CN217313532U - Winnowing box for agricultural product processing and rice milling machine comprising same - Google Patents

Abstract

The utility model relates to a winnowing box for processing agricultural products and a rice milling machine comprising the same, wherein the winnowing box comprises an outer shell, the outer shell comprises a top plate, two side plates and a feeding end plate, and a guide plate is connected between the two side plates; the upper part of the feeding end plate is connected with a feeding pipe in a penetrating way, and the inner end of the feeding pipe is higher than the outer end so as to lead the feeding to the top plate; the guide plate comprises a first guide plate, a second guide plate, a third guide plate and a fourth guide plate, the inclination direction of the first guide plate is the same as that of the feeding pipe, a baffle plate extending downwards is arranged on a top plate above the higher end of the first guide plate, and a first shell outlet gap is formed between the lower edge of the baffle plate and the first guide plate; the second guide plate is opposite to the first guide plate in the inclination direction and is connected below the first guide plate; the third and the fourth guide plates have the same inclination direction as the first guide plate and are sequentially supported below the second guide plate, and the higher end of the fourth guide plate is higher than the third guide plate and has a second shell outlet gap with the first guide plate. This winnowing box is convenient to be connected with centrifugal rice huller and is used, and the separation effect is better.

Description

Winnowing box for agricultural product processing and rice milling machine comprising winnowing box

Technical Field

The utility model belongs to the technical field of the cereal preliminary treatment of milling in the operation transportation, concretely relates to winnowing box and contain rice machine of beating of this winnowing box for agricultural product processing.

Background

The rice milling machine is a common device for rice production and processing, and generally comprises a rice huller, a rice husk separating box (winnowing box) and a rice mill, wherein the rice huller is used for hulling rice to prepare brown rice, the rice husk separating box is used for separating the separated brown rice from the hull, and the surface of the brown rice is milled by the rice mill to prepare polished rice for daily use. At present, the traditional rice huller mostly adopts two or three rubber rolls rotating in opposite directions, utilizes the clearance between the rubber rolls to extrude and hulle the rice, in order to improve the compactness of the structure of the rice huller, the rubber rolls of the rice huller are directly integrated and installed in a rice hull separating box, and the extruded and hulled brown rice and rice hulls are directly separated by wind power, like the prior art of CN 207786677U, the structure is disclosed.

However, the method for extruding and shelling the rice by using the rubber roller has the following defects: the clearance is required to be adjusted frequently, the clearance adjustment is too large, the hulling rate is low, and the rice is easy to crush when the clearance adjustment is too small; the requirement on the dryness and humidity of the rice is high, and the rice is easily squeezed into rice cakes when the humidity is high; in addition, the rubber roller is easy to grind a groove, and the rice output effect is influenced. In order to solve the technical problems, centrifugal rice hullers are provided, and the prior art such as CN109174257A and CN106076456A are related. In the centrifugal rice huller disclosed in CN109174257A, the first husking rubber disc and the second husking rubber disc in the outer shell are respectively disposed at two sides of the husking impeller, and are arranged oppositely, so that the collision rate with rice is low, the husking effect is limited, and correspondingly, the outlet on the outer shell is not a tangential outlet. CN106076456A discloses a centrifugal rice huller, in which rice grains first move radially outward by a slide guide surface 16 of a blade body 14, then sequentially hit a posture changing surface 26, a collision surface 20, and a throwing action surface 28 on an outer end (inner hulling section) of the blade body 14 and then collide with a rubber ring, the mechanism and installation of the blade body 14 are complicated, and since rice grains in the centrifugal rice huller first move radially outward along the slide guide surface 16 at the beginning of centrifugation, in order to ensure a hulling ratio, it is required that "a downstream end in a rotation direction of the inner hulling section is located at a position closer to a downstream side in the rotation direction than an upstream end in the rotation direction of the blade body adjacent to the downstream side in the rotation direction of the inner hulling section", that is, that an outer end of the blade body has an overlapping portion, which results in a large number of blade bodies, and increases installation difficulty and cost. The applicant improves the existing centrifugal rice huller, but needs to design a winnowing box more suitable for receiving the husked brown rice and rice husks of the centrifugal rice huller, and further improves the separation effect.

