CN217667555U - Profile steel rolling mill frame memorial archway restoration simulation piece - Google Patents
Profile steel rolling mill frame memorial archway restoration simulation piece Download PDFInfo
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- CN217667555U CN217667555U CN202221215421.2U CN202221215421U CN217667555U CN 217667555 U CN217667555 U CN 217667555U CN 202221215421 U CN202221215421 U CN 202221215421U CN 217667555 U CN217667555 U CN 217667555U
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Abstract
The utility model provides a be applied to section steel rolling mill frame memorial archway restoration simulation piece in section steel rolling mill technical field, section steel rolling mill frame memorial archway restore simulation piece's simulation piece subassembly I (1) including intermediate part (3), intermediate part (3) set up through-hole (4), simulation piece subassembly II (2) set up to be drum mesostructure, simulation piece subassembly II (2) inner wall sets up lower part annular portion (5) and upper portion annular portion (6), sets up step portion (7) between lower part annular portion (5) and upper portion annular portion (6). Shape steel rolling mill frame memorial archway restoration simulation piece, simple structure can conveniently reliably realize processing such as shape steel rolling mill frame memorial archway restoration simulation heating, welding, is convenient for carry out on-the-spot actual modification according to the data of restoreing the record in the simulation process, improves on-the-spot restoration accuracy, avoids direct on-the-spot restoration to cause the damage to the mounting hole to simulation piece low in manufacturing cost, manufacturing cycle is short.
Description
Technical Field
The utility model belongs to the technical field of the section steel rolling mill, more specifically say, relate to a section steel rolling mill frame memorial archway restoration simulation piece.
Background
The universal rolling mill is important production equipment for a section steel (such as H-shaped steel) production line, a housing of the universal rolling mill is pressed with mounting holes of copper nuts of a screw pair, and the universal rolling mill is positioned at the bottom of the rolling mill, so that heavy load work is carried out in severe environment for a long time, abrasion and corrosion lead to abrasion in different degrees in the aspects of diameter and depth, the size is unqualified, the copper nuts are crushed and deformed, and faults occur repeatedly to influence production. The main material increase part of the mounting hole is an upper stepped hole, the total weight of the single memorial archway is dozens of tons, and the single memorial archway is difficult to disassemble on site. Considering the strength and rigidity of the rolling mill, a reaming repairing method cannot be adopted, only on-site additive surfacing can be implemented, MT and PT penetration flaw detection is ensured to be free of cracks and gas Kong Quexian, and drawing size and precision are recovered by machining on a line. The repair scheme has the following difficulties: (1) The main body material of the housing (the main body material is a German brand GS20Mn5N, and N refers to a normal fire state). The weldability is better. Hot cracks are unlikely to occur, cold cracks are likely to occur, and post-weld heat treatment is required to relieve stress. Welding also has laminar tearing, which necessitates preheating and controlled welding heat input. Embrittlement of the heat-affected zone produces widmanstats leading to a decrease in toughness. After welding, the influence of thermal strain embrittlement is effectively eliminated by multiplying the welding time by 550-600 ℃ for 6 hours. The memorial archway is large in size, and potential safety hazards of construction environment exist due to on-site heating and heat preservation. How to reduce the influence of the heating process on the body and the periphery, particularly on the foundation of the rolling mill and foundation bolts. The influence degree of large-volume heating temperature, heat insulation time heat conduction and heat radiation can ensure whether the temperature and time required by heating are reached and guarantee measures are taken. The welding process is modified in time according to the maximum temperature reached. How to handle post-weld residual stresses and stress concentration points. (2) The installation aperture is less, and the position is darker and other parts each other are sheltered from, and manual welding can't expand, need adopt the supplementary welding of arm. Therefore, the design of the standing position of the manipulator and the auxiliary tool is brought. Planning three-dimensional path and simulating motion. The welding of the segmentation station and the cutting piece is not allowed to ensure the welding continuity. These measures are to be operated and tested on site. Due to production requirements, no field viable tests could be performed. (3) The welding process, the selection of welding materials, the evaluation of welding procedures, the cladding repair and the test of a sampling piece are all required to be carried out on a site working condition simulation piece so as to ensure the cladding quality in the implementation process and avoid cracks and air hole defects. (4) Because the rolling mill housing works for a long time, most of the processed surfaces are seriously eroded, and the processed surfaces are difficult to be used as the reference of on-line machining. After the fatigue layer is machined and removed, annular cracks may exist at the reducing right angle and need to be turned into an R angle; if the crack depth is large, welding repair can be carried out. The capacity of a field power head and the capability of a processing cutter are prepared in advance according to the requirements of mechanical properties, hardness and tolerance after welding. The uncertainties described above all need to be verified technologically. At present, the verification mode of the large-area online vertical welding repair process for the large-volume mill housing mounting hole is not recorded.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: aiming at the defects of the prior art, the structural steel rolling mill housing repair simulation heating, welding and other processing can be conveniently and reliably realized, the on-site actual modification can be conveniently carried out according to the data recorded in the repair simulation process, the on-site repair accuracy is improved, the damage to the mounting hole caused by direct on-site repair is avoided, the manufacturing cost of a simulation piece is low, and the manufacturing period is short.
