CN114574869B - Defoaming process control method, device and system for degreasing cleaning machine - Google Patents
Defoaming process control method, device and system for degreasing cleaning machine Download PDFInfo
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- CN114574869B CN114574869B CN202210179792.8A CN202210179792A CN114574869B CN 114574869 B CN114574869 B CN 114574869B CN 202210179792 A CN202210179792 A CN 202210179792A CN 114574869 B CN114574869 B CN 114574869B
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000004140 cleaning Methods 0.000 title claims abstract description 58
- 238000005238 degreasing Methods 0.000 title claims abstract description 49
- 238000004886 process control Methods 0.000 title claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 169
- 239000006260 foam Substances 0.000 claims abstract description 80
- 239000003513 alkali Substances 0.000 claims abstract description 67
- 230000001276 controlling effect Effects 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 239000011159 matrix material Substances 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 3
- 230000001808 coupling effect Effects 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000012071 phase Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 19
- 239000010959 steel Substances 0.000 abstract description 19
- 230000008569 process Effects 0.000 description 18
- 230000006870 function Effects 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000003860 storage Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 5
- 239000002518 antifoaming agent Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007127 saponification reaction Methods 0.000 description 4
- 229920002545 silicone oil Polymers 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 238000003491 array Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005237 degreasing agent Methods 0.000 description 2
- 239000013527 degreasing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000010731 rolling oil Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Degasification And Air Bubble Elimination (AREA)
Abstract
The disclosure provides a degreasing cleaning machine defoaming process control method, device and system, comprising the following steps: judging whether the automatic control starting condition is met; when the automatic control starting condition is provided, determining the target rotating speed of the bubble suction pump motor according to the liquid level height of the alkali liquor tank and the load condition of the bubble suction pump motor; according to the target rotating speed of the bubble suction pump motor and the opening of a flap valve of the defoaming box, the pressure in the defoaming box is regulated to eliminate foam, so that the defoaming rate is improved and the cleaning quality of the strip steel surface is improved by controlling the negative pressure stability of the defoaming box.
Description
Technical Field
The disclosure relates to the technical field of steel plate surface treatment, in particular to a control method, a device and a system for defoaming process of degreasing cleaning machinery.
Background
Degreasing and cleaning are one of the indispensable procedures for surface treatment in the strip steel production process, and are used for removing residual iron powder, grease and other attachments on the surface of the strip steel, so that the cleanliness of the surface of the strip steel is improved, the subsequent annealing quality and the adhesive force of a galvanization procedure are improved, and the quality defect of iron leakage on the surface of the coated strip steel is avoided. The degreasing agent for cleaning is produced by compounding a surfactant with an alkali, but the rolling oil and the alkali and the surfactant undergo saponification reaction, and foam is easily produced when the saponification component exceeds a certain concentration.
In the related art, a chemical foam suppressing means is often adopted, that is, an interface tension is reduced by adding a defoaming agent containing silicone oil, so that foam is broken. The defoaming mode is high in cost, and silicone oil in the defoaming agent can damage the compactness of the steel plate and the coating, so that the serious problem of iron leakage of the coated steel plate is caused, and meanwhile, the production cost and the environmental protection pressure are increased.
Disclosure of Invention
The disclosure provides a degreasing cleaning machine defoaming process control method, device and system, which aim to solve one of the technical problems in the related art at least to a certain extent.
An embodiment of a first aspect of the present disclosure provides a method for controlling a defoaming process of a degreasing cleaning machine, including: judging whether the automatic control starting condition is met; when the automatic control starting condition is provided, determining the target rotating speed of the bubble suction pump motor according to the liquid level height of the alkali liquor tank and the load condition of the bubble suction pump motor; and adjusting the pressure in the defoaming box according to the target rotating speed of the foam suction pump motor and the opening degree of a flap valve of the defoaming box so as to eliminate foam.
An embodiment of a second aspect of the present disclosure provides a degreasing cleaning machine defoaming process control apparatus, including: the judging module is used for judging whether the automatic control starting condition is provided; the determining module is used for determining the target rotating speed of the bubble suction pump motor according to the liquid level height of the alkali liquor tank and the load condition of the bubble suction pump motor when the automatic control starting condition is met; and the adjusting module is used for adjusting the pressure in the defoaming box according to the target rotating speed of the foam suction pump motor and the opening degree of a flap valve of the defoaming box so as to eliminate foam.
Embodiments of a third aspect of the present disclosure provide a degreasing cleaning machine defoaming system, comprising: the device comprises a controller, an alkali liquor box, a foam suction pump connected with the alkali liquor box, a rotary defoaming column connected with the foam suction pump and a defoaming box; the top of the alkali liquor box is provided with a foam outlet, the foam outlet is connected with the inlet of the foam suction pump through a foam suction pipe, and the foam suction pipe is provided with a pneumatic regulating valve; the outlet of the foam suction pump is connected with the inlet of the rotary defoaming column, the outlet of the rotary defoaming column is connected with the defoaming box, and spiral blades are arranged in the rotary defoaming column; the top of the defoaming box is provided with a gas phase outlet and is connected with the alkali liquor box through an exhaust pump; the bottom of the defoaming box is provided with a liquid phase outlet and is connected with the alkali liquor box through a pneumatic liquid discharge pump; wherein, a flap valve used for driving a stepping motor is arranged in the defoaming box; the controller is respectively connected with the alkali liquor tank, the foam suction pump, the rotary foam removal column and the foam removal tank and is used for executing the degreasing cleaning machine foam removal process control method disclosed by the embodiment of the disclosure.
