CN113996415A - Ultrasonic wet classification method and device - Google Patents
Ultrasonic wet classification method and device Download PDFInfo
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- CN113996415A CN113996415A CN202111366871.1A CN202111366871A CN113996415A CN 113996415 A CN113996415 A CN 113996415A CN 202111366871 A CN202111366871 A CN 202111366871A CN 113996415 A CN113996415 A CN 113996415A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010333 wet classification Methods 0.000 title claims abstract description 18
- 230000005855 radiation Effects 0.000 claims abstract description 54
- 239000002245 particle Substances 0.000 claims abstract description 35
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims description 29
- 230000007246 mechanism Effects 0.000 claims description 16
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- 238000003780 insertion Methods 0.000 claims description 8
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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
- B02C19/00—Other disintegrating devices or methods
- B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
- B01D29/72—Regenerating the filter material in the filter by forces created by movement of the filter element involving vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
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Abstract
The invention relates to the field of slurry filtration, and discloses an ultrasonic wet classification method and device, wherein the device mainly comprises an ultrasonic radiation assembly which is formed by matching an ultrasonic radiation head, an ultrasonic amplitude transformer and an ultrasonic transducer and is used for scattering large-particle agglomerates in powdery slurry entering a tee pipe. The invention adopts an inserted ultrasonic radiation head, utilizes ultrasonic impact, water jet and cavitation effect generated by the vibration of the ultrasonic radiation head in liquid to radiate the surface of a filter screen in real time, and aggregates are scattered and depolymerized; large particles which cannot pass through the screen can be crushed and refined under the action of ultrasonic cavitation, and finally pass through the filter screen, so that the efficiency is improved; firstly, the particles have a macroscopic motion state under the ultrasonic action, secondly, ultrasonic sound waves are transmitted to the screen through a liquid medium to cause the screen to vibrate, and the two are combined to ensure that the screen is not easy to block, thereby improving the filtering efficiency.
Description
Technical Field
The invention belongs to the field of slurry filtration, and particularly relates to an ultrasonic wet classification method and device.
Background
With the development of science and technology, the requirements for various industrial raw materials and finished products become stricter, and the preparation and treatment technology of powdery slurry becomes more and more important. Because the particle size is not uniform, the range span is large, the dispersion degree is poor and the like in the preparation process of the powder slurry, especially the phenomenon that larger particles or particles are seriously agglomerated exists in the powder slurry, the adverse effects that the application quality of the rear end is uncontrollable, the product performance is greatly reduced and the like are caused, for example, the grinding material micro powder is a product with extremely strict requirements on the particle size distribution, and if the micro powder is mixed with large particles, the surface of a workpiece is easily scratched, so that the workpiece is scrapped and is abandoned. The invention provides an ultrasonic wet classification method and device, aiming at the problems that the filtering device used at present is easy to cause screen hole blockage when filtering large particles and agglomerates.
Disclosure of Invention
In order to solve the problems suggested in the background art described above, the present invention provides an ultrasonic wet classification apparatus, which includes a base frame,
a three-way pipe is arranged above the underframe and consists of a feeding pipe, a discharging pipe and a connecting pipe, and a first fixing mechanism for fixing the three-way pipe is arranged between the three-way pipe and the underframe;
a filter screen is arranged in the discharge pipe;
the connecting pipe is communicated with an ultrasonic radiation head, one end of the ultrasonic radiation head extends into the tee pipe, the other end of the ultrasonic radiation head is connected with an ultrasonic amplitude transformer, one end of the ultrasonic amplitude transformer, which is far away from the ultrasonic radiation head, is connected with an ultrasonic transducer, the ultrasonic transducer is electrically connected with an external ultrasonic power supply, and the ultrasonic radiation head, the ultrasonic amplitude transformer and the ultrasonic transducer are matched to form an ultrasonic radiation assembly for scattering large-particle agglomerates in powdery slurry entering the tee pipe;
and a bracket positioned on the bottom frame is arranged at the bottom of the ultrasonic radiation assembly.
