CN102773269A - Plate rolling transporter and control method thereof - Google Patents
Plate rolling transporter and control method thereof Download PDFInfo
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- CN102773269A CN102773269A CN2012102906562A CN201210290656A CN102773269A CN 102773269 A CN102773269 A CN 102773269A CN 2012102906562 A CN2012102906562 A CN 2012102906562A CN 201210290656 A CN201210290656 A CN 201210290656A CN 102773269 A CN102773269 A CN 102773269A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000001174 ascending effect Effects 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention discloses a plate rolling transporter and a control method thereof. The device comprises a plurality of bi-conical rollers and at least one supporting roller, wherein the bi-conical rollers are orderly arranged on a transferring channel; and the supporting roller is arranged on the transferring channel and at the middle part between the two bi-conical rollers; and the mounting rack of the supporting roller is connected with a driving cylinder for driving the mounting rack to ascend and descend; according to the temperature, width and thickness of a plate material detected by a sensor and the material of a rolled plate, the judgment of whether the middle part of the plate material used for the next process is arched is performed; and if so, the arching quantity is calculated, and the height position of the supporting roller is adjusted by the driving cylinder according to the arching quantity of the middle part, so that the middle part of the plate material is supported. According to the plate rolling transporter and the control method thereof, the arching quantity of the middle part during the process of rolling the plate material is compensated by the supporting device, the ascending quantity and descending quantity of the supporting roller can be adjusted along with the changes of the width and thickness of the plate material, so that the dynamic compensation on the arching quantity of the middle part is achieved.
Description
Technical Field
The ingot with the diameter of 2350 mm and the diameter of 4050 mm is rolled into an aluminum medium plate with the diameter of 6 mm and the diameter of 2360 mm. When proceeding to the first
During the pass, the width of the plate in the current pass can be obtained by calculating the width
=2358.98 mm, roll gap
The invention is = 17.32 mm, and relates to the technical field of metal pressure processing, in particular to a plate conveying device of a rolling production line and a conveying control method thereof.
Background
In order to obtain better surface quality of the aluminum alloy medium plate, a production line usually adopts a biconical roller way, so that the two side edges of the plate strip are in contact with the roller way during transportation and rolling, and the surface of the plate is not in contact with the roller way and a grid between the roller ways. However, in the rolling process, along with the increase of the pass deformation, the width of the aluminum plate is gradually increased, and the thickness of the aluminum plate is gradually reduced, so that the plate strip is easy to have concave deflection, namely the phenomenon of waist collapse. This results in an increased contact area between the strip and the roller table and the grid between the roller tables and surface scratches. The waist collapse phenomenon in the rolling process becomes a first difficult problem restricting the production of ultra-wide and thin aluminum plates. Based on the above problems, the ultra-wide and thin aluminum plate has a state of short supply and demand in the market, and the price is continuously increased. At present, no special technology is provided for the problem, so that a proper supporting device and a corresponding control technology need to be designed for solving the problem.
Disclosure of Invention
The invention aims to provide a plate rolling and conveying device which can solve the problem that a rolled ultra-wide thin plate collapses.
In order to solve the problems, the invention adopts the technical scheme that: the plate rolling and conveying device comprises a plurality of double-cone rollers which are sequentially arranged on a conveying channel, at least one supporting roller which is arranged on the conveying channel and in the middle between the two double-cone rollers, and a mounting frame of the supporting roller is connected with a driving cylinder which drives the mounting frame to lift.
In the technical scheme of the plate rolling and conveying device, a more specific technical scheme may be that: at least one position sensor for detecting the height of the support roller is connected to the input of a control unit for controlling the drive cylinder. The wheel surface of the supporting roller is made of light high-temperature-resistant materials. A plurality of support rollers are mounted on the mounting bracket.
Another object of the present invention is to provide a method for controlling rolling and conveying of sheet material, which can compensate for the amount of waist collapse during rolling of ultra-wide thin sheet material.
