CN216224797U - Semi-finished product thickness separation selection powder machine with keep off material awl - Google Patents
Semi-finished product thickness separation selection powder machine with keep off material awl Download PDFInfo
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- CN216224797U CN216224797U CN202121668264.6U CN202121668264U CN216224797U CN 216224797 U CN216224797 U CN 216224797U CN 202121668264 U CN202121668264 U CN 202121668264U CN 216224797 U CN216224797 U CN 216224797U
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Abstract
The utility model discloses a semi-finished product thickness separation powder concentrator with a material blocking cone, which comprises a shell, wherein a guide vane, a cage-shaped rotor and a driving device for driving the cage-shaped rotor to rotate are arranged in the shell; a static powder selecting area is formed between the flow guide device and the shell; a material blocking cone is arranged at the bottom of the flow guide device; a secondary air supply port entering tangentially is arranged below the material blocking cone; the bottom of the material blocking cone is provided with a blowing air ring. On the basis of the traditional dynamic powder concentrator, a static powder concentration area is added, and the internal structure of the static powder concentration area is controlled to form a gradient section wind speed, so that coarse particles in a semi-finished product are separated according to a target particle size; and meanwhile, the materials falling into the collecting cone are purged again, so that the powder selecting efficiency of the static powder selecting area is further improved, the efficiency of the dynamic powder selecting machine is improved, and the energy consumption of a grinding system is reduced.
Description
Technical Field
The utility model belongs to the technical field of grinding, and particularly relates to a semi-finished product thickness separation powder concentrator with a material blocking cone.
Background
The powder selecting machine is a device for sorting materials by air media, is an important component of a grinding system, and directly influences the technical and economic indexes of the whole system when the performance of the powder selecting machine is good. The existing dynamic powder selecting machine uses a cage type rotor formed by different blade structure types as a core component, and the cage type rotor rotates at a high speed to generate rotating airflow to form a dynamic powder selecting area. After the particles to be selected enter the dynamic powder selecting area, under the balance action of centrifugal force, airflow drag force and self gravity, the coarse particles fall into a discharge hopper to form a return material, and the fine particles move towards the center of the cage-shaped rotor and are discharged through an airflow outlet to form a finished product. The cyclic load is the ratio of the returned material amount of the powder concentrator to the finished product amount, and the higher the powder concentration is, the lower the powder concentration efficiency is, and the larger the cyclic load is.
The semi-finished product refers to a material from which large particles are removed by early separation, the traditional semi-finished product separation directly brings the part of the semi-finished product into a dynamic powder concentrator along with airflow for coarse and fine separation, and the process has the following defects: the semi-finished products brought into the dynamic selection area still contain a certain amount of coarse particles, the finished products selected by the dynamic powder selector have coarse phenomena with different degrees, and the rotating speed of the powder selector is inevitably increased in order to control the fineness of the finished products in operation, so that the powder selection efficiency is reduced, and the cyclic load is increased; the semi-finished product has large material quantity, high powder concentration, relatively lower powder selection efficiency and increased cyclic load.
The powder concentrator based on semi-finished product thickness separation is designed and developed to solve the problems, firstly, the dynamic powder concentrator is used for primary pre-separation, so that the fineness of the fed and dynamically-selected materials is thinner, and the finished products selected by the dynamic powder concentrator are thinner; and secondly, the total amount of the fed materials for dynamic selection is reduced, the powder selection concentration is smaller under the condition of certain air quantity, the powder selection efficiency is higher, the cyclic load is reduced, and the energy efficiency of the powder selecting machine is obviously improved.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a semi-finished product thickness separation powder concentrator with a material blocking cone, which is characterized in that a static powder selection area is added on the basis of the traditional dynamic powder concentrator, a gradient section wind speed is formed by controlling the internal structure of the static powder selection area, so that coarse particles in a semi-finished product are separated in advance according to a target particle size, meanwhile, a blow washing wind ring and a secondary air supply opening are arranged below the static powder selection area, and coarse materials falling into the material collecting cone are blown washed again, so that the thickness separation efficiency and the separation definition of the static powder selection area are further improved, the efficiency and the separation definition of the dynamic powder concentrator are improved, and the energy consumption of a grinding system is reduced.
