CN104043656B - Static pressurize is utilized to test the method for dynamical roll gap hydraulic state - Google Patents
Static pressurize is utilized to test the method for dynamical roll gap hydraulic state Download PDFInfo
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- CN104043656B CN104043656B CN201310081801.0A CN201310081801A CN104043656B CN 104043656 B CN104043656 B CN 104043656B CN 201310081801 A CN201310081801 A CN 201310081801A CN 104043656 B CN104043656 B CN 104043656B
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Abstract
Present invention is disclosed a kind of method utilizing static pressurize to test dynamical roll gap hydraulic state, F1 ~ 3 rolling mill hydraulic pressure is remained on 1500 tons by the method, F4 ~ 7 rolling mill hydraulic pressure remains on 1000 tons and maintain 5 minutes, and performs process in 5 minutes: the alternate position spike detecting two oil cylinder pistons in each loop; Detect the internal leakage of oil cylinder; Detect the deflection of piston opposing cylinder.The hidden danger of the method energy Timeliness coverage frame hydraulic system existence of utilization of the present invention static pressurize test dynamical roll gap hydraulic state, improve continuous hot-rolling mill at high speed, high roll-force lower thin sheet rolling stability, method of the present invention can complete test in a short period of time, and utilize original hydraulic system, do not need to increase any hardware and drop into.
Description
Technical field
The present invention relates to hot-rolled sheet strip steel automatic control technology, particularly relate to a kind of method utilizing static pressurize to test dynamical roll gap hydraulic state.
Background technology
Precision rolling equipment conventional is at present made up of F1 ~ F7 seven frames, is hot continuous rolling unidirectional type unit.The intermediate maturity of will come from roughing mill under normal circumstances, after seven frame tandem rollings, is rolled into the target hot-rolled finished product band steel of design.Because mm finishing mill unit rolling specs is many, width is from 650mm ~ 1900mm, thickness is from 1.2mm ~ 25.4mm, mill speed is the highest simultaneously can reach 21 meter per seconds, so the hydraulic stability of milling train decide rolling smoothly whether, special in rolled sheet metal, because threading, acceleration, throwing steel speed are all quite high, once hydraulic pressure is unstable, cause roll gap generation minor variations, all can cause and occur serious steel scrap accident in mm finishing mill unit, steel scrap occurs not only to affect production capacity and causes waste product, the generation of security incident during device damage and steel scrap more seriously can be caused to dispose.
Refer to Fig. 1, prior art press down system forms primarily of with lower part: working roll 11 top is provided with backing roll 12, and the roll gap between working roll is used for the section configuration of control cincture steel 13.Depress oil cylinder 14 is responsible for the roll gap quick adjustment of little stroke, and the roll gap that mechanical press down system 15 is responsible for Long Distances regulates at a slow speed.By backpressure circuit 16, No. 1 performance loop 17, No. 2 performance loop 18 connect.
Hot-rolling mill is owing to designing deficiency and deterioration all the year round, there is larger hidden danger in the stability making unit in production thin plate specification be, add there is no dynamic hydraulic error measuring means, therefore, the online stability status of seven frames cannot be known at all, although roll gap is demarcated through zeroing before the rolling, but nominal pressure and time are all limited, current F1 ~ 3 nominal pressure is maximum 1500 tons, maximum 1000 tons of F4 ~ 7 nominal pressure, acyclic homologically trioial process is only less than 1 minutes, so, although demarcate before open rolling and think all normal, but often occur during actual rolling that roll gap sideslip causes strip running deviation and gives up between frame.Reason is that Dynamic Rolling Process one piece band steel generally wants about 2.5 minutes, roll-force is rolled down to 3500 tons from 1000 tons always, even higher, so the demarcation zeroing of static state, dynamic rolling state can be described, for this reason, must find a kind of as far as possible can be very important close to the data of rolling state during Dynamic Rolling Process, and from equipment existence conditions, find a kind of static state zeroing to confirm the method for hydraulic state, be the key solving tandem mill rolling steel scrap.
