CN101844133A - Air flow screening device for micron-sized powder materials - Google Patents
Air flow screening device for micron-sized powder materials Download PDFInfo
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- CN101844133A CN101844133A CN 201010162941 CN201010162941A CN101844133A CN 101844133 A CN101844133 A CN 101844133A CN 201010162941 CN201010162941 CN 201010162941 CN 201010162941 A CN201010162941 A CN 201010162941A CN 101844133 A CN101844133 A CN 101844133A
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- 238000012216 screening Methods 0.000 title claims abstract description 71
- 239000000463 material Substances 0.000 title claims abstract description 57
- 239000000843 powder Substances 0.000 title claims abstract description 31
- 238000007599 discharging Methods 0.000 claims abstract description 59
- 239000012530 fluid Substances 0.000 claims abstract description 53
- 238000009835 boiling Methods 0.000 claims abstract description 30
- 239000004744 fabric Substances 0.000 claims description 59
- 238000011010 flushing procedure Methods 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000006872 improvement Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 238000005243 fluidization Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 238000007873 sieving Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000008187 granular material Substances 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 238000005183 dynamical system Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000274582 Pycnanthus angolensis Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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Abstract
The invention relates to an air flow screening device for micron-sized powder materials, belonging to the screening technical field of powder engineering. The device is formed by improving the existing boiling dryer as follows: a front exhaust main pipe of the existing dryer is divided into a front exhaust main pipe and a back exhaust main pipe, a sieve plate mesh box with a sieve inside is added between the front exhaust main pipe and the back exhaust main pipe to increase the space dimensions of a fluid bed so as to increase the area of the sieve, so that the effective drift diameter of the sieve is increased, and the pore diameter of the sieve can be changed; a blowback device is added to prevent the sieve from being clogged; a circulating device is added to circulate the powder back to the main cavity of the fluid bed; and a pneumatic transmitting and discharging device is added on the basis of the original exhaust system. The device overcomes the defects that the existing boiling dryer can be only used for millimeter-sized particle materials due to the small sieve area and large meshes of the existing boiling dryer and powder materials are piled on the sieve and clog the sieve to block or even disable the air exhaust so as to affect the normal operation of the air jet screening when a small-pore sieve is used in the existing boiling drier. And the invention is applicable to the screening of powder materials.
Description
Technical field
The present invention relates to the equipment of micron-sized powder materials airflow screening, belong to fluidization field, Pneumatic Conveying Technology field, material sieving technology field, technical field of powder engineering.
Background technology
Granular material is sieved, the methods that adopt vibrosieve more, but concerning the little micron-sized powder materials of density, because screening efficiency is too low, can not obtain effect preferably, thereby developed a kind of method of airflow screening recently, " a kind of full circulation air flow powder sieving machine " (patent No.: 200610017573.0) be exactly a kind of air flow screening device as State Intellectual Property Office's mandate, the screen of this equipment utilization carrying object kinetic energy acting is sieved, and is suitable for the sieving and grading of the fine powder of various difficult sieves.But aborning, this air flow powder sieving machine also shows following weak point: 1, this air flow powder sieving machine and be not suitable for the screening of all powder materials, micron order material such as pollen pini in light weight for some, that particle diameter is little, screen cloth can stop up because of the accumulation of pollen pini cell on screen cloth, makes screening efficiency cross low and screening operation can't normally be carried out; 2, material sprayed net under the carrying of air-flow, and was unfavorable to the service life of screen cloth; The replacing of screen cloth and maintenance are also convenient inadequately.
Boiling drier is a kind of drying equipment commonly used at present, this equipment utilization thermal current makes material be in the fluidisation attitude of what is called " boiling ", thereby the heat and the moisture transmission of air-flow and storeroom have been strengthened, reach and make the quick-drying purpose of material, boiling drier is a kind of typical fluid bed, its structure comprises referring to Fig. 1:
The air inlet system of forming by cavity 6, fluid bed air inlet 10 at the bottom of air inlet 1, total air-adjusting shutter 2, air cleaner 3, air heater 4, the fluid bed; Wherein, total air-adjusting shutter 2 is used to regulate the pressure in intake, wind speed and the fluid bed, and air cleaner 3 is used to purify the air that enters in the fluid bed, and air heater 4 is used to add hot-air, and fluid bed air inlet 10 connects fluid bed main body and air inlet system.
