CN206109486U - Box -type heating furnace - Google Patents
Box -type heating furnace Download PDFInfo
- Publication number
- CN206109486U CN206109486U CN201621028474.8U CN201621028474U CN206109486U CN 206109486 U CN206109486 U CN 206109486U CN 201621028474 U CN201621028474 U CN 201621028474U CN 206109486 U CN206109486 U CN 206109486U
- Authority
- CN
- China
- Prior art keywords
- wall
- furnace
- furnace shell
- hand member
- fire door
- 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.)
- Expired - Fee Related
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims description 26
- 239000011449 brick Substances 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 239000003973 paint Substances 0.000 claims description 10
- 244000025254 Cannabis sativa Species 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 244000239635 ulla Species 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 7
- 239000003345 natural gas Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 230000037452 priming Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 1
- 230000008450 motivation Effects 0.000 claims 1
- 238000010304 firing Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model discloses a firing equipment technical field's a box -type heating furnace, including the stove outer covering, the outer wall of stove outer covering is provided with the steel sheet, the inner wall of steel sheet evenly is provided with H shaped steel board, the mouth of pipe has all been offered to the zuo bi and the right wall of stove outer covering, orificial outer wall is provided with flange, the inner chamber of stove outer covering is provided with the furnace wall, be provided with anchor assembly between furnace wall and the stove outer covering, the utility model discloses an outer wall of stove outer covering is provided with the steel sheet, the inner wall of steel sheet evenly is provided with H shaped steel board, the temperature of stove outer covering that had not only increased structural strength but also great reduction, left end and right -hand member through the furnace gate all are provided with furnace gate hoisting device, furnace gate hoisting device includes longmen frame, the top of longmen frame is provided with the CD -ROM drive motor, the right -hand member of CD -ROM drive motor is provided with the sprocket, the outer wall of sprocket is provided with the driving chain, the bottom of driving chain and the outer wall fixed connection of furnace gate, make the furnace gate electronicly as required open and to close, the trouble of manpower has been saved.
Description
Technical field
This utility model is related to firing equipment technical field, specially a kind of box type heater.
Background technology
In the production process of the alloy products such as steel plate, tun end socket, heat treatment step is all requisite pass
Key step, it is very big to the performance impact of product, at present in heat treatment, frequently with firing equipment be box type heater, at present
Box type heater have the drawback that in-furnace temperature is uneven, upper relative superiority or inferiority is low, therefore in heated partses, and heating-up temperature is uneven
It is even, such as want to make the heating-up temperature of heated partses such as steel plate reach uniformity in production, it is necessary to extend heat time heating time and guarantor
The warm time, the energy is so not only wasted, increase production cost, and also reduce production efficiency, deficiency in economic performance, such as China
A kind of box type heater of number of patent application 201220576335.4, including the furnace wall of both sides, are respectively arranged with the furnace wall of both sides
At least two row's burners, box type heater is respectively provided with least two row's burners on the furnace wall of both sides, is capable of achieving a thermal current left side and blows
Left bank is blown on right row, the right side, and blow bottom right row for upper left, and upper right blows lower-left row, and the range of movement of box type heater inside thermal current is big, box
Heating furnace top heat is walked downwards so as to realize that up and down the uniform, temperature difference is obviously reduced furnace temperature, the box type heater that the product is provided
Furnace temperature is not good, and heating-up temperature is uneven, and based on this, this utility model devises a kind of box type heater, to solve above-mentioned asking
Topic.
Utility model content
The purpose of this utility model is to provide a kind of box type heater, to solve above-mentioned background technology in propose it is current
Box type heater have the drawback that in-furnace temperature is uneven, upper relative superiority or inferiority is low, therefore in heated partses, and heating-up temperature is uneven
It is even, such as want to make the heating-up temperature of heated partses such as steel plate reach uniformity in production, it is necessary to extend heat time heating time and guarantor
The warm time, the energy is so not only wasted, increase production cost, and also reduce production efficiency, the problem of deficiency in economic performance.
