CN206652609U - A kind of dust arrester - Google Patents
A kind of dust arrester Download PDFInfo
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- CN206652609U CN206652609U CN201720423986.2U CN201720423986U CN206652609U CN 206652609 U CN206652609 U CN 206652609U CN 201720423986 U CN201720423986 U CN 201720423986U CN 206652609 U CN206652609 U CN 206652609U
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- gas
- ash bucket
- dust arrester
- dust
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Abstract
The utility model provides a kind of dust arrester.Dust arrester includes：Body, gas feed, gas vent and ash bucket are provided with body；Being entered by gas feed in body for dusty gas is flowed, and is discharged by gas vent；Anode and negative electrode, are arranged in body, and between gas feed and gas vent, electric field is formed between high voltage power supply device control anode and negative electrode；Each anode is a plate shape being obliquely installed, and anode is tilted to dusty gas flow direction or tilted to the opposite direction of dusty gas flow direction；The lower section of each anode sets the discharge tip of negative electrode, and each discharge tip is located within the scope of the orthographic projection of each anode.The separation of Charged and trapping are assigned to two spaces and completed by dust arrester of the present utility model, prevent reentrainment of dust, greatly improve efficiency of dust collection, dust emission concentration is less than 10mg/m3, realize that low concentration discharges.The other dust arrester is simple in construction, small investment.
Description
Technical field
It the utility model is related to technical field of industrial dust removal, more particularly to a kind of dust arrester.
Background technology
Industrial production can produce dusty gas, and dusty gas will be after dust removal installation removing a large amount of dust be up to standard, Xiang great
Gas discharges.
Electrostatic precipitator is as refined dedusting facility because resistance is small, efficiency of dust collection is high, is used widely heatproof.
Electrostatic precipitator cost is high, processing containing high resistivity dust (>1010~1013 ' Ω .cm) gas when, dedusting
Efficiency reduces, and deduster shakes deashing and produces reentrainment of dust problem, and these limit the application and efficiency of electrostatic precipitator
Further raising.
The improvement direction of electrostatic precipitator has the compound of electrostatic precipitator and sack cleaner, and these improvement, which can improve, to remove
Dirt efficiency.Its shortcoming be the filter bag material of sack cleaner be glass fibre, fluorine it is beautiful this etc., the cloth substantially characterized by cloth
Bag, non-refractory and water, resistance is larger, and while ESP Efficiency is improved, limit electric cleaner uses model
Enclose.
In the prior art, electric cleaner is combined with metal gauze filter, passes through electric precipitation and dust removal by filtration
Compound action, solve processing containing high resistivity dust (>1010~1013 ' Ω .cm) gas when, efficiency of dust collection is significantly
Reduction, deduster rear portion dust collecting electrode shake reentrainment of dust problem caused by deashing, and resistance increase is few, and efficiency of dust collection improves, together
When the advantages of maintaining heatproof.But the metal gauze filter is fixed, and its deashing turns into difficult point, it is impossible to is solved very well clear
Grey problem, dust remover resistance will be increased, reduce equipment advantage.
Utility model content
In order to overcome, reentrainment of dust caused by electric cleaner deashing and efficiency of dust collection can not be improved further in the prior art
The problem of, the utility model provides a kind of dust arrester.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical scheme that：
The utility model provides a kind of dust arrester, including：
Body, gas feed, gas vent and ash bucket are provided with the body；Dusty gas is entered by the gas
Mouth, which enters in the body, to be flowed, and is discharged by the gas vent；
Anode and negative electrode, it is arranged in the body, between the gas feed and gas vent, high voltage supply dress
Put to control and form electric field between the anode and the negative electrode；
Characterized in that,
Each anode be a plate shape being obliquely installed, the anode to the inclination of dusty gas flow direction or to containing
The opposite direction of dirt gas flow direction tilts；
The lower section of each anode sets the discharge tip of the negative electrode, and each discharge tip is located at each anode
Orthographic projection within the scope of.
Furthermore, it is understood that in described dust arrester, the discharge tip of the anode and the negative electrode is in the height direction
Arranged for interval；The anode in each height is arranged in rows along the flow direction of dusty gas, described the moon in each height
The discharge tip of pole is arranged in rows along the flow direction of dusty gas.
