Method and device for removing impurities from granular material

Abstract

The present invention provides a method and apparatus for removing impurities from granular materials. The method comprises: using at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode to transmit acoustic waves to the granular materials to be decontaminated, thereby weakening the binding force between the granular materials and impurities in the granular materials to be decontaminated, while simultaneously using airflow to enhance the separation of the impurities and granular materials. The low-frequency acoustic wave gas-guided wave mode is a low-frequency acoustic wave transmitted using gas as a waveguide medium; the high-frequency acoustic wave gas-guided wave mode is a high-frequency acoustic wave transmitted using gas as a waveguide medium; and the high-frequency acoustic wave solid-guided wave mode is a high-frequency acoustic wave transmitted using solid as a waveguide medium. The present invention utilizes the acoustic energy of the acoustic waves to induce acoustic fatigue on the granular materials and impurities attached to their surfaces, thereby weakening or even eliminating the binding force between the granular materials and impurities. Compared with existing technologies, the present invention can quickly and effectively remove impurities from granular materials, with high separation efficiency and precision.

Description

Technical Field

[0001] The invention relates to the technical field of impurity removal, in particular to a method and a device for removing impurities from granular materials. Background Art

[0002] There are many impurities in granular materials. These impurities exist in the form of dust, lint, particles, silk threads, etc., which will have adverse effects on subsequent production processes. In order to remove these impurities, water washing method and mechanical vibration method are generally used. However, these methods have disadvantages such as low separation efficiency, poor separation accuracy, high investment cost and large device size, making it difficult to remove impurities quickly and effectively. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and device for removing impurities from granular materials, so as to solve the problem that it is difficult to remove impurities quickly and effectively in the prior art.

[0004] To achieve the above objectives, the present invention proposes a method for removing impurities from granular materials, comprising: using at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode to transmit acoustic waves to the granular materials to be decontaminated, thereby weakening the binding force between the granular materials and impurities in the granular materials to be decontaminated, and simultaneously using airflow to strengthen the separation of the impurities and the granular materials; wherein: the low-frequency acoustic wave gas-guided wave mode is a low-frequency acoustic wave transmitted using gas as a waveguide medium; the high-frequency acoustic wave gas-guided wave mode is a high-frequency acoustic wave transmitted using gas as a waveguide medium; and the high-frequency acoustic wave solid-guided wave mode is a high-frequency acoustic wave transmitted using solid as a waveguide medium.

[0005] The method for removing impurities from pellets as described above, wherein the method adopts at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode to transmit the acoustic waves to the pellets to be removed, includes: adopting at least two of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode to transmit the acoustic waves to the pellets to be removed.

[0006] The method for removing impurities from pellets as described above, wherein the frequency of the low-frequency sound wave in the low-frequency sound wave gas guided wave mode is one frequency or a combination of multiple frequencies; the frequency of the high-frequency sound wave in the high-frequency sound wave gas guided wave mode is one frequency or a combination of multiple frequencies; and the frequency of the high-frequency sound wave in the high-frequency sound wave solid guided wave mode is one frequency or a combination of multiple frequencies.

[0007] The method for removing impurities from pellets as described above, wherein the waveform of the low-frequency sound wave in the low-frequency sound wave gas guided wave mode is one waveform or a combination of multiple waveforms; the waveform of the high-frequency sound wave in the high-frequency sound wave gas guided wave mode is one waveform or a combination of multiple waveforms; the waveform of the high-frequency sound wave in the high-frequency sound wave solid guided wave mode is one waveform or a combination of multiple waveforms.

[0008] In the method for removing impurities from pellets as described above, the amplitude of the low-frequency sound wave in the low-frequency sound wave gas guided wave mode is one amplitude or a combination of multiple amplitudes; the amplitude of the high-frequency sound wave in the high-frequency sound wave gas guided wave mode is one amplitude or a combination of multiple amplitudes; and the amplitude of the high-frequency sound wave in the high-frequency sound wave solid guided wave mode is one amplitude or a combination of multiple amplitudes.

[0009] In the method for removing impurities from pellets as described above, the frequency of the low-frequency sound wave is 1 Hz to 350 Hz, and the frequency of the high-frequency sound wave is 6 kHz to 40 kHz.

[0010] The method for removing impurities from granular materials as described above, wherein the method adopts at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode to transmit the acoustic waves to the granular materials to be decontaminated, comprises: while the granular materials to be decontaminated are flowing, adopting at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode to transmit the acoustic waves to the granular materials to be decontaminated.

[0011] The present invention also provides a device for removing impurities from granular materials, which is a device used in the above-mentioned method for removing impurities from granular materials. The device includes a shell having a separation chamber and a blower or / and an induced draft fan for introducing airflow into the separation chamber. The device also includes at least one of a low-frequency sound wave generating device, a first high-frequency sound wave generating device, and a high-frequency sound wave solid waveguide component. The working mode of the low-frequency sound wave generating device is the low-frequency sound wave gas waveguide mode, the working mode of the first high-frequency sound wave generating device is the high-frequency sound wave gas waveguide mode, the working mode of the high-frequency sound wave solid waveguide component is the high-frequency sound wave solid waveguide mode, and the high-frequency sound wave solid waveguide component includes a second high-frequency sound wave generating device and a solid waveguide medium connected thereto.

[0012] As described above, the device for removing impurities from granular materials, wherein the outer shell is provided with a granular material inlet and a granular material outlet respectively connected to the separation chamber, and the separation chamber is provided with a drainage device for guiding the granular material to be removed to flow in a dispersed manner in the separation chamber, and the drainage device is arranged between the granular material inlet and the granular material outlet.

[0013] As described above, in the device for removing impurities from granular materials, at least a portion of the drainage device serves as the solid waveguide medium and is connected to the second high-frequency sound wave generating device.

[0014] The device for removing impurities from granular materials as described above, wherein the device further comprises a distributor provided at the granular material inlet, and the distributor spreads the granular materials to be removed from impurities on the drainage device.

[0015] In the device for removing impurities from granular materials as described above, the distributor serves as the solid waveguide medium and is connected to the second high-frequency sound wave generating device.

[0016] The characteristics and advantages of the method and device for removing impurities from pellets of the present invention are:

[0017] The present invention utilizes the acoustic energy of sound waves to induce acoustic fatigue on the pellets and impurities attached to their surfaces, which can weaken or even remove the binding force between the pellets and the impurities, so that gaps or separation are generated between the two, and the attached impurities are converted into dispersed impurities. In combination with wind power and airflow, the dispersed impurities are blown away from the pellets, thereby achieving efficient separation of the pellets and impurities, and deeply purifying the pellets. Compared with the prior art, the present invention can quickly and effectively remove impurities in the pellets, especially attached impurities. The method of the present invention is used to remove impurities in the pellets, with high separation efficiency, high separation precision and low investment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0019] Figure 1 1 is a schematic plan view of the structure of a device for removing impurities from granular materials according to an embodiment of the present invention;

[0020] Figure 2 1 is a schematic diagram of the three-dimensional structure of a device for removing impurities from granular materials according to an embodiment of the present invention;

[0021] Figure 3 yes Figure 2 A top view of the first type of skateboard;

[0022] Figure 4 yes Figure 3 Side view of the middle slide;

[0023] Figure 5 yes Figure 3 A partial enlarged view of point A in the middle;

[0024] Figure 6 This is the main view of the second skateboard;

[0025] Figure 7 yes Figure 6Top view of the middle slide;

[0026] Figure 8 This is the main view of the third skateboard;

[0027] Figure 9 yes Figure 8 Top view of the middle slide;

[0028] Figure 10 This is the main view of the fourth skateboard;

[0029] Figure 11 yes Figure 10 Top view of the middle slide;

[0030] Figure 12 This is the main view of the fifth skateboard;

[0031] Figure 13 yes Figure 12 Top view of the middle slide;

[0032] Figure 14 This is the main view of the sixth skateboard;

[0033] Figure 15 yes Figure 14 Top view of the middle slide;

[0034] Figure 16 This is the main view of the seventh skateboard;

[0035] Figure 17 yes Figure 16 Top view of the middle slide;

[0036] Figure 18 This is the main view of the eighth skateboard;

[0037] Figure 19 yes Figure 18 Top view of the middle slide;

[0038] Figure 20 This is a schematic diagram of the first method of fabrication;

[0039] Figure 21 This is a schematic diagram of the second method of fabrication;

[0040] Figure 22 yes Figure 21 A top view of

[0041] Figure 23 This is a diagram of the third method of fabrication;

[0042] Figure 24 yes Figure 23 A top view of

[0043] Figure 25 This is a diagram of the fourth method of fabrication;

[0044] Figure 26 This is a diagram of the fifth way of laying fabrics;

[0045] Figure 27 yes Figure 26 A top view of

[0046] Figure 28 This is a diagram of the sixth method of fabrication;

[0047] Figure 29 This is a diagram of the seventh way of laying fabrics;

[0048] Figure 30 This is a diagram of the eighth way of laying fabrics;

[0049] Figure 31 This is a diagram of the ninth method of fabrication;

[0050] Figure 32 yes Figure 31 A top view of

[0051] Figure 33 This is a diagram of the tenth way of laying fabrics;

[0052] Figure 34 yes Figure 33 Top view of .

[0053] Description of main component numbers:

[0054] 1. Shell; 11. Separation chamber; 12. Granular material inlet; 13. Granular material outlet;

[0055] 14. Air inlet; 15. Air outlet;

[0056] 2. Low-frequency sound wave generating device; 21. Low-frequency sound wave generator; 22. Low-frequency sound wave converter;

[0057] 3. First high-frequency sound wave generator; 31. First high-frequency sound wave generator;

[0058] 32. First high-frequency sound wave converter; 4. Second high-frequency sound wave generating device;

[0059] 41. A second high-frequency sound wave generator; 42. A second high-frequency sound wave converter;

[0060] 5. Distributor; 51. Feeder; 6. Slide plate; 61. First slide plate;

[0061] 611, vertical plate; 612, inclined plate; 613, through hole; 62, second slide plate;

[0062] 7. Fluidizing plate; 8. Valve;

[0063] O, fabric baseline; K1, granular material to be cleaned; K2, clean granular material; Q, airflow. DETAILED DESCRIPTION

[0064] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings. Among them, the use of adjective or adverbial modifiers "upper" and "lower", "top" and "bottom", "inside" and "outside" is only for the convenience of relative reference between multiple groups of terms, and does not describe any specific directional restrictions on the modified terms. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more. In the description of the present invention, unless otherwise specified, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to the specific circumstances.

[0065] For the convenience of description, the granular material is referred to as "granular material" in this article, and the granular material adsorbed with impurities is referred to as "granular material to be removed from the impurities."

[0066] Impurities in pellets primarily exist in two forms: dispersed and adhered. Adherent impurities cling (adsorb) to the pellet surface due to binding forces such as electromagnetic forces, liquid bridge forces, and van der Waals forces, making them both a challenge and a key factor in pellet cleanliness. Existing technologies typically use methods such as water washing and mechanical vibration to remove impurities from pellets, but these methods suffer from low separation efficiency, poor separation accuracy, high investment costs, and large equipment sizes, making it difficult to quickly and effectively remove impurities, especially adhered impurities.

[0067] Implementation Method 1

[0068] To solve the above-mentioned problems in the prior art, the present invention provides a method for removing impurities from granular materials, comprising: adopting at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode, so that the acoustic energy of the acoustic wave is transmitted to the granular materials to be removed, so as to weaken the binding force between the granular materials and impurities in the granular materials to be removed, such as electromagnetic force, liquid bridge force, van der Waals force, etc. At the same time, an air flow is adopted to strengthen the separation of impurities and granular materials, such as blowing air toward the granular materials to be removed to blow the impurities away from the granular materials, thereby completely separating the granular materials and impurities; wherein: the low-frequency acoustic wave gas-guided wave mode is a low-frequency acoustic wave transmitted using air as a waveguide medium, the high-frequency acoustic wave gas-guided wave mode is a high-frequency acoustic wave transmitted using air as a waveguide medium, and the high-frequency acoustic wave solid-guided wave mode is a high-frequency acoustic wave transmitted using a solid as a waveguide medium. In the present invention, the frequency of the low-frequency acoustic wave is 1 Hz to 350 Hz, preferably 10 Hz to 350 Hz, and the frequency of the high-frequency acoustic wave is 6 kHz to 40 kHz, for example, 9 kHz or 12 kHz.

[0069] The present invention utilizes the acoustic energy of sound waves to induce acoustic fatigue on pellets and impurities attached to their surfaces, weakening or even eliminating the binding force between the pellets and impurities, creating gaps or separation between them, and transforming attached impurities into dispersed impurities. Combined with wind power and airflow, the dispersed impurities are blown away from the pellets, achieving efficient separation of the pellets and impurities, resulting in deep purification of the pellets. Compared with existing technologies, the present invention can quickly and effectively remove impurities, especially attached impurities, from pellets. The method of the present invention achieves high separation efficiency, high separation precision, and low investment costs when removing impurities from pellets.

