CN115805679A - Powder remover and powder removing method - Google Patents
Powder remover and powder removing method Download PDFInfo
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- CN115805679A CN115805679A CN202111070420.3A CN202111070420A CN115805679A CN 115805679 A CN115805679 A CN 115805679A CN 202111070420 A CN202111070420 A CN 202111070420A CN 115805679 A CN115805679 A CN 115805679A
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Abstract
The invention discloses a powder remover and a powder removing method, and relates to the technical field of powder removers for plastic particles, wherein the powder remover comprises an external air supply channel, a particle conveying channel and a powder removing channel, wherein the powder removing channel is vertically arranged, the lower end of the powder removing channel is arranged in a closed manner, and the upper end of the powder removing channel is provided with an air outlet; the particle conveying channel and the outer air supply channel are spirally wound on the outer side of the powder removing channel in the same direction, each circle of the particle conveying channel is communicated with the powder removing channel through a plurality of first ventilation channels, and each circle of the outer air supply channel is communicated with the corresponding circle of the particle conveying channel through a plurality of second ventilation channels; the upper end of the particle conveying channel is provided with a feeding hole, the lower end of the particle conveying channel is provided with a discharging hole, the lower end of the outer air supply channel is provided with an air inlet, and the upper end of the outer air supply channel is sealed. The powder removing rate of the powder remover is 95-99%, and the powder removing rate is high.
Description
Technical Field
The invention belongs to the technical field of powder removers for plastic particles, and particularly relates to a powder remover.
Background
The plastic particles refer to granular plastics, including general plastics (such as polypropylene, polyethylene, polyvinyl chloride and the like), engineering plastics (such as nylon, polytetrafluoroethylene, polycarbon organic silicon and the like) and special plastics (such as thermosetting plastics, functional polymer plastics and the like), the production process of the plastic particles generally needs to be subjected to the working procedures of granulation, screening, pneumatic conveying, blending, storage, packaging and the like, and granular plastic products are finally formed.
Disclosure of Invention
In order to solve the technical problems, the invention provides the powder remover and the powder removing method, which can effectively remove dust in plastic particles, improve the product quality and grade of the plastic particles and eliminate the potential safety hazard of dust explosion.
The technical scheme of the invention is as follows:
in one aspect, the present invention provides a powder remover comprising an external air blowing channel, a particle transporting channel and a powder removing channel, wherein,
the powder removing channel is vertically arranged, the lower end of the powder removing channel is arranged in a closed mode, and an air outlet is formed in the upper end of the powder removing channel;
the particle conveying channel and the outer air supply channel are spirally wound on the outer side of the powder removing channel in the same direction, each circle of the particle conveying channel is communicated with the powder removing channel through a plurality of first ventilation channels, and each circle of the outer air supply channel is communicated with the corresponding circle of the particle conveying channel through a plurality of second ventilation channels;
the upper end of the particle conveying channel is provided with a feeding hole, the lower end of the particle conveying channel is provided with a discharging hole, the lower end of the outer air supply channel is provided with an air inlet, and the upper end of the outer air supply channel is sealed.
Further, the cross-sectional dimensions of the first ventilation channel and the second ventilation channel are smaller than the largest dimension of the particles conveyed by the particle conveying channel.
Further, the distance between the central line of the outer air supply channel and the powder removing channel in each circle is larger than the distance between the central line of the particle conveying channel in the corresponding circle and the powder removing channel.
Further, the height of the central line of each circle of the outer air supply channel is lower than that of the central line of the particle conveying channel of the corresponding circle.
Furthermore, the included angle between each circle of the particle conveying channel and the center line of the powder removing channel is 15-45 degrees.
Furthermore, the included angle between the particle conveying channel and the center line of the powder removing channel in each circle is 30-40 DEG
Further, the duster still includes interior air supply passageway, interior air supply passageway with particle transfer passage syntropy spiral winding is in the outside of gumming passageway, every circle interior air supply passageway set up in corresponding the circle particle transfer passage with between the gumming passageway, every circle interior air supply passageway with gumming passageway intercommunication, every circle interior air supply passageway with correspond the circle particle transfer passage passes through first ventilation passageway intercommunication, the upper end and the lower extreme of interior air supply passageway all seal the setting.
