CN113680825A - Device and method for correcting deflection deformation of upper stand of vertical roll mill - Google Patents
Device and method for correcting deflection deformation of upper stand of vertical roll mill Download PDFInfo
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- CN113680825A CN113680825A CN202110897196.9A CN202110897196A CN113680825A CN 113680825 A CN113680825 A CN 113680825A CN 202110897196 A CN202110897196 A CN 202110897196A CN 113680825 A CN113680825 A CN 113680825A
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- stand
- jack
- upper frame
- rolling mill
- correcting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B28/00—Maintaining rolls or rolling equipment in effective condition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means
Abstract
The invention discloses a deflection deformation correction device and method for an upper stand of a vertical rolling mill, wherein the vertical rolling mill comprises a lower stand and an upper stand, and the device comprises: the lower rack hydraulic jacking unit is arranged at the middle position of the bottom of the lower rack and can jack the lower rack; the upper frame hydraulic jacking unit is arranged between the lower frame and the upper frame and can perform jacking correction on the upper frame; the side correcting units are arranged on the left side and the right side of the upper rack, and can enable the left end and the right end of the upper rack to be bent inwards to approach; and the deformation monitoring unit can detect the deformation degree of the upper frame. The method has the advantages of low process cost, simple operation, safety, rapidness, high efficiency and high quality for correcting the deflection deformation of the upper frame.
Description
Technical Field
The invention relates to the technical field of vertical rolling mills, in particular to a device and a method for correcting deflection deformation of a stand on a vertical rolling mill.
Background
The vertical rolling mill is mainly used for plane plate shape control and correction, uneven widening is easily generated in a forming stage and a widening stage, the vertical rolling edging is carried out on the length direction and the width direction after the forming and the widening, the head and tail plate shape is corrected in the length direction, the edge plate shape is corrected in the width direction, the irregular tongue and fish tail deformation of the head and the tail is prevented, the width change in the length direction and the edge folding are prevented, and the target value of the plate width is ensured.
The frame on the vertical roller mill does not completely release stress and effective finished product protection measures are not adopted in the transportation process, and the frame is easy to generate deflection deformation in the transportation process. Therefore, in the process of installing the upper frame and the lower frame of the vertical rolling mill, the installation precision of the installation positions of the upper frame and the lower frame cannot meet the requirement of design precision due to deflection deformation of the frames.
The vertical roll mill frame generates deflection deformation, the frame is heavy, the factory return maintenance cost is high, the transportation period is long, secondary deformation can be caused in the transportation process, the factory return maintenance can not be successful when no good solution is found, the vertical roll mill can be wasted and manufactured again, the cost is greatly improved, and the construction period can not be guaranteed.
Disclosure of Invention
In view of the above, it is necessary to provide a device and a method for correcting deflection deformation of a stand on a vertical rolling mill, which are simple in operation, safe, efficient and low in cost.
A device for correcting deflection of an upper stand of a vertical rolling mill, the vertical rolling mill including a lower stand and an upper stand, the device comprising:
the lower rack hydraulic jacking unit is arranged at the middle position of the bottom of the lower rack and can jack the lower rack;
the upper frame hydraulic jacking unit is arranged between the lower frame and the upper frame and can perform jacking correction on the upper frame;
the side correcting units are arranged on the left side and the right side of the upper rack, and can enable the left end and the right end of the upper rack to be bent inwards to approach;
and the deformation monitoring unit can detect the deformation degree of the upper frame.
In one embodiment, the lower frame hydraulic jacking unit comprises a first jack and a first gasket, the bottom of the first jack is arranged at the middle position of the bottom of the lower frame, and a piston rod of the first jack is in contact with the lower surface of the lower frame through the first gasket.
In one embodiment, the upper frame hydraulic jacking unit comprises I-shaped steel, a second jack and a second gasket, the I-shaped steel is fixed on the front side and the rear side of the middle position of the upper surface of the lower frame, the bottom of the second jack is fixed on the upper surface of the I-shaped steel, and a piston rod of the second jack is in contact with the lower surface of the upper frame through the second gasket.
