CN101837375B - Master-salve control system in rolling mill screw-down system - Google Patents
Master-salve control system in rolling mill screw-down system Download PDFInfo
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- CN101837375B CN101837375B CN200910215126XA CN200910215126A CN101837375B CN 101837375 B CN101837375 B CN 101837375B CN 200910215126X A CN200910215126X A CN 200910215126XA CN 200910215126 A CN200910215126 A CN 200910215126A CN 101837375 B CN101837375 B CN 101837375B
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Abstract
The invention relates to a master-salve control system in a rolling mill screw-down system. The master-salve control system mainly comprises a small valve and a big valve, wherein the small valve is the main valve, and the big valve is the secondary valve; the small valve is a small-flow high-precision electro-hydraulic servo valve, and connected with a screw-down cylinder by a first hydraulic control one-way valve; the small valve is provided with an electrical feedback and a spool displacement detection lead wire; the big valve is a big-flow medium-precision electro-hydraulic servo valve, and connected with the screw-down cylinder by a second hydraulic control one-way valve; the two hydraulic control one-way valves are controlled to be opened and closed by a solenoid directional control valve respectively; and a safety valve group is arranged between the small valve and the big valve and the screw-down cylinder. In the master-salve control system, the small valve ensures the precision, the big valve provides the big flow, and a master-slave control strategy that the small valve always participates in the control in the rolling process, and triggers the big valve to act when the flow is not sufficient is realized. The master-salve control system can improve the stability and yield in the rolling process, is applied to a rolling mill screw-down/upper roll gap position and rolling pressure or rolling force control system which has high requirements on precision and dynamic response, and also provides a good solution for controlling the small rolling force of soft plates and strips.
Description
Technical field
The present invention relates to the valve field, the principal and subordinate who is specifically related in a kind of down-pressing system of rolling mill controls system.
Background technology
Depress at rolling mill hydraulic/in the servo-drive system, often dispose model two servo valves identical or flow different (order of magnitude is identical); Use two identical valves of model mainly to solve the problem of excessive wear of single valve zero-bit and flow gain coupling; Two servo valves that use traffic is different are provided with to different rolling operating modes, in rolling concrete use are separately to use separately.No matter which kind of situation, the two valve precision that disposed all are in the same order of magnitude; And in roll gap or the normal control procedure of roll-force, the very little and requirements for high precision when requiring high-resolution, former being configured to satisfy all operating modes to be difficult to accomplish low discharge of required flow.
Milling train is particularly in the cold-rolling mill or the normal operation of rolling of planisher of light reduction, and it is little and require the high accuracy of inching that the flow of servo-drive system demand is depressed/gone up to hydraulic pressure, and not even stabilization can not occur vibrating.Hydraulic pressure is depressed/is gone up in the conventional configuration of servo-drive system; The selecting for use and dispose at first and to consider the being required maximum stream flow of system of valve; Operating mode such as promptly taken into account the quick-make of hydraulic pressure roll gap and open fast, this system configuration and control strategy have been sacrificed the precision and the robust stability of normal rolling operating mode.
Summary of the invention
Technical problem to be solved by this invention is: provide the principal and subordinate in a kind of down-pressing system of rolling mill to control system, to overcome the defective that the inaccessible low discharge high-resolution of existing hydraulic pressing down system in rolling mill requires.
The present invention solves the technical scheme that its technical problem adopts: mainly is made up of little valve and big valve, little valve is main, greatly valve be from, wherein: little valve is a low discharge high accuracy electrohydraulic servo valve, its through first hydraulic control one-way valve with depress cylinder and link to each other; Little valve has the electricity feedback, and has spool displacement to detect lead-in wire; Big valve is big flow medium accuracy electrohydraulic servo valve, its through second hydraulic control one-way valve with depress cylinder and link to each other; Each is opened and closed two hydraulic control one-way valves by a solenoid directional control valve control, little valve and big valve and depress and be provided with a safety valve group between the cylinder.
The present invention compared with prior art has following major advantage:
One of which. principal and subordinate's control is a key technology in the rolling mill hydraulic roll gap control system, can improve the stability of the operation of rolling, improves lumber recovery thereby improve the vertical and horizontal precision of strip.
They are two years old. combine with big flow appropriateness precision electrohydraulic servo valve with low discharge high accuracy electrohydraulic servo valve; With little valve is main, big valve be from, precision is guaranteed by little valve; Big flow is provided by big valve; Little valve is participated in control always, triggers big valve events when flow is not enough, promptly realizes principal and subordinate's control strategy of " precision in low discharge high accuracy+big flow=big flow high accuracy ".
