CN114526595B - Preparation device and preparation method of low-dielectric-constant silicon micro powder - Google Patents
Preparation device and preparation method of low-dielectric-constant silicon micro powder Download PDFInfo
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- CN114526595B CN114526595B CN202210263269.3A CN202210263269A CN114526595B CN 114526595 B CN114526595 B CN 114526595B CN 202210263269 A CN202210263269 A CN 202210263269A CN 114526595 B CN114526595 B CN 114526595B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
- F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention belongs to the technical field of silicon micropowder, and particularly relates to a preparation device and a preparation method of low-dielectric-constant silicon micropowder, wherein the preparation method of the low-dielectric-constant silicon micropowder comprises the following steps: s1, ball milling equipment is adopted, ethanol is added into the ball milling equipment, ball milling is carried out for 15-35 hours, and then the ball milling equipment is taken out, filtered and screened for later use; s2: putting the powder material obtained by screening in the step S1 into drying equipment, heating and drying the material by introducing dry hot gas, putting the material into a calcining furnace, calcining for 4 to 26 hours at the temperature of 600 to 1400 ℃, and taking out the material for later use; s3: and (3) crushing the calcined material in the step (S2), screening and filtering, and finally screening to obtain the low-dielectric-constant silicon micro powder.
Description
Technical Field
The invention belongs to the technical field of silicon micropowder, and particularly relates to a preparation device and a preparation method of low-dielectric-constant silicon micropowder.
Background
The silicon micropowder is prepared from natural quartz or fused quartz by crushing, dry grinding or wet grinding, and is a nontoxic and pollution-free inorganic nonmetallic material and widely applied to high-performance microwave components.
During the production and preparation process of the silicon micropowder, a plurality of devices are used, such as a crusher, a grinder, a dryer and the like; grinding raw materials for producing and preparing silicon micropowder into powder by a grinder, adding some liquid such as ethanol or purified water in the grinding process to accelerate the grinding efficiency and quality of the materials, drying the materials after grinding, and drying the materials by a drying device;
present drying equipment when drying the material, because of the silica micropowder raw materials powderization back, meets water again and forms the congee, present equipment can't fully roll the material and dry, and partial material fails in time to contact the heat source and dries, leads to needing to arrange drying equipment in for a long time, and the stirring that rolls is repeated many times, makes its inside moisture scatter and disappear gradually, and is inefficient, can't be adapted to present rapid development's demand.
Therefore, the invention provides a preparation device and a preparation method of low-dielectric-constant silicon micro powder.
Disclosure of Invention
To remedy the deficiencies of the prior art, at least one of the technical problems set forth in the background is addressed.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a preparation device and a preparation method of low dielectric constant silicon micro powder, wherein the preparation method of the low dielectric constant silicon micro powder comprises the following steps:
s1: preparing raw materials, mixing CaCO3, mgO, siO2 and Al2O3 in parts by weight, putting the mixture into ball milling equipment, adding ethanol into the ball milling equipment, carrying out ball milling for 15-35 hours, taking out the ball milling equipment, and filtering and screening the ball milling equipment for later use;
s2: putting the powder material obtained by screening in the step S1 into drying equipment, heating and drying the material by introducing dry hot gas, putting the material into a calcining furnace, calcining for 4 to 26 hours at the temperature of 600 to 1400 ℃, and taking out the material for later use;
s3: and (3) crushing the calcined material in the step (S2), screening and filtering, and finally screening to obtain the low-dielectric-constant silicon micro powder.
Preferably, the powder material in the S2 is put into a drying device, the residual drying moisture is controlled to be 20-30%, the powder material is in a block shape, is crisp but not powdery, and does not generate dust raising phenomenon.