In one embodiment, the side straightening unit includes a stud bolt, a stopper, a third jack and a fourth jack, one end of the stud bolt is fixed on the lower frame and the upper frame, the other end of the stud bolt is connected with the stopper, the third jack is arranged between the stopper and the lower frame, the fourth jack is arranged between the stopper and the upper frame, and a third gasket and a fourth gasket are arranged between the piston rods of the third jack and the fourth jack and the stopper.
In one embodiment, the deformation monitoring unit is a dial indicator, the dial indicator is fixed on the inner sides of the left end and the right end of the lower rack, and a pointer of the dial indicator is in contact with the upper rack.
In one embodiment, the lower frame and the upper frame are fixedly installed through an interference fit of a shrink ring of the vertical rolling mill.
In one embodiment, a plurality of groups of foundation bolts are respectively arranged on the front side and the rear side of the lower frame, and bases are arranged at the bottoms of the left side and the right side of the lower frame.
A method for correcting deflection deformation of a stand on a vertical rolling mill comprises the following steps:
s1, detecting the deflection deformation of the upper frame;
s2, installing a deflection deformation correction device of an upper rack of the vertical rolling mill;
s3, correcting the deflection deformation of the upper frame;
s4, mounting a vertical rolling mill contraction ring;
and S5, retesting the upper frame after being corrected.
In one embodiment, the step S3 includes the following steps:
s31, applying load by the hydraulic jacking unit of the lower frame, and extending the left end and the right end of the lower frame outwards under the stress state;
s32, applying load to the upper frame hydraulic jacking unit, wherein the middle position of the upper frame is supported by an upward supporting force, and the left end and the right end of the upper frame extend inwards under the self gravity;
s33, applying load by the fourth jack, and applying inward force to the left and right side end parts of the upper frame; the third jack simultaneously applies load to support the lower rack and the stop block;
and S34, observing the data change condition of the dial indicator at any time while applying the load, and recording.
In one embodiment, the applied load force of the lower frame hydraulic jacking unit is greater than the applied load force of the upper frame hydraulic jacking unit.
The device and the method for correcting the deflection deformation of the upper frame of the vertical rolling mill solve the problem of deflection deformation of the upper frame and avoid the problems of factory return processing, secondary deformation or remanufacturing and the like caused by the deflection deformation of the upper frame; meanwhile, the invention has the advantages of low process cost, simple operation, safety, rapidness, high efficiency and high quality for correcting the deflection deformation of the upper frame.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the deflection deformation of the upper housing of the present invention;
FIG. 2 is a schematic structural view of the device for correcting deflection of a stand on a vertical rolling mill of the present invention;
FIG. 3 is a flow chart of the method for correcting the deflection deformation of the stand on the vertical rolling mill.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1-2, an embodiment of the present invention provides an apparatus for correcting deflection deformation of an upper stand of a vertical rolling mill, the vertical rolling mill including a lower stand 1 and an upper stand 2, the apparatus including: the device comprises a lower frame hydraulic jacking unit 3, an upper frame hydraulic jacking unit 4, a side correcting unit 5 and a deformation monitoring unit 6.
The lower rack hydraulic jacking unit 3 is arranged at the middle position of the bottom of the lower rack 1, and the lower rack hydraulic jacking unit 3 can jack the lower rack 1; the upper frame hydraulic jacking unit 4 is arranged between the lower frame 1 and the upper frame 2, and the upper frame hydraulic jacking unit 4 can jack and correct the upper frame 2; the side correcting units 5 are arranged at the left side and the right side of the upper frame 2, and the side correcting units 5 can enable the left end and the right end of the upper frame 2 to bend inwards to approach; the deformation monitoring unit 6 is capable of detecting the degree of deformation of the upper frame 2.
