CN220425471U - Wheat straw crushing and screening device - Google Patents

Abstract

The utility model belongs to the technical field of straw crushing, and particularly relates to a straw crushing and screening device, which comprises the following components: the crushing and screening device comprises a crushing and screening device body and two crushing rollers, wherein the two crushing rollers are rotationally connected in the crushing and screening device body, and two discharge ports communicated with the outside are formed in the crushing and screening device body; the gear groove is formed in the crushing and screening device body, two gears are rotationally connected in the gear groove, and the two gears are fixedly connected with one ends of the two crushing rollers respectively; the utility model solves the problems that when the crushing and screening device is used, partial straws are often found to be not crushed completely, so that users need to pour the straws which are not crushed completely into the crushing and screening device again for crushing again, the workload of the users can be increased, the use is not facilitated, and the completely crushed straws are prevented from being stuck on a screening net.

Description

Wheat straw crushing and screening device

Technical Field

The utility model belongs to the technical field of straw crushing, and particularly relates to a straw crushing and screening device.

Background

Wheat straw refers to the stem residue of a wheat plant, which is the portion of wheat that remains after harvesting. The wheat straw mainly comprises stems and leaves of wheat plants, is a type of crop straw, plays an important role in agricultural production, can be used as feed, energy sources, materials and the like, can also be used for manufacturing materials such as knitting, paper, fiber boards and the like, and can also play a certain environmental role in agricultural production, for example, can be used as a soil cover to keep soil humidity, reduce water evaporation, soil erosion and the like.

For example, chinese patent with publication number CN208924718U discloses a straw fodder crushing screening device, which comprises a feeding hopper, the lower extreme welding of feeder hopper has broken case, the lower extreme symmetry welding of broken case has a plurality of supporting legs, the lower extreme of feeder hopper is linked together with broken case, the welding of the position that just is located the feeder hopper lower extreme on the inner wall of broken case has crushing cover, the screen plate is installed to the position that is located crushing cover lower extreme on the inner wall of broken case, excitation mechanism is installed to the position that is located the screen plate lower extreme on the inner wall of broken case. According to the utility model, the materials can be intensively crushed through the crushing cover, the crushing effect is improved, the blockage of the materials can be prevented, the driving shaft is driven to rotate through the servo motor, the cam is enabled to rotate, the screen plate can be repeatedly vibrated, the screening efficiency of the materials on the screen plate is higher, the feed processing efficiency is improved, and the processing time is reduced.

The above patent has the following problems:

this patent suffers from several drawbacks in use, such as: when the crushing and screening device is used, part of straws are often found to be not crushed completely, so that a user needs to pour the straws which are not crushed completely into the crushing and screening device again for crushing, and the mode can increase the workload of the user and is unfavorable for use. In view of this, we propose a straw crushing and screening device.

Disclosure of Invention

The utility model aims at solving the technical problems, and provides a wheat straw crushing and screening device, which solves the problems that when the crushing and screening device is used, part of straws are often found to be incompletely crushed, so that a user needs to pour the straws which are not completely crushed into the crushing and screening device again for crushing, the workload of the user can be increased, the use is not facilitated, and the completely crushed wheat straws are prevented from being stuck on a screening net.

In view of the above, the present utility model provides a straw crushing and screening device, comprising:

the crushing and screening device comprises a crushing and screening device body and two crushing rollers, wherein the two crushing rollers are rotationally connected in the crushing and screening device body, and two discharge ports communicated with the outside are formed in the crushing and screening device body;

the gear groove is formed in the crushing and screening device body, two gears are rotationally connected in the gear groove, and the two gears are fixedly connected with one ends of the two crushing rollers respectively;

the first motor is fixedly connected to the crushing and screening device body, and the output end of the first motor penetrates through one side of the crushing and screening device body and extends into the gear groove to be fixed with one gear;

the screening net is rotationally connected in the crushing and screening device body;

the vibration component is positioned in the crushing and screening device body and is used for driving the screening net to vibrate;

the fixed box is fixedly connected to the crushing and screening device body, a collecting tank communicated with the outside is arranged in the fixed box, the collecting tank is communicated with one of the discharge holes of the crushing and screening device body, the bottom surface of the collecting tank is fixedly connected with a ventilation pipe, and one end of the ventilation pipe extends to the outside and is positioned above the crushing and screening device body;

the ventilation box is fixedly connected to the top surface of the crushing and screening device body, one end of the ventilation box is fixedly connected with one end of the ventilation pipe, and the other end of the ventilation box is fixedly connected with an exhaust pipe;

the air blowing component is positioned in the ventilation box and is used for discharging air in the ventilation pipe to the outside;

the air filtering net is fixedly connected to the top surface of the crushing and screening device body and is fixed with the ventilation box.

