CN101439393B - Compound casting device and process of continuous casting machine - Google Patents
Compound casting device and process of continuous casting machine Download PDFInfo
- Publication number
- CN101439393B CN101439393B CN200810232694A CN200810232694A CN101439393B CN 101439393 B CN101439393 B CN 101439393B CN 200810232694 A CN200810232694 A CN 200810232694A CN 200810232694 A CN200810232694 A CN 200810232694A CN 101439393 B CN101439393 B CN 101439393B
- Authority
- CN
- China
- Prior art keywords
- crystallizer
- water tank
- copper coin
- internal cavity
- last
- 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
Images
Landscapes
- Continuous Casting (AREA)
Abstract
The invention relates to the metallurgical industry continuous casting field and provides a continuous casting machine composite casting device and a technology that two different metals are respectively distributed inside and outside a continuous casting blank. The invention is characterized in that the continuous casting machine composite casting device comprises an upper crystallizer, a lower steel casting system (9), a lower crystallizer and a dummy ingot; the inside of the upper crystallizer and the inside of the lower crystallizer are respectively provided with an inner cavity; the inner cavity of the lower crystallizer is larger than the inner cavity of the upper crystallizer; the inner cavity of the lower crystallizer is same as the lower steel casting system; the shape and the size of a carbon steel billet core of a composite casting blank are determined by the inner cavity of the upper crystallizer; the final shape and the size of the composite casting blank are determined by the inner cavity of the lower crystallizer; and the difference of the sections of the inner cavities of the upper crystallizer and the lower crystallizer is a stainless steel layer of the composite casting blank. The continuous casting machine composite casting technology is carried out by six steps of cast starting technology and cast stopping technology. The composite casting blank is rolled and made into composite plates of different specifications according to the requirement, and the composite plates not only have good mechanical performance but also have the function of rust prevention and nice appearance.
Description
Technical field
The present invention relates to metallurgy industry continuous casting field, is conticaster composite casting device and technology that two kinds of different metals are distributed in the inside and outside position of continuous billet casting respectively.
Background technology
Continuous casting is a maturation process technology of directly processing motlten metal blank.The tradition continuous casting technology can only be produced single metal stock.Because in use relatively there is the problem that bad mechanical property, price are higher, be prone to get rusty in single metal base with compound casting, in commercial production and the daily life to the new requirement of the increasing proposition of the demand of compound strand.
Summary of the invention
The purpose of this invention is to provide a kind of inside is carbon steel, is the conticaster composite casting device and the technology of the continuous casting steel billet of stainless composite material all around.
The objective of the invention is to realize like this; Conticaster composite casting device; It is characterized in that: comprise crystallizer, water steel system, down crystallizer, dummy ingot four parts down; Last crystallizer by last outer wide water tank, go up outer wide copper coin, go up inner width face water tank, go up inner width face copper coin, go up right narrow copper plate, go up right leptoprosopy water tank, go up left leptoprosopy water tank, go up left narrow copper plate and form; The going up outer wide copper coin, go up inner width face copper coin, go up right narrow copper plate and go up the last inner chamber that left narrow copper plate forms of last crystallizer, formation can be born the base shell of external force such as metallic solution static pressure; Go up outer wide water tank, go up inner width face water tank, go up right leptoprosopy water tank 6 and go up left leptoprosopy water tank and be distributed in outside the inner chamber; The bottom crystallizer by following inner width face water tank, down inner width face copper coin, down outer wide copper coin, down outer wide water tank, down left leptoprosopy water tank, down left narrow copper plate, down right narrow copper plate, right leptoprosopy water tank is formed down; Inner the same crystallizer equally forms an inner chamber; The lower chamber that following inner width face copper coin, following outer wide copper coin, following left narrow copper plate and down right narrow copper plate form; Following inner width face water tank, following outer wide water tank, following left leptoprosopy water tank and following right leptoprosopy water tank are distributed in outside the lower inner cavity; Following crystallizer internal cavity is bigger than last crystallizer; Following crystallizer internal cavity with under to water the steel system identical; Last crystallizer internal cavity determines the carbon steel base core shape and the size of compound strand; Following crystallizer internal cavity determines the net shape and the size of compound strand, and the difference in crystallizer internal cavity cross section is exactly the stainless steel layer of compound strand up and down;
Described crystallizer lower end down has sufficient roller that slab is play the guiding role.
