CN114130653B

CN114130653B - Coarse cereal screening, stone removing and cleaning machine

Info

Publication number: CN114130653B
Application number: CN202111451635.XA
Authority: CN
Inventors: 郁志华
Original assignee: Dongtai Xinfuda Machinery Co ltd
Current assignee: Dongtai Xinfuda Machinery Co ltd
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2022-11-08
Anticipated expiration: 2041-12-01
Also published as: CN114130653A

Abstract

The invention relates to the technical field of coarse cereal screening equipment and discloses a coarse cereal screening and stone removing cleaning machine which comprises a base, wherein a composite screening box is arranged at the top of one side of the base, a first screening plate and a second screening plate are sleeved on the inner side of the top and the inner side of the bottom of the composite screening box, and reciprocating power mechanisms are arranged at the bottom of the second screening plate and the bottom of the first screening plate. The composite screening box, the first screening plate, the second screening plate, the first material conveying pipe fitting, the pneumatic aggregate part and the two sets of reciprocating power mechanisms are matched and assembled to form the composite multifunctional screening mechanism, and in the subsequent use process, large-sized stone sundries can be screened primarily, small coarse cereal particles and small stone sundries can be screened secondarily, coarse cereal particles full of conveyed particles and the stone sundries with the same size contained in the coarse cereal particles can be conveyed automatically, the use range is expanded fully, and long-distance transfer time among multiple devices is not required to be transmitted.

Description

Coarse cereal screening, stone removing and cleaning machine

Technical Field

The invention relates to the technical field of coarse cereal screening equipment, in particular to a coarse cereal screening, stone removing and cleaning machine.

Background

Minor cereals generally refer to grain and bean crops other than five crops of rice, wheat, corn, soybean and potato. Mainly comprises the following steps: sorghum, millet, buckwheat, oat, barley, broom corn millet, broomcorn, coix seed, grain amaranth, kidney bean, mung bean, small bean, broad bean, pea, cowpea, lentil, black bean and the like, and is characterized by short growth period, small planting area, special planting area, low yield and generally rich nutrient components.

At present, in the production and processing process of coarse cereals, a screening and stone-removing cleaning machine is one of indispensable devices, most screening and stone-removing cleaning machines adopt winnowing screening operation, the principle that coarse cereal grains and stone impurities with the same size are different in weight and the landing points are separated under the same level of wind power is mainly utilized, the processing efficiency is high, and the screening and stone-removing cleaning machines are welcomed by users.

Disclosure of Invention

The invention provides a coarse cereal screening, stone removing and cleaning machine, which solves the problems in the background technology.

The invention provides the following technical scheme: the utility model provides a stone descaling machine is removed in coarse cereals screening, includes the base, the top of base one side is provided with the compound screening case, and the inboard of compound screening roof portion and the inboard of bottom have cup jointed first screening plate and second screening plate, the bottom of second screening plate and the bottom of first screening plate all are provided with reciprocal power unit, one side and the bottom at compound screening roof portion are connected with first defeated material pipe fitting respectively and are provided with the defeated material pipe fitting of second, one side fixedly connected with T type support of the defeated material pipe fitting of second, and one side and the bottom at T type support top are connected with compound box of selection by winnowing and fixed connection respectively at the top surface at base middle part, the inboard of compound bottom half of selection by winnowing has cup jointed the blast part, the compound box of selection by winnowing has cup jointed material part respectively the bottom and has installed the blast part, pneumatic part is installed to the opposite side at compound screening roof portion.

Carefully, the inside of compound screening case is including the screening box, and the bottom of screening box is the toper structure, the inner wall joint at screening box top has first adjustable fender, install through the screw between the inboard at first adjustable fender and screening box top.

The choice, the inside of first screening plate is including first screening frame board, and first screening frame board joint is in the inboard at screening box top, the inboard fixed cup joint of first screening frame board has first filter screen, the first T type pole of top surface fixedly connected with of first screening frame board both sides, first location overlap strip has been cup jointed in the inboard activity at first T type pole top, the fixed cup joint of first location overlap strip is in the inside of screening box, install a compression spring between the bottom surface of first location overlap strip and the top surface of first screening frame board.

