calculation, the set liquid level L can be set0Is marked as 0mm, so the value of delta Ln is the actual liquid level L obtained by the liquid level meterxThe value of (c) is not converted.
b. Determining a frequency deviation delta Fn according to the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn on the basis of the liquid level deviation delta Ln;
the corresponding relationship between the liquid level deviation Δ Ln and the frequency deviation Δ Fn is divided into a plurality of sections according to the Δ Ln, and in each section, the Δ Fn and the Δ Ln are the same as positive and negative, and preferably, as shown in fig. 2, the Δ Fn and the Δ Ln are in a linear relationship, and parameter setting can be simpler by adopting the linear relationship. The number of the interval sections and the slope of each interval section are set according to actual conditions, the number of the interval sections can be preferably set to be 6-10 sections, the slope can be positive or negative, the greater the absolute value of the slope is, the faster the change speed of the delta Fn along with the delta Ln is, and the quicker the liquid level is restored to a stable state, and the liquid level control requirements under various production environments can be met by setting a plurality of interval sections and a plurality of slopes. The corresponding relation enables the calculated delta Fn to change smoothly, namely the frequency of the driving module changes smoothly, and the liquid level does not generate sudden change and large fluctuation.
The comparison module is used for executing the step c:
c. at fundamental frequency F0Subtracting the frequency deviation delta Fn on the basis of the frequency deviation delta Fn to obtain the running frequency FxAs the output frequency F.
In step c, an operating frequency F is definedxBase frequency F0The frequency deviation Δ Fn, such that: when the liquid level rises, Δ Ln is positive, Δ Fn is positive, FxDecrease; when the liquid level decreases, Δ Ln is negative, Δ Fn is negative, Fx(ii) is increased; the driving module feeds in raw material according to the frequency, and the effect of maintaining the stability of the liquid level of the kiln furnace and keeping the stable feeding speed can be achieved.
The controller also preferably includes a frequency limiting module for limiting the operating frequency FxAnd limiting the upper limit and the lower limit to obtain output frequency F, so that the output frequency does not exceed the operating frequency range of the driving module on the one hand, and the emptying speed is not too high to influence the stability of the liquid level of the kiln on the other hand.
Fig. 3 is a flow chart of the liquid level control system for realizing liquid level control.
FIG. 4 is a block diagram illustration of the above-described fluid level control system provided by an embodiment. IN fig. 4, the modules marked with "poly gon", "SUB" and "LIMIT" are all PLC blocks, wherein the poly gon blocks are used to perform the function of the multi-stage compensation module, and the input signal of the IN port is L0The output signal of the OUT port is Δ Fn. The SUB block is used to perform the function of the comparison block, with one of the two IN ports having an input signal F0The input signal of the other IN port is delta Fn, and the output signal of the OUT port is Fx. For LIMIT program blockIN the implementation of the frequency limiting module, the input signal at the IN port is FxThe H port input signal is the upper frequency limit, the L port input signal is the lower frequency limit, and the OUT port output signal is F.
FIG. 5 is a flow chart illustrating a program editing process of the above-described fluid level control system according to an embodiment.
The liquid level control system can be applied to the technical field of medicinal glass melting and is used for controlling the liquid level of glass in a glass kiln.
The present application further provides a liquid level control method corresponding to the liquid level control system described in the above embodiments, the method includes S102-S110, as shown in fig. 6:
s102, acquiring actual liquid level Lx；
S104, calculating the actual liquid level LxAnd a set liquid level L0The liquid level deviation delta Ln;
s106, based on the liquid level deviation delta Ln, determining a frequency deviation delta Fn according to the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn,
the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn is divided into a plurality of sections according to the delta Ln, and in each section, the delta Fn and the delta Ln are the same in positive and negative;
s108, at the basic frequency F0Subtracting the frequency deviation delta Fn on the basis of the frequency deviation delta Fn to obtain the running frequency FxAs the output frequency F;
and S110, feeding according to the output frequency F.
Preferably, before the execution of S110, the method further includes S109:
s109, converting the operating frequency FxAnd limiting the upper limit and the lower limit to obtain an output frequency F.
The beneficial effects of the liquid level control method are the same as those of the liquid level control system, and are not described herein.
The present application also provides a machine-readable storage medium having instructions stored thereon for causing a machine to perform the fluid level control method.
In another aspect, the present application further provides a processor for running a program, wherein the program is run for executing the liquid level control method.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (12)
1. A liquid level control system is characterized by comprising a controller and a driving module,
the controller includes: multistage compensation module and comparison module, multistage compensation module is used for:
a. calculating the actual liquid level LxAnd a set liquid level L0The liquid level deviation delta Ln;
b. determining a frequency deviation delta Fn from a correspondence of the liquid level deviation delta Ln and the frequency deviation delta Fn on the basis of the liquid level deviation delta Ln,
the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn is divided into a plurality of sections according to the delta Ln, and in each section, the delta Fn and the delta Ln are the same in positive and negative;
the comparison module is configured to:
c. at fundamental frequency F0Subtracting the frequency deviation delta Fn on the basis of the frequency deviation delta Fn to obtain the running frequency FxAs the output frequency F;
and the driving module is used for feeding materials according to the output frequency F.
2. The fluid level control system of claim 1, wherein the controller further comprises a frequency limit module to:
will operate at the frequency FxAnd limiting the upper limit and the lower limit to obtain an output frequency F.
3. The fluid level control system of claim 1, wherein the Δ Fn is linear with the Δ Ln for each segment.
4. The fluid level control system of claim 1, wherein the number of intervals of the correspondence between the fluid level deviation Δ Ln and the frequency deviation Δ Fn is 6-10.
5. The fluid level control system of claim 1, wherein the drive module comprises a frequency converter and a loader, the frequency converter being configured to drive the loader according to the output frequency F.
6. The fluid level control system of claim 1, further comprising:
a level meter for acquiring the actual level Lx。
7. The fluid level control system of claim 1, wherein the controller is a PLC controller.
8. A glass furnace comprising a liquid level control system according to any one of claims 1 to 7.
9. A method of fluid level control, comprising:
obtaining the actual liquid level Lx；
Calculating the actual liquid level LxAnd a set liquid level L0The liquid level deviation delta Ln;
determining a frequency deviation delta Fn from a correspondence of the liquid level deviation delta Ln and the frequency deviation delta Fn on the basis of the liquid level deviation delta Ln,
the corresponding relation between the liquid level deviation delta Ln and the frequency deviation delta Fn is divided into a plurality of sections according to the delta Ln, and in each section, the delta Fn and the delta Ln are the same in positive and negative;
at fundamental frequency F0Subtracting the frequency deviation delta Fn on the basis of the frequency deviation delta Fn to obtain the running frequency FxAs the output frequency F;
and feeding according to the output frequency F.
10. The method of claim 9, further comprising, prior to said charging according to said output frequency F:
will operate at the frequency FxAnd limiting the upper limit and the lower limit to obtain an output frequency F.
11. A machine-readable storage medium having stored thereon instructions for causing a machine to perform the method of level control according to any one of claims 9-10.
12. A processor characterized by a program for running, wherein the program is run for performing the liquid level control method according to any of claims 9-10.
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Cited By (2)
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