In another aspect, the present invention provides a method for removing powder by using the above-mentioned powder remover, the method comprising,
adding plastic particles into a feed inlet of the particle conveying channel, and simultaneously blowing air into an air inlet of the outer air blowing channel;
air in the external air supply channel enters the particle conveying channel from the second ventilation channel and acts with particles in the particle ventilation channel to carry away dust;
and the air with the dust enters the powder removing channel through the first ventilation channel and is discharged from the air outlet of the powder removing channel.
Furthermore, the maximum size of the plastic particles is less than 15mm, and the particle size of the dust is less than or equal to 500 mu m.
Furthermore, the unit cross-sectional flux of the plastic particles is less than 500t/h, and the unit cross-sectional flux of the external air supply channel is less than or equal to 200000Nm 3 And h, the air supply pressure of the external air supply channel is less than or equal to 60KPa.
The beneficial effects of the invention at least comprise:
the invention provides a powder remover which comprises an external air supply channel, a particle conveying channel and a powder removing channel, wherein plastic particles enter through a feed inlet at the upper end of the particle conveying channel, the plastic particles move from the upper end to the lower end along the spirally surrounding particle conveying channel under the action of gravity, air is supplied into an air inlet at the lower end of the external air supply channel, the air moves from the lower end to the upper end along the external air supply channel, each circle of external air supply channel is communicated with the corresponding circle of particle conveying channel through a plurality of second air ventilation channels, therefore, the air in the external air supply channel moves to the particle conveying channel along the second air ventilation channels under the action of pressure, the moving air meets the particles, the moving air has small mass and can overcome the mass of dust and the adhesive force between the dust and the plastic particles, the dust moves along with the moving air, each circle of particle conveying channels are communicated with the powder removing channels through a plurality of first air ventilation channels, the air mixed with the dust can move into the powder removing channel along the first ventilation channels, the lower end of the powder removing channel is closed, the air outlet of the dust mixing channel can only run from the upper end of the dust removing channel, and the dust removing channel has a good dust removing effect from top to bottom.
Drawings
FIG. 1 is a schematic three-dimensional structure of a powder remover according to the present embodiment;
FIG. 2 is a schematic view of a portion of the structure of FIG. 1;
FIG. 3 is a schematic diagram of the particle transport passageway of FIG. 1;
fig. 4 is a cross-sectional view of the central axis of the dusting channel of fig. 1.
Description of reference numerals:
1-a powder removing channel and 101-an air outlet;
2-an inner air supply channel;
3-particle conveying channel, 301-feeding hole, 302-discharging hole, 303-first ventilating surface, 304-second ventilating surface;
4-an external air supply channel, 401-an air inlet;
5-a first ventilation channel;
6-second air supply channel.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
Fig. 1 is a schematic three-dimensional structure diagram of a powder remover according to the present embodiment, fig. 2 is a schematic partial structure diagram of fig. 1, fig. 3 is a schematic structural diagram of a particle conveying channel of fig. 1, fig. 4 is a cross-sectional view of the powder removing channel of fig. 1 through a central axis, and in combination with fig. 1 to 4, the present invention provides a powder remover, which includes an external air supply channel 4, a particle conveying channel 3 and a powder removing channel 1.
The powder removing channel 1 is vertically arranged, the lower end of the powder removing channel 1 is arranged in a closed mode, and the upper end of the powder removing channel is provided with an air outlet 101; the particle conveying channel 3 and the outer air supply channel 4 are spirally wound on the outer side of the powder removing channel 1 in the same direction, each circle of particle conveying channel 3 is communicated with the powder removing channel 1 through a plurality of first ventilation channels 5, and each circle of outer air supply channel 4 is communicated with the corresponding circle of particle conveying channel 3 through a plurality of second ventilation channels 6; the upper end of the particle conveying channel 3 is provided with a feeding hole 301, the lower end is provided with a discharging hole 302, the lower end of the outer air supply channel 4 is provided with an air inlet 401, and the upper end is closed.
The plastic particles enter through a feed inlet 301 at the upper end of the particle conveying channel 3, the plastic particles move from the upper end to the lower end along the outer side of the spirally surrounding particle conveying channel 3 under the action of gravity and centrifugal force, meanwhile, air is blown in an air inlet 401 at the lower end of the outer air blowing channel 4, the air moves from the lower end to the upper end along the outer air blowing channel 4, because each circle of outer air blowing channel 4 and the corresponding circle of particle conveying channel 3 are communicated through a plurality of second air blowing channels 6, therefore, the air in the outer air blowing channel 4 can move to the particle conveying channel 3 along the second air blowing channels 6 under the action of pressure, the moving air meets the particles, because the moving air has speed, the mass of dust is small, the moving air can overcome the mass of dust and the adhesive force between the dust and the plastic particles, the dust can move along with the moving air, each circle of particle conveying channel 3 is communicated with the powder removing channel 1 through a plurality of first air blowing channels 5, therefore, the air mixed with the dust can move to the powder removing channel 1 along the upper end of the first air blowing channel 5, the dust removing channel 1 is closed, the dust removing channel 1 can only run from the upper end, and the dust removing channel 101, the dust removing channel has a good dust removing effect from the upper end, and the dust removing path is good from the bottom.
