CN110560494A - control method for preventing overflow of emulsion oil return box of continuous rolling mill - Google Patents
control method for preventing overflow of emulsion oil return box of continuous rolling mill Download PDFInfo
- Publication number
- CN110560494A CN110560494A CN201910877764.1A CN201910877764A CN110560494A CN 110560494 A CN110560494 A CN 110560494A CN 201910877764 A CN201910877764 A CN 201910877764A CN 110560494 A CN110560494 A CN 110560494A
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- liquid level
- proximity switch
- emulsion
- oil return
- control valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
Abstract
A control method for preventing an emulsion oil return box of a continuous rolling mill from overflowing comprises the following steps: (1) the liquid level meter adopts a VEGAFLEX83 rod type radar liquid level meter; (2) a fixed box is arranged at the top of the oil return box, and a liquid level control device is arranged in the fixed box body; (3) setting the induction distance of the proximity switch 4 to be 1.5cm in a control program, and switching off a signal when the induction distance exceeds 1.5 cm; when the distance between the induction head and the proximity switch is 1.5cm, the proximity switch feeds back a signal to the PLC through the LV06 cabinet, the PLC controls the opening of an electric control valve arranged on a pipeline of an emulsion oil return system to increase the opening degree of the electric control valve, so that emulsion in an oil return tank is quickly discharged, and overflow is prevented; (4) PID parameters of a proportional-integral controller of the electric control valve are respectively as follows: p =10%, I =5s, D =0 s. The invention reduces cost, improves efficiency, reduces equipment failure rate and provides an effective and stable solution for the emulsion overflow failure.
Description
Technical Field
The invention belongs to the technology of cold continuous rolling electrical automation and liquid level control.
Background
the emulsion is mainly formed by adding about 97 ~ 99% of water and about 1 ~ 3% of rolling oil into the emulsion through strong stirring, plays roles of lubricating, cooling and cleaning in the rolling process, and is generally recycled.
The emulsion system consists of the following six parts: clean oil tank system, spraying valve platform system, return oil tank system, vacuum filtration system and electromagnetic filtration system.
The process flow comprises the following steps: in general, the emulsion in the clean oil tanks 11 and 14 is pumped into a main pipeline for conveying the emulsion into the racks through 5 spraying pump motors 1, and then the emulsion injection amount required by each rack is controlled through a spraying valve table according to the process requirements. An oil collecting tray 5 is arranged below each of the 4 machine frames and the 5 machine frames and used for collecting dirty emulsion and storing the dirty emulsion in oil return tanks 7 and 9, then the dirty emulsion is pumped into vacuum filter tanks 2 and 3 through 5 oil return pump motors, dirty objects are filtered, part of iron scraps in the emulsion are adsorbed by a magnetic filter system 10, the content of the iron scraps reaches the process allowable range, the finally obtained emulsion is reusable, the flow of an oil return pipeline is adjusted by a liquid level meter 8 and a flow control valve 4, and the usage amount in the emulsion system is controlled by a pure oil tank 12 and a mixed oil tank 13.
At present, the emulsion overflow caused by out-of-control liquid level in the liquid level control of an oil return tank of an emulsion system, and then the circulation of the emulsion is stopped, and finally the emulsion is stopped.
The reasons for causing the liquid level overflow of the emulsion oil return tank mainly include the following points:
1. A sensor: the emulsion returns oil tank level gauge to use is the ultrasonic wave level gauge because on-the-spot operating mode is complicated, if: the steam in the oil tank is large, so that a large amount of water drops are attached to the surface of the probe, and measurement errors are caused.
2. valve opening degree: the outlet of the oil return tank is provided with a regulating valve for controlling the liquid outlet flow, and if the valve cannot be opened in time, the liquid level can overflow.
3. Emulsion: the emulsion used by the unit can generate certain foam (especially under the condition of just replacing the emulsion) under the action of the stirrer in the oil return tank, and the measurement of the ultrasonic liquid level meter can be influenced.
4. Volume of oil return tank: compared with the pipe diameter of an inlet and an outlet, the volume of the oil return box is smaller, the liquid level changes faster under the action of large-caliber inlet and outlet liquid, and the liquid level meter has certain response time to cause liquid level overflow.