The choice, the inside of second screening plate is including the second screening frame board, and the second screening frame board joint is in the inboard of screening bottom half, the inboard of second screening frame board is fixed to be cup jointed the second filter screen, the top surface fixedly connected with second T type pole of second screening frame board both sides, the inboard activity at second T type pole top has been cup jointed second location noose, the fixed inside of cup jointing at the screening box of second location noose, install second compression spring between the bottom surface of second location noose and the top surface of second screening frame board, the mesh number of second filter screen is greater than the mesh number of first filter screen.

Carefully, the inside of first defeated material pipe fitting is including the defeated material side pipe of type of falling L, and the fixed inside of cup jointing in screening box middle part one side in the defeated material side pipe top of type of falling L, the inside joint of the defeated material side pipe top one side of type of falling L has the second adjustable fender.

Carefully, the inside of the compound box of selection by winnowing is including accomodating the box, and the square transition pipe of bottom fixedly connected with of accomodating the box, the fixed cover in both sides of square transition socle portion has connect coarse cereals conveying pipeline and ventilation transition pipe respectively.

Carefully, the inside of blast air part is including three group blast air pumps, and the equal fixedly connected with exhaust valve pipe of outlet duct of three group blast air pumps, the inside of ventilation transition pipe one side is cup jointed to the exhaust valve pipe one end of blast air part inside.

Carefully, arrange the inside of material part including the transmission shaft, and the inboard of transmission shaft is fixed the cover respectively and has been connect baffle and comb strip, the equal activity of transmission shaft, baffle, comb strip cup joints the inboard at square transition pipe top, baffle and comb strip mutually perpendicular, the surface of comb strip and the inner wall swing joint at square transition pipe top, the inner wall at square transition pipe top is cup jointed with the state activity that runs through to the one end of transmission shaft, and the small-size step motor of terminal surface fixedly connected with of transmission shaft one end.

Carefully, two reciprocating power unit's inside all includes a power shaft, and two power shafts activity respectively cup joints the inboard at screening box top and the inboard of bottom, two the middle part of power shaft all fixedly cup joints a cam, and the equal fixedly connected with servo motor of one end of two power shafts, and two servo motor's the equal fixedly connected with support in bottom, two the equal fixedly connected with in one side of the support of servo motor bottom is in the side of compound screening case opposite side.

The selection, the inside of pnematic aggregate part is including the tuber pipe, and the fixed inside of cup jointing at screening box middle part opposite side of one end of tuber pipe, the fixed cover of the other end of tuber pipe has connect the cavity board, the fixed inside cup joint of cavity board one side has the conveyer pipe, the supplementary air-blowing pump of one end fixedly connected with of conveyer pipe.

The invention has the following beneficial effects:

1. the composite screening box, the first screening plate, the second screening plate, the first material conveying pipe fitting, the pneumatic aggregate part and the two sets of reciprocating power mechanisms are matched and assembled to form the composite multifunctional screening mechanism, and in the subsequent use process, large-sized stone sundries can be screened initially, small coarse cereal particles and small stone sundries can be screened again, coarse cereal particles full of conveyed particles and the stone sundries with the same size contained in the coarse cereal particles can be automatically conveyed, the use range is expanded fully, long-distance transfer time among multiple devices does not need to be transmitted, and the processing efficiency is improved.

2. The winnowing composite box body, the discharging component and the air blowing component are matched with each other to form a quantitative winnowing and stone removing mechanism, and during subsequent use, the flat space structure at the bottom of the winnowing composite box body and the use effect of intermittent material release of the discharging component are utilized to finally enable coarse cereal particles to be selected and screened to enter a winnowing area manufactured by the air blowing component in a linear arrangement manner, so that the phenomenon that the materials are discharged to form a pile-shaped falling state and some stone impurities are impacted to a placing area of the coarse cereals is avoided, and the screening accuracy is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a rear view of the present invention;

FIG. 3 is a schematic cross-sectional view of the composite screening box of the present invention;

FIG. 4 is a schematic cross-sectional view of the composite box body for air separation according to the present invention;

FIG. 5 is an enlarged schematic view of the structure of FIG. 2A according to the present invention.

