CN206173406U - Continuous annealing furnace humidifier protective gas dew point hoisting device - Google Patents
Continuous annealing furnace humidifier protective gas dew point hoisting device Download PDFInfo
- Publication number
- CN206173406U CN206173406U CN201621202325.9U CN201621202325U CN206173406U CN 206173406 U CN206173406 U CN 206173406U CN 201621202325 U CN201621202325 U CN 201621202325U CN 206173406 U CN206173406 U CN 206173406U
- Authority
- CN
- China
- Prior art keywords
- humidifier
- protective gas
- dew point
- steam
- 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
- 230000001681 protective effect Effects 0.000 title claims abstract description 62
- 238000000137 annealing Methods 0.000 title claims abstract description 34
- 239000007921 spray Substances 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 17
- 238000010025 steaming Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910000976 Electrical steel Inorganic materials 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 51
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- 238000000034 method Methods 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000010259 detection of temperature stimulus Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model relates to a continuous annealing furnace humidifier protective gas dew point hoisting device, humidifier are connected with the protective gas pipeline, steam lets in the main line and gives vent to anger the pipeline, this protective gas dew point hoisting device include: steam lets in looped pipeline way, temperature sensor and the control unit. Steam lets in the one end and vapour source tube coupling on looped pipeline way, the other end and humidifier fixed connection, temperature sensor sets up on the outlet duct way to protective gas's temperature generates the temperature value in the measuring export pipeline. Steam lets in the main line and is provided with flow control valve, the control unit and temperature sensor and flow control valve are connected, the control unit generates control command after carrying out the comparison with temperature value and settlement temperature value, sends control command and carries out flow control to flow control valve. This protective gas dew point hoisting device can promote protective gas's dew point temperature rapidly, to protective gas's the high accuracy control of dew point, satisfies the high dew point of oriented silicon steel low temperature technology, high accuracy control requirement.
Description
Technical field
The utility model is related to metallurgical technology field, and more particularly to a kind of continuous annealing furnace humidifier protective gas dew point is carried
Rise device.
Background technology
Orientation silicon steel in continuous annealing furnace when being made annealing treatment, it is desirable to which annealing furnace has enough sealings, together
When will in annealing furnace full of different proportion nitrogen hydrogen hybrid protection gas.The dew point of nitrogen hydrogen hybrid protection gas can affect strip
Decarburization effect, also affect the composition and content ratio of belt steel surface oxide, therefore continuous annealing furnace humidifier outlet nitrogen hydrogen
Hybrid protection gas dew point stability contorting, is the key technology for affecting operation end product quality after orientation silicon steel.
With the exploitation of orientation silicon steel low temperature process, to continuous annealing unit annealing furnace humidifier outlet nitrogen hydrogen hybrid protection
The dew point of gas proposes higher, tightened up requirement, and dew-point temperature requires to bring up to 60-75 DEG C by original 40-55 DEG C, dew point
Control accuracy brings up to ± 0.5 DEG C by original ± 1 DEG C.
Existing orientation silicon steel continuous annealing unit annealing furnace humidifier outlet nitrogen hydrogen hybrid protection gas dew point is up to
65 DEG C, and dew point control accuracy is ± 1 DEG C, it is impossible to meet the requirement of orientation silicon steel low temperature process production.Therefore, how to be lifted and taken
To silicon steel continuous annealing unit annealing furnace humidifier outlet nitrogen hydrogen hybrid protection gas dew point, become Field Force's urgent need to resolve
One technical barrier.
Utility model content
A kind of continuous annealing furnace humidifier protective gas dew point lifting device that the application is provided, solves or part solves
The inadequate technical problem of protective gas dew-point temperature and dew point precision controlling in prior art, realizes and rapid lifts shielding gas
The dew-point temperature of body, the dew point high-precision control to protective gas meets the high dew point of orientation silicon steel low temperature process, high-precision control
The technique effect of requirement.
This application provides a kind of continuous annealing furnace humidifier protective gas dew point lifting device, the humidifier is connected with
Protective gas pipeline, steam are passed through main line and outlet pipe；The steam is passed through main line and is connected with vapour source pipeline, makes steaming
Vapour is sent into inside the humidifier；The continuous annealing furnace humidifier protective gas dew point lifting device includes：
Steam is passed through looped pipeline road, and one end is connected with the vapour source pipeline, and the other end is fixedly connected with the humidifier；
Temperature sensor, is arranged on the outlet pipe, to detect the outlet pipe in protective gas temperature, it is raw
Into temperature value；
The steam is passed through main line and is provided with flow control valve；
Control unit, is connected with the temperature sensor and the flow control valve；Described control unit receives the temperature
The temperature value that degree sensor sends, after the temperature value and set temperature value are compared control instruction is generated, and is sent
The control instruction to the flow control valve carries out Flow-rate adjustment.