For achieving the above object, this utility model provides following technical scheme：A kind of box type heater, including furnace shell, institute
The outer wall for stating furnace shell is provided with steel plate, and the inwall of the steel plate is evenly arranged with H profile steel plate, and the left wall and right wall of the furnace shell is equal
The mouth of pipe is offered, the outer wall of the mouth of pipe is provided with adpting flange, and the inner chamber of the furnace shell is provided with furnace lining, the furnace lining and stove
Anchoring piece is provided between shell, the furnace shell and furnace lining are connected by anchoring piece, and the intracavity bottom of the furnace shell is provided with bearing material
Furnace bottom, the top of the bearing material furnace bottom uniformly offers airflow hole, and the inner chamber of the bearing material furnace bottom is provided with guide rail, the guide rail
Bottom be provided with high-alumina brick and impervious carbon brick, the outer wall middle setting of the furnace shell has fire door, and the fire door includes fire door steel
Plate, the outer wall of the fire door steel plate is evenly arranged with ulla grass section bar, and the left end and right-hand member of the fire door are provided with furnacing door lifting
Device, the furnace door lifting device includes gantry frame, and drive motor, the driving horse are provided with the top of the gantry frame
The right-hand member for reaching is provided with sprocket wheel, and the outer wall of the sprocket wheel is provided with driving-chain, and the bottom of the driving-chain is consolidated with the outer wall of fire door
Fixed connection, is provided with oven door sealing hold down gag at the top of the fire door, the inner chamber of the oven door sealing hold down gag is provided with
Multiple spot pneumatic clamping mechanism, the inner chamber of the furnace lining is provided with natural gas heating system, and the natural gas heating system includes eight
Group is from preheating burner, and the outer wall from preheating burner is provided with automatic ignition and control system, described from the defeated of preheating burner
Gas end connecting gas transmission pipe road, is provided with high pressure combustion fan at the top of the gas pipeline, the high pressure combustion fan is arranged on
The top of furnace shell, the outer wall of the high pressure combustion fan is provided with sound proof box, and the outer wall of the sound proof box is provided with protective cover, institute
The outer wall for stating furnace shell is plugged with thermocouple, and the thermocouple is plugged on the inner chamber of furnace lining.
Preferably, the outer wall of the furnace shell scribbles resistant to elevated temperatures priming paint and finish paint, and the furnace shell outer wall is provided with thermometer hole
And peep-hole.
Preferably, ceramic fiber blanket and module are provided between the ulla grass section bar, the guide rail falls to beat and pours for high intensity
Form shaped brick.
Preferably, the high pressure combustion fan includes motor, and the right-hand member of the motor is provided with bearing cap, the axle
The right-hand member for holding lid is provided with left sound insulation lid, and the right-hand member of the left sound insulation lid is arranged on the left end of sound proof box, the right side of the sound proof box
End is provided with right sound insulation lid, and the right-hand member of the right sound insulation lid is provided with wind sucting tube, and the outer wall of the sound proof box is provided with air-out method
It is blue.
Compared with prior art, the beneficial effects of the utility model are：This utility model is provided with by the outer wall of furnace shell
Steel plate, the inwall of steel plate is evenly arranged with H profile steel plate, not only increased structural strength but also the temperature of furnace shell greatly reduces, and leads to
The left end and right-hand member for crossing fire door is provided with furnace door lifting device, and furnace door lifting device includes gantry frame, the top of gantry frame
Portion is provided with drive motor, and the right-hand member of drive motor is provided with sprocket wheel, and the outer wall of sprocket wheel is provided with driving-chain, the bottom of driving-chain
It is fixedly connected with the outer wall of fire door, allows fire door electronic opening and closing as needed, the trouble of manpower is eliminated, by stove
The top of door is provided with oven door sealing hold down gag, and the inner chamber of oven door sealing hold down gag is provided with multiple spot pneumatic clamping mechanism,
Multiple spot pneumatic clamping mechanism compresses fire door when closing fire door, it is ensured that seal, improves the efficiency of heating, by certainly
The setting of preheating burner and high pressure combustion fan, increased efficiency of combustion, allow heating furnace to be heated to the temperature for needing, and pass through
The outer wall of high pressure combustion fan is provided with sound proof box, and the outer wall of the sound proof box is provided with protective cover, makes the high pressure for running up
Combustion fan can effectively reduce noise, and protective cover increased the safety of high pressure combustion fan, be applied by the outer wall of furnace shell
There are resistant to elevated temperatures priming paint and finish paint, when making furnace shell reach a high temperature, paint will not melt, corrosion resistance is improved, by furnace shell outer wall
Thermometer hole and peep-hole are provided with, operator can be made to monitor the combustion case in stove at any time, by setting between ulla grass section bar
Ceramic fiber blanket and module are equipped with, allow fire door to bear high temperature and indeformable, be that high intensity falls to beat moulding by casting by guide rail
Brick, the guide rail fire resisting in high temperature, the temperature conditionss in stove can be monitored by thermocouple.