If the lower end of the powder removing channel 1 is provided with an air supply outlet and the upper end is sealed, the outer air supply channel 4 is used as a dust collecting channel, and the particles can be removed along the outer side of the particle conveying channel 3 due to the centrifugal action of the particles in the spiral motion.
The particle conveying channel 3 is arranged in a spiral shape, so that the residence time of the plastic particles in the particle conveying channel 3 can be increased, the action time of air and the plastic particles is prolonged, and dust attached to the plastic particles is removed.
In practice, the cross section of the particle transport channel 3 may be rectangular or circular, and is not limited herein. The first ventilation channel 5 is preferably arranged on both sides of the particle transport channel 3 and the dusting channel 1, which are adjacent to each other, whereas the second ventilation channel 6 is preferably arranged on both measuring surfaces of the particle transport channel 3 and the external blowing channel 4, which are adjacent to each other.
Preferably, in this embodiment, the cross-sectional dimensions of the first ventilation channel 5 and the second ventilation channel 6 are smaller than the maximum dimension of the particles conveyed by the particle conveying channel 3, so that plastic particles can be effectively prevented from entering the powder removing channel 1 and the outer air conveying channel 4 from the particle conveying channel 3.
Preferably, with reference to fig. 2 and fig. 4, in this embodiment, the distance between the center line of each circle of the outer air supply channel 4 and the powder removing channel 1 is greater than the distance between the center line of the corresponding circle of the particle conveying channel 3 and the powder removing channel 1, so that the inner side of each circle of the outer air supply channel 4 can be attached to the outer side of the corresponding circle of the particle conveying channel 3, in a specific implementation, a portion, attached to the outer side of the corresponding circle of the particle conveying channel 3, of the inner side of each circle of the outer air supply channel 4 may share one second air supply surface 304, a plurality of second air supply holes are formed in the second air supply surface 304 as the second air supply channel 6, and the second air supply surface 304 may adopt a grid structure or a mesh structure.
More preferably, in the embodiment, with reference to fig. 2 and 4, the height of the central line of each circle of the outer air blowing channel 4 is lower than that of the central line of the corresponding circle of the particle conveying channel 3, so that the air enters the particle conveying channel 3 obliquely upwards, the upward air has a larger contact area with the downward particles, and the relative movement of the two is more beneficial to separating the dust from the plastic particles.
Specifically, in this embodiment, the powder removing channel may be cylindrical or rectangular, and the specific shape may be flexibly adjusted according to the difficulty of processing, and is not limited herein.
Preferably, in the present embodiment, the angle between each circle of the particle conveying channel 3 and the central line of the powder removing channel 1 is 15-45 degrees.
The included angle between the particle conveying channel 3 and the centerline of the powder removing channel 1 can be controlled, so that the residence time of the plastic particles in the particle conveying channel 3 can be controlled, and the action time between air and the plastic particles can be controlled. The included angle between the particle conveying channel 3 and the center line of the powder removing channel 1 is too large, the running speed of plastic particles is too high, and the dust removing efficiency is low; the included angle between the particle conveying channel 3 and the center line of the powder removing channel 1 is too small, the running speed of the plastic particles is too slow, and the production efficiency is low. In the present invention, the angle between each turn of the particle conveying channel 3 and the center line of the dusting channel 1 is preferably 30-40 °.
Further, combine fig. 2 and fig. 4, this gummer can also include interior air supply passageway 2, interior air supply passageway 2 and particle transfer passage 3 syntropy spiral winding are in gumming passageway 1's the outside, air supply passageway 2 sets up between particle transfer passage and the gumming passageway 1 that corresponds the circle in every circle, air supply passageway 2 and gumming passageway 1 intercommunication in every circle, air supply passageway 2 and particle transfer passage 3 that corresponds the circle in every circle are through first ventilation duct 5 intercommunication, the upper end and the lower extreme of interior air supply passageway 2 all seal the setting. The air that moves up meets with the particle of downward motion in particle transfer passage 3, and the air carries the less dust of quality in particle transfer passage 3 and enters into interior air supply passage 2 through first ventilation passageway 5, because interior air supply passage 2 and gumming passageway 1 intercommunication, the air that carries a large amount of dust gets into under the effect of pressure and mixes and rise in gumming passageway 1, escapes from air outlet 101 of gumming passageway 1 upper end.
