CN108015110B - Axial positioning device for intermediate roll system of twenty-high rolling mill - Google Patents
Axial positioning device for intermediate roll system of twenty-high rolling mill Download PDFInfo
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- CN108015110B CN108015110B CN201711447015.2A CN201711447015A CN108015110B CN 108015110 B CN108015110 B CN 108015110B CN 201711447015 A CN201711447015 A CN 201711447015A CN 108015110 B CN108015110 B CN 108015110B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- 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
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- 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
- B21B31/07—Adaptation of roll neck bearings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
The invention provides an axial positioning device of a middle roller system of a twenty-high rolling mill, which comprises a frame, a transmission side-shifting roller cylinder, an operation side-shifting roller cylinder, a front door, a rear door, a roller system and a thrust bearing device, wherein the roller system comprises a working roller and the middle roller system, the front door and the rear door are respectively arranged on two sides of the frame, the operation side-shifting roller cylinder is arranged on the outer side of the front door, the transmission side-shifting roller cylinder is arranged on the outer side of the rear door, the thrust bearing devices are arranged on two ends of the middle roller system, one thrust bearing device at one end is connected with the operation side-shifting roller cylinder, and the thrust bearing device at the other end is connected with the transmission side-shifting roller cylinder. The axial positioning device of the intermediate roll system of the twenty-high rolling mill has the following advantages: the middle roller system is convenient to grind directly without disassembling the roller system, so that the structure of the roller system is simplified, the bearing stress is more effective, the bearing is stressed in a larger stress direction, and the service life of the bearing is prolonged.
Description
Technical Field
The invention belongs to the field of metallurgical steel rolling mechanical equipment, and particularly relates to an axial positioning device for a middle roller system of a twenty-high rolling mill.
Background
The production level of steel is an important indicator for measuring the modernization level of a country. The cold-rolled steel strip always occupies an important proportion in steel yield, is widely applied to the fields of civil use, industry, construction, subway and the like, and shows excellent mechanical properties. With the rapid development of economy, the product yield requirement is increased, the product quality is higher, the requirement on production equipment is higher, and the equipment performance and the production efficiency are very necessary to be improved, so that the structural function of the rolling mill is required to be enhanced, and the operation time and the roller system disassembly time are required to be saved.
The cold rolling twenty-high rolling mill used at present comprises three twenty-high rolling mills of Sendzimir integral housing, sendweller four-column type and Fronding traditional frame type. The rolling mill is used for rolling high-performance materials such as carbon steel, stainless steel, hard alloy and the like, and is used for rolling thin strips or extremely thin strips. The twenty-high rolling mill is composed of a middle roller system and two middle roller systems which are vertically symmetrical, and the two middle rollers are divided into two middle driving rollers and two middle idler rollers. For a roller system with a middle roller adopting a push-push type structure, the two ends of the middle roller are provided with bearings and bearing seats to realize axial positioning, and the axial positioning is in friction contact with a thrust block at the head part of a roller shifting cylinder. For the two middle driving roller systems, the driving side is connected with the coupling, and one end of the operating side is provided with a bearing and a bearing seat to realize axial positioning and is in friction contact with a thrust block on the front door. For the two middle idler roller systems, the two ends are provided with bearings and bearing seats to realize axial positioning and are in friction contact with thrust blocks at the heads of the roller shifting cylinders. The center lines of all bearings of the roll system are coincident with the center line of the two intermediate rolls, are positioned on the same center line and are connected to the end parts of the rolls to form an independent roll system.
The invention breaks the conventional mechanism, changes the prior bearing and bearing seat to be fixed on the roller, and places the bearing and bearing seat on the front door, the rear door and the roller shifting hydraulic cylinder friction blocks on the front door and the rear door, the center line of the roller is vertical to the center line of the bearing, and the end part of the roller and the outer ring of the bearing are in rolling friction state. Under the condition, the first intermediate roller and the second intermediate roller are in a bare roller state like the working roller, so that the roller system is convenient to directly grind without disassembling, and the structure of the roller system is simplified. In addition, from the perspective of bearing stress, the bearing bears load in a larger stress direction, so that the service life of the bearing is prolonged.