In an embodiment of the present invention, the lower frame hydraulic jacking unit 3 includes a first jack 31 and a first gasket 32, the bottom of the first jack 31 is disposed at a middle position of the bottom of the lower frame 1, and a piston rod of the first jack 31 contacts with the lower surface of the lower frame 1 through the first gasket 32. In this embodiment, the lower frame 1 is similar to a rectangular frame, the first jacks 31 are disposed at front and rear sides of a middle position of the lower frame 1, that is, the first jacks 31 are supported at two opposite sides of the rectangular frame, and the first gasket 32 is mainly disposed to protect the lower frame 1.
In an embodiment of the present invention, the upper frame hydraulic jacking unit 4 includes an i-steel 41, a second jack 42, and a second gasket 43, the i-steel 41 is fixed at front and rear sides of a middle position of the upper surface of the lower frame 1, a bottom of the second jack 42 is fixed on the upper surface of the i-steel 41, and a piston rod of the second jack 42 contacts with a lower surface of the upper frame 2 through the second gasket 43. In this embodiment, the second jack 42 corresponds to the first jack 31 in position, so when the second jack 42 applies a load, the first jack 31 can directly support and reduce the deformation of the second jack 42 to the reaction force of the lower frame 1, and the first jack 31 can also correct the deflection deformation of the lower frame 1 itself, so that the loading force of the first jack 31 is greater than the load applied by the second jack 42.
In an embodiment of the present invention, the lateral straightening unit 5 includes a stud bolt 51, a stopper 52, a third jack 53 and a fourth jack 54, one end of the stud bolt 51 is fixed to the lower frame 1 and the upper frame 2, the other end of the stud bolt 51 is connected to the stopper 52, the third jack 53 is disposed between the stopper 52 and the lower frame 1, and the fourth jack 54 is disposed between the stopper 52 and the upper frame 2, wherein a third gasket 55 and a fourth gasket 56 are disposed between the piston rods of the third jack 53 and the fourth jack 54 and the stopper 52. The third and fourth spacers 55 and 56 can protect the stopper 52 and reduce the impact of the third and fourth jacks 53 and 54 on the stopper 52.
It should be noted that the side straightening unit 5 of the present invention is disposed at a position where the lower frame 1 and the upper frame 2 are butted. Stud bolts 51 are arranged in bolt holes on the left side and the right side of the lower frame 1, one end of the stud bolts is fixed with the lower frame 1 through nuts, and the other end of the stud bolts is fixed with a stop block 52 through nuts. The fixing mode of the upper frame 2 and the stop block 52 is basically the same as that of the lower frame 1, and the main functions are as follows: the fourth jack 54 is used for dynamically applying load to correct deflection deformation of the upper frame 2, and the third jack 53 is matched with the third gasket 55 to play a role in supporting force.
In an embodiment of the present invention, the deformation monitoring unit 6 is a dial indicator, the dial indicator is fixed inside the left and right ends of the lower frame 1, and a pointer of the dial indicator contacts with the upper frame 2. In this embodiment, the pointer of the dial indicator contacts with the upper frame 2, and the pointer is calibrated in the using process, so that the correcting process can be detected.
Optionally, the lower frame 1 and the upper frame 2 are fixed by interference fit through a shrink ring 7 of the vertical rolling mill. For example, the lower frame 1 and the upper frame 2 are respectively provided with a semicircular bulge, the two bulges can mutually enclose to form a circular truncated cone, and then the shrink ring 7 of the vertical rolling mill is sleeved on the circular truncated cone in an interference manner, so that the lower frame 1 and the upper frame 2 can be fixedly connected, and the connection is simple and convenient.
In an embodiment of the present invention, a plurality of groups of anchor bolts 8 are respectively disposed on the front side and the rear side of the lower frame 1, and bases 9 are disposed at the bottoms of the left side and the right side of the lower frame 1.
