CN102073294B - Rolled bar cooling automatic closed-loop control system and method - Google Patents
Rolled bar cooling automatic closed-loop control system and method Download PDFInfo
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- CN102073294B CN102073294B CN200910055132A CN200910055132A CN102073294B CN 102073294 B CN102073294 B CN 102073294B CN 200910055132 A CN200910055132 A CN 200910055132A CN 200910055132 A CN200910055132 A CN 200910055132A CN 102073294 B CN102073294 B CN 102073294B
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Abstract
The invention relates to a rolled bar cooling automatic closed-loop control system and a rolled bar cooling automatic closed-loop control method. A controller operating panel and an operational signal detector of the system are respectively connected with a first control host through two input modules; a pressure and temperature sensor is connected with the first control host through an analog-to-digital conversion module; two flow sensors are respectively connected with the first control host through a second control host and a third control host; an operational signal feedback and a pump controller are connected with the third control host; the first control host is connected with a microcomputer through a communication interface, and is respectively connected with an analog display screen, an electric controller and various function executors through an output module; and the electric controller is connected with a flow regulating executer. Through the invention, the water quantity can be automatically regulated according to temperature change of steel bars at high efficiency and high precision; the finish rolling temperature and the self tempering temperature after cooling are stable; and the uniformity of mechanical properties is high.
Description
Technical field
The invention belongs to the control technology field, particularly relate to a kind of bar and roll back cooling closed loop automatic control system and method.
Background technology
Utilize bar to roll the back waste heat bar heat-treating process is called post-rolling control cooling process again.This technology is a kind of faster technology of development in recent years, and it can be under the situation that reduces steel-making cost (adding alloying element less), thereby improves bar intensity through hot rolled rod being carried out online thermal treatment.This technology is to begin to cool down temperature and inflow temperature according to steel grade, specification, self tempering target temperature, actual measurement; Calculate and stipulate required cooling water inflow; Cool off rolling the back bar,, improve the mechanical property of bar to reach the self tempering temperature scope of regulation.In this technology, crucial link is what (foundation of closed loop automatic control model) of cooling water inflow, and this has determined whether stablizing of final controlled target.In legacy equipment, have following problem: 1) reinforcing bar is in the operation of rolling, and reasons such as, rolling rhythm instability inhomogeneous owing to heating-up temperature cause crossing of finishing temperature and cooling back self tempering temperature, cause the homogeneity of mechanical property poor.2) water yield armrest of refrigeratory is moving regulates, and efficient is lower, and low precision can not carry out water yield adjustment with the temperature variation of reinforcing bar when rolling automatically.3) two self tempering temperature check points can not reflect the Temperature Distribution situation on the reinforcing bar length on the cold bed.4) processing parameter, except that temperature, all by manual record, the no datat processing capacity.
Summary of the invention
Technical matters to be solved by this invention provides a kind of actual cooling condition according to factory, and design one cover bar rolls back control cooling closed loop automatic control system.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of bar to roll back cooling closed loop automatic control system, comprise main control system, the controller function dish; Run signal detects; Pressure, temperature sensor, flow sensor, run signal feedback; Described controller function dish detects with run signal and links to each other with first main control system through two load modules respectively; Described pressure, temperature sensor link to each other with first main control system through analog-to-digital conversion module, and two flow sensors link to each other with first main control system with the 3rd main control system through second main control system respectively, and the run signal feedback all links to each other with the 3rd main control system with water pump controller; Described first main control system links to each other with microcomputer through communication interface; Described first main control system links to each other with simulating display screen, electric controller, various function executor respectively through output module, and described electric controller and flow regulation actuator join.
Described microcomputer joins with keyboard, display, printer and data-carrier store respectively.