In order to achieve the purpose, the invention adopts the technical scheme that: the plate rolling and conveying control method adopts a plate rolling and conveying device which comprises a plurality of double-cone rollers sequentially arranged on a conveying channel, at least one supporting roller arranged on the conveying channel in the middle between the two double-cone rollers, and a driving cylinder for driving the mounting frame to lift; at least one position sensor for detecting the height of the support roller, said position sensor being connected to the input of a controller for controlling the drive cylinder;
the plate rolling and conveying control is carried out according to the following steps:
A. the controller judges whether the waist collapse occurs to the next plate according to the material, the temperature and the width-thickness ratio of the rolled plate;
B. and if the waist collapse occurs, calculating the waist collapse amount of the support roller, and adjusting the height position of the support roller through the controller and the driving cylinder according to the waist collapse amount.
In the above plate rolling conveying control method, a more specific technical solution may be:
after the waist collapse of the next-time plate is judged, the compensation quantity of the waist collapse of the next-time plate is calculated by adopting the following formula:
Lifting the supporting rollers on the conveying channel in a segmented mode, and calculating the lifting time point of a piston rod of a driving cylinder for controlling the supporting rollers according to the following formula:
the relationship between the length of the plate outlet and the length of the roller surface rotated by the roller is as follows:
wherein the forward slip valueThe calculation formula of (A) is as follows:
the calculation formula of the length of the roller surface of the roller is as follows:
calculating the length of the plate outlet in real time according to the length of the roller surface rotated by the roller
When the length of the sheet material covers all the support rollers controlled by the first actuating cylinder on the roll outlet side:
when in use
While covering the second cylinder-controlled support roller:
when in use
When covering the first
When driving the cylinder-controlled support rollers:
the point in time at which the drive cylinder starts to rise
Comprises the following steps:
wherein,
the rolling speed curve is preset;is the real-time sheet outlet length in millimeters;
the length of the roll surface which is rotated by the roll in real time is in millimeter; 
Is the working roll radius in millimeters;
the rolling reduction is expressed in millimeters;
is the distance between the supporting rollers, in millimeters;
the distance from one support roller closest to the rolling mill to the roller axis of the rolling mill is measured in millimeters; the number of the supporting rollers controlled by each driving cylinder is as follows
；
For the origin of the biting time of the sheet material, it is preferable
=0 in seconds;
covering a certain supporting device for the length of the plate outlet, wherein the unit is second;
the time required to drive the cylinder up is in seconds.
Accurately positioning the height of the supporting roller by using the real-time feedback value of the position sensor if the deviation is satisfied
When the hydraulic cylinder is in place, wherein,
is the measured height value of the supporting roller measured by the position sensor,
the allowable error set for the system.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects: the lifting supporting rollers which are arranged on the conveying channel, namely the biconical roller way, play a role in supporting the middle of the plate belt, and the lifting amount of the supporting rollers can be adjusted along with the change of the width and the thickness of the plate, so that the waist collapse amount is compensated in real time; when the head and the tail of the plate are buckled or in other irregular shapes, the segmented lifting function can be started, so that the possibility of collision between the head and the tail of the plate and the supporting device is reduced; the device and the application of the control technology thereof can effectively solve the problem of surface quality deterioration caused by the waist collapse of the plate, and can produce the ultra-wide thin plate with high quality and high efficiency.
Drawings
Fig. 1 is a top view of the structure of the biconical roller table and the support device according to the present invention.
Fig. 2 is a front view of the biconical roller table and the support device of the present invention.
Figure 3 is a schematic view of the support device of the present invention in a non-operative position.
Fig. 4 is a schematic view of the support device of the present invention in an operative position.
Fig. 5 is a schematic view of controlling the elevation of the first set of support means in accordance with the sheet exit length elevation.
Fig. 6 is a schematic view of controlling the elevation of the second set of support means in accordance with the elevation of the sheet exit length.
