CN112892446B - Powder surface modification device and method - Google Patents
Powder surface modification device and method Download PDFInfo
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- CN112892446B CN112892446B CN202110062152.4A CN202110062152A CN112892446B CN 112892446 B CN112892446 B CN 112892446B CN 202110062152 A CN202110062152 A CN 202110062152A CN 112892446 B CN112892446 B CN 112892446B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
- B01J19/0066—Stirrers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1809—Controlling processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/1818—Feeding of the fluidising gas
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Abstract
The invention discloses a powder surface modifying device, which comprises a charging barrel formed by a barrel body, a barrel bottom and a barrel top, and a stirrer arranged in the charging barrel, wherein the barrel top is provided with an air outlet for exhausting air, the barrel bottom is provided with an air inlet, an air permeable plate is arranged in the air inlet, the air permeable plate allows air to enter the charging barrel but does not allow powder to flow out of the charging barrel, the air inlet is communicated with a wind source and is used for guiding air into the charging barrel, and the stirrer comprises a first group of blades arranged in the bottom of the charging barrel and a second group of blades arranged in the top of the charging barrel. The invention also provides a method for modifying the powder surface by using the device. The powder surface modification device and method have the advantages of uniform modification temperature, rapid temperature rise and fall, small powder crushing rate, high modified powder yield, low comprehensive energy consumption, less equipment abrasion, no particle adhesion on the inner wall of the equipment and the like.
Description
Technical Field
The invention relates to the technical field of powder surface modification, in particular to a powder surface modification device and a method for modifying the surface of powder by using the powder surface modification device.
Background
To accommodate various applications, surface modification is widely applied to various powders, such as inorganic, organic, metallic, and the like. Among various surface modification methods, dry modification is one of the most commonly used methods, and mainly includes adding a surface modifier into dry powder, and coating the powder under specific device and process conditions to obtain modified powder. Examples of common powder surface modifying devices include: SLG type continuous powder surface modifying machine, high-speed heating mixer, high-speed impact type powder surface modifying machine, PSC type powder surface modifying machine, horizontal blade mixer, fluidized bed type modifying machine, etc. In the practical use process of the devices, the powder is not easy to be quickly and uniformly heated and cooled by adopting a mechanical stirring device, and the powder surface modifying device for fluidizing the powder by adopting gas can control the temperature of the powder by changing the temperature of the gas. The common fluidization device needs a large amount of gas to realize fluidization and full mixing of powder, the energy consumption is increased due to the large amount of gas, and the micro powder entrained in the gas also needs subsequent treatments such as dust removal and the like; in addition, the device is more easy to cause mutual adhesion of powder under the action of the modifier and adhere to the inner wall of the device.
Accordingly, there remains a need for further improvements over existing powder surface modifying devices.
Disclosure of Invention
The invention aims to provide a powder surface modification device which solves the problems in the prior art. Therefore, the invention provides the following technical scheme:
the utility model provides a powder surface modifying device, include the feed cylinder that comprises barrel, barrel bottom and barrel top, and set up the agitator in the feed cylinder, wherein the barrel top is equipped with the gas outlet that is used for the exhaust gas, the barrel bottom is equipped with the air inlet, be equipped with the ventilative board in the air inlet, the ventilative board allows gas to get into the feed cylinder and does not allow powder to flow out the feed cylinder, the air inlet communicates with the wind regime and is used for leading into the feed cylinder with the air inlet, the agitator includes the first group paddle of locating in the feed cylinder bottom and locates the second group paddle in the feed cylinder top, wherein first group paddle includes the first paddle that can scrape the powder of sweeping barrel bottom internal surface and barrel lower part internal surface department and can throw the powder on, the second group paddle includes the third paddle that can scrape the powder of sweeping barrel top internal surface and barrel upper portion internal surface department and can throw the powder down fourth paddle.
Further, the first blade comprises a first blade section and a second blade section which are respectively in a flat plate shape, one end of the first blade section is fixedly connected to the lower part of the blade shaft, the other end of the first blade section extends along the direction perpendicular to the axis of the blade shaft until being connected with one end of the second blade section, and the other end of the second blade section extends upwards along the direction parallel to the axis of the blade shaft; the third blade comprises a sixth blade section and a seventh blade section which are respectively in a flat plate shape, one end of the sixth blade section is fixedly connected to the upper part of the blade shaft, the other end of the sixth blade section extends along the direction vertical to the axis of the blade shaft until being connected with one end of the seventh blade section, and the other end of the seventh blade section extends downwards along the direction parallel to the axis of the blade shaft.