Disclosure of Invention
In view of the above, the present invention aims to provide an axial positioning device for an intermediate roll system of a twenty-high rolling mill, which can solve the above-mentioned technical problems.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the utility model provides a twenty high rolling mill intermediate roll system axial positioning device, includes frame, transmission side scurring roller jar, operation side scurring roller jar, qianmen, back door, roller system and thrust bearing device, and the roller system includes work roll and intermediate roll system, qianmen and back door are installed respectively in the both sides of frame, and the outside of qianmen is installed the operation side scurring roller jar, and the outside of back door is installed the transmission side scurring roller jar, and the both ends of intermediate roll system all are equipped with thrust bearing device, and thrust bearing device of one end is connected the operation side scurring roller jar, and thrust bearing device of the other end is connected the transmission side scurring roller jar.
The middle roller system comprises a first middle roller, a second middle idler roller and a second middle driving roller, the second middle idler roller and the second middle driving roller are arranged on the outer layer of the first middle roller, the working roller is arranged on the innermost layer, the thrust bearing device comprises a first middle thrust bearing device, a second middle thrust bearing device, a working roller thrust bearing device and a driving side second middle idler roller thrust bearing device, the first middle thrust bearing device is arranged at two ends of the first middle roller, the second middle idler roller and the driving side of the second middle driving roller are provided with the second middle thrust bearing device, the driving side of the second middle idler roller is provided with the driving side second middle idler roller thrust bearing device, and the two ends of the working roller are provided with the working roller thrust bearing device.
Further, the middle thrust bearing device of the second layer comprises a first bearing seat, a pin shaft, roller bearings, a spacer bush and a baffle, wherein the first bearing seat is fixed on the front door, the two roller bearings are fixedly penetrated on the first bearing seat through the pin shaft, the two roller bearings are respectively in rolling contact with the end parts of the middle driving roller of the second layer and the end parts of the middle idler roller of the second layer, the center line of the middle driving roller of the second layer and the center line of the middle idler roller of the second layer are in a vertical state with the center line of the roller bearings, and the spacer bush is arranged between the two roller bearings.
Further, a slot is formed in the bottom of the pin shaft, a baffle is inserted into the slot, and the baffle is clamped at the lower end of the first bearing seat to limit the pin shaft.
Further, the thrust bearing device of the second intermediate idler roller on the transmission side comprises a roller bearing, a first mandrel, a nut and a second bearing, wherein the second bearing is fixed on the rear door, one roller bearing is fixed on the second bearing through the first mandrel and the nut, the roller bearing is in rolling contact with the end part of the transmission side of the second intermediate idler roller, and the center line of the second intermediate idler roller is in a vertical state with the center line of the roller bearing.
Further, the middle thrust bearing device of the first layer comprises roller bearings, a second mandrel, bolts and a third bearing seat, thrust blocks are fixed at the ends of cylinder rods of the transmission side-shifting roller cylinders and the operation side-shifting roller cylinders, the third bearing seat is fixed on the thrust blocks, the two roller bearings penetrate through the second mandrel, the upper end and the lower end of the second mandrel are fixed on the third bearing seat through the bolts, the center line of the middle roller of the first layer is in a vertical state with the center line of the roller bearings, and the ends of the middle roller of the two first layers are in rolling contact with outer rings of the two roller bearings respectively.
Further, the axial lead of the bolt is perpendicular to the central lead of the second mandrel.
Further, the outer layer of the intermediate roll system is provided with a backing roll.
Further, the roller system comprises an upper roller system unit and a lower roller system unit which are symmetrically arranged, each roller system unit comprises four backing rollers, two second-layer middle driving rollers, a second-layer middle idler roller, two first-layer middle rollers and a working roller, the four backing rollers are positioned on the outermost layer, the working roller is positioned on the innermost layer, the two first-layer middle rollers are in direct contact with the working roller, and the second-layer middle idler roller is positioned between the two first-layer middle rollers.