An embodiment of a fourth aspect of the present disclosure proposes an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the degreasing cleaning machine defoaming process control method of embodiments of the present disclosure.
A fifth aspect embodiment of the present disclosure proposes a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the degreasing cleaning machine defoaming process control method disclosed in the embodiments of the present disclosure.
In this embodiment, whether or not the automatic control start condition is provided is determined; when the automatic control starting condition is provided, determining the target rotating speed of the bubble suction pump motor according to the liquid level height of the alkali liquor tank and the load condition of the bubble suction pump motor; according to the target rotating speed of the bubble suction pump motor and the opening of a flap valve of the defoaming box, the pressure in the defoaming box is regulated to eliminate foam, so that the defoaming rate is improved and the cleaning quality of the strip steel surface is improved by controlling the negative pressure stability of the defoaming box.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow diagram of a degreasing cleaning machine defoaming process control method provided in accordance with one embodiment of the present disclosure;
FIG. 2 is a schematic flow diagram of degreasing cleaning machine defoaming process control provided in accordance with another embodiment of the present disclosure;
FIG. 3 is a flow chart of a degreasing cleaning machine defoaming process control method;
FIG. 4 is a schematic diagram of a defoaming system for a degreasing cleaning machine according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a degreasing cleaning machine defoaming process control apparatus provided in accordance with one embodiment of the present disclosure;
FIG. 6 illustrates a block diagram of an exemplary computer device suitable for use in implementing embodiments of the present disclosure.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.
At present, degreasing and cleaning are one of the indispensable procedures for surface treatment in the strip steel production process, and are used for removing residual iron powder, grease and other attachments on the surface of the strip steel, so that the cleanliness of the surface of the strip steel is improved, the subsequent annealing quality and the adhesion force of a galvanization procedure are increased, and the quality defect of iron leakage on the surface of the coated strip steel is avoided. The degreasing agent for cleaning is produced by compounding a surfactant with an alkali, but the rolling oil and the alkali and the surfactant undergo saponification reaction, and foam is easily produced when the saponification component exceeds a certain concentration.
In the related art, a chemical foam suppressing means is often adopted, that is, an interface tension is reduced by adding a defoaming agent containing silicone oil, so that foam is broken. The defoaming mode is high in cost, and silicone oil in the defoaming agent can damage the compactness of the steel plate and the coating, so that the serious problem of iron leakage of the coated steel plate is caused, and meanwhile, the production cost and the environmental protection pressure are increased.
In view of the above problems, the present disclosure provides a method, a device and a system for controlling defoaming process of degreasing cleaning machine.
Fig. 1 is a flow chart of a degreasing cleaning machine defoaming process control method provided in accordance with an embodiment of the present disclosure.
It should be noted that, the execution body of the degreasing and cleaning machine defoaming process control method according to the embodiments of the present disclosure may be a degreasing and cleaning machine defoaming process control device, which may be implemented in software and/or hardware, and the device may be configured in a controller, where the controller may be an electronic device or the like.
The electronic device may be a personal computer (Personal Computer, abbreviated as PC), a cloud device, a mobile device, etc., and the mobile device may be, for example, a mobile phone, a tablet computer, a personal digital assistant, a wearable device, a vehicle-mounted device, etc., which have various hardware devices including an operating system, a touch screen, and/or a display screen.
As shown in fig. 1, the degreasing cleaning machine defoaming process control method may include the steps of:
step 101, it is determined whether or not the automatic control start condition is provided.
In an embodiment of the present disclosure, the automatic control conditions of the degreasing cleaning machine defoaming system include: (1) normal system communication; (2) no sudden stop of the system; (3) switching on the foam suction pump frequency converter; (4) the cooling fan of the bubble pump frequency converter has no fault; (5) opening a pneumatic control valve; (6) operating the exhaust pump; (7) the pneumatic unloading valve is communicated; (8) the normal control pressure of the electric control pressure reducing valve is more than 0.5bar; (9) bubble pump seal bag pressure > 0.3bar; (10) operating the pneumatic liquid discharge pump; (11) the alkali liquor tank level meter works normally; (12) the defoaming box level meter works normally; (13) the pressure in the defoaming box is normal; and (14) the liquid level in the defoaming box is normal.
Step 102, when the automatic control starting condition is provided, determining the target rotating speed of the bubble suction pump motor according to the liquid level height of the alkali liquor tank and the load condition of the bubble suction pump motor.
The bubble suction pump motor adopts variable frequency speed regulation, wherein the bubble suction pump consists of a vane pump and a motor, and the load characteristic of the motor is set as fan water pump type load.
In the embodiment of the disclosure, the set rotating speed of the bubble suction pump motor is determined according to the liquid level height of the alkali liquor tank, the limit liquid level height and the set liquid level height, and the target rotating speed of the bubble suction pump motor is further determined according to the set rotating speed and the load condition of the bubble suction pump motor.
And 103, adjusting the pressure in the defoaming box according to the target rotating speed of the foam suction pump motor and the opening of a flap valve of the defoaming box so as to eliminate foam.