Current way is: in order to ensure milling train before open rolling by existing Method means, confirm that milling train can be produced, can only after installing new working roll, carry out static precompressed 300 tons, again milling train is rotated, top and bottom rolls is under hydraulic pressure effect, it is 1500 tons that pressure is increased to F1 ~ 3, F4 ~ 7 pressure is increased to 1000 tons, after roll gap Automatic Levelling, acyclic homologically trioial pressure unloads is zero, operative employee is according to 300 tons of roll gap both sides deviations and 1500 tons of (comprising afer bay 1000 tons) roll gap both sides deviations, carry out default open rolling first piece of roll gap, first piece of band steel threading actual conditions, adjust each frame actual deviation again.
Prior art adopts acyclic homologically trioial method, do not occur under serious Inner lets out the prerequisite of problem at hydraulic test, rolling stability can be ensured, but the Inner of hydraulic jack lets out and each hydraulic valve state does not find by acyclic homologically trioial process, to let out in original when roll-force constantly increases and hydraulic valve state is all dynamically changing, so when the hydraulic pressure of frame and static acyclic homologically trioial, state is incomparable during actual rolled band steel.
Summary of the invention
The present invention is intended to propose a kind ofly utilize without under steel state, adopt static each frame hydraulic pressure pressurize method of testing, diagnose each frame when Dynamic Rolling Process, hydraulic jack and control valve duty under simulation milling train dynamical state, find the hidden danger that frame hydraulic system exists in advance, Timeliness coverage problem points is disposed, and ensure that a kind of practical control method of continuous hot-rolling mill at high speed, high roll-force lower thin sheet rolling stability.
According to one embodiment of the invention, a kind of method utilizing static pressurize to test dynamical roll gap hydraulic state is proposed, F1 ~ 3 rolling mill hydraulic pressure is remained on 1500 tons by the method, F4 ~ 7 rolling mill hydraulic pressure remains on 1000 tons and maintain 5 minutes, and performs process in 5 minutes: the alternate position spike detecting two oil cylinder pistons in each loop; Detect the internal leakage of oil cylinder; Detect the deflection of piston opposing cylinder.
In one embodiment, the alternate position spike detecting two oil cylinder pistons in each loop comprises: the aperture of setting servo valve; Two side cylinders press down simultaneously, when one of them oil cylinder piston covers the alternate position spike that total travel measures two oil cylinder pistons, are defined as Δ h=h
ds-h
os, wherein h
dsfor transmission side oil cylinder position, h
osfor active side oil cylinder position.The judgment threshold of the alternate position spike of two oil cylinder pistons is | Δ h|≤10mm.
In one embodiment, the internal leakage detecting oil cylinder comprises: turn off check valve; Detect the decrease of roll-force.The judgment threshold of the decrease of roll-force is that the decrease of one-sided roll-force is not more than 10%, and the difference of the decrease of both sides roll-force is not more than 30% of average.
In one embodiment, in the both sides of the piston rod of each oil cylinder, position sensor is housed, the deflection of described detection piston opposing cylinder comprises: the reading reading two position sensors; The difference of comparative reading.The judgment threshold of the difference of reading is 4.5mm.
In one embodiment, in 5 minutes, the release amount ratio of both sides is no more than 10%.
The hidden danger of the method energy Timeliness coverage frame hydraulic system existence of utilization of the present invention static pressurize test dynamical roll gap hydraulic state, improve continuous hot-rolling mill at high speed, high roll-force lower thin sheet rolling stability, method of the present invention can complete test in a short period of time, and utilize original hydraulic system, do not need to increase any hardware and drop into.
Accompanying drawing explanation
Fig. 1 discloses the structure chart of press down system in prior art.
Fig. 2 discloses No. 1 loop of application hydraulic press down system of the present invention.
Fig. 3 discloses No. 2 loops of application hydraulic press down system of the present invention.
Fig. 4 discloses the flow chart of the method for utilization of the present invention static pressurize test dynamical roll gap hydraulic state.
Detailed description of the invention
For ensureing that the stability of finish rolling press down system is to guaranteeing administration measure, avoiding occurring that steel scrap etc. is vital, proposes the present invention.
Finish rolling hydraulic press down system arranges two-way oil supply system usually; be called as loop respectively; the common sparing in two loops is provided with safety unloading valve; when system pressure occurs abnormal, protection mechanical device is not damaged; the top of each frame both sides is provided with accumulator; F1 ~ F3 frame shares a system, F4 ~ F7 shares a system, arranges Accumulator arrangements respectively, and the effect of accumulator suppresses system pressure fluctuation.Roll gap data after large component analysis steel scrap, when finding large regulated quantity, the asynchronous roll gap that causes of two side cylinders is the major reason causing steel scrap extremely, for this reason, seek method and the origin cause of formation of confirmation two side cylinder synchronism, the regular validation system setting up system state amount seem cause close important.