Referring to fig. 3, an embodiment of the present invention provides a method for correcting deflection deformation of a stand on a vertical rolling mill, which includes the following steps:
s1, detecting the deflection deformation of the upper frame 2;
s2, installing a deflection deformation correction device of an upper rack of the vertical rolling mill;
s3, correcting the deflection deformation of the upper frame 2;
s4, installing a vertical rolling mill contraction ring 7;
and S5, retesting the upper frame 2 after correction.
In step S1 of the present invention, the detecting the deflection deformation amount of the upper frame 2 includes: after the lower frame 1 and the upper frame 2 are installed in a butt joint mode, detecting the butt joint installation position of the lower frame 1 and the upper frame 2 by using a feeler gauge according to the installation precision requirement of an installation manual of a vertical rolling mill, and judging whether the installation size precision requirement of the butt joint position meets the design requirement; after the feeler gauge is detected, if the feeler gauge cannot meet the requirement of installation precision, the upper rack 2 is subjected to omnibearing scanning retest by using a three-dimensional laser detector so as to determine whether the upper rack 2 has deflection deformation.
In step S2 of the present invention, the device for correcting deflection of a stand mounted on a vertical rolling mill comprises: a first jack 31 is respectively placed at the bottom of the middle position of the two sides of the lower frame 1, and a first gasket 32 is placed at the contact position of the first jack 31 and the lower frame 1; a group of I-shaped steel 41 is respectively arranged at the front side and the rear side between the lower rack 1 and the upper rack 2, a second jack 42 is arranged at the upper part of the I-shaped steel 41, and a second gasket 43 is arranged at the contact position of the second jack 42 and the upper rack 1; four groups of stud bolts 51 are respectively placed on the left side and the right side of the vertical rolling mill, one end of each stud bolt 51 is fixed with a stop block 52 nut, the other end of each stud bolt 51 is fixed with the lower rack 1 and the upper rack 2 nuts, then a third jack 53, a fourth jack 54 and a dial indicator are installed, and the pointer of the dial indicator is in contact with the upper rack 2 and used for data measurement and detection; finally, a shrink ring 7 is placed at the connection position of the lower frame 1 and the upper frame 2. It should be noted that after the installation of the present invention is completed, eight groups of anchor bolts 8 in the middle of the front and rear sides of the lower frame 1 need to be loosened, and the anchor bolts 8 (the anchor bolts connected to the base 9) at the left and right ends need to be tightened.
In an embodiment of the present invention, the step S3 includes the following steps:
s31, applying a load by the lower frame hydraulic jacking unit 3, and extending the left end and the right end of the lower frame 1 outwards under a stressed state;
s32, applying a load by the upper frame hydraulic jacking unit 4, wherein the middle position of the upper frame 2 is supported by an upward supporting force, and the left end and the right end of the upper frame are extended inwards by self gravity;
s33, the fourth jack 54 applies a load to apply an inward force to the left and right ends of the upper frame 2; the third jack 53 simultaneously applies load to support the lower frame 1 and the stopper 52;
and S34, observing the data change condition of the dial indicator at any time while applying the load, and recording. Therefore, whether the upper stand of the vertical rolling mill is in the correcting process or not is confirmed, and the feeler gauge is used for detecting the installation accuracy of the vertical rolling mill at any time to judge whether the design requirements are met or not.
In step S4 of the present invention, the step of installing the edger shrink ring 7 includes: before installation, the four shrink rings 7 are heated simultaneously, and after the shrink rings are expanded to a certain degree, the shrink rings 7 are installed on a vertical rolling mill, so that the lower frame 1 and the upper frame 2 are fixedly installed.
In step S5 of the present invention, the retesting after the upper frame is corrected includes: after the shrink ring 7 is installed, the feeler gauge is used again to perform precision retest on the installation positions of the lower frame 1 and the upper frame 2, and the three-dimensional laser detector is used to perform retest on the deflection deformation correction of the upper frame 2, so that the installation of the vertical rolling mill is ensured to meet the design requirements and the subsequent use requirements.