To solve the technical problem, the utility model discloses the technical scheme who takes does:
the utility model relates to a section steel rolling mill frame memorial archway restores simulation piece, including simulation piece subassembly I, simulation piece subassembly II, simulation piece subassembly I includes the intermediate part, and the intermediate part sets up the through-hole, and simulation piece subassembly II sets up to being drum mesostructure, and II inner walls of simulation piece subassembly set up lower part annular portion and upper portion annular portion, set up step portion between lower part annular portion and the upper portion annular portion.
The diameter of the lower annular part of the section steel rolling mill housing memorial archway repair simulation piece is set to be smaller than that of the upper annular part.
The diameter size of the through hole of the section steel rolling mill stand housing repairing simulation piece is set to be larger than that of the outer diameter of the simulation piece assembly II.
The simulation piece assembly I and the simulation piece assembly II are both of structures made of metal materials.
The simulation piece for repairing the housing of the section steel rolling mill frame further comprises a heating piece, and the heating piece comprises a heating suspension cage I and a heating suspension cage II.
I outer lane welding of heating cage a plurality of couples I, hang track heating plate I on the couple I, II outer lanes of heating cage a plurality of couples II, hang track heating plate II on the couple II.
The outer diameter of the heating suspension cage I is set to be larger than that of the heating suspension cage II.
The inner ring of the heating suspension cage I is provided with an asbestos blanket layer I.
And an inner ring of the heating suspension cage II is provided with an asbestos blanket layer II.
Adopt the technical scheme of the utility model, theory of operation and beneficial effect are as follows:
simulation piece is restoreed to shaped steel rolling mill frame memorial archway, before needs carry out the on-the-spot restoration to specific shaped steel rolling mill frame memorial archway, make the simulation piece earlier, the simulation piece of preparation is equivalent to the frame of memorial archway, that is to say, the simulation piece is the local of representing the memorial archway, both guaranteed that simulation restoration result is close on-the-spot restoration, reduce cost again does not need to make the too big, too many simulation piece of size. The through hole on the simulation piece assembly I is used for placing a simulation piece assembly II, and the simulation piece assembly I and the simulation piece assembly II are matched to form a simulated mounting hole. Considering manufacturing cost, the forging cycle is short and easy to realize, the simulation piece component I is formed by forging and pressing materials with low cost, and the appearance is roughly formed by rough machining. The simulation component II is a casting (the material can be selected from GS20Mn 5), is the same as the material of the rack body, ensures that the wall thickness of the simulation component II reaches more than 95mm, and can completely simulate the process requirements of welding, heating, welding defect generation and the like. The assembled simulation piece is vertically fixed on a concrete foundation by a bolt by simulating the state of a field rolling mill, and related mechanical arms and machining power heads can simulate occupying and aligning in a limited space of the rolling mill. Pre-welding preheating process simulation: the peripheral part of the frame is wrapped by a heat insulation material, then the small suspension cage is suspended into the lower annular part of the simulation piece, the large suspension cage is suspended into the upper annular part of the simulation piece, the outer vertical surface of the heating cage heats the inner wall of the simulation piece assembly II needing to be welded through the heating sheet suspended on the outer vertical surface of the heating cage, and the inner wall is provided with a heating blanket. Heat preservation of a welding room: after the heating device and the blanket and the suspension cage of the upper annular part are preheated to the set temperature, the heating blanket of the lower annular part keeps the heating state, and meanwhile, the upper part carries out the deposition welding operation. The interlayer temperature in the welding process is ensured in a heat transfer mode, the temperature of a welding part is ensured not to be reduced, a heating sheet can be covered if necessary, the heating mode with the same preheating mode is adopted for heat preservation after welding, and a pre-buried thermocouple monitors the temperature and time curve of the heating heat preservation in real time. Heating the welding position, and maintaining the temperature to remove part of residual stress. The heat dissipation of the rack is related to the surface area of the rack and the volume of the contact elements. The simulation