CN110449462A - A kind of profile rolls rear finishing process - Google Patents
A kind of profile rolls rear finishing process Download PDFInfo
- Publication number
- CN110449462A CN110449462A CN201910761109.XA CN201910761109A CN110449462A CN 110449462 A CN110449462 A CN 110449462A CN 201910761109 A CN201910761109 A CN 201910761109A CN 110449462 A CN110449462 A CN 110449462A
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- China
- Prior art keywords
- profile
- casing
- finishing process
- plate
- rotating turret
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/088—H- or I-sections
-
- 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
- B21D3/02—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 by rollers
- B21D3/05—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 by rollers arranged on axes rectangular to the path of the work
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
The present invention relates to a kind of profiles to roll rear finishing process, including mounting rack, casing, rolling device and apparatus for correcting, the mounting rack upper end is equipped with casing, casing rectangular in cross-section structure, casing internal is symmetrically arranged with rolling device, rolling device is separately mounted to casing internal, and two sides, casing internal are symmetrically arranged with apparatus for correcting up and down.The present invention can solve existing profile after rolling; profile usually there will be the defects of web is eccentric and the edge of a wing tilts; existing finishing process can not align profile; profile repairing effect after leading to finishing is poor; there are still a large amount of defects for profile; and; existing equipment is when aligning profile; rectification effect is poor; easily deformation occurs for section end face, meanwhile, when carrying out straightening processing to various sizes of profile; need replacing that corresponding roller is matched, the problems such as cause the working efficiency of profile low.
Description
Technical field
The present invention relates to profile finishing field, in particular to a kind of profile rolls rear finishing process.
Background technique
H-shaped material is the strip profile that section is I-shaped shape.H-shaped material has the edge of a wing wide, and lateral rigidity is big, bending resistance
The advantages that ability is strong, and two surface of the H-shaped material edge of a wing is parallel to each other so that connecting, processing, simple installation.With I-shaped
Material is applied to production in a large amount of of China, and existing market is more and more to the specification demands of product, to the form and ruler of product
It is very little require it is increasingly strict.
Currently, existing H-shaped material in the finished machined of rolling, usually has the following deficiencies: that 1, profile is rolling
Afterwards, profile usually there will be the defects of web is eccentric and the edge of a wing tilts, and existing finishing process can not rectify profile
Directly, the profile repairing effect after leading to finishing is poor, and there are still a large amount of defects for profile；2, existing equipment is aligned to profile
When, rectification effect is poor, and easily deformation occurs for section end face, meanwhile, when carrying out straightening processing to various sizes of profile, need
It replaces that corresponding roller is matched, causes the working efficiency of profile low.
Summary of the invention
(1) technical problems to be solved
The present invention can solve existing profile after rolling, and profile usually there will be web is eccentric and the edge of a wing tilts etc.
Defect, existing finishing process can not align profile, and the profile repairing effect after leading to finishing is poor, profile there are still
A large amount of defect, moreover, existing equipment, when aligning to profile, rectification effect is poor, easily deformation occurs for section end face, together
When, it when carrying out straightening processing to various sizes of profile, needs replacing that corresponding roller is matched, leads to the work of profile
Make the inferior problem of low efficiency.
(2) technical solution
To achieve the goals above, the present invention uses following technical scheme, and a kind of profile rolls rear finishing process, including following
Step:
S1, blank heating: manually the furnace charging table to heating furnace is sent to be internally heated steel blank；
S2, blank rolling: it is I-shaped structure that the blank after heating in step S1 is pricked unit to be rolled into section through roller
Profile；
S3, cooling down: the profile after step S2 rolling is placed on cold bed and carries out cooling down；
S4, removing surface: by artificial mode that profile iron filings remained on surface, iron scale etc. in step S3 is miscellaneous
Matter；
S5, roll-in aligning: the profile after clearing up in step S4 being put into inside rolling device and is conveyed, apparatus for correcting pair
Profile carries out straightening operation；
S6, spray painting: spray painting antirust is carried out to the plate after aligning in step S5；
S7, drying: the profile after painting in step S6 is put into naturally dry in air；
S8, storage storage: the profile after drying in step S7 is subjected to storage storage；
Above-mentioned profile roll flow chart of the rear finishing process in S1-S8 step need to by mounting rack, casing, rolling device and
Corresponding processing operation is completed in apparatus for correcting cooperation.
The mounting rack upper end is equipped with casing, casing rectangular in cross-section structure, and casing internal is symmetrically arranged with roll-in
Device, rolling device are separately mounted to casing internal two sides up and down, and casing internal is symmetrically arranged with apparatus for correcting, apparatus for correcting point
It is not mounted at left and right sides of casing internal.
The apparatus for correcting includes driving motor, rotation axis and correct roller, and the casing internal is provided with correct roller,
Correct roller is connected by rotation axis casing, is symmetrically installed with driving motor, the output of driving motor by motor cabinet on mounting rack
Axis is by shaft coupling and rotation axis connection, and when specific works, driving motor drives correct roller to be rotated by rotation axis, correction
The profile for phenomena such as roller can tilt the web bias of appearance and the edge of a wing carries out aligning processing.
The correct roller includes rotating turret, adjusts branch, support branch and support plate, and the rotating turret is round knot
Structure, rotating turret are internally provided with cavity, and cavity inside is equipped with adjusting branch, is symmetrically arranged with support plate on the outside of rotating turret, props up
Fagging is cirque structure, and support plate is by way of being slidably matched and rotates axis connection, is symmetrically installed with support on rotating turret
Branch is fixedly connected on the outside of support branch with support plate, is close on the inside of support branch with adjusting branch, when specific works, adjusting
Branch can carry out squeeze adjustments to support branch, and support branch can drive support plate to be expanded outwardly, so that support plate
It can carry out inner support to the profile of different model to fix, adaptation effect is good, reduces because of the phenomenon that leading to low efficiency with roll change wheel.
Preferably, the rolling device includes connection frame and pressure roller, and the connection frame is mounted on casing internal, connection
The U-shaped structure in frame section, connection frame inside are uniformly equipped with pressure roller by pin shaft, and pressure roller can both convey profile, together
When compression can be supported to profile end face, preventing profile end face, deformation occurs.
Preferably, the adjusting branch includes rotating bar, sliding sleeve, adjustable plate and limit plate, inside the rotating turret
Rotating bar is installed by bearing, side of the setting there are two opposite screw thread, on each screw thread by being threadedly engaged in rotating bar
Formula is connected with sliding sleeve, and adjustable plate is symmetrically installed on sliding sleeve, and adjustable plate inner end is equipped with limit plate, and limit plate is by being slidably matched
Mode and rotating turret on limiting slot connection, when specific works, rotating bar rotation drives two sliding sleeves in the same direction or reversed turns
Dynamic, sliding sleeve is able to drive adjustable plate in turn and inwardly and outwardly moves, and limit plate plays the role of limiting adjustable plate.
Preferably, the support branch includes pressing plate, arc frame and connecting spring, is symmetrically set on the rotating turret
It is equipped with arc groove, is connected with arc frame inside arc groove by way of being slidably matched, arc frame inner end is equipped with pressing plate, arc
Frame upper end is connected with support plate, and connecting spring is provided between support plate and rotating turret, and when adjustable plate movement, adjustable plate is logical
Over-voltage strip move arc frame move out, arc frame drive support plate expand outwardly, and then realize to various sizes of profile into
The function of row processing, connecting spring play the role of reset.
Preferably, the adjustable plate is sector structure, is provided with the arcwall face tilted down on the outside of adjustable plate.
Preferably, the pressing plate lower end is provided with the inner concave with adjustable plate cooperation, is evenly arranged with rolling on inner concave
Pearl.
Preferably, the rotating bar left end is equipped with adjustment seat, and hexagonal screw hole is provided in adjustment seat.
(3) beneficial effect
1. profile provided by the invention rolls rear finishing process, apparatus for correcting can carry out finished machined to profile, simultaneously
Correct roller can carry out wilful adjusting according to the size of profile, and it is good to adapt to effect, and avoiding replacing different rollers leads to low efficiency
The phenomenon that occur, improve work efficiency, and pressure roller can carry out profiled ends, support compression, prevent profile occur shape
Become；
2. profile provided by the invention rolls rear finishing process, the design method for using roll-in to align can effectively disappear
Except the defect that web existing for profile is eccentric and the edge of a wing tilts, leveling effect is good, simple to operate, adds conducive to profile is subsequent
Work uses.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is process flow chart of the invention；
Fig. 2 is the planar structure schematic diagram between mounting rack of the present invention, casing, rolling device and apparatus for correcting；
Fig. 3 is the schematic diagram of the section structure between rotation axis of the present invention and correct roller；
Fig. 4 is the I of body 3 of the present invention to enlarged structure schematic diagram.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
As shown in Figures 1 to 4, a kind of profile rolls rear finishing process, comprising the following steps:
S1, blank heating: manually the furnace charging table to heating furnace is sent to be internally heated steel blank；
S2, blank rolling: it is I-shaped structure that the blank after heating in step S1 is pricked unit to be rolled into section through roller
Profile；
S3, cooling down: the profile after step S2 rolling is placed on cold bed and carries out cooling down；
S4, removing surface: by artificial mode that profile iron filings remained on surface, iron scale etc. in step S3 is miscellaneous
Matter；
S5, roll-in aligning: the profile after clearing up in step S4 being put into inside rolling device 3 and is conveyed, apparatus for correcting 4
Straightening operation is carried out to profile；
S6, spray painting: spray painting antirust is carried out to the plate after aligning in step S5；
S7, drying: the profile after painting in step S6 is put into naturally dry in air；
S8, storage storage: the profile after drying in step S7 is subjected to storage storage；
Above-mentioned profile rolls flow chart of the rear finishing process in S1-S8 step need to be by mounting rack 1, casing 2, rolling device
3 and the cooperation of apparatus for correcting 4 complete corresponding processing operation.
1 upper end of mounting rack is equipped with casing 2,2 rectangular in cross-section structure of casing, and 2 internal symmetry of casing is provided with
Rolling device 3, rolling device 3 is separately mounted to 2 inside of casing, and two sides, 2 internal symmetry of casing are provided with apparatus for correcting 4 up and down,
Apparatus for correcting 4 is separately mounted to the 2 inside left and right sides of casing.
The rolling device 3 includes connection frame 31 and pressure roller 32, and the connection frame 31 is mounted on inside casing 2, even
Connect the U-shaped structure in 31 section of frame, pressure roller 32 be uniformly equipped with by pin shaft inside connection frame 31, pressure roller 32 both can to profile into
Row conveying, while compression can be supported to profile end face, preventing profile end face, deformation occurs.
The apparatus for correcting 4 includes driving motor 41, rotation axis 42 and correct roller 43, is arranged inside the casing 2
There is correct roller 43, correct roller 43 is connected by 42 casing 2 of rotation axis, is symmetrically installed with driving electricity by motor cabinet on mounting rack 1
Machine 41, the output shaft of driving motor 41 are connect by shaft coupling with rotation axis 42, and when specific works, driving motor 41 passes through rotation
The profile for phenomena such as axis 42 drives correct roller 43 to be rotated, and correct roller 43 can tilt the web bias of appearance and the edge of a wing
Carry out aligning processing.
The correct roller 43 includes rotating turret 431, adjusts branch 432, support branch 433 and support plate 434, described
Rotating turret 431 is circular configuration, and rotating turret 431 is internally provided with cavity, and cavity inside, which is equipped with, adjusts branch 432, rotating turret
431 outsides are symmetrically arranged with support plate 434, and support plate 434 is cirque structure, and support plate 434 is by way of being slidably matched
It is connect with rotation axis 42, support branch 433 is symmetrically installed on rotating turret 431,433 outside of support branch and support plate 434 are solid
Fixed connection, 433 inside of support branch are close to branch 432 is adjusted, and when specific works, adjusting branch 432 can be to supporting branch
433 carry out squeeze adjustments, and support branch 433 can drive support plate 434 to be expanded outwardly, allow support plate 434 right
The profile of different model carries out inner support and fixes, and adaptation effect is good, reduces because of the phenomenon that leading to low efficiency with roll change wheel.
The adjusting branch 432 includes rotating bar 4321, sliding sleeve 4322, adjustable plate 4323 and limit plate 4324, described
Rotating turret 431 inside rotating bar 4321 is equipped with by bearing, there are two opposite screw threads for setting in rotating bar 4321, each
Sliding sleeve 4322 is connected on screw thread by way of being threadedly engaged, adjustable plate 4323, adjustable plate are symmetrically installed on sliding sleeve 4322
4323 inner ends are equipped with limit plate 4324, and limit plate 4324 is connected by way of being slidably matched with the limiting slot on rotating turret 431
It connects, 4322 left end of rotating bar is equipped with adjustment seat 4325, and hexagonal screw hole, specific works are provided in adjustment seat 4325
When, adjustment seat 4325 is rotated by artificial mode, adjustment seat 4325 drives two sliding sleeves 4322 by the rotation of rotating bar 4321
It in the same direction or rotates backward, sliding sleeve 4322 is able to drive adjustable plate 4323 in turn and inwardly and outwardly moves, and limit plate 4324 rises
To the effect limited to adjustable plate 4323.
