CN212388083U - High-efficient natural gas annealing stove of oriented silicon steel - Google Patents
High-efficient natural gas annealing stove of oriented silicon steel Download PDFInfo
- Publication number
- CN212388083U CN212388083U CN202021330695.7U CN202021330695U CN212388083U CN 212388083 U CN212388083 U CN 212388083U CN 202021330695 U CN202021330695 U CN 202021330695U CN 212388083 U CN212388083 U CN 212388083U
- Authority
- CN
- China
- Prior art keywords
- annealing
- furnace body
- furnace
- silicon steel
- annealing furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The utility model belongs to the technical field of annealing stove, specifically disclose a high-efficient natural gas annealing stove of oriented silicon steel, including annealing furnace body (2), annealing platform truck (1), burner (6) and fume extractor (5), the both ends face is provided with furnace body side seal furnace gate (3), its characterized in that about annealing furnace body (2): the annealing trolley (1) is positioned on the outer side of the annealing furnace body (2) and can move into the annealing furnace body (2) along a track, a furnace body lower sealing device (4) for pressing and sealing the annealing trolley (1) is arranged below the front outer side and the rear outer side of the annealing furnace body (2), and the combustion device (6) and the smoke exhaust device (5) are respectively positioned on the outer side of the annealing furnace body (2) and are communicated with the annealing furnace body (2); simple structure, reasonable in design can effectively improve the annealing efficiency of the whole roll of oriented silicon steel in the stove.
Description
Technical Field
The utility model belongs to the technical field of annealing stove, specifically relate to a high-efficient natural gas annealing stove of oriented silicon steel.
Background
The annealing furnace equipment of the oriented silicon steel mostly adopts a monomer electric bell type furnace method and a stepping tunnel kiln method at present. The single electric bell-type furnace is annealed by an electric heating method, the energy consumption is large, the annealing furnace is provided with inner covers and outer covers, each group is provided with three inner covers and two outer covers, the manufacturing cost is high, and the annealing production efficiency is low; only one coil can be discharged at a time by the stepping tunnel kiln, the furnace door and the atmosphere pipeline are required to be opened and disassembled when one coil is discharged, the operation is complicated, and the temperature control cannot reach within +/-5 ℃.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high-efficient natural gas annealing stove of oriented silicon steel, simple structure, reasonable in design, the operation security performance is high, and the energy consumption is low, can effectively improve the whole efficiency of rolling up in the stove of oriented silicon steel.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a high-efficient natural gas annealing stove of oriented silicon steel, includes annealing furnace body, annealing platform truck, burner and fume extractor, and the both ends face is provided with furnace body side seal furnace gate, its characterized in that about annealing furnace body: the annealing trolley is positioned on the outer side of the annealing furnace body and can move into the annealing furnace body along a track, a furnace body lower sealing device used for pressing and sealing the annealing trolley is arranged below the front outer side and the rear outer side of the annealing furnace body, and the combustion device and the smoke exhaust device are respectively positioned on the outer side of the annealing furnace body and communicated with the annealing furnace body.
Preferably, the annealing trolley is provided with two trolleys which are respectively positioned at the left side and the right side of the annealing furnace body.
Further, annealing platform truck includes the driving mechanism that frame and drive frame travel, has placed many sets of silicon steel coils on the frame, is provided with the heat preservation between silicon steel coil and the frame, silicon steel coil is sealed and is filled into through annealing safety cover and sealed husky A and has had protective atmosphere.
Further, the lower portion of the frame is provided with an air inlet pipeline and an air outlet pipeline of protective atmosphere, the interface of the air inlet pipeline is arranged on the side of the annealing trolley, air outlet pipe heads are exposed at all stations on the annealing trolley, and the air outlet pipeline is connected to the side face of the annealing trolley through all stations on the table top and is provided with a valve for air exhaust.
Preferably, the annealing furnace body comprises a furnace shell and a furnace body lining, and the furnace body lining is arranged on the inner wall of the furnace shell.