The fluid bed main body of forming by metal perforated plate 7, fluid bed main cavity 16, fluid bed housing 17, discharge port 80, this is the major part of boiling drier, be material through place that action of high-speed airflow forms the fluidisation attitude and is dried, fluid bed housing 17 bottoms link to each other with fluid bed air inlet 10 by metal perforated plate 7, metal perforated plate 7 is also referred to as air distribution plate, the aperture that gathers on it so that air by the time form high velocity air, discharge port 80 is used for discharging.
The charging system of forming by reinforced motor 12, reductor 13, reinforced butterfly valve 14, charger 15, distributing device 8, material-feeding mechanism 9; Charging system is undertaken to the reinforced task of drying machine.Wherein, reductor 13 has two output shafts, a driving charger 15, and another root drives material-feeding mechanism 9.Reinforced butterfly valve 14 is equipped with in charger 15 hopper bottoms, both can regulate charging rate, and also air bleeds in order to prevent from not have material in the hopper.The driving shaft of material-feeding mechanism 9 passes fluid bed air inlet 10 and stretches in its cavity, drives distributing device 8 by a pair of bevel type gear, and the rotation of distributing device 8 makes material be evenly distributed on the metal perforated plate 7 and plays the effect of stirring material.
By the exhaust system that screen cloth 20, preceding air draft are responsible for 18, main air blower 34, muffler 33 and delivery pipe 42 are formed; Exhaust system is the dynamical system of boiling drier.The effect of muffler 33 is the noises that reduce blower fan, and screen cloth 20 is not taken away it in order to stop material by air-flow; Delivery pipe 42 is passing aways of air-flow.
Existing boiling drier also has instrument system: comprise thermocouple, components and parts such as wind speed, pressure measuring instruments.
The operation principle of existing boiling drier is: under the effect of main air blower 34, form negative pressure in the fluid bed; Air heater 4 will heat from air inlet 1 and through air cleaner 3 cleaned air passes, hot blast forms high velocity air by metal perforated plate 7 backs, the material that charger 15 is added in the fluid bed forms the fluidisation attitude, the material of fluidisation attitude fully contacts with hot blast, carry out heat and exchange of moisture fast, material is heated and is able to drying, and the moisture that evaporates is drained through exhaust system with air-flow, screen cloth 20 stops material is not taken away it by air-flow, dry materials is well back by outside the discharge port 80 discharge machines.
Existing boiling drier stops material makes it be not responsible for 18 interface in fluid bed housing 17 and preceding air draft by screen cloth 20 operated by rotary motion that air-flow is taken away, it is identical that 18 sections are responsible in this screen area size and preceding air draft, screen cloth 20 areas are too little, the aperture of screen cloth 20 is generally greater than 300 microns, so it is that the granular material of 0.3-6 millimeter carries out drying that existing boiling drier is mainly used in millimetre-sized granular material, particularly particle diameter.Existing boiling drier can not be used for screening operation, particularly can not be used for the screening of micron-sized powder materials, its reason is: in the fluidisation field, gravity is compared much smaller to the influence of the powder material motion of particle diameter below 300 microns with the influence of air-flow, powder material is under the effect of air-flow, mainly to screen movement.The aperture of existing boiling drier screen cloth 20 is generally greater than 300 microns, and powder material all passes screen cloth drains, and therefore existing boiling drier obviously is not suitable for powder material.Even the aperture of screen cloth 20 is replaced by the aperture that is suitable for powder material, but screen cloth 20 areas of existing boiling drier are too little, particle diameter can be deposited on the screen cloth 20 greater than the material of mesh size and block sieve screen apertures, the more important thing is, existing boiling drier does not prevent that screen cloth from stopping up and screen cloth stops up later on its device of dredging, the material that is deposited on the screen cloth 20 and stops up sieve screen apertures can make air draft smooth even can not air draft and airflow screening can't normally be carried out, thereby existing boiling drier also can not be used for powder material.
Summary of the invention
Purpose of the present invention is existing boiling drier is improved, and makes it to become a kind of screen strength height, is easy to change and can be used for the equipment that micron-sized powder materials sieves.
