Feeding device for aluminum nitride powder

Abstract

The invention relates to the technical field of feeding devices, and discloses a feeding device for aluminum nitride powder.The feeding device comprises an annular cavity, an air inlet pipeline is fixedly installed on one side of the annular cavity in a penetrating mode, and according to the feeding device for the aluminum nitride powder, by arranging air blowing equipment, a raw material storage bin containing aluminum nitride powder raw materials is arranged above the air blowing equipment; the aluminum nitride powder is conveyed into the air inlet pipeline through the conveying pipeline, the falling aluminum nitride powder raw material is carried by high-speed airflow generated by the air blowing equipment to rapidly flow towards the interior of the annular cavity, and the aluminum nitride powder is crushed by impacting the first crushing cutter and the second crushing cutter after entering the annular cavity; and the first crushing cutters and the second crushing cutters are arranged at intervals in a staggered manner, so that air flow can quickly flow between the adjacent first crushing cutters or second crushing cutters when the first crushing cutters and the second crushing cutters are staggered, the resistance of the air flow can be increased when the first crushing cutters and the second crushing cutters coincide, and the aluminum nitride powder can be more effectively impacted on the first crushing cutters and the second crushing cutters to be crushed.

Description

Technical Field

[0001] The invention relates to the technical field of feeding devices, in particular to a feeding device for aluminum nitride powder. Background Art

[0002] Aluminum nitride is a compound with high thermal conductivity, high temperature insulation and good dielectric properties. It has good thermal, electrical and mechanical properties and is an ideal heat dissipation material for electronic packaging. It is also commonly used in high temperature structural parts and crucibles and casting mold materials for metal smelting. These tools need to be quantitatively loaded with aluminum nitride during production, and then undergo preliminary pressing before subsequent processing. However, since aluminum nitride powder is easy to agglomerate, the subsequent material pressing process will result in a decrease in product quality due to the presence of agglomerates. The existing aluminum nitride feeding device also has some problems in use, as follows:

[0003] The existing feeding device is unable to crush and separate the agglomerated aluminum nitride well, which results in a large number of lumps mixed in the aluminum nitride raw material. At the same time, it is also unable to dry the aluminum nitride powder after the agglomerates are crushed, resulting in the humidity of the powder being difficult to meet the specified requirements, which will also affect the pressing effect of the finished product. Although the existing feeding device will add crushing structures such as grinding rollers to achieve the crushing effect, a large amount of powder will remain on the grinding rollers and the conveying device, resulting in the powder sticking and accumulating to form cake-shaped lumps. These lumps will not only affect the subsequent grinding and crushing, but also increase the number of lumps. For this reason, we propose a feeding device for aluminum nitride powder. Summary of the invention

[0004] The present invention provides a feeding device for aluminum nitride powder, which has the advantage of good raw material pre-treatment effect and solves the problems raised in the above background technology.

[0005] The present invention provides the following technical scheme: a feeding device for aluminum nitride powder comprises an annular chamber, an air inlet pipe is fixedly installed on one side of the annular chamber, an air blast device is fixedly installed on the end of the air inlet pipe, a raw material storage bin is fixedly installed on the top of the air inlet pipe, a branch air inlet pipe is fixedly installed on the bottom end of the air blast device, an annular air cavity is fixedly installed on the bottom end of the annular chamber, an air outlet guide cavity is fixedly installed on the top of the annular chamber, an air outlet ring is fixedly installed on the middle part of the annular chamber, a discharge chamber is fixedly installed on the bottom end of the annular chamber, a collection chamber is fixedly installed on the bottom end of the discharge chamber, a lower discharge assembly is fixedly installed on the bottom end of the collection chamber, a support leg is fixedly installed on the bottom end of the collection chamber, a support ring is fixedly installed on the center of the air outlet ring, a drive motor is fixedly installed in the support ring, a rotating assembly is fixedly installed on the output shaft of the drive motor, an inner rotating assembly is movably installed inside the annular chamber, a transmission assembly is movably installed on the inner rotating assembly, and a second crushing knife is fixedly installed inside the annular chamber;