In an embodiment of the present invention, the lower frame hydraulic jacking unit 3 not only can play a supporting role to reduce the deformation of the upper frame hydraulic jacking unit 4 to the reaction force of the lower frame 1, but also the lower frame hydraulic jacking unit 3 can correct the deflection deformation of the lower frame 1, so that the applied load force of the lower frame hydraulic jacking unit 3 is greater than the applied load force of the upper frame hydraulic jacking unit 4.
In conclusion, the device and the method for correcting deflection deformation of the upper frame of the vertical rolling mill solve the problem of deflection deformation of the upper frame and avoid the problems of factory return processing, secondary deformation or remanufacturing and the like caused by deflection deformation of the upper frame; meanwhile, the invention has the advantages of low process cost, simple operation, safety, rapidness, high efficiency and high quality for correcting the deflection deformation of the upper frame.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-described examples merely represent several embodiments of the present application and are not to be construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A deflection deformation correcting device for an upper stand of a vertical rolling mill, wherein the vertical rolling mill comprises a lower stand and an upper stand, and is characterized by comprising the following components:
the lower rack hydraulic jacking unit is arranged at the middle position of the bottom of the lower rack and can jack the lower rack;
the upper frame hydraulic jacking unit is arranged between the lower frame and the upper frame and can perform jacking correction on the upper frame;
the side correcting units are arranged on the left side and the right side of the upper rack, and can enable the left end and the right end of the upper rack to be bent inwards to approach;
and the deformation monitoring unit can detect the deformation degree of the upper frame.
2. The device for correcting deflection of a stand on a vertical rolling mill according to claim 1, wherein the lower stand hydraulic jacking unit includes a first jack, a bottom of which is provided at a bottom intermediate position of the lower stand, and a first spacer, and a piston rod of which is in contact with a lower surface of the lower stand via the first spacer.
3. The device for correcting the deflection of the upper stand of the vertical rolling mill according to claim 2, wherein the hydraulic jacking unit of the upper stand comprises an i-steel, a second jack and a second gasket, the i-steel is fixed on the front side and the rear side of the middle position of the upper surface of the lower stand, the bottom of the second jack is fixed on the upper surface of the i-steel, and a piston rod of the second jack is in contact with the lower surface of the upper stand through the second gasket.
4. The device for correcting deflection of a stand on a vertical rolling mill according to claim 3, wherein the side correcting unit comprises a stud bolt, a stopper, a third jack and a fourth jack, one end of the stud bolt is fixed to the lower stand and the upper stand, the other end of the stud bolt is connected to the stopper, the third jack is disposed between the stopper and the lower stand, and the fourth jack is disposed between the stopper and the upper stand, wherein a third gasket and a fourth gasket are disposed between the piston rods of the third jack and the fourth jack and the stopper.
5. The device for correcting the deflection of the upper frame of the vertical rolling mill according to claim 1, wherein the deformation monitoring unit is a dial indicator, the dial indicator is fixed on the inner sides of the left end and the right end of the lower frame, and a pointer of the dial indicator is in contact with the upper frame.
6. The device for correcting deflection of an upper stand of a vertical rolling mill according to claim 1, wherein the lower stand and the upper stand are fixedly installed by interference fit of a shrink ring of the vertical rolling mill.
7. The device for correcting the deflection of the upper frame of the vertical rolling mill according to claim 1, wherein a plurality of groups of anchor bolts are respectively arranged on the front side and the rear side of the lower frame, and bases are arranged at the bottoms of the left side and the right side of the lower frame.
8. The method for correcting the deflection deformation of the upper stand of the vertical rolling mill is characterized by comprising the following steps of:
s1, detecting the deflection deformation of the upper frame;
s2, installing the device for correcting the deflection deformation of the stand on the vertical rolling mill according to any one of the claims 1 to 7;
s3, correcting the deflection deformation of the upper frame;
s4, mounting a vertical rolling mill contraction ring;
and S5, retesting the upper frame after being corrected.
