CN107470359A - Eighteen-high mill working roll horizontal force supporting mechanism - Google Patents
Eighteen-high mill working roll horizontal force supporting mechanism Download PDFInfo
- Publication number
- CN107470359A CN107470359A CN201710601006.8A CN201710601006A CN107470359A CN 107470359 A CN107470359 A CN 107470359A CN 201710601006 A CN201710601006 A CN 201710601006A CN 107470359 A CN107470359 A CN 107470359A
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- Prior art keywords
- push
- hydraulic cylinder
- horizontal
- working roll
- pull hydraulic
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- 230000007246 mechanism Effects 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 238000003801 milling Methods 0.000 claims abstract description 9
- 239000000725 suspension Substances 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims 2
- 230000008859 change Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000013000 roll bending Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
- B21B2013/028—Sixto, six-high stands
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The present invention relates to a kind of eighteen-high mill working roll horizontal force supporting mechanism, the entrance and exit of each working roll is arranged in pairs in, and crosses steel wire on milling train and is symmetrical arranged;It is characterized in that including vertical push-and-pull hydraulic cylinder, horizontal push-and-pull hydraulic cylinder, two push-and-pull hydraulic cylinders form connecting rod slider structure, the end of connecting rod slider structure sets side support roller box, and side support roller box mainly includes main back lining bearing, secondary back lining bearing, side support roller and roller carriage;Side support roller and working roll contact during work, rolling horizontal force conducts by side support roller to be born by two push-and-pull hydraulic cylinders.So that milling train internal structure layout is more reasonable, roll change is convenient and swift, and manipulation is more flexible.
Description
Technical field
The invention belongs to field of metallurgical equipment, and in particular to a kind of new eighteen-high mill working roll horizontal force support machine
Structure.
Background technology
Eighteen-high mill is a kind of important type for producing cold-strip steel, for the material and ultra-thin strip of the difficult deformation of rolling
There is obvious advantage, but its working roll roll neck is smaller, horizontal rigidity is difficult to ensure that, conventionally by moving horizontally working roll
Set up lateral support structure with working roll both sides, come ensure rolling when working roll horizontal deflection within the scope of permissible value.By
Bigger horizontal force is born in lateral support structure, so its structure is more thick and heavy solid, and will contact with working roll, must
Must the selection roller that can mutually rotate directly support.The existing collateral support of eighteen-high mill mainly has two kinds of forms, wherein one
Kind is to be forwarded to working position by the direct cant side support roller box of hydraulic cylinder, and support works roller, such a scheme is due to design work
Roller moves horizontally relatively difficult, and all horizontal forces are all undertaken by collateral support, and lateral support structure is huge, milling train inner space compared with
It is small, cause to need working roll and intermediate calender rolls removing frame completely when changing collateral support back lining bearing, side support roller could be carried out
The replacing of box, time and effort consuming, have impact on production efficiency;Another is to be supported on by suspending side on middle bearing bracket, by side
The support rotation of support beam push side, and then support of the working roll as horizontal force is compressed, while work is realized by collateral support rotation
As roller move horizontally with roll neck compensation function, but need intermediate calender rolls removing frame when changing collateral support back lining bearing, carry out numerous
Work is dismounted under trivial complicated line, further, since collateral support is hung in middle roll bearing seat, intermediate calender rolls are collateral when needing roller
Support has movement, but now side support beam tightly withstands collateral support on the work rolls, will between side support roller and working roll
Interfere or larger normal pressure under relative slip, have impact on middle roll bending effect, while exacerbate roll surface wearing, subtract
Lack roll campaign, add cost of investment.
The content of the invention
The technical problem to be solved in the present invention is:In order to improve the above-mentioned deficiency of eighteen-high mill in the prior art, this hair
It is bright that a kind of eighteen-high mill working roll horizontal force supporting mechanism is provided so that milling train internal structure is laid out more reasonable, roll change side
Just quick, manipulation is more flexible.
In order to solve the above technical problems, the present invention adopts the following technical scheme that:
A kind of eighteen-high mill working roll horizontal force supporting mechanism, is arranged in pairs in the entrance and exit of each working roll, and on
Milling train is crossed steel wire and is symmetrical arranged;It is characterized in that including vertical push-and-pull hydraulic cylinder, horizontal push-and-pull hydraulic cylinder, two push-and-pull hydraulic cylinders
Connecting rod slider structure is formed, the end of connecting rod slider structure sets side support roller box, and side support roller box mainly includes main backing axle
Hold, secondary back lining bearing, side support roller and roller carriage;Side support roller and working roll contact during work, rolling horizontal force is by collateral
Support roller conduction is born by two push-and-pull hydraulic cylinders.