1), set up sieve plate net cage 19 outside fluid bed for realizing that the present invention will have boiling drier now and be used for purpose that micron-sized powder material is sieved, the present invention carries out following improvement to existing boiling drier:, and screen cloth 20 is placed in one; 2), set up the back-blowing device of forming by back-flushing valve 26, reverse-blow pipe 27, blowback wind adjusting flashboard 29, oscillator valve 30; 3), set up the EGR of forming by circulation airduct 23, circulated air adjusting flashboard 24, circulating fan 25; 4), on the preceding air draft person in charge 18, main air blower 34, muffler 33 and delivery pipe 42 bases of former exhaust system, discharging airduct 35, discharging butterfly valve 36, oversize bleeder 37, oversize discharging butterfly valve 38, oversize gatherer 32 and screenings bleeder 39, screenings discharging butterfly valve 40, screenings gatherer 41, discharging butterfly valve 43 have been set up, the common strength of forming is carried device for discharging, the preceding air draft person in charge 18 in the existing drying machine is divided into the preceding air draft person in charge 18 and the back air draft person in charge 31, and cancels the discharge port 80 that has boiling drier now; 5) air heater 4 in the cancellation dryer entrance system;
The structure of the device of being set up and and existing boiling drier each several part between annexation as follows:
The air draft person in charge 18 was responsible for 31 centre with the back air draft before described sieve plate net cage 19 was provided with and is fixed on, and this sieve plate net cage 19 is six casings, and its upper surface is airtight; Its left plate top has a hole and the preceding air draft person in charge's 18 the port of export to be connected, and its right plate bottom has a hole and the back air draft person in charge's 31 entrance point to be connected; The side plate place that keeps left on the top of the right plate of sieve plate net cage 19 and its lower end board also respectively has a hole, adopt to withhold between other four blocks of plates of its forward and backward biside plate 46 and casing to be tightly connected, on the sieve plate net cage 19 forward and backward biside plates 46 observation window 47 is installed respectively; The described screen cloth 20 that places in the sieve plate net cage 19 is connected and is convenient to sieve plate net cage 19 inner wall sealings around it and changes, on it forward air draft be responsible for 18 lopsidedness, lower end air draft backward is responsible for 31 lopsidedness and is positioned at the right side of institute's perforate on the lower end board.
The oscillator valve 30 of described back-blowing device is installed on the end that close sieve plate net cage 19 on 31 is responsible in the back air draft, the air outlet of described reverse-blow pipe 27 is connected with the hole that sieve plate net cage 19 right plate tops are opened, air inlet is located at the back of air cleaner 3 in the air inlet system, back-flushing valve 26, blowback wind are regulated flashboard 29, from sieve plate net cage 19 right edge, be located at the centre of reverse-blow pipe 27 successively.
The hole that the side plate place opens that keeps left on the air inlet of the circulation airduct 23 of described EGR and the lower end board of sieve plate net cage 19 is connected, and the air outlet of circulation airduct 23 passes the bottom of fluid bed housing 17, extend in the fluid bed main cavity 16.Circulated air adjusting flashboard 24 and circulating fan 25 are installed in the middle part of circulation airduct 23 successively from sieve plate net cage lower surface.
Described strength carries device for discharging except that the preceding air draft person in charge 18, main air blower 34, muffler 33 and the delivery pipe 42 of former exhaust system, also sets up discharging airduct 35, discharging butterfly valve 36, oversize bleeder 37, oversize discharging butterfly valve 38, oversize gatherer 32 and screenings bleeder 39, screenings discharging butterfly valve 40, screenings gatherer 41, discharging butterfly valve 43; The entrance point of described discharging airduct 35 is connected circulation airduct 23 cocycle wind and regulates before the flashboard 24, and the port of export is connected the back air draft and is responsible on 31 between the oscillator valve 30 and main air blower 34; Described discharging butterfly valve 36 is installed in the middle part of discharging airduct 35; Described oversize bleeder 37 and screenings bleeder 39 are told by delivery pipe 42 by threeway respectively, oversize discharging butterfly valve 38 and screenings discharging butterfly valve 40 are arranged respectively on it, oversize gatherer 32 and screenings gatherer 41 are installed in the end of oversize bleeder 37 and screenings bleeder 39 respectively, and can change, discharging butterfly valve 43 is installed on delivery pipe 42 ends.
