CN202106253U - Grinding device of roll surface of auxiliary winding roll - Google Patents
Grinding device of roll surface of auxiliary winding roll Download PDFInfo
- Publication number
- CN202106253U CN202106253U CN2011200234650U CN201120023465U CN202106253U CN 202106253 U CN202106253 U CN 202106253U CN 2011200234650 U CN2011200234650 U CN 2011200234650U CN 201120023465 U CN201120023465 U CN 201120023465U CN 202106253 U CN202106253 U CN 202106253U
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- winding
- grinding
- reconditioning
- roller
- helps
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Abstract
The utility model relates to a grinding device of a roll surface of an auxiliary winding roll, comprising a frame (1), a grinding mechanism (2) and a driving mechanism (3), wherein the frame (1) is arranged along the roll surface of the auxiliary winding roll, and the grinding mechanism (2) and the driving mechanism (3) are arranged on the frame; the bottom surface of the frame (1) is provided with traveling grooves (14) for traveling of the grinding mechanism; the grinding mechanism comprises a grinding stone (21) and a fork frame (26), wherein the grinding stone (21) is rotatably butted with the roll surface of the auxiliary winding roll and is used for grinding the roll surface of the auxiliary winding roll; the fork frame (26) supports the grinding stone in a rotatable manner; the fork frame is provided with a pressing spring (24) and a locking nut (25) which are used for applying pressure on the grinding stone, adjusting the friction of the grinding stone on the auxiliary winding roll and locking; the driving mechanism comprises a friction wheel (34) which abuts against the roll surface of the auxiliary winding roll, and a thread screw rod (35) which is connected with the friction wheel by a shaft and is parallel to the auxiliary winding roll; the fork frame is sheathed on the thread screw rod, so that the grinding mechanism can move along the length direction of the thread screw rod. In the grinding device, the disassembly and the assembly are convenient, the cost is low, and the grinding requirement for various rolls can be met.
Description
Technical field
The utility model relates to mechanical field, and particularly, what the utility model related to a kind of metallurgical hot rolling coiler helps winding up roller roll surface arrangement for grinding and grinding method thereof.
Background technology
The hot-rolling mill of field of metallurgy must the large-scale coiling machine of configuration.Helping winding up roller is the critical piece of the large-scale coiling machine of hot rolling, and its effect is to help coiling machine that rolling thin plate is gone into volume and rolling work.Help winding up roller in the course of work of going into volume and rolling, except mainly bearing the wearing and tearing between metal and the metal, together to also receiving the abrasive wear that causes by hard points such as surface of steel plate oxide skins.For this reason, be the quality of the bright and clean and roll bending of guaranteeing to help the winding up roller roll surface, must be regularly to helping the winding up roller surface to carry out reconditioning.
Usually the grinding method that adopts at present is by accomplishing manually.For example, workman's hand is held grinding stone and is stood on the coil stripping car, and that utilize to rotate helps winding up roller reconditioning on roll surface back and forth.Obviously, this method of operating efficient is lower, and through manual reconditioning roll surface back and forth, the reconditioning effect is undesirable, can not guarantee the uniformity and the linearity of whole figuring of surface.In addition, the workman stand in always the coil stripping car hand take grinding stone on the roller of rotation back and forth friction be easy to out security incident.
Also the someone has invented the comparatively advanced winding up roller polisher of helping; Said winding up roller polisher application reel outsourcing one deck burnishing barrel that helps polishes reconditioning to helping winding up roller; This polisher is to be enclosed within on the veneer reeling machine mandrel 6 to install; By helping winding up roller to be pressed against on the burnishing barrel, reach polishing reconditioning effect again through the rotation that helps winding up roller.The whole polishing effect of this technology is better, but helps the winding up roller point bonding outstanding when running into, and it is recessed that whole polishing just can form polishing roll, brings quality to bring influence to follow-up polishing.In addition, the burnishing barrel volume is bigger because polisher is installed on the veneer reeling machine mandrel, and convenience is not enough, and practicality is not enough.
The utility model content
For overcoming the problem that helps the winding up roller reconditioning to exist at present, what the utility model provided a kind of automatic and semi-automatic combination helps winding up roller roll surface arrangement for grinding.