In the figure: 1. a base; 2. a composite screening box; 21. screening a box body; 22. a first movable baffle; 3. a first screening plate; 31. a first screening frame plate; 32. a first filter screen; 33. a first T-bar; 34. a first positioning strap; 35. a first compression spring; 4. a first screening plate; 41. a second screening frame plate; 42. a second filter screen; 43. a second T-bar; 44. a second positioning strap; 45. a second compression spring; 5. a first delivery pipe fitting; 51. pouring an L-shaped material conveying square pipe; 52. a second movable baffle; 6. a second material conveying pipe fitting; 7. winnowing compound box body; 71. a storage box body; 72. a square transition tube; 73. a coarse cereal conveying pipe; 74. a ventilation transition duct; 8. a blower member; 9. a discharge member; 91. a drive shaft; 92. a partition plate; 93. carding; 10. a T-shaped bracket; 11. a reciprocating power mechanism; 111. a power shaft; 112. a cam; 113. a servo motor; 12. a pneumatic aggregate component; 121. an air duct; 122. a hollow plate; 123. a delivery pipe; 124. and an auxiliary air blowing pump.

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 and 2, a coarse cereal screening and stone removing cleaning machine comprises a base 1, a composite screening box 2 is arranged at the top of one side of the base 1, a screening box body 21 is arranged inside the composite screening box 2, the bottom of the screening box body 21 is of a conical structure, a first movable baffle 22 is clamped on the inner wall of the top of the screening box body 21, the first movable baffle 22 and the inner side of the top of the screening box body 21 are installed through screws, the first movable baffle 22 is arranged to provide an abdicating space for collecting residual screening materials inside the subsequent screening box body 21, a first screening plate 3 and a second screening plate 4 are sleeved on the inner side of the top and the inner side of the bottom of the composite screening box 2, a first screening frame plate 31 is arranged inside the first screening plate 3, the first screening frame plate 31 is clamped on the inner side of the top of the screening box body 21, a first filter screen 32 is fixedly sleeved on the inner side of the first screening frame plate 31, the top surfaces of two sides of the first screening frame plate 31 are fixedly connected with first T-shaped rods 33, the inner side of the top of the first T-shaped rods 33 is movably sleeved with first positioning sleeve strips 34, the first positioning sleeve strips 34 are fixedly sleeved inside the screening box body 21, first compression springs 35 are arranged between the bottom surface of the first positioning sleeve strips 34 and the top surface of the first screening frame plate 31, the first screening plate 3 provides operation conditions for the primary screening of subsequent materials, the application range of the device is expanded, the inside of the second screening plate 4 comprises a second screening frame plate 41, the second screening frame plate 41 is clamped on the inner side of the bottom of the screening box body 21, the inner side of the second screening frame plate 41 is fixedly sleeved with a second filter screen 42, the top surfaces of two sides of the second screening frame plate 41 are fixedly connected with second T-shaped rods 43, the inner side of the top of the second T-shaped rods 43 is movably sleeved with second positioning sleeve strips 44, the second positioning sleeve strip 44 is fixedly sleeved inside the screening box body 21, a second compression spring 45 is arranged between the bottom surface of the second positioning sleeve strip 44 and the top surface of the second screening frame plate 41, the mesh number of the second filter screen 42 is larger than that of the first filter screen 32, the second screening plate 4 provides operating conditions for secondary screening of subsequent materials, the application range of the device is further expanded, reciprocating power mechanisms 11 are arranged at the bottom of the second screening plate 4 and the bottom of the first screening plate 3, the two reciprocating power mechanisms 11 respectively comprise a power shaft 111, the two power shafts 111 are respectively movably sleeved at the inner side of the top and the inner side of the bottom of the screening box body 21, a cam 112 is fixedly sleeved at the middle parts of the two power shafts 111, one ends of the two power shafts 111 are fixedly connected with servo motors 113, the bottoms of the two servo motors 113 are respectively and fixedly connected with a support, one side of the supports at the bottoms of the two servo motors 113 is fixedly connected with the side of the other side of the composite screening box 2, the composite type primary screening box 2, the first screening plate 3, the second screening pipe fitting 4, the first servo motor pipe fitting 5, the support of the two sets of the composite type pneumatic stone particle screening pipes 12 is fixedly connected with a support, the composite type pneumatic particle screening mechanism, the multi-functional coarse cereal grain self-particle screening mechanism can be used for realizing mutual assembly and realizing the mutual small-conveying mechanism for the large-grain and the small-particle self-conveying mechanism for the large-grain and the large-grain self-conveying coarse cereal grain and the large-grain self-particle screening coarse cereal grain screening of the large-grain and the large-grain self-grain screening coarse cereal grain and the large-grain self-particle self-conveying mechanism,