Preferably, the humidifier is connected with spray liquid circulation line；
The spray liquid circulation line makes spray liquid circulate in the inside of the humidifier.
Preferably, the humidifier is provided with spray system；The spray system includes：Shower, delivery pump and spray
Head；
One end of the shower is connected with the bottom of the humidifier, and the other end is connected with the shower nozzle；
The shower nozzle is arranged on the top of the humidifier；
The delivery pump is arranged on the shower, and the spray liquid of the humidifier bottom is guided on the shower nozzle.
Preferably, the spray liquid is desalted water.
Preferably, the steam is passed through main line is additionally provided with stop valve；
The flow control valve is arranged between the stop valve and the humidifier.
Preferably, the entry position of the protective gas pipeline is passed through main line higher than the steam and the steam is logical
Enter the entry position on looped pipeline road.
Preferably, the outlet pipe stretches into the inside of the humidifier, the position of the mouth of pipe is less than the protective gas
The entry position of pipeline.
Preferably, the steam is passed through looped pipeline road is provided with two hand-operated valves.
Preferably, the caliber that the steam is passed through looped pipeline road is identical with the caliber that the steam is passed through main line.
Preferably, the temperature information generates control instruction after being compared with set temperature value, including：
When the temperature value is less than the set temperature value, the control instruction controls the flow control valve and increases institute
State the flow of steam；
When the temperature value is more than the set temperature value, the control instruction controls the flow control valve and reduces institute
State the flow of steam.
One or more technical schemes provided herein, at least have the following technical effect that or advantage：
Looped pipeline road is passed through as a result of steam is set up on humidifier, the intake of humidifier steam inside is increased,
The dew-point temperature of protective gas can rapidly be lifted；By arranging temperature sensor on outlet pipe, to detect outlet pipe in
The temperature of protective gas, and temperature sensor is connected with control unit, control unit receives the temperature that temperature sensor sends
Value, after temperature value and set temperature value are compared control instruction is generated, and flow control valve is flowed by control instruction
Amount is adjusted, and the dew point high-precision control of protective gas is realized then.So, protective gas dew point in prior art is efficiently solved
The inadequate technical problem of temperature and dew point precision controlling, realizes the rapid dew-point temperature for lifting protective gas, to protective gas
Dew point high-precision control, meet the high dew point of orientation silicon steel low temperature process, the technique effect of high-precision control requirement.
Description of the drawings
The structure of the continuous annealing furnace humidifier protective gas dew point lifting device that Fig. 1 is provided for the utility model embodiment
Schematic diagram.
(part that each label is represented in diagram is followed successively by：1 protective gas pipeline, 2 vapour source pipelines, 3 steam are passed through supervisor
Road, 4 steam are passed through looped pipeline road, 5 stop valves, 6 flow control valves, 7 first manual valves, 8 second hand-operated valves, 9 spray liquid circulation pipes
Road, 10 humidifiers, 11 temperature sensors, 12 outlet pipes, 13 spray systems, 14 control units)
Specific embodiment
A kind of continuous annealing furnace humidifier protective gas dew point lifting device that the embodiment of the present application is provided, solves or portion
Divide and solve the inadequate technical problem of protective gas dew-point temperature and dew point precision controlling in prior art, by humidifier
Set up steam and be passed through looped pipeline road, increase the intake of humidifier steam inside；By arranging TEMP on outlet pipe
Device and control unit, to detect and adjust the temperature of protective gas in export pipeline, realize the rapid dew for lifting protective gas
Point temperature, the dew point high-precision control to protective gas meets orientation silicon steel low temperature process high dew point, high-precision control requirement
Technique effect.
This application provides a kind of continuous annealing furnace humidifier protective gas dew point lifting device, humidifier is connected with protection
Gas piping 1, steam is passed through main line 3 and outlet pipe 12；Steam is passed through main line 3 and is connected with vapour source pipeline 2, makes steam
Send into inside humidifier 10；Continuous annealing furnace humidifier protective gas dew point lifting device includes：Steam is passed through looped pipeline road 4, temperature
Degree sensor 11 and control unit 14.