When the present invention adopts static finishing mill hydraulic pressure pressurize method to test milling train Dynamic Rolling Process, with rolling time change, draught pressure constantly changes, the situation residing for each rolling mill hydraulic duty.The executive condition of the method for utilization of the present invention static pressurize test dynamical roll gap hydraulic state is as follows:
1) this pressurize test remains on 1500 tons at F1 ~ 3 rolling mill hydraulic pressure, F4 ~ 7 rolling mill hydraulic pressure remains on 1000 tons, and the rolled sheet metal actual roll-force that is F1 ~ 3 is generally at 2000 tons ~ about 2800 tons, F4 ~ 7 milling train is generally at 1000 tons ~ about 1700 tons.
2) the static test hydraulic pressure dwell time is set as in 5 minutes, and on regulation hydraulic pressure basis, the release amount of both sides, controls 5 minutes both sides release ratios and be no more than 10%, and our Dynamic Rolling Process one piece band steel maximum duration is 2.5 minutes, so time span is enough.
Fig. 2 discloses No. 1 loop of application hydraulic press down system of the present invention.Fig. 3 discloses No. 2 loops of application hydraulic press down system of the present invention.Apply hydraulic press down system of the present invention to be made up of transmission side valve platform 20, operation side valve platform 30 and pumping plant 40.Transmission side valve platform 20 is made up of four hydraulic control one-way valves, 21, two servo valves, 22, hand stop valve, 23, unloader, 24, No. 2 circuit controls duty valve 25.Operation side valve platform 30 is made up of four hydraulic control one-way valves, 31, two servo valves, 32, hand stop valve, 33, unloader, 34, No. 1 circuit controls duty valve 35.
Fig. 4 discloses the flow chart of the method for utilization of the present invention static pressurize test dynamical roll gap hydraulic state.As shown in Figure 4, F1 ~ 3 rolling mill hydraulic pressure is remained on 1500 tons by the method for this utilization static pressurize test dynamical roll gap hydraulic state, F4 ~ 7 rolling mill hydraulic pressure remains on 1000 tons and maintain 5 minutes, and performed process in 5 minutes:
The alternate position spike of two oil cylinder pistons in 401. each loop of detection.In one embodiment, step 401 comprises following process: the aperture of setting servo valve; And two side cylinder press down simultaneously, when one of them oil cylinder piston covers the alternate position spike that total travel measures two oil cylinder pistons, be defined as Δ h=h
ds-h
os, wherein h
dsfor transmission side oil cylinder position, h
osfor active side oil cylinder position.The judgment threshold of the alternate position spike of two oil cylinder pistons is in one embodiment | Δ h|≤10mm.
The internal leakage of 402. detection oil cylinders.In one embodiment, step 402 comprises following process: turn off check valve; And detect the decrease of roll-force.The judgment threshold of the decrease of roll-force is that the decrease of one-sided roll-force is not more than 10%, and the difference of the decrease of both sides roll-force is not more than 30% of average.
The deflection of 403. detection piston opposing cylinder.In one embodiment, in the both sides of the piston rod of each oil cylinder, position sensor is housed, the deflection that step 403 detects piston opposing cylinder comprises: the reading reading two position sensors; And the difference of comparative reading.In one embodiment, the judgment threshold of the difference of reading is 4.5mm.
In the implementation of the method, in 5 minutes, the release amount ratio of both sides is no more than 10%.
Introduce a process specifically implemented of the method for utilization of the present invention static pressurize test dynamical roll gap hydraulic state below in detail:
Use the combination in No. 1 loop, No. 2 loops, loop, No. 1 No.+2, loop ,+No. 1 loop, No. 2 loops respectively, manual given mode is adopted to set the aperture of servo valve, two side cylinders press down simultaneously, when one of them oil cylinder piston covers total travel, the difference of two cylinder piston positions is as an evaluation index of hydraulic press down system synchronism quality, is defined as Δ h=h
ds-h
os, h in formula
dsfor transmission side oil cylinder position, h
osfor active side oil cylinder position, from demand, this deviation is the smaller the better, the virtual condition of each element of system of considering, determines that control criterion is | Δ h|≤10mm.If the test result in two loops all deviation is larger, and direction is consistent, oil cylinder may have problems, if the test result deviation in a loop is less and the deviation in another loop is larger, the servo valve existing problems in the loop that deviation is large, do to confirm further by second, third point following.