please refer to fig. 3, fig. 4, one side and the bottom at the middle part of the composite screening box 2 are connected with the first material conveying pipe fitting 5 and are provided with the second material conveying pipe fitting 6 respectively, the inside of the first material conveying pipe fitting 5 is including the material conveying square pipe 51 of the type of falling L, and one side of the material conveying square pipe 51 top of the type of falling L is fixed to be cup jointed in the inside of one side at the middle part of the screening box 21, the inside joint of the material conveying square pipe 51 top one side of the type of falling L has the second adjustable fender 52, the first material conveying pipe fitting 5 provides the space that flows for the automatic material after the screening of the follow-up device, so as to realize smoothly, one side fixedly connected with T-shaped support 10 of the second material conveying pipe fitting 6.

Please refer to 5,T type bracket 10, one side and the bottom of the top are respectively connected with a winnowing compound box 7 and a top surface fixedly connected to the middle part of the base 1, the winnowing compound box 7 includes a storage box 71, the bottom of the storage box 71 is fixedly connected with a square transition pipe 72, two sides of the bottom of the square transition pipe 72 are respectively fixedly sleeved with a coarse cereal conveying pipe 73 and a ventilation transition pipe 74, the winnowing compound box 7 provides storage and operation space for subsequent storage and wind selection of materials to be screened, the inner side of the bottom of the winnowing compound box 7 is sleeved with a blast component 8, the blast component 8 includes three sets of blast pumps, the air outlet pipes of the three sets of blast pumps are all fixedly connected with an exhaust valve pipe, one end of the exhaust valve pipe inside the blast component 8 is fixedly sleeved inside one side of the ventilation transition pipe 74, a corresponding number of the blast pumps inside the blast component 8 are started, the forced air flow of the air blowing pump enters the containing box body 71 in the air separation composite box body 7 in a advective state through the ventilation transition pipe 74, thereby realizing the construction of an air separation region, the bottom of the air separation composite box body 7 is respectively sleeved with the material discharging component 9 and is provided with the air blowing component 8, the inside of the material discharging component 9 comprises a transmission shaft 91, the inner side of the transmission shaft 91 is respectively and fixedly sleeved with a partition plate 92 and a comb strip 93, the transmission shaft 91, the partition plate 92 and the comb strip 93 are movably sleeved on the inner side of the top of the square transition pipe 72, the partition plate 92 is mutually vertical to the comb strip 93, the surface of the comb strip 93 is movably connected with the inner wall of the top of the square transition pipe 72, one end of the transmission shaft 91 is movably sleeved on the inner wall of the top of the square transition pipe 72 in a penetrating state, the end face of one end of the transmission shaft 91 is fixedly connected with a small-sized stepping motor, the air separation composite box body 7, the material discharging component 9, after the blast air parts 8 are mutually matched, a quantitative winnowing and stone removing mechanism can be formed, the flat space structure at the bottom of the winnowing composite box 7 and the intermittent material releasing using effect of the material discharging parts 9 are utilized in the subsequent using process, finally, coarse cereal particles to be selected and screened enter a winnowing area manufactured by the blast air parts 8 in a linear arrangement mode, the phenomenon that the materials fall in a piled form due to flowing and discharging is avoided, the pneumatic aggregate parts 12 are installed on the other side of the middle part of the composite screening box 2, the pneumatic aggregate parts 12 are arranged inside the composite screening box 21, one end of the air pipe 121 is fixedly sleeved inside the other side of the middle part of the screening box 21, the hollow plate 122 is fixedly sleeved at the other end of the air pipe 121, the conveying pipe 123 is fixedly sleeved inside one side of the hollow plate 122, and one end of the conveying pipe 123 is fixedly connected with the auxiliary air blowing pump 124.

