CN104985533B - Circulation timber polishing sanding dust collecting system in low energy consumption non-contaminated air - Google Patents
Circulation timber polishing sanding dust collecting system in low energy consumption non-contaminated air Download PDFInfo
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- CN104985533B CN104985533B CN201510468848.1A CN201510468848A CN104985533B CN 104985533 B CN104985533 B CN 104985533B CN 201510468848 A CN201510468848 A CN 201510468848A CN 104985533 B CN104985533 B CN 104985533B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses timber polishing sanding dust collecting system is recycled in low energy consumption non-contaminated air, mainly it is made of carrier system, air circulation system, filtration system and dust settling collection system；Carrier system includes pedestal and objective table；The air outlet of air circulation system is installed on the surface of objective table, and the front of objective table is arranged in air inlet, is 15-30 centimetres with a distance from objective table edge；Air circulation inner passage is the air self-loopa inner passage for connecting air inlet and air outlet；Blower is set in air self-loopa inner passage；Filtration system includes the first blind window, middle effect pillar filter, middle effect leaf filter and the second blind window；Dust settling collection system includes dust collecting box and smooth metal plate.The present invention greatly reduces power of fan by air circulation system, can be adsorbed and be wooded the dust generated in bruting process by filtration system and dust settling collection system, extraordinary to achieve energy-saving and emission reduction purposes.
Description
Technical field
The present invention relates to the pre-treatment fields of woodwork coating coating, and in particular to a kind of low energy consumption internal air circulation timber is beaten
Frosted light dust collecting system.
Background technique
The major significance of woodwork coating pre-treatment is to provide a smooth light for final wood product surface coating process
Sliding, color uniformly, wood grain clearly surface.
After various machining processes, surface is uneven timber, and need to carry out surface to polish sanding processing
To reach the surface requirements of construction paint.Current most of woodwork coating production lines process work using open polishing sanding etc.
Sequence, the dust direct emission that will be generated in timber process using high-power exhaust fan are polluted outdoor environment, are not met country
It is proposed " clean manufacturing, energy-saving and emission-reduction " policy guidance, while timber generate a large amount of fugitive dust during polishing sanding can
Dust explosion or fire, life-threatening safety can be generated.
Summary of the invention
The present invention status big for existing woodwork coating Coating Pretreatment highly energy-consuming, dust pollution, proposes a kind of knot
The timber polishing sand that filtration system, air circulation system and dust settling collection system are closed to reduce dust pollution, reduce energy consumption
Light dust collecting system.
To achieve the above object, technical scheme is as follows:
Circulation timber polishing sanding dust collecting system in low energy consumption non-contaminated air, mainly by carrier system, air circulation system
System, filtration system and dust settling collection system composition；
The carrier system includes pedestal and objective table；Objective table is set on the base；The height 40- of objective table from the ground
60 centimetres；
The air circulation system includes air inlet, blower, air circulation duct and air outlet；Air outlet is installed on loading
The surface of platform, the front of objective table is arranged in 240-300 centimetres of height, air inlet from the ground, from objective table edge away from
From being 15-30 centimetres；Air circulation inner passage is the air self-loopa inner passage for connecting air inlet and air outlet；Blower is set
It is placed in air self-loopa inner passage；
The filtration system includes the first blind window, middle effect pillar filter, middle effect leaf filter and the second blind window；
First blind window is arranged at air inlet, and middle effect pillar filter is arranged in air circulation duct, is located at air inlet rear；In
It imitates leaf filter and the second blind window is arranged at air outlet, middle effect leaf filter is located above the second blind window；Blower
Air inlet connect with middle effect pillar filter, fan outlet is connect with middle effect leaf filter；
The dust settling collection system includes dust collecting box and smooth metal plate；Dust collecting box is arranged in objective table
Lower section；Smooth metal plate is inclined in air circulation duct, positioned at it is middle effect pillar filter lower end, smooth metal plate
Lower end is connect with dust collecting box.
To further realize the object of the invention, it is preferable that be equipped with ball between the pedestal and objective table.