In the embodiment of the disclosure, the process of adjusting the pressure in the defoaming box is the process of enabling the defoaming box to be in a negative pressure state, because bubbles are easier to break in the negative pressure state, and the defoaming effect is better. The degreasing and cleaning mechanical defoaming system is an organic system, the defoaming box can circularly perform precipitation separation on air, alkali liquor and a small amount of foam formed in a rotary defoaming column, gas, liquid and foam are discharged, the corresponding pressure in the defoaming box can also change in real time under different load conditions of a foam suction pump motor, positive pressure, same atmospheric pressure or negative pressure is possible, the opening degree of a flap valve in the defoaming box, namely the rotation angle, is required to be adjusted through a stepping motor, the pressure in the defoaming box body is interfered, a negative pressure state is achieved, a better defoaming effect is obtained, and the defoaming rate is improved.
It is understood that after bubbles are formed in the defoaming box body, in the cleaning foam layer, a suspension layer formed by impurities and water which are mutually staggered exists among the bubbles, wherein the water flows downwards under the action of gravity and the internal pressure of the bubbles, the liquid film is gradually thinned, and finally the liquid film is broken. The process of the liquid film water layer is the process of bubble combination, and small bubbles are changed into large bubbles to be broken. Negative pressure defoaming is to expand foam to press water layer between bubbles, so that the downward flowing speed of water in liquid film is accelerated, the liquid film is gradually thinned, the volume and dispersion degree of foam are increased, and the mutual diffusion and combination degree of bubbles is increased. Due to the influence of negative pressure on bubbles, the foam is rapidly eliminated on the premise of not influencing the property of the base liquid.
In some embodiments, the negative pressure control of the defoaming box body is a non-deterministic system of parameter perturbation of multivariable strong coupling, the influence of parameter perturbation in the suction and exhaust rotating speed and the opening of the regulating valve is considered, the decoupling control of the suction and exhaust rotating speed and the opening of the regulating valve is realized, then a free matrix and a weighting matrix are selected based on Coprime decomposition theory, then a proper actual weighting function is selected according to the control performance requirement, and a robust multivariable decoupling controller is designed, as shown in a formula (1):
Wherein, For the set value of the speed difference of the suction and exhaust motor, V is the actual value of the speed difference of the suction and exhaust motor,/>For the flap valve opening setting value, M is the flap valve opening actual value, T V is the speed influence function, T M is the flap valve opening influence function, K Mσ is the coupling factor caused by flap valve opening adjustment, K Vθ is the coupling effect due to suction-discharge motor speed adjustment pressure, J is the jacobian coefficient, K V is the speed difference adjustment coefficient, K M is the flap valve opening adjustment coefficient, Δv * is the suction-discharge motor speed variable (speed variable of suction-bubble pump motor speed and exhaust pump drive motor speed), Δm * is the set point of flap valve opening adjustment amount, σ is the defoaming box pressure, and θ is the adjustment angle of the flap valve.
In the design of the robust decoupling controller, a weighting function array is selected as a diagonal array to ensure the decoupling requirement of the degreasing and cleaning mechanical defoaming system, as shown in a formula (2) and a formula (3), when no special requirement exists, the selection of the complementary sensitivity function W 3(s) can be the reciprocal of the sensitivity function W 1(s):
where M is the cut-off frequency, s is the laplace factor, a is the high frequency gain, ω 1＝100rad/s,ω3 =150 rad/s.
In the embodiment of the disclosure, when the liquid level in the defoaming box is greater than a first liquid level threshold value, controlling two pneumatic liquid discharge pumps connected with the defoaming box to run for a preset time period; when the liquid level in the defoaming box is smaller than the first liquid level threshold and larger than the second liquid level threshold, controlling one of the two pneumatic liquid discharge pumps to run for a preset time period; and when the liquid level in the defoaming box is smaller than the second liquid level threshold value, controlling the two pneumatic liquid discharge pumps to be not operated.
Wherein, two pneumatic liquid discharge pumps are connected in parallel, and one is one by one. The first liquid level threshold value can be 225mm, the preset time period can be 20 seconds, and when the liquid level in the defoaming box is greater than 225mm, the two pneumatic liquid discharge pumps are started to operate and stopped after 20 seconds of operation; the second liquid level threshold value can be 180mm, the preset time period can be 20 seconds, when the liquid level in the defoaming box is less than 225mm and greater than 180mm, one pneumatic liquid discharge pump is started, and the operation is stopped after 20 seconds; when the liquid level in the defoaming box is less than 180mm, the two pneumatic liquid discharge pumps do not operate. The pneumatic liquid discharge pump can be a pneumatic diaphragm liquid discharge pump.
In the embodiment of the disclosure, whether the automatic control starting condition is met or not is judged; when the automatic control starting condition is provided, determining the target rotating speed of the bubble suction pump motor according to the liquid level height of the alkali liquor tank and the load condition of the bubble suction pump motor; according to the target rotating speed of the bubble suction pump motor and the opening of a flap valve of the defoaming box, the pressure in the defoaming box is regulated to eliminate foam, so that the defoaming rate is improved and the cleaning quality of the strip steel surface is improved by controlling the negative pressure stability of the defoaming box.
Fig. 2 is a schematic flow chart of a control method of defoaming process of degreasing cleaning machinery according to another embodiment of the present disclosure, as shown in fig. 2, the method includes:
Step 201, it is determined whether or not the automatic control start condition is provided.
Step 202, determining the set rotating speed of the bubble suction pump motor under the liquid level of the alkali liquor tank according to the liquid level of the alkali liquor tank, the limit liquid level and the set liquid level.
