CN112517392A

CN112517392A - Wheat edulcoration sieving mechanism is used in mechanical type agricultural processing

Info

Publication number: CN112517392A
Application number: CN202011514692.3A
Authority: CN
Inventors: 胡英会; 张妙霞; 王飞; 张世兰; 乔礼; 王磊
Original assignee: Anhui Yunfei Fangzhi Biotechnology Co ltd
Current assignee: Anhui Yunfei Fangzhi Biotechnology Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-03-19

Abstract

The invention relates to the technical field of agricultural machinery, and discloses a wheat impurity removal screening device for mechanical agricultural processing, which comprises a shell, wherein an impurity removal box is connected inside the shell in a sliding manner, a spring I is arranged between the bottom of the impurity removal box and the lower side wall of an inner cavity of the shell, a control valve is arranged at the top of the impurity removal box, a hopper is arranged at the top of the control valve, and a screening plate II is movably connected to the lower position of the inner wall of the impurity removal box relative to the control valve. This wheat edulcoration sieving mechanism for mechanical type agricultural processing drives speed change gear through edulcoration case downstream and changes vibrator frequency of vibration, improves screening edulcoration speed, and according to the change of speed change gear atress, the feeding is closed to the automatically regulated control valve, prevents to aggravate the jam, and when the control valve was closed, drive socket start-up heating silk screen, wheat stoving with higher speed prevents to block up the sieve mesh because of the humidity to improve screening edulcoration efficiency.

Description

Wheat edulcoration sieving mechanism is used in mechanical type agricultural processing

Technical Field

The invention relates to the technical field of agricultural machinery, in particular to a wheat impurity removal and screening device for mechanical agricultural processing.

Background

Wheat is a general term of wheat plants, is a monocotyledon, is a gramineous plant widely planted in all over the world, has caryopsis as one staple food of human beings, can be used for making bread, steamed bread, biscuits, noodles and other foods after being ground into flour, can be used for making beer, alcohol, white spirit (such as vodka) or biomass fuel after being fermented, is one of the most common crops in life, needs to be stored after being harvested, and needs to be subjected to impurity removal before being stored, namely, the impurities such as wheat awn and the like in the wheat are removed.

At present, utilize the sieving mechanism to sieve the edulcoration to wheat in the market mostly, but current sieving mechanism screening efficiency is low, the impurity that the wheat after the screening contains is still very much, and be difficult for clearing up the impurity after the separation, lead to impurity to block up the screening board easily, when the inside wheat of sieving mechanism is too much, a lot of wheat is because of piling up its inside humidity easily, block up the sieve mesh easily, cause the screening insufficient, and moist wheat is moldy easily, and then influence the storage of other wheat, give people and bring the loss, and can not improve screening speed according to the gravity change automation of screening wheat, when taking place to block up, if continue the feeding, can cause the jam to aggravate, influence screening efficiency.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a wheat impurity removal screening device for mechanical agricultural processing, which has the advantages of sufficient impurity removal, high screening efficiency, automatic cleaning of separated impurities, automatic improvement of screening speed according to the gravity change of screened wheat, automatic closing of feeding when blockage occurs, automatic control of heating and dehumidification of wheat and high automation degree, and solves the problems that the conventional device is insufficient in impurity removal, low in screening efficiency, difficult to clean separated impurities, incapable of automatically improving screening speed according to the gravity change of screened wheat, and low in automation degree due to the fact that blockage is aggravated if feeding is continued when blockage occurs, screening efficiency is affected, heating and dehumidification of wheat cannot be automatically controlled.

(II) technical scheme

In order to realize the purposes that the wheat impurity removal screening device has sufficient impurity removal and high screening efficiency, automatically cleans impurities after separation, automatically improves screening speed according to the gravity change of screened wheat, automatically closes feeding when blockage occurs, automatically controls heating and dehumidification of the wheat, and has high automation degree, the invention provides the following technical scheme: a wheat impurity removing and screening device for mechanical agricultural processing comprises a shell, wherein an impurity removing box is connected to the interior of the shell in a sliding mode, a first spring is arranged between the bottom of the impurity removing box and the lower side wall of an inner cavity of the shell, a control valve is arranged at the top of the impurity removing box, a hopper is arranged at the top of the control valve, a second screening plate is movably connected to the lower position of the inner wall of the impurity removing box relative to the control valve, a first screening plate is movably connected to the lower position of the inner wall of the impurity removing box relative to the second screening plate, a vibration device is arranged between the bottom of the impurity removing box and the top of the first screening plate, a speed changing device is arranged on the front side of the vibration device, a speed adjusting device is arranged above the speed changing device, a motor is arranged at the position of the inner wall of the shell relative to the speed adjusting device, a direction adjusting rod is arranged at the, the lower position swing joint of the relative screening board of inner wall of edulcoration case is with dust collection box, the right side wall of edulcoration case has seted up discharge gate one relative screening board position, the left side wall of edulcoration case has seted up discharge gate three relative screening board position, all be provided with the buffer seat between bottom and the discharge gate one of screening board one and between bottom and the discharge gate three of screening board two, discharge gate two has been seted up to the right side wall of shell relative discharge gate one position, the right side wall of shell has seted up the pull mouth relative dust collection box position, the left side wall of shell has seted up discharge gate four relative discharge gate three positions.

Preferably, the left side inner wall swing joint of control valve has the cardboard, the left side wall and the push rod swing joint of cardboard, the upper surface right-hand member position of cardboard is provided with the contact, the right side inner wall of control valve be provided with the socket of contact looks adaptation, along with the push rod moves gradually backward, and then drives the cardboard and uses the left end to carry out anticlockwise deflection as the center, and the hopper is closed gradually to the cardboard this moment, prevents to continue the feeding, aggravates the jam, when the cardboard closes completely, contact and socket joint this moment.

Preferably, the upper surfaces of the second screening plate and the first screening plate are both provided with heating silk screens, the mesh aperture of the heating silk screens on the surfaces of the second screening plate is larger than the diameter of wheat, the mesh aperture of the heating silk screens on the surfaces of the first screening plate is smaller than the diameter of wheat, the two groups of heating silk screens are electrically connected with the socket, impurities such as large-particle impurities and stems and leaves in the wheat are intercepted through the heating silk screens on the surfaces of the second screening plate, the wheat falls into the upper surface of the first screening plate through the second screening plate, the impurities with smaller particles in the wheat are dropped through the heating silk screens on the surfaces of the first screening plate, the impurity removal effect can be improved, when the wheat in the impurity removal box is less, the heating silk screens are not electrified, the screening and impurity removal functions are completed by means of matching the second screening plate and the first screening plate, when the wheat in the impurity removal box is gradually increased, and then influence screening edulcoration, receive socket control when heating the silk screen this moment. Electrifying, accelerating the drying of the wheat, and preventing the sieve pores from being blocked due to moisture, thereby improving the screening and impurity removing efficiency.

Preferably, the vibration device comprises a reversing groove, a cam is movably connected inside the reversing groove, a first connecting rod is arranged between the top of the reversing groove and the bottom of the second screening plate, and a second connecting rod is arranged between the bottom of the reversing groove and the first screening plate.

Preferably, the speed changing device comprises a first rotating shaft, one end of the first rotating shaft is rotatably connected with the cam, a hemispherical surface is arranged at one end of the first rotating shaft, which is far away from the vibrating device, two groups of hemispherical surfaces are arranged, and the two groups of hemispherical surfaces are arranged oppositely.

Preferably, the speed adjusting device comprises a second rotating shaft, the outer wall of the second rotating shaft is provided with two friction surfaces matched with the two groups of hemispherical surfaces, the two friction surfaces are movably connected with the second rotating shaft, a second spring is arranged between the two friction surfaces, a limiting groove is formed in the position, opposite to the right side of the friction surfaces, of the outer wall of the second rotating shaft, the speed changing device can be driven to synchronously move downwards when the impurity removing box moves downwards, the linear velocity of the edge of each friction surface is larger than the inner diameter, when the hemispherical surfaces gradually move downwards, the two friction surfaces synchronously move towards the two sides of the second rotating shaft under the action of elastic potential energy of the second spring, so that the friction surfaces are always attached to the hemispherical surfaces, the rotating speed of the speed adjusting device is gradually increased along with the gradual movement of the hemispherical surfaces.

Preferably, the one end that the accent is close to speed adjusting device to the pole is provided with the cardboard, cardboard and spacing inslot wall swing joint, when two both sides of two sets of friction surface pivots were removed, can promote the spacing groove and remove to edulcoration case direction, and then promote the cardboard and remove backward, and then promote to transfer to the pole and remove backward to drive the push rod and remove gradually backward, and then drive the cardboard and use the left end to carry out anticlockwise deflection as the center, the hopper is closed gradually to the cardboard this moment, prevents to continue the feeding, aggravates the jam.

Preferably, the buffer seat is including buffering the casing, the inner wall sliding connection of buffering the casing has the slider, be provided with spring three between the bottom of slider and the buffering casing, the top of slider is provided with the spliced pole, when vibrations about sieve plate one and sieve plate two, moves down through the extrusion spliced pole, and then presses the slider and slide in the buffering casing, and then compression spring three to the vibrations to sieve plate one and sieve plate two productions are cushioned, prevent that the amplitude is too big, cause equipment damage.

(III) advantageous effects

Compared with the prior art, the invention provides a wheat impurity removal screening device for mechanical agricultural processing, which has the following beneficial effects:

1. this wheat edulcoration sieving mechanism for mechanical type agricultural processing, through changing according to letting in the inside wheat gravity of edulcoration incasement portion, drive edulcoration case inside lapse in the shell, discharge gate one at this moment moves down to discharge gate two positions gradually, discharge gate three moves down to discharge gate four positions gradually simultaneously, the dust collection box moves down to the pull mouth position gradually, make large granule impurity automatically discharge from discharge gate four, wheat after the screening is discharged from discharge gate two positions, take out the dust collection box from the pull mouth simultaneously, realize automatic row's sediment function, prevent to block up.

2. This wheat edulcoration sieving mechanism for mechanical type agricultural processing drives speed change gear through edulcoration case downstream and changes vibrator vibration frequency, improves screening edulcoration speed.

3. This wheat edulcoration sieving mechanism for mechanical type agricultural processing, according to the change of speed change gear atress, the feeding is closed to the automatically regulated control valve, prevents to aggravate the jam.

4. This wheat edulcoration sieving mechanism for mechanical type agricultural processing when the control valve is closed, drives the socket and starts the heating wire net, and wheat is dried with higher speed, prevents to block up the sieve mesh because of the humidity to improve screening edulcoration efficiency.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the housing structure of the present invention;

FIG. 3 is a schematic view of the internal structure of the trash box of the present invention;

FIG. 4 is a schematic structural view of a transmission and a vibration device according to the present invention;

FIG. 5 is a schematic view of a structure of a clamping plate according to the present invention;

FIG. 6 is a schematic view of the control valve of the present invention;

FIG. 7 is a schematic view of a buffer seat according to the present invention;

fig. 8 is a schematic structural view of the discharge port 4 of the present invention.

In the figure: 1. a housing; 2. an impurity removal box; 3. a first spring; 4. a control valve; 5. a hopper; 6. a motor; 7. a speed regulating device; 8. a direction adjusting rod; 9. a push rod; 10. a first discharge hole; 11. a buffer seat; 12. a dust collecting box; 13. a discharge hole II; 14. drawing the opening; 15. a speed change device; 16. a vibration device; 17. screening a plate I; 18. a second screening plate; 19. a discharge hole III; 20. a hemispherical surface; 21. a first rotating shaft; 22. a friction surface; 23. a limiting groove; 24. a second spring; 25. a second rotating shaft; 26. a cam; 27. a reversing slot; 28. a first connecting rod; 29. a second connecting rod; 30. clamping a plate; 31. a contact; 32. a socket; 33. a buffer housing; 34. a slider; 35. a third spring; 36. connecting columns; 37. and a discharge port IV.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, a wheat impurity removing and screening device for mechanical agricultural processing comprises a housing 1, an impurity removing box 2 is slidably connected inside the housing 1, a spring 3 is arranged between the bottom of the impurity removing box 2 and the lower side wall of the inner cavity of the housing 1, a control valve 4 is arranged at the top of the impurity removing box 2, a hopper 5 is arranged at the top of the control valve 4, a screening plate 18 is movably connected to the lower position of the inner wall of the impurity removing box 2 relative to the control valve 4, a screening plate 17 is movably connected to the lower position of the inner wall of the impurity removing box 2 relative to the screening plate 18, a vibration device 16 is arranged between the bottom of the inner wall of the impurity removing box and the top of the screening plate 17, a speed changing device 15 is arranged on the front side of the vibration device 16, a speed regulating device 7 is arranged above the speed changing device 15, a motor 6 is arranged at the position of the inner wall of the, a push rod 9 is arranged between the front face of the control valve 4 and the back face of the direction adjusting rod 8, a dust collecting box 12 is movably connected to the lower position of the inner wall of the impurity removing box 2 relative to the first screening plate 17, a first discharge outlet 10 is arranged at the position of the right side wall of the impurity removing box 2 relative to the first screening plate 17, a third discharge outlet 19 is arranged at the position of the left side wall of the impurity removing box 2 relative to the second screening plate 18, a buffer seat 11 is arranged between the bottom of the first screening plate 17 and the first discharge outlet 10 and between the bottom of the second screening plate 18 and the third discharge outlet 19, a second discharge outlet 13 is arranged at the position of the right side wall of the shell 1 relative to the first discharge outlet 10, a drawing port 14 is arranged at the position of the right side wall of the shell 1.

The left side inner wall swing joint of control valve 4 has cardboard 30, the left side wall and the push rod 9 swing joint of cardboard 30, the upper surface right-hand member position of cardboard 30 is provided with contact 31, the right side inner wall of control valve 4 is provided with the socket 32 with contact 31 looks adaptation, move gradually backward along with push rod 9, and then drive cardboard 30 and use the left end to carry out anticlockwise deflection as the center, hopper 5 is closed gradually to cardboard 30 this moment, prevent to continue the feeding, aggravate the jam, when cardboard 30 closes completely, contact 31 and socket 32 joint this moment.

Heating wire nets are arranged on the upper surfaces of the second screening plate 18 and the first screening plate 17, the mesh diameter of the heating wire nets on the surface of the second screening plate 18 is larger than the diameter of wheat, the mesh diameter of the heating wire nets on the surface of the first screening plate 17 is smaller than the diameter of wheat, two groups of heating wire nets are electrically connected with the socket 32, impurities such as large-particle impurities and stems and leaves in the wheat are intercepted through the heating wire nets on the surface of the second screening plate 18, the wheat falls into the upper surface of the first screening plate 17 through the second screening plate 18, impurities with smaller particles in the wheat are dropped through the heating wire nets on the surface of the first screening plate 17, the impurity removal effect can be improved, when the wheat in the impurity removal box 2 is less, the heating wire nets are not electrified, the screening impurity removal function is completed by matching the second screening plate 18 with the first screening plate 17, when the wheat in the impurity removal box 2 is gradually increased, thereby affecting the screening and impurity removal, and the heating of the silk screen is controlled by the socket 32. Electrifying, accelerating the drying of the wheat, and preventing the sieve pores from being blocked due to moisture, thereby improving the screening and impurity removing efficiency.

The vibrating device 16 comprises a reversing groove 27, a cam 26 is movably connected inside the reversing groove 27, a first connecting rod 28 is arranged between the top of the reversing groove 27 and the bottom of the second screening plate 18, and a second connecting rod 29 is arranged between the bottom of the reversing groove 27 and the first screening plate 17.

The speed changing device 15 comprises a first rotating shaft 21, one end of the first rotating shaft 21 is rotatably connected with the cam 26, one end of the first rotating shaft 21, which is far away from the vibrating device 16, is provided with two groups of hemispheres 20, and the two groups of hemispheres 20 are arranged oppositely.

The speed regulating device 7 comprises a second rotating shaft 25, the outer wall of the second rotating shaft 25 is provided with friction surfaces 22 matched with the two groups of hemispherical surfaces 20, the two groups of friction surfaces 22 are movably connected with the second rotating shaft 25, a second spring 24 is arranged between the two groups of friction surfaces 22, and a limiting groove 23 is arranged at the right side position of the outer wall of the second rotating shaft 25 relative to the friction surfaces 22, so that the speed changing device 15 is driven to synchronously move downwards when the impurity removing box 2 moves downwards, the linear velocity of the edge of the friction surface 22 is larger than the inner diameter, and when the hemispherical surfaces 20 gradually move downwards, the two groups of friction surfaces 22 synchronously move towards the two sides of the second rotating shaft 25 under the action of elastic potential energy of the second spring 24, so that the friction surfaces 22 are always attached to the surfaces of the hemispherical surfaces 20, the rotating speed of the hemispherical surfaces 20 gradually increases along with.

Transfer to one end that pole 8 is close to speed adjusting device 7 and be provided with cardboard 30, cardboard 30 and spacing groove 23 inner wall swing joint, when two sets of friction surfaces 22 pivot two 25 both sides remove, can promote spacing groove 23 and remove to edulcoration case 2 directions, and then promote cardboard 30 backward movement, and then promote to transfer to pole 8 backward movement, thereby drive push rod 9 backward gradually moving, and then drive cardboard 30 and use the left end to carry out anticlockwise deflection as the center, cardboard 30 closes hopper 5 gradually this moment, prevent to continue the feeding, aggravate the jam.

Buffer seat 11 is including buffering casing 33, the inner wall sliding connection of buffering casing 33 has slider 34, be provided with three 35 of spring between the bottom of slider 34 and the buffering casing 33, slider 34's top is provided with spliced pole 36, when vibrations about sieve board 17 and sieve board two 18, through extrusion spliced pole 36 downstream, and then press slider 34 to slide in buffering casing 33, and then three 35 of compression spring, thereby cushion the vibrations that sieve board 17 and sieve board two 18 produced, prevent that the amplitude is too big, cause the equipment to damage.

The working principle is as follows: when the wheat screening and impurity removing device is used, wheat with impurities is poured into the hopper 5, the wheat falls into the impurity removing box 2 through the control valve 4 and enters the upper surface of the second screening plate 18, the motor 6 is started, the speed regulating device 7 is driven to rotate through rotation of the motor 6, the surface of the hemispherical surface 20 is in surface contact with the speed regulating device 7, the hemispherical surface 20 is driven to rotate due to friction, the first rotating shaft 21 is driven to rotate, the cam 26 is driven to rotate periodically inside the reversing groove 27, the reversing groove 27 is driven by the thrust of the cam 26 to vibrate up and down periodically, the first connecting rod 28 drives the second screening plate 18 to vibrate up and down, the first connecting rod 29 drives the first screening plate 17 to vibrate up and down, and the efficiency of screening and impurity removing of the wheat is improved.

When the first screening plate 17 and the second screening plate 18 vibrate up and down, the connecting column 36 is extruded to move downwards, the sliding block 34 is pressed to slide in the buffering shell 33, and then the third spring 35 is compressed, so that the vibration generated by the first screening plate 17 and the second screening plate 18 is buffered, the vibration amplitude is prevented from being too large, and the equipment is prevented from being damaged.

Debris such as large granule impurity and stem leaf in with the wheat through the heating wire net on two 18 surfaces of screening board are held back, the wheat falls into screening board 17 upper surface through two 18 screening boards, make the less impurity of granule drop in the wheat through the heating wire net on screening board 17 surface, further carry out the edulcoration, can improve the effect of edulcoration, when the inside wheat of edulcoration case 2 is less, the heating wire net is not circular telegram this moment, rely on two 18 and the cooperation of screening board to use, accomplish screening edulcoration function.

When the wheat in the impurity removing box 2 is gradually increased, the gravity of the impurity removing box 2 is larger than the elastic potential energy of a spring, the impurity removing box 2 slides downwards in the shell 1, the first discharge port 10 gradually moves downwards to the second discharge port 13, the third discharge port 19 gradually moves downwards to the fourth discharge port 37, the dust collecting box 12 gradually moves downwards to the drawing port 14, large-particle impurities are automatically discharged from the fourth discharge port 37, the screened wheat is discharged from the second discharge port 13, the dust collecting box 12 is taken out from the drawing port 14, the automatic slag discharging function is realized, and blockage is prevented.

Meanwhile, when the impurity removing box 2 moves downwards, the speed change device 15 is driven to synchronously move downwards, because the linear velocity of the edge of the friction surface 22 is larger than the inner diameter, when the hemispherical surface 20 gradually moves downwards, two groups of friction surfaces 22 synchronously move towards two sides of the rotating shaft two 25 under the action of elastic potential energy of the spring two 24, so that the friction surfaces 22 are always attached to the surface of the hemispherical surface 20, the rotating speed of the hemispherical surface 20 is gradually increased along with the gradual downward movement of the hemispherical surface 20, the rotating speed of the rotating shaft one 21 is increased, the amplitude acceleration of the vibration device 16 is influenced, the screening impurity removing efficiency is.

Simultaneously, when two sets of friction surfaces 22 pivot two 25 both sides removed, can promote spacing groove 23 and remove to trash box 2 direction, and then promote cardboard 30 rearward movement, and then promote to transfer to pole 8 rearward movement to drive push rod 9 and remove backward gradually, and then drive cardboard 30 and use the left end to carry out anticlockwise deflection as the center, cardboard 30 closes hopper 5 gradually this moment, prevents to continue the feeding, aggravates the jam.

When cardboard 30 closed completely, contact 31 and socket 32 joint this moment pile up and cause its inside humidity in order to prevent that wheat from blockking up when blockking up, and then influence the screening edulcoration, receive socket 32 control during the heating wire net this moment, energize, wheat stoving with higher speed prevents to block up the sieve mesh because of the humidity, thereby improves screening edulcoration efficiency.

To sum up, the wheat impurity removing and screening device for mechanical agricultural processing drives the impurity removing box 2 to slide downwards in the shell 1 according to the gravity change of wheat introduced into the impurity removing box 2, at the moment, the first discharge port 10 gradually moves downwards to the second discharge port 13, the third discharge port 19 gradually moves downwards to the fourth discharge port 37, the dust collecting box 12 gradually moves downwards to the drawing port 14, so that large-particle impurities are automatically discharged from the fourth discharge port 37, screened wheat is discharged from the second discharge port 13, the dust collecting box 12 is taken out from the drawing port 14, the automatic slag discharging function is realized, the blockage is prevented, the speed change device 15 is driven to change the vibration frequency of the vibration device 16, the screening and impurity removing speed is improved, meanwhile, the feeding is automatically adjusted by adjusting the control valve 4 according to the stress change of the speed change device 15, the aggravating blockage is prevented, when the control valve 4 is closed, the socket 32 is driven to start, the drying of wheat is accelerated, prevents to block up the sieve mesh because of the humidity to improve screening edulcoration efficiency.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a mechanical type is wheat edulcoration sieving mechanism for agricultural processing, includes shell (1), its characterized in that: the inner part of the shell (1) is connected with an impurity removing box (2) in a sliding manner, a first spring (3) is arranged between the bottom of the impurity removing box (2) and the lower side wall of the inner cavity of the shell (1), a control valve (4) is arranged at the top of the impurity removing box (2), a hopper (5) is arranged at the top of the control valve (4), a second screening plate (18) is movably connected to the lower position of the inner wall of the impurity removing box (2) relative to the control valve (4), a first screening plate (17) is movably connected to the lower position of the inner wall of the impurity removing box (2) relative to the second screening plate (18), a vibration device (16) is arranged between the bottom and the top of the first screening plate (17), a speed change device (15) is arranged on the front side of the vibration device (16), a speed regulation device (7) is arranged above the speed change device (15), and a motor (6) is arranged on the inner wall of, a direction adjusting rod (8) is arranged at the upper side position of the outer wall of the speed adjusting device (7), a push rod (9) is arranged between the front surface of the control valve (4) and the back surface of the direction adjusting rod (8), a dust collecting box (12) is movably connected to the lower position of the inner wall of the impurity removing box (2) relative to the first screening plate (17), a first discharge outlet (10) is arranged at the position of the right side wall of the impurity removing box (2) relative to the first screening plate (17), a third discharge outlet (19) is arranged at the position of the left side wall of the impurity removing box (2) relative to the second screening plate (18), buffer seats (11) are arranged between the bottom of the first screening plate (17) and the first discharge outlet (10) and between the bottom of the second screening plate (18) and the third discharge outlet (19), a second discharge outlet (13) is arranged at the position of the right side wall of the shell (1) relative to the first discharge outlet (10), a drawing port (14) is, and a discharge port IV (37) is formed in the left side wall of the shell (1) and corresponds to the discharge port III (19).

2. The wheat impurity removing and screening device for mechanical agricultural processing according to claim (1), which is characterized in that: the left side inner wall swing joint of control valve (4) has cardboard (30), the left side wall and push rod (9) swing joint of cardboard (30), the upper surface right end position of cardboard (30) is provided with contact (31), the right side inner wall of control valve (4) is provided with socket (32) with contact (31) looks adaptation.

3. The wheat impurity removing and screening device for mechanical agricultural processing according to claim 1 or 2, wherein: the upper surface of screening board two (18) and screening board (17) all is provided with the heating wire net, screening board two (18) surface heating wire net aperture is greater than the wheat diameter, screening board (17) surface heating wire net aperture is less than the wheat diameter, and is two sets of heating wire net all with socket (32) electric connection.

4. The wheat impurity removing and screening device for mechanical agricultural processing according to claim 1, which is characterized in that: the vibrating device (16) comprises a reversing groove (27), a cam (26) is movably connected inside the reversing groove (27), a first connecting rod (28) is arranged between the top of the reversing groove (27) and the bottom of the second screening plate (18), and a second connecting rod (29) is arranged between the bottom of the reversing groove (27) and the first screening plate (17).

5. The wheat impurity removing and screening device for mechanical agricultural processing according to claim 1 or 4, wherein: the speed changing device (15) comprises a first rotating shaft (21), one end of the first rotating shaft (21) is rotatably connected with the cam (26), a hemispherical surface (20) is arranged at one end, away from the vibrating device (16), of the first rotating shaft (21), two groups of hemispherical surfaces (20) are arranged, and the two groups of hemispherical surfaces (20) are arranged oppositely.

6. The wheat impurity removing and screening device for mechanical agricultural processing according to claim 1, which is characterized in that: the speed regulating device (7) comprises a second rotating shaft (25), the outer wall of the second rotating shaft (25) is provided with two friction surfaces (22) matched with the two groups of hemispherical surfaces (20), the two friction surfaces (22) are movably connected with the second rotating shaft (25), a second spring (24) is arranged between the two friction surfaces (22), and the outer wall of the second rotating shaft (25) is provided with a second spring (23) relative to the right side position of the friction surfaces (22).

7. The wheat impurity removing and screening device for mechanical agricultural processing according to claim 1 or 5, wherein: one end of the direction adjusting rod (8) close to the speed adjusting device (7) is provided with a clamping plate (30), and the clamping plate (30) is movably connected with the inner wall of the limiting groove (23).

8. The wheat impurity removing and screening device for mechanical agricultural processing according to claim 1, which is characterized in that: buffer seat (11) are including buffering casing (33), the inner wall sliding connection of buffering casing (33) has slider (34), be provided with spring three (35) between the bottom of slider (34) and buffering casing (33), the top of slider (34) is provided with spliced pole (36).