In actual operation, the inner side of each circle of particle conveying channel 3 can be attached to the outer side of the corresponding circle of inner air supply channel 2, the parts of the particle conveying channels 3 attached to the inner air supply channels 2 can share one first ventilation surface 303, and a plurality of first ventilation holes are formed in the first ventilation surface 303 to serve as first ventilation channels; the inner side of the inner blowing channel 2 may be in full communication with the dusting channel 1. The first through cover 303 may have a grid structure or a mesh structure.
In specific operation, three air inlets 401 of the external air supply channel 4 may be provided, three air inlets 401 are provided on the lower side of the circle of the lowest end of the external air supply channel 4, and one air supply pipeline distributes the three air inlets 401.
On the other hand, the embodiment of the invention also provides a powder removing method, which adopts the powder remover to remove powder and comprises the following steps,
s1, adding plastic particles into a feed inlet of a particle conveying channel, and simultaneously blowing air into an air inlet of an external air blowing channel;
further, the maximum size of the plastic particles is less than 15mm.
In the art, the plastic particles may be spherical or cylindrical, where the maximum size of the plastic particles is typically less than 15mm, although other sizes of plastic particles are also suitable for use in the present invention.
Furthermore, the unit cross-sectional flux of the plastic particles is less than 500t/h, and the unit cross-sectional flux of the external air supply channel is less than or equal to 200000Nm 3 And h, the air supply pressure of the external air supply channel is less than or equal to 60KPa.
The above unit cross-sections all refer to 1 square meter.
The flow rate of the plastic particles and the air supply flow rate of the external air supply channel have the matching relation, and the solid-gas ratio of the air supply flow rate of the external air supply channel to the plastic particles is 0.817-2.735. The solid-gas ratio here refers to the ratio of the mass flow of the plastic particles to the mass flow of the conveying gas.
The dust removal rate is low due to too large flow of plastic particles, and the production efficiency is low due to too small flow of plastic particles; the air supply flow of the outer air supply channel is too large, the dust removal rate is not obviously improved, the air supply flow of the outer air supply channel is too small, and the dust removal efficiency is low.
S2, air in the external air supply channel enters the particle conveying channel from the second ventilation channel and acts with particles in the particle ventilation channel to carry away dust;
furthermore, the grain diameter of the dust is less than or equal to 500 mu m.
And S3, the air with the dust enters the powder removing channel through the first ventilation channel and is discharged from an air outlet of the powder removing channel.
The method for removing the powder provided by the invention will be further explained by combining specific examples.
Example 1
The powder remover is adopted for removing powder, and the process control of the powder removing process is as follows:
the maximum size of the plastic particles is 3.5mm-4.5mm, and the density is 1100Kg/m 3 The unit cross-sectional flux of the plastic particles is 480t/h, and the unit cross-sectional flux of the outer air supply channel is 180000Nm 3 The air supply pressure is 40.8KPa.
Example 2
The powder remover is adopted for removing powder, and the process control of the powder removing process is as follows:
the maximum size of the plastic particles is 5mm-6mm, and the density is 983Kg/m 3 The unit cross-sectional flux of the plastic particles is 200t/h, and the unit cross-sectional flux of the external air supply channel is 110000Nm 3 The blowing pressure was 41.6KPa.
Example 3
The powder remover is adopted for removing powder, and the process control of the powder removing process is as follows:
the maximum size of the plastic particles is 13mm-15mm, and the density is 915Kg/m 3 The unit section flux of the plastic particles is 200t/h, and the unit section flux of the outer air supply channel is 980000Nm 3 The blowing pressure was 47.7KPa. .
By using the dust removing methods provided in examples 1 to 3, the dust content of the plastic particles before dust removal was 3000ppm, 2000ppm and 1000ppm, the dust content of the plastic particles after dust removal was 142ppm, 34ppm and 28ppm, and the dust removal rate was 95.2%, 98.3% and 97.2%, respectively.