" helping winding up roller roll surface arrangement for grinding and grinding method " of the utility model used tribology principle and driven the threaded screw rod rotation, drives reconditioning mechanism by screw thread straight line shifting principle again and helps winding up roller roll surface length direction to move along whole, helps the reconditioning of winding up roller roll surface.Thus, can under automatic and semi-automatic form, help the reconditioning of winding up roller roll surface.
The technical scheme that helps winding up roller roll surface arrangement for grinding and grinding method of the utility model is following:
A kind of winding up roller roll surface arrangement for grinding that helps comprises: along the framework that helps the setting of winding up roller face, be installed on the reconditioning mechanism on the framework and drive the driving mechanism of said reconditioning mechanism,
It is characterized in that said framework one end is provided with dismountable framework side plate, the other end is provided with driving mechanism, and said framework bottom surface is provided with the walking groove that is used for the walking of reconditioning mechanism, and said walking groove two ends are formed with and loosen groove;
Said reconditioning mechanism comprises: butt helps the winding up roller roll surface, is used for helping the winding up roller roll surface to carry out the grinding stone of reconditioning rotationally; The rotatable crotch that supports said grinding stone, said crotch are provided with can exert pressure, regulate grinding stone to grinding stone to frictional force that helps winding up roller and the holddown spring and the locking nut of locking usefulness;
Driving mechanism comprises: be resisted against the friction pulley that helps on the winding up roller roll surface, the friction pulley that is coupling, be installed on framework two ends, be parallel to the threaded screw rod that helps winding up roller;
Said crotch one end socket is installed on the threaded screw rod, and the other end connects reconditioning mechanism, and reconditioning mechanism can be moved along the threaded screw rod length direction.
According to the described winding up roller roll surface arrangement for grinding that helps of the utility model; It is characterized in that; The cross rotating shaft cover that said reconditioning mechanism also comprises the T-shaped rotating shaft of butt grinding stone and is spirally connected with it, cross rotating shaft sleeve is connected to the crotch support arm, and clamp nut is spirally connected behind the T-shaped rotating shaft other end socket holddown spring.
Thus, make to rotatably compress nut, can regulate the T-shaped rotating shaft to grinding stone via the holddown spring and the clamp nut that is spirally connected, and grinding stone is to helping the frictional force of winding up roller.Said T-shaped rotating shaft can change its angle through cross rotating shaft cover.
According to the described winding up roller roll surface arrangement for grinding that helps of the utility model, it is characterized in that framework one end is provided with detachable framework side plate, the other end is provided with the friction race that is used to install friction pulley.
According to the described winding up roller roll surface arrangement for grinding that helps of the utility model; It is characterized in that friction pulley directly contact helps winding up roller to pass through friction realization rotation, the friction pulley outer ring is a rubber sleeve; Adopt metal wheel, the pin grooves place on threaded screw rod of the keyway matching and fixing on pin and the metal wheel in the middle of the friction pulley.
Because the friction pulley outer ring is consumable accessory, also is friction member, makes so adopt with the rubber sleeve that is easy to change the friction pulley outer ring, the middle metal wheel that adopts is enclosed within pin grooves place on the screw mandrel, the keyway matching and fixing on pin and the metal wheel, the transfer of prevention friction pulley.
According to the described winding up roller roll surface arrangement for grinding that helps of the utility model, it is characterized in that the said handwheel that helps winding up roller roll surface arrangement for grinding one end to be provided with the threaded screw rod that is coupling.
Thus, the two end diameters of thread of threaded screw rod when reconditioning mechanism deviates from, can be provided with the backstop spring that stops reconditioning mechanism steadily to be deviate from less than the screw thread polished rod at polished rod place end after helping the winding up roller roll surface to move to two ends.
According to the described winding up roller roll surface arrangement for grinding that helps of the utility model, it is characterized in that the two end diameters of thread of threaded screw rod are less than the screw thread polished rod.
According to the described winding up roller roll surface arrangement for grinding that helps of the utility model, it is characterized in that two ends of threaded screw rod are provided with sliding bearing and backstop spring.
