A screening machine

Abstract

The present invention provides a screening machine, comprising: a frame; a feeding mechanism, including a feeding driving device and a feeding tray; the feeding tray is connected to the output end of the feeding driving device; a screening mechanism, including a screening driving device and a screening assembly; the screening assembly includes a screening support, a dust screen and a first screen; the screening support is fixedly connected to the output end of the screening driving device; the dust screen is fixedly connected to the screening support; the first screen is fixedly connected to the screening support; a dust collection mechanism, including a first suction hood; a control device, which is respectively communicatively connected to the feeding driving device and the screening driving device. The feeding mechanism and the screening mechanism are controlled by the control device to work. The feeding mechanism sends the material to be screened onto the screening assembly, and the screening assembly screens dust, material heads and qualified products respectively, realizing automatic screening, improving efficiency, and reducing labor intensity and labor costs.

Description

Technical Field

[0001] The present invention relates to the technical field of screening, and in particular to a screening machine. Background Art

[0002] In the semiconductor industry, during the production process of capacitors, sheet materials are cut into individual capacitors. Due to the generation of powder and waste materials during the cutting process, the cut capacitors are contaminated with powder and mixed with useless waste materials. Therefore, the cut capacitors need to be screened to remove the powder and waste materials.

[0003] Currently, the traditional method of removing powder and waste materials is to manually screen them using a sieve tray, which is inefficient, labor-intensive, and usually requires multiple people to operate to meet the production schedule, resulting in high labor costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a screening machine that can achieve automated screening, improve efficiency, and reduce labor intensity and labor costs.

[0005] The present invention is implemented as follows: A screening machine includes:

[0006] A frame;

[0007] A feeding mechanism, including a feeding drive device and a feeding tray; the feeding drive device is connected to the frame; the feeding tray is connected to the output end of the feeding drive device;

[0008] A screening mechanism, including a screening drive device and a screening component; the screening drive device is connected to the frame; the screening component includes a screening support, a dust screen, and a first screen; the screening support is fixedly connected to the output end of the screening drive device; the dust screen is fixedly connected to the screening support and is located below the outlet of the feeding tray; the first screen is fixedly connected to the screening support and is located behind the dust screen and not higher than the dust screen;

[0009] A dust collection mechanism, including a first suction hood; the first suction hood is arranged at the bottom of the dust screen and covers the dust screen below;

[0010] A control device, which is communicatively connected to the feeding drive device and the screening drive device respectively.

[0011] Furthermore, the feeding mechanism further includes:

[0012] A hopper support, fixedly connected to the frame;

[0013] A hopper, fixedly connected to the hopper support and having an outlet located above the feeding tray.

[0014] Further, the feeding mechanism further includes:

[0015] A discharge baffle, fixedly connected to the hopper bracket and located above the feeding tray.

[0016] Further, a plurality of first arc-shaped material grooves are formed on the feeding tray, and the first arc-shaped material grooves are arranged along the feeding direction of the feeding tray.

[0017] Further, the screening component further includes:

[0018] A second screen, fixedly connected to the screening bracket and located below the first screen;

[0019] A first discharge hopper, fixedly connected to the screening bracket and located below the second screen;

[0020] A second discharge hopper, fixedly connected to the screening bracket and located below the end outlets of the first screen and the second screen.

[0021] Further, it further includes:

[0022] A first material frame, placed below the first discharge hopper;

[0023] A second material frame, placed below the second discharge hopper.