Preferably, the air circulation duct is connected to composition with two sections of horizontal pipe using vertical pipe；Vertical pipe portion
Divide from 2.50 to 3.0 meters of height；1.5-2.0 meters of horizontal pipe partial-length.
Preferably, the assembling is in the horizontal pipe of air circulation duct and the intersection of vertical pipe, away from ground
Height is at 2.4 to 2.8 meters.
Preferably, the blower is a 2-3 kilowatts of centrifugal blower.
Preferably, the air inlet is 4 rectangular air inlets of block form of 60 centimetres of 60 cm x；Air inlet width is greater than
0.1-0.5 meters of loading polishing table width, highly for from lower than 0.01-0.1 meters of loading polishing table startings to 1.2-1.6 meters of.
Preferably, 4 of the air outlet onesize rectangular gas outlets are distributed in same plane or are distributed in same
Cambered surface；
Two in either 4 onesize rectangular air outlets are respectively distributed on two trapezoidal waists of evagination, in addition
Two are distributed in side by side on the trapezoidal upper bottom of evagination；
Two in either 4 onesize rectangular air outlets are respectively distributed on two waists of inner concave shape ladder, in addition
Two are distributed in side by side on the interior concave bottom of inner concave shape ladder.
Preferably, first blind window and the second blind window are by 60 lis of 15 leaf length being embedded in outer metal framework
Rice, the hinge composition of 4 centimetres of width of rotary movable aluminum alloy material；Middle effect pillar filter and middle effect leaf filter are used
Superfine synthesized fiber is dust-filtering material, wherein between 1 to 1.2 meters, diameter 0.25 arrives middle effect pillar filter length
Cylindrical-shaped structure between 0.35 meter, outer layer plain cotton fabric super-fine fiber material filter cloth；Middle effect leaf filter is planar illiteracy
Cloth superfine fibre filter cloth structure.
Preferably, the dust collecting box is multiple, and dust collecting box is the dust collecting box of drawing device；Dust collection
The porous flat plate of covering aperture 1cm above box.Further, the dust settling collection system is by being located at four below objective table
The porous metals plate of a dust collecting box with drawing device arranged side by side, the aperture 1cm being covered on above dust collecting box, with
And the metal plate composition directly communicated with dust collecting box at 30 degree of air circulation duct bottom inclination angle.
Preferably, the inclined angle of smooth metal plate is 30-45 degree.The filtration system is in centrifugal blower exhausting
The middle effect leaf filter installed at the middle effect pillar filter and air outlet installed at mouthful.
Filtration system of the present invention is made of demountable filter.
Compared with prior art, the present invention has the advantage that the present invention is utilized simultaneously using internal air circulation system
The import negative pressure and outlet positive pressure of centrifugal blower, can be down to 2-3kW from 10kW or so for power of fan, greatly reduce energy consumption.
Simultaneously by dust settling collection system, air filter combination air circulation system, make to produce during timber polishing sanding
Raw dust can realize sedimentation completely and absorption substantially, not generate dust pollution, and whole system is extraordinary to be reached energy conservation and subtract
Row, the purpose for reducing pollution.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of circulation timber polishing sanding dust collecting system in low energy consumption non-contaminated air；
Fig. 2 is the air outlet structure schematic diagram in Fig. 1 of embodiment 1；
Fig. 3 is the structural schematic diagram of the air outlet of embodiment 2；
Fig. 4 is the structural schematic diagram of the air outlet of embodiment 3；
Fig. 5 is the structural schematic diagram of the air outlet of embodiment 4；
It is shown in figure: pedestal 1, objective table 2, air inlet 4, the first blind window 5, middle effect pillar filter 6, blower 7, air
Recycle inner passage 8, air outlet 9, middle effect leaf filter 10, the second blind window 11, smooth metal plate 12.
Specific embodiment
For a better understanding of the invention, the present invention will be further described below with reference to the drawings, but embodiment is not
Constitute limiting the scope of the invention.
