CN203464684U - Feeding mechanism of electric arc furnace - Google Patents
Feeding mechanism of electric arc furnace Download PDFInfo
- Publication number
- CN203464684U CN203464684U CN201320557625.9U CN201320557625U CN203464684U CN 203464684 U CN203464684 U CN 203464684U CN 201320557625 U CN201320557625 U CN 201320557625U CN 203464684 U CN203464684 U CN 203464684U
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- hopper
- electric arc
- track
- valve rod
- arc furnaces
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Abstract
The utility model discloses a feeding mechanism of an electric arc furnace. The feeding mechanism comprises an electric arc furnace feeding hopper, a hopper car and a feeding track device, wherein the electric arc furnace feeding hopper comprises an upper barrel body and a lower barrel body which are connected in an up-down manner, a valve rod is arranged at the axial line of the upper barrel body, and a conical body is connected to the bottom end of the valve rod; the hopper car comprises a car plate body, a wheel shaft and wheels mounted at the left and right ends of the wheel shaft; a blanking through hole is formed in the middle of the car plate body, a supporting barrel is arranged on the upper surface of the car plate body in a manner of surrounding the blanking through hole, and the lower part of the lower barrel body is inserted into the supporting barrel; the feeding track device is positioned above an electric arc furnace feeding hole, and comprises left and right tracks which each comprises a track top plate, a track bottom plate, and a vertical connecting plate connected between the track top plate and the track bottom plate; the wheels are connected to the track top plates in a rolling manner. According to the feeding mechanism, the electric arc furnace feeding hopper can be quickly and accurately moved by the hopper car and the feeding track device to reach a place which cannot be reached by a lifting appliance, so that the feeding efficiency of the electric arc furnace is improved.
Description
Technical field
The utility model relates to refractory material production technical field, especially a kind of electric arc furnaces feeding machanism.
Background technology
In the production process of refractory material, electric arc furnaces feed hopper be a kind of conventional be the equipment of electric arc furnaces feed.It is to move after relying on suspender to sling that existing electric arc furnaces feed hopper is filled when material is rear to be moved, and can not move flexibly on ground.Be subject to the restriction of suspender, the layout of the plant and equipments such as feed bin is also restricted.
As shown in Figure 1 to Figure 3, existing electric arc furnaces feed hopper comprises cylindrical shape upper shell 51, and upper shell 51 is connected with taper type lower shell 52 downwards, and lower shell 52 lower ending openings are as hopper discharging opening 53, and upper shell 51 upper end open are as hopper feed mouth 54; Upper shell 51 upper ends are provided with backstay 55, in backstay 55, be equipped with valve rod 56, valve rod 56 tops protrude upward hopper feed mouth 54 and are provided with suspension ring 58, valve rod 56 bottoms are stretched out hopper discharging opening 53 downwards and are connected with horizontally disposed disc valve plate 57, valve plate 57 diameters are greater than hopper discharging opening 53 diameters, and valve plate 57 and valve rod 56 form outlet valve.
Existing electric arc furnaces feed hopper has following defect:
1. as shown in Figures 2 and 3, because upper shell 51 is cylindrical, therefore when storage in batches, transportation electric arc furnaces feed hopper, between adjacent arc stove feed hopper, only at tangent one, tightly to straight line place, be in contact with one another, the mode of this line contact, on the one hand each other frictional force little, easily make adjacent arc stove feed hopper that mutual displacement occur, also each electric arc furnaces feed hopper initial arrangement has neatly been brought to difficulty, while there is generating collision in transit on the other hand, the line place being in contact with one another concentrates stressed, easily deforms, damages.
2. if upper shell 51 is thinner, can reduce manufacturing cost because saving material, but can bring simultaneously hopper intensity less, hold flimsy defect.If overcome the defect that hopper intensity is less, traditional way can only increase cylindrical shell wall thickness again, thereby greatly increases manufacturing cost.There is no at present to promote hopper intensity, exceed the method that increases manufacturing cost again.
3. when opening valve discharging, on horizontally disposed valve plate 57, can pile up many materials, cause the incomplete phenomenon of discharging.
4. when reinforced and storing, valve plate 57 contacts defective tightness with the lower shell 52 at discharging opening 53 places, there will be the phenomenon of material from leakage.