A preparation device of low dielectric constant silicon micropowder is drying equipment in S2 and is used for preparing the low dielectric constant silicon micropowder, and comprises a cylinder and a material pushing unit; the two ends of the barrel are horizontally erected on the ground through the supporting plate, the inner side wall of the barrel is provided with a heating resistance wire, a feeding groove is formed above one end of the barrel, a discharge hole is reserved at the other end of the barrel, and a push-pull unit is arranged in the barrel; the pushing unit comprises a driving shaft and a spiral blade; two ends of the driving shaft are rotatably connected to two ends of the cylinder body, and the middle part of the driving shaft is fixedly connected with the spiral blade; a through hole is formed in the driving shaft, the driving shaft is rotationally communicated with an external air supply pump, a plurality of exhaust channels are formed in the surface of the spiral blade, and the exhaust channels are communicated with the through hole; the method comprises the steps that a driving shaft is driven to rotate through a motor, dry hot air is injected into a through hole through an external air supply pump, the temperature of the air is controlled to be 70-90 ℃, the air flows to an exhaust channel along the through hole and is discharged from an air outlet end of the exhaust channel, then ball milling screening is carried out to obtain materials, most of the water is drained, then the materials are poured into a barrel body from a feeding groove, the materials are pushed by spiral blades to gradually move towards a discharge hole of the barrel body, the barrel body is heated by a heating resistance wire in the moving process, the materials are heated and dried, the temperature of the materials is increased, dry hot air is discharged from the air outlet hole of the exhaust channel, the air impacts the materials to disperse the materials, the auxiliary spiral blades push the materials to disperse and roll the materials, and the hot air is directly contacted with the materials when the materials are impacted by the air, so that the drying efficiency of the materials is improved.
Preferably, a protection unit is arranged between the through hole and the exhaust channel; the protection unit comprises a rubber head, a pull rope, a pull block and a blocking block; the rubber head is fixedly connected with the exhaust channel and is in a hillside shape, the rubber head is provided with an air outlet, a chute is formed in the exhaust channel, the bottom of the chute is an air outlet end of the exhaust channel, the air inlet end of the exhaust channel is communicated with the through hole, and the air outlet end of the exhaust channel is opposite to the air outlet; one end of the plugging block is connected in the sliding groove in a sliding mode through a spring and is arranged between the air outlet end and the air outlet of the exhaust channel, the other end of the plugging block is fixedly connected with one end of a pull rope, the other end of the pull rope penetrates into the through hole in a sliding mode and is fixedly connected with a pull block which is connected in the through hole in a sealing and sliding mode, and the pull block is connected to the inner side wall of the through hole in a sliding mode through the spring; when the gas is discharged from the exhaust channel, the material in the cylinder cannot be filled into the exhaust channel due to the gas pressure of the gas, and when the gas is decompressed or the gas pressure is reduced, the gas pressure at the outlet of the exhaust channel cannot block the filling of the material, so that the exhaust channel is filled and blocked by the material; the materials are dried and solidified in the exhaust channel, so that the exhaust channel cannot be normally used, and the blowing and drying efficiency of the materials is influenced; set up the protection unit, alright solve above-mentioned problem, gas impact is on drawing the piece, draw the piece to remove to the gas flow direction along the through-hole, draw a pulling rope, rope pulling plugging block, the plugging block removes and opens, gas outlet and exhaust passage's venthole intercommunication this moment, gas is discharged from the gas outlet of rubber head, and act on the material, when gas pressure reduces, plugging block and drawing block reset gradually, the plugging block plugs up exhaust passage, avoid the material to fill the emergence of getting into exhaust passage internal phenomenon.
Preferably, the inner side of the opening of the air outlet is annular, an elastic contact is arranged on the inner side of the opening of the air outlet, one end of the elastic contact is spherical and is embedded into the inner side of the opening of the air outlet, and the other end of the elastic contact is obliquely and fixedly connected to the upper surface of the other end of the plugging block; the plugging block moves, the elastic contact is pulled to move, one end of the elastic contact is separated from the gas outlet, the gas outlet is opened, gas is discharged from the gas outlet, when the plugging block resets, the plugging block pushes the elastic contact to move, one end of the elastic contact is plugged into the inner side of the gas outlet again, the gas outlet is plugged, and the phenomenon that materials in the barrel are plugged into the gas outlet to cause the blockage problem of the gas outlet is avoided.
Preferably, a salient point is arranged on the inner surface of the air outlet and close to the middle position of the elastic contact, the salient point is extruded at the middle position of the elastic contact, and the diameter of the outer ring at the middle position of the elastic contact is smaller than the diameter of the outer rings at the two ends of the elastic contact; when elastic contact's one end breaks away from the gas outlet inboard, the bump extrusion is at elastic contact's intermediate position for elastic contact arranges the form of lying prone in, and elastic contact's one end is vertical to be broken away from the gas outlet, makes elastic contact attached and blocking piece surface, then is favorable to the blocking piece to drag elastic contact and removes, and exhaust passage's venthole is opened completely, benefits from the whole intercommunications of gas outlet and exhaust passage, makes gaseous effective discharge.