Embodiment 1
As shown in Figure 1, low energy consumption non-contaminated air in circulation timber polish sanding dust collecting system, mainly by carrier system,
Air circulation system, filtration system and dust settling collection system composition；
Wherein, carrier system includes pedestal 1 and objective table 2；Objective table 2 is arranged on pedestal 1, preferably pedestal 1 and loading
Ball is equipped between platform 2, objective table 2 can 360 ° of rotations on pedestal 1；The height of objective table 2 from the ground is 0.4-0.6 meters.
Air circulation system includes air inlet 4, blower 7, air circulation inner passage 8 and air outlet 9；Air outlet 9 is installed
In the surface of objective table 2,240-300 centimetres of height from the ground, the front of objective table 2 is arranged in air inlet 4, from objective table
The distance at 2 edges is 15-30 centimetres；Air circulation inner passage 8 is in the air self-loopa for connect air inlet 4 and air outlet 9
Portion channel；Composition is preferably connected to two sections of horizontal pipe using vertical pipe；Further preferred vertical pipe part is from highly
2.50 to 3.0 meters；1.5-2.0 meters of horizontal pipe partial-length；Blower is set in air self-circulation channel；It is preferred that blower 7 is pacified
The intersection of horizontal pipe and vertical pipe loaded on air circulation inner passage 8, away from ground level at 2.4 to 2.8 meters；Air draught
Mouth 4 is 4 rectangular air inlets of block form of 60 centimetres of 60 cm x, and air inlet overall width is slightly larger than loading polishing table width,
Height is to originate from slightly below loading polishing table to 1.2-1.6 meters of；Specifically, air inlet width is wide greater than loading polishing table
0.1-0.5 meters of degree, highly for from lower than 0.01-0.1 meters of loading polishing table startings to 1.2-1.6 meters of.Air outlet 9 is preferably 60
The rectangular gas outlet of 60 centimetres of cm x of 4 block forms arrangement；The preferred centrifugal blower of blower 7.
Air circulation duct includes the external channel of air circulation inner passage 8 and air outlet 9 to air inlet 4, composition half
Closed type air circulation passage.
Filtration system includes the first blind window 5, middle effect pillar filter 6, middle effect plate as negative pressure volume adjusting apparatus
Formula filter 10 and the second blind window 11 as positive pressure volume adjusting apparatus；First blind window 5 is arranged at air inlet 4, in
It imitates pillar filter 6 to be arranged in air circulation inner passage 8, is located at 4 rear of air inlet；The air inlet of blower 7 and middle effect column
Formula filter 6 connects, and fan outlet is connect with middle effect leaf filter 10.Effect pillar filter 6 is arranged in air in it is preferred that
In the vertical pipe for recycling inner passage 8, middle effect leaf filter 10 and the second blind window 11 are arranged at air outlet 9, middle effect
Leaf filter 10 is located at 11 top of the second blind window；It is preferred that the first blind window 5 and the second blind window 11 are by being embedded in outer metal
60 centimetres of 15 leaf length in frame, the hinge composition of 4 centimetres of width of rotary movable aluminum alloy material；Middle effect pillar filtering
Device 6 and middle effect leaf filter 10 are preferably dust-filtering material with superfine synthesized fiber, be may be implemented to partial size >=1.0 μm
Effective filtering of dust in air, wherein middle 6 length of effect pillar filter is between 1 to 1.2 meters, and 0.25 to 0.35 meter of diameter
Between cylindrical-shaped structure, outer layer plain cotton fabric super-fine fiber material filter cloth；Middle effect leaf filter 10 is super for planar plain cotton fabric
Fine fiber filter cloth structure.Filtration system is equipped with two-stage filter, and first level filtering device is to be connected with centrifugal blower suction opening
Five side by side in imitate pillar filters, two-stage filter is four at air outlet middle effect plate-type filterings arranged side by side
Device；Filtration system is made of demountable filter.