Based on the above-mentioned structure, through the groove that gathers materials that sets up, can let on the screening net not by the complete crushing wheat straw enter into the inslot that gathers materials through the screening net, collect by the groove that gathers materials, through the subassembly of blowing that sets up, the ventilation box, ventilation pipe and exhaust pipe, let the air in ventilation pipe and the ventilation box be discharged to the external world through the exhaust pipe by the subassembly that blows, make and form negative pressure in ventilation box and the ventilation pipe, let the straw that is not completely crushed in the collection groove receive the effect of negative pressure in ventilation box and the ventilation pipe, be inhaled into ventilation pipe and ventilation box, and discharge into crushing sieving mechanism body's feed inlet through the exhaust pipe in, smash again, through the filter screen that sets up, when the straw that is not completely crushed is discharged to crushing sieving mechanism body's feed inlet in through the exhaust pipe, can be blocked by the filter screen, let the filter screen can rotate in crushing sieving mechanism body, through the first motor and vibration subassembly that sets up can let first motor drive the filter screen vibrate through rotating the subassembly, ensure that the straw that is completely crushed can follow crushing mechanism and shake and fall in crushing device and through the internal to another crushing straw that is glued to the external world on the crushing sieving mechanism body.

Preferably, the vibration assembly includes:

the rotary groove is formed in the crushing and screening device body, a first sprocket is rotationally connected to the rotary groove and fixed on an output shaft of the first motor, a second sprocket is rotationally connected to the rotary groove, one end of the second sprocket penetrates through the rotary groove and extends into the crushing and screening device body, and a chain is meshed on the first sprocket and the second sprocket;

the rotating block is fixedly connected to one end of the gear and positioned below the screening net to be attached to the screening net.

Further, it is ensured that the completely crushed wheat straw does not stick to the screening net.

Preferably, one end of the second sprocket is rotationally connected with the crushing screening device body, the rotating block is rotationally connected with the inner cavity of the crushing screening device body, and the chain is positioned in the rotary groove and is in sliding connection with the rotary groove.

Further, one end of the second chain wheel is guaranteed to normally rotate in the crushing and screening device body, the rotating block is guaranteed to normally rotate in the inner cavity of the crushing and screening device body, and the chain is guaranteed to normally slide in the rotating groove.

Preferably, the blowing assembly includes:

the protection box, protection box fixed connection is at the inner chamber of ventilation box, fixedly connected with second motor in the protection box, and the output shaft of second motor runs through the protection box and extends to in the ventilation box, fixedly connected with flabellum on the output of second motor.

Further, it is ensured that the user does not need to pour the wheat straw which is not completely crushed into the crushing and screening device again for crushing, and the workload of the user is reduced.

Preferably, the output shaft of the second motor is rotationally connected with the protection box, and the fan blade is rotationally connected with the ventilation box.

Further, the output shaft of the second motor can be ensured to normally rotate in the protection box, and the fan blades can be ensured to normally rotate in the ventilation box.

Preferably, the two gears are meshed with each other, an output shaft of the first motor is rotationally connected with the crushing and screening device body, and the bottom surface of the material collecting groove is obliquely arranged.

Further, it is ensured that when one of the gears rotates, the other gear can be driven to rotate, the output shaft of the first motor can normally rotate in the crushing and screening device body, and when the wheat straw which is not completely crushed enters the material collecting groove, the wheat straw can enter the ventilation pipe along the material collecting groove.

Preferably, the collecting tank is communicated with the inner cavity of the ventilation pipe, the ventilation pipe is communicated with the inner cavity of the ventilation box, the ventilation box is communicated with the inner cavity of the exhaust pipe, and the exhaust pipe is obliquely arranged.

Further, it is ensured that the wheat straw which is not fully crushed in the collecting tank can enter the ventilation pipe, and the wheat straw which is not fully crushed in the collecting tank can enter the inner cavity of the ventilation box through the inner cavity of the ventilation pipe, and the wheat straw which is not fully crushed in the ventilation box can be discharged to the feed inlet of the crushing and screening device body through the exhaust pipe.

Preferably, the wind filtering net is in a shape of a loop, the height of the net plate of the wind filtering net is 45-65cm, and the diameter of the net hole of the wind filtering net is 0.1-0.2cm.

Further, when the wheat straw which is not completely crushed is discharged into the feed inlet of the crushing and screening device body through the exhaust pipe, the wheat straw can be blocked by the air filtering net.

The beneficial effects of the utility model are as follows:

1. this screening device is smashed to wheat straw, through the groove that gathers materials that sets up, can let on the screening net not by the complete straw that gathers materials through the screening net enter into the inslot that gathers materials, collect by the groove that gathers materials, through the subassembly of blowing that sets up, the ventilation box, ventilation pipe and exhaust pipe, let the air in ventilation box and the ventilation box be discharged to the external world through the exhaust pipe, form negative pressure in messenger's ventilation box and the ventilation pipe, let the straw that is not completely smashed in the collection groove receive the effect of negative pressure in ventilation box and the ventilation pipe, be inhaled into ventilation pipe and ventilation box, and discharge into the feed inlet of smashing the screening device body through the exhaust pipe, smash once more, through the wind screen that sets up, when the straw that is not completely smashed is discharged into the feed inlet of smashing the screening device body through the exhaust pipe in, can be blocked by the wind screen, when smashing the screening device is used, often, can find that partial straw is not smashed completely, lead to the user need to fall into smashing the straw that is not fully smashed again in smashing the screening device, this kind of mode can increase user's work load, unfavorable for use.

2. This screening device is smashed to wheat stalk, through the screening net that sets up, let the screening net can rotate in smashing the screening device is originally internal, through first motor and the vibrating assembly that sets up, can let first motor drive the screening net through the rotating assembly and vibrate, ensure that the wheat stalk that is smashed completely can shake from the screening net and fall at smashing the screening device originally internally to remove to the external world through smashing this internal another discharge gate of screening device, prevent that the wheat stalk that smashes completely from gluing on the screening net.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view showing an internal structure of a crushing and screening apparatus body according to the present utility model;

FIG. 3 is a schematic view of the internal structure of the gear slot according to the present utility model;

FIG. 4 is a second schematic view of the internal structure of the main body of the crushing and screening device according to the present utility model;

fig. 5 is a schematic view showing the internal structure of the ventilation box in the present utility model.

The label in the figure is:

1. crushing and screening device bodies; 2. a pulverizing roller; 3. a gear groove; 4. a gear; 5. a first motor; 6. screening a net; 7. a fixed box; 8. a material collecting groove; 9. a ventilation box; 10. a ventilation pipe; 11. an exhaust pipe; 12. a rotary groove; 13. a first sprocket; 14. a second sprocket; 15. a chain; 16. a rotating block; 17. a protective case; 18. a second motor; 19. a fan blade; 20. an air filtering net.

Detailed Description

The present application is described in further detail below in conjunction with fig. 1-5.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.

The embodiment of the application discloses screening device is smashed to wheat stalk includes:

the crushing and screening device comprises a crushing and screening device body 1 and two crushing rollers 2, wherein the two crushing rollers 2 are rotationally connected in the crushing and screening device body 1, and two discharge ports communicated with the outside are formed in the crushing and screening device body 1;

the gear groove 3 is formed in the crushing and screening device body 1, two gears 4 are rotationally connected in the gear groove 3, and the two gears 4 are fixedly connected with one ends of the two crushing rollers 2 respectively;

the first motor 5 is fixedly connected to the crushing and screening device body 1, and the output end of the first motor 5 penetrates through one side of the crushing and screening device body 1 and extends into the gear groove 3 to be fixed with one gear 4;

the screening net 6 is rotatably connected in the crushing and screening device body 1;

the vibration component is positioned in the crushing and screening device body 1 and is used for driving the screening net 6 to vibrate;

the fixed box 7 is fixedly connected to the crushing and screening device body 1, a material collecting groove 8 communicated with the outside is formed in the fixed box 7, the material collecting groove 8 is communicated with one of the discharge holes of the crushing and screening device body 1, a ventilation pipe 10 is fixedly connected to the bottom surface of the material collecting groove 8, and one end of the ventilation pipe 10 extends to the outside and is located above the crushing and screening device body 1;

the ventilation box 9, the ventilation box 9 is fixedly connected to the top surface of the crushing and screening device body 1, one end of the ventilation box 9 is fixedly connected with one end of a ventilation pipe 10, and the other end of the ventilation box 9 is fixedly connected with an exhaust pipe 11;

a blowing assembly located in the ventilation box 9 and for discharging wind in the ventilation pipe 10 to the outside;

the air filter net 20, the air filter net 20 fixed connection is at the top surface of smashing screening device body 1 and fixed with ventilation box 9.

In one embodiment, a vibration assembly includes:

a rotary groove 12, the rotary groove 12 is arranged in the crushing and screening device body 1, a first sprocket 13 is rotationally connected with the rotary groove 12, the first sprocket 13 is fixed on the output shaft of the first motor 5, a second sprocket 14 is rotationally connected with the rotary groove 12, one end of the second sprocket 14 penetrates through the rotary groove 12 and extends into the crushing and screening device body 1, and a chain 15 is meshed on the first sprocket 13 and the second sprocket 14;

the rotating block 16, the rotating block 16 is fixedly connected to one end of the gear 4 and is positioned below the screening net 6 to be attached to the screening net 6.

Specifically, when using, the user starts first motor 5, let the output shaft of first motor 5 drive one of them gear 4 rotate in gear groove 3, when one of them gear 4 rotates, one of them gear 4 can drive one of them crushing roller 2 and rotate, simultaneously one of them gear 4 can drive another crushing roller 2 through another gear 4 and carry out reverse rotation, wherein when the output shaft of first motor 5 rotates, the output shaft of first motor 5 still can drive first sprocket 13 and rotate in the rotary groove 12, when first sprocket 13 rotates, first sprocket 13 can drive second sprocket 14 through chain 15 and rotate in the rotary groove 12, when second sprocket 14 rotates, second sprocket 14 can drive rotary block 16 and rotate in screening net 6's below, make screening net 6 produce the vibration, then the user falls crushing screening device body 1 with the wheat straw, let two crushing rollers 2 smash the processing with the wheat straw, the wheat straw after smashing can drop on screening net 6 this moment, the wheat straw that is smashed can receive screening net 6 vibration influence, let not by complete crushing straw through screening net 6 and entering into one of them through the mouth that the screening net 6 is smashed in the mouth and the device that the screening net 1 is smashed through the mouth that the mouth is got into completely through the screening device 1 completely.

In this embodiment, it is ensured that the completely crushed straw does not stick to the screening wire 6.

In one embodiment, one end of the second sprocket 14 is rotatably connected to the crushing and screening device body 1, the rotating block 16 is rotatably connected to the inner cavity of the crushing and screening device body 1, and the chain 15 is located in the rotary groove 12 and slidably connected to the rotary groove 12.

In this embodiment, it is ensured that one end of the second sprocket 14 can normally rotate in the crushing and screening device body 1, that the rotating block 16 can normally rotate in the inner cavity of the crushing and screening device body 1, and that the chain 15 can normally slide in the rotating groove 12.

In one embodiment, the blower assembly includes:

the protection box 17, protection box 17 fixed connection is at the inner chamber of ventilation box 9, and the second motor 18 of fixed connection in the protection box 17, and the output shaft of second motor 18 runs through protection box 17 and extends to in the ventilation box 9, is connected with flabellum 19 on the output of second motor 18.

Specifically, when the wheat straw which is not completely crushed enters the material collecting tank 8, the user starts the second motor 18, so that the second motor 18 drives the fan blade 19 to rotate in the ventilation box 9, when the fan blade 19 rotates, the fan blade 19 can discharge air in the ventilation box 9 and the ventilation pipe 10 to the outside through the exhaust pipe 11, negative pressure is formed in the ventilation box 9 and the ventilation pipe 10, the wheat straw which is completely crushed in the material collecting tank 8 is subjected to the action of the negative pressure in the ventilation pipe 10, is sucked into the ventilation pipe 10 from the material collecting tank 8, enters the ventilation box 9 through the ventilation pipe 10, is blown into the exhaust pipe 11 from the ventilation box 9 by the fan blade 19, and reenters between the two crushing rollers 2 through the exhaust pipe 11, so that the wheat straw which is not completely crushed is crushed again.

In this embodiment, ensure that the user need not pour the wheat straw that does not smash completely into crushing sieving mechanism again in smashing, reduced user's work load.