[0070] When implementing the method of the present invention, any one of the three modes may be used, any two of the three modes may be used simultaneously, or all three modes may be used simultaneously. For example, only the low-frequency acoustic wave gas-guided wave mode may be used, or only the high-frequency acoustic wave gas-guided wave mode may be used, or both the low-frequency acoustic wave gas-guided wave mode and the high-frequency acoustic wave gas-guided wave mode may be used simultaneously, or both the low-frequency acoustic wave gas-guided wave mode and the high-frequency acoustic wave solid-guided wave mode may be used simultaneously, or both the high-frequency acoustic wave gas-guided wave mode and the high-frequency acoustic wave solid-guided wave mode may be used simultaneously, or both the low-frequency acoustic wave gas-guided wave mode, the high-frequency acoustic wave gas-guided wave mode, and the high-frequency acoustic wave solid-guided wave mode may be used simultaneously.

[0071] The mechanism of action of the low-frequency acoustic gas guided wave mode on the impurities on the surface of the pellets is as follows: the low-frequency acoustic waves in this mode can cause acoustic fatigue on the binding force between the impurities on the pellet surface and the pellets. The intensity of the acoustic wave is called the acoustic energy flux density, and the intensity of the acoustic wave is proportional to the square of the acoustic wave amplitude. Under the action of low-frequency acoustic waves with a certain acoustic energy flux density, the binding force between the impurities on the pellets and the pellets can be greatly weakened, and even the binding force can be close to zero, so that gaps or separations are generated in space between the pellets and the impurities, and the attached impurities are transformed into dispersed impurities.

[0072] The mechanism of action of the high-frequency acoustic wave gas guided wave mode on the impurity removal of granular materials is as follows: the high-frequency acoustic waves of this mode not only have the above-mentioned effectiveness of low-frequency acoustic waves, but also have strong penetrating power, which can greatly weaken the binding force between granular materials and impurities, so that granular materials and impurities are separated in space, and attached impurities are transformed into dispersed impurities.

[0073] The combination of low-frequency acoustic wave gas guide wave mode and high-frequency acoustic wave gas guide wave mode has the following mechanism of action on the impurity removal of granular materials: high-frequency acoustic waves are applied on the basis of low-frequency acoustic waves to strengthen the elimination of the binding force between the granular materials and impurities. The introduced high-frequency acoustic waves can further weaken the binding force, so that gaps are generated between the granular materials and the impurities on their surface and the gaps are enlarged, thereby enhancing the separation and cleaning effect.

[0074] The mechanism of action of the high-frequency acoustic wave solid waveguide mode on the granular material to be decontaminated is as follows: the wave energy of the high-frequency acoustic wave is transmitted to the solid waveguide medium, causing the solid waveguide medium to fluctuate with the high-frequency acoustic wave. The high-frequency acoustic wave acts directly on the granular material to be decontaminated in contact with it with the help of the solid waveguide medium, thereby producing a fatigue effect on the binding force between the granular material to be decontaminated flowing through the solid waveguide medium and the impurities, so that the binding force between the two is weakened or removed, and a gap or separation is generated between the impurities attached to the surface of the granular material and the granular material, thereby converting the attached impurities into dispersed impurities.

[0075] In one embodiment, at least two of the following modes are employed: a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode. The acoustic waves are transmitted to the pellets to be decontaminated, thereby further enhancing the removal of impurities. For example, any two of the three modes, or all three, may be employed simultaneously.

[0076] The inventors have found that the frequency, amplitude and waveform of the sound waves also affect the effect of weakening the binding force between the pellets and impurities. Therefore, when implementing the present invention, the frequency, amplitude and waveform of the sound waves in each mode can be determined according to actual needs.

[0077] In one embodiment, the low-frequency acoustic wave in the low-frequency acoustic wave gas-guided wave mode has a single frequency or a combination of multiple frequencies; the high-frequency acoustic wave in the high-frequency acoustic wave gas-guided wave mode has a single frequency or a combination of multiple frequencies; and the high-frequency acoustic wave in the high-frequency acoustic wave solid-guided wave mode has a single frequency or a combination of multiple frequencies. In other words, in each mode, a single acoustic wave frequency can be used, or multiple acoustic waves of different frequencies can be used simultaneously. For high-frequency acoustic waves, the higher the frequency, the greater their ability to penetrate the pellets.

[0078] Taking the low-frequency acoustic gas wave mode as an example, a single low-frequency acoustic wave can be used, or multiple low-frequency acoustic waves of varying frequencies can be employed simultaneously. When two or three modes are used simultaneously, multiple high-frequency acoustic waves of varying frequencies and multiple low-frequency acoustic waves of varying frequencies can be employed simultaneously. When combining high and low frequency acoustic waves, one of the different frequency bands can be primary, with the other serving as a secondary, or both can be primary, depending on the material's characteristics.

[0079] During the impurity removal process, the frequency of the sound wave can be fixed, adjustable, or even swept (with automatic frequency conversion). The frequency can be manually controlled or automatically adjusted.

[0080] In one embodiment, the amplitude of the low-frequency sound waves in the low-frequency acoustic gas-guided wave mode is a single amplitude or a combination of multiple amplitudes; the amplitude of the high-frequency sound waves in the high-frequency acoustic gas-guided wave mode is a single amplitude or a combination of multiple amplitudes; and the amplitude of the high-frequency sound waves in the high-frequency acoustic solid-guided wave mode is a single amplitude or a combination of multiple amplitudes. The amplitude of the sound waves in each mode is preferably such that the noise level at a distance of one meter from the device is less than or equal to 85 decibels (or otherwise meets local environmental protection requirements). When this condition is met, the higher the sound wave frequency, the better the effect of weakening the binding force between the pellets and impurities.

[0081] In one embodiment, the waveform of the low-frequency acoustic wave in the low-frequency acoustic wave gas-guided wave mode is a single waveform or a combination of multiple waveforms, the waveform of the high-frequency acoustic wave in the high-frequency acoustic wave gas-guided wave mode is a single waveform or a combination of multiple waveforms, and the waveform of the high-frequency acoustic wave in the high-frequency acoustic wave solid-guided wave mode is a single waveform or a combination of multiple waveforms. Available waveforms include sine waves, triangle waves, square waves, and pulse waves, and multiple waveforms may be used simultaneously during implementation.

[0082] Taking the high-frequency acoustic wave gas guided wave mode as an example, a single waveform of high-frequency acoustic wave can be used, or multiple waveforms of high-frequency acoustic wave can be used simultaneously. When two or three modes are used simultaneously, multiple waveforms of high-frequency acoustic wave and multiple waveforms of low-frequency acoustic wave can be used simultaneously.

[0083] According to the requirements of the cleanliness of the separation of granular impurities, when the separation cleanliness requirement is high, the three modes can be used in combination, and the amplitude can be adjusted to the limit of noise control, and a lower frequency of low-frequency sound waves (for example, 1Hz~20Hz) and a higher frequency of high-frequency sound waves (for example, 30kHz~40kHz) are used, and a single-frequency sine wave is used as much as possible; when the separation cleanliness requirement is low, the requirements can be lowered according to cost or other factors, and various combinations with one or two modes as the main mode, or an organic combination of waveform, mode and amplitude can be used; when the separation cleanliness requirement is extremely high, the sonication effect of the low-frequency sound wave solid guide wave mode can be added on the basis of the high-frequency sound wave solid guide wave mode to further exert and tap the potential of the sound wave.

[0084] In one embodiment, while the granular material to be cleaned is flowing, at least one of a low-frequency gas-guided acoustic wave mode, a high-frequency gas-guided acoustic wave mode, and a high-frequency solid-guided acoustic wave mode is used to transmit acoustic waves to the granular material to be cleaned. For example, a chamber is provided through which the granular material to be cleaned flows, and acoustic waves are introduced into the chamber. Because the granular material to be cleaned is in a flowing state rather than a static accumulation, the impurity removal effect can be further improved, and the wind and airflow can also facilitate the removal of impurities.

[0085] In one embodiment, the solid waveguide medium in the high-frequency acoustic wave solid waveguide mode is a thin film, a metal plate, or a plastic plate. Of course, it can also be any other solid material and form suitable for the corresponding working conditions. When used, multiple solid waveguide media can be used simultaneously. For example, the solid waveguide medium can be a slide plate, a distributor, and / or a fluidizing plate.

[0086] In the present invention, pellets are generally granular solid materials with a particle size between 0.8 mm and 20 mm, and may be spherical, oblong, square, cylindrical, teardrop-shaped, or other irregular shapes. Impurities are generally dust, fluff, silk, debris, water droplets, flakes, fragments, dust, liquid droplets, etc., which are mixed in the pellets. Dust, dust, and debris generally refer to particles with a particle size of less than 500 μm. The impurities may be made of the same material as the pellets or different materials. Impurities may be particles, silk, or fluff, and may be solid particles or liquid droplets.

[0087] Implementation Method 2

[0088] like Figure 1 As shown, the present invention also provides a device for removing impurities in granular materials, which is a device used in the method for removing impurities in granular materials in embodiment one. The device includes a shell 1 with a separation chamber 11 inside, and also includes at least one of a low-frequency sound wave generating device 2, a first high-frequency sound wave generating device 3 and a high-frequency sound wave solid waveguide component, and a blower for introducing an airflow Q into the separation chamber 11 and / or an induced draft fan for drawing out the airflow Q.

[0089] The working mode of the low-frequency sound wave generating device is the low-frequency sound wave gas guide wave mode described in the first embodiment, the working mode of the first high-frequency sound wave generating device is the high-frequency sound wave gas guide wave mode described in the first embodiment, and the working mode of the high-frequency sound wave solid guide wave assembly is the high-frequency sound wave solid guide wave mode described in the first embodiment. The low-frequency sound wave emitted by the low-frequency sound wave generating device 2 and the high-frequency sound wave emitted by the first high-frequency sound wave generating device 3 can use the gas in the separation chamber 11 as the waveguide medium to be transmitted to the granular material to be removed in the separation chamber 11, and the high-frequency sound wave solid The waveguide component includes a second high-frequency sound wave generating device 4 and a solid waveguide medium that are connected to each other. The solid waveguide medium needs to be set in the separation chamber 11 and located on the path that the granular material K1 to be removed from impurities must pass through. The high-frequency sound waves emitted by the second high-frequency sound wave generating device 4 use the solid waveguide medium as the waveguide medium and are transmitted to the granular material K1 to be removed from impurities in the separation chamber 11. The sound waves acting on the granular material K1 to be removed from impurities can weaken the binding force between the granular material and impurities. The airflow Q generated by the fan can blow the impurities away from the granular material, thereby completely separating the impurities and the granular material to obtain clean granular material K2.

[0090] In the present invention, the frequency of the low-frequency sound waves emitted by the low-frequency sound wave generating device 2 is 1Hz~350Hz, for example, 10Hz~350Hz, and the frequency of the high-frequency sound waves emitted by the first high-frequency sound wave generating device 3 and the second high-frequency sound wave generating device 4 is 6kHz~40kHz, for example, 9kHz and 12kHz.

[0091] When the device of the present invention is in use, only one of the low-frequency sound wave generating device 2, the first high-frequency sound wave generating device 3 and the high-frequency sound wave solid waveguide component can be turned on to use one mode of sound waves, or any two of them can be turned on at the same time to use any two modes of sound waves at the same time, or all three can be turned on at the same time to use three modes of sound waves at the same time.

[0092] The mechanism of action of the low-frequency sound wave generating device 2, the first high-frequency sound wave generating device 3 and the high-frequency sound wave solid waveguide component on the de-impurity granular material in the present invention is the same as the mechanism of action of the three modes in the first embodiment on the de-impurity granular material, so it will not be repeated.

[0093] In one embodiment, if Figure 1 As shown, the low-frequency sound wave generating device 2 includes a low-frequency sound wave generator 21 and a low-frequency sound wave converter 22 (or called a low-frequency sound wave transducer). The low-frequency sound wave converter 22 is used to receive the sound wave signal from the low-frequency sound wave generator 21 and convert it into a low-frequency sound wave. The low-frequency sound wave signal generated by the low-frequency sound wave generator 21 can be generated by electromagnetic oscillation, or by compressed air, mechanical vibration, piezoelectric materials, etc.

[0094] When electromagnetic oscillation is used to generate low-frequency sound wave signals, the low-frequency sound wave generator 21 is electrically connected to the low-frequency sound wave converter 22. When compressed air is used to generate low-frequency sound wave signals, the low-frequency sound wave generator 21 is connected to the low-frequency sound wave converter 22 through a pipe.