Detailed Description
The invention will be further described in detail with reference to the following examples:
the supporting device in the plate rolling and conveying device shown in fig. 1 is arranged between a front double-cone roller way and a rear double-cone roller way of a rolling mill and between other double-cone roller ways related to finished product transportation, and comprises a supporting roller 2, a mounting frame 5 and a driving cylinder, wherein the supporting roller 2 is positioned on the mounting frame 5 through a roller neck 4 and a bearing seat 3, and the driving cylinder is driven by a controller. A supporting roller 2 is arranged in the middle between two double-cone rollers 1, the double-cone rollers 1 are rollers with large ends and small middle, the two ends are cones, and the middle is a cylinder. The supporting roller 2 is a passive hollow rotary roller, and in order to avoid scratching the surface of the plate when in contact with the supporting roller, the supporting roller is made of rubber or other light high-temperature-resistant materials, such as chrome plating on the surface of the roller. On the premise of ensuring the strength of the supporting roller 2, the mass and radius of the supporting roller 2 should be reduced as much as possible to achieve the purpose of reducing the moment of inertia of the supporting roller 2. The driving cylinder in the embodiment adopts a hydraulic cylinder, the mounting frame 5 is connected and fixed on a piston rod of the hydraulic cylinder, and the mounting frame 5 is used for driving the plurality of supporting rollers 2 to move up and down to adjust the height position of the middle part of the supporting plate by only one hydraulic cylinder so as to save the manufacturing cost. The present invention has a high requirement on the levelness of the mounting frame 5 to ensure that the supporting rollers 2 mounted thereon are all in the same horizontal line, so as to reduce the error in the lifting height of the supporting rollers 2. Each mounting frame 5 on the conveying channel of the plate rolling and conveying device shown in fig. 2 is provided with 3 supporting rollers 2, the double-cone roller 1 is mounted on a rack through a bearing seat 9, a position sensor 5 for detecting the position height of the supporting roller 2 is mounted on the hydraulic cylinder 4, the position sensor 5 can be an external sensor, in other embodiments, a built-in sensor can also be used, and the position sensor 5 is electrically connected with the input end of a controller.
The useful parameters shown in fig. 3 and 4 include:
when the double-cone roller is in a non-working state, the distance from the top of the rotary supporting roller 2 to the upper edge of the middle part of the double-cone roller 1 is in millimeter;the distance from the upper edge of the middle part of the biconical roller 1 to the lower edge of the plate 8 in the width direction is absolutely straight, and the unit is millimeter;
the waist collapse compensation quantity of the plate 8 is in millimeters; the overall length of the biconical roller 1 is F, and the unit is millimeter; the length of the middle cylindrical part of the roller is E, and the unit is millimeter; the maximum stroke of the hydraulic cylinder 7 isIn millimeters; most preferablyA small stroke of
In millimeters; the bevel angle of the cone of the biconical roller 1 is
In degrees. The current rolling pass number is set as
。
When the plate 8 is rolled to a certain pass, the computer judges whether the waist collapse phenomenon occurs in the next pass, and the actual temperature of a certain aluminum alloy plate is set as
A hardness coefficient determined by the alloy material of
The width of the rolled plate in the next pass is measured by a side guide ruler as
If the plate is too thin, the plate cannot be clamped and measured by the side guide ruler, and the measurement can be obtained through the calculation of the width of the rolling process. The thickness is calculated asThe calculation formula is as follows:
whereinIs as follows
In each passThe gap between the rolls is set up,the rolling force is set by a rolling table. 
The roll gap is adjusted to zero to set the rolling force.
The rigidity of the rolling mill can be obtained by a rigidity test.
Judging whether the waist collapse occurs after the next rolling of the plate is finished according to the following formula:
wherein,
the empirical coefficients are determined for waist collapse from production practices.
Is a function taking the alloy temperature, the material hardness coefficient and the width-thickness ratio of the plate as independent variables. The temperature of the plate is measured by thermometers arranged in front of and behind the rolling mill, and the width of the plate is measured by a side guide ruler arranged in front of and behind the rolling mill. When the above formula is satisfied, it indicates that the waist collapse phenomenon will occur in the next pass of the plate material. When the sheet 8 is not biting into the mill, all the supports on the other side of the mill will be raised in advance into position.