[0006] The lower discharge assembly comprises a discharge pipe, both sides of which are provided with exhaust grooves, and a baffle is fixedly installed inside the discharge pipe;

[0007] The rotating assembly comprises a base plate, a driving ring is fixedly mounted on the base plate, a connecting rod is fixedly mounted on the bottom end of the base plate, a material guide table is fixedly mounted on the bottom end of the connecting rod, a bottom ring is fixedly mounted on the bottom end of the material guide table, and a scraper rod is fixedly mounted on the bottom ring;

[0008] The transmission assembly comprises a center seat and an external gear, the center seat is provided with an inner groove, a telescopic rod is movably installed inside the inner groove, and a top plate is movably installed in the inner groove;

[0009] The inner rotating component comprises a base ring, a sealing plate is fixedly mounted on the top of the base ring, a first crushing knife is fixedly mounted on the outer side of the base ring, and a wind resistance plate is fixedly mounted on the outer side of the base ring.

[0010] In a preferred embodiment, the end of the branch air inlet pipe is fixedly connected to the annular air cavity, the annular air cavity is sealed and fixedly installed at the bottom end of the annular chamber, and the bottom end of the raw material storage bin is connected to the air inlet pipe through a feed pipe.

[0011] In a preferred embodiment, an air outlet grid is provided at the top of the annular air cavity, and the air outlet grid is offset from the second crushing knife, the air outlet guide cavity is through-connected with the top of the air outlet ring, and the bottom end of the air outlet ring is sealed and through-connected with the interior of the collecting chamber through an extension pipe.

[0012] In a preferred embodiment, the discharge chamber is connected to the top of the collecting chamber, a filter is provided at the top of the discharge chamber, and the air outlet grid on the annular air cavity is opened at a position after the air outlet guide cavity in the annular flow direction of the air flow.

[0013] In a preferred embodiment, the discharge pipe is of a trapezoidal structure and has a larger cross-sectional area at the bottom end. The exhaust grooves are opened on the inclined surfaces on both sides of the discharge pipe, and the baffle is fixedly installed downward above each exhaust groove.

[0014] In a preferred embodiment, a through groove is provided on the base plate, a plurality of racks of the same length are evenly arranged on the upper surface of the drive ring, the drive ring is meshed with the transmission assembly, and the drive ring is arranged inside the air outlet ring.

[0015] In a preferred embodiment, the material guide platform is rotatably arranged inside the material collection chamber. The material guide platform is in the shape of a cone with a small upper part and a large lower part. The bottom end diameter of the material guide platform is half of the inner diameter of the material collection chamber. The bottom ring is the same size as the bottom of the material guide platform, and the bottom end of the scraper rod is slidably arranged in contact with the bottom end of the inner part of the material collection chamber.

[0016] In a preferred embodiment, the center seat is fixedly installed with one end of the inner rotating component, the inner ring surface of the outer gear is evenly provided with arc grooves, the inner ring surface of the outer gear is slidably arranged in contact with the outer surface of the center seat, a spring is arranged inside the telescopic rod, the two ends of the telescopic rod are respectively hinged to the embedded groove and the top plate, and the outer gear is meshed with the drive ring.

[0017] In a preferred embodiment, the base ring is rotatably arranged inside the annular chamber, one end of the sealing plate is aligned with the first crushing knife, the first crushing knife and the second crushing knife are alternately and superimposedly arranged, and the end of the first crushing knife at the bottom facing the airflow flow inside the annular chamber is fixedly connected to the transmission assembly and can be rotatably arranged.