Dust settling collection system includes dust collecting box 3 and smooth metal plate 12；Dust collecting box 3 is arranged in objective table
2 lower sections；Smooth metal plate 12 is inclined in air circulation inner passage 8, and the angle of preferred angled is 30-45 degree；It is located at
The lower end of middle effect pillar filter 6, the lower end of smooth metal plate 12 is connect with dust collecting box 3；It is preferred that dust collecting box 3 is more
A, further preferred dust collecting box 3 is four；Dust collecting box is preferably the dust collecting box of drawing device；Aperture is 1 li
The porous flat plate of rice is covered on above dust collecting box.
(monolithic window can be adjusted by the opening and closing and degree of blind window at control air inlet in the suction air volume of each air inlet
Leaf can planar 180 ° of torsions), the air output of each air outlet can pass through the opening and closing and degree of blind window at control air outlet
It is adjusted (monolithic window leaf can planar 180 ° torsion).Drive air in semi-enclosed air circulation when centrifugal blower operates
It is flowed in inner passage 8, forms negative pressuren zone in 2 front spatial dimension of objective table, in 2 surface spatial dimension of objective table
Form zone of positive pressure；Polishing workpiece be placed on objective table 2, polishing sanding during generate a large amount of dust, wherein large dust particle by
Zone of positive pressure effect quickly directly sedimentation, and the lesser dust easily drifted of particle under negative pressuren zone suction by air inlet 4
The blinds apparatus 5 at place enters air circulation inner passage 8, imitates in and collects and settle after pillar filter 6 is separated, flows
Dynamic air is discharged after middle effect leaf filter 10 carries out double purification at air outlet 9, realizes circulating for air.
Smooth metal plate 12 is arranged in air circulation duct, communicates with dust collecting box 3, and pillar filter 6 is imitated in
The dust assembled after filtering falls into dust collecting box 3 by smooth metal plate 12, is not inhaled into the powder of air circulation inner passage 8
Dirt directly settles under the alee power effect of gravity combination air outlet and is collected in dust collecting box 3.
The present invention is utilized the import negative pressure of centrifugal blower generation simultaneously by semienclosed air circulation system and gone out
Mouth positive pressure, can be down to 2-3kW from 10kW or so for power of fan, greatly reduce energy consumption；Promoted simultaneously using 9 positive pressure of air outlet
It is acted on into dust settling and air outlet negative pressure suction dust, it is possible to prevente effectively from the dust four generated during timber polishing sanding
Place is drifted, and realizes non-pollution technology.
It is illustrated in figure 2 the air outlet structure figure of circulation timber polishing sanding dust collecting system in low energy consumption non-contaminated air,
Including being distributed in conplane 4 onesize rectangular air outlets, air outlet air quantity can pass through control air inlet 4 and air outlet
The opening and closing of the movable sheet of 9 the first blind window 5 and the second blind window 11 is closed degree and is controlled.The present invention passes through preferred outlet air
Mouthful design, the opening and closing of adjustment rotation speed of fan, air outlet and air inlet blind window movable sheet close degree realize air force and its
Distribution, the adjusting of air positive pressure and negative pressure.By improving rotation speed of fan, reduces the opening degree of intermediate two air outlets, improve
The opening degree of two sides air outlet increases the circulation of polishing part two sides air, makes to reduce the air that front blows to polishing part
Polishing part front wind speed reduces, and positive pressure reduces, and side and back side wind speed increase, and negative pressure improves, and then realizes and guaranteeing dust energy
Enough rapid subsidences, a large amount of absorption are emitted into atmosphere without dispersing everywhere.
Embodiment 2
The embodiment difference from Example 1 is the structure of air outlet 9；Low energy consumption non-contaminated air as shown in Figure 3
The air outlet structure figure of interior circulation timber polishing sanding dust collecting system, 4 including the being distributed in same cambered surface big outlet air such as rectangular
Mouthful.
Embodiment 3
The embodiment difference from Example 1 is the structure of air outlet 9；Air outlet structure figure as shown in Figure 4 is point
It is distributed in 4 of the male type trapezoidal faces big air outlets such as rectangular；Two in 4 onesize rectangular air outlets are respectively distributed to outside
On convex two trapezoidal waists, other two is distributed in side by side on the trapezoidal upper bottom of evagination.