Disclosure of Invention
in order to solve the defects in the four aspects and avoid the stop of the hot continuous rolling caused by the loss of a large amount of emulsion, the invention provides a control method for preventing the overflow of an emulsion oil return box of a continuous rolling mill.
The technical scheme of the invention is as follows: a control method for preventing an emulsion oil return box of a continuous rolling mill from overflowing comprises the following steps:
(1) The liquid level meter adopts a VEGAFLEX83 rod type radar liquid level meter;
(2) the top of the oil return box is provided with a fixed box, a liquid level control device is arranged in the fixed box body, the liquid level control device consists of a buoy, a proximity switch and an induction head, the buoy is welded at one end of a connecting rod, the other end of the connecting rod is hinged with an elastic sheet, the elastic sheet is connected with the induction head, and the proximity switch is fixedly arranged on an installation frame; the inductive head is at least 1.5cm away from the proximity switch, and the proximity switch is connected with the PLC through a lead.
(3) the induction distance of the proximity switch 4 is set to be 1.5cm in the control program, and the signal is disconnected when the induction distance exceeds 1.5 cm.
When the distance between the induction head and the proximity switch is 1.5cm, the proximity switch feeds back a signal to the PLC through the LV06 cabinet, the PLC controls the opening of an electric control valve arranged on a pipeline of an emulsion oil return system to increase the opening degree of the electric control valve, so that emulsion in an oil return tank is quickly discharged, and overflow is prevented;
(4) PID parameters of a proportional-integral controller of the electric control valve are respectively as follows: p =10%, I =5s, D =0 s.
The radar liquid level meter of the invention heightens the liquid level meter, thereby reducing the attachment of water vapor and greatly reducing the occurrence of liquid level overflow; the liquid level control device enables the liquid level meter to accurately control the liquid level. The invention has high operation stability and accurate measurement.
Drawings
FIG. 1 is a diagram of an emulsion system of an acid continuous rolling mill.
FIG. 2 is a block diagram of the liquid level control apparatus of the present invention.
Fig. 3 is a prior art (background art) emulsion level display and electrically controlled valve opening curve.
the oil return tank overflows when emulsion, and it is obvious from the curve that the current liquid level meter curve a has a measured value which is not changed for a period of time (enters a measuring blind area) for a long time, the valve opening curve b is not changed, and the emulsion is not discharged, and finally the oil return tank overflows.
Fig. 4 is a liquid level display and electrically controlled valve opening curve of the emulsion of the present invention.
It can be seen from the curve that the value of curve a displayed by the liquid level meter decreases when the opening of curve b of the valve is large, and the value of curve a of the liquid level count value increases when the opening of curve b of the valve is small. The liquid level control device plays a vital role, the buoy is floated by the emulsion, the trigger switch point is close to the switch, a signal is sent to the electric control valve, and the opening degree of the electric control valve is changed from small to large; at this time, the value of the liquid level meter is slowly changed back to the normal value, so that the overflow of the emulsion is avoided.
FIG. 5 is a flowchart of a control procedure of the present invention.
In the figure, 1, a spraying motor, 2, a first vacuum filter box, 3, a second vacuum filter box, 4, an oil return pipeline flow control valve, 5, an oil collecting tray, 6, an oil return motor, 7, a second oil return box, 8, a liquid level meter, 9, a third oil return box, 10, electromagnetic filtration, 11, a second oil purifying box, 12, a pure oil box, 13, a mixed oil box, 14, a first oil purifying box, 15, a buoy, 16, a connecting rod, 17, a fixing frame, 18, a proximity switch, 19, an induction head, 20, an elastic sheet, 21 and a mounting frame.
Detailed Description
The invention is modified in the emulsion system of the acid continuous rolling mill of Shanxi Tai Steel stainless Steel Limited company as follows.
1. Replacing the original XPS15FXZ + MR100 ultrasonic liquid level meter by a VEGAFLEX83 rod radar liquid level meter;
2. A fixed box is arranged at the top of an oil return box of the emulsion system of the rolling mill, and a liquid level control device is arranged in the fixed box body.