Disclosure of Invention

The above-mentioned not enough to prior art, the to-be-solved technical problem of the utility model is to provide an air separation box for agricultural product processing and contain the rice huller of this air separation box, avoid the air separation box of separating brown rice and chaff at present not be suitable for the problem of using with centrifugal rice huller cooperation, gain with the higher, better effect of separation effect of suitability of centrifugal rice huller.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the winnowing box for processing the agricultural products comprises a rectangular outer shell, wherein the outer shell comprises a top plate, two opposite side plates, a feeding end plate and a sealing end plate opposite to the feeding end plate, and a plurality of guide plates are connected between the two side plates; the feeding end plate is provided with a feeding pipe, the feeding pipe is obliquely arranged, the inner end of the feeding pipe is higher than the outer end of the feeding end plate so as to lead the feeding to a top plate, the plurality of guide plates comprise a first guide plate, a second guide plate, a third guide plate and a fourth guide plate, the first guide plate is obliquely arranged, the oblique direction of the first guide plate is the same as that of the feeding pipe, a baffle plate extending downwards is arranged on the inner wall of the top plate above the higher end of the first guide plate so as to block the feeding which leads to the top plate, and a first shell outlet gap is formed between the lower edge of the baffle plate and the first guide plate; the second guide plate is obliquely arranged and the oblique direction of the second guide plate is opposite to that of the first guide plate, and the second guide plate is connected below the lower end of the first guide plate so as to receive the feed sliding down along the first guide plate; the higher end of the second guide plate is abutted with the feeding end plate; the third guide plate and the fourth guide plate are obliquely arranged and have the same oblique direction as the first guide plate, and the third guide plate faces to the lower end of the second guide plate so as to receive the feed sliding down along the second guide plate; the fourth guide plate and the third guide plate are arranged at intervals and are positioned below the third guide plate, the higher end of the fourth guide plate is higher than the third guide plate, and a second shell outlet gap is formed between the higher end of the fourth guide plate and the first guide plate; a gap is formed between the higher ends of the first guide plate and the fourth guide plate and the sealing end plate to form a shell outlet channel; the lower part of the outer shell is provided with a rice outlet and a shell outlet fan air inlet, the rice outlet is close to the feeding end plate and is connected below the third guide plate and the fourth guide plate, and the shell outlet fan air inlet is close to the sealing end plate and is communicated below the shell outlet channel.

Further perfecting the technical proposal, a transition stopper is arranged between the third guide plate or the fourth guide plate and the rice outlet.

Furthermore, a sealing plate for separating the rice outlet from the air inlet of the shell outlet fan is arranged below the fourth guide plate.

The utility model also relates to a rice husking machine, which comprises the winnowing box for processing agricultural products, wherein the outer end of the feeding pipe of the winnowing box is connected with a centrifugal rice huller through a flexible pipe; the centrifugal rice huller comprises a radially split shell cover, a tangential outlet is formed in the outer circumference of the shell, the outer end of a feeding pipe is communicated with the tangential outlet through a flexible pipe, a circle of replaceable hulling rubber ring is fully paved and fixed on the inner wall of the outer circumference of the shell, and a breaking notch is formed in the hulling rubber ring corresponding to the tangential outlet so as to facilitate rice discharging; the rice huller is characterized in that a coaxial rotating shaft extends into the shell along the axis of the shell and is connected with a hulling impeller assembly in the shell in a driving manner, the rotating shaft is externally connected with a feeding device, a rice discharging inner sleeve sleeved outside the rotating shaft is fixedly arranged in the shell, and a radial discharging hole is formed in the rice discharging inner sleeve so that rice fed along the rotating shaft can be discharged in the radial outward direction; the shelling impeller assembly is positioned between the rice discharging inner sleeve and the shelling rubber ring; the shelling impeller assembly comprises two blade mounting plates which are axially arranged along a rotating shaft at intervals, the two blade mounting plates are parallel and right opposite, the radial discharge port is located between the two blade mounting plates, a plurality of blade bodies which are uniformly distributed in the circumferential direction are connected between the two blade mounting plates, each blade body comprises a main body plate which extends in the radial direction, the outer end of each main body plate is connected with a collision plate which extends in the radial direction outwards and towards the downstream side of the rotating direction in an inclined mode, and the inner end of each main body plate is connected with a guide plate which extends in the radial direction inwards and towards the downstream side of the rotating direction in an inclined mode.