The utility model method of work is following:
Help the winding up roller rotation, under the rotation that helps winding up roller,, make that being pressed against the friction pulley that helps the driving mechanism on the winding up roller roll surface is done to rotate together by drive through friction by the rotation that helps winding up roller.By the rotation of friction pulley, drive its threaded screw rod that is coupling and rotate again.The screw thread straight line of threaded screw rod moves the reconditioning mechanism edge that drives connection and helps the winding up roller length direction to move.After moving to the top that helps winding up roller when reconditioning mechanism, compression backstop spring, wire rod thread is deviate from by reconditioning mechanism, does not do mobile.And under the effect of reconditioning mechanism holddown spring power, swing to backward on the framework and loosen in the groove for what reconditioning finished to design to the top.
When needing local reconditioning, can unclamp friction pulley, load onto rotation hand wheel, drive moving of arrangement for grinding, reach the effect of local reconditioning through rotation hand wheel through the adjusting bolt at framework two ends.
Originally help the grinding method of winding up roller roll surface arrangement for grinding; And be different from original field repair and help the custom of winding up roller and use the method for polishing roll reconditioning, effectively solve on-the-spot actual reconditioning and help the potential safety hazard and the existing problem of polishing roll reconditioning that exist in the winding up roller, reduced labour, time, the quality that has improved reconditioning and installation effectiveness.This installs easy accessibility, and is with low cost, can satisfy the on-the-spot reconditioning demand of all kinds of rollers.
Be convenient light and handy the installation, the arrangement for grinding framework designs for hollow out, and installation need only just can realize the installation of arrangement for grinding by two bolts that help winding up roller two end axles bearing end cap face.Arrangement for grinding is to help the winding up roller pivoting friction to drive the friction wheel from rotation of driving mechanism and the rotation of threaded screw rod by the reconditioning mechanism that is used for the reconditioning roll surface of installing on the arrangement for grinding framework with utilization, reaches the purpose that the unidirectional straight line of reconditioning mechanism moves.The framework of this case design is adjustable, helps realizing automatic reconditioning and the manually switching of reconditioning.
The reconditioning principle of this arrangement for grinding is all very simple, convenient with application; Need not motor-driven, just rely on the rotation that helps winding up roller to be pressed against to help that the friction pulley on the driving mechanism rotates through friction together on the winding up roller roll surface, the threaded screw rod that is driven in the driving mechanism by the rotation of friction pulley again rotates; Make and drive reconditioning mechanism along helping the winding up roller length direction to move; After moving to the top that helps winding up roller when reconditioning mechanism, compression backstop spring, wire rod thread is deviate from by reconditioning mechanism; Do not do mobilely, and under the effect of reconditioning mechanism holddown spring power, swing to backward on the framework and loosen in the groove for what reconditioning finished to design to the top.This arrangement for grinding has also designed rotation hand wheel for artificial semi-automatic reconditioning; When the reconditioning of needs part, can unclamp friction pulley through the adjusting bolt at framework two ends, load onto rotation hand wheel; Drive moving of arrangement for grinding through rotation hand wheel, reach the effect of local reconditioning.The design has reached fully and solve to have leaned on staff to take grinding stone, stands in unsafe problems that reconditioning on the coil stripping car helps winding up roller, has improved reconditioning and help winding up roller to get quality and installation effectiveness, goal of the invention easy to use.
Description of drawings
Fig. 1 helps winding up roller roll surface arrangement for grinding sketch map for the utility model.
Fig. 2 helps winding up roller roll surface arrangement for grinding reconditioning structural scheme of mechanism for the utility model.
Fig. 3,4 are respectively the sketch map that helps winding up roller roll surface arrangement for grinding reconditioning mechanism different angles of the utility model.
Fig. 5 helps winding up roller roll surface arrangement for grinding driving mechanism sketch map for the utility model.
Fig. 6 helps winding up roller roll surface arrangement for grinding FRAME COMPONENTS figure for the utility model.
Fig. 7 helps winding up roller roll surface arrangement for grinding driving mechanism sketch map for the utility model.
Fig. 8 helps winding up roller roll surface arrangement for grinding work sketch map for the utility model.