Furthermore, it is understood that in described dust arrester, the flowing side of the length direction of the anode and the dusty gas
To vertical.
Furthermore, it is understood that in described dust arrester,
The anode offers through hole along the flow direction of dusty gas.
Furthermore, it is understood that in described dust arrester, a plurality of spoiler is provided with the ash bucket, each spoiler
On be provided with through hole.
Furthermore, it is understood that in described dust arrester, the first end close to the ash bucket of the gas vent is provided with
The choked flow close to the gas vent is crossed in wire netting or grid, the flow direction of wire netting or grid against the dusty gas
Plate.
Furthermore, it is understood that in described dust arrester, in addition to means of deflation, including：
Communicating pipe, connect the side wall of the ash bucket of the close gas vent and the gas vent；
Valve, it is arranged on the communicating pipe；
Screen pack, the communicating pipe is arranged in the opening of one end of the ash bucket.
Furthermore, it is understood that in described dust arrester, in addition to：First deashing device, including：
First transmission device, on the outside of the ash bucket；
Shaft coupling；
First power transmission shaft, for a part inside the ash bucket, another part stretches out the outside of the ash bucket；
Multiple stirring bodies and the first brush, it is fixed on first power transmission shaft；First brush is set against spoiler
Put.
Furthermore, it is understood that in described dust arrester, in addition to：Second deashing device, including：
Second transmission device, positioned at the ash bucket and the outside of the communicating pipe；
Second driving shaft, a part is positioned at the inside of the communicating pipe and passes through the filter screen, described in another part stretching
Communicating pipe；
Second brush, the end of the fixed second driving shaft simultaneously abut the screen pack.
Furthermore, it is understood that in described dust arrester, the shape of anode include straight panel shape, curved surface plate shape or by straight panel and
The irregular shape of curved slab composition
The beneficial effects of the utility model are：Dust arrester of the present utility model assigns to the separation of Charged and trapping
Two spaces are completed, and are prevented reentrainment of dust, are greatly improved efficiency of dust collection, dust emission concentration is less than 10mg/m3, realize low concentration
Discharge.The other dust arrester is simple in construction, small investment.
Brief description of the drawings
Fig. 1 represents the front view of dust arrester in the utility model embodiment；
Fig. 2 represents the top view of dust arrester in the utility model embodiment；
Fig. 3 represents the side view of dust arrester in the utility model embodiment；
Fig. 4 represents the enlarged diagram of M parts in Fig. 1, and a kind of movement locus schematic diagram of Charged；
Fig. 5 represents the enlarged diagram of M parts in Fig. 1, and the movement locus schematic diagram of another Charged；
Fig. 6 represents one of sectional front view of dust arrester in the utility model embodiment；
Fig. 7 represents two of the sectional front view of dust arrester in the utility model embodiment.
Embodiment
To make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and specific implementation
The utility model is described in detail example.
Embodiment 1, referring to figs. 1 to shown in Fig. 7, the utility model provides a kind of dust arrester, including：Body 2, anode
4th, negative electrode 5 and ash bucket 7.Being entered by gas feed 1 in body 2 for dusty gas is flowed, and is discharged by gas vent 6；This
Gas feed 1 and gas vent 6 are provided with body 2；Anode 4 and negative electrode 5, are arranged in body 2, gentle positioned at gas feed 1
Between body outlet 6, high voltage power supply device 3 controls and forms electric field between anode 4 and negative electrode 5；Each anode 4 is an inclination
The plate shape of setting, the anode 4 are tilted to dusty gas flow direction or tilted to the opposite direction of dusty gas flow direction；Often
The lower section of the individual anode 4 sets the discharge tip of the negative electrode 5, and each discharge tip is located at the positive throwing of each anode 4
Within the scope of shadow.