In one embodiment, the output shaft of the second motor 18 is rotatably connected to the protective box 17, and the fan blades 19 are rotatably connected to the ventilation box 9.

In this embodiment, the output shaft of the second motor 18 is ensured to rotate normally in the protection box 17, and the fan blade 19 is ensured to rotate normally in the ventilation box 9.

In one embodiment, the two gears 4 are meshed with each other, the output shaft of the first motor 5 is rotatably connected with the crushing and screening device body 1, and the bottom surface of the material collecting groove 8 is obliquely arranged.

In this embodiment, it is ensured that when one of the gears 4 rotates, the other gear 4 can be driven to rotate, so that the output shaft of the first motor 5 can normally rotate in the crushing and screening device body 1, and that when the wheat straw which is not completely crushed enters the material collecting tank 8, the wheat straw can enter the ventilation pipe 10 along the material collecting tank 8.

In one embodiment, the collecting tank 8 is communicated with the inner cavity of the ventilation pipe 10, the ventilation pipe 10 is communicated with the inner cavity of the ventilation box 9, the ventilation box 9 is communicated with the inner cavity of the exhaust pipe 11, and the exhaust pipe 11 is obliquely arranged.

In this embodiment, it is ensured that the wheat straw which is not fully crushed in the collecting trough 8 can enter the ventilation pipe 10, that the wheat straw which is not fully crushed in the collecting trough 8 can enter the inner cavity of the ventilation box 9 through the inner cavity of the ventilation pipe 10, and that the wheat straw which is not fully crushed in the ventilation box 9 can be discharged to the feed inlet of the crushing and screening device body 1 through the exhaust pipe 11.

In one embodiment, the air filter net 20 has a shape of a circle, the height of the net plate of the air filter net 20 is 45-65cm, and the diameter of the net hole of the air filter net 20 is 0.1-0.2cm.

In this embodiment, when the straw which is not completely crushed is discharged to the feed inlet of the crushing and screening device body 1 through the exhaust pipe 11, the straw can be blocked by the air filter 20.

When the straw crushing and screening device of the embodiment is used, a user starts the first motor 5, the output shaft of the first motor 5 drives one of the gears 4 to rotate in the gear groove 3, when one of the gears 4 rotates, one of the gears 4 drives one of the crushing rollers 2 to rotate, and simultaneously one of the gears 4 drives the other crushing roller 2 to reversely rotate through the other gear 4, wherein when the output shaft of the first motor 5 rotates, the output shaft of the first motor 5 also drives the first sprocket 13 to rotate in the rotating groove 12, when the first sprocket 13 rotates, the first sprocket 13 drives the second sprocket 14 to rotate in the rotating groove 12 through the chain 15, when the second sprocket 14 rotates, the second sprocket 14 drives the rotating block 16 to rotate below the screening net 6, so that the screening net 6 vibrates, and then the user pours straws into the crushing and screening device body 1, the two crushing rollers 2 crush wheat straws, the crushed wheat straws fall onto the screening net 6, at the moment, the crushed wheat straws can be affected by the vibration of the screening net 6, the wheat straws which are not completely crushed enter the collecting tank 8 through the screening net 6 and one of the discharging holes, the wheat straws which are completely crushed fall into the crushing screening device body 1 from the screening net 6, the wheat straws slide to the outside through the other discharging hole on the crushing screening device body 1, when the wheat straws which are not completely crushed enter the collecting tank 8, a user starts the second motor 18, the second motor 18 drives the fan blades 19 to rotate in the ventilating box 9, when the fan blades 19 rotate, the air in the ventilating box 9 and the ventilating pipe 10 is discharged to the outside through the exhaust pipe 11, negative pressure is formed in the ventilating box 9 and the ventilating pipe 10, the wheat straw completely crushed in the material collecting tank 8 is subjected to the action of the negative pressure in the ventilation pipe 10, is sucked into the ventilation pipe 10 from the material collecting tank 8, enters the ventilation box 9 through the ventilation pipe 10, is blown into the exhaust pipe 11 from the ventilation box 9 by the fan blades 19, and reenters between the two crushing rollers 2 through the exhaust pipe 11, so that the wheat straw which is not completely crushed is crushed again, the condition that the wheat straw which is not completely crushed is not required to be poured into the crushing and screening device again for crushing is ensured, and the workload of a user is reduced.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (8)