Wherein 1 is framework, and 2 are reconditioning mechanism, and 3 is driving mechanism, and 11 for regulating bolt, and 12 is transition connecting plate, and 13 is the framework side plate, and 14 are the walking groove,
21 is grinding stone, and 22 is the T-shaped rotating shaft, and 23 is cross rotating shaft cover, and 24 is holddown spring, and 25 is clamp nut, and 6 is crotch, and 27 is fixed side
32 is threaded screw rod, and 33 is pin, and 34 is friction pulley, and 35 is fastening screw nut, and 36 is handwheel, and 37 is the anticreep bolt, and 38 is sliding bearing.
The specific embodiment
Embodiment 1
" helping winding up roller roll surface arrangement for grinding and grinding method " of the utility model used control method by framework, reconditioning mechanism and driving mechanism three parts and the cover scene that is equipped with and constituted (seeing figure).
Framework 1: support whole arrangement for grinding, it is by regulating bolt, transition connecting plate and framework side plate composition.Whole framework designs for hollow out, throws off roll surface in the back on earth in order to make 2 walkings of reconditioning mechanism, so in two side tip designs of reconditioning mechanism 2 walking grooves (14) groove of loosening is arranged; The installation of mechanism of reconditioning for ease 2 and driving mechanism 3; Framework one side is designed to detachable framework side plate (13) right side and is designed with the friction race that friction pulley is installed, and is designed with the adjusting bolt (11) that tightens up and unclamp friction pulley on the two side transition connecting plate (12).
Reconditioning mechanism 2 (seeing figure): be to carry out the critical piece that reconditioning helps winding up roller through grinding stone (21), it is by grinding stone (21); T-shaped rotating shaft (22); Cross rotating shaft cover (23); Holddown spring (24); Clamp nut (25); Crotch (26); Fixed side (27) parts are formed.Grinding stone (21) is used for helping the direct reconditioning of winding up roller;
The middle straight masthead end of T-shaped rotating shaft (22) is designed with screw thread, and it can change its angle through cross rotating shaft cover (23).Through holddown spring (24), and clamp nut (25) can be regulated grinding stone to helping the frictional force of winding up roller.
Crotch (26) is an asymmetrical design; Mainly be to consider the reconditioning that friction pulley position, right side is helped winding up roller; Crotch (26) bottom is a screwed hole, is installed in the threaded screw rod (32), and the supporting whole reconditioning mechanism 2 that does moves along threaded screw rod (32) length direction with the screw thread of threaded screw rod.
Fixed side (27): two side fixed sides (27) pass through bolt and nut with grinding stone (21); T-shaped rotating shaft (22) and crotch are connected and fixed.
Driving mechanism is by sliding bearing (31,38,39); Threaded screw rod (32); Pin (33); Friction pulley (34); Fastening screw nut (35); Handwheel (36); Anticreep bolt (37) is formed.
Friction pulley (34): help winding up roller to pass through friction realization rotation for directly contacting; The friction pulley outer ring is consumable accessory, also is friction member; So the friction pulley outer ring is adopted with the rubber sleeve that is easy to change and made, the middle metal wheel that adopts is enclosed within pin grooves place on the screw mandrel; Keyway matching and fixing on pin (33) and the metal wheel stops the friction pulley transfer.When the semi-automatic reconditioning of needs,, install handwheel (36) and just can carry out as long as, unclamp friction pulley through the adjusting bolt on the framework side plate.
Threaded screw rod (32) screw thread two ends are designed to diameter less than the screw thread polished rod, are used for reconditioning mechanism and behind the top, deviate from, and end is provided with the backstop spring that stops reconditioning mechanism steadily to be deviate from the polished rod place.
(1), reconditioning mechanism is inserted in the framework walking groove → friction pulley is placed on aims at → penetrate threaded screw rod in the framework friction race and progressively put on sliding bearing, backstop spring, install pin; Fix reconditioning mechanism, friction pulley, the fastening screw nut of screwing → cover upper left side framework side plate → bolt framework side plate, help winding up roller roll surface arrangement for grinding installation (seeing figure).