piece is similar to the volume and the surface area of the lower part of the rack, and the protruding parts on two sides are similar to the upright posts of the rack, so that the heat dissipation (heat loss) can be completely simulated. The stand column of the frame is subjected to temperature inspection in the process, so that the temperature of the frame is prevented from being overheated in the actual field construction. Therefore, the method can effectively, conveniently and reliably realize the processes of repair, simulation heating, welding and the like of the housing of the section steel rolling mill, is convenient for simulation comparison of a welding method, comparison of welding materials and welding sequence test, samples are taken to carry out nondestructive inspection on a test piece, and is convenient for checking the processing performance of the materials. And (3) carrying out hardness inspection on the additive area, carrying out compression resistance, shearing resistance, tensile test, metallographic phase and fracture analysis, facilitating impact and corrosion resistance test, and verifying the optimal repair process. Shape steel rolling mill frame memorial archway restoration simulation piece, simple structure can conveniently reliably realize processing such as shape steel rolling mill frame memorial archway restoration simulation heating, welding, is convenient for carry out on-the-spot actual modification according to the data of restoreing the record in the simulation process, improves on-the-spot restoration accuracy, avoids direct on-the-spot restoration to cause the damage to the mounting hole to simulation piece low in manufacturing cost, manufacturing cycle is short.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic axial view structure diagram of a simulation component I and a simulation component II of the section steel mill stand memorial archway repair simulation member of the present invention when they are matched;
FIG. 2 is a schematic view of a cross-sectional structure of a simulation component I and a simulation component II of the section steel mill housing memorial archway repair simulation member of the present invention when they are matched;
FIG. 3 is a schematic cross-sectional view of a simulation member assembly I of the section steel rolling mill housing memorial archway repair simulation member of the present invention;
FIG. 4 is a schematic cross-sectional view of a simulation component II of the section steel rolling mill housing memorial archway repair simulation of the present invention;
FIG. 5 is a schematic structural view of a heating element of the section mill housing memorial archway repair simulation member of the present invention when used in a simulation member;
in the drawings, the reference numbers are respectively: 1. a simulation piece component I; 2. a simulation component II; 3. an intermediate portion; 4. a through hole; 5. a lower annular portion; 6. an upper annular portion; 7. a step portion; 8. a heating member; 9. heating the suspension cage I; 10. heating the suspension cage II; 11. a hook I; 12. a track heating plate I; 13. a hook II is hooked; 14. a track heating plate II; 15. a asbestos blanket layer I; 16. a asbestos blanket layer II; 17. an asbestos blanket.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings, for example, the shapes, structures, mutual positions and connection relations of the components, the functions and operation principles of the components, and the like:
as shown in the accompanying drawings 1-5, the utility model relates to a section steel rolling mill frame memorial archway restores analog, including analog subassembly I1, analog subassembly II 2, analog subassembly I1 includes intermediate part 3, and intermediate part 3 sets up through-hole 4, and analog subassembly II 2 sets up to be the drum mesostructure, and analog subassembly II 2 inner wall sets up lower part annular portion 5 and upper portion annular portion 6, sets up step portion 7 between lower part annular portion 5 and the upper portion annular portion 6. The structure provides an improved technical scheme aiming at the defects in the prior art. Before a specific memorial archway of the section steel rolling mill frame needs to be repaired on site, a simulation piece is manufactured firstly, the manufactured simulation piece is equivalent to the memorial archway frame, namely, the simulation piece only represents a local part of the memorial archway, so that the simulation repairing result is close to the site repairing, the cost is reduced, and the simulation piece with too large size and too much size does not need to be manufactured. The through hole on the simulation piece assembly I1 is used for placing a simulation piece assembly II 2, and the simulation piece assembly I1 and the simulation piece assembly II 2 are matched to form a simulated mounting hole. Considering the manufacturing cost, the forging period is short and easy to realize, the simulation component I1 is formed by forging and pressing materials with lower cost, and the appearance is roughly formed by rough machining. The