Compared with the prior art, the twenty-high rolling mill intermediate roll system axial positioning device has the following advantages: the middle roller system is convenient to grind directly without disassembling the roller system, so that the structure of the roller system is simplified, the bearing stress is more effective, the bearing is stressed in a larger stress direction, and the service life of the bearing is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of the structure of the present invention applied to a rolling mill;
FIG. 2 is a right side view of the front door of FIG. 1;
FIG. 3 is a schematic left-hand structural view of the rear door of FIG. 1;
FIG. 4 is a schematic view of a roller train arrangement (like letters indicate like parts);
FIG. 5 is a cross-sectional view taken along the A-A plane in FIG. 2;
FIG. 6 is a cross-sectional view taken along the B-B plane in FIG. 2;
FIG. 7 is a cross-sectional view taken along the plane C-C in FIG. 3;
reference numerals illustrate:
1-a transmission side-shifting roller cylinder; 2-a rear door; 3-a second layer intermediate idler roller; 4-a first layer intermediate roll; 5-a work roll; 6-a frame; 7-front door; 8-operating a side blow-by cylinder; 9-a first layer intermediate thrust bearing arrangement; 10-a second layer intermediate thrust bearing arrangement; 11-a work roll thrust bearing device; 12-a thrust bearing device of a second intermediate idler roller on the transmission side; 13-backing roll; 14-a second layer intermediate driving roller; 15-pin shafts; 16-roller bearings; 17-spacer bush; 18-a first bearing seat; 19-a baffle; 20-bolts; 21-a second mandrel; 22-a third bearing; 23-thrust blocks; 24-nut; 25-a first mandrel; 26-a second bearing seat.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1-7, an axial positioning device for a middle roll system of a twenty-high rolling mill comprises a frame 6, a transmission side-shifting roll cylinder 1, an operation side-shifting roll cylinder 8, a front door 7, a rear door 2, a roll system and thrust bearing devices, wherein the roll system is arranged on a bearing seat and comprises a working roll 5 and a middle roll system, the front door 7 and the rear door 2 are respectively arranged on two sides of the frame 6, the operation side-shifting roll cylinder 8 is arranged on the outer side of the front door 7, the transmission side-shifting roll cylinder 1 is arranged on the outer side of the rear door 2, the thrust bearing devices are arranged on two ends of the middle roll system, the thrust bearing devices on one end are connected with the operation side-shifting roll cylinder 8, and the thrust bearing devices on the other end are connected with the transmission side-shifting roll cylinder 1.
The middle roller system comprises a first middle roller 4, a second middle idler roller 3 and a second middle driving roller 14, the second middle idler roller 3 and the second middle driving roller 14 are arranged on the outer layer of the first middle roller 4, the working roller 5 is arranged on the innermost layer, the thrust bearing device comprises a first middle thrust bearing device 9, a second middle thrust bearing device 10, a working roller thrust bearing device 11 and a driving side two middle idler roller thrust bearing device 12, the first middle thrust bearing device 9 is arranged at two ends of the first middle roller 4, the second middle thrust bearing device 10 is arranged at the operating side of the second middle idler roller 3 and the operating side of the second middle driving roller 14, the driving side of the second middle idler roller 3 is provided with the driving side two middle idler roller thrust bearing devices 12, and the working roller 5 is provided with the working roller thrust bearing device 11 at two ends.
The second-layer middle thrust bearing device 10 comprises a first bearing seat, a pin shaft, roller bearings, a spacer bush and a baffle, wherein the first bearing seat 18 can be fixed on the front door 7 through bolts, two roller bearings 16 are fixedly penetrated on the first bearing seat 18 through the pin shaft 15, the two roller bearings 16 are respectively in rolling contact with the end part of the second-layer middle driving roller 14 and the end part of the second-layer middle idler roller 3, the central line of the second-layer middle driving roller 14 and the central line of the second-layer middle idler roller 3 are in a vertical state with the central lines of the roller bearings 16, and the spacer bush 17 is arranged between the two roller bearings 16.
The bottom of the pin shaft 15 is provided with a slot, a baffle 19 is inserted into the slot, and the baffle 19 is clamped at the lower end of the first bearing seat 18 to limit the pin shaft 15.
The second intermediate idler roller thrust bearing device 12 on the transmission side comprises a roller bearing 16, a first mandrel 25, a nut 24 and a second bearing 26, the second bearing 26 can be fixed on the rear door 2 through bolts, one roller bearing 16 is fixed on the second bearing 26 through the first mandrel 25 and the nut 24, the roller bearing 16 is in rolling contact with the end part on the transmission side of the second intermediate idler roller 3, and the center line of the second intermediate idler roller 3 is perpendicular to the center line of the roller bearing 16.