Reconditioning control method (seeing figure): this arrangement for grinding can be selected automatically and semi-automatic local reconditioning according to the situation that helps the reconditioning of winding up roller needs, and also the scalable reconditioning helps the thrust of winding up roller to reach maximum reconditioning effect and quality.
1. reconditioning automatically: rotate threaded screw rod; With left side or the right side of reconditioning mechanism near arrangement for grinding framework walking groove; Be connected arrangement for grinding two side transition connecting plate on the screwed hole of the bearing block side plate that helps winding up roller two sides with bolt again; Tighten up two sides and regulate bolt and friction pulley is close to help winding up roller, regulate and tighten up nut and just can regulate the reconditioning pressure that the grinding stone reconditioning helps winding up roller (through T-shaped rotating shaft intermediate bar shimming or lengthening in the reconditioning mechanism, shorten the mode of spring and carry out the adjusting of clamp nut, can increase or reduce the reconditioning thrust of grinding stone) roll surface; Help winding up roller to rotate, can realize that just automatic reconditioning helps winding up roller.
2. local reconditioning: unclamp mounted winding up roller roll surface arrangement for grinding two sides that help and regulate bolt, friction pulley is thrown off help winding up roller, unclamp the clamp nut in the T-shaped rotating shaft; Install handwheel, rotate handwheel, with reconditioning mechanism near need reconditioning position; According to the needs that help the winding up roller figuring of surface, regulate the thrust of the clamp nut in the T-shaped rotating shaft, grinding stone is pressed on helps winding up roller to need the position of reconditioning; Help winding up roller to rotate, the left-right rotation handwheel just can carry out semi-automatic local reconditioning again.
Grinding method (seeing figure): sharpening machine is set up in an end of framework walking groove; Connect → respectively shed the screwed hole → bolt of screwing that on the installing hole aiming axis bearing end face on the winding up roller roll surface arrangement for grinding framework side plate two of two bolts helping on the winding up roller two end axles bearing end face → will help shed bolt → the tighten up adjusting bolt on the two body side frame side plates is close to friction pulley to help winding up roller → basis to help the reconditioning degree of winding up roller with wire rod thread; The nut of regulating in the reconditioning mechanism that tightens up compresses grinding stone to help winding up roller → operated from a distance to rotate and helps winding up roller → move to the framework walking groove other end and disengage threads when the reconditioning of reconditioning mechanism; Reconditioning mechanism bullet backward helps winding up roller stall → need once more during reconditioning to loosening groove → operated from a distance; Reconditioning mechanism is released framework loosen groove, under the effect of backstop spring, push wire rod thread → operated from a distance to and help winding up roller counter-rotating → walking groove other end to reconditioning mechanism to framework.
Semi-automatic local reconditioning: → unclamp adjusting bolt on the two body side frame side plates friction pulley to be left help winding up roller → install handwheel, and screw on anticreep bolt → rotation handwheel make reconditioning mechanism to help winding up roller need in reconditioning position → adjustings reconditioning mechanism tighten up nut or replacing tighten up spring arrive the required pressure → operated from a distance of reconditioning help winding up roller rotate → manually positive and negatively rotate handwheel to the reconditioning end and the winding up roller stall of will seeking help repeatedly.
" helping winding up roller roll surface arrangement for grinding and grinding method " of the utility model made simply, installs light and handy, convenient, practical; It has not only solved the people and need not stand on the coil stripping car always and go to carry out the reconditioning safety problem with hand; And only need just can arrangement for grinding be installed in and help on the winding up roller body shaft bearing with 4 bolts; Compared with prior art the quality of reconditioning and the efficient of installation are further enhanced simultaneously; Realized automatic and semi-automatic switch application, the scene that reaches fully helps the reconditioning requirement of winding up roller.