As can be seen from fig. 3, the waist collapse compensation amount should be composed of two parts, namely:
The amount of waist-collapse compensation is the extension stroke of the hydraulic cylinder 7, which determines the maximum stroke of the hydraulic cylinder 7Comprises the following steps:
wherein
The maximum width of the sheet determined for the process. Therefore, the range of the waist collapse compensation amount should be:
when the compensation amount calculated in real time is not within the range, the hydraulic cylinder does not act.
In order to enable accurate positioning of the support roller 2, the feedback from the position sensor 5 is used for closed-loop control positioning. The actual height value of the supporting roller 2 measured by the position sensor 5 is set as
If the deviation is satisfiedWhen the hydraulic cylinder is in place, the hydraulic cylinder is determined,the allowable error set for the system.
As shown in fig. 5 and 6, when the head and tail of the plate 8 are irregular or have poor shape, if the support device on the outlet side of the rolling mill is lifted up in advance, the head and tail of the plate may collide with the support device, which may affect the quality of the plate and damage the support device. Since the support roller 2 is a hollow roller, the strength thereof is affected, and the roller cannot withstand collision and scraping caused by long-term operation. Assuming that the distance between the supporting rollers 2 isIn millimeters; one support roll 2 closest to the rolling mill is at a distance from the axis of the working roll 9 of the rolling millIn millimeters; the controllable number of the supporting rollers of each hydraulic cylinder is
. The principle of the segmented start and stop is that a set of support rollers should be jacked into place while the length of the sheet outlet is fully covered by the set of rollers. Therefore, a mathematical model should be established to calculate the exit length of the sheet material in real time.
1) Firstly, calculating the real-time outlet length of the rolled piece according to the relation between the real-time rotating length of the roller and the real-time outlet length of the rolled piece
The length of the roll surface turned during rolling is slightly less than the exit length of the product due to the presence of the forward slip, and the relationship between these two lengths is briefly deduced as follows:
the forward slip formula shows that:
after transformation, the following results are obtained:
(5)
multiplying both sides by time
：
Because the roll will be after the deformation zone length of turning first, the panel just can come out from the opposite side, therefore the export length of panel is:
whereinThe rolling speed of the rolled piece is in millimeter/second;
is the roller speed, with unit of mm/s;
is the rolling time in seconds;
the real-time outlet length of the rolled piece is in millimeters; .
The real-time rotating length of the roller is in millimeter;
roll radius in millimeters;the rolling reduction is expressed in millimeters;
is a forward slip value, the algorithm is as follows:
2) the roll rotating length is calculated according to the time and the roll rotating speed as follows:
wherein,is a rolling speed curve function of a rolled piece and is a preset value;to get upThe starting point in time, i.e. the bite point in time, is preferably
=0。
The time the roll has bitten.
Substituting formula (9) for formula (7) yields a sheet having an exit length of:
assuming a hydraulic cylinder is raised at a rate of
In mm/s, the time required is about
In seconds. Thus when
The length of the sheet 8 covers all the support rollers controlled by the first hydraulic cylinder on the outlet side, as can be obtained from equation (10):
when covering the second hydraulic cylinder controlled support roller:
when covering the firstHydraulic cylinder controlled support roller:
(13)
can be calculated reversely according to the above formula
The numerical value of (c). Taking into account the time required for the cylinder to rise
. The point in time at which the hydraulic cylinder starts to rise
Comprises the following steps:
starting to time by using the plate biting time point as the time origin, and passing
After a second the cylinder starts to rise. When the plate gradually leaves each group of supporting devices, the hydraulic cylinders thereof fall back in sequence.