Description of the drawings
Fig. 1 is this utility model structural representation；
Fig. 2 is this utility model door structure schematic diagram；
Fig. 3 is this utility model structure right view schematic diagram；
Fig. 4 is this utility model structure part A schematic diagram；
Fig. 5 is this utility model structure part B schematic diagram；
Fig. 6 is this utility model structure C partial schematic diagram；
Fig. 7 is this utility model high pressure combustion fan structural representation.
In figure：1 furnace shell, 111 steel plates, 112H shape steel plates, 113 mouths of pipe, 114 adpting flanges, 2 furnace linings, 21 anchoring pieces, 3 are held
Material furnace bottom, 31 airflow holes, 32 guide rails, 33 high-alumina bricks, 34 impervious carbon bricks, 4 fire doors, 41 fire door steel plates, 42 ulla grass section bars, 5 fire doors
Lifting device, 51 gantry frames, 52 drive motors, 53 sprocket wheels, 54 driving-chains, 6 oven door sealing hold down gags, 61 multiple spot Pneumatic pressures
Tight mechanism, 7 natural gas heating systems, 71 help from preheating burner, 72 automatic ignitions and control system, 73 gas pipelines, 74 high pressure
Combustion blower fan, 741 sound proof boxs, 742 protective covers, 743 left sound insulation lids, 744 right sound insulation lids, 745 wind sucting tubes, 746 bearing caps, 747 go out
Wind flange, 748 motor, 8 thermocouples.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of this utility model protection.
Fig. 1-7 are referred to, this utility model provides a kind of technical scheme：A kind of box type heater, including furnace shell 1, it is described
The outer wall of furnace shell 1 is provided with steel plate 111, and the inwall of the steel plate 111 is evenly arranged with H profile steel plate 112, a left side for the furnace shell 1
Wall and right wall offer the mouth of pipe 113, and the outer wall of the mouth of pipe 113 is provided with adpting flange 114, and the inner chamber of the furnace shell 1 sets
Furnace lining 2 is equipped with, anchoring piece 21 is provided between the furnace lining 2 and furnace shell 1, the furnace shell 1 and furnace lining 2 are connected by anchoring piece 21
Connect, the intracavity bottom of the furnace shell 1 is provided with bearing material furnace bottom 3, and the top of the bearing material furnace bottom 3 uniformly offers airflow hole 31,
The inner chamber of the bearing material furnace bottom 3 is provided with guide rail 32, and the bottom of the guide rail 32 is provided with high-alumina brick 33 and impervious carbon brick 34, institute
Stating the outer wall middle setting of furnace shell 1 has fire door 4, and the fire door 4 includes fire door steel plate 41, and the outer wall of the fire door steel plate 41 is uniform
Ulla grass section bar 42 is provided with, the left end and right-hand member of the fire door 4 are provided with furnace door lifting device 5, the furnace door lifting device 5
Including gantry frame 51, the top of the gantry frame 51 is provided with drive motor 52, and the right-hand member of the drive motor 52 is arranged
The outer wall for having sprocket wheel 53, the sprocket wheel 53 is provided with driving-chain 54, and the bottom of the driving-chain 54 is fixed with the outer wall of fire door 4 and connected
Connect, the top of the fire door 4 is provided with oven door sealing hold down gag 6, the inner chamber of the oven door sealing hold down gag 6 is provided with many
Point pneumatic clamping mechanism 61, the inner chamber of the furnace lining 2 is provided with natural gas heating system 7, and the natural gas heating system 7 includes
Eight groups preheat burner 71 certainly, and the outer wall from preheating burner 71 is provided with automatic ignition and control system 72, described from preheating
The gas transmission end connecting gas transmission pipe road 73 of burner 71, the top of the gas pipeline 73 is provided with high pressure combustion fan 74, the height
Pressure combustion fan 74 is arranged on the top of furnace shell 1, and the outer wall of the high pressure combustion fan 74 is provided with sound proof box 741, it is described every
The outer wall of audio amplifier 741 is provided with protective cover 742, and the outer wall of the furnace shell 1 is plugged with thermocouple 8, and the thermocouple 8 is plugged on stove
The inner chamber of lining 2.