simulation component II 2 is a casting (the material can be selected from GS20Mn 5), is the same as the material of the rack body, ensures that the wall thickness of the simulation component II reaches more than 95mm, and can completely simulate the process requirements of welding, heating, welding defect generation and the like. The assembled simulation piece simulates the state of a field rolling mill and is vertically fixed on a concrete foundation by a bolt, and related mechanical arms and machining power heads can simulate occupation and alignment in a limited space of the rolling mill. Pre-welding preheating process simulation: the peripheral part of the frame is wrapped by heat insulation materials, then a small suspension cage is suspended into a lower annular part 5 of the simulation piece, a large suspension cage is suspended into an upper annular part 6 of the simulation piece, the outer vertical surface of the heating cage heats the inner wall of the simulation piece assembly II 2 needing to be welded through a heating sheet suspended on the heating cage, and a heating blanket is arranged on the inner wall. Heat preservation of a welding room: after the heating device and the heating blanket and the suspension cage of the upper annular part 6 are removed after the heating device is preheated to the set temperature, the heating blanket of the lower annular part 5 keeps the heating state, and meanwhile, the upper part carries out the deposition welding operation. The interlayer temperature in the welding process is ensured in a heat transfer mode, the temperature of the welding part is ensured not to be reduced, a heating sheet can be covered if necessary, the heat preservation after welding adopts a heating mode the same as the preheating mode, and the welding part is heated and preserved to remove partial residual stress. The heat dissipation of the frame is related to the surface area of the frame and the volume of the contact elements. The simulation piece is similar to the volume and the surface area of the lower part of the rack, and the protruding parts on two sides are similar to the upright posts of the rack, so that the heat dissipation (heat loss) can be completely simulated. The stand column of the frame is subjected to temperature inspection in the process, so that the temperature of the frame is prevented from being overheated in the actual field construction. Therefore, the method can effectively, conveniently and reliably realize the processing of repair simulation heating, welding and the like of the housing of the section steel rolling mill, is convenient for carrying out on-site actual modification according to the data recorded in the repair simulation process, and improves the accuracy of on-site repair. Shape steel rolling mill frame memorial archway restoration simulation piece, simple structure can conveniently reliably realize processing such as shape steel rolling mill frame memorial archway restoration simulation heating, welding, is convenient for carry out on-the-spot actual modification according to the data of restoreing the record in the simulation process, improves on-the-spot restoration accuracy, avoids direct on-the-spot restoration to cause the damage to the mounting hole to simulation piece low in manufacturing cost, manufacturing cycle is short.
In the simulation piece is restoreed to shaped steel rolling mill frame memorial archway, simulation piece subassembly II be the foundry goods, GS20Mn5 is selected to the material, guarantees that its wall thickness reaches more than 95mm, can simulate technological requirements such as welding, heating, welding defect production completely. And sampling the destructive test block on the simulation piece II to perform subsequent mechanical property tests. And the simulation piece assembly I is transversely provided with a plurality of through holes, and then is longitudinally provided with a plurality of blind holes for embedding the thermocouples. And the simulation component II is subjected to rough machining and qualified flaw detection and then assembled with the simulation component I in an interference fit manner to form the rolling mill simulation component.
The diameter of the lower annular part 5 of the section steel rolling mill housing memorial archway repair simulation piece is set to be smaller than that of the upper annular part 6. In the above structure, the lower annular portion 5 and the upper annular portion 6 form a stepped hole structure having a large top and a small bottom. The diameter of the through hole 4 of the section steel rolling mill housing memorial archway repair simulation piece is set to be larger than the diameter of the outer diameter of the simulation piece assembly II 2. The simulation component assembly II 2 is of a structure which can be inserted into the through hole 4 in an interference mode. Above-mentioned structure, be convenient for in simulation subassembly II 2 puts into the through-hole, and the through-hole is greater than simulation subassembly II 2 slightly, avoids simulation subassembly II 2 to put into the back and rocks at will.