Will roll at 499 milli-lenses
Thousand newtons, the width of the next board
=2359.34 mm, roll gap
=13.85 mm, rolling force
Kilonewtons, mill stiffnessRolling force of 8000 kilo-newtons/mm
=10000 kn, working roll radius
，The bevel angle of the cone of the biconical roller is 1.64 degrees, and the length of the cylindrical part in the middle of the roller
=500 mm, widest product specification=3100 mm, controllable number of support rollers per cylinder The distance between the supporting rollers is
800 mm; distance from one support roller nearest to rolling mill to working roller axis of rolling mill
3765.5 mm, speed of the support device hydraulic cylinder
=30 mm/sec. Taking the biting time point as the time origin,then
And = 0. For convenience, assume that the roll speed is constantMm/sec. The computer judges that the plate in the next pass has obvious waist collapse phenomenon,
the amount of compensation for the waist collapse of the plate
Comprises the following steps:
the limit compensation amount of the supporting device is as follows:
thickness of this passAnd next thickness
Respectively as follows:
，
the calculated forward slip value is:
when the exit length of the sheet covers all the support rollers controlled by the first hydraulic cylinder on the exit side, the time required
Comprises the following steps:
when covering the second hydraulically controlled supporting roller, the time required
Comprises the following steps:
when covering the first
Hydraulic cylinder controlled support roller:
time required for hydraulic cylinder to rise to position
Comprises the following steps:
the cylinder should therefore cover the support means 1.152 seconds earlier than the sheet exit length, and therefore the first cylinder should be raised at the following time:
the time point when the second hydraulic cylinder is lifted is:
first, the
The time points of lifting of each hydraulic cylinder should be:
Claims (8)
1. The utility model provides a panel rolling conveyor, includes a plurality of biconical rollers of arranging in proper order on transfer passage which characterized in that: at least one supporting roller is arranged on the conveying channel in the middle between the two double-cone-shaped rollers, and a mounting frame of the supporting roller is connected with a driving cylinder for driving the mounting frame to ascend and descend.
2. The slab rolling delivery apparatus as set forth in claim 1, wherein: at least one position sensor for detecting the height of the support roller is connected to the input of a control unit for controlling the drive cylinder.
3. The plate rolling conveying apparatus according to claim 1 or 2, characterized in that: the wheel surface of the supporting roller is made of light high-temperature-resistant materials.
4. The slab rolling delivery apparatus of claim 3, wherein: a plurality of support rollers are mounted on the mounting bracket.
5. A plate rolling and conveying control method is characterized by comprising the following steps: the plate rolling and conveying device comprises a plurality of double-cone rollers sequentially arranged on a conveying channel, at least one supporting roller arranged in the middle of the conveying channel between the two double-cone rollers, and a driving cylinder for driving the mounting rack to lift; at least one position sensor for detecting the height of the support roller, said position sensor being connected to the input of a controller for controlling the drive cylinder;
The plate rolling and conveying control is carried out according to the following steps:
A. the controller judges whether the waist collapse occurs to the next plate according to the material, the temperature and the width-thickness ratio of the rolled plate;
B. and if the waist collapse occurs, calculating the waist collapse amount of the support roller, and adjusting the height position of the support roller through the controller and the driving cylinder according to the waist collapse amount.
6. The plate rolling conveying control method as claimed in claim 5, wherein: after the waist collapse of the next-time plate is judged, the compensation quantity of the waist collapse of the next-time plate is calculated by adopting the following formula:
is a preset value;
the bevel angle of the cone of the biconical roller is the unit of degree; e is the length of the middle cylindrical part of the biconical roller and is in millimeters;
the distance from the upper edge of the middle part of the biconical roller to the lower edge of the plate when the upper edge is absolutely straight in the width direction is expressed in millimeters,the width of the outlet of the next pass of the plate is shown.