1. The utility model provides a screening device is smashed to wheat stalk which characterized in that includes:

the crushing and screening device comprises a crushing and screening device body (1) and two crushing rollers (2), wherein the two crushing rollers (2) are rotationally connected in the crushing and screening device body (1), and two discharge holes communicated with the outside are formed in the crushing and screening device body (1);

the gear groove (3), the gear groove (3) is arranged in the crushing and screening device body (1), two gears (4) are connected in a rotating way in the gear groove (3), and the two gears (4) are fixedly connected with one ends of the two crushing rollers (2) respectively;

the first motor (5), the first motor (5) is fixedly connected to the crushing and screening device body (1), and the output end of the first motor (5) penetrates through one side of the crushing and screening device body (1) and extends into the gear groove (3) to be fixed with one gear (4);

the screening net (6) is rotationally connected in the crushing and screening device body (1);

the vibration component is positioned in the crushing and screening device body (1) and is used for driving the screening net (6) to vibrate;

the fixed box (7), fixed box (7) fixed connection is on smashing screening device body (1), set up in fixed box (7) with outside be linked together gather materials groove (8), and gather materials groove (8) are linked together with smashing one of them discharge gate of screening device body (1), gather materials the bottom surface fixedly connected with ventilation pipe (10) in groove (8), and the one end of ventilation pipe (10) extends to the external side and is located smashing screening device body (1);

the ventilation box (9), the ventilation box (9) is fixedly connected to the top surface of the crushing and screening device body (1), one end of the ventilation box (9) is fixedly connected with one end of a ventilation pipe (10), and the other end of the ventilation box (9) is fixedly connected with an exhaust pipe (11);

the air blowing component is positioned in the ventilation box (9) and is used for discharging air in the ventilation pipe (10) to the outside;

the air filtering net (20), the air filtering net (20) is fixedly connected to the top surface of the crushing and screening device body (1) and is fixed with the ventilation box (9).

2. The straw shredding and screening device according to claim 1, wherein the vibration assembly comprises:

the rotary groove (12) is formed in the crushing and screening device body (1), a first sprocket (13) is rotationally connected to the rotary groove (12), the first sprocket (13) is fixed on an output shaft of the first motor (5), a second sprocket (14) is rotationally connected to the rotary groove (12), one end of the second sprocket (14) penetrates through the rotary groove (12) and extends into the crushing and screening device body (1), and a chain (15) is meshed on the first sprocket (13) and the second sprocket (14);

the rotating block (16), the rotating block (16) is fixedly connected to one end of the gear (4) and is positioned below the screening net (6) and is attached to the screening net (6).

3. The straw shredding and screening device according to claim 2, characterized in that: one end of the second chain wheel (14) is rotationally connected with the crushing and screening device body (1), the rotating block (16) is rotationally connected with the inner cavity of the crushing and screening device body (1), and the chain (15) is positioned in the rotary groove (12) and is in sliding connection with the rotary groove (12).

4. The straw shredding and screening device according to claim 1, wherein the air blowing assembly comprises:

the protection box (17), protection box (17) fixed connection is at the inner chamber of ventilation box (9), fixedly connected with second motor (18) in protection box (17), and the output shaft of second motor (18) runs through protection box (17) and extends to in ventilation box (9), fixedly connected with flabellum (19) on the output of second motor (18).

5. The straw shredding and screening device according to claim 4, wherein: the output shaft of the second motor (18) is rotationally connected with the protection box (17), and the fan blades (19) are rotationally connected with the ventilation box (9).

6. The straw shredding and screening device according to claim 1, characterized in that: the two gears (4) are meshed with each other, an output shaft of the first motor (5) is rotationally connected with the crushing and screening device body (1), and the bottom surface of the collecting tank (8) is obliquely arranged.

7. The straw shredding and screening device according to claim 1, characterized in that: the collecting tank (8) is communicated with the inner cavity of the ventilation pipe (10), the ventilation pipe (10) is communicated with the inner cavity of the ventilation box (9), the ventilation box (9) is communicated with the inner cavity of the exhaust pipe (11), and the exhaust pipe (11) is obliquely arranged.

8. The straw shredding and screening device according to claim 1, characterized in that: the wind filtering net (20) is of a return structure, the height of a net plate of the wind filtering net (20) is 45-65cm, and the diameter of a net hole of the wind filtering net (20) is 0.1-0.2cm.