When this equipment is used for the screening of micron-sized powder material, better implementation is the frame mode (seeing Fig. 4-6) that the sieve plate net cage system adopts two sieve plate net cages, that is: the sieve plate net cage composes in parallel the sieve plate net cage system by two identical and symmetrical branch roads of structure, and branch road comprises the screen cloth 20 in sieve plate net cage 19, back-flushing valve 26, oscillator valve 30 and the sieve plate net cage 19; Another branch road comprises another screen cloth 70 in another sieve plate net cage 56, another back-flushing valve 57, another oscillator valve 55 and the sieve plate net cage 56.Its annexation is: the preceding air draft person in charge's 18 the port of export linked to each other with the hole on the left plate top of sieve plate net cage 19 and another sieve plate net cage 56 by 58 whiles of air intake threeway; The back air draft person in charge's 31 entrance point is connected with the port of export of oscillator valve 30 and another oscillator valve 55 by air draft threeway 60 simultaneously; The port of export of reverse-blow pipe 27 is connected with the entrance point of back-flushing valve 26 and another back-flushing valve 57 by blowback wind threeway 59 simultaneously; The entrance point of circulation airduct 23 is connected with the keep left hole at side plate place on sieve plate net cage 19 and another sieve plate net cage 56 lower end board simultaneously by circulated air threeway 61; The import of oscillator valve 30 links to each other with the hole of sieve plate net cage 19 right plate bottoms; The import of another oscillator valve 55 links to each other with the hole of another sieve plate net cage 56 right plate bottoms; The outlet of back-flushing valve 26 links to each other with the hole on sieve plate net cage 19 right plate tops; The outlet of another back-flushing valve 57 links to each other with the hole on another sieve plate net cage 56 right plate tops; The port of export of discharging airduct is connected the back air draft and is responsible on 31 between the oscillator valve 30 and main air blower 34, after the air draft threeway 60.
For improving the intensity of screen cloth 20 anti-gas shocks, folder aperture screen cloth or filter cloth are made in the screen cloth of the two-layer macropore of screen cloth 20 usefulness, and aperture screen cloth or filter cloth are the screen clothes of screening machine, and the screen cloth of macropore plays protection aperture screen cloth.
The operation principle of this circulating current screening machine is:
The sieve plate net cage that is increased, because of being arranged on outside the fluid bed, on the one hand can increase its space geometry size and increase the area of screen deck net, thereby increased the screen cloth effective drift diameter, on the other hand, in screening process, can change the screen deck net of different size as requested easily to regulate the size of mesh size.
The effect of EGR is to send circulation screening again in the fluid bed main cavity with failing again back to by the material of screen deck net, and EGR is actually the device that prevents that screen deck net from stopping up, and EGR has further guaranteed the unobstructed of screen deck net.The air-flow branch that enters the sieve plate net cage is done two bursts of discharges, one carry the part particle diameter less than the material in screen deck net aperture by screen deck net, enter screenings gatherer 41 through the back air draft person in charge 31, main air blower 34, muffler 33, screenings bleeder 39; Another strand air-flow carries the material of failing by screen deck net and circulates again to enter through circulation airduct 23 and repeat screening in the fluid bed under the effect of circulating fan 25.
The effect of back-blowing device is to remove to be deposited in the material that stops up screen deck net on the screen deck net.During normal operation, most air enter in the fluid bed main cavity 16, make material form the fluidisation attitude; The small part air enters the blowback effect of the paired screen deck net of screen deck net box-shaped through reverse-blow pipe 27 when back-flushing valve is opened, thereby back-blowing device is actually the dredger of screen deck net, back-blowing device has reduced the obstruction of screen deck net greatly, has guaranteed the normal operation of circulating current screening machine.
The principle of device for discharging is that strength is carried.What need discharge during discharging is the material oversize by screen deck net of failing, open oversize discharging butterfly valve 38 successively, close screenings discharging butterfly valve 40, open discharging butterfly valve 36, close oscillator valve, extract fluidised material by main air blower 34, through discharging airduct 35, back air draft is responsible for 31, main air blower 34, and muffler 33 and oversize bleeder 37 enter oversize gatherer 32 and are collected.
The invention has the beneficial effects as follows: existing boiling drier has been done improvement by content of the present invention, after making it to become the circulating current screening machine, the sieve plate net cage system cooperates back-blowing device, EGR to solve the blockage problem of screen deck net effectively, therefore can adopt fine pore size is the screen cloth of high order number, makes the circulating current screening machine can be used in the screening processing of micron-sized powder materials.Because the screen cloth 20 that is installed in the sieve plate net cage 19 is convenient to change, so change the pore size of screen cloth 20, can sieve and obtain the different powder material of particle size.Because screen cloth 20 adopts the structure of folder one aperture screen cloth in the two-layer macropore screen cloth, both can make powder material be able to smooth screening, has improved the intensity of anti-gas shock again.
Description of drawings
Fig. 1 is the basic structure schematic diagram of existing boiling drier;
Fig. 2 is the structural representation of circulating current screening machine of the present invention.Among the figure, when two screen deck net box structure is adopted in the parenthesized expression of Reference numeral, the Reference numeral of another sieve plate net cage number;
Fig. 3 is the structural representation of single sieve plate net cage;
Fig. 4-the 6th, the annexation figure of two sieve plate net cage system each several parts.