Further, the second blade comprises a third blade section, a fourth blade section and a fifth blade section which are respectively in a flat plate shape, one end of the third blade section is fixedly connected to the lower part of the blade shaft, the other end of the third blade section extends along the direction perpendicular to the axis of the blade shaft until being connected with one end of the fourth blade section, the other end of the fourth blade section extends upwards along the direction forming a first angle with the axis of the blade shaft until being connected with one end of the fifth blade section, and the other end of the fifth blade section extends upwards and backwards along the direction forming a second angle with the axis of the blade shaft, forming a third angle with the axis plane of the blade shaft passing through the third blade section and the fourth blade section and opposite to the rotation direction of the stirrer; the fourth paddle comprises an eighth paddle section, a ninth paddle section and a tenth paddle section which are respectively in a flat plate shape, one end of the eighth paddle section is fixedly connected to the upper part of the paddle shaft, the other end of the eighth paddle section extends along the direction perpendicular to the axis of the paddle shaft until being connected with one end of the ninth paddle section, the other end of the ninth paddle section extends downwards along the direction forming a fourth angle with the axis of the paddle shaft until being connected with one end of the tenth paddle section, and the other end of the tenth paddle section extends backwards and downwards along the direction forming a fifth angle with the axis of the paddle shaft, forming a sixth angle with the axis plane of the paddle shaft passing through the eighth paddle section and the ninth paddle section and opposite to the rotation direction of the stirrer.
Further, the included angle between the plane of the first paddle section and the axis of the paddle shaft is 10-80 degrees, so that the upper surface of the first paddle section faces the rotating direction when the stirrer rotates so as to throw powder upwards, and the distance between the surface of the first paddle section facing the cylinder bottom and the upper surface of the cylinder bottom is 1-10 millimeters so as to scrape the powder attached to the cylinder bottom; the distance between the surface of the second paddle section facing the cylinder body and the inner surface of the cylinder body is 1-10 mm so as to scrape powder adhered to the inner wall of the cylinder body; the included angle between the plane of the sixth paddle section and the axis of the paddle shaft is 10-80 degrees, so that the lower surface of the sixth paddle section faces the rotating direction when the stirrer rotates so as to throw the powder downwards, and the distance between the surface of the sixth paddle section facing the cylinder top and the lower surface of the cylinder top is 1-10 millimeters so as to scrape the powder attached to the cylinder top 32; the seventh paddle section has a spacing of 1-10 mm between the face facing the barrel and the inner surface of the barrel to sweep powder adhering to the inner wall of the barrel 30.
Further, a first grinding groove is formed in the surface, facing the cylinder bottom, of the first paddle section, and a first included angle is formed between the length direction of the first grinding groove and the axial plane of the paddle shaft, which passes through the first paddle section; the surface of the second paddle section facing the cylinder body is provided with a second grinding groove, and the length direction of the second grinding groove forms a second included angle with the radial plane of the paddle shaft passing through the first paddle section; a fourth grinding groove is further formed in the surface, facing the top of the cylinder, of the sixth paddle section, and the length direction of the fourth grinding groove forms a fourth included angle with the axial plane of the paddle shaft, which passes through the sixth paddle section; the surface of the seventh paddle section facing the cylinder body is also provided with a fifth grinding groove, and the length direction of the fifth grinding groove and the radial plane of the paddle shaft passing through the sixth paddle section form a fifth included angle.
Further, a third grinding groove is further formed in the surface, facing the bottom of the barrel, of the third paddle section, and the length direction of the third grinding groove forms a third included angle with the axial plane of the paddle shaft, which passes through the third paddle section; and a sixth grinding groove is further formed in the surface, facing the top of the cylinder, of the eighth paddle section, and the length direction of the sixth grinding groove forms a sixth included angle with the axial plane of the paddle shaft, which passes through the eighth paddle section.
Further, the stirrer further comprises a third group of paddles arranged in the middle of the charging barrel, wherein the third group of paddles is fixed in the middle of the paddle shaft and comprises a fifth paddle capable of throwing powder to the upper part of the charging barrel.
The powder surface modification device and method have the following technical effects: the crushing of powder particles can be reduced under the condition that the powder and the modifier are fully mixed under the combined action of light fluidization and mechanical stirring, the stirring intensity required by uniform mixing can be reduced by fluidization, so that stirring energy consumption and equipment abrasion are reduced, the rapid, uniform and accurate temperature control of the powder can be realized by controlling the air inlet temperature, the full mixing of the powder and the modifier can be realized under the condition of reducing the air inlet quantity, the dust discharge is reduced, so that the dust removal burden is reduced, and the energy consumption required by controlling the air inlet temperature can be reduced by reducing the air inlet quantity; in addition, by using the stirrer provided by the invention, particles positioned (especially adhered to) the inner wall of the charging barrel can be scraped and milled, so that the particles are separated from the wall surface and are broken into powder particles, and even powder particle agglomerates in powder in the charging barrel can be milled and broken into powder particles, so that the burden of sieving out the agglomerates after modification can be reduced, and the yield of the surface modified powder can be improved.
Drawings
FIG. 1 is a schematic cross-sectional view showing the whole structure of a powder surface modifying apparatus of the present invention;
FIG. 2 is a schematic top view of the powder surface modifying apparatus of the present invention shown in FIG. 1;
FIG. 3 is a schematic structural view of a stirrer of the powder surface modifying apparatus of the present invention;
FIG. 4 is a schematic front view showing the structure of a stirrer of the powder surface-modifying apparatus of the present invention shown in FIG. 3;
fig. 5 is a schematic bottom view of the agitator of the powder surface modifying apparatus of the present invention shown in fig. 3.