Preferably, the interior of the spherical part at one end of the elastic contact is hollow, the lower part of one end of the elastic contact is convex, the interior of the convex part is hollow, the hollow part of the convex part is communicated with the hollow part of the spherical part, an extrusion block is arranged on the inner surface of the air outlet and close to the convex part, the surface of the extrusion block is fixedly connected to the inner surface of the air outlet, and the end part of the extrusion block extends to be fixedly connected to the spiral blade; when the elastic contact resets, the protruding part of the elastic contact is attached and extruded on the extrusion block, and the gas inside the protruding part is extruded and blown into the sphere, so that the air pressure inside the sphere is increased, the attachment between one end of the elastic contact and the inner side of the air outlet is tighter, and the possibility that the powdery material permeates into the air outlet along the gap is reduced.
Preferably, a plurality of through grooves are uniformly formed in the outer ring of the driving shaft and communicated with the through holes, an L-shaped air passage is formed in the pulling block, and two ends of the air passage penetrate through the surface of the pulling block; gas effect draws the piece to remove on drawing the piece for the air flue with lead to the groove intercommunication, the gas in the through-hole flows along the air flue, and from leading to the groove discharge, gas effect is on the material, further breaks away the material and heats stoving, raise the efficiency.
Preferably, an anti-blocking unit is arranged in the through groove; the anti-blocking unit comprises a push block and a rubber ring; the rubber ring comprises an outer ring and an inner ring, the outer ring and the inner ring are fixedly connected together through an elastic rubber membrane, the outer ring is fixedly connected to the outer side notch of the through groove, the inner ring is extruded and sleeved at one end of the push block, one end of the push block is T-shaped, the middle position of the push block is connected to the inner side wall of the through groove in a sliding mode through a spring, the other end of the push block is provided with an inclined surface, the inclined surface of the push block is matched with the inclined surface arranged on the pull block, an overflow hole is formed in the push block, the inner hole end of the overflow hole is communicated with the through hole, and the other end of the overflow hole penetrates through the surface of one end of the push block and is located on the inner side of the inner ring; the inclined plane extrusion of drawing the piece is on the inclined plane of ejector pad, and ejector pad extrusion spring stretches out logical groove, and the outer end extrusion of ejector pad struts the inner ring, and overflow hole on the ejector pad exposes in the barrel, and overflow hole opens, draws the air flue on the piece and the overflow hole intercommunication of ejector pad simultaneously, and gas is in the barrel from overflow hole impact, prevents that the interior powder material of barrel from permeating to logical inslot, packs the emergence of phenomenon in the through-hole.
Preferably, a fixed pulley is arranged at the connecting position of the exhaust passage and the through hole, the fixed pulley is connected to the connecting position point of the spiral blade and the driving shaft in a rolling manner, and the other end of the pull rope passes around the fixed pulley and is fixedly connected to the pull block; the rope bypasses the fixed wheel, so that the abrasion between the rope and the driving shaft is reduced, and the service life of the rope is prolonged.
The invention has the following beneficial effects:
1. gas flows to exhaust passage along the through-hole, and discharge from exhaust passage's the end of giving vent to anger, later obtain the ball-milling screening material earlier through the waterlogging caused by excessive rainfall, it is dry with most water drippings, then pour into in the barrel from the feed chute, the material is under the promotion of spiral leaf, the material removes to the discharge opening of barrel gradually, in the removal in-process, the barrel is heated by heating resistor silk, heat drying is carried out to the material, promote material temperature, dry hot gas is discharged from exhaust passage's venthole simultaneously, gas impact is on the material, break away separately the material, supplementary spiral leaf pushes away the material and rolls, and the material is when being strikeed by gas, make the hot gas direct and material contact, accelerate the drying efficiency of material.
2. The gas outlet communicates with the gas outlet of exhaust passage, and gas is discharged from the gas outlet of rubber head to act on the material, when gas pressure reduces, the plugging block resets gradually with the drawing block, and the plugging block plugs the exhaust passage, avoids the material to fill the emergence of getting into the interior phenomenon of exhaust passage.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a flow chart of a method for preparing a low dielectric constant silica powder according to the present invention;
fig. 2 is a perspective view of the drying apparatus of the present invention;
FIG. 3 is a perspective view of the engagement of the drive shaft with the helical blades of the present invention;
FIG. 4 is a cross-sectional view of the engagement of the drive shaft with the helical blade of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A;
FIG. 6 is a partial enlarged view of FIG. 4 at B;
FIG. 7 is a view showing the engagement of the fixed pulley with the pulling rope according to the present invention;
in the figure: the device comprises a cylinder body 1, a feeding groove 2, a driving shaft 3, a spiral blade 4, a through hole 5, an exhaust channel 6, a rubber head 7, a pull rope 8, a pull block 9, a blocking block 10, an air outlet 11, a sliding groove 12, an elastic contact 13, a salient point 14, an extrusion block 15, a through groove 16, an air passage 17, a push block 18, an outer ring 19, an inner ring 20, an overflow hole 21 and a fixed pulley 22.