Specifically, in dust arrester of the present utility model, body 2 is internally provided with anode 4 and negative electrode 5, two electricity
Electric field is produced between pole.By the dusty gas that the gas feed 1 of body 2 enters in the internal flow of body 2.Due to each negative electrode 5
Discharge tip be located within the scope of the orthographic projection of anode 4, each anode 4 is to the flow direction of dusty gas or flow direction
Opposite direction tilts, the electric field tilted upward for causing the discharge tip of negative electrode of each anode with setting below to be formed.Each
The discharge tip of negative electrode 5 forms compound field with the anode 4 that its upper and lower is set, so making what each charged dust was subject to
The action direction made a concerted effort of compound electric field force is downwardly directed ash bucket 7.So in the presence of compound electric field force, the dust-laden of flowing
Charged in gas is advanced into the ash bucket 7 connected with body 2 in arrival gas vent 6, and then is collected, so as to rise
The effect of dedusting is arrived.Wherein, the distance between anode 4 that the discharge tip of each negative electrode 5 is set with its top, be less than and its
The distance between anode 4 that lower section is set；Each charged dust is ensure that, the action direction made a concerted effort for the electric field force being subject to is
Downward, to allow the dust in dusty gas to enter in ash bucket 7.Dust arrester of the present utility model is by Charged
Separation and trapping assign to two spaces completion, prevent reentrainment of dust, greatly improve efficiency of dust collection, dust emission concentration is less than
10mg/m3, realize that low concentration discharges.The other dust arrester is simple in construction, small investment.
Shown in embodiment 2, reference picture 4 and Fig. 5, multiple anodes 4 and negative electrode 5 are spaced in height.Multiple Hes of anode 4
Length direction and width arranged for interval of the negative electrode 5 along body 2 are multiple.Anode 4 in each height is along dusty gas
Flow direction is arranged in rows, and the negative electrode 5 in each height is arranged in rows along the flow direction of dusty gas.
Specifically, in the present embodiment, in the body 2 of dust arrester, the dust-laden between gas feed 1 and gas vent 6
Gas is flowed in the horizontal direction, and each anode 4 is obliquely installed, while ash bucket 7 is placed on the surface of the bottom of body 2.Along dust-laden
The horizontally disposed anode 4 of vertical direction of gas flowing, multiple rows of anode 4 is set along dusty gas flow direction.Arranged in vertical direction
There is multi-layered anode 4, in the lower disposed negative electrode 5 of every layer of anode 4.When dusty gas flows through the inside of body 2, can pass through successively
Cross the square formation of multiple anode 4 and negative electrode 5 compositions.Wherein in the vertical direction of dusty gas flow direction, sun is also intervally distributed with
Pole 4 and negative electrode 5, ensure that the dust of dusty gas can be collected after electric field action.
So each negative electrode 5 is less than its distance with corresponding lower anode 4 with the distance of corresponding top anode 4.So,
Multiple anodes 4 and negative electrode 5 form an electrode array, and the dust in dusty gas has repeatedly by charged machine in flow process
Meeting, charged effect are good.Charged is repeatedly accelerated in flow process, can quickly fall into ash bucket 7.
It should be noted that its vertical direction of Anodic 4 along dusty gas flow direction extends to certain length, ensure
Anode 4 can preferably be applied to charged dust so that dust enters ash bucket along A-B paths.If the length direction of anode 4
The flow direction along dusty gas, then the movement locus of most of dust can deflect, it is impossible to by electric field force act on to
In the ash bucket 7 that the bottom of anode 4 is set.
Distinguish an adjacent anode 4 above and below each negative electrode 5, between negative electrode 5 and two adjacent anodes 4 respectively
Form electric field 8 diagonally downward and tilt upward electric field 9.Because the distance of each negative electrode 5 and the anode 4 above it allows in structure
In the range of it is minimum, the coverage of the downward electric field formed between each negative electrode 5 and anode 4 above it is limited in negative electrode 5
Between the inner face of the anode 4 above it in the range of very little, this scope Charged is by upward power and moves upwards (because of the moon
Pole corona, dust charge negative electricity, its direction of motion are opposite with direction of an electric field vertically downward).The Charged moved upwards is by anode 4
Working face stop, therefore, effect of the downward electric field to Charged does not interfere with the Charged outside its scope.
Embodiment 3, as the setting form of an anode 4, each anode 4 is one piece of tabular being obliquely installed, anode 4
Incline direction is the flow direction of dusty gas or the opposite direction of dusty gas flow direction.The anode 4 of tabular is easier to set
Put, as long as ensureing that the discharge tip of each corresponding negative electrode 5 is located within the orthographic projection orientation of anode 4, for each anode 4
Angle of inclination be not construed as limiting.The setting form of this kind of anode 4 is simple, reduces the cost of device.