They are three years old. can be applicable to milling train especially cold-rolling mill or planisher depress/go up in the servo-drive system; Use high-resolution low discharge servo valve to guarantee height response, high accuracy and robust stability in the normal operation of rolling, large-capacity valve provides the demand volume of higher speed and the adjustment of longer stroke.Be applicable to that the milling train with high accuracy high dynamic response requirement depresses/go up roll gap position, draught pressure or rolling Force control system.
They are four years old. and bivalve principal and subordinate control strategy, also the little roll-force control for the soft board band provides a solution.
This principal and subordinate controls in the cold rolling unit of system in configuration, the steel of band as thin as a wafer that can rolling 0.18mm; In the smooth unit of two-shipper frame of rolling IF steel, use this master-slave control method to be merely the IF steel of the rolling yield strength of 110 ton hours in roll-force as 150MPa; The lumber recovery of strip product is all very high.
Description of drawings
Fig. 1 is the structural representation that hydraulic pressure provided by the invention is depressed servo-drive system valve piece.
Among the figure: 1. first hydraulic control one-way valve; 2 low discharge high accuracy electrohydraulic servo valves; 3. safety valve group; 4. solenoid directional control valve; 5. big flow medium accuracy electrohydraulic servo valve; 6. second hydraulic control one-way valve.
The specific embodiment
Principal and subordinate in the down-pressing system of rolling mill provided by the invention controls system; Its structure is as shown in Figure 1: mainly is made up of little valve and big valve, little valve is main, greatly valve be from; Wherein: little valve is a low discharge high accuracy electrohydraulic servo valve 2, its through first hydraulic control one-way valve 1 with depress cylinder and link to each other; Little valve has the electricity feedback, and has spool displacement to detect lead-in wire.Big valve is big flow medium accuracy electrohydraulic servo valve 5, its through second hydraulic control one-way valve 6 with depress cylinder and link to each other.Two hydraulic control one-way valves are are respectively opened and closed by 4 controls of a solenoid directional control valve.Little valve and big valve and depress and be provided with a safety valve group 3 between the cylinder.
Said low discharge high accuracy electrohydraulic servo valve 2 is an existing product, and for example can adopt model is the MOOG servo valve of 760H04KOZAVCMG, or other servo valve.Its technological parameter is: flow≤10L/min; The width of cloth, phase frequency range>=150Hz; Under 7MPa pressure drop and nominal current conditions, time response≤4ms; Resolution ratio≤0.05%; Ring≤0.2% stagnates; Zero partially≤2.0%; Nonlinearity≤5.0%; Degree of asymmetry≤8.0%; Drift≤2.0% during 38 ℃ of temperature rises; Drift under ± 20% rated pressure≤1.5%; Leakage≤1.5l/min in the zero-bit under the rated pressure.
Precision electrohydraulic servo valve 5 is an existing product in the described big flow, and for example can adopt model is the MOOG servo valve of D661-4651G35, or other servo valve.Its technological parameter is: flow>=60l/min, the width of cloth, phase frequency range>=50Hz, amplitude versus frequency characte non-overshoot in resolution ratio≤0.5%, frequency range.
Two solenoid directional control valves 4 are through in the control port that is installed in two hydraulic control one-way valves, and they can adopt two position switching valves of blocking the B actuator port, with the break-make of control oil circuit.
Master-slave control method in the down-pressing system of rolling mill provided by the invention; Be to adopt the principal and subordinate's control system in the above-mentioned down-pressing system of rolling mill to realize that this method is: combining with big flow medium accuracy electrohydraulic servo valve with low discharge high accuracy electrohydraulic servo valve, is main with little valve; Big valve be from; Precision is guaranteed that by little valve big flow is provided by big valve, participates in control at the medium and small valve of the operation of rolling always; Trigger big valve events when flow is not enough, promptly realize principal and subordinate's control strategy of " precision in low discharge high accuracy+big flow=big flow high accuracy ".
Said " triggering big valve events when flow is not enough " is meant that reaching 90% o'clock of rated travel at little valve core triggers big valve events.