As shown in fig. 2, the liquid level control device comprises a float 15, a proximity switch 18 and an induction head 19, wherein the float 15 is welded at one end of a connecting rod 16, the other end of the connecting rod 16 is hinged with an elastic sheet 20, the elastic sheet 20 is connected with the induction head 19, and the proximity switch 18 is fixedly installed on an installation frame 21; the induction head 19 is at least 1.5cm away from the proximity switch 18, and the proximity switch 18 is connected with the PLC through a lead.
3. Modifying the computer program to realize the following functions:
As shown in fig. 5, the liquid level meter measures the liquid level of the oil return tank, the PLC performs judgment, and when the liquid level does not enter the dead zone of the liquid level meter, the PLC stores the opening of the electric control valve in the liquid level analog quantity register, and returns the liquid level of the oil return tank;
When the liquid level enters a blind area of the liquid level meter, the numerical value of the data register is compared with the numerical value of the comparator, when the numerical value of the data register is greater than the numerical value of the comparator, the PLC is switched to the liquid level control device, the buoy is floated by the emulsion, when the buoy rises to a specified height, the sensing head connected with the buoy acts to jack the small spring piece inside, at the moment, the proximity switch senses the action of the spring piece, the sensing lamp is on, and signals are fed back to the PLC; when a proximity switch of the liquid level control device detects a high liquid level signal, the data register directly sends the analog quantity of a proximity switch return signal 2455 dig to an electric control valve arranged on a pipeline of an emulsion oil return system, so that the opening of the electric control valve reaches 100 percent, and the function that the opening of the electric control valve is 100 percent as long as the proximity switch signal returns is realized. The emulsion in the oil return tank is quickly drained away, and overflow is prevented.
4. Modification of PID parameters of electric control valve
PID parameters of a proportional-integral controller of the electric control valve are respectively as follows: p =10%, I =5s, D =0 s. P represents a ratio; i represents the integral; d represents the differential.
Before the emulsion system of the acid continuous rolling mill of Shanxi Tai Steel stainless Steel Limited company is modified, if the concentration of the emulsion is 2.5%, the pure oil needed for preparing a box of emulsion is 160000 × 2.5%/180, about 22 barrels are needed, and if the pure oil needs 3500 yuan, 3500 × 22=77000 yuan is needed for preparing a box of oil. About 3 barrels of oil need to be replenished in one time of overflow, and 20 x 3 x 3500=21 ten thousands of oil needs to be wasted in one year according to the overflow times of the previous 20 times; the time of work error can be reduced by 10 hours in one year, the production of 120 tons of silicon steel per hour can be realized, and the cost can be reduced by 300 yuan per ton in one year: 10 x 120 x 300=36 ten thousand.
the cost is reduced all the year round after the transformation: 21+36=57 ten thousand, and can effectively reduce the loss of energy media when parking faults.
Claims (2)
1. A control method for preventing an emulsion oil return box of a continuous rolling mill from overflowing is characterized by comprising the following steps:
(1) the liquid level meter adopts a VEGAFLEX83 rod type radar liquid level meter;
(2) the top of the oil return box is provided with a fixed box, a liquid level control device is arranged in the fixed box body, the liquid level control device consists of a buoy, a proximity switch and an induction head, the buoy is welded at one end of a connecting rod, the other end of the connecting rod is hinged with an elastic sheet, the elastic sheet is connected with the induction head, and the proximity switch is fixedly arranged on an installation frame; the distance between the induction head and the proximity switch is at least 1.5cm, and the proximity switch is connected with the PLC through a lead;
(3) Setting the induction distance of the proximity switch 4 to be 1.5cm in a control program, and switching off a signal when the induction distance exceeds 1.5 cm; when the distance between the induction head and the proximity switch is 1.5cm, the proximity switch feeds back a signal to the PLC through the LV06 cabinet, the PLC controls the opening of an electric control valve arranged on a pipeline of an emulsion oil return system to increase the opening degree of the electric control valve, so that emulsion in an oil return tank is quickly discharged, and overflow is prevented;
(4) PID parameters of a proportional-integral controller of the electric control valve are respectively as follows: p =10%, I =5s, D =0 s.