Furthermore, it is understood that the shape of anode 4 includes straight panel shape, curved surface plate shape or not advised by what straight panel and curved slab formed
Then shape.The shape of its Anodic 4 can also form the vee gutter with broken line by suppressing board-like material, or other grooves
Shape.The opening of the anode 4 of the flute profile is cut obliquely.
Specifically, anode 4 offers through hole in the horizontal direction, with the flowing of dusty gas, to adhere on anode 4
Dust disturbed by the air-flow that through hole passes through, and depart from anode 4.
When dust arrester works, dusty gas enters body 2 through gas feed 1, and high voltage power supply device 3 is carried out to negative electrode 5
Power supply, gas ionization, dust charged, the upward electric field formed between the discharge tip of negative electrode 5 and the anode 4 of corresponding its underpart
Under effect, Charged is by downward power and moves downward.Because of the corona of negative electrode 5, dust charge negative electricity, its direction of motion and electricity upwards
Field direction is opposite.Meanwhile Charged carries out horizontal movement with the flow direction of dusty gas, its resultant motion direction is oblique
It is lower to be separated before Charged reaches gas vent 6 from gas towards the direction of ash bucket 7, fall into ash bucket 7 and enter in ash bucket 7 by
Trapping.
Because the short transverse of dust arrester has multiple upward electric fields, dusty gas is from gas feed 1 to gas vent 6
During, Charged can repeatedly be accelerated when being moved obliquely towards ash bucket direction；Non- Charged is in flow process
In, have repeatedly by charged chance, can be moved obliquely towards ash bucket direction after charged.
Embodiment 4, the dust arrester also include：Ash bucket 7, be arranged in the side wall of body 2, and with the body 2
Inside connection, the concave face of the anode 4 point to the ash bucket 7；The first end of ash bucket 7 connects with body 2；The second of ash bucket 7
Hold as tip；The tip of the ash bucket 7 is arranged at ash-removing valve 23.Ash bucket 7 is in a funnel-form, is arranged at the bottom surface of body 2, can
To collect by the dust in dusty gas in body 2.Ash-removing valve 23 can discharge the dust in ash bucket 7 outside ash bucket 7, so as to
It is easy to clean ash bucket 7 in real time, avoiding dust accretions influences cleaning effect.
Embodiment 5, shown in reference picture 6, a plurality of spoiler 10 is provided with ash bucket 7, is provided with each spoiler 10 logical
Hole.Spoiler 10 is arranged in a row along vertical direction, and effect is the electric discharge contact area for increasing Charged in ash bucket 7.This
(small part Charged is golden through wire netting 11 for the ion quickly moved down, Charged and non-Charged in body 2
Category net 11 attracts) enter ash bucket 7, Charged is discharged by the side wall and spoiler 10 of ash bucket 7.
Dust in lattice gear ash bucket 7 simultaneously, prevents dust from taking away ash bucket 7 by air-flow.Set simultaneously on spoiler 10
Through hole, prevent that the air pressure between each spoiler 10 is excessive, drive dust to leave ash bucket 7.
Embodiment 6, shown in reference picture 6, the first end close to the ash bucket 7 of the gas vent 6 is provided with wire netting
11 or grid, the spoiler 10 close to gas vent 6 is crossed in the flow direction of wire netting 11 or grid against dusty gas.Namely
Say, wire netting 11 stretches out the spoiler 10 near gas vent 6, extends to gas vent 6.Close to the choked flow of gas vent 6
After through hole produces air flue on plate 10, the dust at this on spoiler 10 can be moved by air-flow band trend gas vent 6, and there is provided gold
, can be with the gas of flowing at Rose Box gas vent 6 after belonging to net 11 or grid.The dust on the top of wire netting 11 can by shaking or
Other modes are not shown, and ash is discharged into the ash bucket 7 of the bottom of wire netting 11.