The utility model is realized in such a way that the semi-finished product thickness separating powder selecting machine with the material blocking cone; the coarse powder discharging device comprises a shell, wherein the shell consists of an upper shell, a middle shell and a lower shell, a coarse powder discharging port is arranged at the bottom of the lower shell, an air inlet is formed in the side wall of the middle shell along the tangential direction, guide vanes are arranged on the outer ring of the middle part of the upper shell, a cage-shaped rotor is connected in the middle of the upper shell, and an air outlet is formed above the cage-shaped rotor; a driving device for driving the cage-shaped rotor to rotate is arranged above the air outlet, and a dynamic powder selecting and returning discharge hopper is arranged below the guide vanes in the shell; a material blocking cone is added at the bottom of the flow guide device, a lower waist surface formed between the flow guide device and the material blocking cone is lower than the bottom plane of the air inlet, and the lower end surface of the material blocking cone is positioned at the middle upper position of the vertical height of the lower shell; a static powder selecting area is formed between the flow guide device and the shell; a secondary air supply port entering tangentially is arranged on the side wall of the lower shell, and the secondary air supply port is positioned below the material blocking cone; blow and wash the wind ring in the region setting between keeping off material awl bottom and the lower casing, blow and wash wind ring and be located secondary air supplement mouth top.
On the basis of the traditional dynamic powder concentrator, the static powder concentrator is additionally provided with the static powder concentrator, the gradient section air speed is formed by controlling the internal structure of the static powder concentrator, so that coarse particles in a semi-finished product are separated according to the target particle size, meanwhile, a secondary air supply opening and a blow-washing air ring are arranged in the static powder concentrator, and the materials falling into the collecting cone are blown and washed again, so that the powder concentration efficiency of the static powder concentrator is further improved, the efficiency of the dynamic powder concentrator is improved, and the energy consumption of a grinding system is reduced.
Preferably, the diversion device adopts a conical diversion cylinder, and an included angle alpha between the conical diversion cylinder and a horizontal line is 45-80 degrees.
According to the preferred technical scheme, the distance H between the lower waist surface formed between the flow guide device and the material blocking cone and the bottom of the air inlet20-500 mm, and the section wind speed V between the lower waist surface and the shell3＝4～6m/s。
The technical scheme is preferable, and the radial included angle theta of the entry point of the secondary air supplementing opening145-60 degrees; and 2-8 secondary air supply ports are arranged along the circumferential direction.
The air purging ring comprises an air purging ring inner ring, an air purging ring outer ring and a plurality of air ring air guiding scattering plates which are obliquely arranged between the air purging ring inner ring and the air purging ring outer ring.
Preferably, the wind ring wind guide breaks up the plate gap wind speed V43-5 m/s; inclination angle theta of wind ring wind guide scattering plate220-60 degrees; the ratio S of the length of the horizontal projection of two adjacent overlapped scattering plates of the wind ring wind guide scattering plate to the length of the horizontal projection of a single scattering plate1:S2＝0.25～0.5。
According to the preferable technical scheme, the angles of the inner ring and the outer ring of the purging air ring are consistent with the angle of the blanking cone.