Each Reference numeral is among the figure: 1, air inlet; 2, total air-adjusting shutter; 3, air cleaner; 4, air heater; 6, cavity at the bottom of the fluid bed; 7, metal perforated plate; 8, distributing device; 9, material-feeding mechanism; 10, fluid bed air inlet; 12, reinforced motor; 13, reductor; 14, reinforced butterfly valve; 15, charger; 16, fluid bed main cavity; 17, fluid bed housing; 18, preceding air draft is responsible for; 19, sieve plate net cage; 20, screen cloth; 23, circulation airduct; 24, circulated air is regulated flashboard; 26, back-flushing valve; 27, reverse-blow pipe; 29, blowback wind is regulated flashboard; 30, oscillator valve; 31, the back air draft is responsible for; 32, oversize gatherer; 33, muffler; 34, main air blower; 35, discharging airduct; 36, discharging butterfly valve; 37, oversize bleeder; 38, oversize discharging butterfly valve; 39, screenings bleeder; 40, screenings discharging butterfly valve; 41, screenings gatherer; 42, delivery pipe; 43, discharging butterfly valve; 46, sieve plate net cage side plate; 47, the observation window on the side plate; 55, another oscillator valve; 56, another sieve plate net cage; 57, another back-flushing valve; 58, air intake threeway; The threeway of 59-blowback wind; 60-air draft threeway; The threeway of 61-circulated air; 70, another screen deck net, 80, discharge port.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples, and among the embodiment, the sieve plate net cage adopts two screen deck net box structures.The structure of this equipment is seen accompanying drawing 2, is made of following several parts:
1), air inlet system: the function of air inlet system is to provide the air that makes material form the fluidisation attitude for the circulating current screening machine, air inlet system by air inlet 1, total air-adjusting shutter 2, air cleaner 3, fluid bed at the bottom of cavity 6, fluid bed air inlet 10 forms, the pressure in intake, wind speed and the screening machine is by total air-adjusting shutter 2 adjustings; Air cleaner 3 is used to purify the air that enters in the screening machine; Fluid bed air inlet 10 connects fluid bed and air inlet system.
2), fluid bed main body: comprise fluid bed main cavity 16, fluid bed housing 17, metal perforated plate 7.Fluid bed main cavity 16 is places that material forms the fluidisation attitude; Fluid bed housing 17 bottoms link to each other with fluid bed air inlet 10 by metal perforated plate 7; Circulation airduct 23 passes the bottom of fluid bed housing 17 and stretches in the fluid bed main cavity 16, and charger 15 also passes this housing and feeds in raw material; Metal perforated plate 7 is also referred to as air distribution plate, is a metallic plate, the aperture that gathers on it so that air by the time form high velocity air.
3), charging system: charging system is undertaken to the reinforced task of screening machine, form by reinforced motor 12, reductor 13, charger 15, reinforced butterfly valve 14, material-feeding mechanism 9, distributing device 8, reductor 13 has two output shafts, a driving charger 15, and another root drives material-feeding mechanism 9.Reinforced butterfly valve 14 is equipped with in charger 15 hopper bottoms, both can regulate charging rate, and also air bleeds in order to prevent from not have material in the hopper.Material-feeding mechanism 9 driving shafts pass fluid bed air inlet 10 and stretch in its cavity, drive distributing device 8 by a pair of bevel type gear, distributing device 8 is welded on the axle sleeve by bonding jumper and forms, distributing device 8 is by the bearings that is contained on the metal perforated plate 7, and the rotation of distributing device 8 makes material be evenly distributed on the metal perforated plate 7 and plays the effect of stirring material.
4), exhaust system: exhaust system is made up of the preceding air draft person in charge 18, the back air draft person in charge 31, main air blower 34, muffler 33, delivery pipe 42 and discharging butterfly valve 43, is the dynamical system of screening machine.The top that 18 entrance points are connected on fluid bed housing 17 is responsible in preceding air draft, and the port of export links to each other with the air intake threeway 58 of two sieve plate net cage systems; Back air draft is responsible for 31 entrance points and is linked to each other with the air draft threeway 60 of two sieve plate net cage systems, and the port of export links to each other with main air blower 34 air inlets; Delivery pipe 42 is connected on the end of exhaust system, and discharging butterfly valve 43 is contained in the end of delivery pipe 42.
