Raw material screening device and method

Abstract

The invention relates to the technical field of raw material screening devices, in particular to a raw material screening device which comprises a screening box, a drying structure is arranged in the screening box, and the screening structure comprises a connecting disc, a motor, a material injection pipe opening, a sliding block, a fixing block, a fixing screw rod, a screening net cylinder, a connecting rod, a connecting insertion block and a connecting socket. According to the raw material screening device and method, the drying structure is arranged, raw materials screened in the screening net cylinder can enter the containing groove, the containing groove is directly heated through the electric heating pipe, primary drying of the raw materials in the containing groove is achieved, a fan can extract external air, and the raw materials can be dried conveniently. And after being heated by the electric heating rod, the extracted air is sprayed to the raw materials in the containing groove to further dry the raw materials, so that the raw material screening device can have the functions of screening and drying the food raw materials at the same time, and the overall food processing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of raw material screening devices, and in particular to a raw material screening device and method. Background Art

[0002] The raw material screening device is a device used to screen and separate food raw materials to remove raw materials that do not meet quality requirements or safety standards. The purpose of the raw material screening device is to ensure that the raw materials used in the food production process meet hygiene standards, quality requirements and regulatory requirements, thereby ensuring the safety and quality of food. It plays an important role in the food processing industry, helping food producers reduce risks, ensure that the raw materials used meet standards, and improve the quality and safety of food production.

[0003] Existing food raw material screening devices can effectively remove raw materials that do not meet quality requirements or safety standards in terms of screening. However, for some food raw materials, screening alone may not meet the needs of the production process because the raw materials after screening may still contain too much moisture. In this case, a common practice is to use separate drying equipment to dry the food raw materials to remove moisture, but this practice will increase the expenditure on purchasing food processing equipment and introduce additional food processing steps, thereby increasing the overall food processing cost. Therefore, we propose a raw material screening device and method. Summary of the invention

[0004] 1. Technical problems solved

[0005] In view of the shortcomings of the prior art, the present invention provides a raw material screening device and method, which have the advantages of integrated screening and drying of food raw materials, and solve the problem that for some food raw materials, only screening may not meet the needs of the production process, because the raw materials after screening may still contain too much moisture. In this case, the common practice is to use separate drying equipment to dry the food raw materials to remove moisture, but this practice will increase the expenditure on purchasing food processing equipment and introduce additional food processing steps, thereby increasing the overall food processing cost.

[0006] 2. Technical solution

[0007] In order to achieve the purpose of integrated screening and drying of the above-mentioned food raw materials, the present invention provides the following technical solutions: a raw material screening device, comprising a screening box, a top cover movably installed on the top of the screening box, a screening structure arranged inside the screening box, and a drying structure arranged inside the screening box; The screening structure comprises a connecting plate, a motor, a material injection nozzle, a sliding block, a fixed block, a fixed screw, a screening net cylinder, a connecting rod, a connecting plug and a connecting socket. The bottom of the top cover is fixedly installed with a connecting plate, the top of the top cover is fixedly installed with a motor, the top of the top cover is fixedly installed with a material injection nozzle, the bottom of the connecting plate is slidably connected with a sliding block, the bottom of the sliding block is fixedly installed with a fixed block, the internal thread of the fixed block is connected with a fixing screw, the bottom of the connecting plate is movably installed with a screening net cylinder, the inside of the screening net cylinder is fixedly installed with a connecting rod, the top of the connecting rod is fixedly installed with a connecting plug, and the top of the connecting plug is plugged with a connecting socket; The drying structure includes a receiving tank, an electric heating plate, an electric heating pipe, a material discharge pipe opening, a ventilation box, a ventilation pipe, a fan, an electric heating rod, a sponge filter plate, a rotating shaft and a mixing rod. The screening box is fixedly provided with a receiving tank inside, the bottom of the receiving tank is fixedly provided with an electric heating plate, the inside of the electric heating plate is fixedly provided with an electric heating pipe, the bottom of the receiving tank is fixedly provided with a material discharge pipe opening, the outside of the screening box is fixedly provided with a ventilation box, a side of the ventilation box close to the screening box is fixedly provided with a ventilation pipe, the inside of the ventilation box is fixedly provided with a fan, the inside of the ventilation box is fixedly provided with an electric heating rod, the inside of the ventilation box is plugged with a sponge filter plate, the inside of the receiving tank is rotatably connected with a rotating shaft, and the outside of the rotating shaft is fixedly provided with a mixing rod.