Preferably, the furnace body side sealing furnace door comprises a furnace door shell, a furnace door lining and a furnace door lifting mechanism, wherein the furnace door lining is arranged on the inner wall of the furnace door shell, the furnace door lifting mechanism is connected with the furnace door shell and used for driving the furnace body side sealing furnace door to move up and down, and the furnace body side sealing furnace door is locked and sealed by a hydraulic locking mechanism arranged at the furnace door shell in a sealing state.
Further, the sealing device under the furnace body comprises a hinge, a hydraulic cylinder and a sealing box, the hinge is installed below the outer side wall of the furnace shell, the hydraulic cylinder is connected with the hinge and the sealing box, and sealing sand B is arranged in the sealing box.
Preferably, the smoke exhaust device comprises a flue, a heat exchanger, a waste heat connecting pipeline, an isolating device and a chimney, the lower end of the flue is communicated with the interior of the annealing furnace body, the upper end of the flue is connected with one end of the heat exchanger, one end of the waste heat connecting pipeline is connected with the other end of the heat exchanger, the isolating device is used for controlling smoke exhaust, and the chimney is used for exhausting smoke.
Furthermore, the combustion device comprises a burner, a gas pipeline and a combustion-supporting air pipeline, the burner is installed on the side wall of the annealing furnace body and communicated with the inside of the annealing furnace body, one end of the combustion-supporting air pipeline is connected with a combustion-supporting fan, the other end of the combustion-supporting air pipeline is connected with the heat exchanger, and the gas pipeline is connected with the burner.
Preferably, the side wall of the annealing furnace body is provided with a temperature measuring device, and the temperature measuring device is communicated with the inner wall of the annealing furnace.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides an orientation silicon steel high-efficient annealing stove and annealing method, place many rolls of silicon steel coils on annealing platform truck, it is sealed with annealing safety cover and sealed sand, in with annealing platform truck immigration annealing furnace body through running gear, through controlling the sealed furnace gate of side furnace body, sealing device under the furnace body, it is sealed to compress tightly annealing platform truck, accesss to the nozzle with combustion-supporting air pipeline through combustion-supporting fan, it heats the coil of strip on the interior annealing platform truck of stove to let in the nozzle gas pipeline to the interior flame projecting of annealing furnace body, through annealing time-temperature curve graph, come effective control annealing effect, the flue gas that the nozzle produced flows through the flue, the heat exchanger, partly hot flue gas passes through the pipe supply combustion-supporting wind, partly hot flue gas can be used as the intensification of neighbouring production line and preheat. Particularly, the utility model discloses in, each annealing platform truck about adopting, the preparation before annealing, cooling, the coil stripping work after the annealing have been practiced thrift investment cost in turn, have improved annealing efficiency.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Fig. 2 is a front view of the present invention.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a left side view of fig. 2.
FIG. 5 is a graph of the annealing time-temperature curve of the oriented silicon steel of the present invention.
In the figure: 1-annealing trolley, 2-annealing furnace body, 3-furnace body side sealing furnace door, 4-furnace body lower sealing device, 5-smoke exhaust device, 6-combustion system, 7-temperature measuring device, 101-frame, 102-heat insulating layer, 103-travelling mechanism, 104-silicon steel coil, 105-annealing protective cover, 106-sealing sand A, 107-protective atmosphere, 108-air inlet pipeline, 109-exhaust pipeline, 201-furnace shell, 202-furnace body lining, 301-furnace door shell, 302-furnace door lining, 303-furnace door lifting mechanism, 304-hydraulic locking mechanism, 401-hinge, 402-hydraulic cylinder, 403-sealing box, 404-sealing sand B, 501-flue, 502-heat exchanger, 503-waste heat connecting pipeline, 403-waste heat connecting pipeline, 504-isolation device, 505-chimney, 601-burner, 602-gas pipeline, 603-combustion-supporting air pipeline.