[0018] The present invention has the following beneficial effects:

[0019] 1. The feeding device for aluminum nitride powder is provided with a blasting device, and a raw material storage bin containing aluminum nitride powder raw materials is placed above the raw material storage bin, which is fed into the air intake pipe through a conveying pipe, and the high-speed airflow generated by the blasting device carries the fallen aluminum nitride powder raw materials to flow rapidly toward the inside of the annular chamber. After entering the inside of the annular chamber, the aluminum nitride powder is crushed by impacting the first crushing knife and the second crushing knife, and the first crushing knife and the second crushing knife are arranged at staggered intervals, so that when the two are staggered, the airflow can quickly flow between the adjacent first crushing knife or the second crushing knife, and when the two overlap, the resistance of the airflow will increase, so that the aluminum nitride powder can more effectively impact on the two to be crushed, which greatly improves the crushing effect of the feeding device on the agglomerates in the raw materials, and at the same time, the carrying effect of the airflow can also remove the moisture in the aluminum nitride powder at the same time, thus ensuring the quality of the subsequent finished products.

[0020] 2. The feeding device for aluminum nitride powder is provided with a rotating component at the center position of the air outlet ring, and a transmission component is installed at one end of the lowest end of the first crushing knife at the center position of the second crushing knife, so that the transmission component can rotate during use, and then the first crushing knife at the lowest end will be driven to rotate during the rotation, so that one end of the first crushing knife fits the upper surface of the annular air cavity to scrape up and push the aluminum nitride powder deposited on the bottom, and also scoops up the aluminum nitride agglomerates that have not been completely crushed, and are blown up after reaching the air outlet grid position on the annular air cavity, and are impacted and crushed again by the simultaneously flowing annular airflow, and so on, so as to minimize the occupied space of the equipment and greatly improve the crushing effect. In this way, when there is no need to scoop up the aluminum nitride deposited on the bottom, the first crushing knife is arranged horizontally to reduce the wind resistance, and the overall wind resistance of the inner rotating assembly is increased and the rotation speed is too fast, so as to ensure the crushing effect of the aluminum nitride agglomerates. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the first three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the second three-dimensional structure of the present invention;

[0023] Figure 3 It is a partial cross-sectional structural schematic diagram of the present invention;

[0024] Figure 4 It is a schematic diagram of a first partial three-dimensional structure of the present invention;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the inner rotating assembly of the present invention;

[0026] Figure 6 It is a schematic cross-sectional view of the transmission assembly of the present invention;

[0027] Figure 7 It is a schematic diagram of a second partial three-dimensional structure of the present invention;

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the connection between the rotating assembly and its support ring and the driving motor of the present invention;

[0029] Fig. 9 It is a schematic diagram of the three-dimensional structure of the lower discharge assembly of the present invention.

[0030] In the figure: 1, annular chamber; 2, air inlet pipe; 3, blasting equipment; 4, raw material storage bin; 5, branch air inlet pipe; 6, annular air cavity; 7, air outlet guide cavity; 8, air outlet ring; 9, discharge chamber; 10, collection chamber; 11, lower discharge assembly; 111, discharge pipe; 112, exhaust groove; 113, baffle; 12, support leg; 13, support ring; 14, drive motor; 15, rotating assembly; 151 , base plate; 152, drive ring; 153, connecting rod; 154, material guide table; 155, bottom ring; 156, scraper rod; 16, transmission assembly; 161, center seat; 162, external gear; 163, embedded groove; 164, telescopic rod; 165, top plate; 17, inner rotating assembly; 171, base ring; 172, sealing plate; 173, first crushing knife; 174, wind resistance plate; 18, second crushing knife. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative, and the feeding device for aluminum nitride powder involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0032] See also Figure 1-7A feeding device for aluminum nitride powder comprises an annular chamber 1, an air inlet pipe 2 is fixedly installed on one side of the annular chamber 1, a blast device 3 is fixedly installed on the end of the air inlet pipe 2, a raw material storage bin 4 is fixedly installed on the top of the air inlet pipe 2, a branch air inlet pipe 5 is fixedly installed on the bottom end of the blast device 3, an annular air cavity 6 is fixedly installed on the bottom end of the annular chamber 1, an air outlet guide cavity 7 is fixedly installed on the top end of the annular chamber 1, an air outlet ring 8 is fixedly installed in the middle of the annular chamber 1, a discharge chamber 9 is fixedly installed on the bottom end of the annular chamber 1, and a discharge chamber 9 is fixedly installed on the bottom end of the annular chamber 1. A collection chamber 10 is fixedly installed at the bottom end of the material chamber 9, a lower discharge assembly 11 is fixedly installed at the bottom end of the collection chamber 10, a support leg 12 is fixedly installed at the bottom end of the collection chamber 10, a support ring 13 is fixedly installed at the center of the outlet ring 8, a drive motor 14 is fixedly installed in the support ring 13, a rotating assembly 15 is fixedly installed on the output shaft of the drive motor 14, an inner rotating assembly 17 is movably installed inside the annular chamber 1, a transmission assembly 16 is movably installed on the inner rotating assembly 17, and a second crushing knife 18 is fixedly installed inside the annular chamber 1;

[0033] Compared with the prior art, the present application is provided with a blasting device 3, and a raw material storage bin 4 containing aluminum nitride powder raw material is placed above it, and is sent into the air intake pipe 2 through a conveying pipe, and the high-speed airflow generated by the blasting device 3 carries the fallen aluminum nitride powder raw material to flow quickly toward the inside of the annular chamber 1. After entering the inside of the annular chamber 1, the aluminum nitride powder will be crushed by impacting the first crushing knife 173 and the second crushing knife 18, and the first crushing knife 173 and the second crushing knife 18 are arranged at staggered intervals, so that when the two are staggered, the airflow can quickly flow between the adjacent first crushing knife 173 or the second crushing knife 18, and when the two overlap, the resistance of the airflow will increase, which can also make the aluminum nitride powder more effectively impact on the two for crushing, greatly improving the crushing effect of the feeding device on the agglomerates in the raw material, and at the same time, the carrying effect of the airflow can also remove the moisture in the aluminum nitride powder at the same time, thus ensuring the quality of the subsequent finished product. At the same time, a rotating component 15 is arranged at the center position of the air outlet ring 8, and a transmission component 16 is installed at one end of the lowest end of the first crushing knife 173 at the center position of the second crushing knife 18, so that the transmission component 16 can rotate during use, and then drive the first crushing knife 173 at the lowest end to rotate during the rotation, so that one end of it fits the upper surface of the annular air cavity 6 to scrape up and push the aluminum nitride powder deposited at the bottom, and at the same time, the aluminum nitride agglomerates that have not been completely crushed are shoveled up, blown up after reaching the air outlet grid position on the annular air cavity 6, and combined with the simultaneously flowing annular airflow, they are impacted and crushed again, and so on and so forth, thereby minimizing the occupied space of the equipment and greatly improving the crushing effect. In this way, when there is no need to shovel up the aluminum nitride deposited at the bottom, the first crushing knife 173 is arranged horizontally to reduce the wind resistance, and the overall wind resistance of the inner rotating component 17 is prevented from increasing and the rotation speed is too fast, thereby ensuring the crushing effect of the aluminum nitride agglomerates.

[0034] See also Figure 1-4 A feeding device for aluminum nitride powder includes a branch air inlet pipe 5, the end of the branch air inlet pipe 5 is connected to the annular air cavity 6, the annular air cavity 6 is located at the bottom end of the annular chamber 1 and is sealed and fixedly installed, and the bottom end of the raw material storage bin 4 is connected to the air inlet pipe 2 through a feed pipe;

[0035] In this embodiment, it should be noted that the airflow generated by the blast device 3 can be used to drive the aluminum nitride raw material powder falling from the feed pipe. The powder will quickly enter the annular chamber 1 with the high-speed airflow, and then collide with the structure on the internal rotating component 17 and the second crushing knife 18, thereby crushing the agglomerated parts. At the same time, because it is driven by the airflow, the moisture in it can be quickly and effectively removed after crushing, thereby increasing the processing effect of the raw materials.

[0036] See also Figure 1-7A feeding device for aluminum nitride powder, comprising an annular air cavity 6, a gas outlet grid is provided at the top of the annular air cavity 6, and the gas outlet grid is staggered with the second crushing knife 18, the gas outlet guide cavity 7 is connected to the top of the gas outlet ring 8, and the bottom of the gas outlet ring 8 is connected to the inside of the collecting chamber 10 through an extension pipe;

[0037] In the present embodiment, it should be noted that the gas supplied by the blowing device 3 can be ejected from the outlet grid on the annular air cavity 6, so that the internal aluminum nitride powder and agglomerates can be sprayed up when passing through this place, and the airflow continuously entering from the air inlet pipe 2 drives them to move horizontally, so that the agglomerates will collide multiple times inside the annular chamber 1, thereby ensuring the crushing effect.

[0038] See also Figure 1-7 A feeding device for aluminum nitride powder, comprising a discharge chamber 9, the discharge chamber 9 is connected to the top of a collection chamber 10, a filter screen is arranged at the top of the discharge chamber 9, and an air outlet grid on the annular air cavity 6 is opened at a position after the air outlet guide cavity 7 in the annular flow direction of the air flow;

[0039] In the present embodiment, it should be noted that the thrust of the airflow on the internal agglomerates will gradually decrease as the flow path of the airflow in the annular chamber 1 increases. The airflow is relatively small at the location of the air outlet guide cavity 7, and the agglomerates at the location of the air outlet guide cavity 7 are basically settled to the upper surface of the annular air cavity 6. The gas will carry a small amount of powdered aluminum nitride and be discharged from the air outlet ring 8. When the airflow passes through the air outlet grid set at the position after the air outlet guide cavity 7, the agglomerates can be blown up again and pushed back to the air inlet position of the air inlet pipe 2 with the help of the airflow. In this way, the impact can be accelerated again at this position with the help of the airflow, thereby ensuring the crushing effect.

[0040] See also Figure 2-9 A feeding device for aluminum nitride powder includes a lower discharge assembly 11, the lower discharge assembly 11 includes a discharge pipe 111, exhaust grooves 112 are respectively provided on both sides of the discharge pipe 111, and a baffle 113 is fixedly installed inside the discharge pipe 111;

[0041] In the present embodiment, it should be noted that the discharge pipe 111 has a trapezoidal structure and a larger cross-sectional area at the bottom end, the exhaust grooves 112 are opened on the inclined surfaces on both sides of the discharge pipe 111, and the baffles 113 are fixedly installed downward above each exhaust groove 112, so that the crushed raw materials falling from above will enter the discharge pipe 111 driven by the airflow, and the baffles 113 can block the raw materials and make them flow downward. The design of a larger bottom opening reduces the speed of the airflow, making it easier for the gas to be discharged from the exhaust grooves 112.

[0042] See also Figure 3-8A feeding device for aluminum nitride powder includes a rotating assembly 15, the rotating assembly 15 includes a base plate 151, a driving ring 152 is fixedly mounted on the base plate 151, a connecting rod 153 is fixedly mounted on the bottom end of the base plate 151, a material guide table 154 is fixedly mounted on the bottom end of the connecting rod 153, a bottom ring 155 is fixedly mounted on the bottom end of the material guide table 154, and a scraper rod 156 is fixedly mounted on the bottom ring 155;

[0043] In this embodiment, it should be noted that a through groove is provided on the substrate 151, a plurality of racks of the same length are evenly arranged on the upper surface of the drive ring 152, the drive ring 152 is meshed with the transmission assembly 16, the drive ring 152 is arranged inside the air outlet ring 8, the guide table 154 is arranged to rotate inside the collection chamber 10, the guide table 154 is a round cone-shaped structure with a small top and a large bottom, the bottom end diameter of the guide table 154 is half of the inner diameter of the collection chamber 10, the bottom ring 155 is the same size as the bottom of the guide table 154, and the bottom end of the scraper rod 156 is in contact with the collection chamber 10. The bottom end of the chamber 10 is slidingly arranged, so that the engagement of the drive ring 152 and the transmission assembly 16 can be used to drive it to rotate, so that the second crushing knife 18 inside can rotate intermittently, so that the raw materials deposited above the annular air cavity 6 can be continuously driven to the air outlet grid to be blown up for crushing. After crushing, the guide table 154 can be used to guide the raw materials discharged from the air outlet ring 8 to the side, thereby ensuring that the scraper rod 156 can fully push the raw materials to the position of the lower discharge assembly 11 during the rotation process for discharge and subsequent loading.

[0044] See also Figure 4-6 A feeding device for aluminum nitride powder includes a transmission assembly 16, the transmission assembly 16 includes a center seat 161 and an external gear 162, the center seat 161 is provided with an embedded groove 163, a telescopic rod 164 is movably installed inside the embedded groove 163, and a top plate 165 is movably installed in the embedded groove 163;

[0045] In this embodiment, it should be noted that the center seat 161 is fixedly installed with one end of the inner rotating component 17, the inner ring surface of the outer gear 162 is evenly provided with arc grooves, the inner ring surface of the outer gear 162 is slidingly arranged in contact with the outer surface of the center seat 161, a spring is arranged inside the telescopic rod 164, and the two ends of the telescopic rod 164 are respectively hinged to the inner groove 163 and the top plate 165, and the outer gear 162 is meshed with the driving ring 152, so that during the rotation of the outer gear 162, it will be restricted when it contacts the top plate 165, and when the inner rotating component When the lowest structure on 17 can rotate normally, the telescopic rod 164 will not be compressed, and the outer gear 162 will drive the center seat 161 to rotate. When encountering resistance, the outer gear 162 will continue to rotate under the continuous rotation of the drive ring 152, which will compress the telescopic rod 164, causing the top plate 165 to contract and thus realize the independent rotation of the outer gear 162. In this way, the inner rotating component 17 is guaranteed to push the material at the bottom of the upper surface of the annular air cavity 6, and the jamming between the structures is avoided, thereby ensuring the applicability of the device.

[0046] See also Figure 1-5 , a feeding device for aluminum nitride powder, comprising an inner rotating assembly 17, the inner rotating assembly 17 comprises a base ring 171, a sealing plate 172 is fixedly mounted on the top of the base ring 171, a first crushing knife 173 is fixedly mounted on the outer side of the base ring 171, and a wind resistance plate 174 is fixedly mounted on the outer side of the base ring 171;

[0047] In this embodiment, it should be noted that the base ring 171 is rotatably arranged inside the annular chamber 1, one end of the sealing plate 172 is aligned with the first crushing knife 173, the first crushing knife 173 and the second crushing knife 18 are staggered and stacked, and the end of the bottom first crushing knife 173 facing the air flow inside the annular chamber 1 is fixedly connected to the transmission assembly 16 and rotatably arranged, so that the ventilation effect is the lowest when the first crushing knife 173 and the second crushing knife 18 overlap, and the sealing plate 172 does not close the outlet at the position of the air outlet guide cavity 7 in this state, so that the airflow can carry the least raw material powder to flow out from the air outlet ring 8, thereby avoiding carrying out agglomerated raw materials, and when the first crushing knife 173 and the second crushing knife 18 are staggered, the sealing plate 172 will close the outlet between the air outlet ring 8 and the annular chamber 1, thereby ensuring that the agglomerated raw materials can continue to circulate and rotate in the annular chamber 1 after being blown up, until they are crushed into powder that can be carried and filtered and flow downward.

[0048] Working principle: put the aluminum nitride raw material to be processed into the raw material storage bin 4, start the device, and the blasting device 3 generates a high-speed airflow into the air intake pipe 2 and the branch air intake pipe 5. The raw material storage bin 4 discharges the raw material downward in a quantitative manner, and is driven into the annular chamber 1 by the flow of air in the air intake pipe 2. When the airflow blows to the wind resistance plate 174, it will drive the base ring 171 to rotate. At the same time, the driving motor 14 will also drive the driving ring 152 and the scraper rod 156 to rotate. During the flow of the raw material inside the annular chamber 1, it will collide with the first crushing knife 173 and the second crushing knife 18, and then the agglomerated part will be broken. The rotation of the driving ring 152 and the outer gear 162 will drive the first crushing knife 173 at the bottom to rotate intermittently, thereby achieving The first crushing knife 173 is intermittently driven to scoop up and push the raw materials deposited on the upper surface of the annular air cavity 6, and when it is pushed to the air outlet grid of the annular air cavity 6, it will be blown up again. Combined with the continuous annular airflow, the agglomerated parts will be repeatedly impacted and crushed. The crushed raw materials will be filtered into the gathering chamber 10 when passing the position of the discharge chamber 9, and a small amount of powder will also enter the gathering chamber 10 through the air outlet ring 8 with the flow of airflow, and be transported to the coverage area of ​​the scraper rod 156 by the guide table 154, and then the scraper rod 156 is rotated to scrape the powder to the lower discharge component 11 for discharge, and the airflow will continue to discharge from the exhaust groove 112, and the powder will be discharged through the bottom end of the discharge pipe 111 for subsequent loading.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A feeding device for aluminum nitride powder, comprising an annular chamber (1), characterized in that: An air intake pipe (2) is fixedly installed on one side of the annular chamber (1), a blast device (3) is fixedly installed on the end of the air intake pipe (2), a raw material storage bin (4) is fixedly installed on the top of the air intake pipe (2), a branch air intake pipe (5) is fixedly installed on the bottom of the blast device (3), an annular air cavity (6) is fixedly installed on the bottom of the annular chamber (1), an air outlet guide cavity (7) is fixedly installed on the top of the annular chamber (1), an air outlet ring (8) is fixedly installed in the middle of the annular chamber (1), a discharge chamber (9) is fixedly installed on the bottom of the annular chamber (1), and a discharge chamber (9) is fixedly installed on the bottom of the discharge chamber (9). A material collecting chamber (10) is provided, a lower material discharging assembly (11) is fixedly installed at the bottom end of the material collecting chamber (10), a supporting leg (12) is fixedly installed at the bottom end of the material collecting chamber (10), a supporting ring (13) is fixedly installed at the center of the inner part of the air outlet ring (8), a driving motor (14) is fixedly installed in the supporting ring (13), a rotating assembly (15) is fixedly installed on the output shaft of the driving motor (14), an inner rotating assembly (17) is movably installed inside the annular chamber (1), a transmission assembly (16) is movably installed on the inner rotating assembly (17), and a second crushing knife (18) is fixedly installed inside the annular chamber (1); The lower discharge assembly (11) comprises a discharge pipe (111), two sides of the discharge pipe (111) are respectively provided with exhaust grooves (112), and a baffle (113) is fixedly installed inside the discharge pipe (111); The rotating assembly (15) comprises a base plate (151), a driving ring (152) is fixedly mounted on the base plate (151), a connecting rod (153) is fixedly mounted on the bottom end of the base plate (151), a material guide platform (154) is fixedly mounted on the bottom end of the connecting rod (153), a bottom ring (155) is fixedly mounted on the bottom end of the material guide platform (154), and a scraper rod (156) is fixedly mounted on the bottom ring (155); The transmission assembly (16) comprises a center seat (161) and an external gear (162); an inner groove (163) is provided on the center seat (161); a telescopic rod (164) is movably installed inside the inner groove (163); and a top plate (165) is movably installed in the inner groove (163); The inner rotating component (17) comprises a base ring (171), a sealing plate (172) is fixedly mounted on the top of the base ring (171), a first crushing knife (173) is fixedly mounted on the outer side surface of the base ring (171), and a wind resistance plate (174) is fixedly mounted on the outer side surface of the base ring (171).

2. A feeding device for aluminum nitride powder according to claim 1, characterized in that: The end of the branch air intake pipe (5) is connected to the annular air cavity (6) in a through-and-through manner. The annular air cavity (6) is located at the bottom end of the annular chamber (1) and is sealed and fixedly installed. The bottom end of the raw material storage bin (4) is connected to the air intake pipe (2) via a feed pipe.

3. A feeding device for aluminum nitride powder according to claim 1, characterized in that: The top of the annular air cavity (6) is provided with an air outlet grid, and the air outlet grid is offset from the second crushing knife (18). The air outlet guide cavity (7) is connected to the top of the air outlet ring (8), and the bottom of the air outlet ring (8) is connected to the inside of the collecting chamber (10) in a sealed manner through an extension pipe.

4. The feeding device for aluminum nitride powder according to claim 1, characterized in that: The discharge chamber (9) is connected to the top of the collection chamber (10), a filter screen is provided at the top of the discharge chamber (9), and the air outlet grid on the annular air cavity (6) is opened at a position after the air outlet guide cavity (7) in the annular flow direction of the air flow.

5. The feeding device for aluminum nitride powder according to claim 1, characterized in that: The discharge pipe (111) is of a trapezoidal structure and has a larger cross-sectional area at the bottom end. The exhaust grooves (112) are opened on the inclined surfaces on both sides of the discharge pipe (111). The baffle plate (113) is fixedly installed downward above each exhaust groove (112).

6. A feeding device for aluminum nitride powder according to claim 1, characterized in that: The base plate (151) is provided with a through groove, and a plurality of racks of the same length are evenly arranged on the upper surface of the drive ring (152). The drive ring (152) is meshed with the transmission assembly (16), and the drive ring (152) is arranged inside the air outlet ring (8).

7. A feeding device for aluminum nitride powder according to claim 6, characterized in that: The material guide platform (154) is rotatably arranged inside the material collection chamber (10). The material guide platform (154) is in the shape of a truncated cone with a small top and a large bottom. The bottom diameter of the material guide platform (154) is half of the internal diameter of the material collection chamber (10). The bottom ring (155) has the same size as the bottom of the material guide platform (154). The bottom end of the scraper rod (156) is slidably arranged in contact with the bottom end of the internal part of the material collection chamber (10).

8. The feeding device for aluminum nitride powder according to claim 1, characterized in that: The center seat (161) is fixedly mounted on one end of the inner rotating assembly (17); the inner ring surface of the outer gear (162) is evenly provided with arc grooves; the inner ring surface of the outer gear (162) is slidably arranged in contact with the outer surface of the center seat (161); a spring is arranged inside the telescopic rod (164); the two ends of the telescopic rod (164) are respectively hinged to the inner groove (163) and the top plate (165); and the outer gear (162) is meshed with the driving ring (152).

9. The feeding device for aluminum nitride powder according to claim 1, characterized in that: The base ring (171) is rotatably arranged inside the annular chamber (1), one end of the sealing plate (172) is aligned with the first crushing knife (173), the first crushing knife (173) and the second crushing knife (18) are arranged in an alternating and overlapping manner, and the bottom end of the first crushing knife (173) facing the air flow inside the annular chamber (1) is fixedly connected to the transmission component (16) and can be rotatably arranged.

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