CN107649386A - The special powder concentrator of sandstone - Google Patents
The special powder concentrator of sandstone Download PDFInfo
- Publication number
- CN107649386A CN107649386A CN201710899187.7A CN201710899187A CN107649386A CN 107649386 A CN107649386 A CN 107649386A CN 201710899187 A CN201710899187 A CN 201710899187A CN 107649386 A CN107649386 A CN 107649386A
- Authority
- CN
- China
- Prior art keywords
- separation chamber
- powder concentrator
- sandstone
- cone
- connection
- 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.)
- Pending
Links
- 239000000843 powder Substances 0.000 title claims abstract description 52
- 238000000926 separation method Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 239000013590 bulk material Substances 0.000 claims abstract description 17
- 239000000428 dust Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 241000216843 Ursus arctos horribilis Species 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 25
- 238000001035 drying Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 6
- 239000004575 stone Substances 0.000 abstract description 6
- 238000000227 grinding Methods 0.000 abstract description 4
- 239000011230 binding agent Substances 0.000 abstract description 3
- 239000004576 sand Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/02—Arrangement of air or material conditioning accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/06—Feeding or discharging arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a kind of special powder concentrator of sandstone, including powder concentrator main body, blower fan, cyclone dust collectors, powder concentrator main body includes separation chamber, feed bin room, separation chamber connection blast pipe, discharge pipe, connection feed pipe above separation chamber, lower section binder bin, feed bin room bottom is provided with coarse fodder outlet pipe；Rotating shaft is provided with separation chamber center, burden-guiding cone, heating cone, spiral bulk material device are sequentially provided with inside separation chamber from top to bottom, burden-guiding cone is fixedly connected in rotating shaft, and heating cone is fixedly connected on separation chamber locular wall, heating cone connection heater, spiral bulk material device are fixedly connected in rotating shaft.The setting of heating cone and heater is reasonable in the present invention, accelerates the drying to material, ensures that water content is less than 2% so that powder concentrator can effectively play its efficiency, and stone powder padding efficiency is preferable；Selection by winnowing effect is good, and sandstone effectively sorts, and grinding efficiency is high, and particle size range is small, effectiveness of classification is high.
Description
Technical field
The present invention relates to powder concentrator device field, specially a kind of special powder concentrator of sandstone.
Background technology
Powder concentrator is to aim at sandstone roll squeezer or the matching used static rank bale breaking equipment of ball mill, roll squeezer or ball milling
The material particles distribution that machine crushes out is very wide, after selecting powder by powder concentrator, first at sorting, can directly obtain into fine grained
Product, and bulky grain goes successively to roll squeezer or ball mill is crushed again.Because fine grained is separated in advance, enter
The material particles of roll squeezer or ball mill are more uniformly neat, and the mill efficiency of system greatly improves, and is advantageous to roll squeezer or ball
The even running of grinding machine, system throughput is improved, and there is drying function.At present, in building materials and metallurgy industry, powder concentrator is due to it
Have material scattering, drying, the function of classification concurrently, various grinding process systems can be formed with equipment such as roll squeezer or Vertical Mills,
Building materials, cement industry are widely used.
Sand material accounts for 80% of weight concrete or so in concrete, therefore Preservation for Aggregate Production System is weight prepared by concrete
Core is wanted to form, and technology for making sand is then the core process in sandstone processing, existing technology for making sand is that sandstone is passed through into pressure roller
Machine pressure roller, then selects powder through powder concentrator, selects qualified sand powder.Supplied materials flow, content of stone powder, the moisture content of roughing sand are all shadows
An important factor for powder concentrator selects powder ability and selects powder effect is rung, when feeding moisture content 2%, powder concentrator can effectively play it
Efficiency, stone powder padding efficiency is preferable, reclaims the particle size content of stone flour（More than 0.16mm）During less than 15%, successive projects can be met
Stone flour need.Problems with when in use be present in the existing special powder concentrator of sandstone：Water content be higher than 2% when, material easily into
Stick together, when falling within into the material to stick together on bulk cargo vertebra, sandstone is not easy to be thrown scattered, and fine powder is not easy to be entrained by the flow of air, and has had a strong impact on point
Select effect.In the prior art the high sandstone of water content is dried or excludes in order to control the water content of charging typically to be concentrated using raw material
Heap, cause the waste of raw material using these measures and extend the working time.Therefore a kind of special powder concentrator of sandstone is continued, effectively
The higher sandstone material of processing water content, improve selection by winnowing effect.
The content of the invention
To solve the above problems, the invention discloses a kind of special powder concentrator of sandstone.
In order to reach object above, the present invention provides following technical scheme：
A kind of special powder concentrator of sandstone, including powder concentrator main body, blower fan, cyclone dust collectors, the powder concentrator main body include selection by winnowing
Room, feed bin room, the separation chamber top connect blast pipe, top connection discharge pipe, blast pipe connecting fan, discharge pipe connection rotation
Wind deduster, the cyclone dust collectors are provided with fines outlet pipe；Connection feed pipe above the separation chamber, lower section binder bin,
Feed bin room bottom is provided with coarse fodder outlet pipe；It is characterized in that：Rotating shaft is provided with separation chamber center, the rotating shaft connects motor,
The motor is located above powder concentrator main body；Burden-guiding cone, heating cone, spiral are sequentially provided with inside the separation chamber from top to bottom to dissipate
Expect device, the burden-guiding cone is fixedly connected in rotating shaft, and the heating cone is fixedly connected on separation chamber locular wall, the heating cone
Heater is connected, the heater is located on the outside of separation chamber locular wall, and the heater includes semiconductor heating body, positioned at semiconductor
Thermally conductive sheet, the cool guide sheet positioned at semiconductor heating body opposite side of body side are heated, the thermally conductive sheet connects through separation chamber locular wall
Connect heating cone；The spiral bulk material device is fixedly connected in rotating shaft.
Further, the heater includes 4, and is circumferentially evenly distributed in the outside of separation chamber locular wall.
Further, the spiral bulk material device includes upper garter spring, lower garter spring, grizzly bar, the upper garter spring and lower garter spring it
Between be uniformly provided with grizzly bar, the upper garter spring, lower garter spring are connected by connecting rod be fixedly connected with rotating shaft respectively.Spiral bulk material device
It is arranged to the detachable cagelike structure of split-type, has saved maintenance difficulties, bulk cargo is uniform, and effective water conservancy diversion, guide.
Further, the lower garter spring bottom connection flow deflector, the skewed Spiral distribution of flow deflector is on lower garter spring.Lead
The effective wind-guiding of flow, cloth wind so that the distribution for the air-flow uniform spiral that air inlet enters.
Further, the air outlet of the cyclone dust collectors and the air inlet of blower fan connect to form closure air-flow by airduct
Circulation.
Further, the coarse fodder outlet pipe and fines outlet pipe are provided with duplex air valve.Air valve greatly reduces air leak rate of air curtain,
Overcome the shortcomings that airborne dust is big in grader rotation process.
The present invention operation principle be：Gas, powder are mixed, form Dual-Phrase Distribution of Gas olid, the spiral bulk material device and height of rotation
Fast air-flow makes pulverized coal borne air flow obtain centrifugal force when rotated, and the centrifugal force difference that different-grain diameter particle obtains is so as to realizing thickness powder
The separation of grain, while thickness powder is reclaimed respectively.The course of work of the present invention：Top feed pipe of the material from powder concentrator
Input, falls on the burden-guiding cone being connected with rotating shaft, and burden-guiding cone breaks up material under the rotation of rotating shaft, and material is fallen on to be connected with locular wall
On the heating cone connect, heating cone is heated by heater, and it is higher to heat the temperature of cone, by thermal convection current, heat transfer dried material, makes
The water content for obtaining material reaches predetermined requirement；The setting of burden-guiding cone and heating cone can also extend material in separation chamber simultaneously
Residence time, accelerate the drying of material；Material is fallen subsequently into spiral bulk material device, is radially got rid of under the influence of centrifugal force
Go out, air-flow of the material with upper rotation in separating chamber meets, the fine grained in material because quality is small and with air-flow rise via with turn
The grizzly bar classification of son rotation, qualified fine powder continue to ascend into cyclone dust collectors, fallen into after cyclone cylinder is collected through grizzly bar
Exported to the ash bucket of deduster from fines outlet pipe；Remove the air after fine powder and then return to blower fan formation gas from deduster through airduct
Flow closed cycle；Coarse granule because quality it is larger in the presence of spiral bulk material device with thin feed separation, whereabouts, from coarse fodder outlet pipe
Discharge.
Beneficial effects of the present invention：1st, the setting of heating cone and heater is reasonable, accelerates the drying to material, ensures aqueous
Amount is less than 2% so that powder concentrator can effectively play its efficiency, and stone powder padding efficiency is preferable；2nd, the cooperation of burden-guiding cone and heating cone
Set, extend residence time of the material in separation chamber, on the one hand may be such that material dispersion evenly, on the other hand may be such that thing
Expect that rate of drying is accelerated；3rd, selection by winnowing effect is good, and sandstone effectively sorts, and grinding efficiency is high, and particle size range is small, effectiveness of classification is high.
Brief description of the drawings
Fig. 1, the structural representation of the embodiment of the present invention 1；
Fig. 2, embodiment 1 bulk material device flow deflector structure schematic diagram；
Fig. 3, embodiment 1 heater structure schematic diagram.
Wherein：Powder concentrator main body 100, blower fan 200, cyclone dust collectors 300, separation chamber 1, feed bin room 2, blast pipe 3, air-out
Pipe 4, fines outlet pipe 5, feed pipe 6, coarse fodder outlet pipe 7, rotating shaft 8, motor 9, burden-guiding cone 10, heating cone 11, spiral bulk material device 12,
Upper garter spring 121, lower garter spring 122, grizzly bar 123, flow deflector 124, heater 13, semiconductor heating body 131, thermally conductive sheet 132, conduction cooling
Piece 133.
Embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following embodiments are only
For illustrating the present invention rather than limitation the scope of the present invention.
As shown in Figure 1, Figure 2, Figure 3 shows, the special powder concentrator of a kind of sandstone, including powder concentrator main body 100, blower fan 200, whirlwind remove
Dirt device 300, powder concentrator main body include separation chamber 1, feed bin room 2, separation chamber top connection blast pipe 3, and top connects discharge pipe 4,
Blast pipe connecting fan, discharge pipe connection cyclone dust collectors, cyclone dust collectors are provided with fines outlet pipe 5；Connect above separation chamber into
Expects pipe 6, lower section binder bin, feed bin room bottom are provided with coarse fodder outlet pipe 7.Material enters from feed pipe, after separation chamber selection by winnowing,
Thick material ability coarse fodder outlet pipe discharge, thin material are discharged through fines outlet pipe.In the present embodiment, the air outlet and wind of cyclone dust collectors
The air inlet of machine connects to form closure airflow circulating by airduct.
Further, it is provided with duplex air valve in coarse fodder outlet pipe and fines outlet pipe.Air valve greatly reduces air leak rate of air curtain, gram
The shortcomings that airborne dust is big in grader rotation process is taken.
Rotating shaft 8, rotating shaft connection motor 9 are provided with separation chamber center, motor is located above powder concentrator main body；The transmission of motor
Axle is provided with small pulley, and small pulley connects the big belt wheel in rotary shaft, the rotation of motor driven rotating shaft by belt.
Burden-guiding cone 10, heating cone 11, spiral bulk material device 12 are sequentially provided with inside separation chamber from top to bottom, burden-guiding cone is fixed
It is connected in rotating shaft, heating cone is fixedly connected on separation chamber locular wall inner side, and heating cone connection heater 13, heater is located at wind
Select on the outside of the locular wall of room, heater includes semiconductor heating body 131, the thermally conductive sheet 132 positioned at semiconductor heating body side, positioned at half
Conductor heats the cool guide sheet 133 of body opposite side, and thermally conductive sheet is bored through the connection heating of separation chamber locular wall.Select and partly lead in the present invention
System backing heating effect is good, and heat conductivility is strong, can quickly heat heat conduction.In the present embodiment, heater includes 4,
And circumferentially it is evenly distributed in the outside of separation chamber locular wall.
Spiral bulk material device is fixedly connected in rotating shaft, in the present embodiment, spiral bulk material device include upper garter spring 121,
Lower garter spring 122, grizzly bar 123, are uniformly provided with grizzly bar between upper garter spring and lower garter spring, upper garter spring, lower garter spring pass through connecting rod respectively
Connection is fixedly connected with rotating shaft.Spiral bulk material device is arranged to the detachable cagelike structure of split-type, has saved maintenance difficulties, bulk cargo
Uniformly, and effective water conservancy diversion, guide.
Further, flow deflector 124 is connected in lower garter spring bottom, the skewed Spiral distribution of flow deflector is on lower garter spring.
The effective wind-guiding of flow deflector, cloth wind so that the distribution for the air-flow uniform spiral that air inlet enters.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, in addition to
Formed technical scheme is combined by above technical characteristic.It should be pointed out that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (6)
1. a kind of special powder concentrator of sandstone, including powder concentrator main body, blower fan, cyclone dust collectors, the powder concentrator main body include wind
Room, feed bin room are selected, the separation chamber top connects blast pipe, top connection discharge pipe, blast pipe connecting fan, discharge pipe connection
Cyclone dust collectors, the cyclone dust collectors are provided with fines outlet pipe；Connection feed pipe above the separation chamber, lower section connection feed bin
Room, feed bin room bottom are provided with coarse fodder outlet pipe；It is characterized in that：Rotating shaft, the rotating shaft connection electricity are provided with separation chamber center
Machine, the motor are located above powder concentrator main body；Burden-guiding cone, heating cone, spiral shell are sequentially provided with inside the separation chamber from top to bottom
Bulk material device is revolved, the burden-guiding cone is fixedly connected in rotating shaft, and the heating cone is fixedly connected on separation chamber locular wall, described to add
Heat cone connection heater, the heater are located on the outside of separation chamber locular wall, and the heater includes semiconductor heating body, positioned at half
Thermally conductive sheet, the cool guide sheet positioned at semiconductor heating body opposite side of conductor heating body side, the thermally conductive sheet pass through separation chamber room
Wall connection heating cone；The spiral bulk material device is fixedly connected in rotating shaft.
A kind of 2. special powder concentrator of sandstone as claimed in claim 1, it is characterised in that：The heater includes 4, and in circle
It is evenly distributed in the outside of separation chamber locular wall week.
A kind of 3. special powder concentrator of sandstone as claimed in claim 1, it is characterised in that：The spiral bulk material device includes upper hoop
Ring, lower garter spring, grizzly bar, are uniformly provided with grizzly bar between the upper garter spring and lower garter spring, the upper garter spring, lower garter spring pass through company respectively
Extension bar connection is fixedly connected with rotating shaft.
A kind of 4. special powder concentrator of sandstone as claimed in claim 3, it is characterised in that：The lower garter spring bottom connection water conservancy diversion
Piece, the skewed Spiral distribution of flow deflector is on lower garter spring.
A kind of 5. special powder concentrator of sandstone as claimed in claim 1, it is characterised in that：The air outlet of the cyclone dust collectors with
The air inlet of blower fan connects to form closure airflow circulating by airduct.