5), sieve plate net cage: see accompanying drawing 3 one accompanying drawings 6, wherein, Fig. 3 is the simple sieve plate cage structure, and Fig. 4-6 is two sieve plate net cage each several part annexation figure.The sieve plate net cage is the improvement of being done at the screen cloth 20 of boiling drier specially for the technology purpose that realizes the circulating current screening, and purpose is the area that increases screen cloth, also makes things convenient for the replacing of screen deck net simultaneously.
The setting of sieve plate net cage and be fixed on before air draft be responsible for 18 and be responsible for 31 centre with the back air draft, see Fig. 2.Single screen deck net box structure is seen Fig. 3, and sieve plate net cage 19 is six casings, and its upper surface is airtight; The left plate top of sieve plate net cage 19 has a hole and the preceding air draft person in charge's 18 the port of export to be connected, and the right plate bottom of sieve plate net cage 19 has a hole and the back air draft person in charge's 31 entrance point to be connected; The side plate place that keeps left on the lower end board of the top of the right plate of sieve plate net cage 19 and sieve plate net cage 19 also respectively has a hole, adopt to withhold between other four blocks of plates of forward and backward biside plate 46 and casing to be tightly connected, on the sieve plate net cage 19 forward and backward biside plates 46 observation window 47 is installed respectively; Removable screen cloth 20 is installed in the described sieve plate net cage 19, and screen cloth 20 is the used screen clothes of screening operation.Screen cloth 20 is connected with sieve plate net cage 19 inner wall sealings all around and is convenient to be changed, and 18 lopsidedness are responsible in its upper end air draft forward, and 31 lopsidedness are responsible in lower end air draft backward.Keep left on the lower end board of described sieve plate net cage 19 hole at side plate place is positioned at the centre on screen cloth 20 and limit, left side.
Two sieve plate net cage systems of present embodiment then are made up of two identical and symmetrical branch roads of structure, a branch road comprises sieve plate net cage 19, back-flushing valve 26, oscillator valve 30, screen cloth 20 in the sieve plate net cage 19, another branch road comprise another sieve plate net cage 56, another back-flushing valve 57, another oscillator valve 55, another screen deck net 70 in another sieve plate net cage 56.Air draft was responsible for 18 and is responsible for 31 centre with the back air draft before these two branch roads were connected with air intake threeway 58, blowback wind threeway 59, air draft threeway 60, circulated air threeway 61, and its annexation is: preceding air draft is responsible for 18 the port of export and is linked to each other with the hole on the left plate top of sieve plate net cage 19, another sieve plate net cage 56 simultaneously by air intake threeway 58; The back air draft person in charge's 31 entrance point is connected with the outlet of oscillator valve 30, another oscillator valve 55 by air draft threeway 60 simultaneously; The port of export of reverse-blow pipe 27 is connected with the import of back-flushing valve 26, another back-flushing valve 57 by blowback wind threeway 59 simultaneously; The entrance point of circulation airduct 23 is connected with the keep left hole at side plate place on sieve plate net cage 19, another sieve plate net cage 56 lower end board simultaneously by circulated air threeway 61; The import of oscillator valve 30 links to each other with the hole of sieve plate net cage 19 right plate bottoms; The import of another oscillator valve 55 links to each other with the hole of another sieve plate net cage 56 right plate bottoms; The outlet of back-flushing valve 26 links to each other with the hole on sieve plate net cage 19 right plate tops; The outlet of another back-flushing valve 57 links to each other with the hole on another sieve plate net cage 56 right plate tops.The back air draft that the outlet of discharging airduct is connected on after the air draft threeway 60 is responsible on 31.The circulating current screening machine adopts two boxboard cage structure forms, and purpose is further guarantee current path in the operation process unimpeded.
Screen deck net is made with folder aperture screen cloth or filter cloth in the screen cloth of two-layer macropore, aperture screen cloth or filter cloth are the screen clothes of screening machine, screen deck net is installed in sieve plate net cage inside, and both make around it with the sealing of screen deck net chamber interior wall and be convenient to change screen cloth, 18 lopsidedness are responsible in its upper end air draft forward, 31 lopsidedness are responsible in lower end air draft backward, and are positioned at the right side in the hole on the sieve plate net cage lower surface.The screen deck net that multiple screen distance arranged is used to process the material of different-grain diameter for you to choose.
