CN114963019A - Automatic valve fault detection method for laminar cooling device - Google Patents
Automatic valve fault detection method for laminar cooling device Download PDFInfo
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- CN114963019A CN114963019A CN202110197985.1A CN202110197985A CN114963019A CN 114963019 A CN114963019 A CN 114963019A CN 202110197985 A CN202110197985 A CN 202110197985A CN 114963019 A CN114963019 A CN 114963019A
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- 238000001816 cooling Methods 0.000 title claims abstract description 42
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000002159 abnormal effect Effects 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000005507 spraying Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011418 maintenance treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
- F16L41/03—Branch units, e.g. made in one piece, welded, riveted comprising junction pieces for four or more pipe members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
- F16L41/16—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe the branch pipe comprising fluid cut-off means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
The invention discloses a method for automatically detecting the valve fault of a laminar flow cooling device, wherein a flowmeter is arranged on each branch pipe of a main water supply pipe; the automatic detection method for the valve fault comprises the steps of detecting a normally open valve and a normally closed valve, and comprises the following steps: setting to close or open valves on all the branch pipes through a master control system, monitoring whether readings of all the flowmeters are abnormal, firstly judging the branch pipe corresponding to the flowmeter with abnormal change, and then sequentially opening or closing the valves on the branch pipe; when the flow meter is not changed when one valve on the branch pipe is opened or closed, the valve is judged to be a normally open valve or a normally closed valve. According to the invention, the flow meter is arranged on the branch pipe of each layer cold tipping bracket, and the state of each valve is calculated from the change of the flow, so that the manual workload is reduced, the detection efficiency is improved, and the downtime is reduced.
Description
Technical Field
The invention relates to a laminar cooling technology of a hot rolling process, in particular to a valve fault automatic detection method of a laminar cooling device.
Background
The laminar cooling equipment is positioned between the finish rolling and the coiling and mainly has the task of controlling a laminar cooling water spraying valve to cool the strip steel from a certain finish rolling temperature to a required coiling temperature. Since the coiling temperature has a great influence on the properties of the strip, it must be controlled within a certain target coiling temperature tolerance. Referring to fig. 1, the laminar cooling equipment includes 20 cold layer tilting supports 1(BANK) disposed between a finishing mill stand 2 and a coiler measuring device 3, three underground coilers C1, C2, C3 behind the coiler measuring device 3, wherein the 20 cold layer tilting supports 1 are divided into 2 rows corresponding to the upper and lower surfaces of a strip steel 4, the cold layer tilting supports 1 of each row are sequentially arranged at an interval of 2.52m, each cold layer tilting support 1 has 4 headers, the headers corresponding to the upper and lower surfaces of the strip steel 4 are symmetrically arranged, and valves are disposed on the headers. In the water supply mode, 1 main water supply pipe is arranged beside the laminar cooling equipment, 40 branch pipes are arranged on the main water supply pipe and respectively supply water to 20 laminar cooling tipping brackets 1, and each branch pipe is divided into 4 branch pipes to supply water to corresponding collecting pipes. In the arrangement mode of the laminar cooling area, the 1 st to 18 th cold tipping supports 1 are a main cold feed-forward area 5, the 19 th and 20 th cold tipping supports 1 are fine cooling feedback areas 6, a certain number of valves are opened in the main cold feed-forward area 5 according to the presetting of a model, the function is to cool the strip steel 4 to the target temperature, the control of the fine cooling feedback areas 6 is to compare the actual coiling temperature measured by a coiler measuring device 3 with the target coiling temperature to adjust the opening or closing of the headers on the 19 th and 20 th cold tipping supports 1, so as to ensure that the measured coiling temperature oscillates and approaches near the target coiling temperature and ensure that the temperature difference between the same plates is in the target range, and thus the performance of the strip steel 4 is stably controlled. The existing floor cooling tipping bracket 1 is not provided with a flow detection device, so that the condition of the header on each floor cooling tipping bracket 1 can be checked only by manually arriving at the site and informing a console to be fully opened or fully closed by an interphone.
As described above, there are 160 headers in total on the 20 floor-cooling rollover stands 1, and there are 160 valves to control the opening and closing of the cooling water sprayed from the headers. Because the laminar cooling area has the characteristics of high temperature and high humidity, the environment is severe, the valve is very easy to break down under the environment, the cooling water of the corresponding collecting pipe cannot be opened or normally opened, the model cannot identify the faults, and the model is set in a normal state during production, so that the temperature control of the strip steel 4 is seriously influenced. In order to ensure the stable state of the laminar flow cooling equipment, currently, when the laminar flow cooling equipment is required to be shut down and fixed for repair each time, an operator is matched with personnel of a control console, whether a normally open valve exists or not is confirmed on site under the condition that the valve is fully closed, or whether a normally closed valve exists or not is confirmed on site under the condition that the valve is fully opened, and then the maintenance treatment is carried out after the abnormal valve is recorded.
The existing inspection method of laminar cooling equipment needs the following three steps:
1) detecting whether a normally-opened valve exists or not in a set closed state;
2) opening all the valves in the upper row, and confirming whether the valves in the upper row exist or not one by one without spraying water;
3) and closing all the valves in the upper row, opening all the valves in the lower row, and confirming whether the valves in the lower row exist or not one by one without spraying water.
The process needs about 30 minutes after being executed, and no other maintenance operation is needed on a layer cooling roller way, so that the daily shutdown cannot be normally executed, the regular maintenance is generally needed for inspection, the process can be executed only once in the shortest week, and the actual requirements on the site are difficult to meet.
Requires field confirmation by personnel: at present, the production line improves the force pushing automation and the labor efficiency, the number of personnel is greatly compressed, and the operation burden is increased by taking out a worker to specially execute the operation, and other necessary operations are influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the automatic detection method for the valve faults of the laminar cooling device.
In order to achieve the purpose, the invention adopts the following technical scheme:
a valve fault automatic detection method of a laminar flow cooling device comprises the following steps:
each branch pipe of the main water supply pipe is provided with a flowmeter;
the automatic detection method for the valve fault comprises the steps of detecting a normally open valve and detecting a normally closed valve, and comprises the following steps:
setting to close or open valves on all the branch pipes through a master control system, monitoring whether readings of all the flowmeters are abnormal, firstly judging the branch pipe corresponding to the flowmeter with abnormal change, and then sequentially opening or closing the valves on the branch pipe;
when the flow meter is not changed when one valve on the branch pipe is opened or closed, the valve is judged to be a normally open valve or a normally closed valve.
Preferably, the normally open valve is detected as follows:
the master control system sets all the valves to be closed, monitors the readings of all the flow meters, judges that the valves on the branch pipes where the flow meters are located are normally open if the flow is not zero, then sets the valves on the branch pipes to be opened in sequence, judges that the valves are in a normally open state if the flow meters on the branch pipes are not changed when a certain valve is opened, and records the positions of the valves.
Preferably, the detection normally-closed valve is as follows:
the master control system sets to open all the valves and monitors the readings of all the flow meters, if the flow is less than normal, the branch pipe where the flow meters are located is judged to have the normally closed valves, then the valves on the branch pipe are set to be closed in sequence, if the flow meters on the branch pipe are not changed when a certain valve is closed, the valves are judged to be in the normally closed state, and the master control system records the positions of the valves.
Preferably, the staff maintains the valve on site according to the position recorded by the master control system.
Preferably, the branch pipes comprise 4 manifolds, and each manifold is provided with the valve.
Preferably, the laminar cooling device is provided with an upper row and a lower row of the branch pipes, and each row of the branch pipes is provided with 20 branch pipes.
According to the automatic detection method for the valve fault of the laminar cooling device, the flow meter is arranged on the upper branch pipe and the lower branch pipe of each laminar cooling tipping bracket, all the valves are opened/closed by adopting a certain method, and the state of each valve is calculated from the change of the flow, so that the manual workload is reduced, the detection efficiency is improved, and the downtime is reduced. Confirming the position of the normally open valve by a certain method with the aid of the metering value of the flow meter when the valve is closed; when the valve is opened, the position of the non-spraying valve is confirmed by a certain method with the aid of the metering value of the flow meter, and meanwhile, a fault valve list is output and is processed by equipment personnel. The whole detection process is automatically finished by the system, so that the artificial load is effectively reduced, and the detection time is shortened.
Drawings
FIG. 1 is a schematic structural view of a conventional laminar flow cooling apparatus;
FIG. 2 is a schematic diagram of a single branch pipe-mounted flow meter in the method for automatically detecting the failure of a valve of a laminar flow cooling apparatus according to the present invention;
FIG. 3 is a schematic view of the arrangement of branch pipes on the laminar flow cooling apparatus in the method for automatically detecting the valve failure of the laminar flow cooling apparatus according to the present invention;
fig. 4 is a schematic flow chart of the method for automatically detecting the valve failure in the laminar flow cooling apparatus according to the present invention.
Detailed Description
In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.
Referring to fig. 2 and fig. 3, the present invention provides a method for automatically detecting a valve failure of a laminar flow cooling apparatus:
a flowmeter 12 is installed on each branch pipe 11 of the total water supply pipe 10, each branch pipe 11 is provided with 4 headers 13, and each header 13 is provided with a valve 14.
The laminar cooling device is provided with an upper row of branch pipes 11 and a lower row of branch pipes 11, and each row of branch pipes 11 is provided with 20 valves 14 in total.
The automatic detection method for the valve fault comprises the steps of detecting a normally open valve and a normally closed valve, and comprises the following steps:
the valves 14 on all the branch pipes 11 are set to be closed or opened through a master control system, whether the readings of all the flow meters 12 are abnormal or not is monitored, the branch pipe 11 corresponding to the flow meter 12 with abnormal change is judged first, and then the valves 14 on the branch pipe 11 are sequentially opened or closed.
When the flow meter 12 is unchanged when one valve 14 on the branch pipe 11 is opened or closed, the valve 14 is determined to be a normally open valve or a normally closed valve.
The detection of the normally open valve is as follows:
the master control system sets all the valves 14 to be closed, monitors readings of all the flow meters 12, if the flow readings of the flow meters 12 are not zero, determines that the valves 14 are normally open on the branch pipe 11 where the flow meters 12 are located, and then sets 4 valves 14 on the branch pipe 11 to be sequentially opened, and if the flow readings of the flow meters 12 on the branch pipe 11 do not change when a certain valve 14 is opened, determines that the valve 14 is normally open, and the master control system records the position of the valve 14.
The detection of the normally closed valve is as follows:
the master control system sets to open all the valves 14, monitors readings of all the flow meters 12, if the flow readings of the flow meters 12 are less than normal flow readings, determines that the branch pipe 11 where the flow meter 12 is located is normally closed by the valves 14, and then sets 4 valves 14 on the branch pipe 11 to be closed in sequence, if the flow readings of the flow meters 12 on the branch pipe are not changed when a certain valve 14 is closed, determines that the valve 14 is in a normally closed state, and the master control system records the positions of the valves 14.
The master control system collects the recorded fault problems of the valve 14 on a table and displays the fault problems on an operation picture, and a worker can maintain the valve 14 on site according to the position recorded by the master control system.
Referring to fig. 4, a specific control flow of the method for automatically detecting a valve failure of a laminar cooling apparatus according to the present invention is as follows:
1) operating and clicking a function key for valve detection in a man-machine interaction picture of the master control system by utilizing the time gap of roll changing of the finishing mill;
2) closing all the valves 14, detecting the flow readings of the flowmeters 12 corresponding to the 40 branch pipes 11 on site by the master control system, judging that the branch pipes 11 are provided with the normally open valves 14 when the flow readings of the flowmeters 12 are not zero, and recording the group number of the branch pipes 11;
3) opening all the valves 14, detecting the flow readings of the flowmeters 12 corresponding to the 40 branch pipes 11 on the site by the master control system, judging that the normally closed valves 14 are arranged on the branch pipes 11 when the flow readings of the flowmeters 12 are obviously lower than a normal value, and recording the group number of the branch pipes 11;
4) the master control system collects the group numbers of the branch pipes 11 of the normally open/normally closed valves 14, the group numbers of the branch pipes 11 are listed separately, and other branch pipes 11 continue to check the fault valves 14 according to the steps;
5) corresponding to the group number of the branch pipe 11 recorded in the step 3), sequentially opening 4 valves 14 on the branch pipe 11, wherein in a normal condition, when one valve 14 is opened, the flow reading corresponding to the flow meter 12 on the branch pipe 11 changes, and when the flow reading of the flow meter 12 does not change after a certain valve 14 is opened, the valve 14 is judged to be in a normally open state;
6) corresponding to the group number of the branch pipe 11 recorded in the step 4), closing 4 valves 14 on the branch pipe 11 in sequence, under normal conditions, when one valve 14 is closed, the flow reading corresponding to the flow meter 12 on the branch pipe 11 will change, and when the flow reading of the flow meter 12 does not change after a certain valve 14 is closed, judging that the valve 14 is in a normally closed state;
7) the working personnel confirms the conditions of the valves 14 judged in the step 5) and the step 6) on site, the confirmed results are input into a master control system, the master control system uploads the fault valves 14 to a process computer, the process computer considers the normally open and normally closed valves 14 during pre-calculation according to the conditions of the fault valves 14, the number of the valves 14 is correspondingly increased and decreased, and meanwhile, the working personnel maintain or replace the valves according to the number of the fault valves 14.
The automatic valve fault detection method of the laminar flow cooling device can utilize the flow meter to assist a certain algorithm to enable the system to automatically judge the condition of the fault valve, and can be implemented by utilizing the opportunity of daily finish rolling and working roller replacement, thereby not only saving the labor cost, but also reducing the unnecessary downtime, and having better effect after field application.
Examples
The automatic detection method for the valve fault is implemented on a laminar flow cooling device, and specifically comprises the following steps:
1) when a finishing mill of a hot rolling line changes rolls, operating and clicking a function key for valve detection in a man-machine interaction picture of a master control system;
2) all valves 14 on site are closed, the master control system detects the flow of the corresponding flow meters 12 on 40 branch pipes 11 on site, the reading of the flow meters 12 on the 10 th branch pipe 11 on the upper row is found not to be zero, the four valves 14 with the serial number of A, B, C, D on the 10 th branch pipe 11 are sequentially opened, when the valve 14 with the serial number B is opened, the flow of the flow meters 12 is unchanged, and the valve 14 with the serial number B is judged to be in a normally open state;
3) all valves 14 on site are opened, the master control system detects the flow of the corresponding flow meters 12 on 40 branch pipes 11 on site, the reading of the corresponding flow meters 12 on the 8 th branch pipe 11 at the lower row is found to be abnormal, the four valves 14 with the 8 th branch pipe 11 number of A, B, C, D are closed in sequence, when the valve 14 with the number C is closed, the flow of the flow meters 12 is unchanged, and the valve 14 with the number C is judged to be in a normally open state;
4) the master control system uploads a list of fault valves 14 (the valve 14 numbered B on the 10 th branch pipe 11 at the upper row and the valve 14 numbered C on the 8 th branch pipe 11 at the lower row) to the process computer, and the process computer considers the normally open and normally closed valves 14 in the precalculation according to the fault condition and correspondingly increases or decreases the number of the valves 14; while the plant personnel handle the two abnormal valves 14 in time according to the list.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. A valve fault automatic detection method of a laminar flow cooling device is characterized by comprising the following steps:
each branch pipe of the main water supply pipe is provided with a flowmeter;
the automatic detection method for the valve fault comprises the steps of detecting a normally open valve and a normally closed valve, and comprises the following steps:
setting to close or open valves on all the branch pipes through a master control system, monitoring whether readings of all the flowmeters are abnormal, firstly judging the branch pipe corresponding to the flowmeter with abnormal change, and then sequentially opening or closing the valves on the branch pipe;
when the flow meter is not changed when one valve on the branch pipe is opened or closed, the valve is judged to be a normally open valve or a normally closed valve.
2. The method for automatically detecting the valve fault of the laminar flow cooling device according to claim 1, wherein the normally open valve is specifically detected as follows:
the master control system sets all the valves to be closed, monitors the readings of all the flow meters, judges that the valves on the branch pipes where the flow meters are located are normally open if the flow is not zero, then sets the valves on the branch pipes to be opened in sequence, judges that the valves are in a normally open state if the flow meters on the branch pipes are not changed when a certain valve is opened, and records the positions of the valves.
3. The method for automatically detecting the valve failure of the laminar flow cooling device according to claim 1, wherein the normally closed valve is specifically detected as follows:
the master control system sets to open all the valves and monitors the readings of all the flow meters, if the flow is less than normal, the branch pipe where the flow meters are located is judged to have the normally closed valves, then the valves on the branch pipe are set to be closed in sequence, if the flow meters on the branch pipe are not changed when a certain valve is closed, the valves are judged to be in the normally closed state, and the master control system records the positions of the valves.
4. The method for automatically detecting the valve failure of the laminar flow cooling apparatus according to claim 2 or 3, characterized in that: and the staff records the position of the valve according to the master control system and maintains the valve on site.
5. The method for automatically detecting the valve failure of the laminar flow cooling device according to claim 2 or 3, characterized in that: the branch pipes comprise 4 collecting pipes, and the valves are installed on each collecting pipe.
6. The method for automatically detecting the valve failure of the laminar flow cooling device according to claim 5, wherein: the laminar cooling device is provided with an upper row of branch pipes and a lower row of branch pipes, and each row of branch pipes is provided with 20 branch pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110197985.1A CN114963019A (en) | 2021-02-22 | 2021-02-22 | Automatic valve fault detection method for laminar cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110197985.1A CN114963019A (en) | 2021-02-22 | 2021-02-22 | Automatic valve fault detection method for laminar cooling device |
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| Publication Number | Publication Date |
|---|---|
| CN114963019A true CN114963019A (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110197985.1A Pending CN114963019A (en) | 2021-02-22 | 2021-02-22 | Automatic valve fault detection method for laminar cooling device |
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| JP2005249251A (en) * | 2004-03-02 | 2005-09-15 | Noritz Corp | Gas combustion apparatus |
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2021
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| US20130091628A1 (en) * | 2010-06-30 | 2013-04-18 | Woongjin Coway Co., Ltd | Valve control system, bidet using the same, and valve control method |
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| CN204470298U (en) * | 2015-03-20 | 2015-07-15 | 唐山国丰钢铁有限公司 | A kind of mill coil Ultrafast cooling device |
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| Title |
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Application publication date: 20220830 |