2. The control method for preventing the overflow of the emulsion return tank of the continuous rolling mill as claimed in claim 1, wherein when the liquid level enters the dead zone of the liquid level meter, the numerical value of the data register is compared with the numerical value of the comparator, when the numerical value of the data register is greater than the numerical value of the comparator, the PLC is switched to the liquid level control device, the float is floated by the emulsion, when the float rises to a specified height, the sensing head connected with the float acts to jack the small spring leaf inside, and when the proximity switch senses the action of the spring leaf, the sensing lamp is on, and the signal is fed back to the PLC; when a proximity switch of the liquid level control device detects a high liquid level signal, the data register directly sends the analog quantity of a proximity switch return signal 2455 dig to an electric control valve arranged on a pipeline of an emulsion oil return system, so that the opening of the electric control valve reaches 100 percent, and the function that the opening of the electric control valve is 100 percent as long as the proximity switch signal returns is realized.
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| CN201910877764.1A CN110560494B (en) | 2019-09-17 | 2019-09-17 | Control method for preventing overflow of emulsion oil return box of continuous rolling mill |
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| CN201910877764.1A CN110560494B (en) | 2019-09-17 | 2019-09-17 | Control method for preventing overflow of emulsion oil return box of continuous rolling mill |
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| CN110560494A true CN110560494A (en) | 2019-12-13 |
| CN110560494B CN110560494B (en) | 2020-10-23 |
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Citations (9)
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| US4202193A (en) * | 1978-10-03 | 1980-05-13 | National Steel Corporation | Apparatus for controlling the concentration and stability of an emulsion |
| US4315421A (en) * | 1978-10-03 | 1982-02-16 | National Steel Corporation | Method of controlling the concentration and stability of an emulsion |
| JPS5779016A (en) * | 1980-11-05 | 1982-05-18 | Nippon Steel Corp | Supplying method for oil to rolling mill oil circulation system |
| CN104801102A (en) * | 2014-01-23 | 2015-07-29 | 宝山钢铁股份有限公司 | Cold rolling emulsion purification system |
| CN204522450U (en) * | 2015-03-14 | 2015-08-05 | 邯郸市卓立精细板材有限公司 | A kind of mill lubrication breast purifier |
| CN105108652A (en) * | 2015-07-30 | 2015-12-02 | 福耀玻璃（重庆）配件有限公司 | Water tank of offline edge grinding machine |
| CN205965123U (en) * | 2016-08-26 | 2017-02-22 | 广西柳州银海铝业股份有限公司 | Hot rolling mill emulsion purification recovery |
| CN107755438A (en) * | 2017-11-16 | 2018-03-06 | 北京京诚之星科技开发有限公司 | A kind of rolling oil system |
| CN208115222U (en) * | 2018-03-26 | 2018-11-20 | 天津忠旺铝业有限公司 | A kind of emulsion settle and separate cache box |
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2019
- 2019-09-17 CN CN201910877764.1A patent/CN110560494B/en active Active
Patent Citations (9)
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|---|---|---|---|---|
| US4202193A (en) * | 1978-10-03 | 1980-05-13 | National Steel Corporation | Apparatus for controlling the concentration and stability of an emulsion |
| US4315421A (en) * | 1978-10-03 | 1982-02-16 | National Steel Corporation | Method of controlling the concentration and stability of an emulsion |
| JPS5779016A (en) * | 1980-11-05 | 1982-05-18 | Nippon Steel Corp | Supplying method for oil to rolling mill oil circulation system |
| CN104801102A (en) * | 2014-01-23 | 2015-07-29 | 宝山钢铁股份有限公司 | Cold rolling emulsion purification system |
| CN204522450U (en) * | 2015-03-14 | 2015-08-05 | 邯郸市卓立精细板材有限公司 | A kind of mill lubrication breast purifier |
| CN105108652A (en) * | 2015-07-30 | 2015-12-02 | 福耀玻璃（重庆）配件有限公司 | Water tank of offline edge grinding machine |
| CN205965123U (en) * | 2016-08-26 | 2017-02-22 | 广西柳州银海铝业股份有限公司 | Hot rolling mill emulsion purification recovery |
| CN107755438A (en) * | 2017-11-16 | 2018-03-06 | 北京京诚之星科技开发有限公司 | A kind of rolling oil system |
| CN208115222U (en) * | 2018-03-26 | 2018-11-20 | 天津忠旺铝业有限公司 | A kind of emulsion settle and separate cache box |
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