Master-slave control method in the down-pressing system of rolling mill provided by the invention, it depresses at milling train that the high accuracy high dynamic response requires/on application in roll gap position, draught pressure or the rolling Force control system.For example: in the cold rolling unit of rolling plate as thin as a wafer, can be rolled down to the strip steel of 0.18mm with this master-slave control method.
Master-slave control method in the down-pressing system of rolling mill provided by the invention, its application in aspect the little roll-force control of soft board band.For example: in the smooth unit of two-shipper frame of rolling IF steel, use the IF steel of the rolling yield strength of this master-slave control method, can be merely 110 ton hour ordinary production in roll-force as 150MPa.
Principal and subordinate in the above-mentioned down-pressing system of rolling mill provided by the invention controls system, it depresses at milling train that the high accuracy high dynamic response requires/on application in roll gap position, draught pressure or the rolling Force control system.For example: in the cold rolling unit of rolling plate as thin as a wafer, dispose this principal and subordinate and control system, the thick difference and the plate shape of strip product all are well controlled.
Principal and subordinate in the above-mentioned down-pressing system of rolling mill provided by the invention controls system, its application in aspect the little roll-force control of soft board band.For example: in the smooth unit of two-shipper frame of rolling IF steel, dispose this principal and subordinate and control system, the thick difference and the plate shape of strip product all are well controlled.
The course of work of the present invention is: the bivalve principal and subordinate control strategy of different accuracy and flow is applicable to that having the milling train that the high accuracy high dynamic response requires depresses/go up roll gap position, draught pressure or rolling Force control system.Depress at hydraulic pressure/in the servo-drive system running; Little valve is participated in control always; Detect in real time the displacement (electric feedback servo valve has spool displacement and detects stitch) of little valve core, when the small valve core displacement reach spool stroke 90% the time trigger big valve events and participate in control.Principal and subordinate control is main with little valve, big valve be from, precision is guaranteed that by little valve flow is provided by big valve greatly.Combine with big flow appropriateness precision electrohydraulic servo valve with low discharge high accuracy electrohydraulic servo valve, promptly realize principal and subordinate's control strategy of " precision in low discharge high accuracy+big flow=big flow high accuracy ".Little valve is controlled corresponding hydraulic control one-way valve with the oil circuit break-make of depressing cylinder by two solenoid directional control valves with big valve and is controlled, and hydraulic system is protected by the safety valve group.
Claims (11)
1. the principal and subordinate in the down-pressing system of rolling mill controls system, it is characterized in that mainly being made up of little valve and big valve, and little valve is main, greatly valve be from, wherein: little valve is a low discharge high accuracy electrohydraulic servo valve, its through first hydraulic control one-way valve with depress cylinder and link to each other; Little valve has the electricity feedback, and has spool displacement to detect lead-in wire; Big valve is big flow medium accuracy electrohydraulic servo valve, its through second hydraulic control one-way valve with depress cylinder and link to each other; Each is opened and closed two hydraulic control one-way valves by a solenoid directional control valve control, little valve and big valve and depress and be provided with a safety valve group between the cylinder.
2. the principal and subordinate in the down-pressing system of rolling mill according to claim 1 controls system, it is characterized in that the technological parameter of low discharge high accuracy electrohydraulic servo valve is: flow≤10L/min; The width of cloth, phase frequency range>=150Hz; Under 7MPa pressure drop and nominal current conditions, time response≤4ms; Resolution ratio≤0.05%; Ring≤0.2% stagnates; Zero partially≤2.0%; Nonlinearity≤5.0%; Degree of asymmetry≤8.0%; Drift≤2.0% during 38 ℃ of temperature rises; Drift under ± 20% rated pressure≤1.5%; Leakage≤1.5L/min in the zero-bit under the rated pressure.
3. the principal and subordinate in the down-pressing system of rolling mill according to claim 1 controls system; The technological parameter that it is characterized in that precision electrohydraulic servo valve in the big flow is: flow>=60L/min; The width of cloth, phase frequency range>=50Hz, amplitude versus frequency characte non-overshoot in resolution ratio≤0.5%, frequency range.
4. the master-slave control method in the down-pressing system of rolling mill is characterized in that combining with big flow medium accuracy electrohydraulic servo valve with low discharge high accuracy electrohydraulic servo valve, is main with little valve; Big valve be from; Precision is guaranteed that by little valve big flow is provided by big valve, participates in control at the medium and small valve of the operation of rolling always; Trigger big valve events when flow is not enough, promptly realize principal and subordinate's control strategy of " precision in low discharge high accuracy+big flow=big flow high accuracy "; Said little valve is a low discharge high accuracy electrohydraulic servo valve, and big valve is big flow medium accuracy electrohydraulic servo valve.
