CN111451000A - Multi-energy-field-drive-based walnut shell micro-powder multi-particle-size-domain grading device and method - Google Patents
Multi-energy-field-drive-based walnut shell micro-powder multi-particle-size-domain grading device and method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/003—Pretreatment of the solids prior to electrostatic separation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/02—Separators
Abstract
The invention discloses a multi-energy field driving-based walnut shell micro powder multi-particle size domain grading device and method, which comprises the following steps: the powder conveying mechanism is used for conveying powder; the air compressor and the powder conveying mechanism are respectively connected with the gas-solid mixing mechanism, the output of the gas-solid mixing mechanism is connected with the grading mechanism, and the grading mechanism realizes grading of multiple particle size domains of the powder through the coanda effect. The invention adopts a feeding process of jet injection, realizes the same-cavity parallel rapid grading of the multi-grain runoff of the walnut shell micro powder, and reduces the secondary agglomeration probability of the walnut shell micro powder.
Description
Technical Field
The invention relates to the technical field of multi-particle size domain grading of walnut shell micro powder, in particular to a multi-particle size domain grading device and method of walnut shell micro powder based on multi-energy field driving.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Walnut shell particles with thick and hard walnut shell texture, 1.25-1.60mm particle size and 230N average compression limit; walnut shell particles with the particle size of 0.80-1.00mm, and the average compression limit is 165N. The walnut shell powder with the particle size of 100 mu m can be added into the automobile tire to produce a novel extremely wear-resistant tire which is harder than an ice layer, does not damage the road surface and does not generate dust pollution. As an abrasive with uniform particle size, good wear resistance, microporous surface and good adsorption effect, walnut shells are subjected to degreasing, crushing, screening (about 0.08-1.11mm) and other treatments, and can be applied to polishing and grinding of rare precious products such as pearl jewelry, buttons, electronic parts, stamping parts, high-grade furniture and the like.
Because the application fields of the walnut shell powder with different grain diameters are different, the realization of accurate grading of the walnut shell micro powder is very important for improving the utilization rate of the walnut shell powder. The walnut shell powder presents different properties from the original material after being ultrafined, the specific surface area is increased, and the walnut shell powder is easy to aggregate due to the action of external impurities such as water and surface grease; the walnut shell micro powder is also easy to gather on large particles due to collision absorption in the crushing process or due to the acting force of static electricity and the like after being crushed, and secondary particles with larger particle size are easy to generate in the air. This makes the classification of the walnut shell micropowder more difficult than that of the ordinary product.
There are two main types of classifiers, namely classifiers and screening machines, currently on the market. The screening machine is a simple method for separating particles with different sizes through a screen surface with a certain aperture, the particles with the particle size larger than the diameter of a screen hole are intercepted on the screen surface, and the particles with the particle size smaller than the diameter of the screen hole pass through the screen hole to become screen material. However, the screening performance is influenced by the particle shape and the screening time, and the walnut shell micro powder can block the screen holes in the actual screening process; generally, a sieving machine has a high efficiency of classifying particles having a particle size of 100 μm or more, but the effect of classifying ultrafine particles is not satisfactory. The cell diameter of the walnut shell is about 34 mu m, the grain diameter of the walnut shell micro powder with more than 500 meshes is about 10 mu m, and the grading effect of the screening on the walnut shell micro powder is very little; in addition, in the screening process of the walnut shell micro powder, the phenomenon of agglomeration aggravated by the interparticle forces such as attraction generated by friction and charge is inevitable, so that the screening process is not suitable for accurately grading the walnut shell micro powder. The classifier generates different motion tracks according to the action of centrifugal force, gravity and inertia force on particles with different particle sizes in fluid, and realizes fine classification with smaller particle sizes. The gravity classification is to classify by utilizing different sedimentation speeds of particles with different particle sizes in a gravity field, and has a horizontal flow type and a vertical flow type according to different flow reverse directions of the flow field. The gravity grading device has simple structure, small resistance and large feeding amount, can realize one-time multi-particle size grading, but has the grading particle size limited to 200-2000 mu m, and has low grading precision and efficiency. In the inertia force field classification, because the inertia of different particle size particles is different, different motion tracks are formed, the separation of thick and thin particles is realized, the classification of particles in multiple particle size domains can be realized at one time, the classification precision is high, the structure is simple, the maintenance is easy, but the interference factors of the flow field are more, and the control is difficult. The coarse particles in the centrifugal classifier are thrown out radially along the rotating cage by the centrifugal force greater than the air drag force, fall along the shell under the action of the gravity of the coarse particles and are collected, and the fine particles are sucked into the rotating cage by the air drag force greater than the centrifugal force and are taken out of the classifier along with the air flow. The centrifugal classifier can only classify products with two grain sizes, namely a coarse grain product and a fine grain product, and is suitable for fine classification.