9. The method for correcting deflection of a stand on a vertical rolling mill according to claim 8, wherein said step S3 includes the steps of:
s31, applying load by the hydraulic jacking unit of the lower frame, and extending the left end and the right end of the lower frame outwards under the stress state;
s32, applying load to the upper frame hydraulic jacking unit, wherein the middle position of the upper frame is supported by an upward supporting force, and the left end and the right end of the upper frame extend inwards under the self gravity;
s33, applying load by the fourth jack, and applying inward force to the left and right side end parts of the upper frame; the third jack simultaneously applies load to support the lower rack and the stop block;
and S34, observing the data change condition of the dial indicator at any time while applying the load, and recording.
10. The method for correcting deflection of an upper stand of a vertical rolling mill according to claim 9, wherein an application load force of the hydraulic jacking unit of the lower stand is larger than an application load force of the hydraulic jacking unit of the upper stand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110897196.9A CN113680825B (en) | 2021-08-05 | 2021-08-05 | Deflection deformation correction device and method for upper frame of vertical roller mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110897196.9A CN113680825B (en) | 2021-08-05 | 2021-08-05 | Deflection deformation correction device and method for upper frame of vertical roller mill |
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| CN113680825A true CN113680825A (en) | 2021-11-23 |
| CN113680825B CN113680825B (en) | 2023-05-12 |
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| CN202110897196.9A Active CN113680825B (en) | 2021-08-05 | 2021-08-05 | Deflection deformation correction device and method for upper frame of vertical roller mill |
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| JPS60240313A (en) * | 1984-05-15 | 1985-11-29 | Kawasaki Steel Corp | Rolling method by rolling mill provided with split roll for adjusting deflection of work roll |
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| CN101941028A (en) * | 2010-09-01 | 2011-01-12 | 中国二冶集团有限公司 | Device and method for correcting spatially-downwarped steel beam |
| CN206981474U (en) * | 2017-07-21 | 2018-02-09 | 中国铁建重工集团有限公司 | A kind of F rails correcting device |
| CN108453150A (en) * | 2018-01-31 | 2018-08-28 | 成都大陆激光技术有限公司 | Bending shaft degree detects correcting tool |
| CN109530485A (en) * | 2019-01-28 | 2019-03-29 | 肖成美 | A kind of huge I-steel correction system |
| CN109570276A (en) * | 2019-01-16 | 2019-04-05 | 中国长江电力股份有限公司 | Upper Bracket of Hydro Generating Set distortion correction frame and application method |
| CN112139297A (en) * | 2020-10-10 | 2020-12-29 | 常州伟泰科技股份有限公司 | Multifunctional correcting device for frame workpiece |
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2021
- 2021-08-05 CN CN202110897196.9A patent/CN113680825B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60240313A (en) * | 1984-05-15 | 1985-11-29 | Kawasaki Steel Corp | Rolling method by rolling mill provided with split roll for adjusting deflection of work roll |
| CN2370993Y (en) * | 1998-10-21 | 2000-03-29 | 唐国君 | Multifunctional mobile hydraulic bed |
| CN101941028A (en) * | 2010-09-01 | 2011-01-12 | 中国二冶集团有限公司 | Device and method for correcting spatially-downwarped steel beam |
| CN206981474U (en) * | 2017-07-21 | 2018-02-09 | 中国铁建重工集团有限公司 | A kind of F rails correcting device |
| CN108453150A (en) * | 2018-01-31 | 2018-08-28 | 成都大陆激光技术有限公司 | Bending shaft degree detects correcting tool |
| CN109570276A (en) * | 2019-01-16 | 2019-04-05 | 中国长江电力股份有限公司 | Upper Bracket of Hydro Generating Set distortion correction frame and application method |
| CN109530485A (en) * | 2019-01-28 | 2019-03-29 | 肖成美 | A kind of huge I-steel correction system |
| CN112139297A (en) * | 2020-10-10 | 2020-12-29 | 常州伟泰科技股份有限公司 | Multifunctional correcting device for frame workpiece |
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| CN113680825B (en) | 2023-05-12 |
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