Further, the mounting groove has been seted up near its open-ended position to the inside of discharging pipe, the filter screen is located the mounting groove, and the outside of filter screen and the outside of discharging pipe are in same vertical position, the outside of discharging pipe is provided with outer takeover, a plurality of inserted bars that are the annular array and distribute are installed to outer takeover's inboard, a plurality of jacks that are used for being connected with the inserted bar cooperation are seted up in the outside of discharging pipe, be provided with between outer takeover and the discharging pipe and be used for fixed the two second fixed establishment.
Further, the second fixing mechanism comprises two arc-shaped plates which are symmetrical about the joint of the outer connecting pipe and the discharging pipe, a connector is installed at the end of each arc-shaped plate, each connector is provided with a through hole in a penetrating mode, and a bolt is connected between every two adjacent through holes in a matched mode.
Furthermore, a sealing ring is tightly sleeved on the outer peripheral side of the joint of the outer connecting pipe and the discharging pipe, and the sealing ring is arranged between two clamping rings formed by matching the arc-shaped plates.
Further, the first fixing mechanism comprises a lower arc-shaped clamping seat located below the three-way pipe, a supporting column fixed with the bottom frame is installed at the bottom end of the lower arc-shaped clamping seat, an upper arc-shaped clamping seat is arranged above the three-way pipe, and two screws symmetrical about the three-way pipe are connected between the upper arc-shaped clamping seat and the lower arc-shaped clamping seat in a matched mode.
Furthermore, an annular clamping seat is formed between the upper arc-shaped clamping seat and the lower arc-shaped clamping seat in a matching mode, an elastic ring is clamped on the inner side of the annular clamping seat, and the elastic ring is tightly sleeved on the outer peripheral side of the three-way pipe.
Furthermore, the bottom end of the support is provided with a mounting hole in a penetrating mode, and the support is fixedly connected with the underframe through a screw penetrating through the mounting hole.
In another aspect of the present invention, there is provided an ultrasonic wet classification method, comprising the steps of:
the method comprises the following steps: sequentially connecting an ultrasonic transducer, an ultrasonic amplitude transformer and an ultrasonic radiation head to form an ultrasonic radiation assembly, wherein the ultrasonic transducer is electrically connected with an external ultrasonic power supply, and then inserting the ultrasonic radiation assembly into the three-way pipe from the connecting pipe end of the three-way pipe and fixedly connecting the ultrasonic radiation assembly with the three-way pipe in a quick-mounting flange manner;
step two: installing a filter screen in a discharge pipe of the three-way pipe;
step three: connecting a feed pipe of the three-way pipe with a pipeline;
step four: and (4) turning on an ultrasonic power supply and a circulating pump to enable the powdery slurry to flow into the feeding pipe of the three-way pipe.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts the inserted ultrasonic radiation head, and utilizes the ultrasonic impact, the water jet and the cavitation effect generated by the longitudinal vibration of the ultrasonic radiation head in the liquid to radiate the surface of the filter screen in real time, thereby playing the role of cleaning the filter screen.
(2) In the invention, the cavitation effect generated by the ultrasonic radiation head can break up agglomerated particles to play a role in deagglomeration and dispersion.
(3) The invention can realize the purpose of crushing and refining larger particles under the action of cavitation effect.
(4) The use of ultrasound has the following effects that the aggregate is broken up and depolymerized; large particles which cannot pass through the screen can be crushed and refined under the action of ultrasonic cavitation, and finally pass through the filter screen, so that the efficiency is improved; firstly, the particles have a macroscopic motion state under the ultrasonic action, secondly, ultrasonic sound waves are transmitted to the screen through a liquid medium to cause the screen to vibrate, and the two are combined to ensure that the screen is not easy to block, thereby improving the filtering efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic front view of the present invention;
FIG. 3 is a schematic side view of the present invention;
FIG. 4 is an exploded view of a portion of the present invention;
FIG. 5 is an enlarged view of the structure at A of the present invention;
FIG. 6 is an enlarged view of the structure at B of the present invention;
FIG. 7 is a schematic view of the fixing mechanism of the present invention;
FIG. 8 is a schematic diagram of a second embodiment of the present invention;
FIG. 9 is a diagram illustrating a second exemplary embodiment of the present invention.