5. when discharging, occur sometimes that material is gathered in hopper, the not smooth phenomenon of blanking.Material is especially easy to unite, pile up in feed hopper bottom.
At present, refractory material production field lacks moving electric arc stove feed hopper, reinforced electric arc furnaces feeding machanism easily flexibly.
Utility model content
The purpose of this utility model is to provide a kind of electric arc furnaces feeding machanism.
For achieving the above object, electric arc furnaces feeding machanism of the present utility model comprises electric arc furnaces feed hopper, hopper dolly and feeding orbit device; Electric arc furnaces feed hopper comprises cylindrical shape upper shell, and upper shell is connected with up big and down small taper type lower shell downwards, and lower shell lower ending opening is as hopper discharging opening, and upper shell upper end open is as hopper feed mouth, and upper shell and lower shell form the cylindrical shell of hopper; Upper shell upper end level is provided with cross backstay group, and upper shell lower horizontal is provided with cross bracing piece group; Upper shell axis place is provided with valve rod, valve rod is through described backstay group and bracing piece group, valve stem tip protrudes upward hopper feed mouth, valve rod bottom is stretched out hopper discharging opening downwards and is connected with most advanced and sophisticated cone upward, cone bottom surface diameter is greater than hopper discharging opening diameter, and cone and valve rod form outlet valve; Described cone side is provided with rubber application of anti-leakage layers, and the bottom of described taper type lower shell is the ring-type frustum face suitable with described rubber application of anti-leakage layers; Valve rod in described hopper cylindrical shell is provided with two above rod for stiring materials, and each rod for stiring materials is along valve rod between the upper and lower every setting; Hopper dolly comprises horizontally disposed sweep body, and sweep body is connected with wheel shaft downwards; The moving direction of hopper dolly of take is forward direction, and the two ends, left and right of wheel shaft are stretched out the limit, the left and right sides of sweep body and by bearing, are connected with wheel respectively; The middle part of sweep body is provided with blanking through hole, on sweep body upper surface, around blanking through hole, be provided with up big and down small taper type support tube, the inner surface of support tube and described lower shell outer surface are suitable, and the upper end diameter of support tube is greater than the lower end diameter of lower shell and is less than the upper end diameter of lower shell; Described lower shell bottom plugs also support and connection in described support tube; Described wheel is provided with limiting block platform near a side radial protrusion of sweep body; The wheel that install at described wheel shaft and its two ends forms walking mechanism, and described walking mechanism is arranged with two covers at the front and rear of described sweep body; Feeding orbit device is positioned at electric arc furnaces charging aperture top, comprise the parallel left track being arranged side by side and right track, the structure of left and right track is identical, and the two is by track top board, sole-plate and be connected to the vertical connecting plate composition between track top board and sole-plate; Between the vertical connecting plate of left and right track, be connected with horizontal connecting plate, horizontal connecting plate is interval with a plurality of on the length direction of left and right track; Described wheel rolling is connected on track top board, and the limiting block platform of described wheel is limited in the inner side of track top board by described track top board.
Described lower shell outer surface is fixedly connected with vibrating motor; Described upper shell is interval with the horizontally disposed cannelure of twice up and down, and in twice cannelure, tight fit is provided with rubber slab respectively, and the outward flange of rubber slab protrudes cannelure and is square; Described valve rod top is provided with suspension ring.
The surface of described rubber slab is provided with corrugated or latticed anti-slip veins; Described valve rod welded top has horizontally disposed shaft-like handle; Described rod for stiring materials is interval with 4 up and down along described valve rod.
The outer surface of described support tube is along being circumferentially evenly provided with 4 stiffeners, and stiffener is connected between support tube and sweep body.
Electric arc furnaces feeding machanism of the present utility model can utilize feeding orbit device, hopper dolly and electric arc furnaces feed hopper conveniently, accurately material to be transported to electric arc furnaces charging aperture top and to electric arc furnaces feed, make up the deficiency of using suspender handling electric arc furnaces feed hopper.