Detailed Description
The present invention will be further described with reference to the following detailed description so that the technical means, the creation features, the achievement purposes and the effects of the present invention can be easily understood.
The first embodiment is as follows:
referring to fig. 1, a method for preparing a low dielectric constant silica micropowder comprises the following steps:
s1: preparing raw materials, mixing CaCO3, mgO, siO2 and Al2O3 in parts by weight, putting the mixture into ball milling equipment, adding ethanol into the ball milling equipment, carrying out ball milling for 15-35 hours, taking out the ball milling equipment, and filtering and screening the ball milling equipment for later use;
s2: putting the powder material obtained by screening in the step S1 into drying equipment, heating and drying the material by introducing dry hot gas, putting the material into a calcining furnace, calcining for 4 to 26 hours at the temperature of 600 to 1400 ℃, and taking out the material for later use;
s3: and (3) crushing the calcined material in the step (S2), screening and filtering, and finally screening to obtain the low-dielectric-constant silicon micro powder.
And S2, putting the powder material into a drying device, controlling the residual drying moisture to be 20-30%, forming a block shape, being crisp but not powdery, and not generating a dust raising phenomenon.
Referring to fig. 2-4, a device for preparing low dielectric constant silica fume, the device being the drying apparatus described in S2 and being used for preparing the low dielectric constant silica fume, the device comprising a cylinder 1 and a pushing unit; two ends of the barrel body 1 are horizontally erected on the ground through supporting plates, heating resistance wires are arranged on the inner side wall of the barrel body 1, a feeding groove 2 is arranged above one end of the barrel body 1, a discharging hole is reserved at the other end of the barrel body 1, and a push-pull unit is arranged in the barrel body 1; the pushing unit comprises a driving shaft 3 and a spiral blade 4; two ends of the driving shaft 3 are rotatably connected to two ends of the cylinder body 1, the driving shaft 3 is rotatably communicated with an external air supply pump, and the middle part of the driving shaft 3 is fixedly connected with a spiral blade 4; a through hole 5 is formed in the driving shaft 3, a plurality of exhaust channels 6 are formed on the surface of the spiral blade 4, and the exhaust channels 6 are communicated with the through hole 5; the method comprises the steps that a driving shaft 3 is driven to rotate through a motor, dry hot air is injected into a through hole 5 through an external air supply pump, the temperature of the air is controlled to be 70-90 ℃, the air flows to an exhaust passage 6 along the through hole 5 and is discharged from an air outlet end of the exhaust passage 6, then ball milling screening is carried out to obtain materials, most of water is drained, then the materials are poured into a barrel body 1 from a feeding groove 2, the materials are pushed by spiral blades 4 to gradually move towards a discharge hole of the barrel body 1, in the moving process, the barrel body 1 is heated by heating resistance wires, heating and drying are carried out on the materials, the temperature of the materials is improved, meanwhile, the dry hot air is discharged from the air outlet of the exhaust passage 6, the air impacts on the materials to disperse the materials, the materials are pushed and scattered by auxiliary spiral blades 4, the materials are rolled, and when the materials are impacted by the air, the hot air is directly contacted with the materials, and the drying efficiency of the materials is improved.