In the figure: 1. a chassis; 2. a three-way pipe; 201. a feed pipe; 202. a discharge pipe; 203. a connecting pipe; 3. a first fixing mechanism; 301. a lower arc-shaped clamping seat; 302. a pillar; 303. an upper arc-shaped clamping seat; 304. a screw; 4. filtering with a screen; 5. an ultrasonic radiation head; 6. an ultrasonic horn; 7. an ultrasonic transducer; 8. a support; 9. mounting grooves; 10. an external connection pipe; 11. inserting a rod; 12. a jack; 13. a second fixing mechanism; 1301. an arc-shaped plate; 1302. a connector; 1303. a through hole; 1304. a bolt; 14. a seal ring; 15. an elastic ring; 16. mounting holes; 401. a feeding end; 402. an ultrasonic transducer; 403. an amplitude transformer; 404. an acoustic wave radiating end; 405. a discharge port; 406. an ultrasonic kettle body; 407. an ultrasonic kettle cover; 408. a filter cartridge; 409. a seal ring; 410. a feed pump; 411. a back flushing pump; 41201. a first valve; 41202. a second valve; 41203. a third valve; 41204. a fourth valve; 41205. a fifth valve; 41206. a sixth valve; 41207. a seventh valve; 41301. a first tee joint; 41302. a second tee joint; 41303. a third tee joint; 41304. a fourth tee joint; 41305. a fifth tee joint; 41401. a first pressure gauge; 41402. and a second pressure gauge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the idle place of the device, all the electric devices and the drivers matched with the electric devices are arranged, and all the driving parts, which refer to the power element, the electric devices and the adaptive power supply, are connected through the conducting wires by the person skilled in the art, and specific connecting means refer to the following expressions that the electric connection is completed among the electric devices in sequence, and the detailed connecting means are well known in the art.
Example one
As shown in fig. 1, the ultrasonic wet classification apparatus provided by the present embodiment includes a base frame 1, a three-way pipe 2 is arranged above the base frame 1, the three-way pipe 2 is composed of a feeding pipe 201, a discharging pipe 202 and a connecting pipe 203, and a first fixing mechanism 3 for fixing the three-way pipe 2 is arranged between the three-way pipe 2 and the base frame 1; a filter screen 4 is arranged in a discharge pipe 202 in the three-way pipe 2; an ultrasonic radiation head 5 is communicated with a connecting pipe 203 in the three-way pipe 2, one end of the ultrasonic radiation head 5 extends into the three-way pipe 2, the other end of the ultrasonic radiation head is connected with an ultrasonic amplitude transformer 6, one end, far away from the ultrasonic radiation head 5, of the ultrasonic amplitude transformer 6 is connected with an ultrasonic transducer 7, the ultrasonic transducer 7 is electrically connected with an external ultrasonic power supply, and the ultrasonic radiation head 5, the ultrasonic amplitude transformer 6 and the ultrasonic transducer 7 are matched to form an ultrasonic radiation assembly for scattering large particle agglomerates in powdery slurry entering the three-way pipe 2; in addition, a bracket 8 for supporting the chassis 1 is installed on the bottom of this ultrasonic radiating assembly.
As shown in fig. 4, a mounting groove 9 is provided in the position close to the opening of the discharging pipe 202, the filter screen 4 is located in the mounting groove 9, the outer side of the filter screen 4 and the outer side of the discharging pipe 202 are at the same vertical position, and meanwhile, an external connecting pipe 10 is provided in the outer side of the discharging pipe 202, a plurality of insertion rods 11 distributed in an annular array are installed in the inner side of the external connecting pipe 10, and a plurality of insertion holes 12 used for being connected with the insertion rods 11 in a matching manner are provided in the outer side of the discharging pipe 202, so that when the insertion rods 11 are inserted into the insertion holes 12, the external connecting pipe 10 is attached to the discharging pipe 202, thereby fixing the filter screen 4, and in addition, a second fixing mechanism 13 used for fixing the external connecting pipe 10 and the discharging pipe 202 is further provided between the external connecting pipe 10 and the discharging pipe 202.
The specific structure of the second fixing mechanism 13 is as shown in fig. 4, the second fixing mechanism 13 includes two arc plates 1301 symmetrical about the joint of the external pipe 10 and the discharge pipe 202, a connector 1302 is installed at the end of each arc plate 1301, a through hole 1303 is formed in each connector 1302 in a penetrating manner, a bolt 1304 is connected between two adjacent through holes 1303 in a matching manner, the two arc plates 1301 can be matched to form a snap ring to fix the external pipe 10 and the discharge pipe 202 by screwing the bolt 1304, and through the arrangement, the filter screen 4 can be taken down for replacement instead of being fixed in the pipe.
In order to enhance the sealing performance, as shown in fig. 4, a sealing ring 14 is tightly sleeved on the outer periphery of the joint of the outer connecting pipe 10 and the tapping pipe 202, and the sealing ring 14 is fixedly installed between the clamping rings formed by the two arc-shaped plates 1301 in a matching manner.
The concrete structure of the first fixing mechanism 3 is as shown in fig. 7, the first fixing mechanism 3 comprises a lower arc-shaped clamping seat 301 located below the three-way pipe 2, a supporting column 302 fixed with the bottom frame 1 is installed at the bottom end of the lower arc-shaped clamping seat 301, meanwhile, an upper arc-shaped clamping seat 303 is arranged above the three-way pipe 2, two screws 304 symmetrical about the three-way pipe 2 are connected between the upper arc-shaped clamping seat 303 and the lower arc-shaped clamping seat 301 in a matching mode, the annular clamping seat formed by matching between the upper arc-shaped clamping seat 303 and the lower arc-shaped clamping seat 301 can fix the three-way pipe 2 by screwing the screws 304, in addition, it is worth mentioning that the number of the annular clamping seats is selected according to the actual use condition, and at least one annular clamping seat should be installed on the three-way pipe 2 and the external pipe 10.
As shown in fig. 7, an elastic ring 15 is clamped inside the annular clamping seat, the elastic ring 15 is tightly sleeved on the outer periphery of the three-way pipe 2, and the elastic ring 15 plays a certain role in damping the whole device.
As shown in fig. 6, a mounting hole 16 is formed through the bottom end of the bracket 8, and the bracket 8 and the chassis 1 are fixedly connected by a screw passing through the mounting hole 16.
The ultrasonic wet classification method provided by the specific embodiment comprises the following steps:
the method comprises the following steps: sequentially connecting an ultrasonic transducer 7, an ultrasonic amplitude transformer 6 and an ultrasonic radiation head 5 to form an ultrasonic radiation assembly, wherein the ultrasonic transducer 7 is electrically connected with an external ultrasonic power supply, then inserting the ultrasonic radiation assembly into the three-way pipe 2 from the end of a connecting pipe 203 of the three-way pipe, and fixedly connecting the ultrasonic radiation assembly with the three-way pipe in a quick-mounting flange manner; step two: the sieve 4 is installed in the outlet pipe 202 of the tee 2, where it is locatedThe filter screen 4 is selected to be 500 meshes; step three: connecting a feeding pipe 201 of the three-way pipe 2 with a pipeline; step four: turning on an ultrasonic power supply and a circulating pump to make the powdery slurry flow into a feeding pipe 201 of a three-way pipe 2, wherein the original particle size of the powdery slurry to be filtered is 0.2-25 μm, a small part of large particles are 25-50 μm, the actual powdery slurry is agglomerated and then is 0.5-160 μm, the viscosity is 1000mpas, a 500-mesh filter screen 4 with the pore diameter of 25 μm is selected, the weight of the filtered powdery slurry is 200 kg, and the flow rate is 0.5m3Firstly, rapidly depolymerizing the agglomerated powdery slurry and rapidly passing through a filter screen 4 by using impact, water jet and cavitation effects generated by longitudinal vibration of an ultrasonic radiation head 5; secondly, the filter screen 4 is not easy to block under the action of ultrasonic impact and generated water jet, so that the filtering efficiency is improved; thirdly, under the action of ultrasonic cavitation, larger particles are crushed and refined until the particles smoothly pass through the filter screen 4.
