CN113680826A - Maintenance method for vertical roll box of vertical rolling mill - Google Patents
Maintenance method for vertical roll box of vertical rolling mill Download PDFInfo
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- CN113680826A CN113680826A CN202110820179.5A CN202110820179A CN113680826A CN 113680826 A CN113680826 A CN 113680826A CN 202110820179 A CN202110820179 A CN 202110820179A CN 113680826 A CN113680826 A CN 113680826A
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- intermediate shaft
- box body
- bearing
- gear sleeve
- outer gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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Abstract
A maintenance method for a vertical roll box of a vertical rolling mill belongs to the technical field of maintenance methods for vertical rolling mills, and is used for quickly assembling a medium shaft of the vertical roll box. The technical scheme is as follows: measuring the thickness of a bearing at the bottom end of the first intermediate shaft box body to be a, then annularly processing teeth larger than the width of a in the lower end direction of the second intermediate shaft gear sleeve box body, hoisting the first intermediate shaft with all the bearing inner sleeves arranged at two sides during assembly, aligning the gap position of the second intermediate shaft gear sleeve, and arranging the first intermediate shaft into a lower bearing position, so that the installation of the first intermediate shaft with the bearing is realized; and cutting a square hole at the position which is right in front of the second intermediate shaft gear sleeve of the box body and is inclined to the lower part, and installing a flange and a blind cover on the square hole. The invention is the first creation of the maintenance method of the vertical roll box of the vertical roll mill, breaks through the traditional maintenance mode, is hard to imagine in the conventional assembly method, thoroughly solves the problem that the box body of the vertical roll box must be overturned for many times in the existing assembly method, greatly shortens the whole disassembly and inspection period, has simple and reliable operation process and greatly improves the safety.
Description
Technical Field
The invention relates to a method for overhauling a vertical roll box of a vertical rolling mill, belonging to the technical field of overhauling methods of vertical rolling mills.
Background
The vertical roll box of the vertical rolling mill is a mill transmission device for controlling the width of a plate on a rolling line, and the device uses a long universal joint shaft for power supply and bears relatively large rolling force, so that the use environment is relatively severe. Meanwhile, in the use process, due to the reasons of difficult sealing of the box body of the vertical roller box, poor lubrication of equipment and the like, the parts in the vertical roller box are greatly abraded, the damage frequency is high, and the maintenance is frequent.
The maintenance process of the vertical roller box comprises the steps of firstly disassembling all parts in the box body, replacing new spare parts according to the abrasion condition, and then assembling. At present, in the assembling process, because both positions of a first intermediate shaft and a second intermediate shaft in a box body are tight, the assembling relation exists between the first intermediate shaft and the second intermediate shaft and is shielded, the lower part of the first intermediate shaft cannot be provided with a bearing for installation, the bearing can only be installed by turning over the box body after the optical shaft is installed, the assembling can be completed by turning over the vertical roller box body for many times in the dismantling and assembling process, and meanwhile, the box body of the vertical roller box is of a fully-closed structure and is not beneficial to observation and maintenance. Therefore, according to the existing maintenance method, the assembly time is greatly prolonged, the personnel and labor intensity are increased, and due to the fact that the box body of the vertical roller box is large in size, the total weight is 10 tons, and the bottom of the box body is provided with an arc, the hoisting is difficult, and certain potential safety hazards exist.
In conclusion, the maintenance of the vertical roll box of the vertical roll mill is an important work for ensuring the normal operation of the vertical roll mill, the existing maintenance method cannot meet the production requirement, and becomes a difficult problem for restricting the maintenance of the vertical roll box, and a new maintenance method is urgently needed to be adopted for maintaining the vertical roll box so as to ensure the normal operation of the production.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for overhauling a vertical roll box of a vertical rolling mill, which can conveniently hoist a second intermediate shaft, simultaneously can install a first intermediate shaft with a bearing, reduce the overturning times of a box body, simplify the assembly procedure, ensure the installation quality and efficiency and improve the safety.
The technical scheme for solving the technical problems is as follows:
a method for overhauling a vertical roll box of a vertical rolling mill comprises the following steps:
firstly, dismantling components in a box body;
secondly, cleaning the interior of the box body, measuring the relative position of a second intermediate shaft outer gear sleeve and a box body shell in the box body, and measuring the thickness of a bearing below the first intermediate shaft;
thirdly, calculating the number and the length of gear teeth of a second intermediate shaft outer gear sleeve to be cut according to a measurement result, measuring the thickness of a first intermediate shaft lower bearing at the bottom of the box body to be a, and processing teeth larger than the width a in an annular mode in the direction of the lower end of the second intermediate shaft outer gear sleeve box body, or processing 3 teeth at the position, opposite to the first intermediate shaft lower bearing, of the second intermediate shaft outer gear sleeve, wherein the processing length is larger than the length a, and the width of the first intermediate shaft lower part with the bearing entering a bearing position is reserved;
fourthly, cutting the outer shell of the box body by using a cutting tool, cutting a 200 mm-200 mm square hole in the lower part of the right front part of the outer gear sleeve of the second intermediate shaft of the box body, welding a flange with a corresponding size on the cut square hole after the hole is formed, uniformly distributing screw holes on the flange, manufacturing a blind cover corresponding to the flange, padding an anti-leakage rubber between the flange and the blind cover, and screwing the blind cover and the flange tightly by using bolts for sealing;
fifthly, the second intermediate shaft outer gear sleeve is placed in the box body, then the cut square hole is lifted to a proper height and position in the box body, the second intermediate shaft is inserted from the outer side of the bottom of the box body to support the second intermediate shaft outer gear sleeve, an end cover is assembled, then the notch of the second intermediate shaft outer gear sleeve after cutting teeth is rotated to a position opposite to the first intermediate shaft, meanwhile, the outer sleeve of the lower bearing of the first intermediate shaft is arranged in the bearing position at the lower part of the box body, and then the lower end cover of the box body at the bottom of the box body is tightly sealed and is ensured to be tightly contacted with the outer sleeve of the lower bearing of the first intermediate shaft;
sixthly, the hollow shaft with the assembled bearing is knocked into the box body from the large end, namely the upper part of the box body, and the lower end cover is sealed, and all end covers at the lower part of the box body are assembled;
hoisting the first intermediate shaft with the bearing inner sleeves on two sides completely installed, aligning the gap position of the second intermediate shaft outer gear sleeve, installing the first intermediate shaft lower bearing position, and meshing the shaft teeth of the first intermediate shaft with the second intermediate shaft outer gear sleeve;
eighthly, hoisting the fast shaft and placing the fast shaft into a bearing position;
and step nine, screwing the box body bolts on the box body cover, adjusting and assembling the shaft end covers and adjusting the gaps of the bearings on the upper part. And finally, assembling the fast shaft coupler.
In the first step, firstly, vertically placing the vertical roll box to be disassembled and inspected into a support frame, taking down a coupler of a fast shaft of a box body, and disassembling bolts of an upper cover of the box body; then, sequentially lifting an upper end cover of the box body, the fast shaft and the first intermediate shaft out, removing the oil pipe and removing the upper end cover of the hollow shaft; then the box body is lifted out of the supporting frame and laid down, and all end covers at the bottom of the box body are completely removed; then, the hollow shaft is knocked out from the small end to the large end by using a large columnar object, and the bearing is not knocked; and finally, removing the oil pipe at the top of the second intermediate shaft, withdrawing the second intermediate shaft from one side of the bottom of the box body, and taking out the outer gear sleeve of the second intermediate shaft.
According to the method for overhauling the vertical roll box of the vertical rolling mill, in the fourth step, the welding height of the flange on the cutting square hole is based on the condition that the height of the bolt cap does not protrude out of the side fixing processing surface of the box body after the blind cover is assembled, so that the influence on the online use and replacement of the box body is avoided.
The invention has the beneficial effects that:
the thickness of the bearing at the bottom end of the first intermediate shaft box body is measured to be a, then teeth larger than the width of a are annularly machined in the direction of the lower end of the second intermediate shaft gear sleeve box body, or 3 teeth are machined in the position, opposite to the lower bearing of the first intermediate shaft, of the second intermediate shaft gear sleeve, the machined length is larger than the length of a, when the bearing box is assembled, the first intermediate shaft with the bearing inner sleeves on the two sides completely installed can be hoisted, the lower bearing position is installed in alignment with the notch position of the second intermediate shaft gear sleeve, the installation of the bearing with the first intermediate shaft is achieved, and the method that the bearing is installed by turning over the box body again after only the optical axis is installed is avoided. According to the invention, a square hole is cut at the position which is right in front of the second intermediate shaft gear sleeve and is inclined to the lower part, the flange and the blind cover are arranged on the square hole, the second intermediate shaft can be conveniently hoisted through the square hole, and simultaneously, the conditions of intermediate shaft bearings, teeth and other internal parts inside the box body can be conveniently checked.
The invention is the first creation of the maintenance method of the vertical roll box of the vertical roll mill, breaks through the traditional maintenance mode, adopts the method of cutting the outer gear sleeve of the second intermediate shaft gear to realize the assembly of the belt bearing of the first intermediate shaft, which is hard to imagine in the conventional assembly method, thoroughly solves the problem that the box body of the vertical roll box must be overturned for many times in the existing assembly method, has very visual and convenient maintenance and spot inspection, greatly shortens the whole disassembly and inspection period, has simple and reliable operation process and greatly improves the safety.
Drawings
FIG. 1 is a schematic view of the construction of a vertical roller box;
FIG. 2 is a schematic view of the position of the openings in the roll cage;
FIG. 3 is a schematic diagram of the results for the second countershaft sleeve.
The figures are labeled as follows: the fast shaft 1, the first intermediate shaft 2, the box upper end cover 3, the working roll 4, the hollow shaft 5, the second intermediate shaft 6, the second intermediate shaft outer gear sleeve 7, the first intermediate shaft lower bearing 8, the box lower end cover 9, the square hole 10 and the cut-off part 11 of the tooth part of the second intermediate shaft gear sleeve.
Detailed Description
The technical scheme of the invention is as follows: a hole is formed in the side of the box body of the vertical roller box, a flange is welded, a blind cover is installed for sealing, and the position of the hole is based on the principle that the condition of a bearing at the lower part of the first intermediate shaft can be seen and the second intermediate shaft gear sleeve is convenient to hoist; meanwhile, all teeth on the gear sleeve with a certain length (such as 70 mm) are cut off in an annular mode, or 3 teeth (to the root of the teeth) with a certain length (such as 70 mm) on the lower portion of the second intermediate shaft gear sleeve are machined, the part is aligned to the first intermediate shaft bearing during assembly, the first intermediate shaft with the bearing rolling element portion installed can be conveniently installed into the bearing position with the bearing outer ring installed, and the overturning frequency during box body assembly is reduced.
The technical scheme of the invention comprises the following specific steps:
(1) and vertically placing the vertical roller box to be disassembled and inspected into a special supporting frame, taking down a coupler of the box body fast shaft 1, and disassembling a bolt of an upper cover of the box body.
(2) And sequentially lifting the upper end cover 3 of the box body, the fast shaft 1 and the first intermediate shaft 2 out, and removing the oil pipe and the upper end cover of the hollow shaft 5.
(3) The box body is lifted out of the supporting frame and laid down, and all end covers at the bottom of the box body are completely removed.