In an example, the degreasing cleaning machine defoaming process control apparatus may perform the process of step 202 by comparing the liquid level of the lye tank with a set liquid level when the liquid level of the lye tank is greater than or equal to a limit liquid level; wherein the limit liquid level height is smaller than the set liquid level height; when the liquid level height of the alkali liquor box is larger than or equal to the set liquid level height, determining the set rotating speed of the suction pump motor under the liquid level height of the alkali liquor box as a first rotating speed.
The limit liquid level height can be 2.0 meters, the set liquid level height can be 2.5 meters, the limit liquid level height can be the lower limit of the liquid level height of the alkali liquor tank, and the set liquid level height can be the upper limit of the liquid level height of the alkali liquor tank.
The first rotation speed may be 2600 to 3000rpm, and may be set as needed, for example, the first rotation speed may be 2800rpm.
In another example, the degreasing and cleaning machine defoaming process control apparatus performs the process of step 202, for example, may be to determine that the set rotational speed of the bubble pump motor is the second rotational speed at the liquid level height of the lye tank when the liquid level height of the lye tank is less than the limit liquid level height.
The second rotation speed may be 800-1200 rpm, and may be set according to actual needs, for example, the second rotation speed may be 1000rpm.
In another example, the degreasing cleaning machine defoaming process control apparatus performs the process of step 202, for example, may be to determine that the set rotational speed of the suction pump motor is the third rotational speed at the liquid level height of the lye tank when the liquid level height of the lye tank is greater than or equal to the limit liquid level height and the liquid level height of the lye tank is less than the set liquid level height.
The third rotation speed may be 1800 to 2200rpm, and may be set as needed, for example, the third rotation speed may be 2000rpm.
And 203, determining the target rotating speed of the bubble suction pump motor according to the load condition of the bubble suction pump motor and the set rotating speed of the bubble suction pump motor under the liquid level of the alkali liquor tank.
In the embodiment of the present disclosure, the process of executing step 203 by the degreasing cleaning machine defoaming process control device may, for example, be that when the bubble suction pump motor is in an overload state, the set rotation speed of the bubble suction pump motor is reduced under the liquid level of the alkaline solution tank, so as to obtain the processed rotation speed of the bubble suction pump motor; under the rotating speed after the treatment, if the bubble suction pump motor is still in an overload state, the opening of a pneumatic regulating valve connected with the alkali liquor tank and the bubble suction pump is regulated until the bubble suction pump motor is in a non-overload state; and taking the processed rotating speed as a target rotating speed of the bubble pump motor.
In the embodiment of the disclosure, the method for judging the load state of the bubble pump by the degreasing and cleaning machine defoaming process control device may be that the working current in the bubble pump motor is judged to be greater than the rated current, and the bubble pump motor is judged to be in the overload state. Wherein the post-treatment rotational speed of the bubble pump motor may be 2000rpm.
In the embodiment of the disclosure, if the bubble pump motor is still in the overload state at the rotational speed after the processing, the method for adjusting the opening of the pneumatic adjusting valve may be to reduce 20% of the opening of the pneumatic adjusting valve every 60 seconds until the bubble pump motor is in the non-overload state.
In the embodiment of the disclosure, when the bubble pump motor is in a non-overload state, the opening degree of the pneumatic control valve is maintained, and the rotation speed of the bubble pump motor is set to 2800rpm.
And 204, adjusting the pressure in the defoaming box according to the target rotating speed of the foam suction pump motor and the opening degree of a flap valve of the defoaming box so as to eliminate foam.
The details of step 201 and step 204 may refer to step 101 and step 103 in the embodiment shown in fig. 1, and will not be described in detail here.
In the embodiment of the disclosure, whether the automatic control starting condition is met or not is judged; determining the set rotating speed of the suction pump motor under the liquid level of the alkali liquor box according to the liquid level of the alkali liquor box, the limit liquid level and the set liquid level; determining a target rotating speed of the bubble pump motor according to the load condition of the bubble pump motor and the set rotating speed of the bubble pump motor under the liquid level height of the alkali liquor tank; according to the target rotating speed of the bubble suction pump motor and the opening of a flap valve of the defoaming box, the pressure in the defoaming box is regulated to eliminate foam, so that the defoaming rate is improved and the cleaning quality of the strip steel surface is improved by controlling the negative pressure stability of the defoaming box.
For example, fig. 3 is a flowchart of a control method of the defoaming process of the degreasing and cleaning machine, as a preferred embodiment, firstly, whether an automatic control start condition is provided is judged, if the automatic control condition is not provided, the continuous execution cannot be performed, after the automatic control start condition is met, the suction pump is set to a constant power mode, the suction pump is set to a fan water pump load, the rotation speed of the suction pump is set to 1000rpm when the liquid level of the lye tank (the liquid level height of the lye tank) is judged to be less than 2.0 meters, when the liquid level of the lye tank is judged to be greater than or equal to 2.0 meters, the rotation speed of the suction pump is set to 2800rpm when the liquid level of the lye tank is judged to be greater than or equal to 2.5 meters, and when the liquid level of the lye tank is less than 2.5 meters, the rotation speed of the suction pump is set to 2000rpm. Further judging whether the bubble pump is overloaded, taking the current setting of the rotation speed of the bubble pump motor as 2800rpm as an example, when the bubble pump is not overloaded, maintaining the opening degree of the pneumatic control valve and the rotation speed of 2800rpm at the moment, setting the rotation speed of the bubble pump as 2000rpm when the bubble pump is overloaded, judging whether the bubble pump is overloaded at the rotation speed, if the bubble pump is still overloaded at the rotation speed, reducing the opening degree of the pneumatic control valve by 20 percent until the bubble pump is not overloaded, and continuing the negative pressure control of the defoaming box.