Example two
As shown in fig. 8-9, a method and apparatus for ultrasonic wet classification includes that an ultrasonic transducer 402 is a piezoelectric ceramic disc transducer, which converts a high-frequency oscillation electrical signal of an ultrasonic power supply into longitudinal mechanical vibration (i.e., ultrasonic waves) and transmits the longitudinal mechanical vibration, and has a cylindrical shape, the structure of which is the same as that of the conventional piezoelectric ceramic transducer, and as shown in the figure, a threaded hole is formed in the center of an end surface connected with a horn 403;
the ultrasonic horn 403 is used for amplifying the particle displacement or speed of mechanical vibration, is in the shape of a variable cross-section long cylinder, and has a threaded hole for connection at the center of an axial end face;
the ultrasonic wave radiation end 404 can transmit the ultrasonic wave transmitted by the amplitude transformer 403 to the material to be treated or the liquid medium through the radiation surface. The center of the end surface connected with the amplitude transformer 403 is provided with a threaded hole for connection, the shape of the radiation end is not fixed, and the shape is set according to the technical requirements.
The ultrasonic kettle body 406 can be a circular kettle body, a square kettle body and the like which are not fixed, a flange is arranged at the upper end of the kettle body, and a discharge hole 405 is arranged at the lower end of the kettle body.
The ultrasonic kettle cover 407 has a lower end flange in a form consistent with that of an upper end flange of the ultrasonic kettle, the upper end flange can be connected with the ultrasonic assembly, and an opening in the side wall of the ultrasonic kettle cover 407 serves as a feeding end 401.
The filter cartridge 408 may be unfixed in a cylindrical shape, a square cylindrical shape, or the like, and has a flange at the upper end thereof.
The sealing ring 409 is circular ring, ring-releasing, etc.
The feed pump 410 may be a rotor pump, a screw pump, a diaphragm pump, or the like.
The recoil pump 411 may be a rotor pump, a screw pump, a diaphragm pump, or the like.
The ultrasonic power supply is connected with the ultrasonic transducer 402 through a high-frequency cable, and transmits a high-frequency oscillation electric signal to the ultrasonic transducer 402 and converts the high-frequency oscillation electric signal into mechanical vibration; the front end face and the rear end face of the amplitude transformer 403 are respectively connected with the ultrasonic transducer 402 and the sound wave radiation end through double-end studs, ultrasonic waves generated by the ultrasonic transducer 402 are amplified and transmitted to the sound wave radiation end 404, so that radial and longitudinal vibration is generated, and an ultrasonic assembly is integrated.
Inserting the filter cartridge 408 into the ultrasonic kettle body 406, arranging sealing rings 409 at two sides of a flange of the filter cartridge 408, and then dropping the ultrasonic kettle cover 407 on the upper end of the flange of the filter cartridge 408, so that the flange at the upper end of the ultrasonic kettle body 406, the flange of the filter cartridge 408, the flange at the lower end of the ultrasonic kettle cover 407 and the sealing rings 409 are mutually attached and locked to be fixed, thereby integrating the ultrasonic kettle assembly.
The ultrasonic radiation end 404 is inserted from the upper end of the ultrasonic kettle cover 407, and is fixedly connected with a flange at the upper end of the ultrasonic kettle cover 407 through a transducer shell or a flange carried by the amplitude transformer 403, so as to form 1 ultrasonic kettle unit.
The ultrasonic kettle units can be connected in series by 1 or more ultrasonic kettle units in the grading or filtering process, the connection mode is that the feed pump 410 is connected with the feed end 401 at the side of the ultrasonic kettle cover 407 of the ultrasonic kettle unit through a pipeline, a valve and a tee joint, the discharge port 405 at the lower end of the ultrasonic kettle unit is connected with the feed end 401 at the side of the ultrasonic kettle cover 407 of the ultrasonic kettle unit through a pipeline, a valve and a tee joint, and the ultrasonic kettle units are sequentially connected in this way to form a plurality of ultrasonic kettle unit series structure forms.