Claims (7)
1. one kind is helped winding up roller roll surface arrangement for grinding, comprising: along the framework (1) that helps the winding up roller face to be provided with, be installed on reconditioning mechanism (2) and the driving mechanism (3) of the said reconditioning of driving mechanism on the framework (1),
It is characterized in that; Said framework (1) one end is provided with dismountable framework side plate (13); The other end is provided with driving mechanism (3), and said framework (1) bottom surface is provided with the walking groove (14) that is used for reconditioning mechanism (2) walking, and said walking groove (14) two ends are formed with and loosen groove;
Said reconditioning mechanism (2) comprising: butt helps the winding up roller roll surface, is used for helping the winding up roller roll surface to carry out the grinding stone (21) of reconditioning rotationally; The rotatable crotch (26) that supports said grinding stone, said crotch (26) are provided with and can exert pressure, regulate grinding stone to frictional force that helps winding up roller and the holddown spring (24) and the locking nut (25) of locking usefulness to grinding stone (21);
Driving mechanism (3) comprising: be resisted against the friction pulley (34) that helps on the winding up roller roll surface, the friction pulley that is coupling (34), be installed on framework (1) two end, be parallel to the threaded screw rod (32) that helps winding up roller;
Said crotch (26) one end sockets are installed on the threaded screw rod (32), and the other end connects reconditioning mechanism (2), and reconditioning mechanism (2) can be moved along threaded screw rod (32) length direction.
2. the winding up roller roll surface arrangement for grinding that helps according to claim 1; It is characterized in that; Said reconditioning mechanism (2) also comprises the T-shaped rotating shaft (22) of butt grinding stone and the cross rotating shaft cover (23) that is spirally connected with it; Cross rotating shaft cover (23) is coupling in crotch (26) support arm, and clamp nut (25) is spirally connected behind T-shaped rotating shaft (22) other end socket holddown spring (24).
3. the winding up roller roll surface arrangement for grinding that helps according to claim 1; It is characterized in that; Friction pulley (34) directly contact helps winding up roller to pass through friction realization rotation; Friction pulley (34) outer ring is a rubber sleeve, adopts metal wheel in the middle of the friction pulley, and the keyway matching and fixing on pin (33) and the metal wheel goes up the pin grooves place at threaded screw rod (32).
4. the winding up roller roll surface arrangement for grinding that helps according to claim 1 is characterized in that, the said handwheel (36) that helps winding up roller roll surface arrangement for grinding one end to be provided with the threaded screw rod that is coupling (32).
5. the winding up roller roll surface arrangement for grinding that helps according to claim 1 is characterized in that the two end diameters of thread of threaded screw rod (32) are less than the screw thread polished rod.
6. the winding up roller roll surface arrangement for grinding that helps according to claim 1 is characterized in that two ends of threaded screw rod (32) are provided with sliding bearing (31) and backstop spring (38).
7. the winding up roller roll surface arrangement for grinding that helps according to claim 1 is characterized in that framework two ends are provided with transition connecting plate (12), is designed with the adjusting bolt (11) that is used to lock and unclamp friction pulley on it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200234650U CN202106253U (en) | 2011-09-02 | 2011-09-02 | Grinding device of roll surface of auxiliary winding roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200234650U CN202106253U (en) | 2011-09-02 | 2011-09-02 | Grinding device of roll surface of auxiliary winding roll |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202106253U true CN202106253U (en) | 2012-01-11 |
Family
ID=45431702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200234650U Expired - Fee Related CN202106253U (en) | 2011-09-02 | 2011-09-02 | Grinding device of roll surface of auxiliary winding roll |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202106253U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107672115A (en) * | 2017-09-11 | 2018-02-09 | 东莞市热恒注塑科技有限公司 | A kind of device for being used to install oval hot nozzle heating wire |
| CN113211240A (en) * | 2020-01-17 | 2021-08-06 | 宝山钢铁股份有限公司 | Grinding device of hot rolling coiling pinch roll |
-
2011
- 2011-09-02 CN CN2011200234650U patent/CN202106253U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107672115A (en) * | 2017-09-11 | 2018-02-09 | 东莞市热恒注塑科技有限公司 | A kind of device for being used to install oval hot nozzle heating wire |
| CN113211240A (en) * | 2020-01-17 | 2021-08-06 | 宝山钢铁股份有限公司 | Grinding device of hot rolling coiling pinch roll |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120111 Termination date: 20160902 |
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| CF01 | Termination of patent right due to non-payment of annual fee |