Wherein, the outer wall of the furnace shell 1 scribbles resistant to elevated temperatures priming paint and finish paint, and the outer wall of the furnace shell 1 is provided with thermometer hole
And peep-hole, when making furnace shell 1 reach a high temperature, paint will not melt, and improve corrosion resistance, operator can by thermometer hole and
Peep-hole monitors at any time the combustion case in stove, and ceramic fiber blanket and module are provided between the ulla grass section bar 42, described to lead
Rail 32 is that high intensity falls to beat and pour into shaped brick, allows fire door 4 to bear high temperature and indeformable, is that high intensity is beaten by guide rail 32
Shaped brick is poured into, guide rail 32 can be with fire resisting in high temperature, and the high pressure combustion fan 74 includes motor 748, the motor
748 right-hand member is provided with bearing cap 746, and the right-hand member of the bearing cap 746 is provided with left sound insulation lid 743, the left sound insulation lid 743
Right-hand member be arranged on the left end of sound proof box 741, the right-hand member of the sound proof box 741 is provided with right sound insulation lid 744, the right sound insulation lid
744 right-hand member is provided with wind sucting tube 745, and the outer wall of the sound proof box 741 is provided with outlet air flange 747, by high pressure combustion air
The outer wall of machine 74 is provided with sound proof box 741, and the outer wall of the sound proof box 741 is provided with protective cover 742, makes the high pressure for running up
Combustion fan 74 can effectively reduce noise, and protective cover 742 increased the safety of high pressure combustion fan 74.
Operation principle：This utility model is provided with drive motor 52 by the top of gantry frame 51, drive motor 52
Right-hand member is provided with sprocket wheel 53, and the outer wall of sprocket wheel 53 is provided with driving-chain 54, and the bottom of driving-chain 54 is fixed with the outer wall of fire door 4 and connected
Connect, drive motor 52 is rotated with movable sprocket 53, sprocket wheel 53 drives driving-chain 54 to rotate, driving-chain 54 pulls fire door 4 to carry out
Lower movement, is pushed at fire door 4 by the multiple spot pneumatic clamping mechanism 61 in the seal pressing device 6 of fire door 4, when closing fire door 4
Multiple spot pneumatic clamping mechanism 61 can compress fire door 4, it is ensured that seal, by high pressure combustion fan 74 by air and gas injection
Enter gas pipeline 73, mixed gas are carried out by spraying into toward in stove from preheating burner 71 by automatic ignition and control system 72
Igniting and control burning, by the outer wall of furnace shell 1 thermometer hole and peep-hole are provided with, and operator can be made to monitor at any time in stove
Combustion case, by being provided with ceramic fiber blanket and module between ulla grass section bar 42, allows fire door 4 to bear high temperature and constant
Shape, is beaten for high intensity by guide rail 32 and pours into shaped brick, and in high temperature, there is guide rail 32 very high fire resistance to ensure work
Make, the temperature conditionss in stove can be monitored by thermocouple 8.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out various changes in the case of without departing from principle of the present utility model and spirit, repaiies
Change, replace and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.