The back flushing and discharging process is that the back flushing pump is respectively connected with the discharge port of the ultrasonic kettle unit 1/2 through a pipeline, a valve 4/5 and a tee 2/4/5 and then discharged through the feed port of the ultrasonic kettle unit.
The ultrasonic power supply is a component which converts electric energy into high-frequency alternating current electric signals matched with the ultrasonic transducer 402, the frequency of the electric signals is 15-80kHz, the power is 500-6000W, the ultrasonic electric energy is effectively transmitted to the ultrasonic transducer 402, and the driving of the transducer is realized.
The ultrasonic transducer 402 converts the input electric power into mechanical power that vibrates in the longitudinal direction, and transmits longitudinal waves to the ultrasonic horn.
The ultrasonic horn 403 amplifies the displacement or speed of the mechanical vibration transmitted from the transducer, and transmits the amplified mechanical vibration to the acoustic wave radiating end 404. The amplitude transformer 403 of the method of the invention sets the amplitude of the ultrasonic wave according to the specific engineering requirements, and the special design of the amplitude transformer 403 is carried out.
The ultrasonic radiating end 404, which may be made of stainless steel, TC4, etc., has both radial and longitudinal vibrations, and generates strong shock waves, micro-jets and cavitation effects at 360 °, so that the capacity of the entire local environment inside the filter cartridge 408 is very uniform. Firstly, large particles are in continuous macroscopic motion in liquid under the action of ultrasound, sieve pores are not easy to block, and small particles can pass through the sieve pores quickly and smoothly; second, the agglomerated particles can be subjected to sonication to disperse and deagglomerate, facilitating classification and filtration.
An ultrasonic kettle unit, wherein the grading and filtering processes are an upper inlet and a lower outlet, powder slurry flows into the filter cylinder 408 with ultrasonic waves from the upper end, large particles are blocked off, and small particles smoothly pass through; the back washing and discharging process is that the powder which can not pass through the filter screen is discharged by the way of downward feeding and upward discharging.
The material of the filter cartridge 408 can be metal screen, nylon filter cloth, polymer or ceramic structure; mesh number: 1-10000 meshes; thickness: 0.01-10 mm.
The sealing ring 409 is made of rubber, teflon or the like.
The filtered slurry viscosity ranges from 1 to 20000mpa · s; the flow rate is 0.1-10m 3/h; .
The radial end surface of the sound wave radiation end 404 is 1-100mm away from the inner wall of the filter cartridge.
The pressure in the filter screen is 0-0.6 MPa.
Firstly, an ultrasonic transducer 402, an ultrasonic amplitude transformer 403 and an ultrasonic radiation end 404 are sequentially connected to form an ultrasonic radiation end component; then inserting the filter cartridge 408 into the ultrasonic kettle body 406, wherein sealing rings 409 are arranged on two sides of a flange of the filter cartridge 408, and then dropping the ultrasonic kettle cover 407 on the upper end of the flange of the filter cartridge 408, so that the flange at the upper end of the ultrasonic kettle body 406, the flange of the filter cartridge 408, the flange at the lower end of the ultrasonic kettle cover 407 and the sealing rings 409 are mutually attached and locked to be fixed, and an ultrasonic kettle component is integrated; then the ultrasonic radiation end 404 is inserted from the upper end of the ultrasonic kettle cover 407, and is fixedly connected with a flange at the upper end of the ultrasonic kettle cover 407 through a shell of the ultrasonic transducer 402 or a flange carried by the amplitude transformer 403, so as to form 1 ultrasonic kettle unit. In the embodiment, two-stage ultrasonic kettle units are connected in series to filter graphene slurry in a grading manner, a feeding pump 410 is connected with a feeding port on the side face of an ultrasonic kettle cover of a first ultrasonic kettle unit through a pipeline, a valve 41201 and a tee 41301, a discharging port at the lower end of the first ultrasonic kettle unit is connected with a feeding port on the side face of an ultrasonic kettle cover of a second ultrasonic kettle unit through a pipeline, a valve and a tee, and a discharging port at the lower end of the second ultrasonic kettle unit is connected with a feeding port of a finished product tank through a pipeline, a tee and a valve; the connection mode of the back flushing process is that the back flushing pump 411 is respectively connected with the discharge ports of the first ultrasonic kettle unit and the second ultrasonic kettle unit through a pipeline, a valve and a tee joint, and then discharged through the feed port of the ultrasonic kettle units, and a set of graphene grading and filtering device is set up above to separate large particles in graphene.