(4) The hollow shaft 5 is knocked out from the small end to the large end by a large columnar object, the bearing is not knocked, the shaft top oil pipe of the second intermediate shaft 6 is disassembled, then the second intermediate shaft 6 is withdrawn from one side of the bottom of the box body, and the second intermediate shaft outer gear sleeve 7 is taken out.
(5) Cleaning the interior of the box body, and measuring the relative position of the second intermediate shaft outer gear sleeve 7 and the shell of the box body; the thickness of the lower bearing 8 of the first intermediate shaft is measured, the number and the length of gear teeth of the outer gear sleeve 7 of the second intermediate shaft are required to be cut through measurement and calculation, the thickness of the lower bearing 8 of the first intermediate shaft at the bottom end of the box body of the first intermediate shaft 2 is measured to be 60mm, teeth with the width of 70mm are annularly machined off in the lower end direction of the box body of the outer gear sleeve 7 of the second intermediate shaft, the width of the lower part of the first intermediate shaft 2 with the bearing entering a bearing position is reserved, or the machining length of 3 teeth is 70mm when the outer gear sleeve 7 of the second intermediate shaft is opposite to the lower bearing 8 of the first intermediate shaft, the lower part of the first intermediate shaft 2 can be provided with the bearing, and the overturning times during box body assembling are reduced.
(6) Cutting the box shell by using a cutting tool, cutting 200 mm-200 mm square holes 10 at the position which is just ahead and is under the second intermediate shaft outer gear sleeve 7 so as to be convenient for assembling the second intermediate shaft 6 and checking the bearings at the lower parts of the two intermediate shaft box bodies, welding a flange with a corresponding size on the cut square holes 10 after the holes are opened, uniformly distributing M16 threaded holes on the flange, making phi 18mm bolt holes at the positions corresponding to the flanges on the blind cover, preventing rubber leakage between the flange and the blind cover, and screwing down by using M16 bolts so as to seal the position.
The part is only opened during on-line inspection or box body disassembly inspection, the integrity of the intermediate shaft bearing, the teeth and other internal parts in the box body can be conveniently inspected by using the square hole 10, and meanwhile, two intermediate shafts are conveniently assembled. The flange welding height is subject to the condition that the height of the bolt cap does not protrude out of the processing surface for fixing the side of the box body after the blind cover is assembled, otherwise the online use and replacement of the box body are influenced.
(7) In the assembling process, the second intermediate shaft outer gear sleeve 7 is firstly placed into the box body and then is hoisted to the proper height and position in the box body through the square hole 10. Inserting a second intermediate shaft 6 from the outer side of the bottom of the box body to support a second intermediate shaft outer gear sleeve 7, wherein the gap between the second intermediate shaft 6 and the second intermediate shaft outer gear sleeve 7 is 0.3-0.5mm, and assembling an end cover; then, rotating the gap of the second intermediate shaft outer gear sleeve 7 after cutting teeth to a position opposite to the first intermediate shaft 2; meanwhile, the bearing 8 at the lower part of the first intermediate shaft is sleeved in the bearing position at the lower part of the box body, and then the lower end cover 9 of the box body at the bottom of the box body is sealed and closed and is ensured to be in close contact with the bearing sleeve, so that the final gap adjustment is facilitated.
(8) The hollow shaft 5 with the bearings assembled is pushed into the large end, i.e. the upper part of the box body, and the lower end cover is sealed, and all the end covers at the lower part of the box body are assembled.
(9) The box is erected and hoisted back to the support frame special for maintenance.
(10) And hoisting the first intermediate shaft 2 with the bearing inner sleeves on two sides completely installed, aligning the gap position of the second intermediate shaft outer gear sleeve 7, installing the first intermediate shaft 2 into the lower bearing position, and meshing the shaft teeth of the first intermediate shaft 2 with the second intermediate shaft outer gear sleeve 7.
(11) And hoisting the fast shaft 1 and placing the fast shaft into a bearing position.
(12) And screwing a box body bolt on the box body cover, adjusting and assembling each shaft end cover and adjusting the gap between each bearing on the upper part, and finally assembling the fast shaft coupler to finish the assembly.
Claims (3)
1. A method for overhauling a vertical roll box of a vertical rolling mill is characterized by comprising the following steps: the method comprises the following steps:
firstly, dismantling components in a box body;
secondly, cleaning the interior of the box body, measuring the relative position of a second intermediate shaft outer gear sleeve (7) and a box body shell in the box body, and measuring the thickness of a first intermediate shaft lower bearing (8);
thirdly, calculating the number and the length of gear teeth of a second intermediate shaft outer gear sleeve (7) to be cut according to a measurement result, measuring the thickness of a first intermediate shaft lower bearing (8) at the bottom of the box body to be a, and annularly processing teeth larger than the width of a in the lower end direction of the box body of the second intermediate shaft outer gear sleeve (7) or processing 3 teeth at the position, opposite to the first intermediate shaft lower bearing (8), of the second intermediate shaft outer gear sleeve (7), wherein the processing length is larger than the length of a, and the width of the lower part of the first intermediate shaft (2) with a bearing entering a bearing position is reserved;
fourthly, cutting the box body shell by using a cutting tool, cutting 200 mm-200 mm square holes (10) at the position which is just in front of the second intermediate shaft outer gear sleeve (7) and is inclined to the lower part, welding a flange with a corresponding size on the cut square holes (10) after the holes are formed, uniformly distributing screw holes on the flange, manufacturing a blind cover corresponding to the flange, padding an anti-leakage rubber between the flange and the blind cover, and screwing the blind cover and the flange tightly by using bolts for sealing;
fifthly, the second intermediate shaft outer gear sleeve (7) is placed into the box body and then lifted to a proper height and position in the box body through the cut square hole (10), the second intermediate shaft (6) is inserted from the outer side of the bottom of the box body to support the second intermediate shaft outer gear sleeve (7) and an end cover is assembled, then a gap of the second intermediate shaft outer gear sleeve (7) with cut teeth is rotated to a position opposite to the first intermediate shaft (2), meanwhile, the outer sleeve of the first intermediate shaft lower bearing (8) is installed in a bearing position at the lower part of the box body, and then the lower end cover (9) of the box body at the bottom of the box body is sealed and closed and is ensured to be in close contact with the outer sleeve of the first intermediate shaft lower bearing (8);
sixthly, the hollow shaft (5) with the assembled bearing is knocked into the box body from the large end, namely the upper part of the box body, and the lower end cover is sealed, and all end covers at the lower part of the box body are assembled;
seventhly, hoisting the first intermediate shaft (2) with the bearing inner sleeves on the two sides completely installed, aligning the gap position of the second intermediate shaft outer gear sleeve (7), installing the first intermediate shaft outer gear sleeve into the bearing position of the first intermediate shaft lower bearing (8), and meshing the shaft teeth of the first intermediate shaft (2) with the second intermediate shaft outer gear sleeve (7);
eighthly, hoisting the fast shaft (1) and placing the fast shaft into a bearing position;
step nine, screwing a box body bolt on a box body cover, adjusting and assembling shaft end covers and adjusting the gap between bearings on the upper part;
and finally, assembling the fast shaft coupler.
2. The edger box inspection method of claim 1, wherein: in the first step, firstly, a vertical roller box to be disassembled and inspected is vertically placed in a supporting frame, a coupler of a box body fast shaft (1) is taken down, and a bolt of an upper cover of the box body is removed; then, sequentially lifting an upper end cover (3), the fast shaft (1) and the first intermediate shaft (2) out, removing an oil pipe and removing an upper end cover of the hollow shaft (5); then the box body is lifted out of the supporting frame and laid down, and all end covers at the bottom of the box body are completely removed; then, the hollow shaft (5) is knocked out from the small end to the large end by using a large columnar object, and the bearing is not knocked; and finally, removing the shaft jacking oil pipe of the second intermediate shaft (6), withdrawing the second intermediate shaft (6) from one side of the bottom of the box body, and taking out the second intermediate shaft outer gear sleeve (7).
3. The edger box inspection method of claim 1, wherein: in the fourth step, the welding height of the flange on the cutting square hole (10) is based on the condition that the height of the bolt cap does not protrude out of the processing surface for fixing the side of the box body after the blind cover is assembled, so that the influence on the online use and replacement of the box body is avoided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110820179.5A CN113680826B (en) | 2021-07-20 | 2021-07-20 | Vertical roll box overhauling method of vertical roll mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110820179.5A CN113680826B (en) | 2021-07-20 | 2021-07-20 | Vertical roll box overhauling method of vertical roll mill |
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| Publication Number | Publication Date |
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| CN113680826A true CN113680826A (en) | 2021-11-23 |
| CN113680826B CN113680826B (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110820179.5A Active CN113680826B (en) | 2021-07-20 | 2021-07-20 | Vertical roll box overhauling method of vertical roll mill |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB674992A (en) * | 1949-09-28 | 1952-07-02 | Sven Erik Malte Norlindh | Improvements in universal rolling mills |
| CN101108395A (en) * | 2007-08-22 | 2008-01-23 | 天津市天发重型水电设备制造有限公司 | Rough rolling vertical roller mill |
| CN101391267A (en) * | 2008-11-04 | 2009-03-25 | 北京首钢建设集团有限公司 | On-line assembling entirety on-position assembling method of edge mill |
| CN102172616A (en) * | 2011-01-11 | 2011-09-07 | 中冶赛迪工程技术股份有限公司 | Novel upper-transmission vertical roller mill, mill arrangement mode and roller changing method |
| CN202290755U (en) * | 2011-09-21 | 2012-07-04 | 天津市中重科技工程有限公司 | Side pressing device and vertical roller box connecting structure of universal mill |
| CN204220622U (en) * | 2014-11-17 | 2015-03-25 | 中国第一重型机械股份公司 | Vertical roller mill system adds roller box structure |
| CN110038903A (en) * | 2018-01-17 | 2019-07-23 | 宝山钢铁股份有限公司 | A kind of rolling-mill housing roller drive arrangement |
| CN112935759A (en) * | 2021-02-02 | 2021-06-11 | 河钢股份有限公司承德分公司 | Method for assembling gear of finishing mill cone box |
-
2021
- 2021-07-20 CN CN202110820179.5A patent/CN113680826B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB674992A (en) * | 1949-09-28 | 1952-07-02 | Sven Erik Malte Norlindh | Improvements in universal rolling mills |
| CN101108395A (en) * | 2007-08-22 | 2008-01-23 | 天津市天发重型水电设备制造有限公司 | Rough rolling vertical roller mill |
| CN101391267A (en) * | 2008-11-04 | 2009-03-25 | 北京首钢建设集团有限公司 | On-line assembling entirety on-position assembling method of edge mill |
| CN102172616A (en) * | 2011-01-11 | 2011-09-07 | 中冶赛迪工程技术股份有限公司 | Novel upper-transmission vertical roller mill, mill arrangement mode and roller changing method |
| CN202290755U (en) * | 2011-09-21 | 2012-07-04 | 天津市中重科技工程有限公司 | Side pressing device and vertical roller box connecting structure of universal mill |
| CN204220622U (en) * | 2014-11-17 | 2015-03-25 | 中国第一重型机械股份公司 | Vertical roller mill system adds roller box structure |
| CN110038903A (en) * | 2018-01-17 | 2019-07-23 | 宝山钢铁股份有限公司 | A kind of rolling-mill housing roller drive arrangement |
| CN112935759A (en) * | 2021-02-02 | 2021-06-11 | 河钢股份有限公司承德分公司 | Method for assembling gear of finishing mill cone box |
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|---|---|
| CN113680826B (en) | 2023-07-25 |
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