CN104043656A - Method for testing hydraulic state of dynamic roll gaps through static pressure maintaining - Google Patents
Method for testing hydraulic state of dynamic roll gaps through static pressure maintaining Download PDFInfo
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- CN104043656A CN104043656A CN201310081801.0A CN201310081801A CN104043656A CN 104043656 A CN104043656 A CN 104043656A CN 201310081801 A CN201310081801 A CN 201310081801A CN 104043656 A CN104043656 A CN 104043656A
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Abstract
The invention discloses a method for testing the hydraulic state of dynamic roll gaps through static pressure maintaining. According to the method, the hydraulic pressure of F1-3 rolling mills is maintained to be 1500t for 5 minutes, the hydraulic pressure of F4-7 rolling mills is maintained to be 1000t for 5 minutes, and in addition, a next process is executed in 5 minutes: the position differences of two oil cylinder pistons in each loop are detected; internal leakage of oil cylinders is detected; the inclination of the pistons relative to cylinder bodies is detected. The method for testing the hydraulic state of the dynamic roll gaps through static pressure maintaining has the advantages that the hidden danger of a machine frame hydraulic system can be found in time, and the thin plate rolling stability of heat continuous rolling mills at high speed and high rolling force can be improved. The method provided by the invention can be used for completing the test in a short time, in addition, the original hydraulic system is utilized, and the addition of any hardware investment is not needed.
Description
Technical field
The present invention relates to hot-rolled sheet strip steel automatic control technology, relate in particular to a kind of method of utilizing static pressurize to test dynamic roll gap hydraulic state.
Background technology
Conventional precision rolling equipment is comprised of seven frames of F1～F7 at present, is hot continuous rolling unidirectional type unit.Generally, by the middle finished product of coming from roughing mill, after seven frame tandem rollings, be 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 determining rolling smoothly whether, especially when 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 in mm finishing mill unit and occur serious steel scrap accident, steel scrap occurs not only to affect production capacity and causes waste product, more seriously can cause the generation of security incident in device damage and steel scrap disposal.
Refer to Fig. 1, prior art press down system is mainly comprised of following part: working roll 11 tops are provided with backing roll 12, and the roll gap between working roll is for controlling the section configuration with 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 large stroke regulates at a slow speed.By work loop 18, No. 17,2,16, No. 1 work loops of backpressure circuit, connected.
Hot-rolling mill is because design is not enough and deteriorated all the year round, there is larger hidden danger in the stability that makes unit in production thin plate specification be, add and 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 rolling, but nominal pressure and time are all limited, F1～3 nominal pressure is maximum 1500 tons at present, maximum 1000 tons of F4～7 nominal pressure, acyclic homologically trioial process is only less than 1 minutes, so, although demarcate and think all normal before open rolling, but during actual rolling, often occur that roll gap sideslip causes strip running deviation and gives up between frame.Reason is that band steel of Dynamic Rolling Process was generally wanted about 2.5 minutes, roll-force is rolled down to 3500 tons from 1000 tons always, even higher, so static demarcation zeroing, can not illustrate dynamic rolling state, for this reason, must find a kind of can approach Dynamic Rolling Process time as far as possible the data of rolling state very important, and from equipment existence conditions, find a kind of static zeroing to confirm the method for hydraulic state, be the key that solves tandem mill rolling steel scrap.
Current way is: in order to ensure milling train before open rolling by existing method means, confirmation milling train can be produced, can only be after installing new working roll, carry out 300 tons of static precompressed, 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, to unload be zero to acyclic homologically trioial pressure, operative employee is according to 300 tons of roll gap both sides deviations and 1500 tons of (comprising 1000 tons of afer bays) roll gap both sides deviations, preset first roll gap of open rolling, first band steel threading actual conditions, adjust again each frame actual deviation.
Prior art adopts acyclic homologically trioial method, under there is not prerequisite that serious Inner lets out problem in hydraulic test, can guarantee rolling stability, but the Inner of hydraulic jack lets out and each hydraulic valve state all can not be found by acyclic homologically trioial process, in original when roll-force constantly increases, let out and hydraulic valve state is all dynamically changing, so state is incomparable when the hydraulic pressure of frame and static acyclic homologically trioial during actual rolled band steel.
Summary of the invention
The present invention is intended to propose a kind of utilization under without 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 in advance the hidden danger that frame hydraulic system exists, pinpoint the problems and a little disposed in time, guaranteed 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 of utilizing static pressurize to test dynamic roll gap hydraulic state is proposed, the method remains on 1500 tons, F4～7 rolling mill hydraulic pressure by F1～3 rolling mill hydraulic pressure and remains on 1000 tons and maintain 5 minutes, and carried out process in 5 minutes: the alternate position spike that detects two oil cylinder pistons in each loop; Detect the internal leakage of oil cylinder; Detect the deflection of the relative cylinder body of piston.
In one embodiment, the alternate position spike that detects 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, cover the alternate position spike that total travel is measured two oil cylinder pistons, are defined as Δ h=h
ds-h
os, h wherein
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 of detection 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 the relative cylinder body of described detection piston comprises: the reading that reads 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 method of dynamic roll gap hydraulic state is tested in the static pressurize of utilization of the present invention can find the hidden danger that frame hydraulic system exists in time, 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 has disclosed the structure chart of press down system in prior art.
Fig. 2 has disclosed No. 1 loop of applying hydraulic press down system of the present invention.
Fig. 3 has disclosed No. 2 loops of applying hydraulic press down system of the present invention.
Fig. 4 has disclosed the static pressurize of utilization of the present invention and has tested the flow chart of the method for dynamic roll gap hydraulic state.
The specific embodiment
For the stability that guarantees finish rolling press down system, to guaranteeing to produce, stablize, avoid occurring that steel scrap etc. is vital, propose the present invention.
Finish rolling hydraulic press down system arranges two-way oil supply system conventionally; be called as respectively loop; the common sparing in two loops is provided with safety unloading valve; when system pressure occurs when abnormal protecting mechanical device not to be damaged; the top of each frame both sides is provided with accumulator; F1～F3 frame shares a system, F4～F7 shares a system, and Accumulator arrangements is set respectively, and the effect of accumulator is to suppress system pressure fluctuation.Roll gap data after large component analysis steel scrap, while finding large regulated quantity, the asynchronous roll gap that causes of two side cylinders is the major reason that causes steel scrap extremely, for this reason, seek to confirm method and the origin cause of formation of two side cylinder synchronisms, the regular confirmation system of 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 residing situation of each rolling mill hydraulic duty.It is as follows that the executive condition of method of dynamic roll gap hydraulic state is tested in the static pressurize of utilization of the present invention:
1) this pressurize test is to remain 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 2000 tons～2800 tons left and right, F4～7 milling train is generally 1000 tons～1700 tons left and right.
2) the static test hydraulic pressure dwell time was set as in 5 minutes, and the release amount of both sides on standard solution pressure pressure basis is controlled 5 minutes both sides release ratios and is no more than 10%, and band steel maximum duration of our Dynamic Rolling Process is 2.5 minutes, so time span is enough.
Fig. 2 has disclosed No. 1 loop of applying hydraulic press down system of the present invention.Fig. 3 has disclosed No. 2 loops of applying hydraulic press down system of the present invention.Applying hydraulic press down system of the present invention is comprised of transmission side valve platform 20, operation side valve platform 30 and pumping plant 40.Transmission side valve platform 20 is comprised of four hydraulic control one-way valves 21, two servo valves 22, hand stop valve 23, unloader 24, No. 2 circuit controls duty valves 25.Operation side valve platform 30 is comprised of four hydraulic control one-way valves 31, two servo valves 32, hand stop valve 33, unloader 34, a No. 1 circuit controls duty valve 35.
Fig. 4 has disclosed the static pressurize of utilization of the present invention and has tested the flow chart of the method for dynamic roll gap hydraulic state.As shown in Figure 4, this utilizes method that static pressurize tests dynamic roll gap hydraulic state that F1～3 rolling mill hydraulic pressure is remained on to 1500 tons, F4～7 rolling mill hydraulic pressure to remain on 1000 tons and maintain 5 minutes, and carried out process in 5 minutes:
401. detect the alternate position spike of two oil cylinder pistons in each loop.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, cover the alternate position spike that total travel is measured two oil cylinder pistons, be defined as Δ h=h
ds-h
os, h wherein
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.
402. detect the internal leakage of oil cylinder.In one embodiment, step 402 comprises following process: turn-off check valve; And the decrease that detects 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.
403. detect the deflection of the relative cylinder body of piston.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 the relative cylinder body of piston comprises: the reading that reads 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 in detail the static pressurize of utilization of the present invention below and test a concrete process of implementing of the method for dynamic roll gap hydraulic state:
Use respectively the combination in No. 1 loop, No. 2 loops, No. 2 loop, No. 1 loop+, No. 1 loop, No. 2 loop+, adopt manual given mode to set the aperture of servo valve, two side cylinders press down simultaneously, when one of them oil cylinder piston is covered total travel, the difference of two cylinder piston positions, 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, considers the virtual condition of each element of system, 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 larger compared with deviation little and another loop, the servo valve existing problems in the loop that deviation is large, can do further to confirm by following second, third point.
The internal leakage test of oil cylinder.Concerning F1～F3, be pressed onto 1500 tons, F4～F7 and be pressed onto 1000 tons, turn-off check valve, keeps 5 minutes, the decrease of roll-force is as the criterion of weighing oil cylinder (comprising check valve) leakage, and the decrease of roll-force of usining is not more than 10% as critical value.In addition, the difference of the decrease of same frame both sides roll-force is no more than 30% of its average.
System leak test.Concerning F1～F3, be pressed onto 1500 tons, F4～F7 and be pressed onto 1000 tons, cutting system fuel feeding, keeps 5 minutes, and the decrease of roll-force is as the criterion of weighing system leak, and the decrease of roll-force of usining is not more than 15% as critical value.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 of each cylinder piston rod (entrance of milling train, outlet side), the wearing and tearing of oil cylinder piston guidance tape and cylinder barrel can cause the relative cylinder body deflection of piston, make the reading of two position sensors occur difference, owing to depressing the restriction of the sideshake (1.5mm) of bearing dowel, this species diversity is limited, and regulation maximum is no more than 4.5mm;
By this static pressurize flow testing, substantially can judge rolling mill hydraulic system in a kind of what kind of state, also can determine hydraulic jack or the fault of system control valve, by after relevant treatment again pressurize test, whether confirmation problem solves, finally realizes the object that Dynamic Rolling Process stability is controlled.
Take be F1, No. 1 loop pressurize test is example:
After pressure to 1500 ton, electric panel room provides signal, by the servo valve in No. 1 loop 22 zero dead stops, the servo valve 32 in No. 2 loops be opened to-100%, No. 1 loop duty valve 25 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 more than having moved, start to record 5 minutes release results.
The analysis of release result:
No. 1 loop release in the same side is fast, and No. 2 loops are normal, is judged as No. 2 loop check valves 31 and closes not dead.
As fast in No. 1 equal release in loop in both sides, and pressure relief value is suitable, is judged as No. 2 return circuit valves 35 abnormal.
Loop, No. 1, the same side and No. 2 equal releases in loop are fast, but pressure relief value difference is large, are judged as No. 1 loop check valve 21 and No. 2 loop check valves 31 and all close not dead.
Loop, No. 1, the same side and No. 2 equal releases in loop are fast, but pressure relief value is suitable, and being judged as 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 method of dynamic roll gap hydraulic state is tested in the static pressurize of utilization of the present invention can find the hidden danger that frame hydraulic system exists in time, 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. a method of utilizing static pressurize to test dynamic roll gap hydraulic state, it is characterized in that, the method remains on 1500 tons, F4～7 rolling mill hydraulic pressure by F1～3 rolling mill hydraulic pressure and remains on 1000 tons and maintain 5 minutes, and carried out 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 the relative cylinder body of piston.
2. the method for dynamic roll gap hydraulic state is tested in the static pressurize of utilization 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:
Set the aperture of servo valve;
Two side cylinders press down simultaneously, when one of them oil cylinder piston, cover the alternate position spike that total travel is measured two oil cylinder pistons, are defined as Δ h=h
ds-h
os, h wherein
dsfor transmission side oil cylinder position, h
osfor active side oil cylinder position.
3. the method for dynamic roll gap hydraulic state is tested in the static pressurize of utilization 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. the method for dynamic roll gap hydraulic state is tested in the static pressurize of utilization as claimed in claim 1, it is characterized in that, the internal leakage that detects oil cylinder comprises:
Turn-off check valve;
Detect the decrease of roll-force.
5. the method for dynamic roll gap hydraulic state is tested in the static pressurize of utilization 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. the method for dynamic roll gap hydraulic state is tested in the static pressurize of utilization 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, and the deflection of the relative cylinder body of described detection piston comprises:
Read the reading of two position sensors;
The difference of comparative reading.
7. the method for dynamic roll gap hydraulic state is tested in the static pressurize of utilization as claimed in claim 6, and the judgment threshold of the difference of described reading is 4.5mm.
8. the method for dynamic roll gap hydraulic state is tested in the static pressurize of utilization 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106286474A (en) * | 2015-06-08 | 2017-01-04 | 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 |
| CN108213090A (en) * | 2017-12-29 | 2018-06-29 | 武汉钢铁有限公司 | A kind of finishing mill acyclic homologically trioial method |
| CN109563786A (en) * | 2016-05-31 | 2019-04-02 | Avl 里斯脱有限公司 | Conventional engine and method and apparatus for being diagnosed and/or being controlled to conventional engine |
| CN111872133A (en) * | 2020-08-03 | 2020-11-03 | 华峰铝业有限公司 | Metal composite material bonding rolling method for improving defects of air bubbles and leather material deviation |
| US11421587B2 (en) | 2016-05-31 | 2022-08-23 | Avl List Gmbh | Method and system for diagnosing and/or controlling a reciprocating engine having a variable compression ratio |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106286474A (en) * | 2015-06-08 | 2017-01-04 | 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 |
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| 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 |
| CN111872133A (en) * | 2020-08-03 | 2020-11-03 | 华峰铝业有限公司 | Metal composite material bonding rolling method for improving defects of air bubbles and leather material deviation |
| 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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