Embodiment 4
The embodiment difference from Example 1 is the structure of air outlet 9；Air outlet structure figure as shown in Figure 5 is point
It is distributed in 4 of the inner concave shape trapezoidal faces big air outlets such as rectangular；Two in 4 onesize rectangular air outlets be respectively distributed in
On two waists of concave ladder, other two is distributed in side by side on the interior concave bottom of inner concave shape ladder.
Single air outlet air quantity can pass through the first blind window 5 and second of control air inlet and air outlet in above-described embodiment
The opening and closing of the movable sheet of blind window 11 is closed degree and is controlled.It is required not according to construction site space size and installation site
Together, thus it is possible to vary the distributed architecture at air outlet is caused with adapting to different installation and requirement without being used for performance
It influences.
It should be noted that embodiment of the present invention are not limited by the above embodiments, other are any without departing from this
Made changes, modifications, substitutions, combinations, simplifications under the spiritual essence and principle of invention, are regarded as equivalent substitute mode,
It is included within the scope of the present invention.
Claims (8)
1. circulation timber polishing sanding dust collecting system in low energy consumption non-contaminated air, which is characterized in that mainly by carrier system, sky
The gas circulatory system, filtration system and dust settling collection system composition；
The carrier system includes pedestal and objective table；Objective table is set on the base；40-60 lis of the height of objective table from the ground
Rice；
The air circulation system includes air inlet, blower, air circulation duct and air outlet；Air outlet is installed on objective table
Surface, the front of objective table is arranged in 240-300 centimetres of height, air inlet from the ground, is with a distance from objective table edge
15-30 centimetres；Air circulation inner passage is the air self-loopa inner passage for connecting air inlet and air outlet；Blower is set to
In air self-loopa inner passage；
The air inlet is 4 rectangular air inlets of block form of 60 centimetres of 60 cm x；Air inlet width is greater than loading polishing table
0.1-0.5 meters of width, highly for from lower than 0.01-0.1 meters of loading polishing table startings to 1.2-1.6 meters of；
The onesize rectangular gas outlet of 4 of the air outlet is distributed in same plane or is distributed in same cambered surface；Either 4
Two in a onesize rectangular air outlet are respectively distributed on two trapezoidal waists of evagination, other two is distributed in outer side by side
On convex trapezoidal upper bottom；Two in either 4 onesize rectangular air outlets are respectively distributed to two waists of inner concave shape ladder
On, other two is distributed in side by side on the interior concave bottom of inner concave shape ladder；
The filtration system includes the first blind window, middle effect pillar filter, middle effect leaf filter and the second blind window；First
Blind window is arranged at air inlet, and middle effect pillar filter is arranged in air circulation duct, is located at air inlet rear；Middle effect plate
Formula filter and the second blind window are arranged at air outlet, and middle effect leaf filter is located above the second blind window；Blower into
Air port connects with middle effect pillar filter, and fan outlet is connect with middle effect leaf filter；
The dust settling collection system includes dust collecting box and smooth metal plate；Dust collecting box is arranged under objective table
Side；Smooth metal plate is inclined in air circulation duct, under the lower end of middle effect pillar filter, smooth metal plate
End is connect with dust collecting box.
2. circulation timber polishing sanding dust collecting system, feature exist in low energy consumption non-contaminated air according to claim 1
In equipped with ball between the pedestal and objective table.
3. circulation timber polishing sanding dust collecting system, feature exist in low energy consumption non-contaminated air according to claim 1
In the air circulation duct is connected to composition with two sections of horizontal pipe using vertical pipe；Vertical pipe part from height 2.50
To 3.0 meters；1.5-2.0 meters of horizontal pipe partial-length.
4. circulation timber polishing sanding dust collecting system, feature exist in low energy consumption non-contaminated air according to claim 1
In the assembling is arrived in the horizontal pipe of air circulation duct and the intersection of vertical pipe, away from ground level 2.4
2.8 rice.