The working principle is as follows: when in use, the method is carried out by a plurality of steps, and the method comprises the following steps:

a first step, pouring the raw material of non-screened coarse cereal grains into the inner side of the top of the composite screening box 2, scattering the coarse cereal grains on the top surfaces of the first screening frame plate 31 and the first T-shaped rod 33 in the first screening plate 3, starting the servo motors 113 in the two reciprocating power mechanisms 11, driving the power shafts 111 by the two servo motors 113 through the cams 112 connected with each other to respectively impact the first screening frame plate 31 in the first screening plate 3 and the second screening frame plate 41 in the second screening plate 4 in a reciprocating manner, then, under the action of the reaction force of the elastic reset structure consisting of the first T-shaped rod 33, the first positioning sleeve strip 34 and the first compression spring 35 connected with the first screening frame plate 31, a vibration screening mode is carried out, and similarly, the second screening frame plate 41 also enters the vibration screening mode under the operation of the reaction force of the elastic reset structure consisting of the second T-shaped rod 43, the second positioning sleeve strip 44 and the second compression spring 45 which are connected with the second screening frame plate, so that coarse cereal particles and stone impurities smaller than the meshes of the first filter screen 32 on the top surfaces of the first screening frame plate 31 and the first T-shaped rod 33 are screened and dropped to the top surfaces of the second screening frame plate 41 and the second filter screen 42, and similarly, coarse cereal particles and stone impurities smaller than the meshes of the second filter screen 42 are screened and dropped to the bottom of the base 1 and finally flow into the second material conveying pipe fitting 6 and then reach a collecting container placed at the bottom of the second material conveying pipe fitting 6;

a second step, after the screening is finished, the top surfaces of the second screening frame plate 41 and the second filter screen 42 leave full coarse cereal grains and the stone impurities with the same size contained in the coarse cereal grains, the second movable baffle plate 52 in the first material conveying pipe fitting 5 is pulled to enable one end of the second movable baffle plate to be flush with the side wall of the inverted-L-shaped material conveying square pipe 51, then the air 124 in the air-operated aggregate part 12 is started, air flow is generated by the air 124 forcibly and is conveyed to the inner part of the middle part of the composite screening box 2 through the conveying pipe 123, the hollow plate 122 and the air pipe 121, and tends to flow towards one end of the top of the inverted-L-shaped material conveying square pipe 51, and then the raw materials on the top surfaces of the second screening frame plate 41 and the second filter screen 42 and the stone impurities with the same size contained in the inner part enter the containing box body 71 in the composite box 7 through the inverted-L-shaped material conveying square pipe 51 under the blowing of the wind power drum;

the third step of the process

The corresponding number of air-blowing pumps in the air-blowing component 8 are started according to actual needs, airflow forcibly generated by the air-blowing pumps enters the accommodating box body 71 in the air-separation composite box body 7 in a advective state through the ventilation transition pipe 74, so that the construction of an air separation area is realized, after the construction is finished, a small stepping motor connected with the transmission shaft 91 in the material discharging component 9 is started, the transmission shaft 91, the partition plate 92 and the comb strip 93 rotate on the inner side of the top of the square transition pipe 72, then coarse cereal grains to be selected and screened enter an air separation area manufactured by the air-blowing component 8 in a linear arrangement manner, and the coarse cereal grains and the stone impurities with the same size are different in weight and flow out to a designated container through the coarse cereal conveying pipe 73 by utilizing the principle of point-to-ground separation under the same level wind power, and the stone impurities with the same size flow out through the square transition pipe 72.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Meanwhile, in the drawings of the present invention, the filling pattern is only for distinguishing the layer, and is not limited to any other.

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 stone descaling machine is sieved to coarse cereals, includes base (1), its characterized in that: the top of one side of the base (1) is provided with a composite screening box (2), the inner side of the top of the composite screening box (2) and the inner side of the bottom are sleeved with a first screening plate (3) and a second screening plate (4), the bottom of the second screening plate (4) and the bottom of the first screening plate (3) are both provided with a reciprocating power mechanism (11), one side and the bottom of the middle part of the composite screening box (2) are respectively connected with a first material conveying pipe fitting (5) and provided with a second material conveying pipe fitting (6), one side of the second material conveying pipe fitting (6) is fixedly connected with a T-shaped bracket (10), one side and the bottom of the top of the T-shaped bracket (10) are respectively connected with a winnowing composite box body (7) and a top surface fixedly connected with the middle part of the base (1), the inner side of the bottom of the composite box body (7) is sleeved with an air blowing part (8), the respective bottoms of the winnowing composite box body (7) are respectively sleeved with a discharging part (9) and provided with a material discharging part (8), the air blowing part (9), the inner side of the composite screening box body (9) is sleeved with a transmission shaft (91), the inner side of the transmission shaft (92) and a square partition plate (93) and a square partition board (93) which are respectively connected with the blowing partition board (93), the surface of sliver (93) and the inner wall swing joint at square transition pipe (72) top, the inner wall at square transition pipe (72) top is cup jointed in order to run through the state activity of the one end of transmission shaft (91), and the small-size step motor of terminal surface fixedly connected with of transmission shaft (91) one end, pnematic aggregate component (12) are installed to the opposite side at composite screening case (2) middle part.