The first-layer middle thrust bearing device 9 comprises a roller bearing 16, a second mandrel 21, bolts 20 and a third bearing seat 22, thrust blocks 23 are fixed at the ends of cylinder rods of the transmission side shifting roller cylinder 1 and the operation side shifting roller cylinder 8, the third bearing seat 22 is fixed on the thrust blocks 23, two roller bearings 16 penetrate through the second mandrel 21, the upper end and the lower end of the second mandrel 21 are fixed on the third bearing seat 22 through the bolts 20, the center line of the first-layer middle roller 4 is in a vertical state with the center line of the roller bearing 16, and the ends of the two first-layer middle rollers 4 are respectively in rolling contact with outer rings of the two roller bearings 16.
The axis of the bolt 20 is perpendicular to the axis of the second mandrel 21.
The outer layer of the intermediate roll system is provided with a backing roll 13.
The roller system comprises an upper roller system unit and a lower roller system unit which are symmetrically arranged, each roller system unit comprises four backing rollers 13, two second-layer middle driving rollers 14, a second-layer middle idler roller 3, two first-layer middle rollers 4 and a working roller 5, the four backing rollers 13 are positioned on the outermost layer, the working roller 5 is positioned on the innermost layer, the two first-layer middle rollers 4 are in direct contact with the working roller 5, and the second-layer middle idler roller 3 is positioned between the two first-layer middle rollers 4.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. An axial positioning device of a middle roller system of a twenty-high rolling mill is characterized in that: the device comprises a frame (6), a transmission side-shifting roller cylinder (1), an operation side-shifting roller cylinder (8), a front door (7), a rear door (2), a roller system and a thrust bearing device, wherein the roller system comprises a working roller (5) and a middle roller system, the front door (7) and the rear door (2) are respectively arranged at two sides of the frame (6), the operation side-shifting roller cylinder (8) is arranged at the outer side of the front door (7), the transmission side-shifting roller cylinder (1) is arranged at the outer side of the rear door (2), the thrust bearing device at one end is connected with the operation side-shifting roller cylinder (8), and the thrust bearing device at the other end is connected with the transmission side-shifting roller cylinder (1);
the middle roller system comprises a first middle roller (4), a second middle idler roller (3), a second middle driving roller (14), wherein the second middle idler roller (3) and the second middle driving roller (14) are arranged on the outer layer of the first middle roller (4), the working roller (5) is arranged on the innermost layer, the thrust bearing device comprises a first middle thrust bearing device (9), a second middle thrust bearing device (10), a working roller thrust bearing device (11) and a driving side second middle idler roller thrust bearing device (12), the first middle thrust bearing device (9) is arranged at two ends of the first middle roller (4), the second middle thrust bearing device (10) is arranged at the operating side of the second middle idler roller (3) and the second middle driving roller (14), the driving side of the second middle idler roller (3) is provided with the driving side second middle idler roller thrust bearing device (12), the working roller thrust bearing devices (11) are arranged at two ends of the working roller (5),
the second-layer middle thrust bearing device (10) comprises a first bearing seat, a pin shaft, first roller bearings, a spacer bush and a baffle, wherein the first bearing seat (18) is fixed on the front door (7), the two first roller bearings penetrate through and are fixed on the first bearing seat (18) through the pin shaft (15), the two first roller bearings are respectively in rolling contact with the end part of the second-layer middle driving roller (14) and the end part of the second-layer middle idler roller (3), the central line of the second-layer middle driving roller (14) and the central line of the second-layer middle idler roller (3) are in a vertical state with the central lines of the first roller bearings, the spacer bush (17) is arranged between the two first roller bearings,
the second intermediate idler thrust bearing device (12) at the transmission side comprises a second idler bearing, a first mandrel (25), a nut (24) and a second bearing (26), wherein the second bearing (26) is fixed on the rear door (2), one second idler bearing is fixed on the second bearing (26) through the first mandrel (25) and the nut (24), the second idler bearing is in rolling contact with the transmission side end part of the second intermediate idler (3), the central line of the second intermediate idler (3) is in a vertical state with the central line of the second idler bearing,
the first-layer middle thrust bearing device (9) comprises a third roller bearing, a second mandrel (21), bolts (20) and a third bearing seat (22), thrust blocks (23) are fixed at the ends of cylinder rods of the transmission side-shifting cylinder (1) and the operation side-shifting cylinder (8), the third bearing seat (22) is fixed on the thrust blocks (23), two third roller bearings penetrate through the second mandrel (21), the upper end and the lower end of the second mandrel (21) are fixed on the third bearing seat (22) through the bolts (20), the center line of the first-layer middle roller (4) is in a vertical state with the center line of the third roller bearing, and the ends of the two first-layer middle rollers (4) are respectively in rolling contact with outer rings of the two third roller bearings.