The utility model has the advantages and technical effects that: the principle of the utility model is different from the principle of the traditional dynamic powder concentrator and is mainly characterized in that: 1) a static powder selecting area is added in the front-stage process of the dynamic powder selecting area, so that materials are subjected to primary pre-selection before entering the dynamic powder selecting area; 2) a static powder selecting area formed by a conical flow guide device and a shell forms gradient section wind speed of an airflow channel by controlling the angle alpha of the flow guide device, so that the coarse and fine separation of semi-finished product particles is realized; 3) a material blocking cone is arranged at the lower part of the flow guide device to separate the static powder selecting area from a material discharging area at the lower part, so that coarse particles entering the material discharging area are prevented from being influenced by airflow of the static powder selecting area to turn back upwards again; 4) secondary air supplement blowing washing is carried out on descending particles entering a discharging area, and powder selection definition is improved; 5) set up between keeping off material awl and casing and blast the wind ring, break up the granule that will get into the discharge area region, the overgrate air of being convenient for blasts the effect, and is favorable to stabilizing the unloading.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a structural parameter diagram of the present invention;
FIG. 3 is a sectional view taken along line A-A of FIG. 2, illustrating the design of the secondary air supply inlet and the single air inlet of the present invention;
FIG. 4 is a schematic view of the secondary air supply port design and dual air inlets of the present invention;
FIG. 5 is a cross-sectional view B-B of FIG. 1, showing the purge air ring arrangement of the present invention;
FIG. 6 is a structural parameter diagram of the purge air ring of the present invention;
FIG. 7 is a schematic diagram of a CFD velocity field structure according to the present invention;
FIG. 8 is a schematic diagram of the CFD calculation of seven particle distributions in the apparatus according to the present invention.
In the figure, 1aAn upper shell; 1bA middle shell; 1cThe lower shell (a material collecting cone), 2 and a driving device; 3. a drive shaft; 4. a guide vane; 5. a cage rotor; 6. a dynamic powder selecting and returning discharge hopper; 7. a flow guide device; 8. an air inlet; 9. an air outlet; 10. a coarse powder discharge hole; 11. a static powder selecting area; 12. a dynamic powder selecting area; 13. a secondary air supply port; 14. blocking the material cone; 15. purging the air ring; 15-1, wind ring wind guide scattering plate; 15-2, purging the inner ring of the air ring; 15-3 and an outer ring of the wind ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1 to 6, a semi-finished product thickness separating powder concentrator with a material blocking cone comprises a powder concentrator casing divided into an upper casing 1a and a middle casing 1bAnd a lower shell (material collecting cone) 1c(ii) a The bottom of the lower shell is connected with a coarse powder discharge hole 10; the air inlet 8 tangentially enters the middle shell 1bThe air inlet 8 can be a single air inlet type or a double air inlet type; the middle part of the upper shell 1a is provided with a guide vane 4 which is internally connected with a cage type rotor 5, and a dynamic powder selecting area 12 is formed between the guide vane and the cage type rotor; the air outlet 9 is positioned at the upper part of the powder concentrator; the cage rotor is driven by a driving device 2 arranged at the upper part of an air outlet 9 of the powder concentrator to drive a transmission shaft 3 to rotate together; the lower part of the guide vane 4 is connected with a dynamic powder selecting and returning discharge hopper 6, a guide device 7 is arranged outside the dynamic powder selecting and returning discharge hopper 6 and is positioned at the lower part of the guide vane 4 together with the discharge hopper 6, and a static powder selecting area 11 is formed between the guide device and the shell; the lower part of the flow guide device 7 is connected with a material blocking cone 14; the lower end of the flow guide device 7 extends to the lower shell (material collecting cone) 1cIn the area, the lower waist surface formed between the flow guide device 7 and the material blocking cone 14 is lower than the bottom plane of the air inlet 8; the lower end surface of the material blocking cone 14 is positioned on the lower shell 1cThe middle of the vertical height is higher than the upper position; the secondary air supply inlet 13 tangentially enters the lower shell (material collecting cone) 1cThe secondary air supply opening 13 is arranged below the material blocking cone 14; a purge air ring 15 is arranged in the area between the bottom of the material blocking cone 14 and the lower shell 1c, and the purge air ring 15 is positioned above the secondary air supply opening 13.
Preferably, in the above technical scheme, an included angle α between the flow guide device 7 and the horizontal line is 45-80 °.