6), EGR: be made up of circulation airduct 23, circulation airduct regulator plate 24, circulating fan 25, its function is to improve the obstruction of screen deck net.23 imports of circulation airduct are joined with the circulated air threeway 61 of two sieve plate net cages, and fluid bed housing 17 is passed in outlet, stretches in the fluid bed main cavity 16, and circulation airduct regulator plate 24 can be regulated air circulation.
7), back-blowing device: back-blowing device is the dredger of screen deck net, and by two back-flushing valves, 26,57, two oscillator valves 30,55, reverse-blow pipe 27, blowback wind are regulated flashboard 29 and formed.Reverse-blow pipe outlet is joined with the blowback wind threeway 59 of two sieve plate net cage systems, and import is located in the air inlet system after the air cleaner 3.
8), device for discharging: what this process adopted is that strength is carried discharge way, and device for discharging is made up of the preceding air draft person in charge 18, the back air draft person in charge 31, main air blower 34, muffler 33, discharging airduct 35, discharging butterfly valve 36 and oversize bleeder 37, oversize discharging butterfly valve 38, oversize gatherer 32, screenings bleeder 39, screenings discharging butterfly valve 40, screenings gatherer 41 and delivery pipe 42.Discharging airduct 35 entrance points are connected on circulation airduct 23 cocycle wind and regulate before the flashboard 24, and outlet is responsible for 31 with the back air draft and is linked to each other, and discharging butterfly valve 36 is equipped with in the centre; Oversize bleeder 37, screenings bleeder 39 are told by delivery pipe 42 by threeway respectively, and oversize discharging butterfly valve 38 and screenings discharging butterfly valve 40 are arranged respectively on it.Oversize gatherer 32 is contained in the end of oversize bleeder 37, and screenings gatherer 41 is contained in the end of screenings bleeder 39, selects modular system according to the character and the particle diameter of institute's processing materials, can be deduster or filter bag.
9), instrument system: components and parts such as wind speed, pressure measuring instruments are installed in the circulating current screening machine, can cooperate as required corresponding conversion, demonstration, adjustment module are installed, realize the automatic control of airflow shifting machine technological parameter.The components and parts of instrument system are selected approved product for use.
Claims (3)
1. air flow screening device for micron-sized powder materials comprises: the air inlet system of being made up of cavity (6), fluid bed air inlet (10) at the bottom of air inlet (1), total air-adjusting shutter (2), air cleaner (3), the fluid bed; The fluid bed main body of forming by metal perforated plate (7), fluid bed main cavity (16), fluid bed housing (17); The charging system of forming by reinforced motor (12), reductor (13), reinforced butterfly valve (14), charger (15), distributing device (8), material-feeding mechanism (9); Be responsible for the exhaust system that (18), main air blower (34), muffler (33) and delivery pipe (42) are formed by preceding air draft; The instrument system of forming by wind speed, pressure measuring instruments; It is characterized in that: this equipment carries out following improvement to existing boiling drier: set up sieve plate net cage (19) outside fluid bed, and screen cloth (20) is placed in one; Set up the back-blowing device of forming by back-flushing valve (26), reverse-blow pipe (27), blowback wind adjusting flashboard (29), oscillator valve (30); Set up the EGR of forming by circulation airduct (23), circulated air adjusting flashboard (24), circulating fan (25); Be responsible on the basis of (18), main air blower (34), muffler (33) and delivery pipe (42) in the preceding air draft of former exhaust system, discharging airduct (35), discharging butterfly valve (36), oversize bleeder (37), oversize discharging butterfly valve (38), oversize gatherer (32), screenings bleeder (39), screenings discharging butterfly valve (40), screenings gatherer (41), discharging butterfly valve (43) have been set up, the common strength of forming is carried device for discharging, and the discharge port (80) of the existing boiling drier of cancellation; Air heater (4) in the cancellation dryer entrance system; The preceding air draft person in charge (18) who has now in the drying machine is divided into the preceding air draft person in charge (18) and the back air draft person in charge (31);
The structure of the device of being set up and and existing boiling drier each several part between annexation as follows:
(18) and the back air draft person in charge's (31) centre was responsible in air draft before described sieve plate net cage (19) was provided with and is fixed on, this sieve plate net cage (19) is six casings, its upper surface is airtight, the port of export that its left plate top has a hole and preceding air draft to be responsible for (18) is connected, the entrance point that its right plate bottom has a hole and back air draft to be responsible for (31) is connected, the side plate place that keeps left on the top of its right plate and its lower end board also respectively has a hole, before it, adopt to withhold between other four blocks of plates of back biside plate (46) and casing to be tightly connected, sieve plate net cage (19) is preceding, an observation window (47) is installed respectively on the back biside plate (46); The described screen cloth (20) that places in the sieve plate net cage (19), it is connected with sieve plate net cage (19) inner wall sealing all around and is convenient to changes, (18) lopsidedness is responsible in its upper end air draft forward, and lower end air draft backward is responsible for (31) lopsidedness and is positioned at the right side of institute's perforate on the lower end board;