Embodiment 7, shown in reference picture 7, dust arrester also includes means of deflation, including：Communicating pipe 12, valve 13 and filtering
Net 16.Dust in the ash bucket 7 of gas vent 6, it can be moved in the presence of air-flow to gas vent 6.Deflate and fill
Put the pressure that can be reduced in ash bucket 7.
Connect the side wall and gas vent 6 of the ash bucket 7 close to gas vent 6 communicating pipe 12；Valve 13 is arranged at the company
On siphunculus 12；Screen pack 16 is arranged at the communicating pipe 12 in the opening of one end of the ash bucket 7.
Ion, Charged and the non-Charged quickly moved down enters ash bucket 7, Charged by grey headwall and
Spoiler 10 discharges, and when the space pressure of ash bucket 7 and ash bucket upper metal net 11 increases, valve opening door 13, gas passes through screen pack
16 and discharge communicating pipe 12, floating dust is stopped and filtered by screen pack 16.
Embodiment 8, shown in reference picture 7, dust arrester includes the first deashing device, is connected and is used cooperatively with ash bucket 7.First
Deashing device includes：First transmission device 18, positioned at the outside of ash bucket 7；Shaft coupling 19；First power transmission shaft 20, a part of position
Inside the ash bucket 7, another part stretches out the outside of the ash bucket 7；Multiple brushes 22 of stirring body 21 and first, are fixed on institute
State on the first power transmission shaft 20；First brush 22 is set against spoiler 10.
Embodiment 9, dust arrester also includes：Second deashing device, is used cooperatively with means of deflation, including：Second transmission
Device 14, positioned at the ash bucket 7 and the outside of the communicating pipe 12；Second driving shaft 15, a part are located at the communicating pipe 12
Inside and pass through the filter screen 16, another part stretches out communicating pipe 12；Second brush 17, the fixed second driving shaft
15 end simultaneously abuts the screen pack 16.
In addition, the dust on negative electrode 5 and anode 4 can shake mode by tradition carries out deashing.
When putting ash, open ash-removing valve 23 and start the first deashing device, its first power transmission shaft 20 drives the first brush 22 to revolve
Turn and remove the dust on spoiler 10.
When the increase of the space pressure of ash bucket 7 and the upper metal net 11 of ash bucket 7, the upper valve of means of deflation outlet pipe 12 is opened
, gas can be discharged to gas vent 6 by communicating pipe 12 in ash bucket 7；The dust filtered by the screen pack 16 of communicating pipe 12, can
It is purged by the second brush 17 rotation of the second transmission device 14 of the second deashing device.
Embodiment 10, dust arrester of the present utility model are applicable a kind of dust removal method, including：
Dusty gas is passed through in body 2 by gas feed 1；
Negative electrode 5 and anode 4 of the dusty gas by setting in the body 2；
Each anode 4 be a plate shape being obliquely installed, the anode 4 to the inclination of dusty gas flow direction or to
The opposite direction of dusty gas flow direction tilts；
The lower section of each anode 4 sets the discharge tip of the negative electrode 5, and each discharge tip is located at each sun
Within the scope of the orthographic projection of pole 4
Dusty gas flows in the body 2, and dust enters institute in the presence of the electric field that negative electrode 5 and anode 4 are formed
State in ash bucket 7, the gas after dedusting discharges through gas vent 6.
Above-described is preferred embodiment of the present utility model, it should be pointed out that for the ordinary person of the art
For, some improvements and modifications can also be made under the premise of principle described in the utility model is not departed from, these are improved and profit
Decorations are also in the scope of protection of the utility model.Each embodiment in this specification is described by the way of progressive, each
What embodiment stressed is all the difference with other embodiment, the identical mutual coherent in similar part between each embodiment
See.
In description of the present utility model, it is to be understood that term " longitudinal direction ", " radial direction ", " length ", " width ", " thickness
The side of the instruction such as degree ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer "
Position or position relationship are based on orientation shown in the drawings or position relationship, are for only for ease of description the utility model and simplification is retouched
State, rather than instruction or imply signified device or element there must be specific orientation, with specific azimuth configuration and operation,
Therefore it is not intended that to limitation of the present utility model.In description of the present utility model, unless otherwise indicated, " multiples' " contains
Justice is two or more.