The hopper dolly that is loaded with electric arc furnaces feed hopper in the utility model can move down from track, in factory building, utilize wheel to move easily and flexibly, can promote the utility model and arrive the place that suspender cannot arrive, greatly improve the flexibility of electric arc furnaces feed hopper feed and discharging, also improved the flexibility that in factory building, various device is arranged.The structure of electric arc furnaces feed hopper in the utility model, can avoid the phenomenon that discharging is in the past incomplete and the front material appearance of discharging is leaked simultaneously, can break up again material, makes the smooth and easy outflow of material when gathering, stopping up at material.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing electric arc furnaces feed hopper;
Fig. 2 is the top view of Fig. 1;
Existing a plurality of electric arc furnaces feed hopper schematic top plan view arranged together when Fig. 3 is storage in batches or transportation.
Fig. 4 is the plan structure schematic diagram of electric arc furnaces feed hopper;
Fig. 5 is the A-A cutaway view of Fig. 4;
Fig. 6 is the enlarged drawing at A place in Fig. 5;
Fig. 7 is the structural representation of rubber slab;
A plurality of electric arc furnaces feed hopper schematic top plan view arranged together when Fig. 8 is storage in batches or transportation;
Fig. 9 is out the structural representation of electric arc furnaces feed hopper under valve state;
Figure 10 is structural representation of the present utility model;
Figure 11 is the top view of Figure 10;
Figure 12 is the left view that hopper dolly matches with track;
Figure 13 is the enlarged drawing at B place in Figure 10.
The specific embodiment
In Figure 12, the direction of arrow is the direction of motion of hopper dolly.
As shown in Fig. 4 to Figure 12, electric arc furnaces feeding machanism of the present utility model comprises electric arc furnaces feed hopper, hopper dolly and feeding orbit device.
Electric arc furnaces feed hopper comprises cylindrical shape upper shell 1, upper shell 1 is connected with up big and down small taper type lower shell 2 downwards, lower shell 2 lower ending openings are as hopper discharging opening 3, and upper shell 1 upper end open is as hopper feed mouth 4, and upper shell 1 and lower shell 2 form the cylindrical shell of hopper.
As shown in Fig. 4 to Fig. 9, upper shell 1 upper end level is provided with cross backstay group 5, and upper shell 1 lower horizontal is provided with cross bracing piece group 6; Upper shell 1 axis place is provided with valve rod 7, valve rod 7 is through described backstay group 5 and bracing piece group 6, valve rod 7 tops protrude upward hopper feed mouth 4, valve rod 7 bottoms are stretched out hopper discharging opening 3 downwards and are connected with most advanced and sophisticated cone 8 upward, cone 8 bottom surface diameters are greater than hopper discharging opening 3 diameters, and cone 8 and valve rod 7 form outlet valve; As shown in Figure 5 and Figure 6, described cone 8 sides are provided with rubber application of anti-leakage layers 9, and the bottom 21 of described taper type lower shell 2 is the ring-type frustum face suitable with described rubber application of anti-leakage layers 9; Valve rod 7 in described hopper cylindrical shell is provided with two above rod for stiring materials 10, and each rod for stiring materials 10 is along valve rod 7 between the upper and lower every setting, preferably along described valve rod 7 between the upper and lower every 4 rod for stiring materials 10 are set.
As shown in Figure 10-Figure 12, hopper dolly comprises horizontally disposed sweep body 22, and sweep body 22 is connected with wheel shaft 23 downwards; The moving direction of hopper dolly of take is forward direction, and the two ends, left and right of wheel shaft 23 are stretched out the limit, the left and right sides of sweep body 22 and by bearing 24, are connected with wheel 25 respectively; The middle part of sweep body 22 is provided with blanking through hole 26, on sweep body 22 upper surfaces, around blanking through hole 26, be provided with up big and down small taper type support tube 27, the outer surface of the inner surface of support tube 27 and described lower shell 2 is suitable, and the upper end diameter of support tube 27 is greater than the lower end diameter of lower shell 2 and is less than the upper end diameter of lower shell 2; The bottom of described lower shell 2 plugs also support and connection in described support tube 27.The lower end diameter of described cone 8 is less than the diameter of blanking through hole 26.Described wheel 25 is provided with limiting block platform 31 near a side radial protrusion of sweep body 22.