The described difference in crystallizer internal cavity cross section up and down is the stainless steel layer thickness of compound strand.
Between described water tank and its corresponding copper coin the water flowing cooling bath is arranged all, mobile cooling water is arranged in the water tank.
The leptoprosopy water tank belt narrow copper plate and can be moved within the specific limits up and down, to regulate the strand width of required cast; Dummy ingot is made up of dummy bar head, begins casting and be to be used for stopping up up and down the crystallizer internal cavity biscuit fire inner chamber that coordinates, partly form base shell in biscuit fire with certain intensity after, accomplish to open through the downward throwing of dummy ingot effect and water.
The conticaster compound casting technique is characterized in that: the first step, dummy bar head is delivered to position between the copper coin up and down; The gap of filling dummy bar head and forming between copper coin up and down with filler; On the one hand molten liquid steel is not merged with dummy bar head and protect dummy bar head, prevent that on the other hand epicoele from flowing into bottom stainless steel spout, prevent that simultaneously molten metal bath is from dummy bar head and the outflow of the slit between copper coin up and down; Cause device damage, influence is opened and is watered realization;
In second step, go up the cavity injection carbon steel fused solution that copper coin forms to the left and right;
In the 3rd step, when dummy bar head began to move down, beginning poured into stainless steel steel fused solution at the stainless molten steel sprue gate in the copper coin outside up and down;
The 4th step when dummy bar head begins to move down, began to inject the stainless steel fused solution, got into the ordinary production operation when dummy bar head arrives after taking off ingot after taking off the ingot position;
In the 5th step, stop pouring technique: stop the injection of metal melting molten steel;
In the 6th step, the throwing tail makes the molten steel that remains in the stainless steel storage pool flow into the base tail end fully, and condenses with it.
Advantage of the present invention is: liquid carbon steel Metal Melting smelting through outer wide the copper coin 2 of going up of last crystallizer, go up inner width face copper coin 4, go up right narrow copper plate 5 and go up the last inner chamber that left narrow copper plate 8 forms after; Form around the smelting of liquid carbon steel Metal Melting and can bear the base shell of external force such as certain metallic solution static pressure; Along with moving down continuously of this part; When arriving the lower chamber of subordinate's inner width face copper coin 11 down, outer wide copper coin 13, left narrow copper plate 16 and 17 formation of down right narrow copper plate down down; Carbon steel base shell by around filling rust steel solution surround, and through the water-cooled of crystallizer down but, the stainless steel solution around making closes with the carbon steel base shell melting of inside and is set in.Along with strand continue move down, through constantly spraying the cooling of cooling water, strand is cooled off gradually, and forms " stainless steel and carbon steel " compound strand finished product through cutting to casting billet surface.The rolling as required formation different size of compound strand composite board, the existing favorable mechanical performance of composite board has antirust aesthetic function again.
Description of drawings
Below in conjunction with the embodiment accompanying drawing the present invention is described further.
Fig. 1 is an embodiment of the invention structural representation;
Fig. 2 is that Fig. 1 rotates 90 degree direction working state schematic representations;
Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11 are conticaster compound casting technique different step procedure declaration figure.
Among the figure: 1, go up outer wide water tank; 2, go up outer wide copper coin; 3, go up inner width face water tank; 4, go up inner width face copper coin; 5, go up right narrow copper plate; 6, go up right leptoprosopy water tank; 7, go up left leptoprosopy water tank; 8, go up left narrow copper plate; 9, water the steel system down; 10, following inner width face water tank; 11, following inner width face copper coin; 12, sufficient roller; 13, down outer wide copper coin; 14, down outer wide water tank; 15, following left leptoprosopy water tank; 16, following left narrow copper plate; 17, following right narrow copper plate; 18, following right leptoprosopy water tank; 19, dummy ingot.