[0008] Preferably, the top cover is internally rotatably connected with four threaded rods, the bottoms of the four threaded rods all pass through the top cover and are threadedly connected to the top of the screening box, the bottom of the injection nozzle passes through the top cover and the connecting plate and extends to the interior of the screening mesh cylinder, and the bottom of the injection nozzle is away from the connecting rods.

[0009] Preferably, an annular groove is provided at the bottom of the connecting plate, and two sliding blocks are slidably connected inside the annular groove. Fixed blocks are fixedly installed at the bottom of the two sliding blocks, and fixed screws are rotatably connected inside the two fixed blocks.

[0010] Preferably, the top of the screening mesh cylinder is fitted with the bottom of the connecting plate, the top outer surface of the screening mesh cylinder is fitted with two fixing blocks, the two fixing screws respectively penetrate the two fixing blocks and are threadedly connected to the screening mesh cylinder, and the output shaft of the motor penetrates the top cover and the connecting plate and is fixedly connected to the connecting socket.

[0011] Preferably, the number of the connecting blocks and the connecting sockets are both two, one of the connecting blocks and one of the connecting sockets are both located inside the screening mesh cylinder, the other connecting socket is fixedly installed at the bottom of the screening mesh cylinder, and the other connecting block is fixedly installed at the top of the rotating shaft.

[0012] Preferably, there are two ventilation boxes, which are respectively located on the left and right sides of the screening box, and a first dustproof net is fixedly installed on the side of the two ventilation boxes away from the screening box, and a ventilation pipe is fixedly installed on the side of the two ventilation boxes close to the screening box, and the two ventilation pipes extend to the interior of the accommodating slot, and a second dustproof net is fixedly installed on the opposite side of the two ventilation pipes.

[0013] Preferably, fans are fixedly installed inside the two ventilation boxes, the electric heating rod is fixedly installed inside one of the ventilation boxes, and the sponge filter plate is plugged into the inside of the other ventilation box.

[0014] A raw material screening method, comprising a raw material screening device, further comprising the following steps: S1, put the raw materials into the screening cylinder through the injection nozzle; S2, start the motor, and drive the screening net cylinder to rotate by plugging the connecting block and the connecting socket into each other; S3. During the rotation of the screening drum, the raw materials that meet the production requirements are thrown out of the screening drum by centrifugal force, and the raw materials that meet the production requirements will naturally slide into the receiving tank; S4, starting the electric heating tube, the fan and the electric heating rod in sequence, the electric heating tube directly heats the containing tank to dry the raw materials inside it, and the fan can extract the outside air, and the extracted air is heated by the electric heating rod and then sprayed to the raw materials inside the containing tank to further dry them; S5. When the screening net drum rotates, it also drives the rotating shaft to rotate, so that the raw materials inside the containing tank are stirred and turned through the mixing rod outside the rotating shaft to ensure the drying quality and drying efficiency; S6. After the raw materials are dried, they leave the screening box through the discharge pipe.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the present invention provides a raw material screening device and method, which has the following beneficial effects: 1. The raw material screening device and method, by setting a drying structure, the raw materials that have been screened inside the screening mesh cylinder will enter the containing tank, and the containing tank will be directly heated by the electric heating tube to achieve preliminary drying of the raw materials inside the containing tank. In addition, the fan can draw in the outside air, and the drawn air is heated by the electric heating rod and then sprayed toward the raw materials inside the containing tank to further dry the raw materials, so that the raw material screening device can simultaneously have the functions of screening and drying food raw materials, thereby reducing the overall food processing cost.

[0017] 2. The raw material screening device and method, the electric heating rod is fixedly installed inside one of the ventilation boxes, the fan inside one of the ventilation boxes can draw air from the outside, and dry the raw materials inside the receiving tank after heating by the electric heating rod, while the fan inside the other ventilation box can draw air from the inside of the screening box, so that the air inside and outside the screening box can circulate, and the heated air can flow to better contact the raw materials inside the receiving tank to dry them. Many food raw materials are prone to produce debris and dust after drying, such as peanuts, melon seeds, etc., and the fan inside the other ventilation box can also absorb the debris and dust generated during the drying process, and filter and collect them through a sponge filter plate, thereby preventing the debris and dust from adhering to the inner wall of the screening box and affecting the subsequent use of the raw material screening device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the drying structure of the present invention; Figure 4 It is a schematic diagram of the screening structure of the present invention; Figure 5 For the present invention Figure 2 A is an enlarged structural diagram; Figure 6 It is a schematic diagram of the planar structure of the connection socket of the present invention.

[0019] In the figure: 1. screening box; 2. top cover; 3. screening structure; 301. connecting plate; 302. motor; 303. injection nozzle; 304. sliding block; 305. fixing block; 306. fixing screw; 307. screening net cylinder; 308. connecting rod; 309. connecting plug block; 310. connecting socket; 4. drying structure; 401. containing tank; 402. electric heating plate; 403. electric heating pipe; 404. discharge nozzle; 405. ventilation box; 406. ventilation pipe; 407. fan; 408. electric heating rod; 409. sponge filter plate; 410. rotating shaft; 411. mixing rod. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-6 A raw material screening device comprises a screening box 1, a top cover 2 is movably installed on the top of the screening box 1, a screening structure 3 is arranged inside the screening box 1, and a drying structure 4 is arranged inside the screening box 1; The screening structure 3 includes a connecting plate 301, a motor 302, a material injection nozzle 303, a sliding block 304, a fixed block 305, a fixed screw 306, a screening net cylinder 307, a connecting rod 308, a connecting plug 309 and a connecting socket 310. The connecting plate 301 is fixedly installed at the bottom of the top cover 2, the motor 302 is fixedly installed at the top of the top cover 2, the material injection nozzle 303 is fixedly installed at the top of the top cover 2, the bottom of the connecting plate 301 is slidably connected with the sliding block 304, the bottom of the sliding block 304 is fixedly installed with the fixed block 305, the internal thread of the fixed block 305 is connected with the fixed screw 306, the bottom of the connecting plate 301 is movably installed with the screening net cylinder 307, the inside of the screening net cylinder 307 is fixedly installed with the connecting rod 308, the top of the connecting rod 308 is fixedly installed with the connecting plug 309, and the top of the connecting plug 309 is plugged with the connecting socket 310; The drying structure 4 includes a receiving tank 401, an electric heating plate 402, an electric heating pipe 403, a feeding pipe opening 404, a ventilation box 405, a ventilation pipe 406, a fan 407, an electric heating rod 408, a sponge filter plate 409, a rotating shaft 410 and a mixing rod 411. The receiving tank 401 is fixedly installed inside the screening box 1, and the electric heating plate 402 is fixedly installed at the bottom of the receiving tank 401. The electric heating pipe 403 is fixedly installed inside the electric heating plate 402, and the bottom of the receiving tank 401 is fixedly installed. A discharge pipe port 404 is installed, a ventilation box 405 is fixedly installed on the outside of the screening box 1, a ventilation pipe 406 is fixedly installed on the side of the ventilation box 405 close to the screening box 1, a fan 407 is fixedly installed inside the ventilation box 405, an electric heating rod 408 is fixedly installed inside the ventilation box 405, a sponge filter plate 409 is inserted inside the ventilation box 405, a rotating shaft 410 is rotatably connected to the inside of the accommodating groove 401, and a mixing rod 411 is fixedly installed outside the rotating shaft 410.

[0022] Specifically, four threaded rods are rotatably connected inside the top cover 2, the bottoms of the four threaded rods all pass through the top cover 2 and are threadedly connected to the top of the screening box 1, the bottom of the injection nozzle 303 passes through the top cover 2 and the connecting plate 301 and extends to the inside of the screening mesh cylinder 307, and the bottom of the injection nozzle 303 is away from the connecting rod 308.

[0023] Furthermore, the function of the four threaded rods is to fix the top cover 2 on the top of the screening box 1. After removing the four threaded rods, the top cover 2 can be separated from the screening box 1, which is convenient for maintenance of the screening structure 3 and the drying structure 4, and also convenient for cleaning the inner wall of the screening box 1.

[0024] Specifically, an annular groove is provided at the bottom of the connecting disk 301, and two sliding blocks 304 are slidably connected inside the annular groove. Fixed blocks 305 are fixedly installed at the bottom of the two sliding blocks 304, and fixed screws 306 are rotatably connected inside the two fixed blocks 305.

[0025] Furthermore, the function of the fixing block 305 and the fixing screw 306 is to fix the screening mesh cylinder 307. After removing the fixing screw 306 inside the fixing block 305, the screening mesh cylinder 307 can be removed from the bottom of the connecting plate 301, which is convenient for maintenance and cleaning of the screening mesh cylinder 307. The two sliding blocks 304 are slidably connected with the annular slide groove, which can make the screening mesh cylinder 307 more stable during rotation.

[0026] Specifically, the top of the screening net cylinder 307 fits with the bottom of the connecting disk 301, the top outer surface of the screening net cylinder 307 fits with the two fixing blocks 305, the two fixing screws 306 respectively penetrate the two fixing blocks 305 and are threadedly connected to the screening net cylinder 307, and the output shaft of the motor 302 penetrates the top cover 2 and the connecting disk 301 and is fixedly connected to the connecting socket 310.

[0027] Furthermore, the connecting plug 309 and the connecting socket 310 are plugged into each other, and at the same time, the connecting plug 309 and the connecting socket 310 can also be separated from each other. On the one hand, the screening net cylinder 307 can be removed from the inside of the screening box 1, and can also be removed from the bottom of the connecting plate 301. On the other hand, the screening net cylinder 307 can drive the rotating shaft 410 to rotate while rotating.

[0028] Specifically, there are two connecting blocks 309 and two connecting sockets 310, one of which is located inside the screening net cylinder 307, the other connecting socket 310 is fixedly installed at the bottom of the screening net cylinder 307, and the other connecting block 309 is fixedly installed at the top of the rotating shaft 410.

[0029] Furthermore, there are two discharge pipe openings 404, the bottoms of the two discharge pipe openings 404 penetrate the inner bottom wall of the screening box 1 and extend to the outside of the screening box 1, and the interiors of the two discharge pipe openings 404 are provided with electric control valves. After opening the electric control valves, the raw materials inside the receiving tank 401 can be discharged.

[0030] Specifically, there are two ventilation boxes 405, which are respectively located on the left and right sides of the screening box 1, and the first dust-proof net is fixedly installed on the side of the two ventilation boxes 405 away from the screening box 1, and the ventilation pipe 406 is fixedly installed on the side of the two ventilation boxes 405 close to the screening box 1. The two ventilation pipes 406 extend to the interior of the accommodating groove 401, and the second dust-proof net is fixedly installed on the opposite side of the two ventilation pipes 406.

[0031] Furthermore, the function of the first dustproof net is to prevent dust in the external environment from entering the interior of the ventilation box 405, while the function of the second dustproof net is to block the food raw materials inside the receiving groove 401, preventing the food raw materials inside the receiving groove 401 from entering the interior of the ventilation box 405.

[0032] Specifically, fans 407 are fixedly installed inside the two ventilation boxes 405 , an electric heating rod 408 is fixedly installed inside one of the ventilation boxes 405 , and a sponge filter plate 409 is plugged into the inside of the other ventilation box 405 .

[0033] Furthermore, the multi-layer sponge structure of the sponge filter plate 409 itself can block and intercept debris and dust in the air through tiny pores and channels. These debris and dust will be blocked by the fibers or tiny gaps of the sponge filter plate 409 when the air passes through the sponge filter plate 409, thereby achieving physical filtering and collection effects.

[0034] A raw material screening method, comprising a raw material screening device, further comprising the following steps: S1, feeding the raw materials into the screening cylinder 307 through the injection nozzle 303; S2, start the motor 302, and drive the screening cylinder 307 to rotate by plugging the connecting block 309 and the connecting socket 310 into each other; S3, during the rotation of the screening cylinder 307, the raw materials meeting the production requirements are thrown out of the screening cylinder 307 by centrifugal force, and the raw materials meeting the production requirements naturally slide into the containing tank 401; S4, the electric heating tube 403, the fan 407 and the electric heating rod 408 are sequentially started, the electric heating tube 403 directly heats the containing tank 401 to dry the raw materials inside it, and the fan 407 can extract the outside air, and the extracted air is heated by the electric heating rod 408 and then sprayed to the raw materials inside the containing tank 401 to further dry them; S5. When the screening net cylinder 307 rotates, it also drives the rotating shaft 410 to rotate, so that the raw materials in the containing tank 401 are stirred and turned through the mixing rod 411 outside the rotating shaft 410 to ensure the drying quality and drying efficiency; S6. After the raw materials are dried, they leave the screening box 1 through the discharge pipe 404.

[0035] To sum up, the raw material screening device and method, by setting up a drying structure 4, the raw materials that have been screened inside the screening mesh cylinder 307 will enter the receiving tank 401, and the receiving tank 401 will be directly heated by the electric heating tube 403 to achieve preliminary drying of the raw materials inside the receiving tank 401. In addition, the fan 407 can draw in external air, and the drawn air is heated by the electric heating rod 408 and then sprayed toward the raw materials inside the receiving tank 401 to further dry the raw materials, so that the raw material screening device can simultaneously have the functions of screening and drying food raw materials, thereby reducing the overall food processing cost.

[0036] Furthermore, in the raw material screening device and method, the electric heating rod 408 is fixedly installed inside one of the ventilation boxes 405, and the fan 407 inside one of the ventilation boxes 405 can draw air from the outside and dry the raw materials inside the receiving tank 401 after heating by the electric heating rod 408, while the fan 407 inside the other ventilation box 405 can draw air from the inside of the screening box 1, so that the air inside and outside the screening box 1 can circulate, so that the heated air can flow and better contact with the raw materials inside the receiving tank 401 to dry them, and many food raw materials are prone to produce debris and dust after drying, such as peanuts, melon seeds, etc. ... and the fan 407 inside the other ventilation box 405 can draw air from the inside of the screening box 1, so that the air inside and outside the screening box 1 can circulate, so that the heated air can flow and better contact with the raw materials inside the receiving tank 401 to dry them, and many food raw materials are prone to produce debris and dust after drying, such as peanuts, melon seeds, etc. The fan 407 inside the ventilation box 405 can also absorb the debris and dust generated during the drying process, and filter and collect them through the sponge filter plate 409, so as to prevent the debris and dust from adhering to the inner wall of the screening box 1 and affecting the subsequent use of the raw material screening device. This solves the problem that for some food raw materials, only screening may not meet the needs of the production process, because the raw materials after screening may still contain too much moisture. In this case, the common practice is to use a separate drying equipment to dry the food raw materials to remove moisture, but this practice will increase the expenditure on purchasing food processing equipment and introduce additional food processing steps, thereby increasing the overall food processing cost.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] 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 raw material screening device, comprising a screening box (1), characterized in that: A top cover (2) is movably mounted on the top of the screening box (1), a screening structure (3) is arranged inside the screening box (1), and a drying structure (4) is arranged inside the screening box (1); The screening structure (3) comprises a connecting plate (301), a motor (302), a material injection nozzle (303), a sliding block (304), a fixing block (305), a fixing screw (306), a screening net cylinder (307), a connecting rod (308), a connecting plug block (309) and a connecting socket (310); the connecting plate (301) is fixedly mounted on the bottom of the top cover (2); the motor (302) is fixedly mounted on the top of the top cover (2); the material injection nozzle (303) is fixedly mounted on the top of the top cover (2); the connecting plate (301) is fixedly mounted on the bottom of the top cover (2); 1) is slidably connected to a sliding block (304) at the bottom, a fixed block (305) is fixedly installed at the bottom of the sliding block (304), a fixed screw (306) is internally threadedly connected to the fixed block (305), a screening net cylinder (307) is movably installed at the bottom of the connecting plate (301), a connecting rod (308) is fixedly installed inside the screening net cylinder (307), a connecting plug block (309) is fixedly installed at the top of the connecting rod (308), and a connecting socket (310) is plugged into the top of the connecting plug block (309); The drying structure (4) comprises a containing tank (401), an electric heating plate (402), an electric heating pipe (403), a material discharge pipe opening (404), a ventilation box (405), a ventilation pipe (406), a fan (407), an electric heating rod (408), a sponge filter plate (409), a rotating shaft (410) and a mixing rod (411); the containing tank (401) is fixedly installed inside the screening box (1); the electric heating plate (402) is fixedly installed at the bottom of the containing tank (401); the electric heating pipe (403) is fixedly installed inside the electric heating plate (402); the bottom of the containing tank (401) is fixedly installed A discharge pipe opening (404) is fixedly installed, a ventilation box (405) is fixedly installed on the outside of the screening box (1), a ventilation pipe (406) is fixedly installed on the side of the ventilation box (405) close to the screening box (1), a fan (407) is fixedly installed inside the ventilation box (405), an electric heating rod (408) is fixedly installed inside the ventilation box (405), a sponge filter plate (409) is inserted inside the ventilation box (405), a rotating shaft (410) is rotatably connected to the inside of the accommodating groove (401), and a mixing rod (411) is fixedly installed outside the rotating shaft (410).

2. A raw material screening device according to claim 1, characterized in that: Four threaded rods are rotatably connected inside the top cover (2), the bottoms of the four threaded rods all pass through the top cover (2) and are all threadedly connected to the top of the screening box (1), the bottom of the injection nozzle (303) passes through the top cover (2) and the connecting plate (301) and extends to the inside of the screening net cylinder (307), and the bottom of the injection nozzle (303) is away from the connecting rod (308).

3. A raw material screening device according to claim 1, characterized in that: An annular sliding groove is provided at the bottom of the connecting plate (301), and two sliding blocks (304) are slidably connected inside the annular sliding groove. A fixed block (305) is fixedly installed at the bottom of the two sliding blocks (304), and a fixed screw (306) is rotatably connected inside the two fixed blocks (305).

4. A raw material screening device according to claim 1, characterized in that: The top of the screening net cylinder (307) fits with the bottom of the connecting plate (301), the top outer surface of the screening net cylinder (307) fits with the two fixing blocks (305), the two fixing screws (306) respectively penetrate the two fixing blocks (305) and are both threadedly connected to the screening net cylinder (307), and the output shaft of the motor (302) penetrates the top cover (2) and the connecting plate (301) and is fixedly connected to the connecting socket (310).

5. A raw material screening device according to claim 1, characterized in that: The number of the connecting plugs (309) and the connecting sockets (310) is two each, one of the connecting plugs (309) and one of the connecting sockets (310) are both located inside the screening net cylinder (307), the other connecting socket (310) is fixedly mounted on the bottom of the screening net cylinder (307), and the other connecting plug (309) is fixedly mounted on the top of the rotating shaft (410).

6. A raw material screening device according to claim 1, characterized in that: There are two ventilation boxes (405), which are respectively located on the left and right sides of the screening box (1), and a first dustproof net is fixedly installed on the side of the two ventilation boxes (405) away from the screening box (1), and a ventilation pipe (406) is fixedly installed on the side of the two ventilation boxes (405) close to the screening box (1), and the two ventilation pipes (406) extend to the inside of the accommodating groove (401), and a second dustproof net is fixedly installed on the opposite side of the two ventilation pipes (406).

7. A raw material screening device according to claim 1, characterized in that: A fan (407) is fixedly installed inside the two ventilation boxes (405), the electric heating rod (408) is fixedly installed inside one of the ventilation boxes (405), and the sponge filter plate (409) is plugged into the inside of the other ventilation box (405).

8. A method for screening raw materials, characterized in that: The raw material screening device according to claim 1-7 further comprises the following steps: S1, feeding the raw materials into the interior of the screening cylinder (307) through the injection nozzle (303); S2, starting the motor (302), and driving the screening net cylinder (307) to rotate by plugging the connecting plug block (309) and the connecting socket (310) into each other; S3, during the rotation of the screening cylinder (307), the raw materials meeting the production requirements are thrown out of the screening cylinder (307) by centrifugal force, and the raw materials meeting the production requirements naturally slide into the containing tank (401); S4, starting the electric heating tube (403), the fan (407) and the electric heating rod (408) in sequence, the electric heating tube (403) directly heats the containing tank (401) to dry the raw materials inside the containing tank, and the fan (407) extracts air from the outside, and the extracted air is heated by the electric heating rod (408) and then sprayed toward the raw materials inside the containing tank (401) to further dry them; S5. When the screening net drum (307) rotates, it also drives the rotating shaft (410) to rotate, so that the raw materials inside the containing tank (401) are stirred and turned through the mixing rod (411) outside the rotating shaft (410), thereby ensuring the drying quality and drying efficiency; S6. After the raw materials are dried, they leave the screening box (1) through the discharge pipe (404).

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