Furthermore, the intersection position of the upstream side surface of the rotating direction of the guide plate and the main body plate is transited through a raised arc section.

Further, the main part board extends respectively towards the both sides of two blade mounting panels and is equipped with connecting portion, run through on the blade mounting panel be equipped with the spoke hole that connecting portion correspond, connecting portion extend into corresponding spoke downthehole.

Further, the number of the blade bodies is eight, and the length of the guide plate is one third to one half of that of the main body plate.

Further, guide plate, main part board and collision board structure as an organic whole.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses a winnowing box for agricultural product processing has set up the inlet pipe of the slope of being convenient for external connection, conveniently connects centrifugal rice huller, under centrifugal rice huller separation back mix the brown rice and chaff together, under the effect of centrifugal rice huller air supply power, high-speed from the inlet pipe entering winnowing box, access to the roof, after the baffle blocks, fall back to first guide plate, under the action of gravity, brown rice and chaff are along first guide plate landing, chaff density, weight are less than brown rice, in this process, some chaff is drawn out by the fan through first play shell clearance, play shell passageway, play shell fan air intake; the brown rice and the residual chaff slide down along the first guide plate and are received by the second guide plate which is inclined reversely, the brown rice and the residual chaff continuously slide down along the second guide plate and are received by the third guide plate, the third guide plate is shorter (the height of the higher end is lower) than that of the fourth guide plate, part of the brown rice and the chaff can pass through the higher end of the third guide plate and are received by the fourth guide plate, and in the process, most of the chaff is sucked out by the fan through the second chaff outlet gap, the chaff outlet channel and the air inlet of the chaff outlet fan; the remaining brown rice on the third guide plate and the fourth guide plate continuously slides down and is sent out through a rice outlet; therefore, the brown rice and the chaff entering the air separation box are subjected to multi-stage separation, and the separation effect is better.

2. The utility model discloses a rice huller has also improved centrifugal rice huller, has increased in the inner of blade along radial inside guide board that extends towards direction of rotation downstream side slant simultaneously, can avoid the corn to extrude the back from radial discharge gate, directly follows the radial guide of main part board, does not contact the board contact and directly reachs the shelling rubber ring. When the rice huller is used, the feeding of the feeding device and the hulling impeller assembly share one rotating shaft, the feeding speed is high, after the guide plate is arranged, when rice is extruded from the radial discharge port, the rice can collide with the guide plate (one surface on the upstream side in the rotating direction) firstly and then is supported by the main body plate of the adjacent blade body on the downstream side in the rotating direction, under the action of centrifugal force, the rice continuously collides with the collision plate to play an inner hulling effect, and after being thrown out, the rice collides with the hulling rubber ring to play an outer hulling effect, so that the effective hulling times can be guaranteed; therefore, on the whole, the equivalent shelling rate can be basically guaranteed, and meanwhile, the number of the blade bodies is reduced, so that the cost is reduced, and the installation and the maintenance are more convenient.

Drawings

FIG. 1 is a schematic structural view of a rice mill according to an embodiment;

fig. 2 is a schematic view of the air separation box in the rice mill of fig. 1 (with the front housing portion hidden for ease of illustration);

fig. 3 is a perspective view of the air separation box of fig. 2;

fig. 4 is a perspective view of another perspective view of the air separation box of the embodiment;

fig. 5 is a schematic structural view of a centrifugal rice huller in the rice huller according to the embodiment (for convenience of illustration, the shell cover is hidden);

FIG. 6 is a schematic view of the blade mounting plate further removed from the front (to facilitate illustration of the blade body) from FIG. 5;