2. The twenty-high mill intermediate roll train axial positioning device of claim 1, wherein: the bottom of the pin shaft (15) is provided with a slot, a baffle (19) is inserted into the slot, and the baffle (19) is clamped at the lower end of the first bearing seat (18) to limit the pin shaft (15).
3. The twenty-high mill intermediate roll train axial positioning device of claim 1, wherein: the axial lead of the bolt (20) is perpendicular to the central lead of the second mandrel (21).
4. The twenty-high mill intermediate roll train axial positioning device of claim 1, wherein: the outer layer of the intermediate roll system is provided with a backing roll (13).
5. The twenty-high mill intermediate roll train axial positioning device of claim 1, wherein: the roller system comprises an upper roller system unit and a lower roller system unit which are symmetrically arranged, each roller system unit comprises four backing rollers (13), two second-layer middle driving rollers (14), a second-layer middle idler roller (3), two first-layer middle rollers (4) and a working roller (5), the four backing rollers (13) are located on the outermost layer, the working roller (5) is located on the innermost layer, the two first-layer middle rollers (4) are in direct contact with the working roller (5), and the second-layer middle idler roller (3) is located between the two first-layer middle rollers (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711447015.2A CN108015110B (en) | 2017-12-27 | 2017-12-27 | Axial positioning device for intermediate roll system of twenty-high rolling mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711447015.2A CN108015110B (en) | 2017-12-27 | 2017-12-27 | Axial positioning device for intermediate roll system of twenty-high rolling mill |
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| Publication Number | Publication Date |
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| CN108015110A CN108015110A (en) | 2018-05-11 |
| CN108015110B true CN108015110B (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711447015.2A Active CN108015110B (en) | 2017-12-27 | 2017-12-27 | Axial positioning device for intermediate roll system of twenty-high rolling mill |
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| CN114472552A (en) * | 2022-03-22 | 2022-05-13 | 武汉钢铁有限公司 | Method for measuring axial clearance of multi-roller mill roller system |
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| CN105764622A (en) * | 2013-11-15 | 2016-07-13 | 法孚斯德姆斯公司 | Multiroll rolling mill incorporating a hatch |
| CN106734224A (en) * | 2017-01-18 | 2017-05-31 | 中国重型机械研究院股份公司 | A kind of milling train valve with buffer unit |
| CN207971207U (en) * | 2017-12-27 | 2018-10-16 | 天津市中重科技工程有限公司 | Mill intermediate calender rolls system axial direction positioning device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07265917A (en) * | 1994-03-28 | 1995-10-17 | Koyo Seiko Co Ltd | Bearing device for work roll of multiple roll mill |
| CN201008886Y (en) * | 2006-12-26 | 2008-01-23 | 郑红专 | Axial direction positioning device of working roller |
| CN201108918Y (en) * | 2007-09-21 | 2008-09-03 | 宁波宝新不锈钢有限公司 | Bracket structure for thrust bearing of rolling mill working roller |
| CN103372574A (en) * | 2012-04-25 | 2013-10-30 | 三菱日立制铁机械株式会社 | Multi-high rolling mill equipped with work roll shift function |
| CN203316489U (en) * | 2013-06-04 | 2013-12-04 | 宁波宝新不锈钢有限公司 | Thrust assembly of rolling mill |
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| CN106734224A (en) * | 2017-01-18 | 2017-05-31 | 中国重型机械研究院股份公司 | A kind of milling train valve with buffer unit |
| CN207971207U (en) * | 2017-12-27 | 2018-10-16 | 天津市中重科技工程有限公司 | Mill intermediate calender rolls system axial direction positioning device |
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| CN108015110A (en) | 2018-05-11 |
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