Steam is passed through the one end on looped pipeline road 4 and is connected with vapour source pipeline 2, and the other end is fixedly connected with humidifier 10；Steam
It is passed through looped pipeline road 4 and is provided with two hand-operated valves；Steam is passed through the caliber on looped pipeline road 4 and steam be passed through main line 3 caliber it is identical.
Temperature sensor 11 is arranged on outlet pipe 12, to detect outlet pipe 12 in protective gas temperature, generate
Temperature value.Steam is passed through main line 3 and is provided with flow control valve 6；Steam is passed through main line 3 and is additionally provided with stop valve 5；Flow is adjusted
Section valve 6 is arranged between stop valve 5 and humidifier 10.
Control unit 14 is connected with temperature sensor 11 and flow control valve 6；Control unit 14 receives temperature sensor 11
The temperature value of transmission, generates control instruction after temperature value and set temperature value are compared, send control instruction and adjust to flow
Section valve carries out Flow-rate adjustment.Temperature information generates control instruction after being compared with set temperature value, specifically includes：Work as temperature value
During less than set temperature value, control instruction control flow control valve 6 increases the flow of steam；When temperature value is more than set temperature value
When, control instruction control flow control valve 6 reduces the flow of steam.
Steam is set up on humidifier 10 and is passed through looped pipeline road 4, increase the intake of the steam inside of humidifier 10, can be rapid
Lift the dew-point temperature of protective gas；By arranging temperature sensor on outlet pipe 12, to detect outlet pipe 12 in protect
The temperature of shield gas, and temperature sensor 11 is connected with control unit 14, control unit 14 receives temperature sensor 11 and sends
Temperature value, control instruction is generated after temperature value and set temperature value are compared, by control instruction to flow control valve 6
Flow-rate adjustment is carried out, the dew point high-precision control of protective gas is realized then.
Further, humidifier 10 is connected with spray liquid circulation line 9；Spray liquid circulation line 9 circulates in spray liquid
The inside of humidifier 10.Humidifier 10 is provided with spray system 13；Spray system 13 includes：Shower, delivery pump and shower nozzle；Spray
One end of shower pipe is connected with the bottom of humidifier 10, and the other end is connected with shower nozzle；Shower nozzle is arranged on the top of humidifier 10；Conveying
Pump is arranged on shower, and the spray liquid of the bottom of humidifier 10 is guided on shower nozzle.Wherein, spray liquid is desalted water.
Further, the entry position of protective gas pipeline 1 is passed through main line 3 higher than steam and steam is passed through looped pipeline road 4
Entry position.Outlet pipe 12 stretches into the inside of humidifier 10, and the position of the mouth of pipe is less than the entrance position of protective gas pipeline 1
Put.
The continuous annealing furnace humidifier protective gas dew point of the application offer is provided below by specific embodiment
The operation principle of lifting device：
Spray liquid circulation line 9 and spray system 13 on humidifier 10 is started, it is mixed by nitrogen hydrogen according to technological requirement
A certain proportion of nitrogen hydrogen hybrid protection gas is passed through humidifier 10 by the protective gas pipeline 1 of conjunction, is checked and is confirmed the nothing of humidifier 10
After gas leakage, the slow opening of 7 and second hand-operated valve of first manual valve 8 caliber being passed through for the steam of DN25 on looped pipeline road 4,
The temperature change of the detection of temperature sensor 11 on the outlet pipe 12 of humidifier 10 is observed simultaneously, until the escaping pipe of humidifier 10
The temperature that temperature sensor 11 shows on road 12 less than technological requirement 10 DEG C of set temperature value when, first manual valve 7 and second
The aperture of hand-operated valve 8 is fixed, and opens the stop valve 5 that DN25 steam is passed through on main line 3, while starting flow control valve 6, flow
Regulating valve 6 is adjusted according to the quantity of steam that the temperature value that temperature sensor 11 feeds back is passed through main line 3 to steam, until humidification
The temperature value of the detection of temperature sensor 11 is consistent with the set temperature value of technological requirement on the outlet pipe 12 of device 10, and ±
When fluctuating in 0.5 DEG C, now the dew point of nitrogen hydrogen hybrid protection gas meets technological requirement.
