CN115178603A - Metal plate strip roller type straightening machine and straightening method - Google Patents
Metal plate strip roller type straightening machine and straightening method Download PDFInfo
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- CN115178603A CN115178603A CN202210805392.3A CN202210805392A CN115178603A CN 115178603 A CN115178603 A CN 115178603A CN 202210805392 A CN202210805392 A CN 202210805392A CN 115178603 A CN115178603 A CN 115178603A
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- roller
- straightening
- roll
- assembly
- movable rod
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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
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/04—Movable or exchangeable mountings for tools
-
- 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
- B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
本发明公开一种金属板带材辊式矫直机及矫直方法，包括：机架、矫直辊组件、夹送辊组件和换辊机构；机架包括上架体和下架体，上架体和下架体之间形成容纳腔；矫直辊组件位于容纳腔内，包括若干等距设置的上矫直辊和若干等距设置的下矫直辊，上矫直辊和下矫直辊交错设置；任一上矫直辊都能相对于上架体沿竖直方向上下运动；夹送辊组件设置在机架两端的入口处和出口处；换辊机构包括工作台和换辊组件，工作台上设置有两条垂直于上矫直辊的第一轨道，换辊组件匹配设置在第一轨道上并能沿着第一轨道移动；本发明所提供的一种金属板带材辊式矫直机及矫直方法，能够根据不同产品的需要调整上矫直辊的位置，适用性强，且通过换辊机构方便更换矫直辊。
The invention discloses a metal plate and strip roll type straightening machine and a straightening method, comprising: a frame, a straightening roller assembly, a pinch roller assembly and a roll changing mechanism; the frame includes an upper frame body and a lower frame body, and the upper frame body A accommodating cavity is formed between it and the lower frame body; the straightening roller assembly is located in the accommodating cavity, including several upper straightening rollers arranged at equal intervals and several lower straightening rollers arranged at equal intervals, and the upper straightening rollers and the lower straightening rollers are staggered Arrangement; any upper straightening roller can move up and down in the vertical direction relative to the upper frame body; the pinch roller assembly is arranged at the entrance and exit at both ends of the frame; the roller changing mechanism includes a worktable and a roller changing assembly, the worktable There are two first rails perpendicular to the upper straightening rollers, and the roller changing assembly is matched and arranged on the first rails and can move along the first rails; The machine and the straightening method can adjust the position of the upper straightening roller according to the needs of different products, with strong applicability, and it is convenient to replace the straightening roller through the roller changing mechanism.
Description
Technical Field
The invention relates to the technical field of metal plate strip straightening equipment, in particular to a metal plate strip roller type straightening machine and a straightening method.
Background
The roller type straightening machine is equipment for straightening and leveling metal plate strips, and generally enables the metal plate strips to reach qualified flatness through the matching of an upper straightening roller and a lower straightening roller. In actual production, the position of the upper straightening roller is required to be adjusted according to the thickness of different products, in the existing roller type straightening machine, the height of the upper straightening roller can be adjusted only at the same time, the position of the straightening roller at an inlet or an outlet can be adjusted only at the same time, and the straightening machine suitable for different products is required to be selected, so that the production efficiency is greatly reduced. The straightening technology is mainly used for the post-process of processing the metal plate and strip, the quality level of a product is determined to a great extent, in order to increase the thickness range of a straightening plate and strip of the straightening machine, the straightening machine can be adapted with different roller systems, and proper straightening rollers are adopted according to different products in actual production; or the straightening rollers need to be replaced due to abrasion, and the traditional method for replacing the straightening rollers manually has low efficiency and certain dangerousness.
Therefore, there is a need for further research and practice of the above-mentioned technical problems.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a metal plate and strip roller type straightening machine and a straightening method, which can adjust the position of an upper straightening roller according to the requirements of different products, have strong applicability and facilitate the replacement of the straightening roller through a roller changing mechanism.