Preferably, the distance H2 between the lower waist surface formed between the flow guide device 7 and the material blocking cone 14 and the bottom of the air inlet 8 is 0-500 mm, and the section air speed V between the lower waist surface and the shell is3＝4～6m/s。
The preferable technical scheme is that the secondary air supply opening13 radial included angle theta of entry point145-60 degrees; and 2-8 secondary air supply openings 13 are formed in the circumferential direction.
Preferably, the wind ring wind guide scattering plate 15-1 has a gap wind speed V43-5 m/s; the wind ring wind guide scattering plate 15-1 has an inclination angle theta220-60 degrees; the ratio S of the length of the horizontal projection of two adjacent overlapped scattering plates of the wind ring wind guide scattering plate to the length of the horizontal projection of a single scattering plate1:S2＝0.25～0.5。
Preferably, in the technical scheme, the inner ring of the purge air ring has an angle theta of 15-2 degrees3Not exceeding 15-3 degrees beta of the outer ring, preferably satisfying theta3＝(0.7±0.2)β。
The utility model also discloses a design method of the semi-finished product thickness separation powder concentrator with the material blocking cone, which is characterized by comprising the following steps of:
the following technological structure parameters are set: design ability T (T/h) of powder concentrator, and suitable concentration C (g/m) of powder concentration for different materials3) Air quantity Q (m) of powder concentrator3H), rotor diameter Dr(mm), rotor height Hr(mm), rotor radial wind velocity Vr(m/s), rotor height to diameter ratio ζ1Diameter D of outer end of guide vanev(mm), vertical wind velocity V selected by entering into and moving1(m/s), the upper surface of the air inlet corresponds to the section wind speed V between the shell and the flow guide device2(m/s), wind velocity V of the air inletin(m/s) wind speed V of secondary air supply inlets(m/s), the diameter D of the corresponding shell at the bottom of the guide vane1(mm), height H of air inlet3(mm), width of air intake B3(mm), air inlet aspect ratio ζ2The upper surface of the air inlet corresponds to the diameter D of the column section of the shell2(mm), the upper surface of the air inlet corresponds to the upper diameter D of the flow guide device2in(mm), diameter D of lower part of guide cone3in(mm), the included angle beta (DEG) between aggregate cone and horizontal line, and the wind speed V of lower shell3(m/s), lower housing diameter D3(mm), the included angle eta (degree) between the dynamic powder selecting and returning discharge hopper and the horizontal line, and the diameter D of the column section of the discharge hopper5(mm), diameter D of discharge port6(mm), discharge port material quantity Td(t/h), discharge port material speed Vp(m/s)，Material volume weight rho (t/m)3) Material porosity epsilon, distance H between dynamic powder selection and material return discharge hopper and discharge port1(mm), diameter D of secondary air supply port4(mm), the number N of secondary air supply ports1Second air supply direction angle theta1(°) secondary air supply port distance blow washing air ring H4(mm), the horizontal clearance d between the material blocking cone and the lower shell1(mm), an included angle delta (°) between the material blocking cone and the horizontal line, a distance h (mm) between the upper end of the flow guide device and the upper end of the air inlet, a height H (mm) of the flow guide device, and a diameter D of the bottom of the flow guide device3in(mm), height H of blowing ring5(mm), the number N of wind ring wind-guiding scattering plates2The distance d between the wind ring and the wind deflector2(mm), length d of wind ring wind-guiding scattering plate3(mm) angle of inclination theta of wind ring wind-guiding scattering plate2(°) purging air ring inner ring cone angle theta3(degree), the overlapped horizontal projection length S of the wind guide scattering plates of the adjacent wind rings1(mm), horizontal projection length S of wind ring wind-guiding scattering plate2(mm)。
The design method specifically comprises the following steps:
1) calculating air quantity Q (m) of powder concentrator3/h)：
Q＝T/C×106；
2) Calculating the diameter D of the rotorr(mm)：
Therein, ζ1＝Hr/Dr＝0.4～0.6；Vr＝2～5m/s；
3) Calculating the diameter D of the outer end of the guide vanev＝Dr+(200～400)mm；
4) Calculating the diameter D of the corresponding shell at the bottom of the guide vane1(mm)：
Wherein, according to different material conditions, V is taken1＝7～10m/s；
5) Taking the distance h between the upper end of the flow guide device and the upper end of the air inlet to be 200-500 mm;
6) taking an included angle alpha between the flow guide device and a horizontal line to be 45-80 degrees;
7) calculating the diameter D of the circumferential section of the air inlet upper surface corresponding to the flow guide device2in(mm)：
D2in＝Dv-2h/tanα
8) Calculating the diameter D of the upper surface of the air inlet corresponding to the column section of the shell2(mm)：
Wherein, according to different material conditions, V is taken2＝6～8m/s；
9) Air inlet height-width ratio zeta2＝H3/B3＝1.0～1.5；
10) Calculating the height H of the air inlet3(mm)：
Wherein, take Vin＝10～20m/s；
11) Taking down the shell, wherein the angle beta of the aggregate cone is 45-80 degrees;
12) calculating the material quantity T at the discharge portd＝(0.5～1.5)T(t/h)；
13) Calculating the diameter D of the discharge hole6(mm)：
Wherein, take Vp＝0.5～1.5m/s，ε＝0.5～1.0；
14) Distance H between discharge hopper and discharge port for taking dynamic powder selection and returning1＝300～500mm；
15) Column section diameter D of dynamic powder selecting and returning discharge hopper5＝D6- (200-300) mm; dynamic powder selecting and returning discharge hopper and waterThe included angle eta of the flat line is 35-70 degrees;
16) distance H between lower end of flow guide device and bottom of air inlet2＝0～500mm；
17) Calculating the height H of the flow guiding device H + H3+H2(mm)；
18) Calculating the diameter D of the bottom of the flow guiding device3in(mm)：
D3in＝DV-2H/tanα；
19) Calculating the lower housing diameter D3(mm):
Wherein V3＝4～6m/s；
20) Get and keep off material awl and lower casing horizontal clearance d1＝200～300mm；
21) Taking an included angle delta between the material blocking cone and a horizontal line, wherein the included angle delta is 35-70 degrees;
22) calculating the height H of the blow washing air ring5＝(0.5～1.0)d1(mm)；
23) Inclination angle theta of wind-guiding scattering plate of wind-taking ring2＝20～60°；
24) Purging air ring inner ring taper angle theta3＝(0.7±0.2)β；
25) Calculating the length d of the wind ring wind-guiding scattering plate3＝H5/sinθ2(mm)；
26) Calculating the distance d between the wind-guiding and scattering plates of the wind ring2(mm)：
d2＝(1-S1/S2)H5 cosθ2；
Wherein S is1/S2＝0.25～0.5；
27) Air quantity Q of secondary air supply opening2＝(10～30％)Q(m3/h)；
28) Calculating the number N2 of the wind guide scattering plates of the wind ring:
wherein, V4＝3～5m/s；
29) Calculating the diameter D of the secondary air supply inlet4(mm)：
Wherein, take Vs＝15～18m/s，N1An integer of (2-8);
30) blow wash air ring H for distance of secondary air supply opening4＝D4+(0～500)mm。
31) Secondary air supply direction angle theta1＝45～60°。
The utility model adds a static powder selecting area 11 in the front section process of the dynamic powder selecting machine, and the static powder selecting area is formed by the space between the conical flow guide device 7 and the shell. The semi-finished product material is carried by airflow and tangentially enters a static powder selecting area of the powder selecting machine through the air inlet 8. The airflow entering the static powder selecting area has tangential initial speed, the material particles do circular motion along with the airflow, and at the moment, the particles are mainly subjected to gravity G and centrifugal force FcAirflow drag force FdThe combined action of the two movements is sedimentation movement and centrifugal movement.
The gradient section wind speed of the static separation area is controlled by controlling the angle of the flow guide device 7, and the airflow drag force F corresponding to different wind speedsdDifferent, the materials are graded according to the following conditions:
1) for Fd＜G+FcThe resultant particles are in spiral sedimentation motion under the action of the resultant force. As the height of the particles decreases, they are subjected to an airflow drag force FdThis in turn causes the downward acceleration of this portion of particles to increase, accelerating their settling process. The secondary air supply opening 13 which is inclined upwards blows and blows the sunk particles again, fine particles which are mixed among coarse particles and adhered to the surfaces of the coarse particles rise after being blown by secondary air and enter dynamic separation, the separation definition is improved, and the coarse particles are finally settled to the bottom and discharged through a coarse powder discharge opening 10.
2) For Fd≥G+FcThe resultant particles are in spiral ascending motion under the action of the resultant force. As the height of the particles rises, they are subjected to an airflow drag force FdThe acceleration of the part of the particles is increased, and the ascending process of the part of the particles is accelerated. The particles enter a dynamic powder selecting area between the guide vanes 4 and the cage-shaped rotor 5 upwards, thicker particles collide with the guide vanes 4 on the side wall under the action of centrifugal force and are discharged downwards through the dynamic powder selecting and returning discharge hopper 6 under the action of gravity, and fine particles enter the cage-shaped rotor 5 under the action of radial airflow drag force and are finally discharged through the air outlet 9.
The principle of the utility model is different from the principle of the traditional dynamic powder concentrator and is mainly characterized in that: 1) a static powder selecting area is added in the front-stage process of the dynamic powder selecting area, so that materials are subjected to primary pre-selection before entering the dynamic powder selecting area; 2) a static powder selecting area formed by a conical flow guide device and a shell forms gradient section wind speed of an airflow channel by controlling the angle alpha of the flow guide device, so that the coarse and fine separation of semi-finished product particles is realized; 3) a material blocking cone is arranged at the lower part of the flow guide device to separate the static powder selecting area from a material discharging area at the lower part, so that coarse particles entering the material discharging area are prevented from being influenced by airflow of the static powder selecting area to turn back upwards again; 4) set up secondary between guide cone and lower casing and blow and select wind ring, break up, blast the dispersion to the descending granule that gets into the material discharge region for mix with between the coarse grain and the fine particle of adhesion in the coarse grain surface obtains secondary separation, improves the selection powder definition.
In order to verify the key technical points of the core of the utility model in principle, a calculation model of a static powder selecting area is constructed according to a design method, the selection efficiency of semi-finished product particles is numerically solved by adopting a CFD theoretical calculation method under the same working condition by using different scheme models, and the calculation boundary conditions and the calculation results are as follows:
TABLE 1 calculation of boundary conditions
Note: and the secondary air supply port automatically calculates the air supply amount according to the negative pressure of the equipment through a program. The diameter of the air supply opening is 500 mm.
Table 2 simulation calculation data of particle sorting efficiency of semi-finished product according to the patent scheme
| Parameter(s) | Examples |
| Particle size | Output efficiency/% |
| 10um | 99.9 |
| 30um | 95.6 |
| 45um | 87.2 |
| 80um | 68.9 |
| 0.2mm | 16.1 |
| 0.5mm | 0.2 |
| 1.5mm | 2.0 |
The selection efficiency refers to the ratio of the mass flow of each particle diameter particle after leaving the stationary blade to the mass flow of the feed inlet thereof
Only 16% of particles with the particle size of 0.2mm enter the stationary blade to participate in the subsequent dynamic powder selection process; that is to say, the particles with the diameter of more than 0.5mm do not participate in the subsequent dynamic powder selection process basically; particles below 80um almost enter the dynamic powder selecting area. Coarse particles with the particle size of more than 0.5mm enter a static sorting area in front of a dynamic powder sorting area from an air inlet in a tangential direction, most of the coarse particles fall into a lower shell (material collecting cone) 1c, and the distribution of velocity vector diagrams and seven particles in equipment can be clearly verified from the velocity vector diagrams of figures 7-8.
Coarse particles with the particle size of more than 0.5mm basically do not participate in dynamic separation, the concentration of dynamic powder separation is reduced by more than 50%, and the powder separation efficiency of particles with the particle size of less than 80 microns is improved by 20-25%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A semi-finished product thickness separation powder concentrator with a material blocking cone comprises a shell, wherein the shell consists of an upper shell, a middle shell and a lower shell, a coarse powder discharge hole is formed in the bottom of the lower shell, an air inlet is formed in the side wall of the middle shell in the tangential direction, a guide vane is arranged on the outer ring of the middle of the upper shell, a cage-shaped rotor is connected in the middle of the upper shell, and an air outlet is formed above the cage-shaped rotor; a driving device for driving the cage-shaped rotor to rotate is arranged above the air outlet, and a dynamic powder selecting and returning discharge hopper is arranged below the guide vanes in the shell, and the powder selecting and returning discharge hopper is characterized in that a conical guide device is sleeved outside the dynamic powder selecting and returning discharge hopper below the cage-shaped rotor, the guide device adopts a conical guide cylinder, and the included angle alpha between the conical guide cylinder and the horizontal line is 45-80 degrees; the lower end of the flow guide device extends to the lower shell area, and the lower end surface of the flow guide device is positioned above the discharge opening of the dynamic powder selecting and returning discharge hopper; a material blocking cone is added at the bottom of the flow guide device, a lower waist surface formed between the flow guide device and the material blocking cone is lower than the bottom plane of the air inlet, and the lower end surface of the material blocking cone is positioned at the middle upper position of the vertical height of the lower shell; a static powder selecting area is formed between the flow guide device and the shell; a secondary air supply port entering tangentially is arranged on the side wall of the lower shell and is positioned below the material blocking cone; blow and wash the wind ring in the region setting between keeping off material awl bottom and the lower casing, blow and wash wind ring and be located secondary air supplement mouth top.
2. The semi-finished product thickness separation powder concentrator with the material blocking cone as claimed in claim 1, is characterized in that: the distance H between the lower waist surface formed between the flow guide device and the material blocking cone and the bottom of the air inlet20-500 mm, and the section wind speed V between the lower waist surface and the shell3＝4～6m/s。
3. The semi-finished product thickness separation powder concentrator with the material blocking cone as claimed in claim 1, is characterized in that: radial included angle theta of entry point of secondary air supply port145-60 degrees; and 2-8 secondary air supply ports are arranged along the circumferential direction.
4. The semi-finished product thickness separation powder concentrator with the material blocking cone as claimed in claim 1, is characterized in that: the air purging ring comprises an air purging ring inner ring, an air purging ring outer ring and a plurality of air ring air guiding scattering plates which are obliquely arranged between the air purging ring inner ring and the air purging ring outer ring.
5. The semi-finished product thickness separation powder concentrator with the material blocking cone as claimed in claim 4, wherein: wind ring wind guide scattering plate gap wind speed V42-6 m/s; inclination angle theta of wind ring wind guide scattering plate220-60 degrees; the ratio S of the length of the horizontal projection of two adjacent overlapped scattering plates of the wind ring wind guide scattering plate to the length of the horizontal projection of a single scattering plate1:S2＝0.25～0.5。
6. The method of claim 4Semi-manufactured goods thickness separation selection powder machine with keep off material awl, its characterized in that: inner ring angle theta of purge air ring3＝(0.7±0.2)β。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121668264.6U CN216224797U (en) | 2021-07-20 | 2021-07-20 | Semi-finished product thickness separation selection powder machine with keep off material awl |
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| CN202121668264.6U CN216224797U (en) | 2021-07-20 | 2021-07-20 | Semi-finished product thickness separation selection powder machine with keep off material awl |
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2021
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