SIC powder screening device

Abstract

The utility model relates to the technical field of powder screening equipment, and discloses an SIC powder screening device. The device comprises a vacuum machine, a feeding mechanism and a screening device which are sequentially arranged on a working table, the vacuum machine is connected with the feeding mechanism through a pipeline to form a negative pressure channel; the feeding mechanism comprises a rack and a feeding assembly arranged on the rack. The screening device is arranged on one side of the feeding mechanism and comprises a first rotary vibration sieve and a second rotary vibration sieve which are close to each other and are arranged on the working table top, two material storage mechanisms are arranged on the working table top on one side of the first rotary vibration sieve, and a plurality of material weighing mechanisms are arranged on the working table top on the circumferential position of the second rotary vibration sieve; the feeding assembly is arranged on the portion, on one side of the feeding mechanism, of the working table and connected with the feeding assembly through a pipeline. According to the SIC powder screening device, full-automatic integrated screening of SIC powder of various meshes is achieved, the complex mode that multiple devices are independently used for screening is omitted, and the screening efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of powder screening equipment, in particular to a SIC powder screening device. Background Art

[0002] SIC (silicon carbide) is a very important industrial raw material, used in various industries and fields. SIC powder can be mixed with other materials to make refractory materials with high temperature stability and corrosion resistance. It can also be made into substrates and packaging materials in electronic devices. It has excellent thermal and electrical conductivity. Therefore, it is widely used in semiconductors and other fields.

[0003] In the semiconductor field, SIC raw materials usually need to be crushed and screened to obtain powders of required mesh sizes. In existing production, after the SIC raw materials are crushed, they are screened multiple times through different vibrating screens to obtain SIC powders of different mesh sizes. This screening method is not only cumbersome to operate, but also has low screening efficiency.

[0004] Therefore, there is an urgent need for a SIC powder screening device to solve the above problems. Utility Model Content

[0005] Based on the above, the purpose of the present invention is to provide a SIC powder screening device to solve the problem that the screening method of SIC powder in the background art is complicated and the screening efficiency is low.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The SIC powder screening device provided by the utility model comprises a work surface, and is characterized in that it also comprises a vacuum machine, a feeding mechanism and a screening device which are sequentially arranged on the work surface; the vacuum machine is connected to the feeding mechanism through a pipeline to form a negative pressure channel; the feeding mechanism comprises a frame and a feeding assembly arranged on the frame; the screening device is arranged on a side of the feeding mechanism away from the vacuum machine, and comprises a first rotary vibrating screen and a second rotary vibrating screen which are arranged close to each other on the work surface, two material storage mechanisms connected to the first rotary vibrating screen pipeline are arranged on the work surface on one side of the first rotary vibrating screen, and a plurality of material weighing mechanisms connected to the second rotary vibrating screen pipeline are arranged on the work surface at a circumferential position of the second rotary vibrating screen; a feeding assembly is arranged on the work surface on one side of the feeding mechanism at a distance from the vacuum machine, and is connected to the feeding assembly pipeline.

[0008] As an optional technical solution for the SIC powder screening device, there are two feeding assemblies, which are arranged above the frame at intervals. The feeding assembly includes a first filter cartridge and a conical hopper connected below the first filter cartridge. An air outlet is provided on the top of the first filter cartridge, and a second feed port is provided on a side surface close to the lower end of the first filter cartridge.

[0009] As an optional technical solution for the SIC powder screening device, an electric butterfly valve is provided between the first filter cylinder and the conical hopper, a material guide pipe is connected to the lower end of the conical hopper, the other end of the material guide pipe passes through the frame, extends to the outside of the frame and is connected to the first rotary vibrating screen; a straight vibrator is provided below the material guide pipe and abuts against the bottom of the material guide pipe.

[0010] As an optional technical solution for the SIC powder screening device, the vacuum machine includes a vacuum pump and a second filter cartridge connected to the vacuum pump by a pipeline, the second filter cartridge is provided with an air inlet hole, and the air inlet hole is connected to the two air outlet holes on the two feeding assemblies by pipelines.

[0011] As an optional technical solution for the SIC powder screening device, the feeding assembly includes a "Y"-shaped feeding pipe and a first feeding port arranged on the "Y"-shaped feeding pipe, one end of the "Y"-shaped feeding pipe is provided with a breathing valve, and the other end of the "Y"-shaped feeding pipe is respectively connected to the two second feeding port pipes on the two loading assemblies.

[0012] As an optional technical solution for the SIC powder screening device, two first rotary vibrating screens are provided, and the two first rotary vibrating screens are arranged in mirror image on the work table on one side of the feeding mechanism. The two first rotary vibrating screens are provided with three layers of first screening material layers from top to bottom, and each layer of the first screening material layer is provided with a first discharge interface.

[0013] As an optional technical solution for the SIC powder screening device, the storage mechanism includes a storage box and two third feed ports opened on the top surface of the storage box, and a first discharge port is also provided at the bottom of the storage box; the two first screening layers located at the top and bottom of the first rotary vibrating screen are respectively connected to the third feed port pipeline.

[0014] As an optional technical solution for the SIC powder screening device, two second rotary vibrating screens are provided, and the two second rotary vibrating screens are mirror-imaged to each other on the work surface of the first rotary vibrating screen on the side away from the feeding mechanism, and the first discharge interface on the middle layer of the first screening layer is connected to the pipeline of the second rotary vibrating screen; the two second rotary vibrating screens are respectively provided with three second screening layers, and each layer of the second screening layer is provided with a second discharge interface.

[0015] As an optional technical solution for the SIC powder screening device, the weighing mechanism is divided into two groups, each group of the weighing mechanisms is divided into three groups and are arranged on the work surface along the circumference of the second vibrating screen. The weighing mechanism includes a storage funnel and a fourth feed port opened on the upper end surface of the storage funnel. The second discharge interface on the second screening layer is respectively connected to the fourth feed port pipes on the two groups of the weighing mechanisms.

[0016] As an optional technical solution for the SIC powder screening device, the weighing mechanism also includes a bracket for mounting the storage funnel, two relatively overlapping mounting plates are provided at the upper end of the bracket, and gravity sensors are provided at the middle positions of the four sides between the two mounting plates; a unloading assembly is provided below the storage funnel, and the unloading assembly includes a unloading cylinder installed in the middle of the bracket and a unloading valve connected to the output end of the unloading cylinder, the top surface of the unloading valve is connected to the bottom end of the storage funnel, and the bottom surface of the unloading valve is provided with a second unloading port for discharging material.

[0017] The beneficial effects of the utility model are:

[0018] The utility model provides a SIC powder screening device, which comprises a feeding assembly, a vacuum machine, a feeding mechanism and a screening device which are sequentially arranged on a work surface, and the vacuum machine is started. The vacuum pump evacuates the feeding assembly on the feeding mechanism, thereby forming a negative pressure channel between the feeding assembly and the feeding assembly, and then the crushed SIC powder is input from the first feeding port on the feeding assembly, and the powder is sucked into the lower end of the first filtering assembly under the negative pressure provided by the vacuum machine, and the electric butterfly valve opens and then falls into the conical funnel, and under the action of the vibration of the straight vibrator, the powder enters the first rotary vibrating screen along the guide pipe, and passes through the three first screening layers arranged in the first rotary vibrating screen, and the powder with the largest and smallest meshes is input into the storage mechanism, etc. To be unloaded; the powder in the first screening layer in the middle layer is input into the second rotary vibrating screen; the second rotary vibrating screen continues to screen the powder into three different mesh sizes, and inputs them into the corresponding storage funnel on the weighing mechanism respectively, waiting for the next process of unloading and packaging; under the above structure, the SIC powder screening device finally obtains five different mesh sizes of SIC powder from the input of the crushed SIC crushed powder after screening by the first rotary vibrating screen and the second rotary vibrating screen, and stores them in different mechanisms, waiting for unloading or packaging in the next process. The SIC powder screening device realizes the fully automatic integrated screening of SIC powders of various mesh sizes, eliminating the complicated screening method of multiple devices separately, and improving the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the SIC powder screening device according to an embodiment of the utility model;

[0020] Figure 2 This is a partially exploded schematic diagram of the SIC powder screening device according to an embodiment of the utility model at another viewing angle;

[0021] Figure 3 This is a schematic diagram of the structure of the feeding assembly in the embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the feed assembly in the embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the vacuum machine in the embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the screening device in the embodiment of the utility model;

[0025] Figure 7 This is a structural schematic diagram of the material storage mechanism in the embodiment of the utility model;

[0026] Figure 8 This is a structural schematic diagram of the weighing mechanism in the embodiment of the utility model;

[0027] In the figure:

[0028] 1. Vacuum machine; 10. Vacuum pump; 11. Second filter cartridge; 12. Air inlet;

[0029] 2. Work surface;

[0030] 3. Feed assembly; 30. First feed port; 31. "Y"-shaped feed pipe; 32. Breathing valve;

[0031] 4. Feeding mechanism; 41. Frame; 42. Feeding assembly; 420. First filter cartridge; 421. Air outlet; 422. Second feed inlet; 423. Reinforcement plate; 424. Electric butterfly valve; 425. Conical hopper; 426. Material guide pipe; 427. Straight vibrator;

[0032] 5. First rotary vibrating screen; 51. First screening layer; 52. First discharging interface;

[0033] 6. Second rotary vibrating screen; 61. Second screening material layer; 62. Second material discharging interface;

[0034] 7. Material storage mechanism; 71. Material storage box; 72. Third material feed port; 73. First material discharge port;

[0035] 8. Weighing mechanism; 81. Storage funnel; 810. Fourth feed port; 82. Mounting plate; 820. Gravity sensor; 83. Bracket; 84. Discharge assembly; 841. Discharge cylinder; 842. Discharge valve; 843. Second discharge port. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present utility model.

[0040] In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more than two. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] like Figure 1-8As shown, the utility model provides a SIC powder screening device, which includes a vacuum machine 1, a feeding mechanism 4 and a screening device which are sequentially arranged on a work surface 2; the vacuum machine 1 is connected to the feeding mechanism 4 through a pipeline to form a negative pressure channel; the feeding mechanism 4 includes a frame 41 and a feeding assembly 42 arranged on the frame 41; the screening device is arranged on a side of the feeding mechanism 4 away from the vacuum machine 1, including a first rotary vibrating screen 5 and a second rotary vibrating screen 6 which are arranged close to each other on the work surface 2, two storage mechanisms 7 which are connected to the first rotary vibrating screen 5 through a pipeline are arranged on the work surface 2 on one side of the first rotary vibrating screen 5, and a plurality of weighing mechanisms 8 which are connected to the second rotary vibrating screen 6 through a pipeline are arranged on the work surface 2 at a circumferential position of the second rotary vibrating screen 6; a feeding assembly 3 which is arranged on the work surface 2 on one side of the feeding mechanism 4 at a distance from the vacuum machine 1, and is connected to the feeding assembly 42 through a pipeline.

[0042] The SIC powder screening device provided by the utility model starts the vacuum machine 1, and the vacuum pump 10 evacuates the feeding assembly 42 on the feeding mechanism 4, so as to form a negative pressure channel between the feeding assembly 3 and the feeding assembly 42, and then the crushed SIC powder is input from the first feeding port 30 on the feeding assembly 3, and the powder is sucked into the lower end of the first filtering assembly under the negative pressure provided by the vacuum machine 1, and the electric butterfly valve 424 opens and then falls into the conical funnel, and under the vibration of the straight vibrator 427, the powder enters the first rotary vibrating screen 5 along the guide pipe 426, and passes through the three-layer first screening material layer 5 arranged in the first rotary vibrating screen 5. 1, input the powders of the largest and smallest meshes into the storage mechanism 7 to wait for unloading; the powders in the first screening layer 51 of the middle layer are input into the second rotary vibrating screen 6; the second rotary vibrating screen 6 continues to screen the powders into three different meshes, and input them into the corresponding storage funnel 81 on the weighing mechanism 8 respectively, waiting for unloading and subpackaging in the next process; under the above structure, the SIC powder screening device finally obtains five different meshes of SIC powders from the input of the crushed SIC crushed powder after screening by the first rotary vibrating screen 5 and the second rotary vibrating screen 6, and stores them in different mechanisms, waiting for unloading or subpackaging in the next process. The SIC powder screening device realizes the fully automatic integrated screening of SIC powders of various meshes, eliminating the complicated screening method of multiple devices separately, and improving the screening efficiency.

[0043] In this embodiment, if Figure 2 and Figure 3As shown, two feeding assemblies 42 are arranged at intervals on the frame 41, that is, the feeding mechanism 4 is a double-station arrangement, and the feeding assembly 42 includes a first filter cartridge 420 arranged on the top of the frame 41, and the first filter cartridge 420 is vertically arranged on the top of the frame 41 through a reinforcing plate 423, and a part of the lower end extends into the frame 41, and an air outlet 421 is provided on the top of the first filter cartridge 420 for connecting to the vacuum machine 1, and a second feed port 422 is provided on a side surface of the first filter cartridge 420 near the bottom end for connecting to the feeding assembly 3; a conical hopper 425 is installed in the frame 41, and the conical hopper 425 is connected to the bottom end of the first filter cartridge 420 for opening and closing through an electric butterfly valve 424, and the electric butterfly valve 424 can control the opening and closing between the conical hopper 425 and the first filter cartridge 420 , thereby controlling the amount of SIC powder entering the conical hopper 425. At the same time, a guide pipe 426 is connected to the opening at the bottom end of the conical hopper 425. The other end of the guide pipe 426 extends to the outside of the frame 41 and is conductively connected to the first rotary vibrating screen 5. The SIC powder in the conical hopper 425 is output to the first rotary vibrating screen 5 through the guide pipe 426 for the first screening. A straight vibrator 427 is also installed below the guide pipe 426. Two annular locking supports are installed on the top surface of the straight vibrator 427 at intervals. The straight vibrator 427 is abutted against the bottom of the guide pipe 426 through the two annular locking supports. That is to say, the two annular locking supports tightly embrace and lock the guide pipe 426 on the top surface of the straight vibrator 427. The straight vibrator 427 can give the guide pipe 426 a certain vibration, so that the SIC powder in the guide pipe 426 can be output more quickly and linearly, thereby preventing the SIC powder from being blocked and improving the stability of the feeding mechanism 4 and the feeding efficiency.

[0044] In this embodiment, if Figure 5 As shown, the vacuum machine 1 includes a vacuum pump 10 installed on a mounting frame and a second filter cartridge 11 connected to the vacuum pump 10 by a pipeline. An air inlet 12 is provided on the side of the second filter cartridge 11. The air inlet 12 can be connected to two air outlets 421 on the feeding mechanism 4 through a one-to-two pipeline, so that one vacuum machine 1 can provide negative pressure airflow to the feeding mechanisms 4 of two workstations at the same time, saving equipment costs and installation space. The provision of the second filter cartridge 11 further filters the air dust flowing into the vacuum pump 10, thereby ensuring the stable operation of the vacuum machine 1.

[0045] Further, such as Figure 2 and Figure 4As shown, the feeding assembly 3 is arranged on the work table 2 on one side of the feeding mechanism 4 and is arranged opposite to the vacuum machine 1. A protective frame is arranged above the feeding assembly 3. The feeding assembly 3 includes a "Y"-shaped feeding pipe 31, and a first feeding port 30 is arranged on the straight pipe of the "Y"-shaped feeding pipe 31. A breathing valve 32 is installed at one end of the "Y"-shaped feeding pipe 31. The setting of the breathing valve 32 prevents damage to its pipeline and equipment due to excessive negative pressure. The two outlets on the other end of the "Y"-shaped feeding pipe 31 are respectively connected to the two second feeding ports 422 of the feeding mechanism 4 by pipelines. The setting of the "Y"-shaped feeding pipe 31 can feed two feeding assemblies 42 at the same time, which improves production efficiency.

[0046] In this embodiment, if Figures 6 to 8 As shown, the SIC powder screening device is composed of two first rotary vibrating screens 5, two second rotary vibrating screens 6, two material storage mechanisms 7 and six material weighing mechanisms 8. An integrated device for IC powder screening and classification collection, wherein one first rotary vibrating screen 5 and one second rotary vibrating screen 6 are arranged close to each other, and another first rotary vibrating screen 5 and another second rotary vibrating screen 6 are arranged close to each other, that is to say, the first rotary vibrating screen 5 and the second rotary vibrating screen 6 are divided into two groups, and the two groups of first rotary vibrating screens 5 and second rotary vibrating screens 6 are arranged in mirror image on the work surface 2, the two first rotary vibrating screens 5 are respectively conductively connected to the two material guide pipes 426 on the feeding mechanism 4, two storage mechanisms 7 are arranged between the two groups of first rotary vibrating screens 5 and second rotary vibrating screens 6, and are conductively connected to the two first rotary vibrating screens 5, six weighing mechanisms 8 are divided into two groups, each group has three, and each group of weighing mechanisms 8 is respectively arranged circumferentially around the two second rotary vibrating screens 6 on the work surface 2, and is conductively connected to the two second rotary vibrating screens 6. The SIC powder screening device is actually a double-station screening device, which improves the screening efficiency.

[0047] Specifically, Figure 6 As shown, the upper part of the first rotary vibrating screen 5 is a screening layer, and the lower part is a vibration mechanism. The screening layer is divided into three first screening layers, and the mesh number of the filter screen set in each layer is different, and a first discharge interface 52 is provided on each screening layer. The upper part of the second rotary vibrating screen 6 is a screening layer, and the lower part is a vibration mechanism. The screening layer is divided into three layers, and the mesh number of the filter screen set in each layer is different, and a second discharge interface 62 is provided on each screening layer. The first discharge interfaces 52 on the middle layers of the two first rotary vibrating screens 5 are respectively connected to the second rotary vibrating screen 6 through pipelines, that is, the SIC powder screened out in the first screening of the middle layer of the first rotary vibrating screen 5 will be input into the second rotary vibrating screen 6 for a second screening.

[0048] Specifically, Figure 7As shown, the storage mechanism 7 includes a storage box 71 and two third feed ports 72 opened on the top surface of the storage box 71. The two third feed ports 72 are respectively connected to the first discharge interfaces 52 of the top layer and the bottom layer on the first rotary vibrating screen 5 through pipelines, that is, the SIC powder on the top layer and the bottom layer on the first rotary vibrating screen 5 will be input into the two storage boxes 71 through pipelines. The bottom of the storage box 71 is connected to the first discharge port 73 through a valve. The storage box 71 is set on a mounting frame, and a gravity sensor 820 is provided at the top of the mounting frame and at the middle of the four sides of the storage box 71. When the powder in the storage box 71 reaches a certain weight, the valve is opened to discharge and collect the powder from the first discharge port 73.

[0049] Specifically, Figure 8 As shown, the weighing mechanism 8 includes a storage hopper 81 and a fourth feed port 810 opened on the upper end surface of the storage hopper 81. The second discharge interface 62 on the second screening layer 61 is respectively connected to the fourth feed ports 810 on the two groups of weighing mechanisms 8. The three types of SIC powders with different mesh sizes screened out by the six screening layers on the two second rotary vibrating screens 6 are respectively input into the six storage hoppers 81 for storage. At the same time, the weighing mechanism 8 also includes a bracket 83. Two relatively overlapping mounting plates 82 are installed on the top of the bracket 83. The two mounting plates 82 A gravity sensor 820 is arranged in the middle of the four sides, the mounting plate 82 is a hollow structure, the storage funnel 81 is penetrated by the mounting plate 82, the lower end of the storage funnel 81 extends into the frame 41 and is connected to a discharge valve 842 at the lower end of the storage funnel 81, a discharge cylinder 841 is connected to one side of the discharge valve 842, the discharge cylinder 841 is installed in the middle position of the bracket 83, and a second discharge port 843 is connected to the bottom end of the discharge valve 842, and the discharge cylinder 841 is extended and retracted to drive the discharge valve 842 to realize the discharge and closing of the SIC powder in the storage funnel 81.

[0050] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the utility model, which does not depart from the content of the technical solution of the utility model, belongs to the scope of the technical solution of the utility model.

Claims

1. SIC powder screening device, including a work surface, characterized in that: It also includes a vacuum machine, a feeding mechanism and a screening device which are sequentially arranged on the work surface; The vacuum machine is connected to the feeding mechanism pipeline to form a negative pressure channel; The feeding mechanism comprises a frame and a feeding assembly arranged on the frame; The screening device is arranged on a side of the feeding mechanism away from the vacuum machine, and includes a first rotary vibrating screen and a second rotary vibrating screen arranged close to each other on the work surface, two material storage mechanisms connected to the first rotary vibrating screen pipeline are arranged on the work surface on one side of the first rotary vibrating screen, and a plurality of material weighing mechanisms connected to the second rotary vibrating screen pipeline are arranged on the work surface at a circumferential position of the second rotary vibrating screen; A feeding assembly is arranged on the work surface on one side of the feeding mechanism at a distance from the vacuum machine and is connected to a pipeline of the feeding assembly.

2. The SIC powder screening device according to claim 1, characterized in that: There are two feeding assemblies which are arranged above the frame at intervals. The feeding assemblies include a first filter cartridge and a conical hopper connected below the first filter cartridge. An air outlet is provided on the top of the first filter cartridge, and a second feed port is provided on a side surface close to the lower end of the first filter cartridge.

3. The SIC powder screening device according to claim 2, characterized in that: An electric butterfly valve is provided between the first filter cylinder and the conical hopper, a material guide pipe is connected to the lower end of the conical hopper, the other end of the material guide pipe passes through the frame, extends to the outside of the frame and is connected to the first rotary vibrating screen; a straight vibrator is provided below the material guide pipe and abuts against the bottom of the material guide pipe.

4. The SIC powder screening device according to claim 3, characterized in that: The vacuum machine comprises a vacuum pump and a second filter cartridge connected to the vacuum pump by a pipeline. The second filter cartridge is provided with an air inlet hole, and the air inlet hole is connected to the two air outlet holes on the two feeding assemblies by pipelines.

5. The SIC powder screening device according to claim 2, characterized in that: The feeding group includes a "Y"-shaped feeding pipe and a first feeding port arranged on the "Y"-shaped feeding pipe, a breathing valve is provided at one end of the "Y"-shaped feeding pipe, and the other end of the "Y"-shaped feeding pipe is respectively connected to the two second feeding port pipes on the two feeding assemblies.

6. The SIC powder screening device according to claim 1, characterized in that: There are two first rotary vibrating screens, which are mirror-imaged to each other on the work surface on one side of the feeding mechanism. The two first rotary vibrating screens are provided with three layers of first screening material from top to bottom, and each layer of the first screening material is provided with a first discharge interface.

7. The SIC powder screening device according to claim 6, characterized in that: The material storage mechanism includes a material storage box and two third material feed ports opened on the top surface of the material storage box. The bottom of the material storage box is also provided with a first material discharge port; the two first screening material layers located at the top and bottom of the first rotary vibrating screen are respectively connected to the third material feed port pipeline.

8. The SIC powder screening device according to claim 7, characterized in that: There are two second rotary vibrating screens, which are mirror-imaged to each other on the work surface of the first rotary vibrating screen on the side away from the feeding mechanism. The first discharge interface on the middle layer of the first screening material layer is connected to the pipeline of the second rotary vibrating screen; the two second rotary vibrating screens are respectively provided with three layers of second screening material layers, and each layer of the second screening material layer is provided with a second discharge interface.

9. The SIC powder screening device according to claim 8, characterized in that: There are two groups of weighing mechanisms, each group of which has three weighing mechanisms and are arranged on the work surface along the circumference of the second vibrating screen. The weighing mechanisms include a storage funnel and a fourth feed port opened on the upper end surface of the storage funnel. The second discharge interface on the second screening layer is respectively connected to the fourth feed port pipes on the two groups of weighing mechanisms.

10. The SIC powder screening device according to claim 9, characterized in that: The weighing mechanism also includes a bracket for installing the storage funnel, and two relatively overlapping mounting plates are provided at the upper end of the bracket, and gravity sensors are provided at the middle positions of the four sides between the two mounting plates; a unloading assembly is arranged below the storage funnel, and the unloading assembly includes a unloading cylinder installed in the middle of the bracket and a unloading valve connected to the output end of the unloading cylinder, the top surface of the unloading valve is connected to the bottom end of the storage funnel, and the bottom of the unloading valve is provided with a second unloading port for discharging materials.

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