The internal leakage test of oil cylinder.Concerning being pressed onto 1500 tons F1 ~ F3, F4 ~ F7 is pressed onto 1000 tons, turns off check valve, keeps 5 minutes, the criterion that the decrease of roll-force leaks as measurement oil cylinder (comprising check valve), is not more than 10% as critical value using the decrease of roll-force.In addition, the difference of the decrease of same frame both sides roll-force is no more than 30% of its average.
System leak is tested.Concerning being pressed onto 1500 tons F1 ~ F3, F4 ~ F7 is pressed onto 1000 tons, cutting system fuel feeding, and keep 5 minutes, the decrease of roll-force, as the criterion weighing system leak, is not more than 15% as critical value using the decrease of roll-force.In addition, the difference of the decrease of same frame both sides roll-force is no more than 30% of its average.
The position sensor of reflection cylinder action is equipped with in the both sides (entrance of milling train, outlet side) of each cylinder piston rod, the wearing and tearing of oil cylinder piston guidance tape and cylinder barrel can cause piston opposing cylinder deflection, the reading of two position sensors is made to occur difference, owing to depressing the restriction of the sideshake (1.5mm) of bearing dowel, this species diversity is limited, specifies maximumly to be no more than 4.5mm;
By this static pressurize flow testing, substantially, can judge rolling mill hydraulic system is in what kind of state a kind of, also the fault of hydraulic jack or system control valve can be determined, by pressurize test again after relevant treatment, whether confirmation problem solves, finally realizes the object that Dynamic Rolling Process stability controls.
To do F1, No. 1 loop pressurize test:
When after pressure to 1500 ton, electric panel room provides signal, by servo valve 22 zero dead stop in No. 1 loop, the servo valve 32 in No. 2 loops be opened to the duty valve 25 in-100%, No. 1 loop electric, by No. 1 circuit operation side and transmission side totally four check valves 21 open.Duty valve 35 dead electricity in No. 2 loops, by No. 2 circuit operation sides and transmission side totally four check valve 31 valves close.After above action completes, start to record 5 minutes release results.
The analysis of release result:
The loop release of No. 1, the same side is fast, and No. 2 loops are normal, be then judged as that No. 2 loop check valves 31 close not dead.
As the equal release in loop of No. 1, both sides is fast, and pressure relief value is suitable, be then judged as that No. 2 return circuit valves 35 are abnormal.
Loop, No. 1, the same side and No. 2 equal releases in loop fast, but pressure relief value difference is large, be then judged as that No. 1 loop check valve 21 and No. 2 loop check valves 31 all close not dead.
Loop, No. 1, the same side and No. 2 equal releases in loop fast, but pressure relief value is suitable, be then judged as that Manual relief valve 23(transmission side is 33), safety valve 24(transmission side is 34) and one of depress oil cylinder 14 have leakage.
The hidden danger of the method energy Timeliness coverage frame hydraulic system existence of utilization of the present invention static pressurize test dynamical roll gap hydraulic state, improve continuous hot-rolling mill at high speed, high roll-force lower thin sheet rolling stability, method of the present invention can complete test in a short period of time, and utilize original hydraulic system, do not need to increase any hardware and drop into.
Claims (8)
1. the method utilizing static pressurize to test dynamical roll gap hydraulic state, for in finish rolling hydraulic press down system, finish rolling hydraulic press down system arranges two-way oil supply system, be called two loops, it is characterized in that, F1 ~ 3 rolling mill hydraulic pressure is remained on 1500 tons by the method, F4 ~ 7 rolling mill hydraulic pressure remains on 1000 tons and maintain 5 minutes, and performs following process in 5 minutes:
Detect the alternate position spike of two oil cylinder pistons in each loop;
Detect the internal leakage of oil cylinder;
Detect the deflection of piston opposing cylinder.