A kind of 6. special powder concentrator of sandstone as claimed in claim 1, it is characterised in that：The coarse fodder outlet pipe and fines outlet pipe are set
There is duplex air valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710899187.7A CN107649386A (en) | 2017-09-28 | 2017-09-28 | The special powder concentrator of sandstone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710899187.7A CN107649386A (en) | 2017-09-28 | 2017-09-28 | The special powder concentrator of sandstone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107649386A true CN107649386A (en) | 2018-02-02 |
Family
ID=61115927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710899187.7A Pending CN107649386A (en) | 2017-09-28 | 2017-09-28 | The special powder concentrator of sandstone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107649386A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108191278A (en) * | 2018-04-02 | 2018-06-22 | 贵州涟江源建材有限公司 | A kind of high performance concrete Machine-made Sand process units |
| CN108339751A (en) * | 2018-03-12 | 2018-07-31 | 滁州广洋湖米业有限公司 | A kind of uniform rice impurity removing equipment of charging |
| CN108722867A (en) * | 2018-05-15 | 2018-11-02 | 包超希 | The pneumatic separation device of dust content in a kind of reduction tealeaves |
-
2017
- 2017-09-28 CN CN201710899187.7A patent/CN107649386A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108339751A (en) * | 2018-03-12 | 2018-07-31 | 滁州广洋湖米业有限公司 | A kind of uniform rice impurity removing equipment of charging |
| CN108191278A (en) * | 2018-04-02 | 2018-06-22 | 贵州涟江源建材有限公司 | A kind of high performance concrete Machine-made Sand process units |
| CN108722867A (en) * | 2018-05-15 | 2018-11-02 | 包超希 | The pneumatic separation device of dust content in a kind of reduction tealeaves |
| CN108722867B (en) * | 2018-05-15 | 2020-09-22 | 福建省仙茶美科技有限公司 | Winnowing device for reducing dust content in tea |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102601375A (en) | Flaky metal powder production process | |
| CN207214663U (en) | A kind of dry dust removal device of titanium dioxide | |
| WO2021093256A1 (en) | Raw material vertical mill external circulation system and process | |
| CN106669888A (en) | Efficient roller pressing grinding station and technique thereof | |
| CN106040405A (en) | Pre-grinding vertical mill united semi-finish grinding system with built-in powder concentrator | |
| CN204866115U (en) | Wet upright crocus of coal -fired slag of arranging grinds drying system | |
| CN109226185A (en) | Paint slag recycling system device and its production technology | |
| CN105080698A (en) | Vertical roller mill system and milling process thereof | |
| CN103992836A (en) | Wood chip smashing system and biomass wood chip granular fuel production equipment comprising same | |
| CN1733365A (en) | Energy-saving environment-friendly type industrial residue closed-circuit high-yield super-fine mill controlling technique and equipment thereof | |
| CN107649386A (en) | The special powder concentrator of sandstone | |
| CN206831955U (en) | Grain dryer with dust removal and impurity removal functions | |
| CN101762147B (en) | Clay mineral drier | |
| CN105562159A (en) | Ultra-fine grinding system for cement production | |
| CN104984910A (en) | High-dispersibility vortex powder selecting machine | |
| CN207357597U (en) | The special powder concentrator of sandstone | |
| CN106622603A (en) | Cement production line fine powder grinding equipment | |
| CN106733064A (en) | A kind of Rotatingandflashstreamingdrier | |
| MXPA97002608A (en) | Efficient production of gypsum calcinated by collection and classification of fine and | |
| CN217989497U (en) | Preparation low moisture ball-milling device of high grinding efficiency for calcium carbonate | |
| CN112844766A (en) | Production method of high-yield pea protein powder by dry method and product | |
| CN209077416U (en) | Paint slag recycling system device | |
| CN110523501A (en) | A kind of full outer circulation raw material vertical mill mill is outer to select powder grinding process system | |
| CN205550427U (en) | Half whole grinding of cement grinds and ball -milling combination system immediately | |
| CN207430394U (en) | The special powder concentrator of coal mill system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180202 |