The support branch 433 includes pressing plate 4331, arc frame 4332 and connecting spring 4333, the rotating turret
It is symmetrically arranged with arc groove on 431, is connected with arc frame 4332, arc frame 4332 inside arc groove by way of being slidably matched
Inner end is equipped with pressing plate 4331, and 4332 upper end of arc frame is connected with support plate 434, sets between support plate 434 and rotating turret 431
It is equipped with connecting spring 4333, the adjustable plate 4323 is sector structure, is provided with the arc tilted down on the outside of adjustable plate 4323
Shape face, 4331 lower end of pressing plate are provided with the inner concave cooperated with adjustable plate 4323, are evenly arranged with ball on inner concave,
When adjustable plate 4323 moves, adjustable plate 4323 drives arc frame 4332 to move out by pressing plate 4331,4332 band of arc frame
Dynamic support plate 434 expands outwardly, and then realizes the function of being processed to various sizes of profile, and connecting spring 4333 plays multiple
The effect of position.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of profile rolls rear finishing process, it is characterised in that: a kind of profile rolls rear finishing process, including following step
It is rapid:
S1, blank heating: manually the furnace charging table to heating furnace is sent to be internally heated steel blank；
S2, blank rolling: the blank after heating in step S1 is pricked into unit through roller and is rolled into the type that section is I-shaped structure
Material；
S3, cooling down: the profile after step S2 rolling is placed on cold bed and carries out cooling down；
S4, removing surface: by artificial mode by the impurity such as profile iron filings remained on surface, iron scale in step S3；
S5, roll-in aligning: the profile after clearing up in step S4 being put into inside rolling device (3) and is conveyed, apparatus for correcting (4)
Straightening operation is carried out to profile；
S6, spray painting: spray painting antirust is carried out to the plate after aligning in step S5；
S7, drying: the profile after painting in step S6 is put into naturally dry in air；
S8, storage storage: the profile after drying in step S7 is subjected to storage storage；
Above-mentioned profile rolls flow chart of the rear finishing process in S1-S8 step need to be by mounting rack (1), casing (2), rolling device
(3) and corresponding processing operation is completed in apparatus for correcting (4) cooperation, in which:
Described mounting rack (1) upper end is equipped with casing (2), and casing (2) rectangular in cross-section structure, casing (2) internal symmetry is set
It is equipped with rolling device (3), rolling device (3) is separately mounted to the internal two sides up and down of casing (2), the setting of casing (2) internal symmetry
Have apparatus for correcting (4), apparatus for correcting (4) is separately mounted to the internal left and right sides of casing (2)；
The apparatus for correcting (4) includes driving motor (41), rotation axis (42) and correct roller (43), and the casing (2) is interior
Portion is provided with correct roller (43), and correct roller (43) is connected by rotation axis (42) casing (2), and mounting rack passes through motor cabinet on (1)
It is symmetrically installed with driving motor (41), the output shaft of driving motor (41) is connect by shaft coupling with rotation axis (42)；
The correct roller (43) includes rotating turret (431), adjusts branch (432), support branch (433) and support plate (434),
The rotating turret (431) is circular configuration, and rotating turret (431) is internally provided with cavity, and cavity inside is equipped with adjusting branch
(432), it is symmetrically arranged with support plate (434) on the outside of rotating turret (431), support plate (434) is cirque structure, support plate
(434) it is connect by way of being slidably matched with rotation axis (42), support branch (433) is symmetrically installed on rotating turret (431),
It is fixedly connected on the outside of support branch (433) with support plate (434), is close on the inside of support branch (433) with adjusting branch (432).
2. a kind of profile according to claim 1 rolls rear finishing process, it is characterised in that: rolling device (3) packet
Connection frame (31) and pressure roller (32) are included, the connection frame (31) is mounted on casing (2) inside, and connection frame (31) section is U-shaped
Structure, connection frame (31) is internal to be uniformly equipped with pressure roller (32) by pin shaft.
3. a kind of profile according to claim 1 rolls rear finishing process, it is characterised in that: the adjusting branch (432)
Including rotating bar (4321), sliding sleeve (4322), adjustable plate (4323) and limit plate (4324), the rotating turret (431) is internal
It is equipped with rotating bar (4321) by bearing, opposite screw thread there are two settings in rotating bar (4321), is passed through on each screw thread
The mode being threadedly engaged is connected with sliding sleeve (4322), and adjustable plate (4323), adjustable plate are symmetrically installed on sliding sleeve (4322)
(4323) inner end is equipped with limit plate (4324), and limit plate (4324) is by way of being slidably matched and on rotating turret (431)
Limiting slot connection.