The specific embodiment
As depicted in figs. 1 and 2; Comprise crystallizer, water steel system 9, down crystallizer, dummy ingot four parts down; Last crystallizer by last outer wide water tank 1, go up outer wide copper coin 2, go up inner width face water tank 3, go up inner width face copper coin 4, go up right narrow copper plate 5, go up right leptoprosopy water tank 6, go up left leptoprosopy water tank 7, go up left narrow copper plate 8 and form; The going up outer wide copper coin 2, go up inner width face copper coin 4, go up right narrow copper plate 5 and go up the last inner chamber that left narrow copper plate 8 forms of last crystallizer, formation can be born the base shell of external force such as metallic solution static pressure; Go up outer wide water tank 1, go up inner width face water tank 3, go up right leptoprosopy water tank 6 and go up left leptoprosopy water tank 7 and be distributed in outside the inner chamber; The bottom crystallizer is by following inner width face water tank 10, inner width face copper coin 11, outer wide copper coin 13, outer wide water tank 14, down left leptoprosopy water tank 15, down left narrow copper plate 16, down right narrow copper plate 17, right leptoprosopy water tank 18 down down down down; Inner the same crystallizer equally forms an inner chamber; Following inner width face copper coin 11, outer wide copper coin 13, the lower chamber that forms of left narrow copper plate 16 and down right narrow copper plate 17 down down.Following inner width face water tank 10, down outer wide water tank 14, down left leptoprosopy water tank 15 and down right leptoprosopy water tank 18 be distributed in outside the lower inner cavity; Following crystallizer internal cavity is bigger than last crystallizer; Following crystallizer internal cavity with under to water the steel system identical; Last crystallizer internal cavity determines the carbon steel base core shape and the size of compound strand; Following crystallizer internal cavity determines the net shape and the size of compound strand, and the difference in crystallizer internal cavity cross section is exactly the stainless steel layer thickness of compound strand up and down.Following crystallizer lower end has 12 pairs of slabs of sufficient roller to play the guiding role.
Go up outer wide water tank 1 and last outer wide copper coin 2, go up inner width face water tank 3 and last inner width face copper coin 4, go up right narrow copper plate 5 and last right leptoprosopy water tank 6 and reach upward that left leptoprosopy water tank 7 and 8 of last left narrow copper plates all have the water flowing cooling bath, mobile cooling water is arranged in the water tank.
The leptoprosopy water tank belt narrow copper plate and can be moved within the specific limits up and down, to regulate the strand width of required cast; Dummy ingot is made up of dummy bar head 19 grades, begins casting and be to be used for stopping up up and down the crystallizer internal cavity biscuit fire inner chamber that coordinates, partly form base shell in biscuit fire with certain intensity after, accomplish to open through the downward throwing of dummy ingot effect and water.
During work; The smelting of liquid carbon steel Metal Melting through outer wide the copper coin 2 of going up of last crystallizer, go up inner width face copper coin 4, go up right narrow copper plate 5 and go up the last inner chamber that left narrow copper plate 8 forms after; Form around the smelting of liquid carbon steel Metal Melting and can bear the base shell of external force such as certain metallic solution static pressure; Along with moving down continuously of this part, when arrive subordinate's inner width face copper coin 11 down, down outer wide copper coin 13, down left narrow copper plate 16 and down right narrow copper plate 17 form lower chamber the time, carbon steel base shell by around the encirclement of filling rust steel solution; And the water-cooled of the following crystallizer of process but, and the stainless steel solution around making closes with the carbon steel base shell melting of inside and is set in.Along with strand continue move down, through constantly spraying the cooling of cooling water, strand is cooled off gradually, and forms " stainless steel and carbon steel " compound strand finished product through cutting to casting billet surface.。
When the molten steel of crystallizer internal cavity; The cooling water of copper coin of flowing through is delivered to the cooling water in the heat transferred copper coin tank on the copper coin with molten steel; Along with cooling water is taken away heat from the outflow of water tank outlet, thereby make the molten liquid steel that contact with copper coin solidify formation base shell.
Last copper coin will be in the cooling water in the copper coin tank on the heat transferred of the carbon steel liquation in the cavity that copper coin forms; Solidify formation carbon steel base shell around making the carbon steel fused solution that is in this position; Cooling water under the heat transferred of the stainless steel fused solution under following copper coin will be between copper coin and carbon steel base shell in the copper coin tank; The stainless steel at this position is solidified, form the compound base shell that stainless steel and carbon steel merge.
Open pouring technique:
The first step is as shown in Figure 3; Dummy bar head is delivered to position between the copper coin up and down, and the gap with filler is filled dummy bar head and formed between copper coin is not up and down merged molten liquid steel on the one hand and is protected dummy bar head with dummy bar head; Prevent that on the other hand epicoele from flowing into bottom stainless steel spout; Prevent that simultaneously molten metal bath from from dummy bar head and the outflow of the slit between copper coin up and down, causing device damage, influence is opened and is watered realization.
Second step is as shown in Figure 4, goes up the cavity injection carbon steel fused solution that copper coin forms to the left and right.
The 3rd step is as shown in Figure 5, and when dummy bar head began to move down, beginning poured into stainless steel steel fused solution at the stainless molten steel sprue gate in the copper coin outside up and down.
The 4th step when dummy bar head begins to move down, began to inject the stainless steel fused solution like Fig. 6 and shown in Figure 7, when dummy bar head arrive take off ingot after taking off the ingot position after entering ordinary production operation.
Stop pouring technique:
The 5th step is like Fig. 8 and shown in Figure 9. stop the injection of metal melting molten steel.
The 6th step is shown in figure 10, and the throwing tail makes the molten steel that remains in the stainless steel storage pool flow into the base tail end fully, and condenses with it.
The 7th step is shown in figure 11, pulls out the base tail.
The rolling as required formation different size of compound strand composite board, the existing favorable mechanical performance of composite board has antirust aesthetic function again.
Claims (2)
1. conticaster composite casting device; It is characterized in that: comprise crystallizer, water steel system (9), down crystallizer, dummy ingot four parts down; Last crystallizer by last outer wide water tank (1), go up outer wide copper coin (2), go up inner width face water tank (3), go up inner width face copper coin (4), go up right narrow copper plate (5), go up right leptoprosopy water tank (6), go up left leptoprosopy water tank (7), go up left narrow copper plate (8) and form; The going up outer wide copper coin (2), go up inner width face copper coin (4), go up the last crystallizer internal cavity of right narrow copper plate (5) and last left narrow copper plate (8) formation of last crystallizer, formation can be born the base shell of metallic solution static pressure; Last outer wide water tank (1), last inner width face water tank (3), last right leptoprosopy water tank (6) and last left leptoprosopy water tank (7) are distributed in outside the crystallizer internal cavity; The bottom crystallizer by following inner width face water tank (10), down inner width face copper coin (11), down outer wide copper coin (13), down outer wide water tank (14), down left leptoprosopy water tank (15),
Left narrow copper plate (16), following right narrow copper plate (17), following right leptoprosopy water tank (18) are formed down; Inner the same crystallizer equally forms an inner chamber; The following crystallizer internal cavity that following inner width face copper coin (11), down outer wide copper coin (13), following left narrow copper plate (16) and following right narrow copper plate (17) form; Following inner width face water tank (10), down outer wide water tank (14), following left leptoprosopy water tank (15) and following right leptoprosopy water tank (18) are distributed in down outside the crystallizer internal cavity; Following crystallizer internal cavity is bigger than last crystallizer internal cavity; Following crystallizer internal cavity with under to water the steel system identical; Last crystallizer internal cavity determines the carbon steel base core shape and the size of compound strand; Following crystallizer internal cavity determines the net shape and the size of compound strand, and the difference in crystallizer internal cavity cross section is exactly the stainless steel layer of compound strand up and down; Described crystallizer lower end down has sufficient roller (12) that compound strand is play the guiding role; The described difference in crystallizer internal cavity cross section up and down is the stainless steel layer thickness of compound strand; Between described water tank and its corresponding copper coin the water flowing cooling bath is arranged all, mobile cooling water is arranged in the water tank; The leptoprosopy water tank belt narrow copper plate and can be moved within the specific limits up and down, to regulate the strand width of required cast.
2. based on the conticaster compound casting technique of the conticaster composite casting device of claim 1; It is characterized in that: the first step; Dummy bar head is delivered to position between the copper coin up and down, and the gap with filler is filled dummy bar head and formed between copper coin is not up and down merged molten liquid steel on the one hand and is protected dummy bar head with dummy bar head; Prevent that on the other hand it from flowing into bottom stainless steel spout from last crystallizer internal cavity; Prevent that simultaneously molten liquid steel from from dummy bar head and the outflow of the slit between copper coin up and down, causing device damage, influence is opened and is watered realization;
In second step, upwards crystallizer internal cavity injects the carbon steel fused solution;
In the 3rd step, when dummy bar head began to move down, beginning poured into the stainless steel fused solution at the stainless molten steel sprue gate in the copper coin outside up and down;
In the 4th step,, dummy bar head gets into the ordinary production operation after taking off ingot after taking off the ingot position when arriving;
In the 5th step, stop pouring technique: stop the injection of carbon steel fused solution and stainless steel fused solution;
In the 6th step, the throwing tail makes the molten steel that remains in the stainless steel storage pool flow into the base tail end fully, and condenses with it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810232694A CN101439393B (en) | 2008-12-29 | 2008-12-29 | Compound casting device and process of continuous casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810232694A CN101439393B (en) | 2008-12-29 | 2008-12-29 | Compound casting device and process of continuous casting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101439393A CN101439393A (en) | 2009-05-27 |
| CN101439393B true CN101439393B (en) | 2012-09-05 |
Family
ID=40724083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810232694A Expired - Fee Related CN101439393B (en) | 2008-12-29 | 2008-12-29 | Compound casting device and process of continuous casting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101439393B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102120255A (en) * | 2010-12-30 | 2011-07-13 | 中国第一重型机械股份公司 | Manufacturing equipment of laminated composite steel plate and working method thereof |
| CN102179494B (en) * | 2011-04-21 | 2013-05-01 | 东北大学 | Continuous casting method and device for aluminum alloy compounded ingot |
| CN105478701A (en) * | 2015-12-21 | 2016-04-13 | 北京首钢自动化信息技术有限公司 | Automatic pouring stopping control method for double-flow plate blank |
| CN113770319B (en) * | 2021-07-26 | 2023-03-10 | 北京科技大学 | Composite dummy bar and method for stainless steel coated carbon steel liquid-solid composite continuous casting |
| CN117300085B (en) * | 2023-10-11 | 2024-07-02 | 清远楚江高精铜带有限公司 | Forming die and drawing and casting forming equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1836800A (en) * | 2005-03-21 | 2006-09-27 | 孙恩波 | Continuous casting continuous rolling composite metal board and its production method |
| CN2853231Y (en) * | 2005-12-27 | 2007-01-03 | 宝山钢铁股份有限公司 | Metal continuous casting crystallizer of compatible of thin slab and conventional thickness slab |
| CN100999012A (en) * | 2006-01-10 | 2007-07-18 | 李铁铎 | Continuous casting machine for stainless steel seamless composite hollow pipe blank |
| CN201324816Y (en) * | 2008-12-29 | 2009-10-14 | 中国重型机械研究院 | Composite pouring device of continuous caster |
-
2008
- 2008-12-29 CN CN200810232694A patent/CN101439393B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1836800A (en) * | 2005-03-21 | 2006-09-27 | 孙恩波 | Continuous casting continuous rolling composite metal board and its production method |
| CN2853231Y (en) * | 2005-12-27 | 2007-01-03 | 宝山钢铁股份有限公司 | Metal continuous casting crystallizer of compatible of thin slab and conventional thickness slab |