In the embodiment of the disclosure, after the automatic control starting condition is met, the bubble suction pump is set to be in a constant power mode and the fan water pump load, and the defoaming box is in a negative pressure state by controlling the pressure in the defoaming box, so that the defoaming rate is improved, and the cleaning quality of the strip steel surface is improved.
Fig. 4 is a schematic structural diagram of a defoaming system of a degreasing cleaning machine according to an embodiment of the present disclosure. As shown in fig. 4, the degreasing cleaning machine defoaming system includes: the device comprises a controller 15, an alkali liquor box 1, a foam suction pump 4 connected with the alkali liquor box 1, a rotary foam suction column 6 connected with the foam suction pump 4, a foam suction pipe 2, a foam suction pipe 3, a pneumatic adjusting valve 5, a pneumatic liquid discharge pump 7, an electric control pressure reducing valve 8, a switching valve 9, an air discharge pump 10, a pneumatic unloading valve 11, a foam suction pump sealing packet 12, an air discharge pump sealing packet 13 and a flap valve 14 for driving a stepping motor; wherein, the top of the alkali liquor box 1 is provided with a foam outlet, the foam outlet is connected with the inlet of the foam suction pump 4 through a foam suction pipe 3, and the foam suction pipe is provided with a pneumatic regulating valve 5; the outlet of the foam suction pump 4 is connected with the inlet of the rotary foam removal column 6, the outlet of the rotary foam removal column 6 is connected with the foam removal box 2, and spiral blades are arranged in the rotary foam removal column; wherein, the top of the defoaming box 2 is provided with a gas phase outlet, and is connected with the alkali lye box 1 through an exhaust pump 10; the bottom of the defoaming box 2 is provided with a liquid phase outlet, and is connected with the alkali liquor box 1 through a pneumatic liquid discharge pump 7; wherein, a flap valve 14 for driving a stepping motor is arranged in the defoaming box; wherein, an electric control pressure reducing valve 8 and a switch valve 9 are sequentially arranged along the gas flow direction; a switch valve 9 and a pneumatic liquid discharge pump 7 are sequentially arranged along the liquid discharge direction; wherein, the bubble suction pump 4 is provided with a bubble suction pump sealing packet 12, and the exhaust pump 6 is provided with an exhaust pump sealing packet 13; wherein, the bubble suction pump sealing packet 12 is provided with a pneumatic unloading valve 11, and the exhaust pump sealing packet 13 is provided with a pneumatic unloading valve 11.
Wherein, the controller 15 (not shown in fig. 4) determines the target rotation speed of the bubble pump motor according to the liquid level height of the lye tank and the load condition of the bubble pump motor when the automatic control starting condition is provided by judging whether the automatic control starting condition of the degreasing cleaning mechanical defoaming system is provided; and further adjusting the pressure in the defoaming box according to the target rotating speed and the opening of a flap valve of the defoaming box, so that the defoaming box is in a negative pressure state, eliminating foam and improving the defoaming rate.
The degreasing cleaning mechanical defoaming system comprises the following working processes: foam at the upper part of the liquid level of the alkali liquor box 1 is sucked by a foam suction pump 4, suction force is regulated by the opening of a pneumatic regulating valve 5, the foam is discharged from an outlet after being accelerated by the foam suction pump 4 and enters a rotary defoaming column 6, and most of foam is broken under the action of rotary defoaming and negative pressure of the defoaming box to form air, alkali liquor and a small amount of foam; after precipitation and separation by the defoaming box 2, the liquid is discharged back to the alkali liquor box 1 by the pneumatic liquid discharge pump 7, and air and residual foam are discharged back to the alkali liquor box 1 by the air discharge pump 10, so that the defoaming process is completed.
In the disclosed embodiment, the exhaust pump 10 is set to a constant power mode operation; the exhaust pump 10 starts to operate at a set rotational speed of 2000rpm, and when the pressure in the defoaming box 2 is less than-2 bar, the rotational speed of the driving motor in the exhaust pump 10 is set to 1800rpm; when the pressure in the defoaming tank 2 is greater than-2 bar and less than 0bar, the rotation speed of the driving motor in the exhaust pump 10 is set to 2000rpm; when the pressure in the defoaming box 2 is larger than 0bar, the rotating speed of the driving motor in the exhaust pump 10 is set to 2500rpm, and if the fluctuation of the negative pressure value is larger than +/-0.5 bar at the moment, the flap valve 14 is opened for adjustment, so that the stability of the negative pressure of the defoaming box is ensured. The exhaust pump 10 is composed of a vane pump and a driving motor thereof, and the load characteristic of the driving motor is fan water pump type load.
Fig. 5 is a schematic diagram of a degreasing cleaning machine defoaming process control apparatus provided in accordance with an embodiment of the present disclosure. As shown in fig. 5, the degreasing cleaning machine defoaming process control apparatus 500 includes: a judging module 510, a determining module 520 and an adjusting module 530; the judging module 510 is configured to judge whether an automatic control starting condition is provided; the determining module 520 is configured to determine, when the automatic control starting condition is met, a target rotation speed of the bubble pump motor according to a level height of the lye tank and a load condition of the bubble pump motor; the adjusting module 530 is configured to adjust pressure in the defoaming box according to the target rotation speed of the foam suction pump motor and an opening degree of a flap valve of the defoaming box, so as to eliminate foam.
As one possible implementation of the embodiment of the present disclosure, the determining module 520 includes: a first determination unit and a second determination unit; the first determining unit is used for determining the set rotating speed of the bubble suction pump motor under the liquid level height of the alkali liquor box according to the liquid level height, the limit liquid level height and the set liquid level height of the alkali liquor box; the second determining unit is used for determining the target rotating speed of the bubble suction pump motor according to the load condition of the bubble suction pump motor and the set rotating speed of the bubble suction pump motor under the liquid level height of the alkali liquor box.
As a possible implementation manner of the embodiments of the present disclosure, the first determining unit is specifically configured to compare the liquid level height of the lye tank with the set liquid level height when the liquid level height of the lye tank is greater than or equal to the limit liquid level height; wherein the limit liquid level height is less than the set liquid level height; when the liquid level height of the alkali liquor box is larger than or equal to the set liquid level height, determining that the set rotating speed of the bubble suction pump motor is a first rotating speed under the liquid level height of the alkali liquor box.
As a possible implementation manner of the embodiment of the present disclosure, the first determining unit is specifically further configured to determine, when the liquid level height of the lye tank is smaller than the limit liquid level height, that the set rotational speed of the bubble pump motor is the second rotational speed at the liquid level height of the lye tank.
As a possible implementation manner of the embodiment of the present disclosure, the first determining unit is specifically further configured to determine, when the liquid level height of the lye tank is greater than or equal to the limit liquid level height and the liquid level height of the lye tank is less than the set liquid level height, that the set rotational speed of the bubble pump motor is the third rotational speed at the liquid level height of the lye tank.
As a possible implementation manner of the embodiment of the present disclosure, the second determining unit is specifically configured to, when the bubble pump motor is in an overload state, perform a lowering process on a set rotational speed of the bubble pump motor at a liquid level height of the lye tank, to obtain a processed rotational speed of the bubble pump motor; under the processed rotating speed, if the bubble suction pump motor is still in an overload state, adjusting the opening of a pneumatic adjusting valve connected with the alkali liquor tank and the bubble suction pump until the bubble suction pump motor is in a non-overload state; and taking the processed rotating speed as a target rotating speed of the bubble pump motor.
As a possible implementation manner of the embodiment of the present disclosure, the apparatus further includes: the system comprises a first control module, a second control module and a third control module; the first control module is used for controlling the operation of two pneumatic liquid discharge pumps connected with the defoaming box to be longer than a first liquid level threshold when the liquid level in the defoaming box is greater than a first liquid level threshold; the second control module is used for controlling one of the two pneumatic liquid discharge pumps to operate for the preset duration when the liquid level in the defoaming box is smaller than the first liquid level threshold and larger than the second liquid level threshold; and the third control module is used for controlling the two pneumatic liquid discharge pumps not to operate when the liquid level in the defoaming box is smaller than the second liquid level threshold value.
It should be noted that the foregoing explanation of the embodiment of the defoaming process control method for a degreasing and cleaning machine is also applicable to the defoaming process control device for a degreasing and cleaning machine of this embodiment, and will not be repeated here.
In the embodiment of the disclosure, whether the automatic control starting condition is provided or not is judged; when the automatic control starting condition is provided, determining the target rotating speed of the bubble suction pump motor according to the liquid level height of the alkali liquor tank and the load condition of the bubble suction pump motor; according to the target rotating speed of the bubble suction pump motor and the opening of a flap valve of the defoaming box, the pressure in the defoaming box is regulated to eliminate foam, so that the defoaming rate is improved and the cleaning quality of the strip steel surface is improved by controlling the negative pressure stability of the defoaming box.
According to embodiments of the present disclosure, the present disclosure also provides a computer device, a readable storage medium and a computer program product.
To achieve the above-described embodiments, the present disclosure also proposes a computer program product which, when executed by an instruction processor in the computer program product, performs the degreasing cleaning machine defoaming process control method as proposed in the foregoing embodiments of the present disclosure.
FIG. 6 illustrates a block diagram of an exemplary computer device suitable for use in implementing embodiments of the present disclosure. The computer device 12 shown in fig. 6 is merely an example and should not be construed as limiting the functionality and scope of use of the disclosed embodiments.
As shown in FIG. 6, the computer device 12 is in the form of a general purpose computing device. Components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, a bus 18 that connects the various system components, including the system memory 28 and the processing units 16.
Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, and a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include industry Standard architecture (Industry Standard Architecture; hereinafter ISA) bus, micro channel architecture (Micro Channel Architecture; hereinafter MAC) bus, enhanced ISA bus, video electronics standards Association (Video Electronics Standards Association; hereinafter VESA) local bus, and peripheral component interconnect (PERIPHERAL COMPONENT INTERCONNECTION; hereinafter PCI) bus.
Computer device 12 typically includes a variety of computer system readable media. Such media can be any available media that is accessible by computer device 12 and includes both volatile and nonvolatile media, removable and non-removable media.
Memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (Random Access Memory; hereinafter: RAM) 30 and/or cache memory 32. The computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from or write to non-removable, nonvolatile magnetic media (not shown in FIG. 6, commonly referred to as a "hard disk drive").