Referring to fig. 4-5, a protection unit is disposed between the through hole 5 and the exhaust passage 6; the protection unit comprises a rubber head 7, a pull rope 8, a pull block 9 and a blocking block 10; the rubber head 7 is fixedly connected to the exhaust channel 6, the rubber head 7 is in a hillside shape, the rubber head 7 is provided with an air outlet 11, a sliding groove 12 is formed in the exhaust channel 6, the bottom of the sliding groove 12 is an air outlet end of the exhaust channel 6, the air inlet end of the exhaust channel 6 is communicated with the through hole 5, and the air outlet end of the exhaust channel 6 is opposite to the air outlet 11; one end of the plugging block 10 is connected in the sliding groove 12 in a sliding mode through a spring and is arranged between the air outlet end of the exhaust channel 6 and the air outlet 11, the other end of the plugging block 10 is fixedly connected with one end of the pull rope 8, the other end of the pull rope 8 penetrates into the through hole 5 in a sliding mode and is fixedly connected with a pull block 9 connected in the through hole 5 in a sliding mode in a sealing mode, and the pull block 9 is connected to the inner side wall of the through hole 5 in a sliding mode through the spring; when the gas is discharged from the exhaust channel 6, the material in the cylinder cannot be filled into the exhaust channel 6 due to the gas pressure of the gas, and when the gas is decompressed or the gas pressure is reduced, the material cannot be filled due to the gas pressure at the outlet of the exhaust channel 6, so that the exhaust channel 6 is filled and sealed by the material; the materials are dried and solidified in the exhaust passage 6, so that the exhaust passage 6 cannot be normally used, and the blowing and drying efficiency of the materials is influenced; set up the protection unit, alright solve above-mentioned problem, gas impact is on drawing piece 9, draw piece 9 to remove to the gas flow direction along through-hole 5, draw piece 9 pulling rope, rope pulling plugging block 10, plugging block 10 removes and opens, 11 ventholes intercommunications with exhaust passage 6 in the gas outlet 11 this moment, gaseous 11 discharges from the gas outlet of rubber head 7, and be used in on the material, when gas pressure reduces, plugging block 10 resets with drawing piece 9 gradually, plugging block 10 blocks up exhaust passage 6, avoid the material to clog the emergence that gets into exhaust passage 6 interior phenomenon.
Referring to fig. 5, the inside of the mouth of the air outlet 11 is annular, an elastic contact 13 is arranged inside the mouth of the air outlet 11, one end of the elastic contact 13 is spherical and is embedded inside the mouth of the air outlet 11, and the other end of the elastic contact 13 is obliquely and fixedly connected to the upper surface of the other end of the plugging block 10; the plugging block 10 moves, the elastic contact 13 is pulled to move, one end of the elastic contact 13 is separated from the gas outlet 11, the gas outlet 11 is opened, gas is discharged from the gas outlet 11, when the plugging block 10 resets, the plugging block 10 pushes the elastic contact 13 to move, one end of the elastic contact 13 is plugged inside the gas outlet 11 again, the gas outlet 11 is plugged, and the phenomenon that the material in the barrel body 1 is plugged into the gas outlet 11 to cause the blockage problem of the gas outlet 11 is avoided.
Referring to fig. 5, a convex point 14 is arranged on the inner surface of the air outlet 11 near the middle position of the elastic contact 13, the convex point 14 is extruded at the middle position of the elastic contact 13, and the diameter of the outer ring at the middle position of the elastic contact 13 is smaller than the diameter of the outer rings at the two ends of the elastic contact; when elastic contact 13's one end breaks away from gas outlet 11 inboard, bump 14 extrudes at elastic contact 13's intermediate position for elastic contact 13 arranges the form of lying prone in lowly, and elastic contact 13's one end is vertical to break away from gas outlet 11, makes elastic contact 13 attached and blocking piece 10 surface, then is favorable to blocking piece 10 to drag elastic contact 13 and removes, and exhaust passage 6's venthole is opened completely, benefits from gas outlet 11 and the whole intercommunication of exhaust passage 6, makes gas effectively discharge.
Referring to fig. 5, the interior of the spherical portion at one end of the elastic contact 13 is hollow, the lower part of one end of the elastic contact 13 is convex, the interior of the convex portion is hollow, the hollow portion of the convex portion is communicated with the hollow portion of the spherical portion, an extrusion block 15 is arranged on the inner surface of the air outlet 11 near the convex portion, the surface of the extrusion block 15 is fixedly connected to the inner surface of the air outlet 11, and the end of the extrusion block 15 extends to be fixedly connected to the spiral blade 4; when the elastic contact 13 resets, the convex part of the elastic contact 13 is attached to and extruded on the extrusion block 15, and the gas inside the convex part is extruded and blown into the sphere, so that the gas pressure inside the sphere is increased, the attachment between one end of the elastic contact 13 and the inner side of the gas outlet 11 is tighter, and the possibility that the powder material permeates into the gas outlet 11 along the gap is reduced.
Referring to fig. 4 and 6, a plurality of through grooves 16 are uniformly formed in the outer ring of the driving shaft 3, the through grooves 16 are communicated with the through holes 5, an L-shaped air passage 17 is formed in the pull block 9, and two ends of the air passage 17 penetrate through the surface of the pull block 9; gas effect is on drawing piece 9, draws piece 9 to remove for air flue 17 and logical groove 16 intercommunication, the gas in the through-hole 5 flows along air flue 17, and discharges from leading to groove 16, and gas effect is on the material, further breaks up the material and heats the stoving, raises the efficiency.
Referring to fig. 6, an anti-blocking unit is arranged in the through groove 16; the anti-blocking unit comprises a push block 18 and a rubber ring; the rubber ring comprises an outer ring 19 and an inner ring 20, the outer ring 19 and the inner ring 20 are fixedly connected together through an elastic rubber film, the outer ring 19 is fixedly connected at the position of an outer side notch of the through groove 16, the inner ring 20 is extruded and sleeved at one end of the push block 18, one end of the push block 18 is in a T shape, the middle position of the push block 18 is connected to the inner side wall of the through groove 16 in a sliding mode through a spring, the other end of the push block 18 is provided with an inclined plane, the inclined plane of the push block 18 is matched with the inclined plane arranged on the pull block 9, an overflow hole 21 is formed in the push block 18, the inner hole end of the overflow hole 21 is communicated with the through hole 5, and the other end of the overflow hole 21 penetrates through the surface of one end of the push block 18 and is located on the inner side of the inner ring 20; the inclined plane of the pulling block 9 is extruded on the inclined plane of the pushing block 18, the pushing block 18 extrudes the spring and extends out of the through groove 16, the outer end of the pushing block 18 extrudes and expands the inner ring 20, the overflow hole 21 on the pushing block 18 is exposed in the cylinder body 1, the overflow hole 21 is opened, meanwhile, the air channel 17 on the pulling block 9 is communicated with the overflow hole 21 of the pushing block 18, air impacts in the cylinder body 1 from the overflow hole 21, and the phenomenon that powder materials in the cylinder body 1 penetrate into the through groove 16 and are filled in the through hole 5 is prevented.
Example two:
referring to fig. 7, as another embodiment of the present invention, in the first comparative example, a fixed pulley 22 is disposed at a connection position of the exhaust passage 6 and the through hole 5, the fixed pulley 22 is roll-connected to a connection position point of the spiral blade 4 and the driving shaft 3, and the other end of the pull rope 8 passes around the fixed pulley 22 and is fixedly connected to the pull block 9; the rope bypasses the fixed wheel, the abrasion between the rope and the driving shaft 3 is reduced, and the service life of the rope is prolonged.
The working principle is as follows: firstly, a driving shaft 3 is driven to rotate by a motor, dry hot air is injected into a through hole 5 through an external air supply pump, the temperature of the air is controlled to be 70-90 ℃, the air flows to an exhaust passage 6 along the through hole 5 and is discharged from an air outlet end of the exhaust passage 6, then, ball milling screening is carried out to obtain a material, most of water is drained, the material is poured into a cylinder body 1 from a feeding groove 2, the material is gradually moved to a discharge hole of the cylinder body 1 under the pushing of a spiral blade 4, the cylinder body 1 is heated by a heating resistance wire in the moving process, the material is heated and dried, the temperature of the material is raised, dry hot air is discharged from the air outlet of the exhaust passage 6, the air impacts on the material to disperse the material, the material is dispersed and rolled by the auxiliary spiral blade 4, and the hot air is directly contacted with the material when the material is impacted by the air, so that the drying efficiency of the material is accelerated;
when the gas is discharged from the exhaust channel 6, the material in the cylinder cannot be filled into the exhaust channel 6 due to the gas pressure of the gas, and when the gas is decompressed or the gas pressure is reduced, the material cannot be filled due to the gas pressure at the outlet of the exhaust channel 6, so that the exhaust channel 6 is filled and sealed by the material; the materials are dried and solidified in the exhaust passage 6, so that the exhaust passage 6 cannot be normally used, and the blowing and drying efficiency of the materials is influenced; the protection unit is arranged, so that the problem can be solved, gas impacts on the pulling block 9, the pulling block 9 moves along the through hole 5 to the gas flowing direction, the pulling block 9 pulls the rope, the rope pulls the plugging block 10, the plugging block 10 moves to be opened, the gas outlet 11 is communicated with the gas outlet hole of the exhaust channel 6 at the moment, the gas is discharged from the gas outlet 11 of the rubber head 7 and acts on a material, when the gas pressure is reduced, the plugging block 10 and the pulling block 9 gradually reset, the plugging block 10 plugs the exhaust channel 6, and the phenomenon that the material is plugged into the exhaust channel 6 is avoided;
the blocking block 10 moves and pulls the elastic contact 13 to move, one end of the elastic contact 13 is separated from the gas outlet 11, the gas outlet 11 is opened, gas is discharged from the gas outlet 11, when the blocking block 10 resets, the blocking block 10 pushes the elastic contact 13 to move, one end of the elastic contact 13 is plugged at the inner side of the gas outlet 11 again, the gas outlet 11 is plugged, and the phenomenon that the material in the barrel body 1 is plugged into the gas outlet 11 to cause the blockage problem of the gas outlet 11 is prevented;
when one end of the elastic contact 13 is separated from the inner side of the air outlet 11, the salient point 14 is extruded at the middle position of the elastic contact 13, so that the elastic contact 13 is placed in a low-lying mode, one end of the elastic contact 13 is vertically separated from the air outlet 11, the elastic contact 13 is attached to the surface of the blocking block 10, then the blocking block 10 is favorable for dragging the elastic contact 13 to move, an air outlet hole of the exhaust channel 6 is completely opened, and the air outlet 11 is completely communicated with the exhaust channel 6, so that the air is effectively exhausted;
when the elastic contact 13 is reset, the convex part of the elastic contact 13 is attached to and extruded on the extrusion block 15, and the gas in the convex part is extruded and blown into the sphere, so that the gas pressure in the sphere is increased, the attachment between one end of the elastic contact 13 and the inner side of the gas outlet 11 is tighter, and the possibility that the powdery material permeates into the gas outlet 11 along the gap is reduced;
the air acts on the pulling block 9, the pulling block 9 moves, so that the air passage 17 is communicated with the through groove 16, the air in the through hole 5 flows along the air passage 17 and is discharged from the through groove 16, the air acts on the material, the material is further dispersed, heated and dried, and the efficiency is improved;
the inclined plane of the pulling block 9 is extruded on the inclined plane of the pushing block 18, the pushing block 18 extrudes the spring and extends out of the through groove 16, the outer end of the pushing block 18 extrudes and expands the inner ring 20, the overflow hole 21 on the pushing block 18 is exposed in the cylinder body 1, the overflow hole 21 is opened, meanwhile, the air channel 17 on the pulling block 9 is communicated with the overflow hole 21 of the pushing block 18, air impacts in the cylinder body 1 from the overflow hole 21, and the phenomenon that powder materials in the cylinder body 1 penetrate into the through groove 16 and are filled in the through hole 5 is prevented.
The front, the back, the left, the right, the upper and the lower are all based on figure 1 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and so on.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A preparation method of low dielectric constant silica micropowder is characterized by comprising the following steps: the preparation method comprises the following steps:
s1: preparing raw materials, mixing CaCO3, mgO, siO2 and Al2O3 in parts by weight, putting the mixture into ball milling equipment, adding ethanol into the ball milling equipment, carrying out ball milling for 15-35 hours, taking out the ball milling equipment, and filtering and screening the ball milling equipment for later use;
s2: putting the powder material obtained by screening in the step S1 into drying equipment, heating and drying the material by introducing dry hot gas, putting the material into a calcining furnace, calcining for 4 to 26 hours at the temperature of 600 to 1400 ℃, and taking out the material for later use;
s3: crushing the calcined material in the step S2 again, screening and filtering, and finally screening to obtain low-dielectric-constant silicon micro powder;
s2, putting the powder material into a drying device, controlling the residual drying moisture to be 20-30%, forming a block shape, being crisp but not powdery, and not generating a dust raising phenomenon;
the drying equipment in the S2 comprises a cylinder body (1) and a material pushing unit; the device comprises a barrel (1), a heating resistor wire, a feeding groove (2), a discharging hole and a push-pull unit, wherein two ends of the barrel (1) are horizontally erected on the ground through a supporting plate, the heating resistor wire is arranged on the inner side wall of the barrel (1), the feeding groove (2) is arranged above one end of the barrel (1), the discharging hole is reserved at the other end of the barrel (1), and the push-pull unit is arranged in the barrel (1); the pushing unit comprises a driving shaft (3) and a spiral blade (4); two ends of the driving shaft (3) are rotatably connected to two ends of the cylinder body (1), and the middle part of the driving shaft (3) is fixedly connected with the spiral blade (4); a through hole (5) is formed in the driving shaft (3), the driving shaft (3) is communicated with an external air supply pump in a rotating mode, a plurality of exhaust channels (6) are formed in the surface of the spiral blade (4), and the exhaust channels (6) are communicated with the through hole (5);
a protection unit is arranged between the through hole (5) and the exhaust channel (6); the protection unit comprises a rubber head (7), a pull rope (8), a pull block (9) and a blocking block (10); the rubber head (7) is fixedly connected to the exhaust channel (6), the rubber head (7) is in a hill shape, the rubber head (7) is provided with an air outlet (11), a sliding chute (12) is formed in the exhaust channel (6), the bottom of the sliding chute (12) is an air outlet end of the exhaust channel (6), the air inlet end of the exhaust channel (6) is communicated with the through hole (5), and the air outlet end of the exhaust channel (6) is opposite to the air outlet (11); one end of the plugging block (10) is connected in the sliding groove (12) in a sliding mode through a spring, and is arranged between the air outlet end of the exhaust channel (6) and the air outlet (11), the other end of the plugging block (10) is fixedly connected with one end of the stay cord (8), the other end of the stay cord (8) penetrates into the through hole (5) in a sliding mode, the stay block (9) is fixedly connected in the through hole (5) in a sealing and sliding mode, and the stay block (9) is connected to the inner side wall of the through hole (5) through the spring in a sliding mode.
2. The method for preparing a low dielectric constant silica micropowder according to claim 1, characterized in that: the mouth inboard of gas outlet (11) is the annular form, and the mouth inboard of gas outlet (11) is equipped with elastic contact (13), and the one end of elastic contact (13) is spherical to the embedding is in the mouth inboard of gas outlet (11), and the other end slope rigid coupling of elastic contact (13) is at the other end upper surface of shutoff piece (10).
3. A method for preparing a low dielectric constant silica powder according to claim 2, wherein: a salient point (14) is arranged on the inner surface of the air outlet (11) and close to the middle position of the elastic contact (13), the salient point (14) is extruded at the middle position of the elastic contact (13), and the diameter of the outer ring at the middle position of the elastic contact (13) is smaller than that of the outer rings at the two ends of the elastic contact.
4. A method for preparing a low dielectric constant silica micropowder according to claim 3, characterized in that: the inner part of the spherical part at one end of the elastic contact (13) is hollow, the lower part of one end of the elastic contact (13) is convex, the inner part of the convex part is hollow, the hollow part of the convex part is communicated with the hollow part of the spherical part, an extrusion block (15) is arranged on the inner surface of the air outlet (11) and close to the convex part, the surface of the extrusion block (15) is fixedly connected to the inner surface of the air outlet (11), and the end part of the extrusion block (15) extends to the spiral blade (4) and is fixedly connected to the spiral blade.
5. The method for preparing a low dielectric constant silica micropowder according to claim 1, characterized in that: a plurality of through grooves (16) are uniformly formed in the outer ring of the driving shaft (3), the through grooves (16) are communicated with the through holes (5), an L-shaped air passage (17) is formed in the pulling block (9), and two ends of the air passage (17) penetrate through the surface of the pulling block (9).
6. A method for preparing a low dielectric constant silica powder according to claim 5, wherein: an anti-blocking unit is arranged in the through groove (16); the anti-blocking unit comprises a push block (18) and a rubber ring; the rubber ring comprises an outer ring (19) and an inner ring (20), the outer ring (19) and the inner ring (20) are fixedly connected together through an elastic rubber film, the outer ring (19) is fixedly connected to the outer side notch of the through groove (16), the inner ring (20) is sleeved at one end of the push block (18) in an extrusion manner, one end of the push block (18) is T-shaped, the middle position of the push block (18) is connected to the inner side wall of the through groove (16) in a sliding manner through a spring, an inclined plane is arranged at the other end of the push block (18), the inclined plane of the push block (18) is matched with the inclined plane arranged on the pull block (9), an overflow hole (21) is formed in the push block (18), the inner hole end of the overflow hole (21) is communicated with the through hole (5), and the other end of the overflow hole (21) penetrates through the surface of one end of the push block (18) and is located on the inner side of the inner ring (20).
7. The method for preparing a low dielectric constant silica powder according to claim 1, wherein: the exhaust passage (6) is equipped with fixed pulley (22) with through-hole (5) hookup location department, and fixed pulley (22) roll connection is at spiral leaf (4) and drive shaft (3) hookup location point, and fixed pulley (22) are walked around and the rigid coupling is on pulling piece (9) to the other end of stay cord (8).
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