[0024] Further, the screening mechanism further includes a gas dust removal component;

[0025] The gas dust removal component includes:

[0026] A feeding inclined plate, with a first suction port formed at the upper end, fixedly connected to the bottom of the feeding tray, and the bottom end located above the dust screen;

[0027] A sealing plate, provided with a second suction port; the sealing plate is fixedly connected between the feeding inclined plate and the feeding tray, and the bottom end of the sealing plate is located obliquely below the first suction port; the first suction port and the second suction port are connected;

[0028] There are two inclined side baffles, fixedly connected to the inclined sides of the feeding inclined plate one by one, and the two inclined side baffles, the feeding tray and the feeding inclined plate form a cavity, and the first suction port and the second suction port are respectively the air ports of the cavity;

[0029] A second suction hood, fixedly connected to the bottom of the feeding inclined plate and covering the first suction port;

[0030] A pneumatic knife bracket, fixedly connected to the machine frame;

[0031] The air knife includes an air inlet and an air outlet that are interconnected; the air knife is fixedly connected to the air knife bracket, and the air outlet faces the sealing plate or the feeding inclined plate;

[0032] The soft curtain is fixedly connected to the air knife bracket, is located above the feeding tray, and has a gap with the top surface of the feeding tray.

[0033] Furthermore, the feeding inclined plate is further provided with a plurality of second arc-shaped material grooves arranged in parallel, and each of the second arc-shaped material grooves is arranged obliquely downward.

[0034] Furthermore, the dust collection mechanism further includes:

[0035] A dust collection bucket, which is hermetically connected to the first suction hood and the second suction hood;

[0036] A suction driving device, the output end of which is hermetically connected to the dust collection bucket and is communicatively connected to the control device.

[0037] Furthermore, it further includes:

[0038] A pressure regulating valve, which is hermetically connected to the air inlet and is communicatively connected to the control device.

[0039] The present invention has the following advantages: A screening machine includes: a frame; a feeding mechanism, including a feeding driving device and a feeding tray; the feeding tray is connected to the output end of the feeding driving device; a screening mechanism, including a screening driving device and a screening component; the screening component includes a screening bracket, a dust screen and a first screen; the screening bracket is fixedly connected to the output end of the screening driving device; the dust screen is fixedly connected to the screening bracket; the first screen is fixedly connected to the screening bracket; a dust collection mechanism, including a first suction hood; a control device, which is communicatively connected to the feeding driving device and the screening driving device respectively. The feeding mechanism and the screening mechanism are controlled by the control device to work. The feeding mechanism sends the materials to be screened to the screening component, and the screening component screens the dust, the material heads and the qualified products respectively, realizing automatic screening, improving the efficiency, reducing the labor intensity and the labor cost. Description of the Drawings

[0040] The following further describes the present invention with reference to the drawings in conjunction with the embodiments.

[0041] Figure 1 It is a perspective view of a screening machine of the present invention.

[0042] Figure 2 It is a schematic internal structure of a screening machine of the present invention Figure 1 .

[0043] Figure 3 It is a schematic internal structure of a screening machine of the present inventionFigure 2 .

[0044] Figure 4 Schematic diagram of the internal structure of a screening machine according to the present invention Figure 3 .

[0045] Figure 5 Three-dimensional view of the feeding mechanism according to the present invention Figure 1 .

[0046] Figure 6 Three-dimensional view of the feeding mechanism according to the present invention Figure 2 .

[0047] Figure 7 Side view of the feeding mechanism according to the present invention.

[0048] Figure 8 is Figure 7 Cross-sectional view taken along line A-A in

[0049] Figure 9 Three-dimensional view of the feeding tray according to the present invention

[0050] Figure 10 Three-dimensional view of the feeding inclined plate according to the present invention

[0051] Figure 11 Three-dimensional view of the screening mechanism according to the present invention Figure 1 .

[0052] Figure 12 Three-dimensional view of the screening mechanism according to the present invention Figure 2 .

[0053] Figure 13 Top view of the screening mechanism according to the present invention

[0054] Figure 14 Front view of the screening mechanism according to the present invention

[0055] Figure 15 Side view of the screening mechanism according to the present invention

[0056] Figure 16 is Figure 15 Cross-sectional view taken along line B-B in

[0057] Figure 17 Blowing schematic diagram of the air knife according to the present invention

[0058] Explanation of reference numerals:[[]]

[0059] Frame 1, outer shell 11, control panel 12;

[0060] Feeding mechanism 2, feeding drive device 21, feeding tray 22, first arc-shaped chute 221, baffle 222, hopper support 23, hopper 24, discharge baffle 25;

[0061] Screening mechanism 3, screening drive device 31, screening component 32, screening support 321, dust screen 322, first screen 323, second screen 324, hopper 325, second discharge hopper 326, first material frame 33, second material frame 34, gas dust removal component 35, feeding inclined plate 351, first suction port 3511, second arc-shaped material trough 3512, sealing plate 352, second suction port 3521, bevel baffle 353, second suction hood 354, air knife support 355, column 3551, vertical adjustment hole 35511, cross bar 3552, clamping block 3553, cross plate 3554, side baffle 3555, air knife 356, air inlet 3561, air outlet 3562, soft curtain 357, cavity 36, air 37, first outlet pressure regulating valve 38;

[0062] Dust collection mechanism 4, first suction hood 41, dust collection bucket 42, first air port 421, second air port 422, suction drive device 43;

[0063] Control device 5. Detailed implementation manners

[0064] In the description of the invention, it should be understood that the description of the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the invention.

[0065] In the description of the invention, it should be noted that unless otherwise clearly defined and limited, the terms "arranged", "connected" and "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific situations.

[0066] The inventive concept of the present invention is as follows:

[0067] The feeding mechanism 2 and the screening mechanism 3 are controlled by the control device 5 to work. The feeding mechanism 2 sends the material to be screened onto the screening component 32, and the screening component 32 screens dust, material heads and qualified products respectively, realizing automatic screening, improving efficiency, reducing labor intensity and labor costs.

[0068] The dust is collected by the dust collection mechanism 4 to reduce dust emission.

[0069] Please refer to Figures 1 to 17 as shown in Figure 13As shown, the mesh openings of each sieve are too small, and only a part is shown in the figure. In specific implementation, the number of mesh openings can be arranged according to actual needs.

[0070] A screening machine, comprising:

[0071] A frame 1;

[0072] A feeding mechanism 2, including a feeding drive device 21 and a feeding tray 22; the feeding drive device 21 is connected to the frame 1; the feeding tray 22 is connected to the output end of the feeding drive device 21; in specific implementation, the feeding drive device 21 can adopt a vibrator.

[0073] A screening mechanism 3, including a screening drive device 31 and a screening component 32; the screening drive device 31 is connected to the frame 1; the screening component 32 includes a screening bracket 321, a dust sieve 322 and a first sieve 323; the screening bracket 321 is fixedly connected to the output end of the screening drive device 31; the dust sieve 322 is fixedly connected to the screening bracket 321 and is located below the outlet of the feeding tray 22; the first sieve 323 is fixedly connected to the screening bracket 321 and is located behind the dust sieve 322 and is not higher than the dust sieve 322; the dust of the material is screened by the dust sieve 322, and then the material head is screened by the first sieve 323, so as to screen out qualified products. In specific implementation, the screening drive device 31 can adopt a vibrator.

[0074] A dust collection mechanism 4, including a first suction hood 41; the first suction hood 41 is arranged at the bottom of the dust sieve 322 and covers the dust sieve 322 below; the dust falling from the dust sieve 322 enters the first suction hood 41, and by sucking the first suction hood 41, the dust is sucked away to reduce dust emission.

[0075] A control device 5 is respectively communicatively connected to the feeding drive device 21 and the screening drive device 31. In specific implementation, the control device 5 can adopt a PLC.

[0076] The feeding mechanism 2 further includes:

[0077] A hopper bracket 23, fixedly connected to the frame 1;

[0078] A hopper 24, fixedly connected to the hopper bracket 23, and the outlet is located above the feeding tray 22. The hopper 24 is convenient for adding the material to be screened to the feeding tray 22.

[0079] The feeding mechanism 2 further includes:

[0080] A discharge baffle 25 is fixedly connected to the hopper bracket 23 and positioned above the feed tray 22. A gap is defined between the discharge baffle 25 and the feed tray 22 for conveying material. The discharge baffle 25 controls the amount of material discharged, preventing excessive accumulation and facilitating subsequent screening. In practice, the discharge amount from the feed tray 22 can be controlled by adjusting the height of the discharge baffle 25, i.e., the size of the gap.

[0081] The feed tray 22 is provided with a plurality of parallel first arc-shaped troughs 221, and the first arc-shaped troughs 221 are arranged along the feeding direction of the feed tray 22. The first arc-shaped troughs 221 have two functions: one is to guide the conveyed material; the other is that the arc-shaped structure reduces the pressure on the material inside the trough, thus avoiding crushing the material. Because the main pressure on the material accumulated in the first arc-shaped trough 221 is the gravity of the material above, the arc-shaped surface can decompose the gravity into vertical pressure and horizontal force components. Under the same conditions, the gravity of the material above can be decomposed, thereby reducing the vertical pressure. For example, in a specific embodiment, the size of the capacitor is approximately: a cube with a side length of 0.3mm, which is very small. If the pile is too thick, the capacitors at the bottom are more likely to be crushed. The discharge baffle 25 can be placed on the top surface of the feed tray 22. The gap between the two is the first arc-shaped trough 221, which is the discharge channel, which can minimize the accumulation of too thick materials.

[0082] In a specific embodiment, baffles 222 are respectively provided on three sides of the feeding tray 22 for blocking the material, leaving one side as the terminal discharge port.

[0083] The screening assembly 32 further comprises:

[0084] The second screen 324 is fixedly connected to the screening bracket and is located below the first screen 323; it can perform secondary screening to improve the screening accuracy.

[0085] The first discharge hopper 325 is fixedly connected to the screening support and is located below the second screen 324; it can guide the material to facilitate collection and avoid splashing everywhere.

[0086] The second discharge hopper 326 is fixedly connected to the screening support and is located below the end outlets of the first screen 323 and the second screen 324. The material can be guided to facilitate collection and avoid splashing.

[0087] Also includes:

[0088] The first material frame 33 is placed below the first discharge hopper 325;

[0089] The second material frame 34 is placed below the second discharge hopper 326 .

[0090] In a specific embodiment, the size of the stock head is larger than the size of the qualified product. The mesh holes of the dust screen 322 are smaller than the sizes of the stock head and the qualified product; the mesh holes of the first screen 323 and the second screen 324 are larger than the size of the qualified product and smaller than the size of the stock head; the material is conveyed from the feeding tray 22 and dropped onto the dust screen 322, where the powder is first screened out, and then undergoes the first screening through the first screen 323. The stock head drops from the end of the first screen 323 into the first discharge hopper 325 and finally into the first material frame 33; while the qualified product drops onto the second screen 324 for secondary screening. The stock head screened out by the second screen 324 drops from the end of the second screen 324 into the first material frame 33, and the finally screened qualified product drops from the second screen 324 into the second discharge hopper 326 and finally into the second material frame 34.

[0091] It should be noted that during capacitor cutting, the size of the stock head can be artificially preset in advance and is controllable, so that there is a difference between its size and the size of the qualified product, and the size of the qualified product is also known. Thus, screening is carried out through the screen.

[0092] The screening mechanism 3 further includes a gas dust removal component 35; the material output from the feeding tray 22 is first subjected to gas dust removal through the gas dust removal component 35 to reduce the dust in the material, which can reduce the cleaning frequency of the dust screen 322. Because in actual production, the dust screen 322 uses vibratory screening. After being used for a period of time, dust will adhere to the dust screen 322, easily blocking the mesh holes and reducing the screening accuracy. Therefore, it is necessary to stop the machine for cleaning. By using the gas dust removal component 35 to perform gas dust removal first, the amount of dust entering the dust screen 322 can be reduced, the service life can be extended, the frequency of cleaning the screen can be reduced, and thus the production efficiency can be improved.

[0093] The gas dust removal component 35 includes:

[0094] A feeding inclined plate 351, with a first air suction port 3511 opened at the upper end, fixedly connected to the bottom of the feeding tray 22, and the bottom end located above the dust screen 322;

[0095] A sealing plate 352, with a second air suction port 3521 opened; the sealing plate 352 is fixedly connected between the feeding inclined plate 351 and the feeding tray 22, and the bottom end of the sealing plate 352 is located obliquely below the first air suction port 3511; the first air suction port 3511 and the second air suction port 3521 are connected;

[0096] There are two bevel baffles 353, which are fixedly connected to the bevel of the feeding bevel plate 351 in a one-to-one correspondence. The two bevel baffles 353, the feeding tray 22 and the feeding bevel plate 351 form a cavity 36, and the first air suction port 3511 and the second air suction port 3521 are respectively the air ports of the cavity 36;

[0097] The second air suction hood 354 is fixedly connected to the bottom of the feeding bevel plate 351 and covers the first air suction port 3521;

[0098] The air knife support 355 is fixedly connected to the frame 1;

[0099] The air knife 356 includes an air inlet 3561 and an air outlet 3562 that are interconnected; the air knife 356 is fixedly connected to the air knife support 355, and the air outlet 3562 faces the sealing plate 352 or the feeding bevel plate 353; as Figure 17 shown, the air 37 blows from the air outlet 3562 towards the feeding bevel plate 351 or the sealing plate 352 direction to blow and remove dust from the material. The air pressure can be preset by adjusting the air pressure input into the air inlet 3561, so that dust can be removed without blowing the product into the second air suction port 3521 and being sucked away. On the other hand, the second air suction hood 354 is evacuated, and the dust is sucked into the cavity 36 from the second air suction port 3521, then enters the second air suction hood 354 from the first air suction port 3511, and is finally sucked away; here, part of the dust of the material to be screened can be blown off through gas dust removal.

[0100] The soft curtain 357 is fixedly connected to the air knife support 355 and is located above the feeding tray 22, and there is a gap between the soft curtain 357 and the top surface of the feeding tray 22, and this gap serves as the conveying channel for the material. In a specific implementation, the feeding tray 22 is provided with a first arc-shaped material trough 221. At this time, the soft curtain 357 can be placed on the top surface of the feeding tray 22, and the first arc-shaped material trough 221 is the gap and serves as the conveying channel for the material.

[0101] In a specific embodiment, the air knife 356 can be an existing one.

[0102] The air knife support 355 includes two columns 3551, a cross bar 3552 and two clamping blocks 3553; the air knife 356 is locked to the cross bar 3552 by screws; both ends of the cross bar 3552 are inserted into one of the clamping blocks 3553, and rotating the cross bar 3552 can adjust the blowing angle of the air knife 356, and locking the clamping block 3553 can fix the cross bar 3552; the clamping block 3553 is locked into the vertical adjustment hole 35511 of the column 3551 by screws, and the height of the clamping block 3553 can be adjusted, thereby adjusting the height of the air knife 356, and finally adjusting the position of the air knife 356 to the required position.

[0103] As Figure 12 and Figure 13 shown, the soft curtain 357 is fixed on a horizontal plate 3554; the horizontal plate 3554 is fixed on the two columns 3551; side baffles 3555 are respectively arranged on both sides of the soft curtain 357 to block the sides and prevent dust from blowing out from the sides.

[0104] The feeding inclined plate 351 is further provided with a plurality of second arc-shaped material grooves 3512 arranged in parallel, and each of the second arc-shaped material grooves 3512 is arranged obliquely downward. The function of the second arc-shaped material groove 3512 is the same as that of the first arc-shaped material groove 221.

[0105] The dust collection mechanism 4 further includes:

[0106] A dust collection bucket 42, which is airtight and communicated with the first suction hood 41 and the second suction hood 354; in a specific embodiment, the dust collection bucket 42 is provided with a first air port 421 and a second air port 422, the first air port 421 is airtight and connected with the first suction hood 41 and the second suction hood 354 through a pipeline, and the second air port 422 is airtight and connected with the suction driving device 43 through a pipeline.

[0107] A suction driving device 43, the output end of which is airtight and communicated with the dust collection bucket 42 and is communicatively connected to the control device 5. In a specific implementation, the suction driving device 43 can adopt a suction device such as a blower or a vacuum pump.

[0108] The dust removal principle is: the suction driving device 43 first sucks the dust collection bucket 42, and then transfers it to the first suction hood 41 and the second suction hood 354, the dust is sucked from the first suction hood 41 and the second suction hood 354 and then enters the dust collection bucket 42 to collect the dust.

[0109] It further includes:

[0110] A pressure regulating valve 38, which is airtight and connected to the air inlet and is communicatively connected to the control device. The air pressure entering the air knife 356 can be pre-adjusted and set through the pressure regulating valve.

[0111] Usage method:

[0112] The control device 5 can adopt a PLC.

[0113] The feeding driving device 21 adopts a vibrator. The screening driving device 31 also adopts a vibrator, such as a linear vibrator.

[0114] The air suction driving device 43 can adopt a blower. The blower is controlled by a frequency converter to adjust the suction force of the blower to the required magnitude, so that dust can be sucked from the first suction hood 41 and the second suction hood 354, and the product will not be sucked away. In specific implementation, the PLC is communicatively connected to the frequency converter, and the frequency converter is communicatively connected to the blower.

[0115] The air pressure of the air knife 356 and the magnitude of the suction force of the air suction driving device 43 are preset.

[0116] The size of the stock head is larger than the size of the qualified product. The mesh holes of the dust screen 322 are smaller than the sizes of the stock head and the qualified product. The mesh holes of the first screen 323 and the second screen 324 are larger than the size of the qualified product and smaller than the size of the stock head. Each screen can adopt a woven screen; or a plate can be drilled to form mesh holes.

[0117] The working procedure is preset.

[0118] During production, the control device 5 controls the feeding driving device 21, the screening driving device 31 and the air suction driving device 43 to start working;

[0119] The material to be screened is fed into the hopper 24, then falls into the feeding tray 22, and the feeding driving device 21 vibrates and conveys the material to be screened and drops it onto the feeding inclined plate 351. The air knife 356 blows the material to be screened to blow out part of the dust. The air suction driving device 43 sucks the dust from the second air suction port 3521 into the cavity 36, then enters the second suction hood 354 from the first air suction port 3511, and is finally sucked into the dust collection bucket 42 for storage;

[0120] The material drops from the feeding inclined plate 351 onto the dust screen 322. The screening driving device 31 drives the screening support 321 to vibrate, and then drives the dust screen 322, the first screen 323 and the second screen 324 to vibrate. The material is first further screened and dust removed by the dust screen 322. The dust falls into the first suction hood 41 below and is sucked into the dust collection bucket 42. Inevitably, dust will be generated during the gas dust removal and vibration dust removal processes. The present invention minimizes the dust generation through the soft curtain 357, the side baffle 3555, the suction hood method, etc.;

[0121] Then the material enters the first screen 323 for the first screening. The stock head drops from the end of the first screen 323 into the first discharge hopper 325 and finally into the first material frame 33; while the qualified products drop onto the second screen 324 for secondary screening. The stock head screened out by the second screen 324 drops from the end of the second screen 324 into the first material frame 33, and the finally screened qualified products drop from the second screen 324 into the second discharge hopper 326 and finally into the second material frame 34.

[0122] In specific implementation, such asFigure 1 As shown, a housing 11 can also be provided on the frame 1 to enclose each mechanism, which can not only play a role in safety protection, but also further limit the dust within the screening machine. The control panel 12 can also be arranged on the housing 11 for convenient operation.

[0123] Although the specific embodiments of the present invention have been described above, those skilled in the art of this technology should understand that the specific embodiments we described are only illustrative and not used to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered by the scope protected by the claims of the present invention.

Claims

1. A screening machine, characterized in that: include: frame; Feeding mechanism, including a feeding drive device and a feeding tray; The feeding drive device is connected to the frame; The feeding tray is connected to the output end of the feeding drive device; The screening mechanism comprises a screening drive device and a screening assembly; the screening drive device is connected to the frame; the screening assembly comprises a screening bracket, a dust screen and a first screen; the screening bracket is fixedly connected to the output end of the screening drive device; the dust screen is fixedly connected to the screening bracket and is located below the outlet of the feed tray; the first screen is fixedly connected to the screening bracket and is located behind the dust screen and is not higher than the dust screen; The dust collecting mechanism includes a first air suction hood; the first air suction hood is arranged at the bottom of the dust screen and covers the dust screen from below; A control device, respectively connected to the feeding drive device and the screening drive device for communication; The screening mechanism also includes a gas dust removal component; The gas dust removal assembly comprises: A feeding inclined plate, having a first air inlet at its upper end and fixedly connected to the bottom of the feeding tray, with its bottom end located above the dust screen; A sealing plate is provided with a second air inlet; the sealing plate is fixedly connected between the feed inclined plate and the feed tray, and the bottom end of the sealing plate is located obliquely below the first air inlet; the first air inlet and the second air inlet are in communication; There are two bevel baffles, which are fixedly connected to the bevel of the feed inclined plate in a one-to-one correspondence, and the two bevel baffles, the feed tray and the feed inclined plate form a cavity, and the first air intake and the second air intake are respectively the air outlets of the cavity; a second air suction hood, fixedly connected to the bottom of the feed inclined plate and covering the first air suction hood; an air knife bracket, fixedly connected to the frame; An air knife, comprising an air inlet and an air outlet that are interconnected; the air knife is fixedly connected to the air knife bracket, and the air outlet faces the sealing plate or the feed inclined plate; A soft curtain is fixedly connected to the air knife bracket and is located above the feeding tray with a gap between it and the top surface of the feeding tray; The feeding mechanism further comprises: A hopper bracket, fixedly connected to the frame; The hopper is fixedly connected to the hopper bracket, and the outlet is located above the feeding tray.

2. A screening machine according to claim 1, characterized in that: The feeding mechanism further comprises: A discharge baffle is fixedly connected to the hopper bracket and is located above the feed tray.

3. A screening machine according to claim 1, characterized in that: The feeding tray is provided with a plurality of first arc-shaped troughs arranged in parallel, and the first arc-shaped troughs are arranged along the feeding direction of the feeding tray.

4. A screening machine according to claim 1, characterized in that: The screening assembly further comprises: a second screen, fixedly connected to the screening support and located below the first screen; a first discharge hopper fixedly connected to the screening support and located below the second screen; The second discharge hopper is fixedly connected to the screening bracket and is located below the terminal outlets of the first screen and the second screen.

5. A screening machine according to claim 4, characterized in that: Also includes: a first material frame, disposed below the first discharge hopper; The second material frame is placed below the second discharge hopper.

6. A screening machine according to claim 1, characterized in that: The feed inclined plate is further provided with a plurality of second arc-shaped troughs arranged in parallel, and each of the second arc-shaped troughs is arranged obliquely downward.

7. A screening machine according to claim 1, characterized in that: The dust collecting mechanism further comprises: A dust collecting bucket, which is in airtight communication with the first suction hood and the second suction hood; The air suction drive device has an output end that is in airtight communication with the dust collecting bucket and is communicatively connected to the control device.

8. A screening machine according to claim 1, characterized in that: Also includes: The pressure regulating valve is air-tightly connected to the air inlet and is communicatively connected to the control device.

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