The invention adopts a space spiral structure with gradually changed base circle and lead, plastic particles move in a particle conveying channel of the space spiral through gravity flow, and the width and the angle of the particle conveying channel are designed to ensure that the plastic particles have enough residence time in the particle conveying channel and form proper material layer thickness. The lower extreme of the outer air supply channel that sets up at the spiral lets in the dusting wind, through setting up the distribution of dusting wind and adjusting the flow and the pressure of dusting wind, the dusting wind makes plastic pellet form the fluidization state in particle transfer passage to make the dust be taken away by the dusting wind separation, and discharge to interior air supply channel through the first ventilation passageway of particle transfer passage inner wall, finally converge and discharge behind the dusting passageway. The powder remover provided by the invention is used for removing dust from plastic particles, the powder removing rate can reach 95-99%, and the powder removing rate is high.
While the preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A powder remover is characterized in that the powder remover comprises an external air supply channel, a particle conveying channel and a powder removing channel, wherein,
the powder removing channel is vertically arranged, the lower end of the powder removing channel is arranged in a closed mode, and an air outlet is formed in the upper end of the powder removing channel;
the particle conveying channel and the outer air supply channel are spirally wound on the outer side of the powder removing channel in the same direction, each circle of the particle conveying channel is communicated with the powder removing channel through a plurality of first ventilation channels, and each circle of the outer air supply channel is communicated with the corresponding circle of the particle conveying channel through a plurality of second ventilation channels;
the upper end of the particle conveying channel is provided with a feeding hole, the lower end of the particle conveying channel is provided with a discharging hole, the lower end of the outer air supply channel is provided with an air inlet, and the upper end of the outer air supply channel is sealed.
2. A duster according to claim 1, wherein the cross-sectional dimensions of the first and second ventilation channels are less than the largest dimension of the particles transported by the particle transport channel.
3. The powder remover according to claim 2, wherein the distance between the central line of the outer air supply channel and the powder removing channel in each circle is larger than the distance between the central line of the particle conveying channel in the corresponding circle and the powder removing channel.
4. A powder remover according to claim 2, wherein the height of the centerline of each turn of said outer air supply channel is lower than the height of the centerline of the corresponding turn of said particle transport channel.
5. A powder remover according to claim 1, wherein the angle between each turn of said particle transporting channel and the centre line of said powder removing channel is 15-45 °.
6. A powder remover according to claim 5, wherein the angle between each turn of said particle transport channel and the centerline of said powder removal channel is 30-40 °.
7. The powder remover according to any one of claims 1-6, further comprising an inner air supply channel, wherein the inner air supply channel and the particle conveying channel are spirally wound on the outer side of the powder removing channel in the same direction, each circle of the inner air supply channel is arranged between the corresponding circle of the particle conveying channel and the powder removing channel, each circle of the inner air supply channel is communicated with the corresponding circle of the particle conveying channel through the first ventilation channel, and the upper end and the lower end of the inner air supply channel are sealed.
8. A method of removing powder by using a powder remover as claimed in any one of claims 1 to 7, said method comprising,
adding plastic particles into a feed inlet of the particle conveying channel, and simultaneously blowing air to an air inlet of the external air blowing channel;
air in the external air supply channel enters the particle conveying channel from the second ventilation channel and acts with particles in the particle ventilation channel to carry away dust;
and the air with the dust enters the powder removing channel through the first ventilation channel and is discharged from the air outlet of the powder removing channel.
9. A dust remover according to claim 8, wherein the largest dimension of said plastic particles is < 15mm, and the particle size of said dust is ≤ 500 μm.
10. The powder remover as claimed in claim 8, wherein the flux per unit cross-section of said plastic particles is less than 500t/h, and the flux per unit cross-section of said external air supply channel is less than or equal to 200000Nm 3 And h, the air supply pressure of the external air supply channel is less than or equal to 60KPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111070420.3A CN115805679A (en) | 2021-09-13 | 2021-09-13 | Powder remover and powder removing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111070420.3A CN115805679A (en) | 2021-09-13 | 2021-09-13 | Powder remover and powder removing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115805679A true CN115805679A (en) | 2023-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111070420.3A Pending CN115805679A (en) | 2021-09-13 | 2021-09-13 | Powder remover and powder removing method |
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| Country | Link |
|---|---|
| CN (1) | CN115805679A (en) |
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2021
- 2021-09-13 CN CN202111070420.3A patent/CN115805679A/en active Pending
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