Detailed Description
As shown in fig. 2-4, the utility model relates to an oriented silicon steel high-efficiency natural gas annealing furnace, which comprises an annealing furnace body 2, an annealing trolley 1, a combustion device 6 and a smoke exhaust device 5. The left end surface and the right end surface of the annealing furnace body 2 are provided with furnace body side sealing furnace doors 3, the annealing trolley 1 is positioned outside the annealing furnace body 2 and can move into the annealing furnace body 2 along a track, and the two annealing trolleys 1 are respectively positioned at the left side and the right side of the annealing furnace body 2; the annealing trolley 1 comprises a frame 101 and a travelling mechanism 103 for driving the frame to run, wherein at least eight sets of silicon steel coils 104 are arranged on the frame 101, an insulating layer 102 is arranged between the silicon steel coils 104 and the frame 101, and the silicon steel coils 104 are sealed by an annealing protective cover 105 and annular sealing sand A106 and filled with protective atmosphere 107; the lower part of the frame 101 is provided with an air inlet pipeline 108 and an air outlet pipeline 109 of protective atmosphere, the interface of the air inlet pipeline 108 is arranged on the side of the annealing trolley 1, air outlet pipe heads are exposed at each station on the annealing trolley 1, and the air outlet pipeline 109 is connected to the side of the annealing trolley 1 through each station on the table top and is provided with a valve for air exhaust.
When the annealing trolley 1 is arranged outside the annealing furnace body 2, the silicon steel coil 104 is firstly hung on each station above the heat-insulating layer 102 on the frame 101, and then the annealing protective cover 105 is covered, so that the lower end of the annealing protective cover fully enters annular sealing sand A106 for sand sealing. After the inspection, the gas inlet pipeline 108 of the protective atmosphere is connected to the gas outlet pipeline 109 on the side surface of the annealing trolley, the valve is opened for inflation, when certain pressure is reached, the valve is closed, the outer pipeline is disconnected, and the preparation work is finished. The annealing trolley 1 enters the annealing furnace body 2 under the driving of the traveling mechanism 103, and limit switches are arranged on the annealing trolley in and out and audible and visual signal reminding is arranged.
The annealing furnace body 2 includes a furnace shell 201 and a furnace body lining 202, and the furnace body lining 202 is disposed on the inner wall of the furnace shell 201. The furnace shell 201 is a steel structure welding part, comprises an upper cross beam, and is welded by a truss structure in order to meet the rigidity requirement of the annealing furnace body 2.
The furnace body side sealing furnace door 3 comprises a furnace door shell 301, a furnace door lining 302 and a furnace door lifting mechanism 303, wherein the furnace door lining 302 is arranged on the inner wall of the furnace door shell 301, the furnace door lifting mechanism 303 is connected with the furnace door shell 301 and used for driving the furnace body side sealing furnace door 3 to move up and down, and the furnace body side sealing furnace door 3 is locked and sealed by a hydraulic locking mechanism 304 arranged at the furnace door shell 301 in a sealing state.
As shown in fig. 3, a furnace body lower sealing device 4 for pressing and sealing the annealing trolley 1 is arranged below the front and back outer sides of the annealing furnace body 2, the furnace body lower sealing device 4 comprises a hinge 401, a hydraulic cylinder 402 and a sealing box 403, the hinge 401 is arranged below the outer side wall of the furnace shell 201, the hydraulic cylinder 402 is connected with the hinge 401 and the sealing box 403, and sealing sand B404 is filled in the sealing box 403.
The combustion device 6 and the smoke exhaust device 5 are respectively positioned outside the annealing furnace body 2 and communicated with the annealing furnace body 2.
The smoke exhaust device 5 comprises a flue 501, a heat exchanger 502, a waste heat connecting pipeline 503, an isolating device 504 and a chimney 505, wherein the lower end of the flue 501 is communicated with the interior of the annealing furnace body 2, the upper end of the flue 501 is connected with one end of the heat exchanger 502, one end of the waste heat connecting pipeline 503 is connected with the other end of the heat exchanger 502, the isolating device 504 is used for controlling smoke exhaust, and the chimney 505 is used for exhausting smoke.
The combustion device 6 comprises a burner 601, a gas pipeline 602 and a combustion-supporting air pipeline 603, the burner 601 is installed on the side wall of the annealing furnace body 2 and is communicated with the inside of the annealing furnace body 2, one end of the combustion-supporting air pipeline 603 is connected with a combustion-supporting fan, the other end of the combustion-supporting air pipeline 603 is connected with the heat exchanger 502, and the gas pipeline 602 is connected with the burner 601.
The side wall of the annealing furnace body 2 is provided with a temperature measuring device 7, and the temperature measuring device 7 is communicated with the inner wall of the annealing furnace.
FIG. 5 is a graph of the annealing time-temperature curve of the present invention, which controls the annealing temperature rise of the oriented silicon steel in the furnace through the control system, the temperature measuring device 7 and the combustion device 6.
Specifically, referring to fig. 1, the annealing method of the oriented silicon steel high-efficiency natural gas annealing furnace of the present invention comprises the steps of hoisting a silicon steel coil 104 onto an annealing trolley 1, covering an annealing protection cover 105, completely sealing the lower part of the annealing protection cover 105 with a sealing sand a 106, opening a furnace body side sealing furnace door 3 on one side of the annealing trolley 1, simultaneously opening a furnace body lower sealing device 4, starting the annealing trolley 1 to enter an annealing furnace body 2, closing the furnace body side sealing furnace door 3 and the furnace body lower sealing device 4 after reaching a fixed position controlled by a limit switch, wherein the furnace body side sealing furnace doors on both sides are locked and sealed by a hydraulic locking mechanism 304 arranged at a furnace shell, sealing sand B404 of the furnace body lower sealing device 4 seals a gap between the annealing furnace body 2 and the annealing trolley 1, connecting a hose at the fixed end of a protective atmosphere 107 to an air inlet pipe 108 on the side of the annealing trolley 1, the valves of the atmosphere pipes are opened, the atmosphere is introduced into the annealing protective covers 105, and the content of each atmosphere is detected by a detection instrument. And starting the annealing furnace temperature control system, the gas system and the combustion-supporting air system, setting all parameters of the system, starting heating, and carrying out heating, heat preservation and cooling according to an annealing time-temperature curve graph. The temperature measured by the temperature measuring device 7 is fed back to the control system, and the control system controls the start and stop of the combustion device 6 according to the fed back temperature, so that the annealing temperature in the furnace body is controlled. And after finishing annealing temperature rise and heat preservation, cooling to 300 ℃ and discharging, adjusting the atmosphere in the atmosphere pipelines according to the process requirements before discharging, then closing valves of all the atmosphere pipelines, dismounting the protective atmosphere fixed end hose, lifting the side sealing furnace door 3, starting the traveling mechanism 103 of the annealing trolley 1, and discharging the annealing trolley 1. Before the annealing trolley 1 in the annealing furnace body 2 is taken out of the furnace, the preparation process of hoisting the steel coil 104 is completed by the annealing trolley outside the other furnace body, so that after the annealing trolley in the annealing furnace body 2 is taken out of the furnace, the other annealing trolley can enter the furnace for annealing treatment. Thus, annealing is carried out periodically, and the feeding and blanking are prepared by fully utilizing the interval time.
To sum up, the utility model relates to a high-efficient natural gas annealing stove of oriented silicon steel has following advantage:
the left and right annealing trolleys are adopted, at least 8 silicon steel coils are placed on each annealing trolley, the two annealing trolleys alternately perform preparation before annealing, cooling after annealing and coil unloading, combustion waste gas is secondarily utilized, the occupied area of the annealing furnace is small, the investment cost is low, and the annealing efficiency is high.
Above, only the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing to above embodiment the utility model discloses technical scheme's protection scope.
Claims (10)
1. The utility model provides an orientation silicon steel high-efficient natural gas annealing stove, includes annealing furnace body (2), annealing platform truck (1), burner (6) and fume extractor (5), and both ends face is provided with furnace body side seal furnace gate (3), its characterized in that about annealing furnace body (2): the annealing trolley (1) is located on the outer side of the annealing furnace body (2) and can move into the annealing furnace body (2) along a track, a furnace body lower sealing device (4) used for pressing and sealing the annealing trolley (1) is arranged below the front outer side and the rear outer side of the annealing furnace body (2), and the combustion device (6) and the smoke exhaust device (5) are respectively located on the outer side of the annealing furnace body (2) and communicated with the annealing furnace body (2).
2. The high-efficiency natural gas annealing furnace for oriented silicon steel as claimed in claim 1, wherein: the annealing trolley (1) is provided with two trolleys which are respectively positioned at the left side and the right side of the annealing furnace body (2).
3. The oriented silicon steel high-efficiency natural gas annealing furnace according to claim 1 or 2, characterized in that: annealing platform truck (1) is including frame (101) and driving vehicle structure (103) that the frame traveled, has placed many sets of silicon steel coils (104) on frame (101), is provided with between silicon steel coils (104) and frame (101) heat preservation (102), silicon steel coils (104) are sealed and are filled into through annealing safety cover (105) and sealed husky A (106) and have protective atmosphere (107).
4. The high-efficiency natural gas annealing furnace for oriented silicon steel as claimed in claim 3, wherein: the frame (101) lower part is provided with inlet duct (108) and exhaust duct (109) of protective atmosphere, the interface setting of inlet duct (108) is in annealing platform truck (1) side to each station department exposes out the gas outlet pipe head on annealing platform truck (1), and exhaust duct (109) are connected to annealing platform truck (1) side through each station of mesa, and install the valve exhaust.
5. The high-efficiency natural gas annealing furnace for oriented silicon steel as claimed in claim 1, wherein: the annealing furnace body (2) comprises a furnace shell (201) and a furnace body lining (202), wherein the furnace body lining (202) is arranged on the inner wall of the furnace shell (201).
6. The high-efficiency natural gas annealing furnace for oriented silicon steel as claimed in claim 1, wherein: furnace body side seal furnace gate (3) are including furnace gate shell (301), furnace gate inside lining (302) and furnace gate elevating system (303), furnace gate inside lining (302) set up at furnace gate shell (301) inner wall, furnace gate elevating system (303) are connected with furnace gate shell (301) and are used for the drive furnace body side seal furnace gate (3) up-and-down motion, furnace body side seal furnace gate (3) are locked and sealed by hydraulic locking mechanism (304) that set up in furnace gate shell (301) department under encapsulated situation.
7. The high-efficiency natural gas annealing furnace for oriented silicon steel as claimed in claim 5, wherein: the sealing device (4) under the furnace body comprises a hinge (401), a hydraulic cylinder (402) and a sealing box (403), wherein the hinge (401) is installed below the outer side wall of the furnace shell (201), the hydraulic cylinder (402) is connected with the hinge (401) and the sealing box (403), and sealing sand B (404) is installed in the sealing box (403).
8. The high-efficiency natural gas annealing furnace for oriented silicon steel as claimed in claim 1, wherein: the smoke exhaust device (5) comprises a flue (501), a heat exchanger (502), a waste heat connecting pipeline (503), an isolating device (504) and a chimney (505), wherein the lower end of the flue (501) is communicated with the interior of the annealing furnace body (2), the upper end of the flue (501) is connected with one end of the heat exchanger (502), one end of the waste heat connecting pipeline (503) is connected with the other end of the heat exchanger (502), the isolating device (504) is used for controlling smoke exhaust, and the chimney (505) is used for exhausting smoke.
9. The high-efficiency natural gas annealing furnace for oriented silicon steel as claimed in claim 8, wherein: the combustion device (6) comprises a burner (601), a gas pipeline (602) and a combustion-supporting air pipeline (603), wherein the burner (601) is installed on the side wall of the annealing furnace body (2) and is communicated with the inside of the annealing furnace body (2), one end of the combustion-supporting air pipeline (603) is connected with a combustion-supporting fan, the other end of the combustion-supporting air pipeline is connected with the heat exchanger (502), and the gas pipeline (602) is connected with the burner (601).
10. The high-efficiency natural gas annealing furnace for oriented silicon steel as claimed in claim 1, wherein: the side wall of the annealing furnace body (2) is provided with a temperature measuring device (7), and the temperature measuring device (7) is communicated with the inner wall of the annealing furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021330695.7U CN212388083U (en) | 2020-07-09 | 2020-07-09 | High-efficient natural gas annealing stove of oriented silicon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021330695.7U CN212388083U (en) | 2020-07-09 | 2020-07-09 | High-efficient natural gas annealing stove of oriented silicon steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212388083U true CN212388083U (en) | 2021-01-22 |
Family
ID=74254481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021330695.7U Active CN212388083U (en) | 2020-07-09 | 2020-07-09 | High-efficient natural gas annealing stove of oriented silicon steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212388083U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111593195A (en) * | 2020-07-09 | 2020-08-28 | 佛山市君诚宇机械设备有限公司 | High-efficient natural gas annealing stove of oriented silicon steel |
| CN115927819A (en) * | 2022-11-23 | 2023-04-07 | 江苏亚太安信达铝业有限公司 | Annealing furnace for aluminum alloy material processing and annealing process thereof |
-
2020
- 2020-07-09 CN CN202021330695.7U patent/CN212388083U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111593195A (en) * | 2020-07-09 | 2020-08-28 | 佛山市君诚宇机械设备有限公司 | High-efficient natural gas annealing stove of oriented silicon steel |
| CN115927819A (en) * | 2022-11-23 | 2023-04-07 | 江苏亚太安信达铝业有限公司 | Annealing furnace for aluminum alloy material processing and annealing process thereof |
| CN115927819B (en) * | 2022-11-23 | 2024-05-14 | 江苏亚太安信达铝业有限公司 | Annealing furnace for processing aluminum alloy material and annealing process thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111593195A (en) | High-efficient natural gas annealing stove of oriented silicon steel | |
| CN212388083U (en) | High-efficient natural gas annealing stove of oriented silicon steel | |
| CN201512560U (en) | Car-type high-temperature gas thermal treatment stove | |
| CN101586225B (en) | Vacuum hardening method and a vacuum hardening apparatus used | |
| CN104515393B (en) | It is passed through the mobile trolley used stove of atmosphere bell-type | |
| CN206207993U (en) | Multifunctional box resistance furnace | |
| CN105617943A (en) | Large-volume vacuum cracking furnace | |
| CN102925635A (en) | Rail locomotive bolster lateral frame continuous pushing-disc type heat treatment production line | |
| CN210085520U (en) | Stainless steel strip annealing furnace | |
| CN102419085B (en) | Microwave and electrical dual-firing top-hat kiln | |
| CN102425939A (en) | Microwave heating bell kiln | |
| CN209877669U (en) | Industrial flue gas waste heat recovery device | |
| CN201376983Y (en) | Vacuum quenching device | |
| CN201317804Y (en) | Gas fired aluminium alloy quenching furnace | |
| CN203572221U (en) | Atmosphere inlet cover-type mobile trolley furnace | |
| CN202371989U (en) | Microwave heating bell kiln | |
| CN213713922U (en) | High-melting-efficiency low-loss melting furnace | |
| CN212357303U (en) | Muffle-tank-free pre-vacuumizing atmosphere protection furnace | |
| CN206680531U (en) | A kind of double tank anaerobic annealing furnaces | |
| CN202371988U (en) | Microwave and electric mixing-type heating bell kiln | |
| CN109425226B (en) | Off-line baking equipment | |
| CN206940953U (en) | A kind of solid smelting furnace for solution heat treatment station boiler stainless steel tube row | |
| CN102914146A (en) | Ultrahigh temperature nitriding tunnel kiln | |
| CN111876577A (en) | Special trolley for multi-station vertical cast tube annealing furnace and trolley type annealing furnace | |
| CN220665397U (en) | Oriented silicon steel trolley type high-temperature annealing furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |