CN105689144B - A kind of electrostatic precipitator ash bucket deashing device - Google Patents

A kind of electrostatic precipitator ash bucket deashing device Download PDF

Info

Publication number
CN105689144B
CN105689144B CN201610111372.0A CN201610111372A CN105689144B CN 105689144 B CN105689144 B CN 105689144B CN 201610111372 A CN201610111372 A CN 201610111372A CN 105689144 B CN105689144 B CN 105689144B
Authority
CN
China
Prior art keywords
headwall
ash bucket
air
bucket
neck
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201610111372.0A
Other languages
Chinese (zh)
Other versions
CN105689144A (en
Inventor
张久长
朱炎明
周顺泽
刘建忠
危晓慧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FUJIAN SHAOHUA CHEMICAL CO LTD
Original Assignee
FUJIAN SHAOHUA CHEMICAL CO LTD
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FUJIAN SHAOHUA CHEMICAL CO LTD filed Critical FUJIAN SHAOHUA CHEMICAL CO LTD
Priority to CN201610111372.0A priority Critical patent/CN105689144B/en
Publication of CN105689144A publication Critical patent/CN105689144A/en
Application granted granted Critical
Publication of CN105689144B publication Critical patent/CN105689144B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/88Cleaning-out collected particles

Landscapes

  • Electrostatic Separation (AREA)

Abstract

The present invention provides a kind of electrostatic precipitator ash bucket deashing device for avoiding local dust stratification and reentrainment of dust situation, including ash bucket, jet mechanism and suction mechanism, the ash bucket includes headwall and bucket neck, the jet mechanism includes air jet pipe, the suction mechanism includes air intake duct, the air jet pipe is connected with headwall, and the nozzle direction and headwall of the air jet pipe are into 45~60 degree;The air entry of the air intake duct communicates with the outlet for the neck that struggles against.The beneficial effects of the present invention are:By setting air jet pipe on headwall, the nozzle of air jet pipe and headwall are into 45~60 degree of angles, the compressed air of ejection can be made to form the viscous ash decline for being vortexed and driving on headwall, viscous ash on headwall everywhere is all taken away by vortex, avoid being not likely to produce airborne dust while local dust stratification, the radius that dust declines process mesoscale eddies is gradually reduced with ash bucket radius, until dust is brought into bucket neck, the air intake duct that a small amount of airborne dust is exported by the neck that struggles against siphons away, and will not be discharged together with flue gas.

Description

A kind of electrostatic precipitator ash bucket deashing device
Technical field
The present invention relates to electrostatic dust collection equipment field, specifically a kind of electrostatic precipitator ash bucket deashing device.
Background technology
Electrostatic precipitation ash bucket is commonly installed bunker wall vibration device (as shown in Figure 1) in the prior art, by being hit to bulkhead Beat, using resonance principle, prevent and exclude " blocking ", " taking arch " caused by the reason such as the internal friction due to ash material, deliquescence, powered Phenomenon, it is ensured that ash material is smoothly discharged from grey Hatch Opening.
But in practice, it has been found that vibrator 18 is attached to headwall 1 and impacted, easily cause ash silo by long-term use Deform, the welding seam breaking of slight crack or tear, vibrator pedestal and headwall occur, and then cause vibrator burn-down of electric motor, influence Production, or even trigger accident.
Because the adhesiveness of flue dust differs, flue dust adhesiveness is strong, is advantageous to be adhered on headwall, but needs bigger rapping Power could be removed;Adhesiveness is low, is advantageous to rapping removing, but easily cause reentrainment of dust.Moreover, secondary the raising because of rapping initiation Dirt can be discharged together with flue gas, and electrostatic precipitation effect is had a greatly reduced quality.
Publication No. CN203437215U utility model patent discloses a kind of electrostatic precipitator ash bucket jet deashing dress Put, in use, by a total source of the gas of valve opening factory, compressed gas is transported to the zinc-plated branch pipe of first layer and second from house steward In the zinc-plated branch pipe of layer, then it is transported in six shower nozzles of first group of shower nozzle and is sprayed by the zinc-plated branch pipe of first layer, wherein four Shower nozzle carries out emphasis removing to the dust stratification at four angles of the sub- ash bucket where itself, and two other shower nozzle is used for other easy dust stratifications Position deashing, also, because the height of the zinc-plated branch pipe of the second layer is higher than the height of the zinc-plated branch pipe of the first layer, so as to difference Dust stratification in altitude range is purged.In the device, the position of first group of shower nozzle and second group of shower nozzle is to set down, to the greatest extent Pipe is provided with multiple shower nozzles, but the position also having unavoidably can not be directed onto, so as to cause local dust stratification.Although avoid rapping side Destruction of the formula to ash bucket, but, the viscous ash of grey headwall produce reentrainment of dust due to shower nozzle down under the impact of air-flow, airborne dust with Fume emission influences dust removing effects.Moreover, 4 all pipelines are arranged in ash bucket so that dust stratification on house steward and branch pipe without Method is removed, and the time has grown easy exacerbation pipe loadings, influenceed the normal use of pipeline.
The content of the invention
The technical problems to be solved by the invention are:A kind of electrostatic for avoiding local dust stratification and reentrainment of dust situation is provided Dust collector ash hopper deashing device.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is:A kind of electrostatic precipitator ash bucket deashing dress Put, including ash bucket, jet mechanism and suction mechanism, the ash bucket include headwall and bucket neck, the jet mechanism includes air jet pipe, The suction mechanism includes air intake duct, and the air jet pipe is connected with headwall, the nozzle direction of the air jet pipe and headwall into 45~ 60 degree;The air entry of the air intake duct communicates with the outlet for the neck that struggles against.
The beneficial effects of the present invention are:By setting air jet pipe on headwall, the nozzle of air jet pipe and headwall into 45~ 60 degree of angles, the compressed air of ejection can be made to form the viscous ash being vortexed on drive headwall and declined, the viscous ash on headwall everywhere is all by whirlpool Rotation is taken away, and avoids being not likely to produce airborne dust while local dust stratification, and the radius that dust declines process mesoscale eddies is gradual with ash bucket radius Reduce, until dust is brought into bucket neck, the air intake duct that a small amount of airborne dust is exported by the neck that struggles against siphons away, will not be with flue gas together Discharge.
Brief description of the drawings
Fig. 1 is the structural representation of the electrostatic precipitator ash bucket deashing device of prior art.
Fig. 2 is the structural representation of electrostatic precipitator ash bucket deashing device of the embodiment of the present invention.
Label declaration:
1st, headwall;2nd, struggle against neck;31st, nozzle;32nd, house steward;33rd, branch pipe;4th, air compressor;5th, air intake duct;6th, work is flat Platform;7th, electric expansion section;8th, hand operated gate valve;9th, cage set;10th, alloyed steel elastic circle;11st, cross centre frame;12nd, hanger; 13rd, motor hoist;14th, steel wire rope;15th, fixed pulley;16th, conduit;17th, hand-operated lifting controller;18th, vibrator.
Embodiment
To describe the technology contents of the present invention, the objects and the effects in detail, below in conjunction with embodiment and coordinate attached Figure is explained.
The design of most critical of the present invention is:The nozzle of air jet pipe, into 45~60 degree of angles, can make the compression of ejection with headwall Air, which forms to be vortexed, drives the viscous ash on headwall to decline, and the viscous ash on headwall everywhere is all taken away by vortex, avoids local dust stratification It is not likely to produce airborne dust simultaneously.
Fig. 2, a kind of electrostatic precipitator ash bucket deashing device, including ash bucket, jet mechanism and suction mechanism are refer to, it is described Ash bucket includes headwall 1 and bucket neck 2, and the jet mechanism includes air jet pipe, and the suction mechanism includes air intake duct 5, the jet Pipe is connected with headwall, and the direction of nozzle 31 of the air jet pipe and headwall are into 45~60 degree;The air entry of the air intake duct and bucket neck Outlet communicate.
It was found from foregoing description, the beneficial effects of the present invention are:By setting air jet pipe, the spray of air jet pipe on headwall Mouth, into 45~60 degree of angles, can make 0.4~0.6MPa of ejection compressed air form the viscous ash for being vortexed and driving on headwall with headwall Decline, the viscous ash on headwall everywhere is all taken away by vortex, avoids being not likely to produce airborne dust while local dust stratification, and dust declines process The radius of mesoscale eddies is gradually reduced with ash bucket radius, until dust is brought into bucket neck, a small amount of airborne dust is by struggling against what neck exported Air intake duct siphons away, and will not be discharged together with flue gas.
Further, the air jet pipe includes house steward 32 and more than two branch pipes 33, and the house steward is connected with branch pipe, institute State house steward to be arranged on outside ash bucket, the branch pipe is extend into ash bucket by ash bucket outer wall, and the outlet of the branch pipe is nozzle.
Seen from the above description, house steward is arranged on outside ash bucket, is avoided ash bucket interior conduit from gathering and is caused ash bucket to fall on pipeline And aggravate pipeline burden.
Further, the top of the bucket neck is provided with through hole, and the air intake duct is entered in bucket neck through the through hole, institute The air entry for stating air intake duct is concordant with the outlet for the neck that struggles against.
Seen from the above description, air intake duct is stretched into by bucket neck top, until the outlet of the air entry of air intake duct and the neck that struggles against is put down Together, the less dust of particle in bucket neck can be made to be siphoned away by air intake duct, avoided as flue gas discharges together.
Further, the jet mechanism also includes air compressor 4, and air jet pipe one end is connected with headwall, and air jet pipe is another One end is connected with air compressor.
Further, the suction mechanism also includes electrostatic precipitator, and air intake duct one end is connected with bucket neck, and air intake duct is another End is connected with electrostatic precipitator.
Seen from the above description, air intake duct uses above-mentioned connected mode, can improve the utilization rate of electrostatic precipitator.
Further, in addition to workbench 6, the headwall are located above workbench, and the bucket neck is put down positioned at work Below platform.
Seen from the above description, because viscous ash most in ash bucket is all on headwall, headwall is arranged on work and put down Above platform, bucket neck is arranged on below workbench, can mitigate the burden of whole ash bucket, and the viscous ash on headwall can smoothly be fallen.
Further, in addition to electric expansion section 7, the electric expansion section are arranged on outside bucket neck, and the one of the air intake duct End is out of the top of electric expansion section (bottom of hand operated gate valve 8) insertion electric expansion section.The insertion depth of the air intake duct For the 60%-70% of the normal engineering length of electric expansion section.The air intake duct has two, and two dust suction tracheaes are with electric expansion The central shaft of section is that symmetry axis is symmetrical.Pressure regulation is provided with the air intake duct and the connecting line of electrostatic precipitator Valve.The body exterior of the electric expansion section is the cage set 9 that material is terylene pin felt cotton, and inner skeleton is the alloy steel bomb of layering Property circle 10, cage set sewing is fixed on alloyed steel elastic circle and forms one with alloyed steel elastic circle can upper and lower telescopic movable Single unit system, the foot of cage set be a cross centre frame 11, and the geometric center of the cross centre frame is welded There is a hanger 12.Also include motor hoist 13 (power about 750W, more than 100 kilograms of single hook lift heavy), the electricity Dynamic elevator is realized to the electric expansion section direction of motion by steel wire rope 14 and several fixed fixed pulleys 15 and conduit 16 Control.
During work, bulk cement storage tank is arranged on above ash bucket, and bucket neck is connected with the outlet of headwall, and electric expansion section is arranged on bucket Outside neck, the junction of bucket neck and headwall is provided with hand operated gate valve, and air intake duct is connected with the import of electrostatic precipitator, so as to To adsorb the dust that the particle that may escape is small originally., can be according to grey tank car due to being provided with electric expansion section outside bucket neck The length of the difference (grey tank car vehicle body height is different) of itself work loading height, the manually regulation of lifting controller 17 electric expansion section Degree, the height of ash is freely controlled down, make the outlet of bucket neck and grey tank car charging aperture slitless connection as far as possible, reduce flour dust overflow.
Seen from the above description, electric expansion section is installed outside ash discharging pipe, according to the difference of itself work loading height of grey tank car (grey tank car vehicle body height is different), by adjusting the length of electric expansion section, the height of ash is freely controlled down, makes bucket neck as far as possible Outlet and grey tank car charging aperture slitless connection, reduce flour dust overflow.Air intake duct is set in ash discharging pipe simultaneously, and by air intake duct It is connected with the import of electrostatic precipitator, so as to adsorb the dust that the particle that may escape is small originally, both without increase Cleaner, dust leakage can be effectively prevented again, avoid ash bucket surrounding environment that dust occurs while production technology is met Pollution, and improves the utilization rate of electrostatic precipitator, have simple in construction, cost is cheap, energy-saving and emission-reduction, good dustproof effect etc. Advantage.
Fig. 2 is refer to, embodiments of the invention are:A kind of electrostatic precipitator ash bucket deashing device, including ash bucket, jet plane Structure and suction mechanism, the ash bucket include headwall 1 and bucket neck 2, and the jet mechanism includes air jet pipe, and the suction mechanism includes Air intake duct 5, the air jet pipe are connected with headwall, and the direction of nozzle 31 of the air jet pipe and headwall are into 45~60 degree;The air-breathing The air entry of pipe communicates with the outlet for the neck that struggles against.The air jet pipe includes house steward 32 and more than two branch pipes 33, the house steward with Branch pipe is connected, and the house steward is arranged on outside ash bucket, and the branch pipe is extend into ash bucket by ash bucket outer wall, and the outlet of the branch pipe is For nozzle.The top of the bucket neck is provided with through hole, and the air intake duct is entered in bucket neck through the through hole, the air intake duct Air entry is concordant with the outlet for the neck that struggles against.The jet mechanism also includes air compressor 4, and air jet pipe one end is connected with headwall, spray The tracheae other end is connected with air compressor.The suction mechanism also includes electrostatic precipitator, and air intake duct one end is connected with bucket neck, The air intake duct other end is connected with electrostatic precipitator.Also include workbench 6, the headwall is located above workbench, the bucket Neck is located at below workbench.Also include electric expansion section 7, the electric expansion section is arranged on outside bucket neck, the air intake duct One end is out of the top of electric expansion section (bottom of hand operated gate valve 8) insertion electric expansion section.The insertion of the air intake duct is deep Spend the 60%-70% of the normal engineering length for electric expansion section.The air intake duct has two, and two dust suction tracheaes are stretched with electronic The central shaft of casing coupling is that symmetry axis is symmetrical.Pressure regulation is provided with the air intake duct and the connecting line of electrostatic precipitator Valve.The body exterior of the electric expansion section is the cage set 9 that material is terylene pin felt cotton, and inner skeleton is the alloy steel bomb of layering Property circle 10, cage set sewing is fixed on alloyed steel elastic circle and forms one with alloyed steel elastic circle can upper and lower telescopic movable Single unit system, the foot of cage set be a cross centre frame 11, and the geometric center of the cross centre frame is welded There is a hanger 12.Also include motor hoist 13 (power 750W, more than 100 kilograms of single hook lift heavy), the electronic lifting Machine realizes the control to the electric expansion section direction of motion by steel wire rope 14 and several fixed fixed pulleys 15 and conduit 16.
In summary, the beneficial effect of electrostatic precipitator ash bucket deashing device provided by the invention is:By in headwall Upper setting air jet pipe, the nozzle of air jet pipe and headwall can make 0.4~0.6MPa of ejection compressed air shape into 45~60 degree of angles The viscous ash on headwall is driven to decline into being vortexed, the viscous ash on headwall everywhere is all taken away by vortex, while avoiding local dust stratification not Airborne dust is also easy to produce, the radius that dust declines process mesoscale eddies is gradually reduced with ash bucket radius, until dust is brought into bucket neck, it is few The air intake duct that the airborne dust of amount is exported by the neck that struggles against siphons away, and will not be discharged together with flue gas;House steward is arranged on outside ash bucket, avoids ash Bucket interior conduit, which gathers, causes ash bucket to fall on pipeline and aggravate pipeline burden;Headwall is arranged on above workbench, bucket neck is set Put below workbench, can mitigate the burden of whole ash bucket, the viscous ash on headwall can smoothly be fallen;Electricity is installed outside ash discharging pipe Dynamic telescopic joint, according to the difference of itself work loading height of grey tank car, by adjusting the length of electric expansion section, freely control down ash Highly, make the outlet of bucket neck and grey tank car charging aperture slitless connection as far as possible, reduce flour dust overflow.Set simultaneously in ash discharging pipe Air intake duct, and air intake duct is connected with the import of electrostatic precipitator, it is small so as to adsorb the particle that may be escaped originally Dust, need not both increase cleaner, can effectively prevent dust leakage again, ash bucket is avoided while production technology is met Dust pollution occurs for surrounding environment, and improves the utilization rate of electrostatic precipitator, has that simple in construction, cost is cheap, energy-conservation The advantages that emission reduction, good dustproof effect.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair The equivalents that bright specification and accompanying drawing content are made, or the technical field of correlation is directly or indirectly used in, similarly include In the scope of patent protection of the present invention.

Claims (6)

  1. A kind of 1. electrostatic precipitator ash bucket deashing device, it is characterised in that:It is described including ash bucket, jet mechanism and suction mechanism Ash bucket includes headwall and bucket neck, and the jet mechanism includes air jet pipe, and the suction mechanism includes air intake duct, the air jet pipe and Headwall is connected, and with headwall into 45~60 degree, the nozzle direction is set the nozzle direction of the air jet pipe upward;The air intake duct Air entry with struggle against neck outlet communicate.
  2. 2. electrostatic precipitator ash bucket deashing device according to claim 1, it is characterised in that:The air jet pipe includes house steward With more than two branch pipes, the house steward is connected with branch pipe, and the house steward is arranged on outside ash bucket, and the branch pipe is stretched by ash bucket outer wall Enter into ash bucket, the outlet of the branch pipe is nozzle.
  3. 3. electrostatic precipitator ash bucket deashing device according to claim 1, it is characterised in that:The top of the bucket neck is provided with Through hole, the air intake duct are entered in bucket neck through the through hole, and the air entry of the air intake duct is concordant with the outlet for the neck that struggles against.
  4. 4. electrostatic precipitator ash bucket deashing device according to claim 1, it is characterised in that:The jet mechanism also includes Air compressor, air jet pipe one end are connected with headwall, and the air jet pipe other end is connected with air compressor.
  5. 5. electrostatic precipitator ash bucket deashing device according to claim 1, it is characterised in that:The suction mechanism also includes Electrostatic precipitator, air intake duct one end are connected with bucket neck, and the air intake duct other end is connected with electrostatic precipitator.
  6. 6. electrostatic precipitator ash bucket deashing device according to claim 1, it is characterised in that:Also include workbench, institute State headwall to be located above workbench, the bucket neck is located at below workbench.
CN201610111372.0A 2016-02-29 2016-02-29 A kind of electrostatic precipitator ash bucket deashing device Active CN105689144B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610111372.0A CN105689144B (en) 2016-02-29 2016-02-29 A kind of electrostatic precipitator ash bucket deashing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610111372.0A CN105689144B (en) 2016-02-29 2016-02-29 A kind of electrostatic precipitator ash bucket deashing device

Publications (2)

Publication Number Publication Date
CN105689144A CN105689144A (en) 2016-06-22
CN105689144B true CN105689144B (en) 2017-11-17

Family

ID=56222630

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610111372.0A Active CN105689144B (en) 2016-02-29 2016-02-29 A kind of electrostatic precipitator ash bucket deashing device

Country Status (1)

Country Link
CN (1) CN105689144B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113082891B (en) * 2021-04-13 2022-07-01 泰安福星汽车配件有限公司 Energy-saving air separation plant compression system self-cleaning filter

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011212509A (en) * 2010-03-31 2011-10-27 Chugoku Electric Power Co Inc:The Dust collector
CN102423727B (en) * 2011-11-21 2014-02-05 济钢集团有限公司 Sintering machine head dust removing and ash conveying device and use method thereof
CN202343327U (en) * 2011-12-12 2012-07-25 青岛威特水煤浆技术开发有限公司 Electrostatic precipitator dust fall system
CN202377101U (en) * 2011-12-29 2012-08-15 中国铝业股份有限公司 Electric dust collector
CN202605921U (en) * 2012-05-11 2012-12-19 武汉钢铁(集团)公司 Dust-blowing device for ash hopper of dust-removing device
CN102836600A (en) * 2012-09-04 2012-12-26 云南智奇工程技术有限公司 High-pressure remote dust and ash remover
CN102962138B (en) * 2012-11-20 2015-09-09 天脊煤化工集团股份有限公司 The defeated ash silo of process electrostatic precipitation blocks up method and the device of ash
CN203437215U (en) * 2013-07-30 2014-02-19 河南华润电力古城有限公司 Air injection type deashing device for ash hopper of electrostatic dust collector
CN204122254U (en) * 2014-08-12 2015-01-28 红塔烟草(集团)有限责任公司楚雄卷烟厂 The electrostatic precipitation cinerary device improved

Also Published As

Publication number Publication date
CN105689144A (en) 2016-06-22

Similar Documents

Publication Publication Date Title
CN109552905A (en) Dust unloads ash trapping integrated apparatus
CN202186763U (en) Dump car system with telescopic chute
CN105689144B (en) A kind of electrostatic precipitator ash bucket deashing device
CN202400593U (en) Micro power dust removal device
CN110980341A (en) Ship unloaders dry fog presses down dirt system
CN208229567U (en) It is a kind of with the deduster that structure is preliminarily sprayed
CN207193320U (en) A kind of gravity blast furnace dust catcher ash hole transforms device
CN211444296U (en) Coal fired power plant boiler slag storehouse sediment dust removal structure of unloading
CN102745510A (en) Pneumatic hoisting and emptying device of finished product cabin
CN206969772U (en) A kind of screw ship unloader with vertical telescopic strength feeding head
CN212150387U (en) Bucket elevator prevents long-pending material device
CN206278514U (en) A kind of jumbo bag packing device
CN205555597U (en) Dust removal funnel
CN208913882U (en) Ball blast robot
CN209567418U (en) A kind of drying tower elevator being easily installed
CN205383622U (en) A lower glassware for boiler ash conveying system
CN208944338U (en) A kind of sodium bicarbonate grinding device
CN210938822U (en) Waste sand collecting device after sand blasting of sand blasting room
CN2402646Y (en) Pneumatic storehouse bottom bulk cement loader
CN209635491U (en) A kind of high-efficiency dustless ashes bulk machine
CN209174185U (en) A kind of Coal Transport device depositing dust spraying system
CN209242206U (en) A kind of dedusting ash puts ash system automatically
CN208603353U (en) A kind of Pneumatic conveyer and transportation system of material
CN211134912U (en) Wind power dust removing device for machine-made sand
CN113041769A (en) Mining dust collector

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant