CN111001322A - Method for mixing leveling liquid in water feed pump of wet leveling system - Google Patents
Method for mixing leveling liquid in water feed pump of wet leveling system Download PDFInfo
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- CN111001322A CN111001322A CN201911308740.0A CN201911308740A CN111001322A CN 111001322 A CN111001322 A CN 111001322A CN 201911308740 A CN201911308740 A CN 201911308740A CN 111001322 A CN111001322 A CN 111001322A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/49—Mixing systems, i.e. flow charts or diagrams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/405—Methods of mixing liquids with liquids
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Abstract
The invention discloses a method for mixing leveling liquid in a water feeding pump of a wet leveling system, which comprises a mixing tank, a water feeding pump connected with the mixing tank, a raw liquid tank and a raw liquid pump connected with the raw liquid tank, wherein the water feeding pump is connected with the mixing tank through a water inlet pipeline; the invention adopts a mode of 'taking and using the stock solution immediately', the stock solution is directly injected into the water feeding pump for mixing, and the mixed solution is immediately output to the frame of the temper mill for spraying, thereby avoiding the phenomenon that the mixed solution in the traditional mixing tank deteriorates when the mixed solution is at a high temperature for a long time; the concentration of the mixed liquid can be changed rapidly.
Description
Technical Field
The invention relates to the technical field of wet leveling systems, in particular to a method for mixing leveling liquid in a water supply pump of a wet leveling system.
Background
The wet leveling system is widely applied to a leveling machine of a processing line and has the function of cleaning the surfaces of rollers and strip steel to reduce the surface defects of the strip steel; the service life of the roller can be prolonged, and the roller changing times can be reduced; while facilitating elongation control.
The mixed mode of wet leveling system leveling liquid at present generally adopts is that the blending in the blending tank mixes, and the advantage of this mode is that the stability of mixed liquid concentration is good, but also has the phenomenon that mixed liquid goes bad because of the higher mixed liquid of long-time storage temperature simultaneously, and it is also that the blending tank volume is great, changes the mixed liquid concentration in the water supply pipe and needs the shortcoming such as time is longer.
The invention aims to provide a method for mixing leveling liquid in a water feeding pump of a wet leveling system aiming at the defects of the prior art, which realizes the separate storage of stock solution and desalted water, a mixing tank is only used for storing desalted water, the original mixing tank is not used for mixing the stock solution and the desalted water, and the phenomenon that the mixed solution stored in the original mixing tank for a long time is deteriorated when the temperature is higher is avoided. Meanwhile, the stock solution is taken as required and directly injected into a water inlet pipe of a water feeding pump, so that the time for adjusting the concentration of the mixed solution is shortened.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for mixing leveling liquid in a feed pump of a wet leveling system.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for mixing leveling liquid in a water feeding pump of a wet leveling system comprises a mixing tank, a water feeding pump connected with the mixing tank, a raw liquid tank and a raw liquid pump connected with the raw liquid tank, wherein the water feeding pump is connected with the mixing tank through a water inlet pipeline, the water inlet pipeline of the water feeding pump is also connected with a water outlet pipeline of the raw liquid pump and is provided with a second electromagnetic valve for mixing desalted water and the raw liquid in the water feeding pump, the water outlet pipeline of the raw liquid pump is connected with the mixing tank and is provided with a first electromagnetic valve for mixing the desalted water and the raw liquid in the mixing tank, the water outlet pipeline of the water feeding pump is sequentially connected with a conductivity tester, a pressure gauge, a flow meter and a flat machine frame water feeding pipe, the water feeding pump, the pressure gauge and the flow meter are electrically connected with a first PI controller to form pressure closed-loop feedback control, the raw liquid pump and the conductivity tester are electrically connected, the HMI is provided with two mixing modes of mixing in the mixing tank and mixing in the water feeding pump;
the closed-loop feedback control of the concentration is that the deviation between an input concentration set value on the HMI and the actual concentration controls the rotating speed of the raw liquid pump so as to control the flow of the raw liquid, the rotating speed of the raw liquid pump is increased when the actual concentration is lower than the set concentration, the rotating speed of the raw liquid pump is reduced when the actual concentration is higher than the set concentration, and the actual concentration of the mixed liquid in the water supply pipe is obtained according to the functional relation between the conductivity and the concentration at the corresponding temperature by the conductivity measured by the conductivity detector;
the pressure closed-loop feedback control is to control the rotating speed of a water feeding pump according to the deviation of the water feeding pressure and the actual pressure required by the current working condition of the temper mill, the system automatically increases the rotating speed of the water feeding pump when the actual pressure is lower than the set pressure, the system automatically reduces the rotating speed of the water feeding pump when the actual pressure is higher than the set pressure, the flow required by the current working condition is obtained by calculation according to the speed of strip steel in the region of the temper mill, the width of a nozzle occupied by the strip steel and the humidity of the strip steel, and the pressure required by the target flow is obtained according to the functional relation between the flow and the pressure in the water feeding pipe of the stand of.
Specifically, the mixing mode in the feed pump is that the first electromagnetic valve is closed, the second electromagnetic valve is opened, and the stock solution is directly injected into a feed pump water inlet pipeline.
Specifically, the mixing mode in the mixing tank is that the first electromagnetic valve is opened, and the second electromagnetic valve is closed, so that the desalted water and the stock solution are mixed in the mixing tank.
Specifically, the feed pump adopts two frequency conversion centrifugal pumps, one centrifugal pump is a working pump, the other centrifugal pump is a standby pump, the system works in an automatic mode, and the standby pump is automatically switched to be used as the working pump when the working pump breaks down.
Specifically, the raw liquid pump is a variable-frequency control metering pump, the metering pump adopts two variable-frequency screw pumps, one screw pump is a working pump, the other screw pump is a standby pump, and the system works in an automatic mode, and the standby pump is automatically switched to be used as the working pump when the working pump fails.
Specifically, a thermometer, a heater, a liquid level meter and a stirrer are arranged in the mixing tank, and a water inlet pipeline of the mixing tank is provided with a water replenishing valve.
Specifically, a liquid level meter is arranged in the raw liquid tank, and a liquid feeding valve is arranged on a liquid inlet pipeline of the raw liquid tank.
The invention has the following beneficial effects:
the method for mixing the leveling liquid in the water feeding pump of the wet leveling system adopts a mode of taking and using the stock solution immediately, the stock solution is directly injected into the water feeding pump for mixing, and the mixed liquid is immediately output to the frame of the leveling machine for spraying, so that the phenomenon that the mixed liquid is deteriorated when the temperature in the mixing tank is high for a long time under the mixed mode in the traditional mixing tank is avoided; the designed concentration closed-loop feedback control and pressure closed-loop feedback control realize the rapid change of the concentration of the mixed liquid, and the mixed liquid in the traditional mixed tank cannot change the concentration of the mixed liquid on the side of the temper mill frame in a short time because the capacity of the mixed tank is large.
Drawings
FIG. 1 is a block diagram of the structure of a mixed leveling liquid in a feed pump of a wet leveling system;
FIG. 2 is a block diagram showing the structure of the mixed leveling liquid in the feed pump and the mixing tank of the wet leveling system;
Detailed Description
The technical solutions in the embodiments of the present invention will be described in further detail in the following clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1-2, the method for mixing the leveling liquid in the water feeding pump of the wet leveling system comprises a mixing tank, a water feeding pump connected with the mixing tank, a raw liquid tank and a raw liquid pump connected with the raw liquid tank, wherein the water feeding pump is connected with the mixing tank through a water inlet pipeline, the water inlet pipeline of the water feeding pump is also connected with a water outlet pipeline of the raw liquid pump and is provided with a second electromagnetic valve, is used for mixing desalted water and stock solution in a water feeding pump, a water outlet pipeline of the stock solution pump is connected with a mixing tank and is provided with a first electromagnetic valve, the system comprises a mixing tank, a water outlet pipeline of a water feeding pump, a conductivity tester, a pressure gauge, a flowmeter and a water feeding pipe of a complete machine frame, wherein the water feeding pump, the pressure gauge and the flowmeter are sequentially connected with a first PI controller to form pressure closed loop feedback control, the raw material pump and the conductivity tester are electrically connected with a second PI controller to form concentration closed loop feedback control, and the first PI controller and the second PI controller are electrically connected with an HMI. The HMI is provided with two mixing modes of mixing in the mixing tank and mixing in the water feeding pump, the mixing mode in the water feeding pump is that the first electromagnetic valve is closed, the second electromagnetic valve is opened, and stock solution is directly injected into a water inlet pipeline of the water feeding pump; the mixing mode in the mixing tank is that the first electromagnetic valve is opened, and the second electromagnetic valve is closed, so that the desalted water and the stock solution are mixed in the mixing tank. The water supply pump adopts two frequency conversion centrifugal pumps, one centrifugal pump is a working pump, the other centrifugal pump is a standby pump, the system works in an automatic mode, and the standby pump is automatically switched to be used as the working pump when the working pump breaks down. The raw liquid pump is a metering pump controlled by frequency conversion, the metering pump adopts two frequency conversion screw pumps, one screw pump is a working pump, the other screw pump is a standby pump, the system works in an automatic mode, and the standby pump is automatically switched to be used as the working pump when the working pump fails.
As shown in figure 1, the stock solution is not injected into the mixing tank, the mixing tank is only used for storing desalted water, the stock solution is directly injected into a water inlet pipe of a water feeding pump of the wet leveling system by a stock solution pump, the water inlet pipe of the water feeding pump is provided with two branches, one branch is connected with a water outlet pipe of the mixing tank, the other branch is connected with a water outlet pipe of the stock solution pump, the stock solution pump is started when the water feeding pump is started, so that the desalted water and the stock solution are mixed in the water feeding pump, and the well-mixed leveling solution is output to a rack of the leveling machine through the water feeding pipe and is sprayed out to a support roller, a working roller and.
As shown in fig. 2, the output pipeline of the on-site raw liquid pump is divided into two parts, one part is connected with the water inlet pipeline of the water feeding pump, and the other part is connected with the mixing tank so as to keep the original commonly adopted mode of mixing in the mixing tank. When the leveling liquid water-feeding pump internal mixing method is used, the first electromagnetic valve on the branch pipeline of the injection mixing tank is closed, and the second electromagnetic valve on the branch pipeline of the water-feeding pump water inlet pipeline is opened, so that the raw liquid can directly flow to the water-feeding pump to realize the internal mixing of the water-feeding pump.
The precondition for starting the invention is that: the HMI sets the whole wet leveling system to be in a full-automatic mode; inputting a set value of the surface humidity of the strip steel and a set value of the concentration of the mixed liquid on the HMI; "mix in feed pump" is selected on HMI. The set value of the surface humidity of the strip steel is used for calculating the flow required by spraying on the side of the frame together with the width of the nozzle occupied by the strip steel and the speed of the strip steel. The mixed liquor concentration set value is the mixed liquor concentration required by the process and is used for the set value of closed-loop feedback control of the concentration. Selecting "mix in feed pump" will close solenoid valve one in fig. 2 and open solenoid valve two in fig. 2, connecting the outlet pipe of the raw liquid pump to the inlet pipe of the feed pump.
The concentration closed-loop feedback control is that the rotating speed of the raw liquid pump is controlled according to the deviation between the concentration set value input by an operator on the HMI and the actual concentration, so as to control the flow rate of the raw liquid, the rotating speed of the raw liquid pump is increased when the actual concentration is lower than the set concentration, and the rotating speed of the raw liquid pump is reduced when the actual concentration is higher than the set concentration. The conductivity measured by the conductivity detector on the water supply pipe obtains the actual concentration of the mixed liquid in the water supply pipe according to the function relation between the conductivity and the concentration at the corresponding temperature.
The pressure closed loop feedback control is that the rotating speed of the water feeding pump is controlled according to the deviation between the water feeding pressure required by the current working condition of the temper mill and the actual pressure, the rotating speed of the water feeding pump is automatically increased by the system when the actual pressure is lower than the set pressure, and the rotating speed of the water feeding pump is automatically reduced by the system when the actual pressure is higher than the set pressure. The flow required by the current working condition is calculated according to the speed of strip steel in the temper mill area, the width of a nozzle occupied by the strip steel and the humidity of the strip steel, and the pressure required by the target flow can be obtained according to the functional relation between the flow and the pressure in the water supply pipeline, namely the pressure set value in the pressure closed-loop control.
The mixing tank is internally provided with a thermometer, a heater, a liquid level meter and a stirrer, and a water inlet pipeline of the mixing tank is provided with a water replenishing valve. The temperature control realizes the automatic control of the temperature by starting and stopping the heater through the actual temperature under the automatic mode of the system. The liquid level meter and the water replenishing valve realize the automatic adjustment of the liquid level of the mixing tank in an automatic system mode, the water replenishing valve is automatically opened when the liquid level is low, and the water replenishing valve is automatically closed when the normal liquid level is reached, wherein the water replenishing valve is shown in figure 2. The stirrer ensures that the temperature distribution of the desalted water is uniform, and avoids the phenomenon that the temperature of other areas is lower due to overheating near the heater, thereby ensuring the accuracy of the concentration of the mixed liquid in the water feeding pump.
A liquid level meter is arranged in the raw liquid tank, a liquid inlet pipeline of the raw liquid tank is provided with a liquid supplementing valve, when the system is in an automatic mode, the liquid supplementing valve is automatically opened when the liquid level is low, and the liquid supplementing valve is automatically closed when the normal liquid level is reached, and is shown in figure 2. When the wet leveling system works in an automatic mode and the speed of a production line in a leveling machine area is more than 0m/min, the wet leveling system automatically operates, and a mode of mixing leveling liquid in a water supply pump is activated.
When the equipment is operated, the whole wet leveling system is selected to be in an automatic mode on the HMI, and a liquid supplementing valve of the stock solution tank automatically supplements stock solution according to the liquid level of the stock solution tank in the automatic mode; the water replenishing valve of the mixing tank automatically replenishes desalted water according to the liquid level in the mixing tank in an automatic mode; the heater in the mixing tank is automatically started and stopped in an automatic mode according to the temperature of desalted water in the tank, so that the constant water temperature is ensured, and the stability of the concentration of the mixed leveling liquid is ensured; the raw liquid pump is a metering pump controlled by frequency conversion, and closed-loop feedback control is performed according to the measured real-time concentration in an automatic mode; the feed pump is a variable frequency pump, and closed-loop feedback control is carried out according to the water pressure of a real-time feed pipe in an automatic mode, so that the control of the spraying flow of the rack area of the temper mill is indirectly realized.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (7)
1. A method for mixing leveling liquid in a water feeding pump of a wet leveling system is characterized by comprising a mixing tank, a water feeding pump connected with the mixing tank, a raw liquid tank and a raw liquid pump connected with the raw liquid tank, wherein the water feeding pump is connected with the mixing tank through a water inlet pipeline, the water inlet pipeline of the water feeding pump is also connected with a water outlet pipeline of the raw liquid pump and is provided with a second electromagnetic valve for mixing desalted water and the raw liquid in the water feeding pump, the water outlet pipeline of the raw liquid pump is connected with the mixing tank and is provided with a first electromagnetic valve for mixing the desalted water and the raw liquid in the mixing tank, the water outlet pipeline of the water feeding pump is sequentially connected with a conductivity meter, a pressure meter, a flow meter and a water feeding pipe of a leveling machine frame, the water feeding pump, the pressure meter and the flow meter are electrically connected with a first PI controller to form pressure closed-loop feedback control, the raw liquid pump and the conductivity meter are electrically, the HMI is provided with two mixing modes of mixing in the mixing tank and mixing in the water feeding pump;
the closed-loop feedback control of the concentration is that the deviation between an input concentration set value on the HMI and the actual concentration controls the rotating speed of the raw liquid pump so as to control the flow of the raw liquid, the rotating speed of the raw liquid pump is increased when the actual concentration is lower than the set concentration, the rotating speed of the raw liquid pump is reduced when the actual concentration is higher than the set concentration, and the actual concentration of the mixed liquid in the water supply pipe is obtained according to the functional relation between the conductivity and the concentration at the corresponding temperature by the conductivity measured by the conductivity detector;
the pressure closed-loop feedback control is to control the rotating speed of a water feeding pump according to the deviation of the water feeding pressure and the actual pressure required by the current working condition of the temper mill, the system automatically increases the rotating speed of the water feeding pump when the actual pressure is lower than the set pressure, the system automatically reduces the rotating speed of the water feeding pump when the actual pressure is higher than the set pressure, the flow required by the current working condition is obtained by calculation according to the speed of strip steel in the region of the temper mill, the width of a nozzle occupied by the strip steel and the humidity of the strip steel, and the pressure required by the target flow is obtained according to the functional relation between the flow and the pressure in the water feeding pipe of the stand of.
2. The method of claim 1, wherein the mixing mode in the feed pump is solenoid-off, solenoid-on, and the feed pump feed line is directly filled with the feed liquid.
3. The method of claim 1, wherein the mixing mode in the mixing tank is solenoid-on and solenoid-off for mixing the desalted water and the stock solution in the mixing tank.
4. The method for mixing the leveling liquid in the water feeding pump of the wet leveling system as recited in claim 1, wherein the water feeding pump is two variable frequency centrifugal pumps, one centrifugal pump is a working pump, the other centrifugal pump is a backup pump, and the system operates in an automatic mode, and the backup pump is automatically switched to be the working pump when the working pump fails.
5. The method of claim 1, wherein the raw liquid pump is a variable frequency controlled metering pump, two variable frequency screw pumps are used as the metering pump, one screw pump is a working pump, the other screw pump is a backup pump, and the system operates in an automatic mode, and the backup pump is automatically switched to be the working pump when the working pump fails.
6. The method of claim 1, wherein a thermometer, a heater, a level gauge, and a blender are disposed in the mixing tank, and a water inlet pipe of the mixing tank is provided with a water replenishment valve.
7. The method of claim 1, wherein a level gauge is provided in the feed tank and a feed line of the feed tank is provided with a feed valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911308740.0A CN111001322A (en) | 2019-12-18 | 2019-12-18 | Method for mixing leveling liquid in water feed pump of wet leveling system |
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| CN201911308740.0A CN111001322A (en) | 2019-12-18 | 2019-12-18 | Method for mixing leveling liquid in water feed pump of wet leveling system |
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| CN111001322A true CN111001322A (en) | 2020-04-14 |
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| CN201911308740.0A Pending CN111001322A (en) | 2019-12-18 | 2019-12-18 | Method for mixing leveling liquid in water feed pump of wet leveling system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115805662A (en) * | 2022-11-22 | 2023-03-17 | 中铁十八局集团有限公司 | Automatic preparation system for mixed liquid for shield construction |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06190427A (en) * | 1992-12-25 | 1994-07-12 | Kawasaki Steel Corp | Device for supplying rolling oil |
| CN101433812A (en) * | 2008-12-04 | 2009-05-20 | 中国重型机械研究院 | Wet flattening turbulent current real time liquor-mixing system |
| CN202015742U (en) * | 2010-12-30 | 2011-10-26 | 一重集团大连设计研究院有限公司 | Leveling liquid system of cold-rolling leveling machine |
| CN106000146A (en) * | 2016-05-27 | 2016-10-12 | 慈颂（上海）环保科技有限公司 | Online liquid polymer preparation system |
-
2019
- 2019-12-18 CN CN201911308740.0A patent/CN111001322A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06190427A (en) * | 1992-12-25 | 1994-07-12 | Kawasaki Steel Corp | Device for supplying rolling oil |
| CN101433812A (en) * | 2008-12-04 | 2009-05-20 | 中国重型机械研究院 | Wet flattening turbulent current real time liquor-mixing system |
| CN202015742U (en) * | 2010-12-30 | 2011-10-26 | 一重集团大连设计研究院有限公司 | Leveling liquid system of cold-rolling leveling machine |
| CN106000146A (en) * | 2016-05-27 | 2016-10-12 | 慈颂（上海）环保科技有限公司 | Online liquid polymer preparation system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115805662A (en) * | 2022-11-22 | 2023-03-17 | 中铁十八局集团有限公司 | Automatic preparation system for mixed liquid for shield construction |
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Application publication date: 20200414 |
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