2. utilize static pressurize to test the method for dynamical roll gap hydraulic state as claimed in claim 1, it is characterized in that, in each loop of described detection, the alternate position spike of two oil cylinder pistons comprises:
The aperture of setting servo valve;
Two side cylinders press down simultaneously, when one of them oil cylinder piston covers the alternate position spike that total travel measures two oil cylinder pistons, are defined as Δ h=h
ds-h
os, wherein h
dsfor transmission side oil cylinder position, h
osfor active side oil cylinder position.
3. utilize static pressurize to test the method for dynamical roll gap hydraulic state as claimed in claim 2, it is characterized in that, the judgment threshold of the alternate position spike of two oil cylinder pistons is | Δ h|≤10mm.
4. utilize static pressurize to test the method for dynamical roll gap hydraulic state as claimed in claim 1, it is characterized in that, the internal leakage detecting oil cylinder comprises:
Turn off check valve;
Detect the decrease of roll-force.
5. utilize static pressurize to test the method for dynamical roll gap hydraulic state as claimed in claim 4, it is characterized in that, the judgment threshold of the decrease of roll-force is that the decrease of one-sided roll-force is not more than 10%, and the difference of the decrease of both sides roll-force is not more than 30% of average.
6. utilize static pressurize to test the method for dynamical roll gap hydraulic state as claimed in claim 1, it is characterized in that, in the both sides of the piston rod of each oil cylinder, position sensor is housed, the deflection of described detection piston opposing cylinder comprises:
Read the reading of two position sensors;
The difference of comparative reading.
7. utilize static pressurize to test the method for dynamical roll gap hydraulic state as claimed in claim 6, the judgment threshold of the difference of described reading is 4.5mm.
8. utilize static pressurize to test the method for dynamical roll gap hydraulic state as claimed in claim 1, it is characterized in that, in 5 minutes, the release amount ratio of both sides is no more than 10%.
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| CN106286474B (en) * | 2015-06-08 | 2018-03-20 | 佛山市恒力泰机械有限公司 | A kind of leakage automatic judging method of ceramic brick press hydraulic pressurization element |
| AT518268B1 (en) | 2016-05-31 | 2017-09-15 | Avl List Gmbh | Method and system for diagnosing and / or controlling a reciprocating engine with a variable compression ratio |
| AT518694B1 (en) | 2016-05-31 | 2019-08-15 | Avl List Gmbh | Reciprocating piston engine and method and apparatus for diagnosis and / or control of a reciprocating engine |
| CN108213090B (en) * | 2017-12-29 | 2019-10-25 | 武汉钢铁有限公司 | A kind of finishing mill acyclic homologically trioial method |
| CN111872133B (en) * | 2020-08-03 | 2022-03-15 | 华峰铝业有限公司 | Metal composite material bonding rolling method for improving defects of air bubbles and leather material deviation |
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| JPS59153509A (en) * | 1983-02-18 | 1984-09-01 | Nippon Steel Corp | Detection of roll gap in vertical rolling mill |
| JPS6120608A (en) * | 1984-07-09 | 1986-01-29 | Nippon Steel Corp | Method for determining reference point of roll gap |
| CN1062483A (en) * | 1991-12-21 | 1992-07-08 | 冶金工业部钢铁研究总院 | The establishing method of Medium and Heavy Plate Rolling gap values between rollers |
| CN101979184A (en) * | 2010-11-23 | 2011-02-23 | 田陆 | Control method and system for dynamic soft reduction of continuous casting machine, and continuous casting machine |
| CN102553911A (en) * | 2012-02-08 | 2012-07-11 | 中冶赛迪工程技术股份有限公司 | Full-hydraulic roll gap adjusting short-stress-path rolling mill |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59153509A (en) * | 1983-02-18 | 1984-09-01 | Nippon Steel Corp | Detection of roll gap in vertical rolling mill |
| JPS6120608A (en) * | 1984-07-09 | 1986-01-29 | Nippon Steel Corp | Method for determining reference point of roll gap |
| CN1062483A (en) * | 1991-12-21 | 1992-07-08 | 冶金工业部钢铁研究总院 | The establishing method of Medium and Heavy Plate Rolling gap values between rollers |
| CN101979184A (en) * | 2010-11-23 | 2011-02-23 | 田陆 | Control method and system for dynamic soft reduction of continuous casting machine, and continuous casting machine |
| CN102553911A (en) * | 2012-02-08 | 2012-07-11 | 中冶赛迪工程技术股份有限公司 | Full-hydraulic roll gap adjusting short-stress-path rolling mill |
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