Claims (4)
1. a kind of box type heater, including furnace shell (1), it is characterised in that：The outer wall of the furnace shell (1) is provided with steel plate (111),
The inwall of the steel plate (111) is evenly arranged with H profile steel plate (112), and the left wall and right wall of the furnace shell (1) offer the mouth of pipe
(113), the outer wall of the mouth of pipe (113) is provided with adpting flange (114), and the inner chamber of the furnace shell (1) is provided with furnace lining (2),
Anchoring piece (21) is provided between the furnace lining (2) and furnace shell (1), the furnace shell (1) and furnace lining (2) are connected by anchoring piece (21)
Connect, the intracavity bottom of the furnace shell (1) is provided with bearing material furnace bottom (3), and the top of the bearing material furnace bottom (3) uniformly offers air-flow
Hole (31), the inner chamber of the bearing material furnace bottom (3) is provided with guide rail (32), and the bottom of the guide rail (32) is provided with high-alumina brick (33)
With impervious carbon brick (34), the outer wall middle setting of the furnace shell (1) has fire door (4), and the fire door (4) is including fire door steel plate
(41), the outer wall of the fire door steel plate (41) is evenly arranged with ulla grass section bar (42), and the left end and right-hand member of the fire door (4) are all provided with
Furnace door lifting device (5) is equipped with, the furnace door lifting device (5) includes gantry frame (51), the top of the gantry frame (51)
Portion is provided with drive motor (52), and the right-hand member of the drive motor (52) is provided with sprocket wheel (53), the outer wall of the sprocket wheel (53)
Driving-chain (54) is provided with, the bottom of the driving-chain (54) is fixedly connected with the outer wall of fire door (4), the top of the fire door (4)
Portion is provided with oven door sealing hold down gag (6), and the inner chamber of the oven door sealing hold down gag (6) is provided with multiple spot pneumatic clamping machine
Structure (61), the inner chamber of the furnace lining (2) is provided with natural gas heating system (7), and the natural gas heating system (7) is including eight groups
From preheating burner (71), the outer wall from preheating burner (71) is provided with automatic ignition and control system (72), described from advance
The gas transmission end connecting gas transmission pipe road (73) of hot burner (71), at the top of the gas pipeline (73) high pressure combustion fan is provided with
(74), the high pressure combustion fan (74) is arranged on the top of furnace shell (1), and the outer wall of the high pressure combustion fan (74) is provided with
Sound proof box (741), the outer wall of the sound proof box (741) is provided with protective cover (742), and the outer wall of the furnace shell (1) is plugged with heat
Galvanic couple (8), the thermocouple (8) is plugged on the inner chamber of furnace lining (2).
2. a kind of box type heater according to claim 1, it is characterised in that：The outer wall of the furnace shell (1) scribbles resistance to height
The priming paint and finish paint of temperature, furnace shell (1) outer wall is provided with thermometer hole and peep-hole.
3. a kind of box type heater according to claim 1, it is characterised in that：It is provided between the ulla grass section bar (42)
Ceramic fiber blanket and module, the guide rail (32) is fallen to beat and pours into shaped brick for high intensity.
4. a kind of box type heater according to claim 1, it is characterised in that：The high pressure combustion fan (74) is including electricity
Motivation (748), the right-hand member of the motor (748) is provided with bearing cap (746), and the right-hand member of the bearing cap (746) is provided with
Left sound insulation lid (743), the right-hand member of the left sound insulation lid (743) is arranged on the left end of sound proof box (741), the sound proof box (741)
Right-hand member be provided with right sound insulation lid (744), the right-hand member of the right sound insulation lid (744) is provided with wind sucting tube (745), the sound proof box
(741) outer wall is provided with outlet air flange (747).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621028474.8U CN206109486U (en) | 2016-08-30 | 2016-08-30 | Box -type heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621028474.8U CN206109486U (en) | 2016-08-30 | 2016-08-30 | Box -type heating furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206109486U true CN206109486U (en) | 2017-04-19 |
Family
ID=58518703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621028474.8U Expired - Fee Related CN206109486U (en) | 2016-08-30 | 2016-08-30 | Box -type heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206109486U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106244789A (en) * | 2016-08-30 | 2016-12-21 | 赫菲斯热处理系统江苏有限公司 | A kind of box type heater |
| CN109014129A (en) * | 2018-08-14 | 2018-12-18 | 昆山拓卡家居用品有限公司 | A kind of molten aluminum holding furnace suitable for aluminum alloy car wheel low pressure casting |
-
2016
- 2016-08-30 CN CN201621028474.8U patent/CN206109486U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106244789A (en) * | 2016-08-30 | 2016-12-21 | 赫菲斯热处理系统江苏有限公司 | A kind of box type heater |
| CN106244789B (en) * | 2016-08-30 | 2018-06-01 | 赫菲斯热处理系统江苏有限公司 | A kind of box type heater |
| CN109014129A (en) * | 2018-08-14 | 2018-12-18 | 昆山拓卡家居用品有限公司 | A kind of molten aluminum holding furnace suitable for aluminum alloy car wheel low pressure casting |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170419 |