One or more technical schemes provided herein, at least have the following technical effect that or advantage：
Looped pipeline road 4 is passed through as a result of steam is set up on humidifier 10, the logical of the steam inside of humidifier 10 is increased
Enter amount, can rapidly lift the dew-point temperature of protective gas；By arranging temperature sensor 11 on outlet pipe 12, to detect
The temperature of protective gas in air pipe 12, and temperature sensor 11 is connected with control unit 14, control unit 14 receives temperature
The temperature value that sensor 11 sends, generates control instruction, by control instruction after temperature value and set temperature value are compared
Flow-rate adjustment is carried out to flow control valve 6, the dew point high-precision control of protective gas is realized then.So, efficiently solve existing
There is the inadequate technical problem of protective gas dew-point temperature and dew point precision controlling in technology, realize rapid lifting protective gas
Dew-point temperature, the dew point high-precision control to protective gas meets the high dew point of orientation silicon steel low temperature process, high-precision control requirement
Technique effect.
Above-described specific embodiment, is entered to the purpose of this utility model, technical scheme and beneficial effect
One step is described in detail, be should be understood that and be the foregoing is only specific embodiment of the present utility model, is not used to limit
The utility model processed, all within spirit of the present utility model and principle, any modification, equivalent substitution and improvements done etc.,
Should be included within protection domain of the present utility model.
Claims (10)
1. a kind of continuous annealing furnace humidifier protective gas dew point lifting device, the humidifier be connected with protective gas pipeline,
Steam is passed through main line and outlet pipe；The steam is passed through main line and is connected with vapour source pipeline, makes steam send into described adding
Inside wet device；Characterized in that, the continuous annealing furnace humidifier protective gas dew point lifting device includes：
Steam is passed through looped pipeline road, and one end is connected with the vapour source pipeline, and the other end is fixedly connected with the humidifier；
Temperature sensor, is arranged on the outlet pipe, to detect the outlet pipe in protective gas temperature, generate temperature
Angle value；
The steam is passed through main line and is provided with flow control valve；
Control unit, is connected with the temperature sensor and the flow control valve；Described control unit receives the temperature and passes
The temperature value that sensor sends, generates control instruction after the temperature value and set temperature value are compared, send described
Control instruction to the flow control valve carries out Flow-rate adjustment.
2. continuous annealing furnace humidifier protective gas dew point lifting device as claimed in claim 1, it is characterised in that
The humidifier is connected with spray liquid circulation line；
The spray liquid circulation line makes spray liquid circulate in the inside of the humidifier.
3. continuous annealing furnace humidifier protective gas dew point lifting device as claimed in claim 1, it is characterised in that
The humidifier is provided with spray system；The spray system includes：Shower, delivery pump and shower nozzle；
One end of the shower is connected with the bottom of the humidifier, and the other end is connected with the shower nozzle；
The shower nozzle is arranged on the top of the humidifier；
The delivery pump is arranged on the shower, and the spray liquid of the humidifier bottom is guided on the shower nozzle.
4. continuous annealing furnace humidifier protective gas dew point lifting device as claimed in claim 3, it is characterised in that
The spray liquid is desalted water.
5. continuous annealing furnace humidifier protective gas dew point lifting device as claimed in claim 1, it is characterised in that
The steam is passed through main line and is additionally provided with stop valve；
The flow control valve is arranged between the stop valve and the humidifier.
6. continuous annealing furnace humidifier protective gas dew point lifting device as claimed in claim 1, it is characterised in that
The entry position of the protective gas pipeline is passed through main line higher than the steam and the steam is passed through entering for looped pipeline road
Mouth position.
7. continuous annealing furnace humidifier protective gas dew point lifting device as claimed in claim 1, it is characterised in that
The outlet pipe stretches into the inside of the humidifier, and the position of the mouth of pipe is less than the entrance position of the protective gas pipeline
Put.
8. continuous annealing furnace humidifier protective gas dew point lifting device as claimed in claim 1, it is characterised in that
The steam is passed through looped pipeline road and is provided with two hand-operated valves.
9. continuous annealing furnace humidifier protective gas dew point lifting device as claimed in claim 1, it is characterised in that
The caliber that the steam is passed through looped pipeline road is identical with the caliber that the steam is passed through main line.
10. continuous annealing furnace humidifier protective gas dew point lifting device as claimed in claim 1, it is characterised in that described
Temperature information generates control instruction after being compared with set temperature value, including：
When the temperature value is less than the set temperature value, the control instruction controls the flow control valve and increases the steaming
The flow of vapour；
When the temperature value is more than the set temperature value, the control instruction controls the flow control valve and reduces the steaming
The flow of vapour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621202325.9U CN206173406U (en) | 2016-11-07 | 2016-11-07 | Continuous annealing furnace humidifier protective gas dew point hoisting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621202325.9U CN206173406U (en) | 2016-11-07 | 2016-11-07 | Continuous annealing furnace humidifier protective gas dew point hoisting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206173406U true CN206173406U (en) | 2017-05-17 |
Family
ID=58682874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621202325.9U Active CN206173406U (en) | 2016-11-07 | 2016-11-07 | Continuous annealing furnace humidifier protective gas dew point hoisting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206173406U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029527A (en) * | 2022-04-27 | 2022-09-09 | 首钢智新迁安电磁材料有限公司 | Control method for steam dew point of humidifier |
| CN115212997A (en) * | 2022-07-01 | 2022-10-21 | 中国华能集团清洁能源技术研究院有限公司 | Circulating air dew point controllable crushing system and dew point control method |
-
2016
- 2016-11-07 CN CN201621202325.9U patent/CN206173406U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029527A (en) * | 2022-04-27 | 2022-09-09 | 首钢智新迁安电磁材料有限公司 | Control method for steam dew point of humidifier |
| CN115029527B (en) * | 2022-04-27 | 2023-09-19 | 首钢智新迁安电磁材料有限公司 | Control method for steam dew point of humidifier |
| CN115212997A (en) * | 2022-07-01 | 2022-10-21 | 中国华能集团清洁能源技术研究院有限公司 | Circulating air dew point controllable crushing system and dew point control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206173406U (en) | Continuous annealing furnace humidifier protective gas dew point hoisting device | |
| CN104100229B (en) | Method and skid-mounted unit that a kind of utilization well head natural gas is heated | |
| CN104232877B (en) | A kind of strip steel annealing furnace roller roll surface anti-dross device | |
| CN106676251B (en) | A kind of device and method for preventing furnace roller dross in high-strength steel annealing process | |
| TW201544766A (en) | Fluidized bed boiler and method for enhancing operational efficiency of the same | |
| CN112484930B (en) | Method for testing air tightness of blast furnace before blow-in | |
| CN108395113A (en) | Online float glass process coated glass transition roller table SO2Protect gas system and operating method | |
| CN205893331U (en) | Experimental high -temperature annealing furnace distributing device that uses | |
| CN105254107B (en) | A kind of formalin liquid waste treatment system and its processing method | |
| CN108690904B (en) | Stainless steel heat treatment protective gas recycling method | |
| CN208649133U (en) | Online float glass process coated glass transition roller table SO2 protects gas system | |
| CN207990205U (en) | A kind of leaching material steam supply system | |
| CN207512236U (en) | A kind of continuous annealing furnace dew point control device | |
| CN105331925B (en) | A kind of high-precision dynamic vacuum control system for vacuum nitriding | |
| CN206637257U (en) | A kind of automotive catalytic converter tests hot air supplying apparatus | |
| CN115898710A (en) | Non-condensation double-wall pipe liquefied natural gas supply system | |
| CN106517826A (en) | Deuterium treatment device | |
| CN207614638U (en) | A kind of improved loop fluidized-bed combustion boiler lime stone dry type desulfurizing intelligent regulating system | |
| CN208532883U (en) | A kind of metal coil tape high-temperature heat treatment bell furnace | |
| CN207811846U (en) | A kind of stove nose inside nitrogen humidification system | |
| CN207775088U (en) | A kind of device of adjustable sulfur dioxide spray angle | |
| CN205990371U (en) | A kind of device oxygen-enriched to catalytic cracking regenerator supply | |
| CN107186217B (en) | Tungsten powder reduction equipment and control method thereof | |
| CN109722516A (en) | The device and method of gas dew point in a kind of quick regulation annealing furnace | |
| CN205223334U (en) | A high accuracy vacuum developments control system for vacuum nitrogenize |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231008 Address after: No. 025 Zhao'an Street, Qian'an Economic Development Zone, Tangshan City, Hebei Province, 064400 Patentee after: SHOUGANG ZHIXIN QIAN'AN ELECTROMAGNETIC MATERIALS Co.,Ltd. Address before: 100041 No. 68, Shijingshan Road, Beijing, Shijingshan District Patentee before: BEIJING SHOUGANG Co.,Ltd. |