A kind of method of using the described a kind of bar of claim 1 to roll back cooling closed loop automatic control system comprises the following steps:
(1), confirms the forward and backward temperature expectation value of bar cooling and the corresponding basic water yield according to specification, chemical constitution, the cooling water temperature of bar;
(2) after the semi-manufacture bar gets into mm finishing mill unit; The temperature of the pyrometer continuous coverage rolled piece through being arranged on the mm finishing mill unit import; It is fed back among the main control system PLC, by the finishing temperature of main control system prediction rolled piece, the water yield and the hydraulic pressure of adjustment press water pumping plant; Main control system PLC sends instruction to the press water pumping plant, regulates opening or closing of press water electrically operated valve;
(3) through the pyrometer continuous coverage bar temp after being arranged on finishing rolling mill, before the cooling zone; It is fed back among the main control system PLC; Through bar finishing temperature measured value and predicted value are contrasted; The water yield and the hydraulic pressure of main control system real-time regulated press water pumping plant, or through guidance panel manual intervention, the real-time regulated water yield and hydraulic pressure;
(4) after bar came out from finishing rolling mill, entering was worn the water cooling district and is carried out efficiently, forces cooling, and reinforcing bar is gone up cold bed and carried out air cooling after the Double Dimension Flying Shears nibbling shear, get into the self tempering stage, and heart portion and surface temperature are reached unanimity;
(5) in the handover process of reinforcing bar on cold bed, the Temperature Feedback that is arranged on the pyrometer measurement on the cold bed is in main control system PLC, and main control system PLC calculates according to the reinforcing bar temperature that obtains; The mechanical property of prediction reinforcing bar is according to other requirement of reinforcing bar different intensity scale, through detecting the preceding temperature of bar cooling; Automatically the adjustment water yield is controlled in real time, and through detecting self tempering temperature; Revise cooling water inflow, form closed-loop control, the self tempering temperature of bar is controlled in the optimised process scope; Obtaining the high strength cast iron of same intensity rank, and with temperature curve, processing parameter real time record.
Beneficial effect
The present invention can be according to the automatic regulating pondage of the temperature variation of reinforcing bar, the efficient height, and precision is high, and finishing temperature is steady with cooling back self tempering temperature, and the homogeneity of mechanical property is good.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Among the figure: 1. Process Control System; 2. measuring instrument system; 3. data processing and production management system; 4. flow control system.
Fig. 2 is a control system arrangement plan of the present invention.
Fig. 3 is the key frame of the man-machine mutual monitoring of the present invention.
Fig. 4 is the parameter setting picture of the man-machine mutual monitoring of the present invention.
Fig. 5 is the trend rod figure picture of the man-machine mutual monitoring of the present invention.
Fig. 6 is the warning picture of the man-machine mutual monitoring of the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can do various changes or modification to the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
As shown in Figure 1, the present invention includes main control system, the controller function dish; Run signal detects; Pressure, temperature sensor, flow sensor, run signal feedback; Described controller function dish detects with run signal and links to each other with first main control system through two load modules respectively; Described pressure, temperature sensor link to each other with first main control system through analog-to-digital conversion module, and two flow sensors link to each other with first main control system with the 3rd main control system through second main control system respectively, and the run signal feedback all links to each other with the 3rd main control system with water pump controller; Described first main control system links to each other with microcomputer through communication interface; Described first main control system links to each other with simulating display screen, electric controller, various function executor respectively through output module, and described electric controller and flow regulation actuator join.Described microcomputer joins with keyboard, display, printer and data-carrier store respectively.
According to specification, chemical constitution, the cooling water temperature of bar, obtain the forward and backward temperature expectation value of bar cooling and the corresponding basic water yield automatically; After the semi-manufacture bar gets into mm finishing mill unit; The temperature of the pyrometer continuous coverage rolled piece through being arranged on the mm finishing mill unit import also feeds back in the main control PLC simultaneously; Through corresponding calculated with mathematical model, predict the finishing temperature of rolled piece, and adjust the water yield and the hydraulic pressure of press water pumping plant thus; PLC sends instruction to the press water pumping plant, regulates opening or closing of press water electrically operated valve.After being arranged on finishing rolling mill; Pyrometer continuous coverage bar temp before the cooling zone feeds back in the main control PLC simultaneously, through bar finishing temperature measured value and predicted value contrast; Bar chilling temperature mathematical model is carried out the self-adaptation adjustment; The water yield and the hydraulic pressure of real-time regulated press water pumping plant also can pass through guidance panel manual intervention, the real-time regulated water yield and hydraulic pressure simultaneously.
After bar comes out from finishing rolling mill; Entering is worn the water cooling district and is carried out efficiently, forces cooling; The rebar surface temperature is sharply reduced to below 400 ℃, and the bar list surface layer produces martensite transfor mation, forms quenched martensite; And heart portion remains austenite structure, and reinforcing bar is gone up cold bed and carried out air cooling after the Double Dimension Flying Shears nibbling shear.Because thermograde is big on the reinforcing bar cross section, heart portion heat makes superficial layer quenched martensite generation tempering transition to surface conductive; Form tempered martensite; Heart portion austenite structure forms fine pearlite and thin ferrite, gets into the self tempering stage, and heart portion and surface temperature are reached unanimity.Reinforcing bar is on cold bed in the handover process, and through Temperature Feedback that the cold bed pyrometer measures being set in main control PLC, main control PLC is calculated according to the reinforcing bar temperature that obtains; The mechanical property of prediction reinforcing bar is according to other requirement of reinforcing bar different intensity scale, through detecting the preceding temperature of bar cooling; Automatically the adjustment water yield is controlled in real time, and through detecting self tempering temperature; Revise cooling water inflow, form closed-loop control, the self tempering temperature of bar is controlled in the optimised process scope; Obtaining the high strength cast iron of same intensity rank, and with temperature curve, processing parameter real time record.Its control flow chart sees that Fig. 1, system configuration see Fig. 2.
Mathematical model
(1) cold temperature forecast mathematical model of beginning
T in the formula
2: the temperature of control cooling device porch bar;
A: constant, A=6 * 10
-8t
1ε σ/c
pρ R;
T
1: the temperature of finishing mill porch bar
(2) the given mathematical model of parameter
Temperature expectation value before the bar cooling:
T
1B＝A
K1Φ+B
K1
T in the formula
1B: temperature expectation value before the cooling/℃;
A
K1: regression parameter;
Φ: bar gauge parameter;
B
K1: constant term.
Bar cooling back temperature (self tempering temperature) expectation value:
T
3B＝A
K2Φ+B
K2C
eq+C
K2T
5
T in the formula
3B: cooling back self tempering temperature expectation value/℃.
C
Eq: carbon equivalent, C
Eq=C+Mn/6;
T
5: cooling water temperature/℃;
A
K2, B
K2, C
K2: regression parameter.
(3) bare flow is set mathematical model
Q
B＝AΦ+BT
5+G
Q in the formula
B: the basic water yield/m
3.h
-1
A, B: regression parameter;
G: constant term.
(4) water yield adjustment mathematical model
Q＝Q
B+ΔQ
1+ΔQ
2?m
3/h
Q in the formula: adjusted water yield value/m
3.h
-1
Δ Q
1: by temperature measured value T before the cooling
1Water yield adjusted value/the m of decision
3.h
-1
Δ Q
2: press self tempering temperature measured value T
3The water yield adjusted value of decision.
ΔQ
1＝A
1ΔT
1+B
1
ΔQ
2＝A
2ΔT
3+B
2
A in the formula
1, A
2: regression parameter;
B
1, B
2: correction term;
Δ T
1: the difference of temperature expectation value and measured value before the cooling, Δ T
1=T
1B-T
1
Δ T
3: the difference of cooling back self tempering temperature expectation value and measured value, Δ T
3=T
3B-T
3
Native system man-machine interaction monitoring is adopted and is ground magnificent industrial computer, Siemens WINCC6.0 monitoring software.The various signals that collect PLC show on monitored picture, and artificial parameter setting, functions such as alarm indication are arranged.Concrete function is following:
● real time position monitoring: the state of monitoring each signaling point;
● signals collecting: rotating speed of motor, the electric current of coming through the bus communication collection by frequency converter;
● the demonstration of steel temperature and control valve opening;
● the temperature curve record;
● the setting of artificial parameter;
● warning system frequency converter failure demonstration etc.
Like the key frame of Fig. 3 for the man-machine mutual monitoring of the present invention.The simulation drawing of this image display system and real time data, all data all can not artificially be changed.Main water cooler 1# motorized valve aperture, 2# motorized valve aperture, the 1# of showing sets flow, 1# actual flow, 2# setting flow, 2# actual flow, final rolling temperature, goes up cold bed temperature, water cooler roller table speed.The traversing chassis location status of water cooler, the empty action simulation of crossing roller-way and carrying roller roller-way show and manually, automatically, operation, frequency converter operation, water cooler states such as signal such as be ready to.
Fig. 4 is the parameter setting picture of the man-machine mutual monitoring of the present invention.First is a rolling parameter; Water cooler was controlled foundation automatically when these parameters were rolling automatic operations; The content that is provided with comprises that rolling specification, 1# water cooler are set flow, the 2# water cooler is set flow, finishing temperature, scale-up factor; Every scope that setting is all arranged, one of every setting all will be clicked " affirmation " key of back and confirm, otherwise should set invalid.
Above parameter is to move automatically and effective when wearing water, notes following special circumstances:
(1) in the time will walking " the empty mistake " roller-way, specification is set at " 0 ".It is meaningless to set the 1-9 numeral, is the 1-3 line during 10-14, walks 4,5 lines during 16-25, uses 6 lines more than 25, and carrying roller selection speed is automatically followed.
(2) when automatic operation during without the adjustment flow, finishing temperature is set at " 0 ", is not that " 0 " then will be according to measured temperature and design temperature relatively, the adjustment flow.
(3) adjusting ratio is set based on actual needs, is generally about 4-7, and the big more flow of numerical value is regulated the speed and changed soon more, and stability then reduces.
(4) when steel is not walked water cooler " empty cross roller-way " (not needing water flowing), start " carrying roller roller-way ",, on the compounding practice platform " the empty mistake worn water " switch is chosen " the empty mistake " position if need not cool off the time.If when needing cooling, on the operator's console " the empty mistake worn water " switch is chosen " wearing water " position.
Second portion is that 1# motorized valve aperture is set, and scope is 0-99%, and this is that aperture when manually moving is set, and will click " affirmations " key of back after the setting and confirm that motorized valve will be carried out according to setting value immediately, otherwise this setting is invalid.
Third part is that 2# motorized valve aperture is set, and scope is 0-99%, and this is that aperture when manually moving is set, and will click " affirmations " key of back after the setting and confirm that motorized valve will be carried out according to setting value immediately, otherwise this setting is invalid.
The 4th part is that roller table speed is set, and this is that water cooler roller table speed when manually moving is given, and roller-way will be according to this speed operation.Setting unit is " cel ", is set at 10.5 meter per seconds like mill speed, at this moment imports 1050 backs by " affirmation " button, accomplishes input.At this moment need on the operator's console " empty cross, wear water " switch to cooperate and accomplish, cross the roller-way operation when choosing " the empty mistake " position space-time, when selecting " wearing water ", the operation of carrying roller roller-way.
Fig. 5 is the trend rod figure picture of the man-machine mutual monitoring of the present invention.This picture shows the trend rod figure of water cooler 1# motorized valve setting aperture, the actual aperture of 1# motorized valve, 2# motorized valve setting aperture, the actual aperture of 2# motorized valve, 1# actual flow, 2# actual flow.
Fig. 6 is the warning picture of the man-machine mutual monitoring of the present invention.When there is fault in system, the fault content and the trouble spot of register system.
Claims (3)
1. a bar rolls back cooling closed loop automatic control system, comprises main control system, the controller function dish; Run signal detects; Pressure, temperature sensor, flow sensor, run signal feedback; It is characterized in that: the load module that links to each other that described controller function dish and run signal detect respectively through separately links to each other with first main control system; Described pressure, temperature sensor link to each other with first main control system through analog-to-digital conversion module, and two flow sensors link to each other with first main control system with the 3rd main control system through second main control system respectively, and the run signal feedback all links to each other with the 3rd main control system with water pump controller; Described first main control system links to each other with microcomputer through communication interface; Described first main control system links to each other with simulating display screen, electric controller, various function executor respectively through output module, and described electric controller and flow regulation actuator join.
2. a kind of bar according to claim 1 rolls back cooling closed loop automatic control system, and it is characterized in that: described microcomputer joins with keyboard, display, printer and data-carrier store respectively.
3. a method of using the described a kind of bar of claim 1 to roll back cooling closed loop automatic control system is characterized in that: comprise the following steps:
(1), confirms the forward and backward temperature expectation value of bar cooling and the corresponding basic water yield according to specification, chemical constitution, the cooling water temperature of bar;
(2) after the semi-manufacture bar gets into mm finishing mill unit; The temperature of the pyrometer continuous coverage rolled piece through being arranged on the mm finishing mill unit import; It is fed back among the main control system PLC, by the finishing temperature of main control system prediction rolled piece, the water yield and the hydraulic pressure of adjustment press water pumping plant; Main control system PLC sends instruction to the press water pumping plant, regulates opening or closing of press water electrically operated valve;
(3) through the pyrometer continuous coverage bar temp after being arranged on finishing rolling mill, before the cooling zone; It is fed back among the main control system PLC; Through bar finishing temperature measured value and predicted value are contrasted; The water yield and the hydraulic pressure of main control system real-time regulated press water pumping plant, or through guidance panel manual intervention, the real-time regulated water yield and hydraulic pressure;
(4) after bar came out from finishing rolling mill, entering was worn the water cooling district and is carried out efficiently, forces cooling, and reinforcing bar is gone up cold bed and carried out air cooling after the Double Dimension Flying Shears nibbling shear, get into the self tempering stage, and heart portion and surface temperature are reached unanimity;
(5) in the handover process of reinforcing bar on cold bed, the Temperature Feedback that is arranged on the pyrometer measurement on the cold bed is in main control system PLC, and main control system PLC calculates according to the reinforcing bar temperature that obtains; The mechanical property of prediction reinforcing bar is according to other requirement of reinforcing bar different intensity scale, through detecting the preceding temperature of bar cooling; Automatically the adjustment water yield is controlled in real time, and through detecting self tempering temperature; Revise cooling water inflow, form closed-loop control, the self tempering temperature of bar is controlled in the optimised process scope; Obtaining the high strength cast iron of same intensity rank, and with temperature curve, processing parameter real time record.
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| CN200910055132A CN102073294B (en) | 2009-07-21 | 2009-07-21 | Rolled bar cooling automatic closed-loop control system and method |
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| CN102073294B true CN102073294B (en) | 2012-10-03 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103331312B (en) * | 2013-06-26 | 2015-05-20 | 张家港联峰钢铁研究所有限公司 | Apron control box circuit for producing bar |
| CN103736740B (en) * | 2013-12-31 | 2016-01-27 | 江苏永钢集团有限公司 | A kind of roller-way control speed method of screw-thread steel rolling |
| CN108277339A (en) * | 2018-01-19 | 2018-07-13 | 山东钢铁集团日照有限公司 | A kind of heat treatment quenching process control system of steel plate |
| CN108543814B (en) * | 2018-03-27 | 2020-08-14 | 北京首钢股份有限公司 | Control method for strip steel finish rolling temperature |
| CN109675933B (en) * | 2018-12-29 | 2020-10-09 | 北京勤泽鸿翔冶金科技有限公司 | Rod water-cooling closed-loop control process method and control system |
| CN110538868A (en) * | 2019-06-28 | 2019-12-06 | 中冶华天工程技术有限公司 | Method for improving stability of product obtained after ordinary bar deformed steel bar cutting |
| CN110479776B (en) * | 2019-08-21 | 2020-11-27 | 中冶华天工程技术有限公司 | Closed-loop cooling control system and control method for rolled hot-rolled rod and wire |
| CN110883105B (en) * | 2019-11-15 | 2021-06-08 | 中冶华天工程技术有限公司 | Method for adjusting parameters of controlled cooling optimizing water tank of hot-rolled deformed steel bar in real time after rolling |
| CN117127005B (en) * | 2023-08-30 | 2024-03-19 | 山东天衢铝业有限公司 | Water cooling control system and method for on-line quenching |
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