[0095] This embodiment can have various configurations, such as a low-frequency sound wave generator 21 connected to a low-frequency sound wave converter 22, a low-frequency sound wave generator 21 connected to multiple low-frequency sound wave converters 22, or a sound wave generator capable of emitting both low-frequency and high-frequency sound waves with one or more converters. The low-frequency sound wave generator 21 and the low-frequency sound wave converter 22 can be a single integrated device that combines the sound wave generation and sound wave conversion functions, or they can be separate devices that each have the sound wave generation and sound wave conversion functions.

[0096] In one embodiment, if Figure 1 As shown, the first high-frequency sound wave generating device 3 includes a first high-frequency sound wave generator 31 and a first high-frequency sound wave converter 32, and the second high-frequency sound wave generating device 4 includes a second high-frequency sound wave generator 41 and a second high-frequency sound wave converter 42. The first high-frequency sound wave generator 31 and the first high-frequency sound wave converter 32 are electrically connected, and the second high-frequency sound wave generator 41 and the second high-frequency sound wave converter 42 are electrically connected. The high-frequency sound wave converter is used to receive the sound wave signal from the high-frequency sound wave generator and convert it into a high-frequency sound wave. The high-frequency sound wave signal generated by the high-frequency sound wave generator can be generated by electromagnetic oscillation, or by compressed air, mechanical vibration, piezoelectric material, etc. The second high-frequency sound wave converter 42 of the second high-frequency sound wave generating device 4 is connected to the solid waveguide medium by a mechanical connection. The sound wave of the second high-frequency sound wave converter 42 is transmitted to the solid waveguide medium, causing the solid waveguide medium to generate mechanical vibration, and the mechanical vibration is then transmitted to the granular material K1 to be removed. For example, the low-frequency sound wave converter 22 and the first high-frequency sound wave converter 32 are both speakers, and the second high-frequency sound wave converter 42 is an electromagnetic oscillator or a pneumatic vibrator.

[0097] This embodiment can be implemented in a variety of configurations, such as a high-frequency sound wave generator connected to a high-frequency sound wave converter, a high-frequency sound wave generator connected to multiple high-frequency sound wave converters, or a sound wave generator capable of emitting both low-frequency and high-frequency sound waves connected to one or more converters. The high-frequency sound wave generator and high-frequency sound wave converter can be a single integrated device that combines the sound wave generation and sound wave conversion functions, or they can be separate devices that each have the sound wave generation and sound wave conversion functions.

[0098] In the present invention, the low-frequency sound wave generating device 2, the first high-frequency sound wave generating device 3 and the second high-frequency sound wave generating device 4 can be arranged outside the shell 1, or can be arranged inside the separation chamber 11. Of course, they can also be partially arranged outside the shell 1 and the other part arranged inside the separation chamber 11. For example, the sound wave generator is arranged outside the shell 1, and the sound wave converter is arranged inside the separation chamber 11, so that the separation chamber 11 is filled with low-frequency sound waves and high-frequency sound waves with gas as the waveguide medium.

[0099] The frequencies of the sound waves emitted by the low-frequency sound wave generator 2, the first high-frequency sound wave generator 3, and the second high-frequency sound wave generator 4 of the present invention can be fixed, adjustable, or swept (i.e., automatically variable), and can be manually changed or automatically adjusted. The amplitude of the sound wave generator can be adjustable or fixed.

[0100] In the present invention, the low-frequency sound wave generator 21 and the low-frequency sound wave converter 22 of the low-frequency sound wave generating device 2 can be electric or gaseous, and can be integrated or separated; the first high-frequency sound wave generator 31 and the first high-frequency sound wave converter 32 of the first high-frequency sound wave generating device 3 can be electric or gaseous, and can be integrated or separated; the second high-frequency sound wave generator 41 and the second high-frequency sound wave converter 42 of the second high-frequency sound wave generating device 4 can be electric or gaseous, and can be integrated or separated.

[0101] In one embodiment, the outer shell 1 is provided with a pellet inlet 12 and a pellet outlet 13 respectively connected to the separation chamber 11. The separation chamber 11 is provided with a drainage device for guiding the pellets K1 to be decontaminated to flow in the separation chamber 11. The drainage device is arranged between the pellet inlet 12 and the pellet outlet 13. The pellets K1 to be decontaminated enter the separation chamber 11 from the pellet inlet 12. Under the drainage action of the drainage device, the pellets K1 to be decontaminated flows in a dispersed rather than accumulated state in the separation chamber 11, so as to improve the effect of sound waves and airflow on the pellets K1 to be decontaminated. After removing impurities, the clean pellets K2 leave the separation chamber 11 from the pellet outlet 13.

[0102] Regarding the drainage device, there are at least the following embodiments:

[0103] In one embodiment, if Figure 2 As shown, the drainage device includes a slide plate 6 for guiding the granular material K1 to be cleaned to slide down.

[0104] In another embodiment, the drainage device includes a fluidizing plate 7 for guiding the granular material K1 to be decontaminated to slide down.

[0105] In another embodiment, the drainage device includes a slide plate 6 and a fluidizing plate 7 for guiding the granular material K1 to be decontaminated to slide down, and the fluidizing plate 7 is located below the slide plate 6 .

[0106] In the first feasible technical solution, the slide 6 is an inverted V-shaped structure composed of two symmetrically arranged first slides 61 and second slides 62, that is, the first slide 61 and the second slide 62 are in an inclined state, the upper ends of the two are connected and the lower ends are spaced apart, the pellet inlet 12, the slide 6 and the pellet outlet 13 are arranged correspondingly from top to bottom, and the pellet inlet 12 is toward the upper end of the slide 6 so that the pellet K1 to be de-impured can fall to the upper end of the slide 6. The pellet K1 to be de-impured is divided into two parts from the upper end of the slide 6, and slides down along the first slide 61 and the second slide 62 respectively.

[0107] The working process is as follows: the granular material K1 to be removed from the granular material inlet 12 enters the separation chamber 11 and falls on the upper end of the slide 6, and then is divided into two parts and slides down along the first slide 61 and the second slide 62 respectively. At the same time, the sound waves from at least one of the low-frequency sound wave generating device 2, the first high-frequency sound wave generating device 3 and the high-frequency sound wave solid waveguide component act on the granular material K1 to be removed from the granular material, so that the binding force between the granular material and the impurities is weakened or even eliminated. At the same time, the airflow Q generated by the fan blows towards the granular material to be removed from the granular material, and the wind power airflow blows the impurities away from the granular material. The clean granular material K1 falls out from the granular material outlet 13, and the wind power airflow carries the solid impurities and is discharged from the separation chamber 11, thereby realizing the complete separation of impurities and granular material.

[0108] This solution can not only guide the granular material to be removed from the separation chamber 11 to slide downward by providing the first slide plate 61 and the second slide plate 62, but also prolong the time the granular material to be removed from the separation chamber 11 stays, thereby further improving the effect of removing impurities.

[0109] In this scheme, if Figure 2 As shown, the drainage device also includes two fluidizing plates 7, which are densely covered with air holes. The two fluidizing plates 7 are respectively located below the first slide 61 and below the second slide 62, and respectively face the first slide 61 and the second slide 62. The two fluidizing plates 7 are inclined from top to bottom toward each other, and the pellet outlet 13 is located between the lower ends of the two fluidizing plates 7. Therefore, the pellet K1 to be removed first slides downward along the first slide 61 and the second slide 62, then falls onto the two fluidizing plates 7, and then slides along the two fluidizing plates 7 to the pellet outlet 13, and the clean pellet K2 falls out from the pellet outlet 13.

[0110] In this embodiment, at least one of the slide plate 6 and the fluidizing plate 7 is connected to the second high-frequency sound wave generator 4 as a solid waveguide. Therefore, in addition to guiding the pellets to slide, the slide plate 6 and / or the fluidizing plate 7 also transmits the sound waves to the pellets to be cleaned. Furthermore, the fluidizing plate 7 also serves as a material collecting device, converging the clean pellets.

[0111] The overall shape of the first slide plate 61 can be a flat plate (such as Figure 2As shown), it can also be a concave curved plate (as shown Figure 6 、 Figure 7 、 Figure 14 、 Figure 15 As shown), it can also be a convex curved plate (as shown Figure 10 、 Figure 11 As shown), the overall shape of the second slide plate 62 can be a flat plate (as shown Figure 2 As shown), it can also be a concave curved plate (as shown Figure 6 、 Figure 7 、 Figure 14 、 Figure 15 As shown), it can also be a convex curved plate (as shown Figure 10 、 Figure 11 shown).

[0112] Further, if Figure 2 、 Figure 3 、 Figure 4 As shown, the first slide 61 and the second slide 62 have the same structure, both of which are stepped plate structures. Taking the first slide 61 as an example, the first slide 61 is composed of a plurality of vertical plates 611 and a plurality of inclined plates 612 that are alternately arranged and connected in sequence. The angle between the inclined plates 612 and the vertical plates 611 is greater than 90° and less than 180°. The vertical plates 611 enable the granular material K1 to be removed to fall quickly, and play a flow acceleration role on the granular material K1 to be removed. When the granular material K1 to be removed falls to the inclined plates 612, it vibrates, which is helpful for separating impurities and granular materials. The inclined plates 612 guide the granular material K1 to be removed to slide downward.

[0113] Furthermore, Figure 5 As shown, the vertical plate 611 is densely covered with through holes 613 for airflow to pass through.

[0114] In a second feasible technical solution, the slide plate 6 is roughly a C-shaped plate (such as Figure 20 、 Figure 21 As shown), both ends of the slide plate 6 are fixed on the side walls of the housing 1.

[0115] In this solution, the structure of the slide plate 6 can be the same as the structure of the first slide plate 61 and the second slide plate 62 in the first solution, that is, a stepped plate structure.

[0116] In this embodiment, the drainage device may further include a fluidization plate 7 (such as Figure 20 、 Figure 21 As shown), the fluidizing plate 7 is located below the slide plate 6 and is used to receive the granular materials falling from the slide plate 6.

[0117] In the third feasible technical solution, the slide plate 6 is a substantially conical cone (such as Figure 8 、 Figure 9 、 Figure 12 、 Figure 13 、 Figure 16 、 Figure 17 As shown), the generatrix of the conical cylinder is an inward-concave arc (as shown Figure 8 、 Figure 9 、 Figure 16 、 Figure 17 ) or convex arcs (such as Figure 12 、 Figure 13 shown).

[0118] In this solution, the structure of the slide plate 6 can be the same as the structure of the first slide plate 61 and the second slide plate 62 in the first solution, that is, a stepped plate structure.

[0119] In this solution, the drainage device may further include two fluidizing plates 7 , which are located below the slide plate 6 and are used to receive the pellets falling from the slide plate 6 .

[0120] In the fourth feasible technical solution, the slide plate 6 is substantially an S-shaped plate (such as Figure 18 、 Figure 19 shown), similar to a curved slide.

[0121] In this solution, the structure of the slide plate 6 can be the same as the structure of the first slide plate 61 and the second slide plate 62 in the first solution, that is, a stepped plate structure.

[0122] In this solution, the drainage device may further include a fluidizing plate 7, which is located below the slide plate 6 and is used to receive the pellets falling from the slide plate 6. In a fifth feasible technical solution, the slide plate 6 is a hemispherical plate, and the pellets to be cleaned slide along the spherical surface of the hemispherical plate.

[0123] In a sixth feasible technical solution, the slide plate 6 is a semi-ellipsoidal plate, and the granular materials to be removed slide down along the ellipsoidal surface of the semi-ellipsoidal plate.

[0124] However, the present invention is not limited to this. In other embodiments, the drainage device may also include one or more combinations of acceleration plates, screen plates, screens, ventilation plates, distributors, blowpipes, injection pipes, centrifugal devices, discharge holes and cyclones, as long as the granular materials to be removed can be dispersed to avoid accumulation.

[0125] In one embodiment, if Figure 2 As shown, a distributor 5 is provided at the granular material inlet 12, and the distributor 5 spreads the granular material K1 to be cleaned on the drainage device so that the granular material K1 to be cleaned is dispersed on the drainage device, and the distribution method (such as uniformity, retention, etc.) is adjustable.

[0126] Regarding the fabric method, define a fabric reference line O, and you can fabricate on one side of the fabric reference line O (such as Figure 20 、 Figure 21As shown), you can also make cloth on both sides of the cloth reference line O (as shown Figure 23 、 Figure 24 As shown), you can also cloth in the direction around the cloth reference line O (as shown Figure 25 、 Figure 26 、 Figure 28 shown).

[0127] Regarding the distributor 5, there are at least the following embodiments:

[0128] In the first specific embodiment, the pellet inlet 12, the distributor 5, the drainage device and the pellet outlet 13 are all arranged on one side of the distribution reference line O, the distribution reference line O is located on the side wall of the shell 1, the distributor 5 is a straight tube (not shown), an inclined plate (such as Figure 29 As shown), or the distributor 5 is an inclined shell that tilts from top to bottom away from the distribution reference line O (as shown Figure 21 、 Figure 22 shown), in Figure 21 and Figure 22 In the example, the cross section of the inclined shell is rectangular. The fabric distribution method of this embodiment is single-sided fabric distribution, which is suitable for use in combination with the drainage device of the second technical solution or the drainage device of the fourth technical solution.

[0129] In this embodiment, the drainage device may include a slide plate 6 (such as Figure 20 、 Figure 21 As shown), the slide plate 6 may not be included (as shown Figure 29 As shown), it may include a fluidizing plate 7 (as Figure 20 、 Figure 21 、 Figure 29 ), the fluidizing plate 7 may not be included.

[0130] In the second specific embodiment, Figures 23 to 27 As shown, the fabric reference line O is the center line of the shell 1, and the fabric reference line O is the symmetry axis of the drainage device. The fabric method of this embodiment is to spread the fabric on both sides or in the surrounding direction of the fabric reference line O, which is suitable for use in combination with the drainage device of the first technical solution or the drainage device of the third technical solution.

[0131] In the first feasible technical solution of this embodiment, as Figure 23 、 Figure 24 As shown, the material distributor 5 includes two feeders 51, located on opposite sides of the material distribution reference line O. The feeders 51 have rectangular cross-sections and are inclined away from each other as they approach the drainage device. The lower outlets of the two feeders 51 are rectangular slits. The granular material K1 to be cleaned flows out of the two feeders 51 and falls onto the drainage device. This material distribution method can be called a multi-slit material distribution method.

[0132] In this embodiment, the drainage device may include a slide plate 6 (such as Figure 23 As shown), the slide plate 6 may not be included (as shown Figure 31 、 Figure 32 As shown), it may include a fluidizing plate 7 (as Figure 23 、 Figure 31 ), the fluidizing plate 7 may not be included.

[0133] In the second feasible technical solution of this embodiment, as Figure 25 As shown, the distributor 5 is a conical tube, and the distribution reference line O is the central axis of the conical tube. In the direction close to the drainage device, the diameter of the main body of the conical tube gradually decreases, while the diameter of the outlet of the conical tube gradually expands. Of course, the entire conical tube can also gradually expand from top to bottom (such as Figure 30 As shown), the impurity-free granular material K1 flows through the conical cylinder and then falls on the drainage device. The distribution method of this solution can be called a conical distribution method.

[0134] In this embodiment, the drainage device may include a slide plate 6 (such as Figure 25 As shown), the slide plate 6 may not be included (as shown Figure 30 As shown), it may include a fluidizing plate 7 (as Figure 25 、 Figure 30 ), the fluidizing plate 7 may not be included.

[0135] In the third feasible technical solution of this embodiment, as Figure 26 、 Figure 27 As shown, the distributor 5 consists of two concentric cones spaced apart from each other. The distribution reference line O is the central axis of the two cones. The diameters of the two cones gradually increase as they approach the drainage device. The gap between the two cones is an annular gap. The impurity-removed granular material K1 flows through the annular gap between the two cones and then falls onto the drainage device. This distribution method can be called an annular distribution method.

[0136] In this embodiment, the drainage device may include a slide plate 6 (such as Figure 26 As shown), the slide plate 6 may not be included (as shown Figure 33 、 Figure 34 As shown), it may include a fluidizing plate 7 (as Figure 26 、 Figure 33 ), the fluidizing plate 7 may not be included.

[0137] In the above three technical solutions of this embodiment, the pellet inlet 12 is located above the drainage device, that is, the distributor 5 is located above the drainage device, and the "direction close to the drainage device" mentioned above is the direction from top to bottom.

[0138] In the above embodiments, when the slide plate 6 is not provided, the second high-frequency sound wave converter 42 can be provided on the distributor 5 (eg Figures 29 to 34 shown).

[0139] However, the present invention is not limited thereto, and the second high-frequency sound wave generating device may also be connected to other solid substances in contact with the particles in the separation chamber 11 .

[0140] In the third specific embodiment, Figure 28 As shown, the distribution reference line O is the centerline of the housing 1. The drainage device includes a slide 6, with the distribution reference line O being the axis of symmetry of the slide 6. The pellet inlet 12 is located below the slide 6 and to one side of the distribution reference line O. The distributor 5 is a curved pipe extending from the pellet inlet 12 toward an angled position above and near the distribution reference line O. After reaching the bottom center of the slide 6, the curved pipe then passes upward through the slide 6 along the distribution reference line O and extends to the top of the slide 6. The decontaminated pellets K1 flow upward within the curved pipe, exit the curved pipe, fall to the top of the slide 6, and then slide downward along the slide 6. The distribution method of this embodiment can be referred to as an elutriation distribution method. In this embodiment, the slide 6 can be a conical cylinder, a hemispherical plate, or a semi-ellipsoidal plate. The drainage device does not need to include the fluidizing plate 7, but instead relies on the inverted conical inner wall of the lower portion of the housing 1 to guide the pellets to the pellet outlet 13.

[0141] In one embodiment, a collecting device for collecting the clean granular materials K2 is further provided at the granular material outlet 13, so that the clean granular materials K2 are collected and then flow out from the granular material outlet 13. For example, the collecting device is a funnel-shaped structure.

[0142] In one embodiment, the outer shell 1 is provided with an air inlet 14 and an air outlet 15 respectively connected to the separation chamber 11, and a fan is provided at the air inlet 14 and / or the air outlet 15, that is, a blower / air supply fan is provided at the air inlet 14, and / or an induced draft fan is provided at the air outlet 15, and the air flow can carry impurities and be discharged from the air outlet 15.

[0143] Further, if Figure 1 As shown, valves 8 are provided at the pellet inlet 12, the pellet outlet 13, the air inlet 14 and the air outlet 15 for easy operation and control.

[0144] The method and device of the present invention utilize the characteristics of different frequency bands of sound waves, organically combine low-frequency sound waves with high-frequency sound waves, and organically combine gas-guided waves with solid-guided waves, so as to weaken or even eliminate the binding force between granular materials and impurities attached to their surfaces, so that a gap or separation effect is generated between the two. With the help of the provided wind power and airflow, the particles and impurities whose binding force has been eliminated are further separated and sent to the downstream respectively, thereby realizing efficient separation of granular materials and impurities and achieving the purpose of deep purification of granular materials.

[0145] The present invention solves the difficulties and key points of pellet cleaning, that is, it converts adhered impurities attached to the surface of the particles due to binding forces such as electromagnetic force, liquid bridge force, and van der Waals force into dispersed impurities, thereby effectively separating the adhered impurities and achieving a qualitative leap in the cleaning efficiency of the pellets. Tests have shown that under the same other working conditions, the adoption of the present invention can increase the pellet cleanliness value by an average of more than 10 PPM. The present invention has low investment cost, is safe and reliable, environmentally friendly, operates stably, and is easy to implement. It is easy to transform and upgrade equipment with backward technology and low cleaning efficiency, with relatively small investment and significant effect.

[0146] The method and device of the present invention can be combined with other methods for removing the binding force or separation of particulate matter and impurities, such as electromagnetic field, ion wind, sieve plate, fluidized bed, impact plate, elutriator, blowing, electrostatic, mechanical, screen and other methods or devices for removing impurities.

[0147] The method and device of the present invention achieve the separation of granular materials and impurities. In other words, it also achieves the collection of impurities such as powder or microparticles, which is equivalent to removing larger particles in the powder or microparticles.

[0148] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention. It should also be noted that the various components of the present invention are not limited to the above-mentioned overall application. The various technical features described in the specification of the present invention can be selected for use alone or in combination according to actual needs. Therefore, the present invention naturally covers other combinations and specific applications related to the invention point of this case.

Claims

1. A device for removing impurities from pellets, characterized in that: The device is a device used in a method for removing impurities from granular materials; The method for removing impurities from granular materials comprises: using at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode to transmit acoustic waves to the granular materials to be decontaminated, thereby weakening the binding force between the granular materials and impurities in the granular materials to be decontaminated, and simultaneously using airflow to strengthen the separation of the impurities and the granular materials; wherein: the low-frequency acoustic wave gas-guided wave mode is a mode in which low-frequency acoustic waves are transmitted using gas as a waveguide medium; the high-frequency acoustic wave gas-guided wave mode is a mode in which high-frequency acoustic waves are transmitted using gas as a waveguide medium; and the high-frequency acoustic wave solid-guided wave mode is a mode in which high-frequency acoustic waves are transmitted using solid as a waveguide medium; The device for removing impurities from granular material comprises a housing having a separation chamber and a blower for introducing an airflow into the separation chamber and / or an induced draft fan for leading out an airflow, the device further comprising a low-frequency sound wave generating device, a first high-frequency sound wave generating device and a high-frequency sound wave solid waveguide component, the working mode of the low-frequency sound wave generating device is the low-frequency sound wave gas guide mode, the working mode of the first high-frequency sound wave generating device is the high-frequency sound wave gas guide mode, the working mode of the high-frequency sound wave solid waveguide component is the high-frequency sound wave solid guide mode, and the high-frequency sound wave solid waveguide component comprises a second high-frequency sound wave generating device and a solid waveguide medium connected thereto; The housing is provided with a pellet inlet and a pellet outlet respectively connected to the separation chamber. The separation chamber is provided with a drainage device for guiding the pellets to be decontaminated to flow in a dispersed manner in the separation chamber. The drainage device is arranged between the pellet inlet and the pellet outlet. The drainage device includes a slide for guiding the pellets to be decontaminated to slide down and two fluidizing plates, and the fluidizing plates are located below the slide. At least one of the slide and the fluidizing plates serves as the solid wave-guiding medium. The slide plate is an inverted V-shaped structure formed by connecting two symmetrically arranged first slide plates and a second slide plate. The first slide plate and the second slide plate are both composed of a plurality of vertical plates and a plurality of inclined plates that are alternately arranged and connected in sequence. The vertical plates are densely covered with through holes. The two fluidizing plates are inclined from top to bottom toward each other, and the fluidizing plates are densely covered with air holes.

2. The device for removing impurities from granular materials according to claim 1, characterized in that: At least a portion of the drainage device serves as the solid waveguide medium and is connected to the second high-frequency sound wave generating device.

3. The device for removing impurities from granular materials according to claim 1, characterized in that: The device further comprises a distributor arranged at the granular material inlet, and the distributor distributes the granular material to be cleaned onto the drainage device.

4. The device for removing impurities from granular materials according to claim 3, characterized in that: The distributor serves as the solid waveguide medium and is connected to the second high-frequency sound wave generating device.

5. The device for removing impurities from granular materials according to claim 1, characterized in that: The method adopts at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode to transmit the acoustic wave to the granular material to be decontaminated, including: At least two modes among a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode and a high-frequency acoustic wave solid-guided wave mode are adopted to transmit the acoustic wave to the granular material to be removed.

6. The device for removing impurities from granular materials according to claim 1, characterized in that: The frequency of the low-frequency acoustic wave in the low-frequency acoustic wave gas guided wave mode is one frequency or a combination of multiple frequencies; The frequency of the high-frequency sound wave in the high-frequency sound wave gas guided wave mode is one frequency or a combination of multiple frequencies; The frequency of the high-frequency sound wave in the high-frequency sound wave solid guided wave mode is one frequency or a combination of multiple frequencies.

7. The device for removing impurities from granular materials according to claim 1, characterized in that: The waveform of the low-frequency sound wave in the low-frequency sound wave gas guided wave mode is one waveform or a combination of multiple waveforms; The waveform of the high-frequency sound wave in the high-frequency sound wave gas guided wave mode is one waveform or a combination of multiple waveforms; The waveform of the high-frequency sound wave in the high-frequency sound wave solid guided wave mode is one waveform or a combination of multiple waveforms.

8. The device for removing impurities from granular materials according to claim 1, characterized in that: The amplitude of the low-frequency sound wave in the low-frequency sound wave gas guided wave mode is one amplitude or a combination of multiple amplitudes; The amplitude of the high-frequency sound wave in the high-frequency sound wave gas guided wave mode is one amplitude or a combination of multiple amplitudes; The amplitude of the high-frequency sound wave in the high-frequency sound wave solid guided wave mode is one amplitude or a combination of multiple amplitudes.

9. The device for removing impurities from granular materials according to any one of claims 1 to 8, characterized in that: The frequency of the low-frequency sound wave is 1 Hz to 350 Hz, and the frequency of the high-frequency sound wave is 6 kHz to 40 kHz.

10. The device for removing impurities from granular materials according to any one of claims 1 to 8, characterized in that: The method adopts at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode, and a high-frequency acoustic wave solid-guided wave mode to transmit the acoustic wave to the granular material to be decontaminated, including: When the granular material to be removed is flowing, at least one of a low-frequency acoustic wave gas-guided wave mode, a high-frequency acoustic wave gas-guided wave mode and a high-frequency acoustic wave solid-guided wave mode is adopted to transmit the acoustic wave to the granular material to be removed.

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