Although not shown in fig. 6, a disk drive for reading from and writing to a removable nonvolatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable nonvolatile optical disk (e.g., a compact disk read only memory (Compact Disc Read Only Memory; hereinafter CD-ROM), digital versatile read only optical disk (Digital Video Disc Read Only Memory; hereinafter DVD-ROM), or other optical media) may be provided. In such cases, each drive may be coupled to bus 18 through one or more data medium interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of the various embodiments of the disclosure.
A program/utility 40 having a set (at least one) of program modules 42 may be stored in, for example, memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods in the embodiments described in this disclosure.
The computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), one or more devices that enable a user to interact with the computer device 12, and/or any devices (e.g., network card, modem, etc.) that enable the computer device 12 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 22. Moreover, the computer device 12 may also communicate with one or more networks such as a local area network (Local Area Network; hereinafter: LAN), a wide area network (Wide Area Network; hereinafter: WAN) and/or a public network such as the Internet via the network adapter 20. As shown, network adapter 20 communicates with other modules of computer device 12 via bus 18. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with computer device 12, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processing unit 16 executes various functional applications, such as implementing the degreasing cleaning machine defoaming process control method mentioned in the foregoing embodiment, by running a program stored in the system memory 28.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
It should be noted that in the description of the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
Furthermore, the functional units in the various embodiments of the present disclosure may be integrated into one processing module, or the units may be physically present separately. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.
Claims (10)
1. A degreasing cleaning machine defoaming process control method, comprising:
judging whether the automatic control starting condition is met;
when the automatic control starting condition is provided, determining the target rotating speed of the bubble suction pump motor according to the liquid level height of the alkali liquor tank and the load condition of the bubble suction pump motor;
according to the target rotating speed of the foam suction pump motor and the opening degree of a flap valve of the foam removal box, regulating the pressure in the foam removal box to remove foam;
According to the target rotation speed of the bubble pump motor and the opening of a flap valve of the defoaming box, adjusting the pressure in the defoaming box comprises the following steps: considering the influence of parameter perturbation in the suction and exhaust rotating speed and the opening degree of the regulating valve to realize decoupling control of the suction and exhaust rotating speed and the opening degree of the regulating valve, then based on Coprime decomposition theory, selecting a free matrix and a weighting matrix, then selecting a proper actual weighting function according to the control performance requirement, and designing a robust multivariable decoupling controller, as shown in a formula (1):
Wherein, For the set value of the speed difference of the suction and exhaust motor, V is the actual value of the speed difference of the suction and exhaust motor,/>For the flap valve opening set value, M is the actual value of the flap valve opening, T V is the speed influence function, T M is the flap valve opening influence function, K Mσ is the coupling factor caused by the flap valve opening adjustment, K Vθ is the coupling effect caused by the suction and exhaust motor speed adjustment pressure, J is the Jacobian coefficient, K V is the speed difference adjustment coefficient, K M is the flap valve opening adjustment coefficient, deltaV * is the suction and exhaust motor speed variable, deltaM * is the set point of the flap valve opening adjustment amount, sigma is the defoaming box pressure, and θ is the adjustment angle of the flap valve;
Selecting a weighting function array as a diagonal array to ensure decoupling requirements of a degreasing and cleaning mechanical defoaming system, wherein the selection of a complementary sensitivity function W 3(s) is the reciprocal of a sensitivity function W 1(s):
where M is the cut-off frequency, s is the laplace factor, a is the high frequency gain, ω 1＝100rad/s,ω3 =150 rad/s.
2. The method according to claim 1, wherein determining the target rotational speed of the bubble pump motor based on the level of the lye tank and the load condition of the bubble pump motor comprises:
Determining the set rotating speed of the bubble suction pump motor under the liquid level height of the alkali liquor box according to the liquid level height of the alkali liquor box, the limit liquid level height and the set liquid level height;
And determining the target rotating speed of the bubble suction pump motor according to the load condition of the bubble suction pump motor and the set rotating speed of the bubble suction pump motor under the liquid level height of the alkali liquor tank.
3. The method according to claim 2, wherein said determining the set rotational speed of the bubble pump motor at the level of the lye tank based on the level of the lye tank, the limit level and the set level comprises:
when the liquid level height of the alkali liquor box is larger than or equal to the limit liquid level height, comparing the liquid level height of the alkali liquor box with the set liquid level height; wherein the limit liquid level height is less than the set liquid level height;
When the liquid level height of the alkali liquor box is larger than or equal to the set liquid level height, determining that the set rotating speed of the bubble suction pump motor is a first rotating speed under the liquid level height of the alkali liquor box.
4. The method according to claim 2, wherein said determining the set rotational speed of the bubble pump motor at the level of the lye tank based on the level of the lye tank, the limit level and the set level comprises:
when the liquid level height of the alkali liquor box is smaller than the limit liquid level height, determining that the set rotating speed of the bubble suction pump motor is a second rotating speed under the liquid level height of the alkali liquor box.
5. The method according to claim 2, wherein said determining the set rotational speed of the bubble pump motor at the level of the lye tank based on the level of the lye tank, the limit level and the set level comprises:
when the liquid level of the alkali liquor box is higher than or equal to the limit liquid level, and the liquid level of the alkali liquor box is lower than the set liquid level, determining that the set rotating speed of the bubble suction pump motor is a third rotating speed under the liquid level of the alkali liquor box.