4. a kind of profile according to claim 1 rolls rear finishing process, it is characterised in that: the support branch (433)
Including pressing plate (4331), arc frame (4332) and connecting spring (4333), the rotating turret is symmetrically arranged with arc on (431)
Shape slot is connected with arc frame (4332) inside arc groove by way of being slidably matched, and arc frame (4332) inner end is equipped with pressure
Plate (4331), arc frame (4332) upper end are connected with support plate (434), are arranged between support plate (434) and rotating turret (431)
There are connecting spring (4333).
5. a kind of profile according to claim 4 rolls rear finishing process, it is characterised in that: the adjustable plate (4323) is
Sector structure, adjustable plate (4323) outside are provided with the arcwall face tilted down.
6. a kind of profile according to claim 4 rolls rear finishing process, it is characterised in that: described pressing plate (4331) lower end
It is provided with the inner concave with adjustable plate (4323) cooperation, is evenly arranged with ball on inner concave.
7. a kind of profile according to claim 3 rolls rear finishing process, it is characterised in that: the rotating bar (4322) is left
End is equipped with adjustment seat (4325), is provided with hexagonal screw hole in adjustment seat (4325).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910761109.XA CN110449462B (en) | 2019-08-17 | 2019-08-17 | Finishing process for rolled section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910761109.XA CN110449462B (en) | 2019-08-17 | 2019-08-17 | Finishing process for rolled section |
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| Publication Number | Publication Date |
|---|---|
| CN110449462A true CN110449462A (en) | 2019-11-15 |
| CN110449462B CN110449462B (en) | 2020-10-09 |
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ID=68487374
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910761109.XA Active CN110449462B (en) | 2019-08-17 | 2019-08-17 | Finishing process for rolled section |
Country Status (1)
| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111495979A (en) * | 2020-04-27 | 2020-08-07 | 陈益芬 | Automatic rolling mill for metal plate forming |
| CN111495978A (en) * | 2020-04-27 | 2020-08-07 | 陈益芬 | Metal plate forming rolling process |
| CN115338753A (en) * | 2022-07-19 | 2022-11-15 | 江苏福旺重工科技有限公司 | Surface rust removal equipment based on special-shaped steel structure |
| CN115338753B (en) * | 2022-07-19 | 2024-06-04 | 江苏福旺重工科技有限公司 | Surface rust cleaning equipment based on deformed steel structure |
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| CN105065469A (en) * | 2015-08-12 | 2015-11-18 | 中国舰船研究设计中心 | Device base with adjustable rigidity and adjustable height |
| CN205877097U (en) * | 2016-06-25 | 2017-01-11 | 湛江市恒润机械有限公司 | Granulation machine middle bearing support guiding mechanism |
| CN206779272U (en) * | 2017-01-17 | 2017-12-22 | 天津开发区精锐精密模具有限公司 | A kind of 90 degree of one step bending and the metal stamping die of adjustable-angle |
| CN109759483A (en) * | 2019-03-14 | 2019-05-17 | 肖成美 | A kind of I-steel correcting device |
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| DE4232407C2 (en) * | 1992-09-26 | 1994-10-13 | Hoestemberghe & Kluetsch Gmbh | Device for straightening hot-rolled beams or U-profiles |
| EP0634235A1 (en) * | 1993-07-14 | 1995-01-18 | Sms Schloemann-Siemag Aktiengesellschaft | Straightening machine for rolled profiles, especially H-profiles |
| JPH08112618A (en) * | 1994-10-12 | 1996-05-07 | Sumitomo Metal Ind Ltd | Shape straightener |
| JPH0985344A (en) * | 1995-09-26 | 1997-03-31 | Sumitomo Metal Ind Ltd | Variable roll equipment for wide flange beam |
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| CN204309038U (en) * | 2014-11-30 | 2015-05-06 | 重庆欣泰发食品有限公司 | Biscuit shaping cutting device |
| CN105065469A (en) * | 2015-08-12 | 2015-11-18 | 中国舰船研究设计中心 | Device base with adjustable rigidity and adjustable height |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111495979A (en) * | 2020-04-27 | 2020-08-07 | 陈益芬 | Automatic rolling mill for metal plate forming |
| CN111495978A (en) * | 2020-04-27 | 2020-08-07 | 陈益芬 | Metal plate forming rolling process |
| CN115338753A (en) * | 2022-07-19 | 2022-11-15 | 江苏福旺重工科技有限公司 | Surface rust removal equipment based on special-shaped steel structure |
| CN115338753B (en) * | 2022-07-19 | 2024-06-04 | 江苏福旺重工科技有限公司 | Surface rust cleaning equipment based on deformed steel structure |
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| Publication number | Publication date |
|---|---|
| CN110449462B (en) | 2020-10-09 |
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