Further, the lower section of vertical push-and-pull hydraulic cylinder is linearly set vertical sliding with vertical push-and-pull hydraulic cylinder piston rod
Road, vertical push-and-pull hydraulic cylinder piston-rod end are connected with vertical slipper so that vertical slipper can slide up and down along vertical slideway, together
When on vertical slipper be provided with rotation hinge, link lever suspension fork with rotation stud connection and can around rotation hinge freely rotate;Water
The inner side horizontal direction of flat push-and-pull hydraulic cylinder is set linearly sets horizontal slide, horizontal push-and-pull hydraulic cylinder piston rod end with piston rod
End is connected with cross sliding clock, and cross sliding clock can slide back and forth along horizontal slide along steel wire is crossed, and cross sliding clock is provided with hinge slide bar,
Link lever suspension fork can slide in hinge slide bar, while hinge slide bar can be around the hinge rotation on cross sliding clock.
Further, described hinge slide bar is section bulk triangular in shape, and a hinge slide bar wherein summit is hinged on
On cross sliding clock, and slideway is set in the position parallel with the side of the vertex correspondence, the link lever suspension fork passes through the slideway
And it can be slided along the slideway in hinge slide bar.
Further, vertical push-and-pull hydraulic cylinder is arranged on the inside of framework memorial archway, and vertical slideway and horizontal slide are each attached to
On framework memorial archway, horizontal push-and-pull hydraulic cylinder is fixedly mounted on framework memorial archway.
Further, vertical push-and-pull hydraulic cylinder and the equal inbuilt displacement sensor of horizontal push-and-pull hydraulic cylinder.
Further, when lateral support needs support works roller, vertical push-and-pull hydraulic cylinder and horizontal push-and-pull hydraulic cylinder are same
Shi Zuoyong, whole side support roller box move ahead along specific matched curve, during moving ahead with cross steel wire and upper intermediate calender rolls and
Lower intermediate calender rolls keep setting safe not interference distance as boundary.
It is as follows relative to prior art, beneficial effects of the present invention:
The eighteen-high mill of the present invention is a kind of cold-rolling mill of rolling metal strip, in order to reduce working roll horizontal deflection, in work
Make roller both sides and be additionally arranged lateral support, lateral support is a connecting rod slider structure, can be in vertical push-and-pull hydraulic cylinder(Inside dress
There is displacement transducer)With close along fitting routines in the presence of horizontal push-and-pull hydraulic cylinder and final support works roller.18 rollings
The side support roller box of machine working roll horizontal force supporting mechanism front end connection can be individually replaced.Side support roller box mainly includes main backing
Bearing(Stress is big), secondary back lining bearing(Stress is relatively small), side support roller and roller carriage, side support roller and working roll connect during work
Touch and bear horizontal force, final level power is born by vertical slideway and horizontal slide and two hydraulic cylinders by conduction, ensure that and roll
The distribution of horizontal force processed.
This lateral support can also meet working roll horizontal functional, pass through the vertical push-and-pull hydraulic cylinder in both sides and horizontal push-and-pull hydraulic pressure
Cylinder aggregate motion, the support roller roller that pushes the work forward in both sides side is driven to shift to the position for precalculating and setting, in whole moving process
Middle working roll in the state held out against, keeps stably translational all the time.During rolling, although working roll is by the level to entrance side
Power, but in order to prevent the generation of contingency event, and for equipment safety and final product quality consider that both sides hydraulic cylinder is all
Need to lock, cause working roll both sides to be all supported power, avoid unstable when working roll rotates.
This lateral support by its driving element it is safe and reliable link lever suspension fork and side support roller box are moved to intermediate calender rolls
Beyond bearing block range of movement, its motion process and " reversing is put in storage " in we usually life are much like, vertically and horizontally
There are displacement and rotation in direction, can so effectively improve roll change speed, and side support roller box can be also individually replaced, and be avoided
Need the first troublesome operations for intermediate calender rolls first being removed frame.