6. The method according to claim 2, wherein said determining a target rotational speed of the bubble pump motor based on the load condition of the bubble pump motor and the set rotational speed of the bubble pump motor at the level of the lye tank comprises:
When the bubble suction pump motor is in an overload state, reducing the set rotating speed of the bubble suction pump motor under the liquid level height of the alkali liquor tank to obtain the processed rotating speed of the bubble suction pump motor;
under the processed rotating speed, if the bubble suction pump motor is still in an overload state, adjusting the opening of a pneumatic adjusting valve connected with the alkali liquor tank and the bubble suction pump until the bubble suction pump motor is in a non-overload state;
and taking the processed rotating speed as a target rotating speed of the bubble pump motor.
7. The method according to claim 1, wherein the method further comprises:
When the liquid level in the defoaming box is greater than a first liquid level threshold value, controlling two pneumatic liquid discharge pumps connected with the defoaming box to operate for a preset time period;
When the liquid level in the defoaming box is smaller than the first liquid level threshold and larger than the second liquid level threshold, controlling one of the two pneumatic liquid discharge pumps to operate for the preset time period;
And when the liquid level in the defoaming box is smaller than the second liquid level threshold value, controlling the two pneumatic liquid discharge pumps not to operate.
8. A degreasing cleaning machine defoaming system comprising: the device comprises a controller, an alkali liquor box, a foam suction pump connected with the alkali liquor box, a rotary defoaming column connected with the foam suction pump and a defoaming box;
the top of the alkali liquor box is provided with a foam outlet, the foam outlet is connected with the inlet of the foam suction pump through a foam suction pipe, and the foam suction pipe is provided with a pneumatic regulating valve;
the outlet of the foam suction pump is connected with the inlet of the rotary defoaming column, the outlet of the rotary defoaming column is connected with the defoaming box, and spiral blades are arranged in the rotary defoaming column;
The top of the defoaming box is provided with a gas phase outlet and is connected with the alkali liquor box through an exhaust pump; the bottom of the defoaming box is provided with a liquid phase outlet and is connected with the alkali liquor box through a pneumatic liquid discharge pump;
wherein, a flap valve used for driving a stepping motor is arranged in the defoaming box;
wherein the controller is connected to the lye tank, the bubble pump, the rotary defoaming column, and the defoaming tank, respectively, for executing the degreasing cleaning machine defoaming process control method according to any one of claims 1 to 7.
9. A degreasing cleaning machine defoaming process control apparatus, comprising:
The judging module is used for judging whether the automatic control starting condition is met;
The determining module is used for determining the target rotating speed of the bubble suction pump motor according to the liquid level height of the alkali liquor tank and the load condition of the bubble suction pump motor when the automatic control starting condition is provided;
the adjusting module is used for adjusting the pressure in the defoaming box according to the target rotating speed of the foam suction pump motor and the opening degree of a flap valve of the defoaming box so as to eliminate foam;
The adjusting module is used for: and the device is also used for adjusting the pressure in the defoaming box according to the target rotating speed of the foam suction pump motor and the opening degree of a flap valve of the defoaming box, and comprises the following components: considering the influence of parameter perturbation in the suction and exhaust rotating speed and the opening degree of the regulating valve to realize decoupling control of the suction and exhaust rotating speed and the opening degree of the regulating valve, then based on Coprime decomposition theory, selecting a free matrix and a weighting matrix, then selecting a proper actual weighting function according to the control performance requirement, and designing a robust multivariable decoupling controller, as shown in a formula (1):
Wherein, For the set value of the speed difference of the suction and exhaust motor, V is the actual value of the speed difference of the suction and exhaust motor,/>For the flap valve opening set value, M is the actual value of the flap valve opening, T V is the speed influence function, T M is the flap valve opening influence function, K Mσ is the coupling factor caused by the flap valve opening adjustment, K Vθ is the coupling effect caused by the suction and exhaust motor speed adjustment pressure, J is the Jacobian coefficient, K v is the speed difference adjustment coefficient, K M is the flap valve opening adjustment coefficient, deltaV * is the suction and exhaust motor speed variable, deltaM * is the set point of the flap valve opening adjustment amount, sigma is the defoaming box pressure, and θ is the adjustment angle of the flap valve;
Selecting a weighting function array as a diagonal array to ensure decoupling requirements of a degreasing and cleaning mechanical defoaming system, wherein the selection of a complementary sensitivity function W 3(s) is the reciprocal of a sensitivity function W 1(s):
where M is the cut-off frequency, s is the laplace factor, a is the high frequency gain, ω 1＝100rad/s,ω3 =150 rad/s.
10. The apparatus of claim 9, wherein the apparatus further comprises: the system comprises a first control module, a second control module and a third control module;
the first control module is used for controlling the operation of two pneumatic liquid discharge pumps connected with the defoaming box to be longer than a first liquid level threshold when the liquid level in the defoaming box is greater than a first liquid level threshold;
The second control module is used for controlling one of the two pneumatic liquid discharge pumps to operate for the preset duration when the liquid level in the defoaming box is smaller than the first liquid level threshold and larger than the second liquid level threshold;
And the third control module is used for controlling the two pneumatic liquid discharge pumps not to operate when the liquid level in the defoaming box is smaller than the second liquid level threshold value.
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| CN111298483A (en) * | 2020-03-05 | 2020-06-19 | 辽宁科技大学 | Unloading process control method of mechanical defoaming system for cleaning strip steel |
| CN113071024A (en) * | 2021-04-16 | 2021-07-06 | 安乡县恒达包装材料有限公司 | Method for preparing foam product by recycling waste plastic |
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