The oscillator valve of described back-blowing device (30) is installed on the back air draft and is responsible for the end that (31) go up close sieve plate net cage (19), the air outlet of described reverse-blow pipe (27) is connected with the hole that sieve plate net cage (19) right plate top is opened, the air inlet of reverse-blow pipe (27) is located at the back of air cleaner (3) in the air inlet system, back-flushing valve (26), blowback wind are regulated flashboard (29), from sieve plate net cage (19) right edge, be located at the centre of reverse-blow pipe (27) successively;
The hole that the side plate place opens that keeps left on the air inlet of the circulation airduct (23) of described EGR and the lower end board of sieve plate net cage (19) is connected, the air outlet of circulation airduct (23) passes the bottom of fluid bed housing (17), extend in the fluid bed main cavity (16); Circulated air adjusting flashboard (24) and circulating fan (25) are installed in the middle part of circulation airduct (23) successively from sieve plate net cage lower surface;
Described strength is carried the entrance point of the discharging airduct (35) of device for discharging to be connected circulation airduct (23) cocycle wind and is regulated before the flashboard 24, and the port of export is connected the back air draft person in charge (31) and goes up between oscillator valve (30) and the main air blower (34); Described discharging butterfly valve (36) is installed in the middle part of discharging airduct (35); Described oversize bleeder (37) and screenings bleeder (39) are told by delivery pipe (42) by threeway respectively, oversize discharging butterfly valve (38) and screenings discharging butterfly valve (40) are arranged respectively on it, oversize gatherer (32) and screenings gatherer (41) are installed in the end of oversize bleeder (37) and screenings bleeder (39) respectively, and can change; Discharging butterfly valve (43) is installed on delivery pipe (42) end.
2. air flow screening device for micron-sized powder materials according to claim 1, it is characterized in that: described sieve plate net cage adopts two screen deck net box structures: two sieve plate net cages compose in parallel the sieve plate net cage system by two identical and symmetrical branch roads of structure, and branch road comprises the screen cloth (20) in sieve plate net cage (19), back-flushing valve (26), oscillator valve (30) and the sieve plate net cage (19); Another branch road comprises another screen cloth (70) in another sieve plate net cage (56), another back-flushing valve (57), another oscillator valve (55) and the sieve plate net cage (56); Its annexation is: the port of export that (18) are responsible in preceding air draft linked to each other with the hole on the left plate top of sieve plate net cage (19) and another sieve plate net cage (56) by air intake threeway (58) while; The entrance point that (31) are responsible in back air draft is connected with the port of export of oscillator valve (30) and another oscillator valve (55) by air draft threeway (60) simultaneously; The port of export of reverse-blow pipe (27) is connected with the entrance point of back-flushing valve (26), another back-flushing valve (57) by blowback wind threeway (59) simultaneously; The entrance point of circulation airduct (23) is connected with the keep left hole at side plate place on sieve plate net cage (19) and another sieve plate net cage (56) lower end board simultaneously by circulated air threeway (61); The import of oscillator valve (30) links to each other with the hole of sieve plate net cage (19) right plate bottom; The import of another oscillator valve (55) links to each other with the hole of another sieve plate net cage (56) right plate bottom; The outlet of back-flushing valve (26) links to each other with the hole on sieve plate net cage (19) right plate top; The outlet of another back-flushing valve (57) links to each other with the hole on another sieve plate net cage (56) right plate top; The port of export of discharging airduct is connected the back air draft person in charge (31) and goes up between oscillator valve (30) and the main air blower (34), and air draft threeway (60) afterwards.
3. air flow screening device for micron-sized powder materials according to claim 1 and 2 is characterized in that: screen cloth (20) adopts the structure of pressing from both sides the aperture screen cloth in the screen cloth of two-layer macropore.
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| CN2010101629417A CN101844133B (en) | 2010-05-05 | 2010-05-05 | Air flow screening device for micron-sized powder materials |
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| CN2010101629417A CN101844133B (en) | 2010-05-05 | 2010-05-05 | Air flow screening device for micron-sized powder materials |
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| CN101844133B CN101844133B (en) | 2012-09-05 |
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