The vertical push-and-pull hydraulic cylinder of this lateral support and the fitting routines of horizontal push-and-pull hydraulic cylinder motion, are to pass through computer
Programme-control, first by under the good various operating modes of programming(Restrictive condition)Lateral support movement locus, then it is embedded into whole milling train
Control system, finally by executive component execution.The whole motion process of lateral support can all be controlled by computer, position essence
Really, and motion path is optional, avoids interfering with equipment in lateral support motion process, while more most important is to allow ten
The available work roller roll neck scope of mkw mill is wider, has expanded the kind that can roll belt steel product, enhance milling train applicability and
Generality, improve rate of return on investment.
Brief description of the drawings
Fig. 1 is eighteen-high mill lateral support structure schematic diagram of the present invention;
Fig. 2 is the collateral support position view in eighteen-high mill roll change position of the present invention;
In the specific embodiment of the invention and Fig. 1-2, because entrance and exit equipment is symmetrical, therefore phase is used in the following description
Same reference:
The vertical push-and-pull hydraulic cylinder 3- vertical slideways of 1- framework memorial archways 2-
4- rotates hinge 5- link lever suspension fork 6- bending cylinder blocks
Intermediate calender rolls 9- is hinged slide bar on 7-top backing up roll 8-
10-horizontal push-and-pull hydraulic cylinder 11-main back lining bearing
12- sides support roller box 13-secondary back lining bearing
14-side, 15-working roll of support roller
16-lower 17-lower support roll of intermediate calender rolls
18-middle 19-vertical slipper of roll bearing seat
20-cross sliding clock, 21-horizontal slide.
Embodiment
The embodiment of the present invention is further detailed with reference to diagram 1-2:
In the present invention, eighteen-high mill is a kind of cold-rolling mill of rolling metal strip, in order to reduce the horizontal deflection of working roll 15,
The both sides of working roll 15 are additionally arranged lateral support, and lateral support is a connecting rod slider structure, can be in vertical push-and-pull hydraulic cylinder 2
(Inside is equipped with displacement transducer)With close along fitting routines in the presence of horizontal push-and-pull hydraulic cylinder 10 and final support works roller
15.The concrete structure of its lateral support is as described below:Vertical push-and-pull hydraulic cylinder 2 is arranged on the inside of the mill of framework memorial archway 1, its piston rod
It is connected with vertical slipper 19, vertical slipper 19 can slide up and down along the vertical slideway 3 being fixed on framework memorial archway 1, while hang down
Rotation hinge 4 is designed with straight sliding block 19, link lever suspension fork 5 is connected with rotation hinge 4 and can freely rotated around rotation hinge 4.
Horizontal push-and-pull hydraulic cylinder 10(Inside is equipped with displacement transducer)It is fixedly mounted on framework memorial archway 1, its piston rod and cross sliding clock
20 are connected, and cross sliding clock 20 can slide back and forth along the horizontal slide 21 being fixed on framework memorial archway 1, be designed with cross sliding clock 20
Be hinged slide bar 9, link lever suspension fork 5 can slide in hinge slide bar 9, while be hinged slide bar 9 can be around the hinge rotation in cross sliding clock 20
Turn.The front end of link lever suspension fork 5 is connected with side support roller box 12, and side support roller box 12 can be individually replaced.Side support roller box 12 mainly wraps
Include main back lining bearing 11(Stress is big), secondary back lining bearing 13(Stress is relatively small)With side support roller 14, side support roller 14 during work
Horizontal force is born with the contact of working roll 15, final level power is by conduction by vertical slideway 3 and horizontal slide 21 and two hydraulic pressure
Cylinder 2 and 10 is born.