The simulation piece assembly I1 and the simulation piece assembly II 2 are both made of metal materials. Above-mentioned structure, considering manufacturing cost, the forging cycle is short easily to be realized, and the lower material of cost is adopted to simulate subassembly I1 and is forged and pressed and form, and the appearance only needs rough machining roughly to take shape. The simulation component II 2 is a casting and is made of the same material as the rack body, the wall thickness of the simulation component II is guaranteed to be more than 95mm, and technological requirements such as welding, heating and welding defect generation can be completely simulated.
As shown in the attached figure 5, the simulation part for repairing the memorial archway of the section steel rolling mill stand further comprises a heating part 8, and the heating part 8 comprises a heating suspension cage I9 and a heating suspension cage II 10. Heating cage I9 outer lane welding a plurality of couples I11, hang track heating plate I12 on couple I11, heating cage II 10 outer lane welding a plurality of couples II 13, hang track heating plate II 14 on couple II 13. The outer diameter of the heating cage I9 is set to be larger than that of the heating cage II 10. And an asbestos blanket layer I15 is arranged on the inner ring of the heating suspension cage I9. And an asbestos blanket layer II 116 is arranged on the inner ring of the heating suspension cage II 10. Above-mentioned structure through the setting of heating member, when the simulation is restoreed, can conveniently reliably heat the simulation piece to accurate simulation on-the-spot prosthetic environment reliably realizes on-the-spot heating, accuse temperature, heat preservation, satisfies build-up welding process requirement, is convenient for reliably carry out the simulation and restores, thereby obtains accurate result, improves on-the-spot restoration quality.
Simulation piece is restoreed to shaped steel rolling mill frame memorial archway, before needs carry out the on-the-spot restoration to specific shaped steel rolling mill frame memorial archway, make the simulation piece earlier, the simulation piece of preparation is equivalent to the frame of memorial archway, that is to say, the simulation piece is the local of representing the memorial archway only, both guaranteed that simulation restoration result is close on-the-spot restoration, reduce cost again does not need to make the too big, too many simulation piece of size. The through hole on the simulation piece assembly I is used for placing a simulation piece assembly II, and the simulation piece assembly I and the simulation piece assembly II are matched to form a simulated mounting hole. Considering manufacturing cost, the forging cycle is short and easy to realize, the simulation piece component I is formed by forging and pressing materials with low cost, and the appearance is roughly formed by rough machining. The simulation component II is a casting (the material can be selected from GS20Mn 5), is the same as the material of the rack body, ensures that the wall thickness of the simulation component II reaches more than 95mm, and can completely simulate the process requirements of welding, heating, welding defect generation and the like. The assembled simulation piece simulates the state of a field rolling mill and is vertically fixed on a concrete foundation by a bolt, and related mechanical arms and machining power heads can simulate occupation and alignment in a limited space of the rolling mill. Pre-welding preheating process simulation: the peripheral part of the frame is wrapped by a heat insulation material, then the small suspension cage is suspended into the lower annular part of the simulation piece, the large suspension cage is suspended into the upper annular part of the simulation piece, the outer vertical surface of the heating cage heats the inner wall of the simulation piece assembly II needing to be welded through the heating sheet suspended on the outer vertical surface of the heating cage, and the inner wall is provided with a heating blanket. Heat preservation of a welding room: after the heating device and the blanket and the suspension cage of the upper annular part are preheated to the set temperature, the heating blanket of the lower annular part keeps the heating state, and meanwhile, the upper part carries out deposition welding operation. The interlayer temperature in the welding process is ensured in a heat transfer mode, the temperature of the welding part is ensured not to be reduced, a heating sheet can be covered if necessary, the heat preservation after welding adopts a heating mode the same as the preheating mode, and the welding part is heated and preserved to remove partial residual stress. The heat dissipation of the rack is related to the surface area of the rack and the volume of the contact elements. The simulation piece is similar to the volume and the surface area of the lower part of the rack, and the protruding parts on two sides are similar to the upright posts of the rack, so that the heat dissipation (heat loss) can be completely simulated. The stand column of the frame is subjected to temperature inspection in the process, so that the temperature of the frame is prevented from being overheated in the actual field construction. Therefore, the method can effectively, conveniently and reliably realize the processing of repair simulation heating, welding and the like of the housing of the section steel rolling mill, is convenient for carrying out on-site actual modification according to the data recorded in the repair simulation process, and improves the accuracy of on-site repair. Simulation piece is restoreed to shaped steel rolling mill frame memorial archway, simple structure can conveniently reliably realize shaped steel rolling mill frame memorial archway restoration simulation heating, execute processing such as welding, is convenient for carry out on-the-spot actual modification according to the data of restoreing the simulation in-process record, improves on-the-spot restoration accuracy, avoids direct on-the-spot restoration to cause the damage to the mounting hole to simulation piece low in manufacturing cost, manufacturing cycle is short.