7. The plate rolling conveying control method according to claim 5 or 6, characterized in that: the lifting time point of a piston rod of a driving cylinder for controlling the supporting rollers is calculated according to the following formula:
the relationship between the length of the plate outlet and the length of the roller surface rotated by the roller is as follows:
Wherein the forward slip valueThe calculation formula of (A) is as follows:
the calculation formula of the length of the roller surface of the roller is as follows:
calculating the length of the plate outlet in real time according to the length of the roller surface rotated by the rollerWhen the length of the sheet material covers all the support rollers controlled by the first actuating cylinder on the roll outlet side:
when in use
While covering the second cylinder-controlled support roller:
when in useWhen covering the first
When driving the cylinder-controlled support rollers:
the point in time at which the drive cylinder starts to riseComprises the following steps:
wherein,
the rolling speed curve is preset;is the real-time sheet outlet length in millimeters;
the length of the roll surface which is rotated by the roll in real time is in millimeter;is the working roll radius in millimeters;
the rolling reduction is expressed in millimeters;
is the distance between the supporting rollers, in millimeters;
the distance from one support roller closest to the rolling mill to the roller axis of the rolling mill is measured in millimeters; the number of the supporting rollers controlled by each driving cylinder is as follows
；
For the origin of the biting time of the sheet material, it is preferable
=0 in seconds;covering a certain supporting device for the length of the plate outlet, wherein the unit is second;
the time required to drive the cylinder up is in seconds.
8. The plate rolling conveying control method as claimed in claim 7, wherein: accurately positioning the height of the supporting roller by using the real-time feedback value of the position sensor if the deviation is satisfied
When the hydraulic cylinder is in place, wherein,
is the measured height value of the supporting roller measured by the position sensor,
the allowable error set for the system.
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|---|---|---|---|
| CN201210290656.2A CN102773269B (en) | 2012-08-16 | 2012-08-16 | Plate rolling transporter and control method thereof |
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| WO2013071867A1 (en) * | 2011-11-19 | 2013-05-23 | 吉林大学 | Rolling device and the method thereof |
| CN104492824A (en) * | 2014-11-26 | 2015-04-08 | 河南万达铝业有限公司 | 2400-hot-continuous-rolling-mill inner roller bed and method for removing marks of hot-continuous-rolling-mill aluminum plate |
| CN105363795A (en) * | 2015-11-17 | 2016-03-02 | 北京科技大学 | Dynamic cooperative control system and method for speeds of tapered roll gangs of rolling production line |
| CN108655177A (en) * | 2017-03-31 | 2018-10-16 | 宝山钢铁股份有限公司 | The intelligent anticollision control method of roller bed frame |
| US10421107B2 (en) | 2015-12-21 | 2019-09-24 | Primetals Technologies, Limited | Roller table apparatus and method of using roller table apparatus |
| CN110497010A (en) * | 2019-08-08 | 2019-11-26 | 北京科技大学设计研究院有限公司 | A kind of Aluminum Alloy Plate sheared length sizing apparatus and control method |
| CN112046997A (en) * | 2020-08-19 | 2020-12-08 | 宝钢特钢韶关有限公司 | Main conveying roller anti-collision device and using method thereof |
| CN112808779A (en) * | 2020-12-30 | 2021-05-18 | 东北轻合金有限责任公司 | Device and method for preventing lower surface of aluminum plate of hot roughing mill from being scratched |
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| US10421107B2 (en) | 2015-12-21 | 2019-09-24 | Primetals Technologies, Limited | Roller table apparatus and method of using roller table apparatus |
| CN108655177A (en) * | 2017-03-31 | 2018-10-16 | 宝山钢铁股份有限公司 | The intelligent anticollision control method of roller bed frame |
| CN108655177B (en) * | 2017-03-31 | 2019-12-27 | 宝山钢铁股份有限公司 | Intelligent anti-collision control method for roller bed frame |
| CN110497010A (en) * | 2019-08-08 | 2019-11-26 | 北京科技大学设计研究院有限公司 | A kind of Aluminum Alloy Plate sheared length sizing apparatus and control method |
| CN112046997A (en) * | 2020-08-19 | 2020-12-08 | 宝钢特钢韶关有限公司 | Main conveying roller anti-collision device and using method thereof |
| CN112808779A (en) * | 2020-12-30 | 2021-05-18 | 东北轻合金有限责任公司 | Device and method for preventing lower surface of aluminum plate of hot roughing mill from being scratched |
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