5. circulation timber polishing sanding dust collecting system, feature in low energy consumption non-contaminated air according to claim 1 or 4
It is, the blower is a 2-3 kilowatts of centrifugal blower.
6. circulation timber polishing sanding dust collecting system, feature exist in low energy consumption non-contaminated air according to claim 1
In, first blind window and the second blind window by 60 centimetres of 15 leaf length being embedded in outer metal framework, 4 centimetres of width
The hinge of rotary movable aluminum alloy material forms；Middle effect pillar filter and middle effect leaf filter are with superfine synthesized fiber
Dust-filtering material, wherein cylinder of the middle effect pillar filter length between 1 to 1.2 meters, between 0.25 to 0.35 meter of diameter
Shape structure, outer layer plain cotton fabric super-fine fiber material filter cloth；Middle effect leaf filter is planar plain cotton fabric superfine fibre filter cloth
Structure.
7. circulation timber polishing sanding dust collecting system, feature exist in low energy consumption non-contaminated air according to claim 1
Be in, the dust collecting box it is multiple, dust collecting box is the dust collecting box of drawing device；Hole is covered above dust collecting box
The porous flat plate of diameter 1cm.
8. circulation timber polishing sanding dust collecting system, feature exist in low energy consumption non-contaminated air according to claim 1
In the inclined angle of smooth metal plate is 30-45 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510468848.1A CN104985533B (en) | 2015-07-31 | 2015-07-31 | Circulation timber polishing sanding dust collecting system in low energy consumption non-contaminated air |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510468848.1A CN104985533B (en) | 2015-07-31 | 2015-07-31 | Circulation timber polishing sanding dust collecting system in low energy consumption non-contaminated air |
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| CN104985533A CN104985533A (en) | 2015-10-21 |
| CN104985533B true CN104985533B (en) | 2019-01-29 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105639851B (en) * | 2016-03-23 | 2020-04-03 | 温州齐鸣网络科技有限公司 | Cooling and dust removing device for polishing leather shoes |
| CN107186625A (en) * | 2017-05-19 | 2017-09-22 | 周琼 | A kind of auto parts sander with dust reduction capability |
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| JP2002159814A (en) * | 2000-11-24 | 2002-06-04 | Heiwa Corp | Dust collector |
| CN202621382U (en) * | 2012-05-18 | 2012-12-26 | 苏州源申涂装净化设备有限公司 | Dry-type paint-spraying room |
| CN203043775U (en) * | 2012-12-28 | 2013-07-10 | 东莞市四友机械设备有限公司 | Furniture product polishing workshop |
| CN103877823A (en) * | 2014-04-16 | 2014-06-25 | 任利萍 | Wet-type dust collection system |
| CN104015127A (en) * | 2014-06-19 | 2014-09-03 | 衢州市优德工业设计有限公司 | Dust-free stone sculpture grinding system |
| CN204935398U (en) * | 2015-07-31 | 2016-01-06 | 华南理工大学 | A kind of internal air circulation timber polishing sanding dust collecting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5140143B2 (en) * | 2010-11-24 | 2013-02-06 | 三笠産業株式会社 | Dust collector for concrete cutter |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002159814A (en) * | 2000-11-24 | 2002-06-04 | Heiwa Corp | Dust collector |
| CN202621382U (en) * | 2012-05-18 | 2012-12-26 | 苏州源申涂装净化设备有限公司 | Dry-type paint-spraying room |
| CN203043775U (en) * | 2012-12-28 | 2013-07-10 | 东莞市四友机械设备有限公司 | Furniture product polishing workshop |
| CN103877823A (en) * | 2014-04-16 | 2014-06-25 | 任利萍 | Wet-type dust collection system |
| CN104015127A (en) * | 2014-06-19 | 2014-09-03 | 衢州市优德工业设计有限公司 | Dust-free stone sculpture grinding system |
| CN204935398U (en) * | 2015-07-31 | 2016-01-06 | 华南理工大学 | A kind of internal air circulation timber polishing sanding dust collecting system |
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