2. The coarse cereal screening, stone-removing and cleaning machine according to claim 1, characterized in that: the inside of compound screening case (2) is including screening box (21), and the bottom of screening box (21) is the toper structure, the inner wall joint at screening box (21) top has first adjustable fender (22), through the screw installation between the inboard at first adjustable fender (22) and screening box (21) top.

3. The coarse cereal screening, stone-removing and cleaning machine according to claim 2, characterized in that: the inside of first screening plate (3) is including first screening frame board (31), and first screening frame board (31) joint is in the inboard at screening box (21) top, the inboard fixed cup joint of first screening frame board (31) has first filter screen (32), the first T type pole (33) of top surface fixedly connected with of first screening frame board (31) both sides, first location nook (34) have been cup jointed in the inboard activity at first T type pole (33) top, first location nook (34) are fixed to be cup jointed in the inside of screening box (21), install first compression spring (35) between the bottom surface of first location nook (34) and the top surface of first screening frame board (31).

4. The coarse cereal screening and stone-removing cleaning machine as claimed in claim 2 or 3, characterized in that: the inside of second screening plate (4) is including second screening frame board (41), and second screening frame board (41) joint is in the inboard of screening box (21) bottom, the inboard fixed second filter screen (42) that has cup jointed of second screening frame board (41), the top surface fixedly connected with second T type pole (43) of second screening frame board (41) both sides, second location noose (44) have been cup jointed in the inboard activity at second T type pole (43) top, second location noose (44) are fixed to be cup jointed in the inside of screening box (21), install second compression spring (45) between the bottom surface of second location noose (44) and the top surface of second screening frame board (41), the mesh number of second filter screen (42) is greater than the mesh number of first filter screen (32).

5. The coarse cereal screening, stone-removing and cleaning machine according to claim 2, characterized in that: the inside of first defeated material pipe fitting (5) is including the defeated material side pipe of type of falling L (51), and the fixed inside of cup jointing in screening box (21) middle part one side in one side at the defeated material side pipe of type of falling L (51) top, the inside joint of the defeated material side pipe of type of falling L (51) top one side has second adjustable fender (52).

6. The coarse cereal screening, stone-removing and cleaning machine according to claim 1, characterized in that: the inside of the composite winnowing box body (7) comprises a containing box body (71), a square transition pipe (72) is fixedly connected to the bottom of the containing box body (71), and a coarse cereal conveying pipe (73) and a ventilation transition pipe (74) are fixedly sleeved on two sides of the bottom of the square transition pipe (72) respectively.

7. The coarse cereal screening, stone-removing and cleaning machine according to claim 6, characterized in that: the inside of blast air part (8) is including three sets of blast air pumps, and the equal fixedly connected with exhaust valve pipe of outlet duct of three sets of blast air pumps, the inside of ventilation transition pipe (74) one side is fixed cup jointed at the inside of exhaust valve pipe one end of blast air part (8) inside.

8. The coarse cereal screening, stone-removing and cleaning machine according to claim 2, characterized in that: two the inside of reciprocal power unit (11) all includes a power axle (111), and two power axles (111) activity respectively cup joints the inboard at screening box (21) top and the inboard of bottom, two the middle part of power axle (111) all is fixed to cup joint one cam (112), and the equal fixedly connected with servo motor (113) of one end of two power axles (111), and two the equal fixedly connected with support in bottom of servo motor (113), two the equal fixed connection in side of compound screening case (2) opposite side in one side of the support of servo motor (113) bottom.

9. The coarse cereal screening, stone-removing and cleaning machine according to claim 1, characterized in that: the inside of pnematic aggregate part (12) is including tuber pipe (121), and the fixed cover of one end of tuber pipe (121) connects in the inside of screening box (21) middle part opposite side, the fixed cover of the other end of tuber pipe (121) has connect well hollow plate (122), the fixed cover in inside of well hollow plate (122) one side has connect conveyer pipe (123), supplementary air-blowing pump (124) of one end fixedly connected with of conveyer pipe (123).