FIG. 7 is a view of FIG. 6 with the blade bodies further hidden from view at an axial angle (to facilitate the illustration of a radial discharge port);

fig. 8 is an exploded view illustrating a connection relationship between a blade mounting plate and a blade body in the centrifugal rice huller according to the embodiment;

fig. 9 is an explanatory view of the effect of the centrifugal rice huller according to the embodiment;

the agricultural product processing winnowing box 100, the flexible pipe 200, the centrifugal rice huller 300, the top plate 51, the side plate 52, the feeding end plate 53, the sealing end plate 54, the feeding pipe 6, the first guide plate 71, the second guide plate 72, the third guide plate 73, the fourth guide plate 74, the baffle 75, the transition stopper 76, the closing plate 77, the first husking gap 81, the second husking gap 82, the husking channel 83, the husking fan air inlet 84, the rice outlet 9, the shell 1, the tangential outlet 11, the rice discharging inner sleeve 12, the radial discharge port 121, the husking rubber ring 2, the breaking notch 21, the rotating shaft 3, the husking impeller assembly 4, the blade mounting plate 41, the spoke holes 411, the blade body 42, the guide plate 421, the main body plate 422, the collision plate 423, the arc-shaped section 424 and the connecting part 425.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the attached drawings.

Referring to fig. 1 to 4, an air separation box 100 for processing agricultural products in an embodiment includes a rectangular outer casing, the outer casing includes a top plate 51, two opposite side plates 52, a feeding end plate 53, and a sealing end plate 54 opposite to the feeding end plate 53, a plurality of guide plates are connected between the two side plates 52, and two sides of each guide plate are abutted to inner walls of the corresponding side plate 52; the upper part of the feeding end plate 53 is connected with a feeding pipe 6 in a penetrating way, the feeding pipe 6 is arranged in an inclined way, the inner end of the feeding end plate is higher than the outer end of the feeding pipe 6 so as to lead feeding materials (the feeding materials are brown rice and chaff separated by a centrifugal rice huller) to the top plate 51, the plurality of guide plates comprise a first guide plate 71, a second guide plate 72, a third guide plate 73 and a fourth guide plate 74, the first guide plate 71 is arranged in an inclined way, the inclined direction of the first guide plate is the same as that of the feeding pipe 6, a baffle plate 75 extending downwards is arranged on the inner wall of the top plate 51 above the higher end of the first guide plate 71, two sides of the baffle plate 75 are abutted against the inner wall of the side plate 52 on the corresponding side, the plate surface of the baffle plate 75 faces the feeding pipe 6 so as to block the feeding materials which are led to the top plate 51, and a first shelling gap 81 is arranged between the lower edge of the baffle plate 75 and the first guide plate 71;

the second guide plate 72 is arranged obliquely and the oblique direction is opposite to that of the first guide plate 71, and the plate surface of the second guide plate 72 faces and is received below the lower end of the first guide plate 71 so as to receive the feed sliding down along the first guide plate 71; the higher end of the second guide plate 72 is abutted against the feeding end plate 53;

the third guide plate 73 and the fourth guide plate 74 are both arranged obliquely and have the same oblique direction as the first guide plate 71, and the third guide plate 73 faces the lower end of the second guide plate 72 so as to receive the feeding material sliding down along the second guide plate 72; the fourth guide plate 74 and the third guide plate 73 are arranged at intervals and are positioned below the third guide plate 73, the higher end of the fourth guide plate 74 is higher than the higher end of the third guide plate 73, and a second shell-out gap 82 is formed between the higher end of the fourth guide plate 74 and the first guide plate 71; a gap is formed between the higher ends of the first guide plate 71 and the fourth guide plate 74 and the sealing end plate 54 to form a shell outlet passage 83; the first shell outlet gap 81 and the second shell outlet gap 82 are communicated with the shell outlet channel 83;

the lower part of the outer shell is provided with a rice outlet 9 and a shell outlet fan air inlet 84, the rice outlet 9 is close to the feeding end plate 53 and is connected below the third guide plate 73 and the fourth guide plate 74, and the shell outlet fan air inlet 84 is close to the sealing end plate 54 and is communicated below the shell outlet channel 83. It will be appreciated that the husk outlet blower inlet 84 is externally connected to a blower (not shown) for providing separated wind force to the husk in the feed material through the first husk outlet gap 81, the second husk outlet chamber, the husk outlet passage 83 and the husk outlet blower inlet 84.