The present invention has been described in detail with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above embodiments, and the present invention can be implemented in various ways without modification, and the present invention is not limited by the above embodiments.
Claims (10)
1. The utility model provides a section steel rolling mill frame memorial archway restores simulation piece which characterized in that: including a simulation subassembly I (1), a simulation subassembly II (2), a simulation subassembly I (1) includes intermediate part (3), intermediate part (3) set up through-hole (4), a simulation subassembly II (2) set up to be the drum mesostructure, a simulation subassembly II (2) inner wall sets up lower part annular portion (5) and upper portion annular portion (6), sets up step portion (7) between lower part annular portion (5) and upper portion annular portion (6).
2. The section mill housing memorial archway restoration simulation piece of claim 1, wherein: the diameter of the lower annular part (5) of the section steel rolling mill housing memorial archway repair simulation piece is set to be smaller than that of the upper annular part (6).
3. The section mill stand memorial archway restoration dummy of claim 1 or 2, wherein: the diameter of the through hole (4) of the section steel rolling mill housing memorial archway repair simulation piece is set to be larger than the diameter of the outer diameter of the simulation piece component II (2).
4. The section mill stand memorial archway restoration dummy of claim 1 or 2, wherein: the simulation component assembly II (2) is set to be of a structure capable of being inserted into the through hole (4).
5. The section mill stand memorial archway restoration dummy of claim 1 or 2, wherein: the simulation piece assembly I (1) and the simulation piece assembly II (2) are both of structures made of metal materials.
6. The section mill stand memorial archway restoration dummy of claim 1 or 2, wherein: the simulation piece for repairing the housing of the section steel rolling mill is characterized by further comprising a heating piece (8), wherein the heating piece (8) comprises a heating suspension cage I (9) and a heating suspension cage II (10).
7. The section mill housing memorial archway restoration simulation piece of claim 6, wherein: heating cage I (9) outer lane welding a plurality of couples I (11), hang track heating plate I (12) on couple I (11), heating cage II (10) outer lane welding a plurality of couples II (13), hang track heating plate II (14) on couple II (13).
8. The section mill housing memorial archway restoration simulation piece of claim 6, wherein: the outer diameter of the heating suspension cage I (9) is set to be larger than that of the heating suspension cage II (10).
9. The section mill housing memorial archway restoration simulation piece of claim 7, wherein: and an asbestos blanket layer I (15) is arranged at the inner ring of the heating suspension cage I (9).
10. The section mill stand memorial archway restoration simulator of claim 9, wherein: and an asbestos blanket layer II (116) is arranged on the inner ring of the heating suspension cage II (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221215421.2U CN217667555U (en) | 2022-05-18 | 2022-05-18 | Profile steel rolling mill frame memorial archway restoration simulation piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221215421.2U CN217667555U (en) | 2022-05-18 | 2022-05-18 | Profile steel rolling mill frame memorial archway restoration simulation piece |
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| Publication Number | Publication Date |
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| CN217667555U true CN217667555U (en) | 2022-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221215421.2U Active CN217667555U (en) | 2022-05-18 | 2022-05-18 | Profile steel rolling mill frame memorial archway restoration simulation piece |
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| CN (1) | CN217667555U (en) |
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