Above-described is preferred embodiment of the present utility model, it should be pointed out that for the ordinary person of the art
For, some improvements and modifications can also be made under the premise of principle described in the utility model is not departed from, these are improved and profit
Decorations are also in the scope of protection of the utility model.
Claims (10)
1. a kind of dust arrester, including：
Body (2), gas feed (1), gas vent (6) and ash bucket (7) are provided with the body (2)；Dusty gas leads to
Cross the gas feed (1) and enter flowing in the body (2), and pass through the gas vent (6) and discharge；
Anode (4) and negative electrode (5), be arranged in the body (2), positioned at the gas feed (1) and gas vent (6) it
Between, high voltage power supply device (3) controls and forms electric field between the anode (4) and the negative electrode (5)；
Characterized in that,
Each anode (4) be a plate shape being obliquely installed, the anode (4) to the inclination of dusty gas flow direction or to
The opposite direction of dusty gas flow direction tilts；
The lower section of each anode (4) sets the discharge tip of the negative electrode (5), and each discharge tip is located at each sun
Within the scope of the orthographic projection of pole (4).
2. dust arrester according to claim 1, it is characterised in that the discharge tip of the anode (4) and the negative electrode (5)
Hold arranged for interval in the height direction；The anode (4) in each height is arranged in rows along the flow direction of dusty gas, often
The discharge tip of the negative electrode (5) in individual height is arranged in rows along the flow direction of dusty gas.
3. dust arrester according to claim 2, it is characterised in that the length direction of the anode (4) and the dust-laden
The flow direction of gas is vertical.
4. according to the dust arrester described in claim 1,2 or 3, it is characterised in that
The anode (4) offers through hole along the flow direction of dusty gas.
5. dust arrester according to claim 1, it is characterised in that be provided with a plurality of spoiler in the ash bucket (7)
(10), it is provided with through hole on each spoiler (10).
6. dust arrester according to claim 5, it is characterised in that close to the ash bucket (7) of the gas vent (6)
First end be provided with wire netting or grid, the flow direction of wire netting or grid against the dusty gas is crossed close to the gas
The spoiler (10) of body outlet (6).
7. dust arrester according to claim 1, it is characterised in that also including means of deflation, including：
Communicating pipe (12), connect the side wall and the gas vent (6) of the ash bucket (7) close to the gas vent (6)；
Valve (13), it is arranged on the communicating pipe (12)；
Screen pack (16), the communicating pipe (12) is arranged in the opening of one end of the ash bucket (7).
8. dust arrester according to claim 1, it is characterised in that also include：First deashing device, including：
First transmission device (18), on the outside of the ash bucket (7)；
Shaft coupling (19)；
First power transmission shaft (20), a part is internal positioned at the ash bucket (7), and another part stretches out the outside of the ash bucket (7)；
Multiple stirring bodies (21) and the first brush (22), it is fixed on first power transmission shaft (20)；First brush (22)
Set against spoiler (10).
9. dust arrester according to claim 7, it is characterised in that also include：Second deashing device, including：
Second transmission device (14), positioned at the ash bucket (7) and the outside of the communicating pipe (12)；
Second driving shaft (15), a part is positioned at the inside of the communicating pipe (12) and passes through the filter screen (16), another part
Stretch out the communicating pipe (12)；
Second brush (17), the end of the fixed second driving shaft (15) simultaneously abut the screen pack (16).
10. dust arrester according to claim 1, it is characterised in that the shape of the anode (4) includes straight panel shape, song
Panel-shaped or the irregular shape being made up of straight panel and curved slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720423986.2U CN206652609U (en) | 2017-04-21 | 2017-04-21 | A kind of dust arrester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720423986.2U CN206652609U (en) | 2017-04-21 | 2017-04-21 | A kind of dust arrester |
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| CN206652609U true CN206652609U (en) | 2017-11-21 |
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ID=60319449
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108211527A (en) * | 2018-01-29 | 2018-06-29 | 付崇沛 | The pre- grading plant and method of high concentrate dust |
-
2017
- 2017-04-21 CN CN201720423986.2U patent/CN206652609U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108211527A (en) * | 2018-01-29 | 2018-06-29 | 付崇沛 | The pre- grading plant and method of high concentrate dust |
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