The wheel 25 that install at described wheel shaft 23 and its two ends forms walking mechanism, and described walking mechanism is arranged with two covers at the front and rear of described sweep body 22.
As shown in Figure 10 to Figure 13, feeding orbit device is positioned at electric arc furnaces charging aperture top, comprise the parallel left track 32 being arranged side by side and right track 33, the structure of left and right track 32,33 is identical, the two by track top board 34, sole-plate 36 and be connected to track top board 34 and sole-plate 36 between vertical connecting plate 35 form; Between the vertical connecting plate 35 of left and right track 32,33, be connected with horizontal connecting plate 37, horizontal connecting plate 37 is interval with a plurality of (preferably more than 5) on the length direction of left and right track 32,33, and all preferably by I-steel, is made.
Described wheel 25 rolls and is connected on track top board 34, and the limiting block platform 31 of described wheel is limited in the inner side of track top board 34 by described track top board 34.
The outer surface of described support tube 27 is along being circumferentially evenly provided with 4 stiffeners 29, and stiffener 29 is connected between support tube 27 and sweep body 22.
As shown in Figure 5 and Figure 6, described cone 8 can be both hollow cone, can be also filled circles cone.
As shown in Fig. 5 and Fig. 7, described lower shell 2 outer surfaces are fixedly connected with vibrating motor 11.Described upper shell 1 is interval with the horizontally disposed cannelure 12 of twice up and down, and the interior tight fit respectively of twice cannelure 12 is provided with rubber slab 13, and the outward flange of rubber slab 13 protrudes cannelure 12 and is square.
As shown in Fig. 4 to Fig. 9, described valve rod 7 tops are provided with suspension ring 14, thus both the suspension hook of suspender easy to use hook suspension ring 14 sling in the utility model electric arc furnaces feed hopper, convenient operation personnel grip suspension ring 14 with hand and operate again.
The surface of described rubber slab 13 is provided with corrugated or latticed anti-slip veins (not shown), and anti-slip veins also can be set to other tiny anti-skidding lines such as decorative pattern shape certainly.
As shown in Fig. 4 to Fig. 9, described valve rod 7 welded top have horizontally disposed shaft-like handle 15.While there is material accumulation phenomena in hopper, the two ends that operating personnel can grasp shaft-like handle 15 rotate shaft-like handle 15 or up and down reciprocatingly twitch, thereby drive each rod for stiring materials 10 to rotate in hopper cylindrical shell or move up and down, by the material scattering gathering, material can be swimmingly discharged from discharging opening 3.
The surface contacting with discharging opening 3 due to described cone 8 is inclined plane, therefore open after valve, material can be at the surface sediment of cone 8, and can flow downward along cone 8 sides, so just avoided using in the past solid accumulation that the horizontal valve plate 57 shown in Fig. 1 brings on valve plate, the incomplete phenomenon of discharging.
During electric arc furnaces feed hopper in the utility model of bulk transport or storage, as shown in Figure 8, the contact site of adjacent arc stove feed hopper is the side of rubber slab 13.Because rubber slab 13 outlines (being the outward flange of described rubber slab) are square, thus each electric arc furnaces feed hopper can be easily neat, be closely aligned together, be highly susceptible to arranging.Contact site due to adjacent arc stove feed hopper is the side of rubber slab 13 in addition, therefore the mode of comparing hopper cylindrical shell (existing hopper cylindrical shell is all metal cylinder) line contact has in the past strengthened frictional force greatly, when transporting or depositing, between electric arc furnaces feed hopper, be difficult for, because of the effect of external force, mutual displacement occurs.While there is generating collision in transit, rubber slab 13 sides that are in contact with one another are stressed place.The stressed line place being in the past in contact with one another of comparing, side is concentrated stressed, puts suffered pressure less at stressed identical situation lower stress; Add the intrinsic cushioning effect of rubber slab 13, the cylindrical shell of electric arc furnaces feed hopper can access good protection in transit, can not deform, damage.
Before using the utility model charging and feeding in raw material to electric arc furnaces, rubber slab 13 can be taken off from upper shell 1, can certainly not take off.
While the utility model being installed in factory building, make one end of feeding orbit device be positioned at the top of electric arc furnaces charging aperture, the other end is positioned at the below of feed bin discharge hole.Hopper dolly is placed on left and right track 32,33, the lower shell of electric arc furnaces feed hopper 2 is inserted to support tube 27.
During work, can between shaft-like handle 15 and cross backstay group 5, pack leakproof piece 28 into, leakproof piece 28 can support cross backstay group 5, prevents from that valve rod 7 and cone 8 from moving downward to cause material from leakage.Install after leakproof piece 28, the hopper dolly that is loaded with electric arc furnaces feed hopper in the utility model is delivered to feed bin place along feeding orbit device to connect material, compare and must use suspender handling to compare in the past, mobile efficiency and the precision of electric arc furnaces feed hopper have been improved, and make the layout of feed bin in factory building needn't consider again the scope that suspender can arrive, also strengthen the flexibility that in factory building, facility is arranged, thereby brought great convenience to user.Hopper cylindrical shell relies on self gravitation to be pressed in the rubber application of anti-leakage layers 9 of described cone 8 surface settings.Because rubber has elasticity, thus hopper cylindrical shell press after its lower end can fall into into rubber application of anti-leakage layers 9, thereby realize good sealing effectiveness, avoid feeding in raw material, the phenomenon of material from leakage during storing in the past.
Electric arc furnaces feed hopper in the utility model fills after material, the hopper dolly that is loaded with electric arc furnaces feed hopper is delivered to the top of electric arc furnaces charging aperture along feeding orbit device, take off leakproof piece 28, now under the effect of material gravity, described cone 8 pressurizeds move down, thereby realize, open valve events, material flows out along discharging opening 3, after blanking through hole 26, falls into electric arc furnaces.
If there is material accumulation phenomena when reinforced, can Vibration on Start-up motor 11, can also rotate shaft-like handle 15 by hand or up and down reciprocatingly twitch bar handle 15.At effect of vibration, rod for stiring materials 10 rotation material toggling effects and rod for stiring materials 10, up and down reciprocatingly stir under the effect of material, the material that gathers in cylindrical shell is spread out, and realizes discharging swimmingly.
In a word, electric arc furnaces feeding machanism of the present utility model can in factory building, utilize hopper dolly and feeding orbit device rapidly, moving electric arc stove feed hopper accurately, need not move at every turn and all use suspender, and can promote hopper dolly of the present utility model and arrive the place that suspender cannot arrive, greatly improved the feed efficiency of electric arc furnaces, improve the flexibility of electric arc furnaces feed hopper feed and discharging, also improved the flexibility that in factory building, various device is arranged.
In addition, electric arc furnaces feeding machanism of the present utility model is compared in tube structure in the past cost-saving in strengthening, is storing or is being convenient to marshalling during transportation electric arc furnaces feed hopper, and can prevent that hopper cylindrical shell is out of shape, damages because of carriage oscillating.The utility model can also be avoided the phenomenon that discharging is in the past incomplete and the front material appearance of discharging is leaked, and can break up again material, makes the smooth and easy outflow of material when material gathers.
Above embodiment is the unrestricted the technical solution of the utility model in order to explanation only, although the utility model is had been described in detail with reference to above-described embodiment, those of ordinary skill in the art is to be understood that: still can modify or be equal to replacement the utility model, and not departing from any modification or partial replacement of spirit and scope of the present utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (4)
1. electric arc furnaces feeding machanism, is characterized in that: comprise electric arc furnaces feed hopper, hopper dolly and feeding orbit device;
Electric arc furnaces feed hopper comprises cylindrical shape upper shell, and upper shell is connected with up big and down small taper type lower shell downwards, and lower shell lower ending opening is as hopper discharging opening, and upper shell upper end open is as hopper feed mouth, and upper shell and lower shell form the cylindrical shell of hopper;
Upper shell upper end level is provided with cross backstay group, and upper shell lower horizontal is provided with cross bracing piece group; Upper shell axis place is provided with valve rod, valve rod is through described backstay group and bracing piece group, valve stem tip protrudes upward hopper feed mouth, valve rod bottom is stretched out hopper discharging opening downwards and is connected with most advanced and sophisticated cone upward, cone bottom surface diameter is greater than hopper discharging opening diameter, and cone and valve rod form outlet valve; Described cone side is provided with rubber application of anti-leakage layers, and the bottom of described taper type lower shell is the ring-type frustum face suitable with described rubber application of anti-leakage layers; Valve rod in described hopper cylindrical shell is provided with two above rod for stiring materials, and each rod for stiring materials is along valve rod between the upper and lower every setting;
Hopper dolly comprises horizontally disposed sweep body, and sweep body is connected with wheel shaft downwards; The moving direction of hopper dolly of take is forward direction, and the two ends, left and right of wheel shaft are stretched out the limit, the left and right sides of sweep body and by bearing, are connected with wheel respectively; The middle part of sweep body is provided with blanking through hole, on sweep body upper surface, around blanking through hole, be provided with up big and down small taper type support tube, the inner surface of support tube and described lower shell outer surface are suitable, and the upper end diameter of support tube is greater than the lower end diameter of lower shell and is less than the upper end diameter of lower shell; Described lower shell bottom plugs also support and connection in described support tube; Described wheel is provided with limiting block platform near a side radial protrusion of sweep body; The wheel that install at described wheel shaft and its two ends forms walking mechanism, and described walking mechanism is arranged with two covers at the front and rear of described sweep body;
Feeding orbit device is positioned at electric arc furnaces charging aperture top, comprise the parallel left track being arranged side by side and right track, the structure of left and right track is identical, and the two is by track top board, sole-plate and be connected to the vertical connecting plate composition between track top board and sole-plate; Between the vertical connecting plate of left and right track, be connected with horizontal connecting plate, horizontal connecting plate is interval with a plurality of on the length direction of left and right track;
Described wheel rolling is connected on track top board, and the limiting block platform of described wheel is limited in the inner side of track top board by described track top board.
2. electric arc furnaces feeding machanism according to claim 1, is characterized in that: described lower shell outer surface is fixedly connected with vibrating motor; Described upper shell is interval with the horizontally disposed cannelure of twice up and down, and in twice cannelure, tight fit is provided with rubber slab respectively, and the outward flange of rubber slab protrudes cannelure and is square; Described valve rod top is provided with suspension ring.
3. electric arc furnaces feeding machanism according to claim 2, is characterized in that: the surface of described rubber slab is provided with corrugated or latticed anti-slip veins; Described valve rod welded top has horizontally disposed shaft-like handle; Described rod for stiring materials is interval with 4 up and down along described valve rod.
4. according to the electric arc furnaces feeding machanism described in any one in claims 1 to 3, it is characterized in that: the outer surface of described support tube is along being circumferentially evenly provided with 4 stiffeners, and stiffener is connected between support tube and sweep body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320557625.9U CN203464684U (en) | 2013-09-10 | 2013-09-10 | Feeding mechanism of electric arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320557625.9U CN203464684U (en) | 2013-09-10 | 2013-09-10 | Feeding mechanism of electric arc furnace |
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| Publication Number | Publication Date |
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| CN203464684U true CN203464684U (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320557625.9U Expired - Fee Related CN203464684U (en) | 2013-09-10 | 2013-09-10 | Feeding mechanism of electric arc furnace |
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| Country | Link |
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| CN (1) | CN203464684U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109453839A (en) * | 2018-12-13 | 2019-03-12 | 邬志明 | Granular material discharged opening and closing operations mechanism and rolling rice sell a meter all-in-one machine |
| CN113528746A (en) * | 2021-06-29 | 2021-10-22 | 曹明贵 | Furnace mouth sealing device for electric arc furnace preheating furnace |
-
2013
- 2013-09-10 CN CN201320557625.9U patent/CN203464684U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109453839A (en) * | 2018-12-13 | 2019-03-12 | 邬志明 | Granular material discharged opening and closing operations mechanism and rolling rice sell a meter all-in-one machine |
| CN109453839B (en) * | 2018-12-13 | 2024-05-24 | 邬志明 | Particulate matter emission opening and closing operating mechanism and rice milling and selling integrated machine |
| CN113528746A (en) * | 2021-06-29 | 2021-10-22 | 曹明贵 | Furnace mouth sealing device for electric arc furnace preheating furnace |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140305 Termination date: 20140910 |
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| EXPY | Termination of patent right or utility model |