When lateral support needs support works roller 15, vertical push-and-pull hydraulic cylinder 2 and horizontal push-and-pull hydraulic cylinder 10 are made simultaneously
With whole side support roller box 12 and link lever suspension fork 5 move ahead along specific matched curve, with crossing steel wire and upper during moving ahead
Intermediate calender rolls 8 and lower intermediate calender rolls 16 keep setting safe not interference distance as boundary.Had during being moved ahead due to lateral support vertical
With the displacement in horizontal direction, while rotate again.Detailed process is as follows:Vertical push-and-pull hydraulic cylinder 2 promotes vertical slipper
19 slide in vertical sliding 3, all occur with the rotation link lever suspension fork 5 being connected of hinge 4 and the side support roller box 12 installed thereon
Rotate, meanwhile, horizontal push-and-pull hydraulic cylinder 10 also promotes cross sliding clock 20 interior to preceding sliding in horizontal slide 21, on cross sliding clock 20
The be hinged slide bar 9 of design and installation rotates around its hinge, simultaneously because lateral support has horizontal displacement, so link lever suspension fork 5
Can be in be hinged slide bar 9 slidably, to compensate the horizontal displacement of lateral support.When vertical push-and-pull hydraulic cylinder 2 and level push away
Hydraulic cylinder 10 is drawn to reach locked behind operating position, lateral support position is fixed, and working roll 15 abuts against side by horizontal force during work
In support roller 14, the horizontal deflection of working roll 15 is effectively reduced.The lateral support of entrance and exit acts simultaneously during work, protects
Working roll 15 is stepped up when having demonstrate,proved work, in stable rolling state.When needing roll change, pass through the combination of hydraulic cylinder 2 and 10
Motion, is moved to lateral support the roll change position for not influenceing roll change, effectively shortens roll changing time, improve production efficiency.
The vertical push-and-pull hydraulic cylinder 2 of this lateral support and the fitting routines of horizontal push-and-pull hydraulic cylinder motion 10, are to pass through meter
Under the good various operating modes of calculation machine programming(Restrictive condition)Lateral support movement locus, then it is embedded into whole mill control system,
Finally by executive component execution.The whole motion process of lateral support can all be controlled by computer, and position is accurate, Er Qieyun
Dynamic path is various, avoids interfering with other equipment in lateral support motion process, while more most important is two hydraulic pressure
The multiposition of cylinder controls to adjust, and allows the available work roller roll neck scope of eighteen-high mill is wider, and belt steel product can be rolled by having expanded
Kind, milling train applicability and generality are enhanced, improves rate of return on investment.
Clever structure of the present invention, convenient operating maintenance, the good plate shape of finished product being can guarantee that, roll change is quick and time saving and energy saving,
Have than broader market prospects.Any modification, equivalent substitution and improvements done within the spirit and principles of the invention
Deng should be included in the scope of the protection.
Claims (6)
1. a kind of eighteen-high mill working roll horizontal force supporting mechanism, is arranged in pairs in the entrance and exit of each working roll, and close
Steel wire is crossed in milling train to be symmetrical arranged;It is characterized in that including vertical push-and-pull hydraulic cylinder, horizontal push-and-pull hydraulic cylinder, two push-and-pull hydraulic pressure
Cylinder forms connecting rod slider structure, and the end of connecting rod slider structure sets side support roller box, and side support roller box mainly includes main backing
Bearing, secondary back lining bearing, side support roller and roller carriage;Side support roller and working roll contact during work, rolling horizontal force is by side
Support roller conduction is born by two push-and-pull hydraulic cylinders.
2. eighteen-high mill working roll horizontal force supporting mechanism according to claim 1, it is characterised in that:Vertical push-and-pull liquid
The lower section of cylinder pressure and vertical push-and-pull hydraulic cylinder piston rod linearly set vertical slideway, vertical push-and-pull hydraulic cylinder piston-rod end with
Vertical slipper is connected so that vertical slipper can be slided up and down along vertical slideway, while rotation hinge is provided with vertical slipper, even
Bar suspension is with rotating stud connection and can freely being rotated around rotation hinge;The inner side horizontal direction of horizontal push-and-pull hydraulic cylinder set with
Piston rod linearly sets horizontal slide, and horizontal push-and-pull hydraulic cylinder piston-rod end is connected with cross sliding clock, and cross sliding clock can edge
Horizontal slide slides back and forth along steel wire is crossed, and cross sliding clock is provided with hinge slide bar, and link lever suspension fork can slide in hinge slide bar, together
When hinge slide bar can be around the hinge rotation on cross sliding clock.
3. eighteen-high mill working roll horizontal force supporting mechanism according to claim 2, it is characterised in that:Described hinge
Slide bar is section bulk triangular in shape, and a hinge slide bar wherein summit is hinged on cross sliding clock, and with the summit pair
The parallel position in the side answered sets slideway, the link lever suspension fork by the slideway and can along the slideway in hinge slide bar cunning
It is dynamic.