The winnowing box 100 for processing agricultural products of the embodiment is provided with the inclined feeding pipe 6 convenient for external connection, is convenient to connect with the centrifugal rice huller 300, is convenient for connecting with brown rice and rice husks which are mixed together after being separated by the centrifugal rice huller 300, enters the winnowing box from the feeding pipe 6 at a high speed under the action of air supply of the centrifugal rice huller 300, leads to the top plate 51, falls back to the first guide plate 71 after being blocked by the baffle plate 75, and slides down along the first guide plate 71 under the action of gravity, wherein the density and the weight of the rice husks are less than those of the brown rice, and in the process, part of the rice husks are sucked out of the fan through the first husk outlet gap 81, the husk outlet channel 83 and the husk outlet fan air inlet 84; the brown rice and the residual chaff slide along the first guide plate 71, are received by the second guide plate 72 which is inclined reversely, continue to slide along the second guide plate 72, are received by the third guide plate 73, the third guide plate 73 is shorter (the higher end is lower in height) than the fourth guide plate 74, part of the brown rice and the chaff pass through the higher end of the third guide plate 73 and are received by the fourth guide plate 74, and in the process, most of the chaff is sucked out by the fan through the second chaff outlet gap 82, the chaff outlet channel 83 and the chaff outlet fan air inlet 84; the remaining brown rice on the third guiding plate 73 and the fourth guiding plate 74 slides off continuously and is sent out through the rice outlet 9; therefore, the brown rice and the chaff entering the air separation box are subjected to multi-stage separation, and the separation effect is better.

Wherein a transition stopper 76 is arranged between the third guide plate 73 or the fourth guide and the rice outlet 9.

Thus, the separation effect can be further improved by adding one more impact process.

Wherein, a closing plate 77 for separating the rice outlet 9 from the shell outlet fan air inlet 84 is arranged below the fourth guide plate 74.

Thus, for improving the function design, the sealing performance of the lower part of the discharging channel 83 is ensured, and the discharging effect is prevented from being influenced.

During implementation, the higher end of the fourth guiding plate 74 can also be bent upwards to form a blocking part forming an included angle of 90 degrees with the plate surface, so that the brown rice is prevented from falling into the second husk outlet gap 82.

With continuing reference to fig. 1 and fig. 5-9, the present invention further provides a rice huller, comprising the above-mentioned winnowing box 100 for agricultural product processing, wherein the outer end of the feeding pipe is connected to a centrifugal rice huller 300 through a flexible pipe 200; the centrifugal rice huller 300 comprises a radially split shell cover of a shell 1, wherein a tangential outlet 11 is formed in the outer circumference of the shell 1, a circle of replaceable hulling rubber ring 2 is fully paved and fixed on the inner wall of the outer circumference of the shell 1, and a breaking gap 21 is formed in the position, corresponding to the tangential outlet 11, of the hulling rubber ring 2 so as to facilitate rice discharge; a coaxial rotating shaft 3 extends into the shell 1 along the axis of the shell 1, the rotating shaft 3 is connected with a hulling impeller assembly 4 in the shell 1 in a driving way, a feeding device (not shown in the figure) is connected outside the rotating shaft 3, a rice discharging inner sleeve 12 sleeved outside the rotating shaft 3 is fixedly arranged in the shell 1, and a radial discharge hole 121 is formed in the rice discharging inner sleeve 12 so that rice fed along the rotating shaft 3 can be discharged in the radial outward direction; in the radial direction, the shelling impeller assembly 4 is positioned between the rice discharging inner sleeve 12 and the shelling rubber ring 2; the shelling impeller assembly 4 comprises two blade mounting plates 41 arranged along the axial direction of the rotating shaft 3 at intervals, the two blade mounting plates 41 are oppositely arranged in parallel, the radial discharge hole 121 is positioned between the two blade mounting plates 41 in the axial direction of the rotating shaft 3, a plurality of blade bodies 42 uniformly distributed in the circumferential direction are connected between the two blade mounting plates 41, specifically, the blade bodies 42 are positioned between the rice discharge inner sleeve 12 and the shelling rubber ring 2, each blade body 42 comprises a main body plate 422 extending along the radial direction, the outer end of the main body plate 422 is connected with a collision plate 423 extending along the radial direction outwards and towards the downstream side in the rotating direction in an inclined mode, and the inner end of the main body plate 422 is connected with a guide plate 421 extending along the radial direction inwards and towards the downstream side in the rotating direction in an inclined mode. The free end of the guide plate 421 faces the inner rice discharging sleeve 12. A circumferential gap is provided between the end portion on the downstream side in the rotation direction of the entire blade body 42 and the end portion on the upstream side in the rotation direction of the adjacent blade body 42 on the downstream side in the rotation direction.