5. the master-slave control method in the down-pressing system of rolling mill according to claim 4 is characterized in that reaching 90% o'clock of rated travel at little valve core triggers big valve events.
6. the application of the master-slave control method in the said down-pressing system of rolling mill of arbitrary claim in the claim 4 to 5, it depresses at milling train that the high accuracy high dynamic response requires/on application in roll gap position or the draught pressure system.
7. the application of the master-slave control method in the said down-pressing system of rolling mill of arbitrary claim in the claim 4 to 5, its application in the rolling Force control system that the high accuracy high dynamic response requires.
8. the application of the master-slave control method in the said down-pressing system of rolling mill of arbitrary claim in the claim 4 to 5, its application in aspect the little roll-force control of soft board band.
9. the principal and subordinate in the said down-pressing system of rolling mill of arbitrary claim controls the application of system in the claim 1 to 3, it depresses at milling train that the high accuracy high dynamic response requires/on application in roll gap position or the draught pressure system.
10. the principal and subordinate in the said down-pressing system of rolling mill of arbitrary claim controls the application of system in the claim 1 to 3, its application in the rolling Force control system that the high accuracy high dynamic response requires.
11. the principal and subordinate in the claim 1 to 3 in the said down-pressing system of rolling mill of arbitrary claim controls the application of system, its application in aspect the little roll-force control of soft board band.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910215126XA CN101837375B (en) | 2009-12-24 | 2009-12-24 | Master-salve control system in rolling mill screw-down system |
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| CN200910215126XA CN101837375B (en) | 2009-12-24 | 2009-12-24 | Master-salve control system in rolling mill screw-down system |
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| CN101837375A CN101837375A (en) | 2010-09-22 |
| CN101837375B true CN101837375B (en) | 2012-07-04 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102248005B (en) * | 2011-06-17 | 2013-04-17 | 中冶南方工程技术有限公司 | Method for realizing bending and balancing of working roll by virtue of bivalve linkage closed-loop control |
| CN104043655A (en) * | 2014-06-09 | 2014-09-17 | 首钢总公司 | Hydraulic screw down system for temper mill with independent single rack and control method |
| CN111075789A (en) * | 2020-01-06 | 2020-04-28 | 北京瑞赛长城航空测控技术有限公司 | Hydraulic protection device with redundancy for electro-hydraulic servo control system |
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| US4850839A (en) * | 1987-07-14 | 1989-07-25 | Barwell International Limited | Extrusion apparatus |
| WO1999013998A1 (en) * | 1997-09-16 | 1999-03-25 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Plate thickness pressing device and method |
| CN101091968A (en) * | 2006-06-20 | 2007-12-26 | 中冶京诚工程技术有限公司 | Hydraulic pressing system of rolling mill |
| CN201086095Y (en) * | 2007-09-20 | 2008-07-16 | 攀枝花新钢钒股份有限公司 | Vertical Rolling Mill with Side Pressing Device |
| CN201221507Y (en) * | 2008-05-22 | 2009-04-15 | 上海金漾电气自动化有限公司 | Hydraulic pressing servo control apparatus |
| CN201632487U (en) * | 2009-12-24 | 2010-11-17 | 中冶南方工程技术有限公司 | Master-slave control system in rolling mill pressing system |
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2009
- 2009-12-24 CN CN200910215126XA patent/CN101837375B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4850839A (en) * | 1987-07-14 | 1989-07-25 | Barwell International Limited | Extrusion apparatus |
| WO1999013998A1 (en) * | 1997-09-16 | 1999-03-25 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Plate thickness pressing device and method |
| CN101091968A (en) * | 2006-06-20 | 2007-12-26 | 中冶京诚工程技术有限公司 | Hydraulic pressing system of rolling mill |
| CN201086095Y (en) * | 2007-09-20 | 2008-07-16 | 攀枝花新钢钒股份有限公司 | Vertical Rolling Mill with Side Pressing Device |
| CN201221507Y (en) * | 2008-05-22 | 2009-04-15 | 上海金漾电气自动化有限公司 | Hydraulic pressing servo control apparatus |
| CN201632487U (en) * | 2009-12-24 | 2010-11-17 | 中冶南方工程技术有限公司 | Master-slave control system in rolling mill pressing system |
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