The graded filtering process comprises the steps of firstly opening valves (a first valve 41201, a second valve 41202 and a third valve 41203), closing the valves (a fourth valve 41204, a fifth valve 41205, a sixth valve 41206 and a seventh valve 41207), then starting the feeding pump 410 and the ultrasonic power supply, enabling the graphene slurry to flow into the filter cartridge 408 with ultrasonic waves from the feeding port of the first ultrasonic kettle unit, enabling the agglomerated slurry to be rapidly depolymerized and pass through a screen by impact, water jet and cavitation effect generated by simultaneous radial and longitudinal vibration of the ultrasonic radiation end 404, and enabling the screen not to be easily blocked under the action of ultrasonic impact and generated water jet, thereby improving the filtering efficiency. And finally, the finished graphene slurry flows out of the discharge port 2 of the ultrasonic kettle unit 2.
The backwashing process comprises the steps of closing the valves (the first valve 41201, the second valve 41202 and the third valve 41203), opening the valves (the fourth valve 41204, the fifth valve 41205, the sixth valve 41206 and the seventh valve 41207), then opening the backflushing pump 411, respectively cleaning the filter cartridge 408 in the ultrasonic kettle, and flowing out through the sixth valve 41206 and the seventh valve 41207.
The particle size D50 value of the filtered graphene slurry is 5 μm, the particle size of a few large particles is 50-150 μm, the viscosity of the slurry is 2000MPa · s, the flow rate is 0.5m3/h, and the pressure is 0.1-0.2 MPa; the ultrasonic frequency is 20KHz, and the ultrasonic power is 3000W; the particle size distribution range of the finally obtained slurry is 1-10 mu m.
By adopting the inserted ultrasonic radiation end 404, the ultrasonic radiation end 404 has radial and longitudinal vibration simultaneously, and can generate strong shock waves, micro-jet and cavitation effects of 360 degrees in liquid, so that powder slurry needing to be classified or filtered is always in a motion state under the action of ultrasound, the screen mesh is not easy to be blocked, and small particles can rapidly pass through the screen mesh.
The generated cavitation effect can be that the agglomerated particles are broken up to play a role in deagglomeration and dispersion;
the large particles can be broken and refined under the action of cavitation effect;
the device can realize multi-stage series use;
compared with the prior art, the method and the device can realize long-time and high-efficiency classification or filtration of slurry in various states, and have the advantages of convenience in installation, stability in operation, environmental friendliness, low cost and the like.
The power ultrasound is combined with slurry and fluid filtration, and the impact, water jet and cavitation effect generated by the ultrasound in liquid are utilized to realize rapid and high-precision classification or filtration of particles, which is particularly beneficial to wet classification of ultrafine powder. The method and the device are simple to operate, convenient to install and easy to realize engineering application.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. An ultrasonic wet classification device, characterized in that the device comprises a chassis (1),
a three-way pipe (2) is arranged above the underframe (1), the three-way pipe (2) consists of a feeding pipe (201), a discharging pipe (202) and a connecting pipe (203), and a first fixing mechanism (3) for fixing the three-way pipe (2) is arranged between the three-way pipe (2) and the underframe (1);
a filter screen (4) is arranged in the discharge pipe (202);
the connecting pipe (203) is communicated with an ultrasonic radiation head (5), one end of the ultrasonic radiation head (5) extends into the three-way pipe (2), the other end of the ultrasonic radiation head is connected with an ultrasonic amplitude transformer (6), one end, far away from the ultrasonic radiation head (5), of the ultrasonic amplitude transformer (6) is connected with an ultrasonic transducer (7), the ultrasonic transducer (7) is electrically connected with an external ultrasonic power supply, and the ultrasonic radiation head (5), the ultrasonic amplitude transformer (6) and the ultrasonic transducer (7) are matched to form an ultrasonic radiation assembly for scattering large particle agglomerates in powdery slurry entering the three-way pipe (2);
and a bracket (8) positioned on the bottom frame (1) is arranged at the bottom of the ultrasonic radiation component.