In the figure: 1-a base; 2-an electric motor; 30-a cylinder; 31-barrel bottom; 311-air inlet; 312-ventilation board; 313-a gas storage bin; 314-an air pipe; 32-a cartridge top; 321-powder feed inlet; 322-modifier feed inlet; 323-air outlet; 33, a discharge hole; 34-a first temperature measuring port; 35-a second temperature measuring port; 36-a third temperature measuring port; 41-paddle shaft; 411-barrel bottom bearings; 412-a cartridge top bearing; 42-a first set of paddles; 421-first paddle section; 422-a second paddle section; 423-a third paddle section; 424-fourth paddle section; 425-a fifth paddle section; 426-first grinding groove; 427-second grinding groove; 428-third grinding groove; 43-a second set of paddles; 431-sixth paddle section; 432-seventh paddle section; 433-eighth paddle section; 434-a ninth paddle section; 435-tenth paddle section; 436-fourth grinding groove; 437-fifth grinding groove; 438-sixth grinding groove; 44-a third set of paddles; 441-fifth blade.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, an embodiment of the present invention provides a powder surface modifying apparatus, which includes a motor 2 mounted on a base 1, a barrel formed by a barrel 30, a barrel bottom 31 and a barrel top 32, and a stirrer disposed in the barrel, wherein the barrel 30 is cylindrical, the barrel top 32 and the barrel bottom 31 are disposed at upper and lower ends of the barrel 30, the barrel top 32 is provided with a powder feeding port 321, a modifier feeding port 322 and an air outlet 323, the barrel bottom 31 is provided with an air inlet 311, an air permeable plate 312 is disposed in the air inlet 311, the air inlet 311 is communicated with a wind source (not shown) through an air storage 313 and an air pipe 314, and a discharging port 33, a first temperature measuring port 34, a second temperature measuring port 35 and a third temperature measuring port 36 are also disposed on a side wall of the barrel 30; the paddle shaft 41 of the agitator is rotatably connected to the charging barrel through a barrel top bearing 412 provided on the barrel top 32 and a barrel bottom bearing 411 provided on the barrel bottom 31, respectively (the agitator can be more stable by providing the upper and lower bearings in this way, the accident that the agitator touches the charging barrel due to shaking can not occur), and the lower end of the paddle shaft 41 extends out of the barrel bottom 31 and is in driving connection with the driving shaft of the motor 2 so that the motor 2 drives the paddle shaft 41 to rotate.
In some cases, the wind source also includes heating devices, cooling devices, temperature control units, wind pressure control units, etc. to provide different temperatures, pressures, and volumes of intake air as desired. In some cases, the gas as the intake air may be air, nitrogen, an oxidizing gas, a reducing gas, an inert gas, or the like. In some cases, the gas as the inlet air may contain a modifier for modifying the powder. The temperature of the air inlet, the pressure and the air quantity can be correspondingly controlled by measuring the temperatures of different positions in the charging barrel through the thermometers of the first temperature measuring port 34, the second temperature measuring port 35 and the third temperature measuring port 36.
In some cases, the gas-permeable plate 312 provided in the gas inlet 311 allows only the intake air to enter the cartridge, and does not allow the powder to pass through the gas-permeable plate 312; preferably, the gas permeable plate 312 may be a porous plate, such as a porous plate formed by sintering powder metal or plastic, with a pore size of typically 0.1 to 5 microns, preferably 0.2 to 4 microns, 0.3 to 3 microns, 0.4 to 2 microns, 0.5 to 1 micron, etc. In some cases, there may be a plurality of air inlets 311, for example, 2, 4, 6, 8, 10, 12, 16, and these air inlets 311 may be uniformly distributed on the drum bottom 31, for example, arranged on the drum bottom 31 in a ring shape or a concentric ring shape; the respective gas storage tanks 313 of the intake ports 311 may communicate with each other so as to provide the same air pressure at the respective intake ports 311. In some cases, the gas storage compartment 313 may be an annular channel provided on the underside of the cartridge bottom 31.
In some cases, a gas permeable plate is also provided in the gas outlet 323, which allows gas to pass but not powder; preferably, the gas permeable plate may be a porous plate, such as a porous plate formed by sintering powder metal or plastic, having a pore size of typically 0.1 to 5 microns, preferably 0.2 to 4 microns, 0.3 to 3 microns, 0.4 to 2 microns, 0.5 to 1 micron, etc. In some cases, there may be a plurality, e.g., 2, 4, 6, 8, 10, 12, 16, of air outlets 323, and these air outlets 323 may be uniformly distributed on the cartridge top 32, e.g., annularly or concentrically disposed on the cartridge top 32. In some cases, a dust removing device is further disposed downstream of the air outlet 323 to remove dust in the exhaust gas, so as to avoid environmental pollution. In some cases, a heat energy recovery device (e.g., a heat exchanger) is also provided downstream of the air outlet 323 to recover heat energy in the exhaust gas, reducing the overall device energy consumption.
In some cases, plugging devices are provided at the powder inlet 321, modifier inlet 322, and outlet 33 to avoid powder flowing out of the cartridge when no charging or discharging operations are performed; preferably, the plugging device may be a plug or a shut-off valve; preferably, when the plug or shut-off valve plugs the powder feed port 321, modifier feed port 322, or discharge port 33, the face of the plug or shut-off valve facing the interior of the cartridge is substantially flush with the inner wall of the cartridge around it, so as to avoid powder volume accumulation.
In some cases, a negative pressure device is connected downstream of the outlet 33 to withdraw powder from the cartridge.
Referring to fig. 1-5, in some cases, the agitator further includes a first set of paddles 42 disposed in the bottom of the barrel, a second set of paddles 43 disposed in the top of the barrel, and a third set of paddles 44 disposed in the middle of the barrel, wherein the first set of paddles 42 are fixed to the lower portion of the paddle shaft 41 and include a first paddle capable of scraping powder at the inner surface of the bottom 31 and the lower inner surface of the barrel 30 and a second paddle capable of throwing powder toward the upper and middle of the barrel, the second set of paddles 43 are fixed to the upper portion of the paddle shaft 41 and include a third paddle capable of scraping powder at the inner surface of the top 32 and the upper inner surface of the barrel 30 and a fourth paddle capable of throwing powder toward the lower and middle of the barrel, and the third set of paddles 44 are fixed to the middle of the paddle shaft 41 and include a fifth paddle 441 capable of throwing powder toward the upper portion of the barrel.
In some cases, in the first set of blades 42, the first blade and the second blade are disposed opposite each other on both sides of the shaft 41. Preferably, the first set of blades 42 includes 1, 2, 3, 4 or 5 pairs of first and second blades disposed opposite each other on either side of the shaft 41. In some cases, in the second set of blades 43, a third blade and a fourth blade are disposed opposite each other on either side of the shaft 41. Preferably, the second set of blades 43 includes 1, 2, 3, 4 or 5 pairs of third and fourth blades disposed opposite each other on either side of the shaft 41. In some cases, the third set of blades 44 includes 2, 3, 4, 5, 6, 7, 8, 9, or 10 fifth blades uniformly disposed about the periphery of the shaft 41.
In some cases, the first blade includes a first blade section 421 and a second blade section 422 each having a flat plate shape, one end of the first blade section 421 is fixedly connected to a lower portion of the shaft 41 and the other end extends in a direction perpendicular to the axis of the shaft 41 until being connected to one end of the second blade section 422, and the other end of the second blade section 422 extends upward in a direction parallel to the axis of the shaft 41; the angle between the plane of the first blade section 421 and the axis of the shaft 41 is 10 to 80 degrees, such as 20 to 70 degrees, 30 to 60 degrees, 40 to 50 degrees, etc., preferably about 60 degrees, so that the upper surface of the first blade section 421 faces the rotation direction when the agitator rotates to throw the powder upward, and the interval between the surface of the first blade section 421 facing the bottom 31 and the upper surface of the bottom 31 is 1 to 10 mm, such as 1 to 5 mm, 1 to 4 mm, 1 to 3 mm, 1 to 2 mm, etc., so as to scrape the powder adhering to the bottom 31; the second paddle section 422 has a spacing between the face facing the barrel 30 and the inner surface of the barrel 30 of 1-10 mm, e.g., 1-5 mm, 1-4 mm, 1-3 mm, 1-2 mm, etc., to sweep powder adhering to the inner wall of the barrel 30. In some cases, first blade 421 is further provided with a first grinding groove 426 on a face thereof facing bottom 31, where first grinding groove 426 may have a width of 1-10 mm (e.g., 2-9 mm, 3-8 mm, 4-6 mm, about 5 mm, etc.), and first grinding groove 426 may have a depth of 1-10 mm (e.g., 2-9 mm, 3-8 mm, 4-6 mm, about 5 mm, etc.), and a length of first grinding groove 426 makes a first angle x (first angle x may be 15-75 degrees, e.g., 20-70 degrees, 30-60 degrees, 40-50 degrees, about 45 degrees, etc.) with an axial plane of paddle shaft 41 passing through first blade 421; the second blade section 422 is further provided with a second grinding groove 427 on a surface facing the barrel 30, the width of the second grinding groove 427 may be 1-10 mm (e.g., 2-9 mm, 3-8 mm, 4-6 mm, about 5 mm, etc.), the depth of the second grinding groove 427 may be 1-10 mm (e.g., 2-9 mm, 3-8 mm, 4-6 mm, about 5 mm, etc.), the length direction of the second grinding groove 427 makes a second angle y (the second angle y may be 15-75 degrees, e.g., 20-70 degrees, 30-60 degrees, 40-50 degrees, about 45 degrees, etc.) with the radial plane of the rotor shaft 41 passing through the first blade section 421, and the first grinding groove 426 and the second grinding groove 427 may advantageously improve the effect of scraping the powder adhering to the barrel bottom 31 and the barrel 30, significantly reduce the abrasion of the agitator and the barrel bottom 31 and the barrel 30, and effectively reduce the agitation power and energy consumption.
In some cases, the second blade includes a third blade segment 423, a fourth blade segment 424, and a fifth blade segment 425 each having a flat plate shape, one end of the third blade segment 423 is fixedly connected to the lower portion of the shaft 41 and the other end extends in a direction perpendicular to the shaft 41 axis until being connected to one end of the fourth blade segment 424, the other end of the fourth blade segment 424 extends upward in a direction at a first angle a (the first angle a may be 45-85 degrees, such as 50-80 degrees, 55-75 degrees, 60-70 degrees, about 65 degrees, etc.) with the shaft 41 axis until being connected to one end of the fifth blade segment 425, the other end of the fifth blade segment 425 forms a second angle b (the second angle b may be 45-85 degrees, such as 50-80 degrees, 55-75 degrees, 60-70 degrees, about 65 degrees, etc., and is larger than the first angle a), an axial plane passing through the third blade segment 423 and the fourth blade segment forms an angle c (the third angle c may be 45-90 degrees, such as 45-90 degrees, 55-75 degrees, about 65 degrees, etc.) with the shaft 41 axis is rotated in an opposite direction to the stirrer; the angle between the plane of the third paddle section 423 and the axis of the paddle shaft 41 is generally smaller than the angle between the plane of the first paddle section 421 and the axis of the paddle shaft 41, for example, the angle between the plane of the third paddle section 423 and the axis of the paddle shaft 41 may be 10-80 degrees, for example, 20-70 degrees, 30-60 degrees, 40-50 degrees, etc., preferably about 45 degrees, so that the upper surface of the third paddle section 423 faces the rotation direction when the agitator rotates to more effectively throw the powder upward, and the interval between the surface of the third paddle section 423 facing the barrel bottom 31 and the upper surface of the barrel bottom 31 is 1-10 mm, for example, 1-5 mm, 1-4 mm, 1-3 mm, 1-2 mm, etc., so as to sweep the powder adhering to the barrel bottom 31. In some cases, the third paddle section 423 is further provided with a third grinding groove 428 on a surface facing the barrel bottom 31, the third grinding groove 428 may have a width of 1-10 mm (e.g., 2-9 mm, 3-8 mm, 4-6 mm, about 5 mm, etc.), the third grinding groove 428 may have a depth of 1-10 mm (e.g., 2-9 mm, 3-8 mm, 4-6 mm, about 5 mm, etc.), the length direction of the third grinding groove 428 forms a third angle z (the third angle z may be 15-75 degrees, e.g., 20-70 degrees, 30-60 degrees, 40-50 degrees, about 45 degrees, etc.) with the axial plane of the paddle shaft 41 passing through the third paddle section 423, and the third grinding groove 428 may further advantageously improve the effect of scraping the powder adhering to the barrel bottom 31, significantly reduce the abrasion of the agitator and the barrel bottom 31, and effectively reduce the agitation power and energy consumption.
In some cases, the third blade includes a sixth blade section 431 and a seventh blade section 432 each having a flat plate shape, one end of the sixth blade section 431 is fixedly connected to the upper portion of the blade shaft 41 and the other end extends in a direction perpendicular to the axis of the blade shaft 41 until being connected to one end of the seventh blade section 432, and the other end of the seventh blade section 432 extends downward in a direction parallel to the axis of the blade shaft 41; the angle between the plane of the sixth paddle section 431 and the axis of the paddle shaft 41 is 10 to 80 degrees, such as 20 to 70 degrees, 30 to 60 degrees, 40 to 50 degrees, etc., preferably about 60 degrees, so that the lower surface of the sixth paddle section 431 faces the rotation direction when the agitator rotates to throw the powder downward, and the interval between the surface of the sixth paddle section 431 facing the cylinder top 32 and the lower surface of the cylinder top 32 is 1 to 10 mm, such as 1 to 5 mm, 1 to 4 mm, 1 to 3 mm, 1 to 2 mm, etc., so as to scrape the powder adhering to the cylinder top 32; the seventh paddle section 432 has a spacing between the face facing the barrel 30 and the inner surface of the barrel 30 of 1-10 millimeters, such as 1-5 millimeters, 1-4 millimeters, 1-3 millimeters, 1-2 millimeters, etc., to sweep powder adhering to the inner wall of the barrel 30. In some cases, the sixth paddle section 431 is further provided with a fourth grinding groove 436 on a face facing the barrel top 32, the fourth grinding groove 436 may have a width of 1-10 millimeters (e.g., 2-9 millimeters, 3-8 millimeters, 4-6 millimeters, about 5 millimeters, etc.), the fourth grinding groove 436 may have a depth of 1-10 millimeters (e.g., 2-9 millimeters, 3-8 millimeters, 4-6 millimeters, about 5 millimeters, etc.), and the fourth grinding groove 436 may have a length that forms a fourth angle (the fourth angle may be 15-75 degrees, e.g., 20-70 degrees, 30-60 degrees, 40-50 degrees, about 45 degrees, etc.) with an axial plane of the paddle shaft 41 that passes through the sixth paddle section 431; the seventh paddle section 432 is further provided with a fifth grinding groove 437 on a face of the paddle section 432 facing the barrel 30, the fifth grinding groove 437 may have a width of 1-10 mm (e.g., 2-9 mm, 3-8 mm, 4-6 mm, about 5 mm, etc.), the fifth grinding groove 437 may have a depth of 1-10 mm (e.g., 2-9 mm, 3-8 mm, 4-6 mm, about 5 mm, etc.), the length direction of the fifth grinding groove 437 makes a fifth angle (the fifth angle may be 15-75 degrees, e.g., 20-70 degrees, 30-60 degrees, 40-50 degrees, about 45 degrees, etc.) with a radial plane of the paddle shaft 41 passing through the sixth paddle section 431, the fourth grinding groove 436 and the fifth grinding groove 437 may advantageously improve the effect of scraping the powder adhering to the crown 32 and the barrel 30, significantly reduce the abrasion of the agitator and crown 32 and the barrel 30, and effectively reduce the agitation power and energy consumption.
In some cases, the fourth blade includes eighth, ninth and tenth blade sections 433, 434, 435 each in a flat plate shape, one end of the eighth blade section 433 being fixedly connected to an upper portion of the shaft 41 and the other end extending in a direction perpendicular to an axis of the shaft 41 until being connected to one end of the ninth blade section 434, the other end of the ninth blade section 434 extending downward in a direction at a fourth angle (fourth angle may be 45-85 degrees, such as 50-80 degrees, 55-75 degrees, 60-70 degrees, about 65 degrees, etc.) to the shaft 41 axis until being connected to one end of the tenth blade section 435, the other end of the tenth blade section 435 forming a fifth angle (fifth angle may be 45-85 degrees, such as 50-80 degrees, 55-75 degrees, 60-70 degrees, about 65 degrees, etc., and greater than the fourth angle) to the shaft 41 axis plane passing through the eighth blade section 433 and the ninth blade section being at a sixth angle (sixth angle may be 45-90 degrees, such as 45-90 degrees, 55-75 degrees, 60-70 degrees, about 65 degrees, etc.) to the agitator; the angle between the plane of the eighth paddle section 433 and the axis of the paddle shaft 41 is generally smaller than the angle between the plane of the sixth paddle section 431 and the axis of the paddle shaft 41, for example, the angle between the plane of the eighth paddle section 433 and the axis of the paddle shaft 41 may be 10-80 degrees, for example, 20-70 degrees, 30-60 degrees, 40-50 degrees, etc., preferably about 45 degrees, so that the lower surface of the eighth paddle section 433 faces the rotation direction when the agitator rotates to more effectively throw the powder downward, and the interval between the surface of the eighth paddle section 433 facing the cylinder top 32 and the lower surface of the cylinder top 32 is 1-10 mm, for example, 1-5 mm, 1-4 mm, 1-3 mm, 1-2 mm, etc., so as to sweep the powder adhering to the cylinder top 32. In some cases, the eighth paddle section 433 is further provided with a sixth grinding slot 438 on a face facing the crown 32, the sixth grinding slot 438 may have a width of 1-10 millimeters (e.g., 2-9 millimeters, 3-8 millimeters, 4-6 millimeters, about 5 millimeters, etc.), the sixth grinding slot 438 may have a depth of 1-10 millimeters (e.g., 2-9 millimeters, 3-8 millimeters, 4-6 millimeters, about 5 millimeters, etc.), the length of the sixth grinding slot 438 may form a sixth angle (the sixth angle may be 15-75 degrees, e.g., 20-70 degrees, 30-60 degrees, 40-50 degrees, about 45 degrees, etc.) with an axial plane of the paddle shaft 41 passing through the eighth paddle section 433, and the sixth grinding slot 438 may further advantageously improve the effect of scraping the powder attached to the crown 32, significantly reduce the wear of the agitator and crown 32, and effectively reduce the agitation power and energy consumption.
In some cases, the fifth blade 441 is flat, one end of which is fixed to the middle of the shaft 41, and the other end of which extends in a direction perpendicular to the axis of the shaft 41, and the angle between the plane of the fifth blade 441 and the axis of the shaft 41 is 10-80 degrees, for example, 20-70 degrees, 30-60 degrees, 40-50 degrees, and the like, preferably about 45 degrees, so that the upper surface of the fifth blade 441 faces the rotation direction when the agitator rotates to throw the powder upward. The distance between the other end of the fifth blade 441 away from the shaft 41 and the inner surface of the cylinder 30 is 10-500 mm, for example, 20-300 mm, 30-200 mm, 40-100 mm, 50-80 mm, etc. Such an arrangement may advantageously reduce the strength of the powder being thrown up away from the paddle shaft 41, advantageously avoiding excessive impact of the powder on the cartridge roof 32 and escape from the air outlet 323. In other cases, the fifth blade 441 has a curved surface gradually twisted along its length, where the angle m between the surface of the end of the fifth blade 441 connected to the shaft 41 and the axis of the shaft 41 is 10-80 degrees, for example, 20-70 degrees, 30-60 degrees, 40-50 degrees, and preferably about 45 degrees, and the angle n between the surface of the other end of the fifth blade 441 remote from the shaft 41 and the axis of the shaft 41 is 10-80 degrees, for example, 20-70 degrees, 30-60 degrees, 40-50 degrees, and preferably about 60 degrees, and the angle m is smaller than the angle n, so that the strength of the powder thrown up away from the shaft 41 can be further reduced without excessively reducing the stirring strength, which is beneficial to avoid the powder from excessively striking the top 32 and escaping from the air outlet 323.
Another aspect of the present invention provides a powder surface modification method comprising the steps of:
s100, providing the powder surface modification device;
s200, adding powder to be modified into a charging barrel from a powder feeding hole 321;
s300, adding a modifier into the charging barrel from a modifier feeding hole 322 and contacting with the powder;
s400, introducing air inlet at a first temperature into a charging barrel from an air inlet 311 to fluidize powder, and starting a stirrer to stir the fluidized powder for a first time to finish surface modification of the powder; preferably, the intake air volume is controlled so that the upper surface of the fluidized powder is lower than the cylinder top 32;
s500, optionally, introducing inlet air with a second temperature from an inlet 311 into a charging barrel to fluidize the powder, and starting a stirrer to stir the fluidized powder for a second time to cool the surface-modified powder;
and S600, discharging the surface modified powder from the discharge hole 33.
In some cases, according to the need of powder modification, the temperature of different positions in the barrel can be measured by the thermometers at the first temperature measuring port 34, the second temperature measuring port 35 and the third temperature measuring port 36 in step S400, and the temperature, pressure and air volume of the inlet air can be controlled accordingly.
In some cases, step S300 may be completed before step S400, or the former stage of step S300 may be completed before step S400 and the latter stage may be completed in step S400, or the entire step S30 may be completed in step S400, according to the need of powder modification.
In some cases, in steps S400 and S500, the powder located at (especially attached to) the bottom 31 and the lower inner wall of the cylinder 30 is scraped and thrown up by the first set of paddles 42, and the powder located at (especially attached to) the top 32 and the upper inner wall of the cylinder 30 is scraped and thrown down by the second set of paddles 43. In some cases, in steps S400 and S500, the powder at the bottom 31 and the lower inner wall of the cylinder 30 is milled and thrown up using the first, second and third milling grooves 426, 427 and 428, and the powder at the top 32 and the upper inner wall of the cylinder 30 is milled and thrown down using the fourth, fifth and sixth milling grooves 436, 437 and 438. In some cases, in steps S400 and S500, the powder in the cartridge is stirred and thrown up with the third set of paddles 44.
The powder surface modification device and the powder surface modification method have the following technical effects: the crushing of powder particles can be reduced under the condition that the powder and the modifier are fully mixed under the combined action of light fluidization and mechanical stirring, the stirring intensity required by uniform mixing can be reduced by fluidization, so that stirring energy consumption and equipment abrasion are reduced, the rapid, uniform and accurate temperature control of the powder can be realized by controlling the air inlet temperature, the full mixing of the powder and the modifier can be realized under the condition of reducing the air inlet quantity, the dust discharge is reduced, so that the dust removal burden is reduced, and the energy consumption required by controlling the air inlet temperature can be reduced by reducing the air inlet quantity; in addition, by using the stirrer provided by the invention, particles positioned (especially adhered to) the inner wall of the charging barrel can be scraped and milled, so that the particles are separated from the wall surface and are broken into powder particles, and even powder particle agglomerates in powder in the charging barrel can be milled and broken into powder particles, so that the burden of sieving out the agglomerates after modification can be reduced, and the yield of the surface modified powder can be improved. In conclusion, the powder surface modification device and method have the advantages of uniform modification temperature, rapid temperature rise and fall, small powder breakage rate, high modified powder yield, low comprehensive energy consumption, less equipment abrasion, no particle adhesion on the inner wall of the equipment and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. The powder surface modifying device comprises a charging barrel formed by a barrel body, a barrel bottom and a barrel top, and a stirrer arranged in the charging barrel, wherein the barrel top is provided with an air outlet for exhausting air, the barrel bottom is provided with an air inlet, an air permeable plate is arranged in the air inlet and allows air to enter the charging barrel but not allow powder to flow out of the charging barrel, the air inlet is communicated with an air source and is used for guiding air into the charging barrel, the stirrer comprises a first group of blades arranged in the bottom of the charging barrel and a second group of blades arranged in the top of the charging barrel, the first group of blades comprises a first blade capable of scraping powder on the inner surface of the barrel bottom and the inner surface of the lower part of the barrel and a second blade capable of scraping powder on the upper part of the barrel, and the second group of blades comprises a third blade capable of scraping powder on the inner surface of the barrel top and the inner surface of the upper part of the barrel and a fourth blade capable of downwards polishing powder;
the first blade comprises a first blade section and a second blade section which are respectively in a flat plate shape, one end of the first blade section is fixedly connected to the lower part of the blade shaft, the other end of the first blade section extends along the direction vertical to the axis of the blade shaft until being connected with one end of the second blade section, and the other end of the second blade section extends upwards along the direction parallel to the axis of the blade shaft; the third blade comprises a sixth blade section and a seventh blade section which are respectively in a flat plate shape, one end of the sixth blade section is fixedly connected to the upper part of the blade shaft, the other end of the sixth blade section extends along the direction vertical to the axis of the blade shaft until being connected with one end of the seventh blade section, and the other end of the seventh blade section extends downwards along the direction parallel to the axis of the blade shaft;
the included angle between the plane of the first paddle section and the axis of the paddle shaft is 10-80 degrees, so that the upper surface of the first paddle section faces the rotating direction when the stirrer rotates so as to throw the powder upwards, and the distance between the plane of the first paddle section facing the cylinder bottom and the upper surface of the cylinder bottom is 1-10 millimeters so as to sweep the powder attached to the cylinder bottom; the distance between the surface of the second paddle section facing the cylinder body and the inner surface of the cylinder body is 1-10 mm so as to scrape powder adhered to the inner wall of the cylinder body; the included angle between the plane of the sixth paddle section and the axis of the paddle shaft is 10-80 degrees, so that the lower surface of the sixth paddle section faces the rotating direction when the stirrer rotates so as to throw powder downwards, and the distance between the surface of the sixth paddle section facing the top of the cylinder and the lower surface of the top of the cylinder is 1-10 millimeters so as to sweep the powder attached to the top of the cylinder; the distance between the surface of the seventh paddle section facing the cylinder body and the inner surface of the cylinder body is 1-10 mm so as to scrape powder adhered to the inner wall of the cylinder body;
the surface of the first paddle section, which faces the bottom of the cylinder, is provided with a first grinding groove, the length direction of the first grinding groove and the axial plane of the paddle shaft, which passes through the first paddle section, form a first included angle of 15-75 degrees, and the depth of the first grinding groove is 1-10 mm; the surface of the second paddle section facing the cylinder body is provided with a second grinding groove, the length direction of the second grinding groove and the radial plane of the paddle shaft passing through the first paddle section form a second included angle of 15-75 degrees, and the depth of the second grinding groove is 1-10 mm; a fourth grinding groove is further formed in the surface, facing the top of the cylinder, of the sixth paddle section, a fourth included angle of 15-75 degrees is formed between the length direction of the fourth grinding groove and the axial plane of the paddle shaft, which passes through the sixth paddle section, and the depth of the fourth grinding groove is 1-10 mm; the surface of the seventh paddle section facing the cylinder body is also provided with a fifth grinding groove, the length direction of the fifth grinding groove and the radial plane of the paddle shaft passing through the sixth paddle section form a fifth included angle of 15-75 degrees, and the depth of the fifth grinding groove is 1-10 mm.
2. The powder surface modifying apparatus according to claim 1, wherein the second blade includes a third blade section, a fourth blade section and a fifth blade section each having a flat plate shape, one end of the third blade section being fixedly connected to a lower portion of the blade shaft and the other end extending in a direction perpendicular to the blade shaft axis until being connected to one end of the fourth blade section, the other end of the fourth blade section extending upward in a direction at a first angle of 45 to 85 degrees to the blade shaft axis until being connected to one end of the fifth blade section, the other end of the fifth blade section extending upward backward in a second angle of 45 to 85 degrees to the blade shaft axis, a third angle of 45 to 90 degrees to an axial plane of the blade shaft passing through the third blade section and the fourth blade section, and a direction opposite to a rotational direction of the agitator; the fourth blade comprises an eighth blade section, a ninth blade section and a tenth blade section which are respectively in a flat plate shape, one end of the eighth blade section is fixedly connected to the upper part of the blade shaft, the other end of the eighth blade section extends along the direction perpendicular to the axis of the blade shaft until being connected with one end of the ninth blade section, the other end of the ninth blade section extends downwards along the direction forming a fourth angle of 45-85 degrees with the axis of the blade shaft until being connected with one end of the tenth blade section, and the other end of the tenth blade section extends backwards and downwards along the fifth angle forming 45-85 degrees with the axis of the blade shaft, and forms a sixth angle forming 45-90 degrees with the axial plane passing through the eighth blade section and the ninth blade section and the direction opposite to the rotation direction of the stirrer.
3. The powder surface modification device according to claim 2, wherein a third grinding groove is further formed in the surface, facing the bottom of the barrel, of the third paddle section, a third included angle of 15-75 degrees is formed between the length direction of the third grinding groove and the axial plane of the paddle shaft passing through the third paddle section, and the depth of the third grinding groove is 1-10 mm; the surface of the eighth paddle section facing the top of the cylinder is also provided with a sixth grinding groove, the length direction of the sixth grinding groove and the axial plane of the paddle shaft passing through the eighth paddle section form a sixth included angle of 15-75 degrees, and the depth of the sixth grinding groove is 1-10 mm.
4. The powder surface modifying apparatus according to any one of claims 1 to 3, wherein the agitator further comprises a third group of blades provided in a central portion of the cartridge, the third group of blades being fixed to the central portion of the shaft and comprising a fifth blade capable of throwing the powder toward an upper portion of the cartridge.
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| CN109200976A (en) * | 2017-06-30 | 2019-01-15 | 襄阳福源兴盛科技有限公司 | Produce the agitating device of carboxylic styrene butadiene latex |
| CN107715774A (en) * | 2017-07-06 | 2018-02-23 | 东莞市创明电池技术有限公司 | Lithium battery closes paste-making method and solid powder premixing device |
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