| CN100999012A (en) * | 2006-01-10 | 2007-07-18 | 李铁铎 | Continuous casting machine for stainless steel seamless composite hollow pipe blank |
| CN201324816Y (en) * | 2008-12-29 | 2009-10-14 | 中国重型机械研究院 | Composite pouring device of continuous caster |
Non-Patent Citations (2)
| Title |
|---|
| JP平1-157744A 1989.06.21 |
| JP昭61-293632A 1986.12.24 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101439393A (en) | 2009-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101439393B (en) | Compound casting device and process of continuous casting machine | |
| CN201249259Y (en) | Slab continuous casting tundish | |
| CN109304432B (en) | Single-point unbalanced protection casting device for ultrathin large-size aluminum-containing steel special-shaped blank and using method | |
| CN109663892B (en) | Progressive solidification forming device for large cast ingot or casting blank | |
| CN102398007A (en) | Soft reduction process for continuous casting of large square billet of high chrome alloy steel | |
| CN104259413A (en) | Continuous casting system and process producing large-specification elliptical billets | |
| KR20110121041A (en) | Method for estimating clogging degree of submerged entry nozzle and method for estimating time of changing submerged entry nozzle | |
| CN101219464A (en) | Continuous casting crystallizer capable of controlling liquid level flow field and wave motion | |
| CN201324816Y (en) | Composite pouring device of continuous caster | |
| JP5500401B2 (en) | Continuous casting method of impact guarantee beam blank | |
| CN201008961Y (en) | Casting device of support roll of more than 100 tons complex material supper-scale cast steel | |
| CN102554191B (en) | Aluminum-magnesium alloy composite casting device | |
| CN210146983U (en) | Argon protection device for mould casting ladle nozzle | |
| CN107790655A (en) | Improve the continuous cast method of the austenite stainless steel of surface defect | |
| CN204209084U (en) | A kind of continuous casting system producing the oval base of large gauge | |
| KR101185919B1 (en) | Method for warning clogging of submerged entry nozzle | |
| CN202387948U (en) | Slag stopping casting ladle | |
| NZ583658A (en) | Mould for the continuous casting of metal, and process for producing such a mould | |
| Thomas | Continuous casting (metallurgy) | |
| CN204430223U (en) | The continuous casting production equipment of surface coverage elastomeric material steel and conticaster | |
| JPS609553A (en) | Stopping down type continuous casting machine | |
| CN209998303U (en) | sand mold structure for crankshaft casting | |
| CN218656738U (en) | Continuous casting refractory material of thin slab | |
| KR101193857B1 (en) | Apparatus for exchanging shroud nozzle | |
| KR101424497B1 (en) | Method for manufacting tundish |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA NATIONAL HEAVY MACHINERY RESEARCH INSTITUTE Free format text: FORMER NAME: CHINA HEAVY MACHINERY INSTITUTE |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 710032 Shaanxi city in Xi'an province Xin Jiamiao East yuan Road No. 209 Xi'an Heavy Machinery Research Institute Patentee after: CHINA NATIONAL HEAVY MACHINERY RESEARCH INSTITUTE Co.,Ltd. Address before: 710032 Shaanxi city in Xi'an province Xin Jiamiao East yuan Road No. 209 Xi'an Heavy Machinery Research Institute Patentee before: China National Heavy Machinery Research Institute Co.,Ltd. Address after: 710032 Shaanxi city in Xi'an province Xin Jiamiao East yuan Road No. 209 Xi'an Heavy Machinery Research Institute Patentee after: China National Heavy Machinery Research Institute Co.,Ltd. Address before: 710032 Shaanxi city in Xi'an province Xin Jiamiao East yuan Road No. 209 Xi'an Heavy Machinery Research Institute Patentee before: China National Heavy Machinery Research Institute Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20171229 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |