CN217700139U - Screening machine - Google Patents

Abstract

The utility model provides a screening machine, include: a frame; the feeding mechanism comprises a feeding driving device and a feeding disc; the feeding disc is connected to the output end of the feeding driving device; the screening mechanism comprises a screening driving device and a screening assembly; the screen assembly comprises a screen 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; the dust collecting mechanism comprises a first air suction cover; and the control device is in communication connection with the feeding driving device and the screening driving device respectively. The control device controls the feeding mechanism and the screening mechanism to work, the feeding mechanism sends materials to be screened to the screening assembly, and the screening assembly screens dust, stub bars and qualified products respectively, so that automatic screening is realized, the efficiency is improved, and the labor intensity and the labor cost are reduced.

Description

Screening machine

Technical Field

The utility model relates to a screening technique field, especially a sieve separator.

Background

In the semiconductor industry, in the production process of capacitors, a piece of sheet material is cut into capacitors with one piece, and powder and stub bars are generated in the cutting process, so that the cut capacitors are stained with the powder and mixed with useless stub bars. Therefore, the cut capacitor needs to be sieved to remove powder and stub bars.

And the current powder and stub bar of getting rid of still adopt traditional manual work to sieve with the sieve tray, and is inefficient, and intensity of labour is big, and usually in order to satisfy the production progress, needs many people to operate, and the cost of labor is big.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a sieve separator, realizes automatic screening, raises the efficiency, reduces intensity of labour and human cost.

The utility model discloses a realize like this: a screening machine comprising:

a frame;

the feeding mechanism comprises a feeding driving device and a feeding disc; the feeding driving device is connected to the rack; the feeding disc is connected to the output end of the feeding driving device;

the screening mechanism comprises a screening driving device and a screening assembly; the screening driving device is connected to the frame; the screen assembly comprises a screen 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 and is positioned below the outlet of the feeding plate; the first screen is fixedly connected to the screening bracket, is positioned behind the dust screen and is not higher than the dust screen;

the dust collecting mechanism comprises a first air suction cover; the first gas suction cover is arranged at the bottom of the dust screen and covers the dust screen below the first gas suction cover;

and the control device is in communication connection with the feeding driving device and the screening driving device respectively.

Further, the feeding mechanism further comprises:

the hopper bracket is fixedly connected to the rack;

the hopper is fixedly connected to the hopper support, and the outlet is located above the feeding plate.

Further, the feeding mechanism still includes:

and the discharge baffle is fixedly connected to the hopper bracket and is positioned above the feeding plate.

Furthermore, a plurality of first arc-shaped material grooves which are arranged in parallel are formed in the feeding plate, and the first arc-shaped material grooves are arranged along the feeding direction of the feeding plate.

Further, the screen assembly further includes:

the second screen is fixedly connected to the screening bracket and is positioned below the first screen;

the first discharging hopper is fixedly connected to the screening bracket and is positioned below the second screen;

and the second discharge hopper is fixedly connected to the screening support and is positioned below the outlets at the tail ends of the first screen and the second screen.

Further, the method also comprises the following steps:

the first material frame is arranged below the first discharging hopper;

and the second material frame is arranged below the second discharging hopper.

Further, the screening mechanism further comprises a gas dust removal assembly;

the gas dust removal assembly comprises:

the upper end of the feeding inclined plate is provided with a first air suction port and is fixedly connected with the bottom of the feeding plate, and the bottom end of the feeding inclined plate is positioned above the dust screen;

the closing plate is provided with a second air suction port; the sealing plate is fixedly connected between the feeding inclined plate and the feeding disc, and the bottom end of the sealing plate is positioned obliquely below the first air suction port; the first air suction port is communicated with the second air suction port;

the two bevel edge baffles are fixedly connected to the bevel edges of the feeding inclined plate in a one-to-one correspondence manner, the two bevel edge baffles, the feeding disc and the feeding inclined plate form a cavity, and the first air suction port and the second air suction port are air ports of the cavity respectively;

the second air suction cover is fixedly connected to the bottom of the feeding inclined plate and covers the first air suction port;

the air knife bracket is fixedly connected to the rack;

the air knife comprises an air inlet and an air outlet which are communicated with each other; the air knife is fixedly connected to the air knife bracket, and the air outlet faces the sealing plate or the feeding inclined plate;

and the soft curtain is fixedly connected to the air knife bracket and positioned above the feeding plate, and a gap is formed between the soft curtain and the top surface of the feeding plate.

Furthermore, a plurality of second arc-shaped material grooves which are arranged in parallel are further formed in the feeding inclined plate, and the second arc-shaped material grooves are obliquely and downwards arranged.

Further, the dust collecting mechanism further includes:

the dust collection barrel is communicated with the first air suction cover and the second air suction cover in an air-tight way;

and the output end of the air suction driving device is communicated with the dust collecting barrel in an air-tight manner and is in communication connection with the control device.

Further, still include:

and the pressure regulating valve is connected with the air inlet in an airtight manner and is in communication connection with the control device.

The utility model has the advantages of as follows: a screening machine comprising: a frame; the feeding mechanism comprises a feeding driving device and a feeding disc; the feeding disc is connected to the output end of the feeding driving device; the screening mechanism comprises a screening driving device and a screening assembly; the screen assembly comprises a screen 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; the dust collecting mechanism comprises a first air suction cover; and the control device is in communication connection with the feeding driving device and the screening driving device respectively. The control device controls the feeding mechanism and the screening mechanism to work, the feeding mechanism sends materials to be screened to the screening assembly, and the screening assembly screens dust, stub bars and qualified products respectively, so that automatic screening is realized, the efficiency is improved, and the labor intensity and the labor cost are reduced.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

Fig. 1 is a perspective view of the screening machine of the present invention.

Fig. 2 is the internal structure schematic diagram of the screening machine of the present invention.

Fig. 3 is a schematic diagram of an internal structure of the screening machine of the present invention.

Fig. 4 is a schematic diagram of the internal structure of the screening machine of the present invention.

Fig. 5 is a first perspective view of the feeding mechanism of the present invention.

Fig. 6 is a second perspective view of the feeding mechanism of the present invention.

Fig. 7 is a side view of the feeding mechanism of the present invention.

Fig. 8 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 7.

Fig. 9 is a perspective view of the feed tray of the present invention.

Fig. 10 is a perspective view of the inclined feeding plate of the present invention.

Fig. 11 is a first perspective view of the sieving mechanism of the present invention.

Fig. 12 is a second perspective view of the sieving mechanism of the present invention.

Fig. 13 is a top view of the sifting mechanism of the present invention.

Fig. 14 is a front view of the sifting mechanism of the present invention.

Fig. 15 is a side view of the sifting mechanism of the present invention.

Fig. 16 is a sectional view taken along line B-B in fig. 15.

Figure 17 is a blow schematic of an air knife of the present invention.

Description of reference numerals:

the device comprises a frame 1, a shell 11 and a control panel 12;

the feeding mechanism 2, the feeding driving device 21, the feeding tray 22, the first arc-shaped trough 221, the baffle 222, the hopper support 23, the hopper 24 and the discharging baffle 25;

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

a dust collecting mechanism 4, a first air suction cover 41, a dust collecting barrel 42, a first air port 421, a second air port 422 and an air suction driving device 43;

and a control device 5.

Detailed Description

In the description of the present invention, it should be understood that the description indicating the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed", "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the utility model can be understood in specific cases to those of ordinary skill in the art.

The utility model discloses a design as follows:

control feeding mechanism 2 and screening mechanism 3 by controlling means 5 and carry out work, feeding mechanism 2 will wait to screen on the material sends screening subassembly 32, and screening subassembly 32 sieves dust, stub bar and qualified product respectively, realizes automatic screening, raises the efficiency, reduces intensity of labour and human cost.

Dust is collected through the dust collection mechanism 4, and dust emission is reduced.

Please refer to fig. 1 to 17. As shown in fig. 13, the mesh size of each screen is too small, only a portion of which is shown, and in particular embodiments, the number of meshes may be arranged as desired.

A screening machine comprising:

a frame 1;

the feeding mechanism 2 comprises a feeding driving device 21 and a feeding tray 22; the feeding driving device 21 is connected to the frame 1; the feeding tray 22 is connected to the output end of the feeding driving device 21; in a specific implementation, the feeding driving device 21 may adopt a vibrator.

The screening mechanism 3 comprises a screening driving device 31 and a screening assembly 32; the screening driving device 31 is connected to the frame 1; the screen assembly 32 includes a screen carrier 321, a dust screen 322 and a first screen 323; the screening bracket 321 is fixedly connected to the output end of the screening driving device 31; the dust screen 322 is fixedly connected to the screening bracket 321 and is located below the outlet of the feeding tray 22; the first screen 323 is fixedly connected to the screening bracket 321, is positioned behind the dust screen 322, and is not higher than the dust screen 322; the material is subjected to dust screening through the dust screen 322, and the stub bar is screened through the first screen 323, so that qualified products are screened out. In a specific implementation, the screening drive 31 may be a vibrator.

A dust collection mechanism 4 including a first suction hood 41; the first gas suction hood 41 is arranged at the bottom of the dust screen 322 and covers the dust screen 322 at the lower part; the dust screened and dropped from the dust screen 322 enters the first air suction hood 41, and the first air suction hood 41 is sucked to suck away the dust, so that the dust emission is reduced.

And the control device 5 is respectively in communication connection with the feeding driving device 21 and the screening driving device 31. In a specific implementation, the control device 5 may employ a PLC.

The feeding mechanism 2 further comprises:

the hopper bracket 23 is fixedly connected to the frame 1;

and the hopper 24 is fixedly connected to the hopper support 23, and the outlet of the hopper is positioned above the feeding tray 22. The hopper 24 facilitates the addition of material to be screened to the feed tray 22.

The feeding mechanism 2 further comprises:

and the discharge baffle plate 25 is fixedly connected to the hopper bracket 23 and is positioned above the feed tray 22. And a gap is formed between the discharge baffle 25 and the feed tray 22 for conveying materials. The discharge baffle 25 is used for controlling the discharge amount, so that the material accumulation is avoided, the subsequent screening is facilitated, and in the specific implementation, the discharge amount of the feeding tray 22 can be controlled by controlling the height of the discharge baffle 25, namely the size of the gap.

A plurality of first arc-shaped material grooves 221 which are arranged in parallel are formed in the feeding tray 22, and the first arc-shaped material grooves 221 are arranged along the feeding direction of the feeding tray 22. The first arc-shaped trough 221 has two functions, namely guiding conveyed materials; secondly, the arc-shaped structure enables the pressure on the materials in the groove to be smaller, and the materials are prevented from being crushed, because the pressure on the materials stacked in the first arc-shaped material groove 221 is the gravity of the materials above, the gravity can be decomposed into vertical pressure and horizontal component force by the arc-shaped surface, and under the same condition, the gravity of the materials above is decomposed, so that the vertical pressure can be reduced. As in a specific embodiment, the capacitance is approximately: 0.3mm side length cubes, which are small, are more susceptible to crushing as the underlying capacitor is stacked too thick. The discharge baffle 25 can be put on the top surface of the feed tray 22, and the gap between the discharge baffle and the feed tray is the first arc-shaped trough 221, namely a discharge channel, so that the material accumulation can be avoided as much as possible.

In a specific embodiment, baffles 222 are disposed on three sides of the feeding tray 22, respectively, for blocking the material, and one side is used as a terminal discharge port.

The screen assemblies 32 further include:

a second screen 324 fixedly attached to the screen support and positioned below the first screen 323; and secondary screening can be performed, and the screening precision is improved.

A first discharge hopper 325 fixedly connected to the screening support and positioned below the second screen 324; the material can be guided, so that the material can be conveniently collected and prevented from splashing everywhere.

And a second discharge hopper 326 fixedly connected to the screening frame and positioned below the end outlets of the first screen 323 and the second screen 324. The material can be guided, so that the material can be conveniently collected and prevented from splashing everywhere.

Further comprising:

a first material frame 33 disposed below the first discharge hopper 325;

and the second material frame 34 is arranged below the second discharging hopper 326.

In a particular embodiment, the size of the slug is larger than the size of the acceptable product. The mesh of the dust screen 322 is smaller than the size of the stub bar and the qualified product; the meshes of the first screen 323 and the second screen 324 are larger than the size of qualified products and smaller than the size of a stub bar; the material is conveyed from the feed tray 22 and falls onto the dust screen 322, the powder is firstly screened out, then the material is firstly screened by the first screen 323, the stub bar falls into the first discharging hopper 325 from the tail end of the first screen 323, and finally falls into the first material frame 33; the qualified products fall to the second screen 324 for secondary screening, the head of the material screened by the second screen 324 falls from the end of the second screen 324 to the first material frame 33, and the qualified products finally screened fall from the second screen 324 to the second discharge hopper 326 and finally fall to the second material frame 34.

It should be explained that: during capacitive cutting, the size of the stub bar can be preset manually and controlled, so that the stub bar is different from the size of a qualified product, and the size of the qualified product is also known, so that screening is performed through a screen.

The screening mechanism 3 further comprises a gas dust removal assembly 35; the material output by the feeding tray 22 is firstly subjected to gas dust removal through the gas dust removal component 35, so that dust in the material is reduced, and the cleaning frequency of the dust screen 322 can be reduced. Because the dust screen 322 is vibrated and screened in actual production, dust can adhere to the dust screen 322 after a period of use, and meshes are easily blocked, so that the screening precision is reduced, and therefore, the machine is required to be stopped for cleaning. And adopt gas dust removal subassembly 35 to remove dust earlier, can reduce the dust volume that gets into dust screen 322, the extension live time reduces the frequency of washing the screen cloth to improve production efficiency.

The gas dust removal assembly 35 includes:

the upper end of the feeding inclined plate 351 is provided with a first air suction port 3511 and is fixedly connected with the bottom of the feeding tray 22, and the bottom end of the feeding inclined plate is positioned above the dust screen 322;

the sealing plate 352 is provided with a second air inlet 3521; the sealing plate 352 is fixedly connected between the inclined feeding plate 351 and the feeding tray 22, and the bottom end of the sealing plate 352 is positioned obliquely below the first air suction port 3511; the first air inlet 3511 is communicated with the second air inlet 3521;

two bevel edge baffles 353 are fixedly connected to the bevel edges of the feeding inclined plate 351 in a one-to-one correspondence manner, the two bevel edge baffles 353, the feeding disc 22 and the feeding inclined plate 351 form a cavity 36, and the first air suction port 3511 and the second air suction port 3521 are air ports of the cavity 36 respectively;

a second suction cover 354 fixedly connected to the bottom of the inclined feeding plate 351 and covering the first suction port 3521;

an air knife bracket 355 fixedly connected to the frame 1;

an air knife 356 comprising an air inlet 3561 and an air outlet 3562 in communication with each other; the air knife 356 is fixedly connected to the air knife bracket 355, and the air outlet 3562 faces the sealing plate 352 or the feeding inclined plate 353; as shown in fig. 17, the air 37 blows from the air outlet 3562 to the direction of the inclined feeding plate 351 or the sealing plate 352 to blow air for dust removal, and the air pressure can be preset by adjusting the air pressure input to the air inlet 3561, so that dust removal can be achieved without blowing the product into the second air inlet 3521 and being sucked away. On the other hand, the second suction hood 354 is evacuated, and the dust is sucked into the cavity 36 through the second suction port 3521, enters the second suction hood 354 through the first suction port 3511, and is finally sucked away; the material to be sieved can be dedusted here by means of a gas, from which part of the dust is blown off.

A soft curtain 357 fixedly connected to the air knife support 355 and located above the feed tray 22, and having a gap with the top surface of the feed tray 22, the gap serving as a material conveying passage. In a specific implementation, the feeding tray 22 is provided with a first arc-shaped trough 221, and at this time, the soft curtain 357 can be lapped on the top surface of the feeding tray 22, and the first arc-shaped trough 221 is a gap and serves as a conveying channel of the material.

In a specific embodiment, the air knife 356 may be conventional.

The air knife bracket 355 comprises two upright posts 3551, a cross bar 3552 and two clamping blocks 3553; air knife 356 is secured to the cross bar 3552 by screws; the two ends of the cross bar 3552 are respectively inserted into the clamp blocks 3553, the blowing angle of the air knife 356 can be adjusted by rotating the cross bar 3552, and the cross bar 3552 can be fixed by locking the clamp blocks 3553; the clamp block 3553 is screwed into the vertical adjustment hole 35511 of the upright post 3551, so that the height of the clamp block 3553 can be adjusted, the height of the air knife 356 can be adjusted, and finally the position of the air knife 356 can be adjusted to be required.

As shown in fig. 12 and 13, the soft curtain 357 is fixed to a horizontal plate 3554; the transverse plate 3554 is fixed on the two upright posts 3551; side baffles 3555 are respectively arranged on two sides of the soft curtain 357 to block the side surfaces and prevent dust from blowing out of the side surfaces.

The inclined feeding plate 351 is further provided with a plurality of second arc-shaped troughs 3512 which are arranged in parallel, and each second arc-shaped trough 3512 is obliquely and downwards arranged. The second arc-shaped trough 3512 acts as the first arc-shaped trough 221.

The dust collection mechanism 4 further includes:

a dust collecting barrel 42 which is communicated with the first air suction cover 41 and the second air suction cover 354 in an air-tight way; in a specific embodiment, the dust collecting barrel 42 is provided with a first air port 421 and a second air port 422, the first air port 421 is connected to the first suction cover 41 and the second suction cover 354 in an air-tight manner through a pipe, and the second air port 422 is connected to the suction driving device 43 in an air-tight manner through a pipe.

And the output end of the air suction driving device 43 is in air-tight communication with the dust collection barrel 42 and is in communication connection with the control device 5. In a specific implementation, the suction driving device 43 may employ a blower, a vacuum pump, or other suction devices.

The dust removal principle is as follows: the suction driving device 43 sucks the dust collecting barrel 42, and then transmits the sucked dust to the first suction hood 41 and the second suction hood 354, and the dust is sucked from the first suction hood 41 and the second suction hood 354 and then enters the dust collecting barrel 42 to be collected.

Further comprising:

a pressure regulating valve 38 is in gas tight connection with the gas inlet and is in communication connection with the control device. The air pressure set to enter the air knife 356 can be preset by a pressure regulating valve.

The use mode is as follows:

the control device 5 may employ a PLC.

The feed driving device 21 employs a vibrator. The screening drive 31 also employs a vibrator, such as a direct vibrator.

The suction driving device 43 may employ a blower. The air blower is controlled by the frequency converter, and the suction force of the air blower is adjusted to the required size, so that the first air suction cover 41 and the second air suction cover 354 can be subjected to air suction and dust removal, and products cannot be sucked away. In specific implementation, the PLC is in communication connection with the frequency converter, and the frequency converter is in communication connection with the blower.

The air pressure of the air knife 356 and the suction force of the suction driving device 43 are set in advance.

The size of the stub bar is larger than that of a qualified product. The mesh of the dust screen 322 is smaller than the size of the stub bar and acceptable product. The first screen 323 and the second screen 324 have a mesh size larger than the size of the acceptable product and smaller than the size of the head. Each screen can adopt a woven screen; alternatively, a plate may be used to form the mesh by drilling.

And presetting a working program.

During production, the control device 5 controls the feeding driving device 21, the screening driving device 31 and the suction driving device 43 to start;

the material to be screened is sent into the hopper 24 and then falls into the feeding tray 22, the material to be screened is conveyed and falls onto the feeding inclined plate 351 by the feeding driving device 21 in a vibrating way, the air knife 356 blows the material to be screened and blows out a part of dust, the dust is sucked into the cavity 36 from the second air suction port 3521 by the air suction driving device 43 and then enters the second air suction hood 354 from the first air suction port 3511, and finally is sucked into the dust collection barrel 42 for storage;

the material falls onto the dust screen 322 from the feeding inclined plate 351, and the screening bracket 321 is driven by the screening driving device 31 to vibrate, so as to drive the dust screen 322, the first screen 323 and the second screen 324 to vibrate; the material is further sieved and dedusted by the dust screen 322, the dust falls into the first air suction hood 41 below and is sucked into the dust collection barrel 42, and the dust inevitably generates raise dust in the processes of gas dedusting and vibration dedusting, and the raise dust is reduced as much as possible by the soft curtain 357, the side baffle 3555, each air suction hood mode and the like;

the rear materials enter a first screen 323 for primary screening, and the stub bars fall to a first discharge hopper 325 from the tail end of the first screen 323 and finally fall into a first material frame 33; the qualified products fall to the second screen 324 for secondary screening, the head of the material screened by the second screen 324 falls from the end of the second screen 324 to the first material frame 33, and the qualified products finally screened fall from the second screen 324 to the second discharge hopper 326 and finally fall to the second material frame 34.

In the specific implementation, as shown in fig. 1, a housing 11 may be further disposed on the frame 1 to enclose each mechanism, so as to achieve a safety protection effect and further limit the dust in the screening machine. The control panel 12 can be arranged on the shell 11, so that the operation and the control are convenient.

Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.

Claims (10)

1. A sieve separator which characterized in that: the method comprises the following steps:

a frame;

the feeding mechanism comprises a feeding driving device and a feeding disc; the feeding driving device is connected to the rack; the feeding disc is connected to the output end of the feeding driving device;

the screening mechanism comprises a screening driving device and a screening assembly; the screening driving device is connected to the frame; the screen assembly comprises a screen 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 and is positioned below the outlet of the feeding plate; the first screen is fixedly connected to the screening bracket, is positioned behind the dust screen and is not higher than the dust screen;

the dust collecting mechanism comprises a first air suction cover; the first air suction cover is arranged at the bottom of the dust screen and covers the dust screen below;

and the control device is in communication connection with the feeding driving device and the screening driving device respectively.

2. A screening machine according to claim 1, wherein: the feeding mechanism further comprises:

the hopper bracket is fixedly connected to the rack;

and the hopper is fixedly connected to the hopper support, and the outlet is positioned above the feeding plate.

3. A screening machine according to claim 2, wherein: the feeding mechanism further comprises:

and the discharge baffle is fixedly connected to the hopper support and is positioned above the feeding plate.

4. A screening machine according to claim 1, wherein: the feeding plate is provided with a plurality of first arc-shaped material grooves which are arranged in parallel, and the first arc-shaped material grooves are arranged along the feeding direction of the feeding plate.

5. A screening machine according to claim 1, wherein: the screen assembly further includes:

the second screen is fixedly connected to the screening bracket and is positioned below the first screen;

the first discharging hopper is fixedly connected to the screening bracket and is positioned below the second screen;

and the second discharging hopper is fixedly connected to the screening support and is positioned below the outlets at the tail ends of the first screen and the second screen.

6. A screening machine according to claim 5, wherein: further comprising:

the first material frame is arranged below the first discharging hopper;

and the second material frame is arranged below the second discharging hopper.

7. A screening machine according to claim 1, wherein: the screening mechanism further comprises a gas dust removal assembly;

the gas dust removal assembly comprises:

the upper end of the feeding inclined plate is provided with a first air suction port and is fixedly connected with the bottom of the feeding plate, and the bottom end of the feeding inclined plate is positioned above the dust screen;

the closing plate is provided with a second air 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 positioned obliquely below the first air suction port; the first air suction port is communicated with the second air suction port;

the two bevel edge baffles are fixedly connected to the bevel edges of the feeding inclined plate in a one-to-one correspondence manner, the two bevel edge baffles, the feeding disc and the feeding inclined plate form a cavity, and the first air suction port and the second air suction port are air ports of the cavity respectively;

the second air suction cover is fixedly connected to the bottom of the feeding inclined plate and covers the first air suction port;

the air knife bracket is fixedly connected to the rack;

the air knife comprises an air inlet and an air outlet which are communicated with each other; the air knife is fixedly connected to the air knife bracket, and the air outlet faces the sealing plate or the feeding inclined plate;

and the soft curtain is fixedly connected to the air knife bracket and positioned above the feeding plate, and a gap is formed between the soft curtain and the top surface of the feeding plate.

8. A screening machine according to claim 7, wherein: and the feeding inclined plate is also provided with a plurality of second arc-shaped material grooves which are arranged in parallel, and the second arc-shaped material grooves are obliquely arranged downwards.

9. A screening machine according to claim 7, wherein: the dust collection mechanism further includes:

the dust collection barrel is communicated with the first air suction cover and the second air suction cover in an airtight manner;

and the output end of the air suction driving device is communicated with the dust collecting barrel in an air-tight manner and is in communication connection with the control device.

10. A screening machine according to claim 7, wherein: further comprising:

and the pressure regulating valve is connected with the air inlet in an airtight manner and is in communication connection with the control device.

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