4. eighteen-high mill working roll horizontal force supporting mechanism according to claim 1 or 2, it is characterised in that:Vertically push away
Hydraulic cylinder is drawn to be arranged on the inside of framework memorial archway, vertical slideway and horizontal slide are each attached on framework memorial archway, horizontal push-and-pull hydraulic pressure
Cylinder is fixedly mounted on framework memorial archway.
5. eighteen-high mill working roll horizontal force supporting mechanism according to claim 1, it is characterised in that:Vertical push-and-pull liquid
Cylinder pressure and the equal inbuilt displacement sensor of horizontal push-and-pull hydraulic cylinder.
6. eighteen-high mill working roll horizontal force supporting mechanism according to claim 1, it is characterised in that:Work as lateral support
When needing support works roller, vertical push-and-pull hydraulic cylinder and horizontal push-and-pull hydraulic cylinder act on simultaneously, and whole side support roller box is along spy
Determine matched curve to move ahead, during moving ahead with cross steel wire and upper intermediate calender rolls and lower intermediate calender rolls keep setting safety do not interfere away from
From for boundary.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201710601006.8A CN107470359B (en) | 2017-07-21 | 2017-07-21 | Horizontal force supporting mechanism for working roller of eighteen-roller mill |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710601006.8A CN107470359B (en) | 2017-07-21 | 2017-07-21 | Horizontal force supporting mechanism for working roller of eighteen-roller mill |
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Publication Number | Publication Date |
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CN107470359A true CN107470359A (en) | 2017-12-15 |
CN107470359B CN107470359B (en) | 2024-01-26 |
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CN201710601006.8A Active CN107470359B (en) | 2017-07-21 | 2017-07-21 | Horizontal force supporting mechanism for working roller of eighteen-roller mill |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109500091A (en) * | 2018-12-06 | 2019-03-22 | 中冶南方工程技术有限公司 | Eighteen-high mill working roll side bearing mechanism and its application method, eighteen-high mill |
CN113275382A (en) * | 2020-12-09 | 2021-08-20 | 安德里茨金属德国有限责任公司 | Rolling mill frame |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN85101137A (en) * | 1985-04-01 | 1987-01-24 | 株式会社日立制作所 | Milling train |
US4781052A (en) * | 1985-12-16 | 1988-11-01 | Sms Schliemann-Siemag Aktiengesellschaft | Actuator device for axially moving rolling mill rolls |
CN102513374A (en) * | 2011-12-29 | 2012-06-27 | 一重集团大连设计研究院有限公司 | Transverse multi-section crossed work roller plate shape regulating and controlling method of steel strip rolling mill and regulating and control device thereof |
CN203316479U (en) * | 2013-07-04 | 2013-12-04 | 北京京诚之星科技开发有限公司 | Cold-rolled strip mill |
-
2017
- 2017-07-21 CN CN201710601006.8A patent/CN107470359B/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN85101137A (en) * | 1985-04-01 | 1987-01-24 | 株式会社日立制作所 | Milling train |
US4781052A (en) * | 1985-12-16 | 1988-11-01 | Sms Schliemann-Siemag Aktiengesellschaft | Actuator device for axially moving rolling mill rolls |
CN102513374A (en) * | 2011-12-29 | 2012-06-27 | 一重集团大连设计研究院有限公司 | Transverse multi-section crossed work roller plate shape regulating and controlling method of steel strip rolling mill and regulating and control device thereof |
CN203316479U (en) * | 2013-07-04 | 2013-12-04 | 北京京诚之星科技开发有限公司 | Cold-rolled strip mill |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109500091A (en) * | 2018-12-06 | 2019-03-22 | 中冶南方工程技术有限公司 | Eighteen-high mill working roll side bearing mechanism and its application method, eighteen-high mill |
CN109500091B (en) * | 2018-12-06 | 2024-01-26 | 中冶南方工程技术有限公司 | Side supporting mechanism for working roll of eighteenth roll mill, using method of side supporting mechanism and eighteenth roll mill |
CN113275382A (en) * | 2020-12-09 | 2021-08-20 | 安德里茨金属德国有限责任公司 | Rolling mill frame |
CN113275382B (en) * | 2020-12-09 | 2023-02-28 | 安德里茨金属德国有限责任公司 | Rolling mill frame |
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