The utility model also improves the centrifugal rice huller in the rice huller, and adds the guide plate 421 which extends along the radial direction inwards and towards the downstream side of the rotation direction at the inner end of the blade body 42, thus avoiding the direct radial guide along the main body plate 422 after the rice is extruded from the radial discharge port 121 and directly reaching the hulling rubber ring 2 without the contact of the collision plate 423; referring to fig. 9, when in use, the feeding and hulling impeller assemblies 4 of the feeding device share one rotating shaft 3 (in the prior art), the feeding speed is also high, after the guide plate 421 is arranged, when the paddy is extruded from the radial discharge port 121, the paddy can collide with the guide plate 421 (one surface on the upstream side in the rotating direction) first, then the paddy is received by the main plate 422 of the adjacent blade 42 on the downstream side in the rotating direction, and under the action of centrifugal force, the paddy continuously collides with the collision plate 423 to play an inner hulling effect, and collides with the hulling rubber ring 2 after being thrown out to play an outer hulling effect, so as to ensure effective hulling collision times; thus, overall, the number of blade bodies 42 can be reduced while substantially ensuring an equivalent shelling rate, thereby reducing costs and facilitating installation and maintenance.

With continued reference to fig. 6 and 8, the intersection position of the upstream side of the rotation direction of the guide plate 421 and the main plate 422 is transited by a raised circular arc section 424.

Thus, the rice is slightly jumped up by the contact with the arc 424, and can be better guaranteed to be received by the main body plate 422 of the adjacent blade body 42 at the downstream, and the shelling collision effect is guaranteed.

The main body plate 422 is provided with connecting portions 425 extending towards two sides of the two blade mounting plates 41, the blade mounting plates 41 are provided with spoke holes 411 corresponding to the connecting portions 425 in a penetrating manner, and the connecting portions 425 extend into the corresponding spoke holes 411.

Therefore, the whole hulling impeller assembly 4 is convenient to install and simple and compact in structure.

In practice, the length and angle dimensions of the guiding plate 421 can be adapted to the actual operating conditions such as the rotating speed of the rotating shaft 3. Preferably, as in the present embodiment, the number of the blade bodies 42 may be eight, the length of the guide plate 421 is one third to one half of the length of the main body plate 422, the angle between the guide plate 421 and the main body plate 422 is 140 ° -150 °, and the angle between the collision plate 423 and the main body plate 422 is 130 ° -140 °.

The guide plate 421, the main body plate 422 and the collision plate 423 are of an integral structure, and can be integrally formed by injection molding of hard plastics, so that the manufacturing cost is reduced.

It will be appreciated that the rice milling machine may also include a rice mill (not shown in the figures, but prior art), the inlet of the rice mill receives the rice outlet 9 of the air separation box 100 for processing agricultural products, and the brown rice coming out from the rice outlet 9 of the air separation box 100 for processing agricultural products is sent to the rice mill, and is extruded and rubbed with the screen cylinder by the grinding roller to remove the peel, and then the rice used in daily life is sent out.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (8)

1. The winnowing box for processing the agricultural products comprises a rectangular outer shell, wherein the outer shell comprises a top plate, two opposite side plates, a feeding end plate and a sealing end plate opposite to the feeding end plate, and a plurality of guide plates are connected between the two side plates; the method is characterized in that: the feeding end plate is provided with a feeding pipe, the feeding pipe is arranged in an inclined mode, the inner end of the feeding pipe is higher than the outer end of the feeding pipe so as to lead feeding materials to a top plate, the plurality of guide plates comprise a first guide plate, a second guide plate, a third guide plate and a fourth guide plate, the first guide plate is arranged in an inclined mode, the inclined direction of the first guide plate is the same as that of the feeding pipe, a baffle extending downwards is arranged on the inner wall of the top plate above the higher end of the first guide plate so as to block feeding materials led to the top plate, and a first shell outlet gap is formed between the lower edge of the baffle and the first guide plate;