2. The ultrasonic wet classification device according to claim 1, wherein the inside of the discharging pipe (202) is provided with a mounting groove (9) at a position close to the opening of the discharging pipe, the filter screen (4) is positioned in the mounting groove (9), the outside of the filter screen (4) and the outside of the discharging pipe (202) are at the same vertical position, the outside of the discharging pipe (202) is provided with an external connecting pipe (10), the inside of the external connecting pipe (10) is provided with a plurality of insertion rods (11) distributed in an annular array, the outside of the discharging pipe (202) is provided with a plurality of insertion holes (12) for being connected with the insertion rods (11) in a matching manner, and a second fixing mechanism (13) for fixing the external connecting pipe (10) and the discharging pipe (202) is arranged between the external connecting pipe (10) and the discharging pipe (202).
3. The ultrasonic wet classification device according to claim 2, wherein the second fixing mechanism (13) comprises two arc-shaped plates (1301) which are symmetrical about the joint of the external connection pipe (10) and the discharge pipe (202), the end of each arc-shaped plate (1301) is provided with a connector (1302), each connector (1302) is provided with a through hole (1303) in a penetrating manner, and a bolt (1304) is connected between every two adjacent through holes (1303) in a matching manner.
4. The ultrasonic wet classification device according to claim 3, characterized in that a sealing ring (14) is tightly sleeved on the outer peripheral side of the joint of the external connection pipe (10) and the discharge pipe (202), and the sealing ring (14) is installed between clamping rings formed by matching the two arc-shaped plates (1301).
5. The ultrasonic wet classification device according to claim 1, wherein the first fixing mechanism (3) comprises a lower arc-shaped clamping seat (301) positioned below the three-way pipe (2), a supporting column (302) fixed with the chassis (1) is installed at the bottom end of the lower arc-shaped clamping seat (301), an upper arc-shaped clamping seat (303) is arranged above the three-way pipe (2), and two screws (304) symmetrical about the three-way pipe (2) are fittingly connected between the upper arc-shaped clamping seat (303) and the lower arc-shaped clamping seat (301).
6. The ultrasonic wet classification device of claim 5, wherein an annular clamping seat is formed between the upper arc-shaped clamping seat (303) and the lower arc-shaped clamping seat (301), an elastic ring (15) is clamped at the inner side of the annular clamping seat, and the elastic ring (15) is tightly sleeved on the outer peripheral side of the three-way pipe (2).
7. The ultrasonic wet classification device according to claim 1, characterized in that a mounting hole (16) is formed through the bottom end of the bracket (8), and the bracket (8) and the chassis (1) are fixedly connected through a screw passing through the mounting hole (16).
8. A method of using the ultrasonic wet fractionation device according to any one of claims 1 to 7, wherein the method comprises the steps of:
the method comprises the following steps: sequentially connecting an ultrasonic transducer (7), an ultrasonic amplitude transformer (6) and an ultrasonic radiation head (5) to form an ultrasonic radiation assembly, wherein the ultrasonic transducer (7) is electrically connected with an external ultrasonic power supply, then inserting the ultrasonic radiation assembly into the three-way pipe (2) from the end of a connecting pipe (203) of the three-way pipe, and fixedly connecting the ultrasonic radiation assembly with the three-way pipe in a quick-mounting flange manner;
step two: installing a filter screen (4) in a discharge pipe (202) of the three-way pipe (2);
step three: connecting a feeding pipe (201) of the three-way pipe (2) with a pipeline;
step four: and turning on an ultrasonic power supply and a circulating pump to enable the powdery slurry to flow in from a feeding pipe (201) of the three-way pipe (2).
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| CN113996415B (en) | 2023-01-03 |
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