(II) technical scheme
The technical scheme adopted by the invention for solving the problems is as follows:
a sheet metal strip roll leveler comprising:
the rack comprises an upper rack body and a lower rack body, and an accommodating cavity is formed between the upper rack body and the lower rack body;
the straightening roller assembly is positioned in the accommodating cavity and comprises a plurality of upper straightening rollers arranged at equal intervals and a plurality of lower straightening rollers arranged at equal intervals, and the upper straightening rollers and the lower straightening rollers are arranged in a staggered manner; any upper straightening roller can move up and down along the vertical direction relative to the upper frame body;
the pinch roll assemblies are arranged at inlets and outlets at two ends of the rack and comprise upper pinch rolls and lower pinch rolls, a working gap exists between the upper pinch rolls and the lower pinch rolls, and the highest points of the lower pinch rolls are flush with the highest points of the lower straightening rolls;
the roll changing mechanism is arranged on one side of the rack and comprises a workbench and roll changing assemblies, two first rails perpendicular to the upper straightening rolls are arranged on the workbench, and the roll changing assemblies are arranged on the first rails in a matched mode and can move along the first rails; the roller changing assembly comprises two supporting legs, a cross beam, a roller clamping device and a roller supporting piece, wherein the two supporting legs are matched with the first rail respectively, the two ends of the cross beam are fixedly connected with the two supporting legs respectively, the cross beam is provided with a second rail perpendicular to the first rail, the roller clamping device is arranged on the second rail and can move along the second rail, and the roller supporting piece is fixedly arranged at the end part of one end of the rack, which is close to the second rail.
In the technical scheme, the upper straightening rollers are independent and do not interfere with each other, and can be suitable for metal plate strips with different thicknesses; after the straightening roll is clamped by the roll clamping device in the roll changing mechanism, the straightening roll is dragged to move along the second track to complete the replacement.
Furthermore, the roller clamping device is connected with a third driving mechanism, the third driving mechanism is used for controlling the roller clamping device to move along the second track, and a clamping portion matched with the end portion of the upper straightening roller is further arranged on the roller clamping device.
Among the above-mentioned technical scheme, drive the roll clamping device through third actuating mechanism and remove, the clamping part is used for with last leveling roller tip accordant connection.
Furthermore, a locking mechanism is arranged between the supporting leg and the first rail, the locking mechanism is electrically connected with a manual switch and an automatic trigger device, and the manual switch and the automatic trigger device are matched with each other to control the locking mechanism;
the automatic trigger device is arranged on the roller clamping device and comprises a first circuit board, a second circuit board, a sliding switch, a movable rod and an ejector pin matched with the movable rod, and an elastic part is arranged at the top of the movable rod; when the thimble does not push the movable rod by external force, the movable rod downwards extrudes the sliding switch under the action of the elastic piece, and the sliding switch is closed with the second circuit board; when the thimble is forced to move towards the direction close to the movable rod, and the movable rod moves upwards, the elastic piece is in a compressed state, and the sliding switch resets, is disconnected with the second circuit board and is in contact with the first circuit board.
In the technical scheme, the manual switch is in a first state, when the sliding switch is in contact with the second circuit board, the circuit is in a disconnected state, the cross beam can move on the first track through the supporting legs, when the clamping roller device is connected with the end part of the straightening roller in a matching mode, the ejector pins are extruded by the straightening roller to move towards the direction close to the movable rod, the movable rod moves upwards under the action of the ejector pins, the elastic piece is in a compressed state, the sliding switch is reset to be in contact with the first circuit board, the circuit is closed, the supporting legs are locked by the locking mechanism, and at the moment, if the manual switch is switched to a second state, the circuit is disconnected; when the roller clamping device is not connected with the end part of the straightening roller, the movable rod is subjected to the reaction force of the elastic piece to downwards extrude the sliding switch, and the sliding switch is separated from the first circuit board and is contacted with the second circuit board. The manual switch and the automatic trigger device are matched with each other to control the locking mechanism, so that the safety in the roll changing process is improved, and the straightening roll is convenient to detach and install.
Further, a sliding part is arranged above the roller supporting piece, and the sliding part comprises a supporting frame and a rolling piece arranged on the supporting frame.
Among the above-mentioned technical scheme, bearing roller spare is used for playing the supporting role to the straightening roller when the roll change, and when the pinch roll device drags the straightening roller and remove, the straightening roller slides for bearing roller spare, reduces the friction, avoids causing the damage to the surface of straightening roller.
Further, still include the leveling roller drive assembly, leveling roller drive assembly includes inverter motor, speed reducer, gear distributor box and universal joint, and inverter motor, speed reducer and gear distributor box connect gradually, the gear distributor box with go up through between leveling roller and the lower leveling roller universal joint links to each other.
Further, the output of gear distributor box with universal joint's one end is the key-type connection, universal joint's the other end with go up the leveling roller and be provided with freewheel clutch down between the leveling roller respectively, universal joint with adopt bolted connection and key-type connection between the freewheel clutch, freewheel clutch keeps away from universal joint's one end respectively with go up the leveling roller with down the leveling roller adopts the key-type connection.
The invention also provides a method for straightening the metal plate strip, which comprises the following steps:
s1, providing the metal plate strip roller type straightening machine in the previous technical scheme, and determining the initial position of each upper straightening roller;
s2, moving the upper straightening roll to a proper height according to the thickness of the metal plate strip to adjust the distance between the upper straightening roll and the lower straightening roll;
s3, starting the straightening roll transmission assembly and the pinch roll transmission assembly to enable the upper straightening roll and the lower straightening roll to keep synchronous operation and the upper pinch roll and the lower pinch roll to keep synchronous operation;
and S4, the metal plate strip sequentially passes through the inlet pinch roll, the straightening roll and the outlet pinch roll, and the straightening is finished.
(III) advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. according to the metal plate strip roller type straightening machine and the straightening method provided by the invention, the upper straightening rollers are independent and do not interfere with each other, and the metal plate strip roller type straightening machine can be suitable for metal plate strips with different thicknesses;
2. according to the metal plate strip roller type straightening machine and the straightening method provided by the invention, the straightening rollers are clamped by the roller clamping devices in the roller changing mechanism and are dragged to move along the second track to finish the replacement; when the clamping roller device drags the straightening roller to move, the straightening roller slides relative to the carrier roller piece, so that friction is reduced, and the surface of the straightening roller is prevented from being damaged.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 isbase:Sub>A schematic view of the structure of FIG. 1 in the direction A-A;
FIG. 3 is a schematic mechanical diagram of a roll changing mechanism according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of an automatic triggering device according to an embodiment of the present invention.
Wherein: the device comprises a frame 1, an upper frame 101, a lower frame 102, a straightening roller assembly 2, an upper straightening roller 201, a lower straightening roller 202, a pinch roller assembly 3, an upper pinch roller 301, a lower pinch roller 302, a roller changing mechanism 4, a workbench 401, a roller changing assembly 402, a first rail 403, a second rail 404, a supporting leg 405, a cross beam 406, a pinch roller device 407, a roller supporting member 408, a driving mechanism 409, a clamping part 410, a first circuit board 411, a second circuit board 412, a sliding switch 413, a movable rod 414, an ejector pin 415, an elastic part 416, a sliding part 417, a supporting frame 418, a rolling member 419, a straightening roller transmission assembly 5, a variable frequency motor 501, a speed reducer 502, a gear distribution box 503, a universal coupling 504 and an overrunning clutch 505.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Examples
As shown in fig. 1 to 4, the present invention provides a sheet metal strip roll leveler including:
the rack comprises a rack 1, wherein the rack 1 comprises an upper rack body 101 and a lower rack body 102, and an accommodating cavity is formed between the upper rack body 101 and the lower rack body 102;
the straightening roller assembly 2 is positioned in the accommodating cavity and comprises a plurality of upper straightening rollers 201 arranged at equal intervals and a plurality of lower straightening rollers 202 arranged at equal intervals, and the upper straightening rollers 201 and the lower straightening rollers 202 are arranged in a staggered manner; any one of the upper straightening rollers 201 can move up and down in the vertical direction relative to the upper frame body 101;
the pinch roll assembly 3 is arranged at an inlet and an outlet at two ends of the rack 1, and comprises an upper pinch roll 301 and a lower pinch roll 302, a working gap exists between the upper pinch roll 301 and the lower pinch roll 302, and the highest point of the lower pinch roll 302 is flush with the highest point of the lower straightening roll 202;
the roll changing mechanism 4 is arranged on one side of the rack 1 and comprises a workbench 401 and a roll changing assembly 402, two first rails 403 perpendicular to the upper straightening rolls 201 are arranged on the workbench 401, and the roll changing assembly 402 is arranged on the first rails 403 in a matching manner and can move along the first rails 403; the roller changing assembly 402 comprises two supporting legs 405, a cross beam 406, a roller clamping device 407 and a roller supporting member 408 which are respectively matched with the two first rails 403, two ends of the cross beam 406 are respectively and fixedly connected with the two supporting legs 405, a second rail 404 which is perpendicular to the first rails 403 is arranged on the cross beam 406, the roller clamping device 407 is arranged on the second rail 404 and can move along the second rail 404, and the roller supporting member 408 is fixedly arranged at the end part of the second rail 404 close to one end of the rack 1;
the straightening roll transmission assembly 5 comprises a variable frequency motor 501, a speed reducer 502, a gear distribution box 503 and a universal coupling 504, wherein the variable frequency motor 501, the speed reducer 502 and the gear distribution box 503 are sequentially connected, and the gear distribution box 503 is connected with the upper straightening roll 201 and the lower straightening roll 202 through the universal coupling 504;
the device comprises a pinch roll assembly 3, wherein the pinch roll assembly 3 comprises an upper pinch roll 301 and a lower pinch roll 302, a working gap exists between the upper pinch roll 301 and the lower pinch roll 302, and the highest point of the lower pinch roll 302 is flush with the highest point of the lower straightening roll 202.
The upper straightening rollers 201 are independent and do not interfere with each other, and can be suitable for metal plate strips with different thicknesses; after the straightening roller is clamped by the clamping roller device 407 in the roller changing mechanism 4, the straightening roller is dragged to move along the second rail 404 to complete the replacement.
The roller clamping device 407 is connected with a driving mechanism 409, the driving mechanism 409 is used for controlling the roller clamping device 407 to move along the second track 404, a clamping portion 410 matched with the end portion of the upper straightening roller 201 is further arranged on the roller clamping device 407, the driving mechanism 409 drives the roller clamping device 407 to move, and the clamping portion 410 is used for being matched and connected with the end portion of the upper straightening roller 201.
A locking mechanism is arranged between the supporting leg 405 and the first rail 403, the locking mechanism is electrically connected with a manual switch and an automatic trigger device, and the manual switch and the automatic trigger device are matched with each other to control the locking mechanism; the automatic trigger device is arranged on the roller clamping device 407, and comprises a first circuit board 411 and a second circuit board 412, a sliding switch 413, a movable rod 414, and a thimble 415 matched with the movable rod 414, wherein an elastic piece 416 is arranged at the top of the movable rod 414; when the thimble 415 does not push the movable rod 414 by an external force, the movable rod 414 presses the sliding switch 413 downwards under the action of the elastic element 416, and the sliding switch 413 and the second circuit board 412 are closed; when the thimble 415 is forced to move towards the direction close to the movable rod 414, and the movable rod 414 moves upwards, the elastic element 416 is in a compressed state, and the sliding switch 413 is reset to be disconnected from the second circuit board 412 and to be in contact with the first circuit board 411.
When the manual switch is in a first state, and the sliding switch 413 is in contact with the second circuit board 412, the circuit is in an open state, the cross beam 406 can move on the first track 403 through the supporting leg 405, when the roller clamping device 407 is in matched connection with the end of the straightening roller, the thimble 415 is extruded by the straightening roller to move towards the direction close to the movable rod 414, the movable rod 414 moves upwards under the action of the thimble 415, the elastic element 416 is in a compressed state, the sliding switch 413 is reset to be in contact with the first circuit board 411, the circuit is closed, the supporting leg 405 is locked by the locking mechanism, and at this time, if the manual switch is switched to a second state, the circuit is open; when the nip roller 407 is not connected to the end of the straightening roller, the movable rod 414 is pressed downward by the reaction force of the elastic member 416, and the slide switch 413 is separated from the first circuit board 411 and is in contact with the second circuit board 412. The manual switch and the automatic trigger device are matched with each other to control the locking mechanism, so that the safety in the roll changing process is improved, and the straightening roll is conveniently dismounted and mounted.
The roller supporting device is characterized in that a sliding portion 417 is arranged above the roller supporting piece 408, the sliding portion 417 comprises a supporting frame 418 and a rolling piece 419 arranged on the supporting frame 418, the roller supporting piece 408 is used for supporting the straightening roller when the roller is replaced, and when the roller clamping device 407 drags the straightening roller to move, the straightening roller slides relative to the roller supporting piece 408, so that friction is reduced, and the surface of the straightening roller is prevented from being damaged.
The output of gear distributor box 503 with universal joint 504's one end is the key-type connection, universal joint 504's the other end with go up straightening roller 201 and be provided with freewheel clutch 505 between the straightening roller 202 down respectively, universal joint 504 with adopt bolted connection and key-type connection between the freewheel clutch 505, freewheel clutch 505 keeps away from universal joint 504's one end respectively with go up straightening roller 201 with straightening roller 202 adopts the key-type connection down.
The invention also provides a method for straightening the metal plate strip, which comprises the following steps:
s1, providing the metal plate strip roller type straightener in the previous technical scheme, and determining the initial position of each upper straightening roller 201;
s2, moving the upper straightening roll 201 to a proper height according to the thickness of the metal plate strip to adjust the distance between the upper straightening roll 201 and the lower straightening roll 202;
s3, starting the straightening roll transmission assembly 5 and the pinch roll transmission assembly to enable the upper straightening roll 201 and the lower straightening roll 202 to keep synchronous operation and the upper pinch roll 301 and the lower pinch roll 302 to keep synchronous operation;
s4, the metal plate strip sequentially passes through the inlet pinch roll, the straightening roll and the outlet pinch roll, and the straightening is completed.