the second guide plate is obliquely arranged and the oblique direction of the second guide plate is opposite to that of the first guide plate, and the second guide plate is connected below the lower end of the first guide plate so as to receive the feed sliding down along the first guide plate; the higher end of the second guide plate is abutted with the feeding end plate;

the third guide plate and the fourth guide plate are obliquely arranged and have the same oblique direction as the first guide plate, and the third guide plate faces to the lower end of the second guide plate so as to receive the feed sliding down along the second guide plate; the fourth guide plate and the third guide plate are arranged at intervals and are positioned below the third guide plate, the higher end of the fourth guide plate is higher than the third guide plate, and a second shell outlet gap is formed between the higher end of the fourth guide plate and the first guide plate; a gap is formed between the higher ends of the first guide plate and the fourth guide plate and the sealing end plate to form a shell outlet channel;

the lower part of the outer shell is provided with a rice outlet and a shell outlet fan air inlet, the rice outlet is close to the feeding end plate and is connected below the third guide plate and the fourth guide plate, and the shell outlet fan air inlet is close to the sealing end plate and is communicated below the shell outlet channel.

2. The winnowing box for processing agricultural products of claim 1, wherein: a transition stopper is arranged between the third guide plate or the fourth guide plate and the rice outlet.

3. The winnowing box for processing agricultural products of claim 1, wherein: a sealing plate used for separating the rice outlet from the air inlet of the shell outlet fan is arranged below the fourth guide plate.

4. A rice huller, characterized in that, the rice huller comprises the winnowing box for agricultural product processing as claimed in any one of claims 1 to 3, the outer end of the feeding pipe of the winnowing box is connected with a centrifugal rice huller through a flexible pipe;

the centrifugal rice huller comprises a radially split shell cover, a tangential outlet is formed in the outer circumference of the shell, the outer end of a feeding pipe is communicated with the tangential outlet through a flexible pipe, a circle of replaceable hulling rubber ring is fully paved and fixed on the inner wall of the outer circumference of the shell, and a breaking notch is formed in the hulling rubber ring corresponding to the tangential outlet so as to facilitate rice discharging; the rice husking device comprises a shell, a rice discharging inner sleeve and a rice discharging inner sleeve, wherein the shell is provided with a coaxial rotating shaft, the rotating shaft is connected with a husking impeller assembly in the shell in a driving mode, the rotating shaft is connected with a feeding device, the rice discharging inner sleeve is fixedly arranged in the shell and sleeved on the outer side of the rotating shaft, and a radial discharging hole is formed in the rice discharging inner sleeve so that rice fed in along the rotating shaft can be discharged in the radial outer direction; the shelling impeller assembly is positioned between the rice discharging inner sleeve and the shelling rubber ring; the shelling impeller assembly comprises two blade mounting plates which are arranged at intervals along the axial direction of a rotating shaft, the two blade mounting plates are parallel and right opposite to each other, the radial discharge port is positioned between the two blade mounting plates, a plurality of blade bodies which are uniformly distributed in the circumferential direction are connected between the two blade mounting plates, each blade body comprises a main body plate which extends along the radial direction, the outer end of each main body plate is connected with a collision plate which extends along the radial direction outwards and towards the downstream side of the rotating direction, and the inner end of each main body plate is connected with a guide plate which extends along the radial direction inwards and towards the downstream side of the rotating direction.

5. A rice milling machine according to claim 4, characterized in that: the intersection position of the upstream side surfaces of the guide plate and the main body plate in the rotating direction is transited through a raised arc section.

6. A rice milling machine according to claim 4, characterized in that: the main body plate extends towards the two sides of the two blade mounting plates respectively to be provided with connecting portions, spoke holes corresponding to the connecting portions are arranged on the blade mounting plates in a penetrating mode, and the connecting portions extend into the corresponding spoke holes.

7. A rice milling machine as defined in claim 6, wherein: the number of the blade bodies is eight, and the length of the guide plate is one third to one half of that of the main body plate.

8. A rice milling machine according to any one of claims 4-7, characterized in that: guide board, main part board and collision board structure as an organic whole.

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