The realization of the accurate classification of the walnut shell micro powder in multiple particle size domains is an effective way for solving the technical bottleneck, and the realization of the high-efficiency and high-quality classification of the walnut shell micro powder mainly faces two challenges: on one hand, due to different application fields of the particle sizes of the walnut micro powder, in order to realize the efficient utilization of the walnut micro powder, multiple particle size domains are required to be classified accurately, but the existing screening and classifying technology has the defects of high energy consumption, low efficiency and accuracy, too wide particle size distribution range after classification and the like, so that the walnut shell micro powder multiple particle size domain classifying process cannot be realized economically, efficiently and accurately; on the other hand, because the walnut shell powder presents different properties after being subjected to ultrafine grinding, the attraction among particles and the action of surface grease are easy to aggregate, and the phenomenon of multiple agglomeration is generated, so that the particle size distribution is uneven, and the efficient utilization of the walnut shell powder in various fields is not facilitated.
The prior art discloses a method for improving grading precision of powder particles and a particle classifier, wherein a hollow grading cavity is arranged in the particle classifier, so that fluid enters the grading cavity from the middle position of the grading cavity in the height direction along the tangential direction of the inner wall of the grading cavity; the position of the material entering the classifier is controlled by optimizing the fluid dynamic layout of the particle classifier according to the speed distribution characteristics of the particle classification flow field, so that the high-precision classification of the solid particles is realized.
The prior art discloses a double-cone spiral ultrafine particle classifier, which realizes two-stage classification of coarse and fine particles at a double-cone cavity and a threaded sleeve by generating strong centrifugal force through high-speed rotation of a main shaft, and finally realizes the purpose of ultrafine particle classification.
However, the above techniques do not consider the problems of drying and micro-agglomeration of powder.
Disclosure of Invention
In view of the above, the invention provides a multi-energy field driving-based walnut shell micro powder multi-particle size domain grading device and method, and the device can avoid multiple agglomeration phenomena generated during walnut shell powder grading and realize accurate grading of the walnut shell micro powder multi-particle size domain.
In some embodiments, the following technical scheme is adopted:
walnut shell miropowder many particle size territory grading plant based on multipotency field drive includes: the powder conveying mechanism is used for conveying powder; the air compressor and the powder conveying mechanism are respectively connected with the gas-solid mixing mechanism, the output of the gas-solid mixing mechanism is connected with the grading mechanism, and the grading mechanism realizes grading of multiple particle size domains of the powder through the coanda effect.
Specifically, the grading mechanism includes: the air conditioner comprises a grading box body, wherein a coanda block is arranged on one side wall of the grading box body, and a plate electrode and a windward air pipe are respectively arranged at the top of the grading box body; the bottom of the grading box body is provided with a plurality of grading chambers with different particle grades; the charged powder can enter different grading chambers according to particle sizes under the combined action of the adsorption force of the coanda block, the electric field force of the electrode plate and the windward force of the windward air pipe.
In other embodiments, the following technical solutions are adopted:
the walnut shell micro powder multi-particle size domain grading method based on the multi-energy field driving comprises the following steps:
the walnut shell powder is stirred and pre-crushed, is subjected to corona treatment under the action of airflow with set pressure, and then is sprayed into a grading mechanism;
the grading mechanism realizes grading of multiple particle size domains of the powder under the auxiliary action of electric field force and windward force through the coanda effect.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adopts a feeding process of jet injection, realizes the same-cavity parallel rapid grading of the multi-grain runoff of the walnut shell micro powder, and reduces the secondary agglomeration probability of the walnut shell micro powder;
2) based on the wall attachment principle, the grading efficiency and the grading precision of the walnut shell superfine powder are improved through the auxiliary adjustment of the electric field force and the windward force;
3) the method realizes the dynamic adjustable accurate classification of the multi-grain runoff of the walnut shell micro powder by adjusting main process parameters such as wind speed, windward airflow angle, electric field intensity, feeding speed and the like.
Drawings
FIG. 1 is a schematic structural diagram of a multi-particle size domain grading device of walnut shell micro powder based on multi-energy field driving in the embodiment of the invention;
FIG. 2 is a schematic view showing the structure of a pipe connecting portion according to an embodiment of the present invention;
FIGS. 3(a) - (b) are a top view and a cross-sectional view, respectively, of a gas-solid mixer in an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a hopper connected with a gas-solid mixer in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a powder valve according to an embodiment of the present invention;
FIG. 6 is a schematic view of a corona tube configuration in an embodiment of the invention;
figure 7 is an isometric view of a corona rod in an embodiment of the invention;
FIG. 8 is an isometric view of a powder delivery mechanism in an embodiment of the invention;
FIG. 9 is a top view of an auger hopper in an embodiment of the present invention;
FIG. 10 is a cross-sectional view of the auger and auger hopper connection in an embodiment of the present invention;
FIG. 11 is an isometric view of a helical conveying blade in an embodiment of the invention;
FIG. 12 is an isometric view of a mixing rotor in an embodiment of the invention;
FIG. 13 is a front view of a staging mechanism in an embodiment of the invention;
FIG. 14 is a rear view of a staging mechanism in an embodiment of the invention;
FIG. 15 is an isometric view of a grading mechanism in an embodiment of the invention;
FIG. 16 is a top view of the windward pipe in an embodiment of the invention;
FIG. 17 is a partial cross-sectional view of the windward tube in an embodiment of the invention;
FIG. 18 is an enlarged partial view of the windward pipe in the embodiment of the present invention;
FIGS. 19(a) - (b) are internal and cross-sectional views, respectively, of a staging mechanism in an embodiment of the invention;
FIG. 20 is a schematic diagram of the coanda effect;
FIG. 21 is a schematic view of a square outlet tube configuration;
the system comprises an air compressor, a pipeline part, a powder conveying mechanism and a grading mechanism, wherein the air compressor is I, the pipeline part is II, the powder conveying mechanism is III, and the grading mechanism is IV;
II-01, a first section of pipeline, II-02, a pressure regulating valve, II-03, a flow regulating valve, II-04, a second section of pipeline, II-05, a first screw, II-06, a sealing gasket, II-07, an air heater, II-08, a third section of pipeline, II-09, a hopper, II-10, a powder valve, II-11, a gas-solid mixer, II-12, a bolt, II-13, a fourth section of pipeline, II-14, a corona tube, II-15, a corona rod, II-16, a fifth section of pipeline, and II-17, a nozzle;
III-01, a speed reducer support, III-02, a second screw, III-03, a driving motor, III-04, a speed reducer, III-05, a connector, III-06, a stirring rotor shaft, III-07, a chain, III-08, a third screw, III-09, an auger hopper, III-10, an auger shell, III-11, a bearing cap nut, III-12, a bearing cap screw, III-13, a large chain wheel, III-14, a small chain wheel, III-15, an auger support, III-16, a stirring rotor, III-17, an external expanding hopper, III-18, a spiral conveying blade, III-19, a bearing cap and III-20, and a rotating shaft;
IV-01, a grading box body, IV-02, an auxiliary airflow nozzle, IV-03, a rotatable right-angle air pipe joint, IV-04, a square outlet pipe, IV-05, a fourth screw, IV-06, a servo motor, IV-07, an electrode plate, IV-08, a fourth nut, IV-09, a windward air pipe, IV-10, a Kangda block and IV-11, a grading chamber.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example one
In one or more embodiments, disclosed is a multi-energy field driving-based walnut shell micro powder multi-particle size domain classification device, comprising: the device comprises an air compressor I for generating air flow and a powder conveying mechanism III for conveying powder; the air compressor I and the powder conveying mechanism III are respectively connected with the gas-solid mixing mechanism, the output of the gas-solid mixing mechanism is connected with the grading mechanism, and the grading mechanism realizes grading of multiple particle size domains of powder through the coanda effect.
Specifically, referring to fig. 1, the walnut shell micro powder multi-particle size domain classification device based on multi-energy field driving specifically comprises: air compressor machine I, pipeline part II, powder conveying mechanism III, and grading mechanism IV.
The main function of the air compressor part is to provide air flow with certain pressure. The pipeline part is mainly used for mixing and drying the airflow and the powder, and the powder particles are charged with the same kind of charges to form a tiny repulsive force between the powder particles so as to prevent agglomeration. The air flow from the air compressor passes through a pressure regulating valve II-02, a flow regulating valve II-03, an air heater II-07, a gas-solid mixed gas and a corona tube II-14 and finally enters a grading mechanism through a nozzle II-17.
Referring to fig. 2, the pipe section II structure includes: a first section of pipeline II-01 connected from an air compressor is sequentially connected in series with a pressure regulating valve II-02 and a flow regulating valve II-03, and then is connected with an air heater II-07 through a flange of a second section of pipeline II-04 through a first screw II-05; a sealing gasket II-06 is arranged between the air heater II-07 and the second section of pipeline II-04, then the other end of the air heater II-07 is connected with the third section of pipeline II-08 through a flange and a sealing gasket is arranged between the air heater II-07 and the third section of pipeline II-08; then, the third section of pipeline II-08 is connected with the gas-solid mixer II-11 through a flange and a screw; the other end of the gas-solid mixer II-11 is connected with a fourth section pipeline II-13 through a flange by a bolt II-12, a sealing gasket is arranged between the gas-solid mixer II-11 and the fourth section pipeline II-13, the middle of the gas-solid mixer II-11 is connected with a powder valve II-10, and the powder valve II-10 is connected with a hopper II-09; the fourth section of pipeline II-13 is in screwed connection with the corona device through a flange, a sealing gasket is arranged between the fourth section of pipeline II-13 and the corona device, the other end of the corona device is in screwed connection with the fifth section of pipeline II-16, and a sealing gasket is arranged between the fourth section of pipeline II-13 and the fifth section of pipeline II-16; the other end of the fifth section of pipeline II-16 is connected with the nozzle II-17 through a quick joint.
The first section of pipeline II-01 is a bent pipe, the third section of pipeline II-08 and the fourth section of pipeline II-13 are flange pipes, and the fifth section of pipeline II-16 is an air pipe.
Referring to fig. 2-5, a middle pipe orifice of a gas-solid mixer II-11 is connected with a powder valve II-10, the powder valve II-10 is connected with a hopper II-09, the right end of the gas-solid mixer II-11 is connected with a corotron II-14 through a fourth section of pipeline II-13, a sealing gasket is arranged in the middle of the corotron II-14, the fifth section of pipeline II-16 is used for connecting the corotron II-14 with a nozzle II-17, the corotron II-14 is connected with the fifth section of pipeline II-16 through a flange, and the fifth section of pipeline II-16 is connected with the nozzle II-17 through a quick joint.
The structure of the corotron II-14 and the corotron II-15 is shown in figure 6 and figure 7, and four corotron II-15 are arranged on the corotron II-14 in a circle. The corona tube can carry the same charge on the powder particles through corona discharge, and the particles with the same charge repel each other to prevent the particles from agglomerating.
The structure of the gas-solid mixer refers to fig. 3(a) - (b), one end of the pneumatic mixer is connected with the gas inlet pipe, the gas flow passes through the accelerating pipeline, the gas flow is sprayed out from the port of the accelerating pipeline, negative pressure is generated around the accelerating pipeline, the middle part is the gas inlet pipe, powder enters from the gas inlet pipe, and enters the decelerating pipeline at the upper end under the driving of the gas flow.
The principle of the gas-solid mixer is as follows: the high-speed air ejected from the contraction section or nozzle is used to generate a pressure equal to or slightly lower than the atmospheric pressure at the throat part, so that the powder and the granular material fall into or are sucked into the feeder due to gravity, the speed of the high-speed air can accelerate the powder and the granular material, and the high-speed air is converted into pressure energy required by conveying in the diffusion pipe to pneumatically convey the material.
Wherein, PpIs the nozzle inlet pressure; ptIs the nozzle throat pressure; u. oftIs the nozzle exit velocity; r is a gas constant; t isPIs the inlet temperature; gamma is a gas constant.
Determining the throat diameter of a convergent nozzle according to the inlet and outlet pressure and the air flow:
wherein d istIs the diameter of the throat of the nozzle; m is gas mass flow; rhopIs the inlet gas density.
Wherein A is3Is the cross-sectional area of the mixing chamber; a. thetIs the nozzle throat area; II typep＊ is critical expansion ratio of nozzle, PcBack pressure is applied to the conveying pipeline; pHIs the nozzle outlet pressure; lambda [ alpha ]PThe isentropic velocity is converted for the nozzle,
in order to be the speed factor,
obtaining a nozzle distance equation according to a Sokoloff theory;
L＝L1+L2
wherein, L1Length of free stream L2Is the length of the mixing chamber inlet section.
The ratio of the length of the mixing chamber to the inner diameter can obtain higher material-gas ratio when the ratio is 6-10, and the inner diameter of the mixing chamber is determined according to the optimal area ratio.
Lk＝(6～10)dz
Wherein, LkIs the mixing chamber length; dzIs the mixing chamber diameter.
The angle of the diffusion chamber is generally 6-8 degrees, the length is selected according to the diameter of the outlet, and the diameter of the outlet is generally the diameter of the conveying pipeline.
LD＝(7～9.5)(dc-dz)
Wherein, LDIs the diffusion chamber length; dcIs the diffusion chamber exit diameter.
Referring to fig. 8, the powder conveying mechanism III consists of an auger conveying part and a stirring part, wherein the auger conveying part comprises an auger, and a rotating shaft III-20 connected with a spiral conveying blade III-18 is arranged in the auger; the stirring part comprises an auger hopper III-09 connected with an auger, the auger hopper III-09 is connected with an outer expanding hopper III-17, and a plurality of stirring rotors III-16 are arranged in the auger hopper III-09; the stirring rotors III-16 are all connected to the stirring rotor shaft III-06; the rotating shaft III-20 is connected with the stirring rotor shaft III-06 through a transmission mechanism; the rotating shaft III-20 is driven to rotate by a driving device, and then the stirring rotor III-16 is driven to rotate. The powder enters a conveyer, the powder is pre-crushed by a stirring part, and then enters a packing auger for stirring, and the conveying of the material is completed by loosening. The walnut shell powder enters a feeding hopper of the gas-solid mixer through the powder conveying mechanism.
Specifically, the powder conveying mechanism includes: the speed reducer support III-01 is used for supporting the speed reducer III-04, and the packing auger support III-15 is used for supporting the packing auger; the speed reducer III-04 is connected with a speed reducer bracket III-01 through a second screw III-02; the packing auger comprises a packing auger shell III-10, the packing auger shell III-10 is connected with a packing auger support III-15 through a third screw III-08, and the end part of the packing auger shell III-10 is connected with a bearing cover III-19 through a bearing cover screw III-12 and a bearing cover nut III-11; a rotating shaft III-20 connected with a spiral conveying blade III-18 is arranged in the auger shell III-10, the structure of the rotating shaft III-20 with the spiral conveying blade III-18 is shown in figure 11, and the rotating shaft III-20 extends out from one end of the auger shell III-10 and is connected with a speed reducer III-04 through a connector III-05; the outlet at the other end of the auger shell III-10 corresponds to the hopper II-09, so that the powder output from the auger shell III-10 enters the hopper II-09.
Referring to fig. 9-10, the auger housing III-10 is communicated with the auger hopper III-09, a stirring rotor III-16 is arranged in the auger hopper III-09, and the structure of the stirring rotor III-16 is shown in fig. 12.
The driving motor III-03 is arranged on the speed reducer support III-01, the driving motor III-03 is connected with the speed reducer III-04, the speed reducer III-04 is connected with a rotating shaft III-20 in the packing auger through a connector III-05, a small chain wheel III-14 is arranged on the rotating shaft III-20, a large chain wheel III-13 is arranged on the stirring rotor shaft III-06, and the small chain wheel III-14 and the large chain wheel III-13 are connected through a chain III-07.
The driving motor III-03 drives the speed reducer III-04 to drive the rotating shaft III-20 to rotate, and the rotating shaft III-20 drives the stirring rotor III-16 to rotate through the transmission of the chain III-07, so that the purposes of stirring and conveying are achieved.
The conveying capacity of the packing auger is as follows:
Q＝47D2SNψ；
wherein Q is a conveying amount (t/h); s is the pitch, D is the diameter (m) of the helical blade, N is the rotational speed (gamma/min) of the helical shaft, and psi is the filling factor.
Referring to fig. 13-15, the staging mechanism IV includes: a grading box body IV-01, wherein a coanda block IV-10 is arranged on one side wall of the grading box body IV-01, and the top of the grading box body IV-01 is respectively provided with a plate electrode IV-07 and a windward air pipe IV-09; the bottom of the grading box body IV-01 is provided with a plurality of grading chambers IV-11 with different particle grades; the charged powder can enter different grading chambers IV-11 according to the particle size under the combined action of the adsorption force of the coanda block IV-10, the electric field force of the electrode plate IV-07 and the windward force of the windward air pipe IV-09.
Wherein, the wall of the Kangda block IV-10 contacting with the powder particles is a curved wall. When the powder particles are ejected from the nozzle along with the airflow, if the particle size of the powder particles is smaller, the wall attachment effect of the powder particles along with the airflow is better, and the powder particles are easy to move along the curved wall along with the airflow; if the particle size of the powder particles is larger, the powder particles have poorer wall attachment effect along with the airflow, are easy to fly out under the action of inertia and move away from the curved wall of the coanda block. And the air flow pressure is close to the wall surface of the coanda block.
Referring to fig. 16-19 (a) - (b), one end of the windward air pipe IV-09 is connected with the servo motor IV-06 by a key so as to finely adjust the angle of the windward air pipe, and the other end thereof is provided with an air inlet connected with an external air inlet pipe by a rotary joint IV-03 so as to allow air flow to enter the windward air pipe IV-09. As shown in fig. 16 and 18, the windward air pipe is hollow, one side of the windward air pipe is provided with an air outlet, one end of the windward air pipe is connected with the servo motor in a key mode, and the other end of the windward air pipe is connected with the rotatable air inlet joint. The servo motor IV-06 and the grading box body IV-01 are fixed in a matching mode of a fourth screw IV-05 and a fourth nut IV-08.
Wherein, the powder enters a grading box IV-01, and different particles carried in jet flow can generate different deflection tracks due to different inertia force and windward resistance by utilizing the coanda effect of the coanda block IV-10, thereby leading the separation of the walnut shell superfine powder. The static electricity of different particles is different, and under the uniform electric field generated by the electrode plate IV-07, the electric field force can have a downward electric field force on the particles to assist the separation of the particles. The windward air pipe generates windward force to assist the separation of the walnut shell powder, and the servo motor IV-06 controls the windward air pipe to rotate so as to provide windward force at different angles.
The auxiliary nozzle IV-02 is arranged right above the gas-solid outlet of the coanda block, and the auxiliary nozzle can help the powder particles to attach to the wall through the sprayed gas flow and prevent the micro particles from moving upwards.
Under the action of the coanda effect, fine particles are tightly attached to the coanda block IV-10 under the combined action of the electric field force and the windward force, medium particles are in the middle, and large particles are far away from the coanda block IV-10. Thus, the fine powder particles are instantaneously divided into fine, medium and coarse stages, and then recovered in the downstream classification chamber IV-11.
As shown in fig. 19(b), the grading chamber is arranged at the bottom end of the grading box body and is divided by triangular bodies, and the grading chamber is arranged between the two triangular bodies.
Specifically, powder particles enter a classification box body IV-01 under the driving of airflow, a wall attachment effect occurs through a coanda block IV-10, due to the inertia of the particles and a curved surface wall, the particles are separated according to the wall attachment effect because the particle sizes and the masses are different, a uniform electric field generated by an electrode plate I-07 has a downward repulsive force on charged particles due to particle charges, the repulsive force can further assist the particles to enter different classification chambers IV-11, and the windward force generated by a windward air pipe IV-09 assists the fine particles on large particles to be separated, so that the separation efficiency is improved. The particles with different particle diameters enter different grading chambers after being separated, then flow out and are packed through a square outlet pipe IV-04, the middle of the square outlet pipe IV-04 is hollow as a cuboid in the figure 21, and the top of the square outlet pipe IV-04 is arranged at the bottom end of the grading box body through a sliding chute.
Referring to fig. 20, the principle of the coanda effect is illustrated as follows:
kangda block near-wall pressure PsThe expression is as follows:
the separation angle α of the jet along the coanda block wall is expressed as:
in the formula: p is the nozzle outlet pressure, Pa; p∞The far wall pressure of the Kangda block is Pa; pSThe near-wall pressure of the Kangda block is Pa; y ismThe radial direction of the position of the maximum air flow speed on the radial section of the wall surface of the coanda block from the surface of the coanda blockDistance, mm, width of nozzle outlet, mm, R is curvature radius of coanda block, mm, α is separation angle of air flow along coanda block wall surface, degree.
Coupling of force:
F1＝Fe+FycosO+mg
F2＝Fp-FysinO
F1for downward force, F2For a rightward force, FpIs the aerodynamic force to which the particles are subjected, FeIs the force of an electric field, FyAnd O is an included angle between the air inlet pipe and the vertical direction. The included angle can be adjusted by driving the electrodes to adjust the angle of the windward airflow.
Example two
In one or more embodiments, disclosed is a multi-particle size domain classification method of walnut shell micropowder based on multi-energy field driving, comprising:
the walnut shell powder is stirred and pre-crushed, is subjected to corona treatment under the action of airflow with set pressure, and then is sprayed into a grading mechanism;
the grading mechanism realizes grading of multiple particle size domains of the powder under the auxiliary action of electric field force and windward force through the coanda effect.
Specifically, after the walnut shell powder is stirred through powder conveying mechanism, the walnut shell powder is conveyed to a gas-solid mixer through a packing auger, an air flow with set pressure is generated through an air compressor, the walnut shell powder is conveyed through the air flow, and in the conveying process, corona treatment is carried out through a corona device so as to increase the adhesiveness of the powder.
Under the drive of airflow, the powder is sprayed into a grading mechanism, and a coanda block of the grading mechanism generates a coanda effect to grade the walnut shell powder according to the particle size; meanwhile, the grading efficiency is improved under the assistance of the electric field force and the windward force.
By adjusting the wind speed, the windward airflow angle, the electric field intensity and the feeding speed parameters, the size of the multi-grain runoff of the walnut shell micro powder can be dynamically adjusted, so that the classification efficiency of the walnut shell micro powder is improved.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. Walnut shell miropowder many particle size territory grading plant based on multipotency field drive, its characterized in that includes: the powder conveying mechanism is used for conveying powder; the air compressor and the powder conveying mechanism are respectively connected with the gas-solid mixing mechanism, the output of the gas-solid mixing mechanism is connected with the grading mechanism, and the grading mechanism realizes grading of multiple particle size domains of the powder through the coanda effect.
2. The multi-energy field drive-based walnut shell micropowder multi-particle size domain grading device of claim 1, wherein the grading mechanism comprises: the air conditioner comprises a grading box body, wherein a coanda block is arranged on one side wall of the grading box body, and a plate electrode and a windward air pipe are respectively arranged at the top of the grading box body; the bottom of the grading box body is provided with a plurality of grading chambers with different particle grades; the charged powder can enter different grading chambers according to particle sizes under the combined action of the adsorption force of the coanda block, the electric field force of the electrode plate and the windward force of the windward air pipe.
3. The multi-energy field drive-based walnut shell micropowder multi-particle size domain classification device of claim 2 wherein the wall of the coanda block in contact with the powder particles is a curved wall.
4. The walnut shell micro powder multi-particle size domain grading device based on the multi-energy field driving of claim 2, wherein one end of the windward air pipe is connected with a servo motor, and the windward air pipe is driven by the servo motor to adjust the angle of windward air flow; the other end is connected with an external air pipe through a rotatable right-angle air pipe joint so as to enable air flow to enter a windward air pipe.
5. The walnut shell micro powder multi-particle size domain grading device based on the multi-energy field driving of claim 1, wherein the air compressor and the gas-solid mixing mechanism are connected through a pipeline, and a pressure regulating valve, a flow regulating valve and an air heater are sequentially connected in series on the pipeline.
6. The multi-energy field drive-based walnut shell micro powder multi-particle size domain grading device of claim 1, wherein the gas-solid mixing mechanism comprises: the gas-solid mixer is provided with a powder valve, the powder valve is connected with a hopper, and the hopper is used for receiving powder output by the powder conveying mechanism.
7. The walnut shell micro powder multi-particle size domain grading device based on multi-energy field driving of claim 1, wherein the output end of the gas-solid mixing mechanism is connected with a corona tube through a pipeline, the corona tube is connected with a nozzle through a pipeline, and the nozzle is connected with the grading mechanism.
8. The multi-energy-field-drive-based walnut shell micro-powder multi-particle-size-domain grading device as claimed in claim 1, wherein the powder conveying mechanism comprises: a stirring part and a packing auger conveying part;
the auger conveying part comprises an auger, and a rotating shaft connected with a spiral conveying blade is arranged in the auger;
the stirring part comprises an auger hopper connected with the auger, and a stirring rotor is arranged in the auger hopper;
the rotating shaft is connected with the stirring rotor through a transmission mechanism; the rotating shaft is driven to rotate through the driving device, and then the stirring rotor is driven to rotate.
9. The walnut shell micro powder multi-particle size domain grading method based on multi-energy field driving is characterized by comprising the following steps:
the walnut shell powder is stirred and pre-crushed, is subjected to corona treatment under the action of airflow with set pressure, and then is sprayed into a grading mechanism;
the grading mechanism realizes grading of multiple particle size domains of the powder under the auxiliary action of electric field force and windward force through the coanda effect.
10. The multi-energy-field-drive-based walnut shell micro powder multi-particle size domain grading method of claim 9, wherein the size of the multi-particle flow of the walnut shell micro powder can be dynamically adjusted by adjusting the wind speed, the wind-facing airflow angle, the electric field intensity and the feeding speed parameters, so as to improve the grading efficiency of the walnut shell micro powder.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010287094.0A CN111451000B (en) | 2020-04-13 | 2020-04-13 | Walnut shell micropowder multi-particle-size domain grading device and method based on multi-energy field driving |
| PCT/CN2020/089406 WO2021208167A1 (en) | 2020-04-13 | 2020-05-09 | Multi-energy field drive-based multi-particle size range classification device and method for walnut shell micropowder |
| ZA2021/07008A ZA202107008B (en) | 2020-04-13 | 2021-09-20 | Multi-particle size domain classification device and method of walnut shell micro-powder based on multi-energy field driving |
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| CN202010287094.0A CN111451000B (en) | 2020-04-13 | 2020-04-13 | Walnut shell micropowder multi-particle-size domain grading device and method based on multi-energy field driving |
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| CN113956051A (en) * | 2021-11-26 | 2022-01-21 | 厦门钜瓷科技有限公司 | Decarbonization method for preparing aluminum nitride powder by carbothermic method |
| CN117657783A (en) * | 2024-01-31 | 2024-03-08 | 安徽省农业科学院农业工程研究所 | Intelligent grading negative pressure conveying device and method for apocarya raw materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114408583B (en) * | 2022-02-23 | 2024-04-26 | 杭州日至盛净化设备有限公司 | Storm type adsorbent feeder |
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| CN117657783A (en) * | 2024-01-31 | 2024-03-08 | 安徽省农业科学院农业工程研究所 | Intelligent grading negative pressure conveying device and method for apocarya raw materials |
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| ZA202107008B (en) | 2022-05-25 |
| WO2021208167A1 (en) | 2021-10-21 |
| CN111451000B (en) | 2023-07-04 |
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