According to the metal plate strip roller type straightening machine and the straightening method provided by the invention, the upper straightening rollers are independent and do not interfere with each other, and the metal plate strip roller type straightening machine can be suitable for metal plate strips with different thicknesses; after the straightening roller is clamped by a roller clamping device in the roller changing mechanism, the straightening roller is dragged to move along a second track to finish the replacement; when the clamping roller device drags the straightening roller to move, the straightening roller slides relative to the carrier roller piece, so that friction is reduced, and the surface of the straightening roller is prevented from being damaged.
In summary, the above embodiments are not intended to be limiting embodiments of the present invention, and modifications and equivalent variations made by those skilled in the art based on the spirit of the present invention are within the technical scope of the present invention.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210805392.3A CN115178603A (en) | 2022-07-08 | 2022-07-08 | Metal plate strip roller type straightening machine and straightening method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210805392.3A CN115178603A (en) | 2022-07-08 | 2022-07-08 | Metal plate strip roller type straightening machine and straightening method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115178603A true CN115178603A (en) | 2022-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210805392.3A Pending CN115178603A (en) | 2022-07-08 | 2022-07-08 | Metal plate strip roller type straightening machine and straightening method |
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| CN (1) | CN115178603A (en) |
Citations (11)
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|---|---|---|---|---|
| JPH0715101U (en) * | 1993-08-10 | 1995-03-14 | 住友金属工業株式会社 | Roll changer for multiple rolling mill |
| CN2813152Y (en) * | 2005-08-25 | 2006-09-06 | 郑明福 | Safety protection controlling device for punching machine |
| CN201079801Y (en) * | 2007-09-30 | 2008-07-02 | 济南重工股份有限公司 | Roller replacing device for straightening machine |
| WO2008145355A1 (en) * | 2007-05-30 | 2008-12-04 | Arku Maschinenbau Gmbh | Straightening machine having a straightening roller rapid-change system, and a method for rapidly changing straightening rollers of a straightening machine |
| CN201735591U (en) * | 2010-07-01 | 2011-02-09 | 上海西重所重型机械成套有限公司 | A quick clamping and changing roller device |
| CN102335682A (en) * | 2010-07-28 | 2012-02-01 | 宝山钢铁股份有限公司 | Online detecting and straightening equipment and method of straightness of pipe end of drill pipe |
| CN202539195U (en) * | 2012-03-23 | 2012-11-21 | 高宇笙 | Automatic roll changing and adjusting device of mill |
| CN107199291A (en) * | 2017-07-26 | 2017-09-26 | 福州大学 | Spring top guide transmits bad detection mechanism and its application method |
| CN208743365U (en) * | 2018-09-29 | 2019-04-16 | 威海海鑫新材料有限公司 | An aluminum alloy cold rolling mill work roll changing trolley |
| CN209476926U (en) * | 2019-02-01 | 2019-10-11 | 力同铝业（河南）有限公司 | Working roll Quick roll-changing device |
| CN111558632A (en) * | 2020-04-22 | 2020-08-21 | 中国重型机械研究院股份公司 | Novel roller type straightening machine and straightening method |
-
2022
- 2022-07-08 CN CN202210805392.3A patent/CN115178603A/en active Pending
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|---|---|---|---|---|
| JPH0715101U (en) * | 1993-08-10 | 1995-03-14 | 住友金属工業株式会社 | Roll changer for multiple rolling mill |
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| WO2008145355A1 (en) * | 2007-05-30 | 2008-12-04 | Arku Maschinenbau Gmbh | Straightening machine having a straightening roller rapid-change system, and a method for rapidly changing straightening rollers of a straightening machine |
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| CN201735591U (en) * | 2010-07-01 | 2011-02-09 | 上海西重所重型机械成套有限公司 | A quick clamping and changing roller device |
| CN102335682A (en) * | 2010-07-28 | 2012-02-01 | 宝山钢铁股份有限公司 | Online detecting and straightening equipment and method of straightness of pipe end of drill pipe |
| CN202539195U (en) * | 2012-03-23 | 2012-11-21 | 高宇笙 | Automatic roll changing and adjusting device of mill |
| CN107199291A (en) * | 2017-07-26 | 2017-09-26 | 福州大学 | Spring top guide transmits bad detection mechanism and its application method |
| CN208743365U (en) * | 2018-09-29 | 2019-04-16 | 威海海鑫新材料有限公司 | An aluminum alloy cold rolling mill work roll changing trolley |
| CN209476926U (en) * | 2019-02-01 | 2019-10-11 | 力同铝业（河南）有限公司 | Working roll Quick roll-changing device |
| CN111558632A (en) * | 2020-04-22 | 2020-08-21 | 中国重型机械研究院股份公司 | Novel roller type straightening machine and straightening method |
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Application publication date: 20221014 |