CN112337796A - Three-stage screening device for rice processing and screening method thereof - Google Patents

Abstract

The invention provides a three-level screening device for rice processing and a screening method thereof. The three-stage screening device for rice processing comprises a machine body; the first-level screening chamber is arranged in the machine body. The invention provides a three-level screening device for rice processing and a screening method thereof, wherein the grading screening device can respectively carry out grading screening treatment on different impurities in rice grains through the matching arrangement of a first-level screening structure, a second-level screening structure and the third-level screening structure, wherein the first-level screening structure is used for separating lighter dust or rice husks in the rice grains from the rice, the second-level screening structure is used for mainly screening out larger impurity particles in the rice grains, the third-level screening structure is used for mainly screening and separating broken rice grains and impurity particles smaller than the rice grains, the impurities in the rice grains are screened in three levels, the impurities in the rice grains can be effectively screened out, and the screening effect of the device is greatly improved.

Description

Three-stage screening device for rice processing and screening method thereof

Technical Field

The invention relates to the field of rice processing, in particular to a three-stage screening device for rice processing and a screening method thereof.

Background

The rice is a finished product prepared by rice through the working procedures of cleaning, hulling, milling, finishing the finished product and the like, contains nearly 64 percent of nutrient substances in the rice and more than 90 percent of nutrient elements required by a human body, contains about 75 percent of carbohydrate, 7 to 8 percent of protein and 1.3 to 1.8 percent of fat, the rice contains rich B vitamins, the carbohydrate in the rice is mainly starch, the protein is mainly rice gluten, the rice protein is not a complete protein and has a nutritional value lower than that of animal protein because the biological value and the amino acid composition ratio of the rice protein are higher than that of cereal crops such as wheat, barley, millet, corn and the like, the digestibility is 66.8-83.1 percent, the rice protein is also a higher one of the cereal proteins, and the content of lysine and threonine in the rice protein is less.

In the course of working at the rice, contain some dusts, foreign particles and broken rice grain in the rice after whitening, in order to improve the holistic quality of rice, need use the sieving mechanism to filter the rice, and among the prior art, the sieving mechanism screening mode is more single, can not be fine carry out the classified screening to different materials in the rice for the final screening effect of rice is ideal inadequately.

Therefore, it is necessary to provide a three-stage screening apparatus for rice processing and a screening method thereof to solve the above technical problems.

Disclosure of Invention

The invention provides a three-level screening device for rice processing and a screening method thereof, and solves the problems that the screening mode of the existing rice screening structure is single, different substances in rice cannot be well graded and screened, and the final screening effect of the rice is not ideal.

In order to solve the technical problem, the three-stage screening device for rice processing provided by the invention comprises:

a body;

the screening machine comprises a machine body, a primary screening chamber, a secondary screening structure and a screening device, wherein the primary screening chamber is arranged inside the machine body, the machine body is provided with the primary screening structure, the primary screening structure comprises a rotating motor, a flow guide piece, a collecting bin and a protective cover, two sides of the flow guide piece are respectively and fixedly connected with two sides of the inner wall of the primary screening chamber, one end of an output shaft of the rotating motor is fixedly connected with a rotating fan blade, and a filter screen is fixedly connected onto the flow guide piece;

the screening machine comprises a machine body, a first-stage screening chamber, a second-stage screening chamber, a screening drum, a pulley, a chute, a feeding pipe, a discharging pipe and a feeding pipe, wherein the first-stage screening chamber is arranged in the machine body;

tertiary screening chamber, tertiary screening chamber is seted up in the inside bottom of organism, the inside of tertiary screening chamber is provided with tertiary screening structure, tertiary screening structure is including driving motor and screening fill.

Preferably, one end of the output shaft of the driving motor is fixedly connected with a rotating disc, the bottom of the screening hopper is fixedly connected with a contact plate, and one side of the contact plate is attached to one side of the rotating disc.

Preferably, a screening net is fixedly connected between two sides of the inner wall of the screening hopper, limiting rods are fixedly connected to the left side and the right side of the screening hopper, one end of each limiting rod penetrates through the inside of the machine body and extends to the outside of the machine body, and a supporting spring is sleeved on the outer surface of each limiting rod.

Preferably, the equal fixedly connected with gyro wheel in the left and right sides of screening hopper bottom, the left and right sides of screening hopper all communicates there is row material pipe, the one end of arranging the material pipe runs through the inside of organism and extends to the outside of organism.

Preferably, the bottom fixedly connected with of organism supports the base, the equal fixedly connected with universal wheel in both sides about supporting the base bottom.

Preferably, the top of the machine body is fixedly connected with a rice inlet hopper, and the bottom of the inner wall of the secondary screening chamber is communicated with the top of the inner wall of the tertiary screening chamber.

Preferably, the collection bin is fixedly connected to the left side of the machine body, the rotating motor is arranged on the right side of the machine body, and the protective cover is fixedly connected to the right side of the inner wall of the primary screening chamber.

Preferably, the suction pump is fixedly connected to the left side of the machine body, the top of the fixing piece is fixedly connected to the top of the inner wall of the secondary screening chamber, and the driving motor is arranged on the right side of the machine body.

A screening method of a three-level screening device for rice processing comprises the following steps:

s1, when screening, rice is poured into the rice inlet hopper, so that the rice enters the primary screening chamber, the primary screening treatment is carried out on the rice through the primary screening structure, the rotating motor can drive the rotating fan blades to rotate simultaneously to generate wind power to sweep the interior of the primary screening chamber, and the rice grains entering the primary screening chamber are swept by the wind power, wherein light dust or rice husks are separated from the rice, so that the primary screening treatment is realized;

s2, performing secondary screening treatment, namely operating a suction pump to generate suction force, sucking the rice grains in the guide chute, conveying the rice grains to the inside of a screening rotary drum through the suction pump, rotating the screening rotary drum through a driving motor at the moment, so that the screening rotary drum can rotate simultaneously, the rice grains in the screening rotary drum can fall through meshes on the screening rotary drum, and larger particles in the rice grains are retained in the screening rotary drum, so that the separation of the rice grains from impurity particles is completed;

s3, tertiary screening processing, after the grain of rice is handled through the second grade screening, enter into tertiary screening room, and drop on the screen cloth, rotate through driving the motor, make the rolling disc rotate simultaneously, and then drive the contact plate and be reciprocating motion at the horizontal direction, make the screen cloth be reciprocating motion simultaneously, and the grain of rice that is located the screen cloth is along with the continuous reciprocating motion of screen cloth, go out the broken rice grain in the grain of rice and less granule screening, and then realize the tertiary separation to the grain of rice.

Compared with the related art, the three-stage screening device for rice processing and the screening method thereof provided by the invention have the following beneficial effects:

the invention provides a three-level screening device for rice processing and a screening method thereof, the grading screening device can respectively carry out grading screening treatment aiming at different impurities in rice grains through the matching arrangement of a first-level screening structure, a second-level screening structure and the third-level screening structure, wherein the grading screening device is used for separating lighter dust or rice husks in the rice grains from the rice through the arrangement of the first-level screening structure, mainly screening out larger impurity particles in the rice grains through the arrangement of the second-level screening structure, mainly screening and separating broken rice grains and impurity particles smaller than the rice grains through the third-level screening structure, screening the impurities in the rice grains in three levels, effectively screening the impurities in the rice grains, and compared with the traditional screening device, the screening device has more various screening modes, can ensure that the impurities in the rice grains are screened cleanly, and greatly improves the screening effect of the device, the processing method is simple to operate and convenient to use, and can well meet the processing requirements of people.

Drawings

FIG. 1 is a schematic structural view of the exterior of a three-stage screening device for rice processing according to the present invention;

FIG. 2 is a schematic structural view of the interior of a three-stage screening device for rice processing according to the present invention;

FIG. 3 is a schematic structural diagram of the secondary screening structure shown in FIG. 2;

FIG. 4 is a schematic side view of the screen drum of FIG. 2;

fig. 5 is an enlarged view of the portion a shown in fig. 2.

Reference numbers in the figures: 1. the machine body, 2, a first-level screening chamber, 3, a first-level screening structure, 31, a rotating motor, 32, a flow guide piece, 33, a collection bin, 34, a protective cover, 35, rotating fan blades, 36, a filter screen, 4, a second-level screening chamber, 5, a material guide groove, 6, a second-level screening structure, 61, a driving motor, 62, a suction pump, 63, a fixing piece, 64, a screening rotary drum, 65, a pulley, 66, a sliding groove, 67, a feeding pipe, 68, a discharging pipe, 7, a third-level screening chamber, 8, a third-level screening structure, 81, a driving motor, 82, a screening hopper, 83, a rotary disc, 84, a contact plate, 85, a screening net, 86, a limiting rod, 87, a supporting spring, 88, a roller, 89, a discharging pipe, 9, a supporting base, 10, a universal wheel, 11.

Detailed Description

The invention is further described with reference to the following figures and embodiments.

Please refer to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5 in combination, wherein fig. 1 is a schematic structural diagram of an external portion of a three-stage screening apparatus for rice processing according to the present invention; FIG. 2 is a schematic structural view of the interior of a three-stage screening device for rice processing according to the present invention; FIG. 3 is a schematic structural diagram of the secondary screening structure shown in FIG. 2; FIG. 4 is a schematic side view of the screen drum of FIG. 2; fig. 5 is an enlarged view of the portion a shown in fig. 2. Tertiary sieving mechanism is used in rice processing includes:

a machine body 1;

the screening machine comprises a machine body 1, a primary screening chamber 2, a primary screening structure 3, a screening device and a screening device, wherein the primary screening chamber 2 is arranged inside the machine body 1, the primary screening structure 3 is arranged on the machine body 1, the primary screening structure 3 comprises a rotating motor 31, a flow guide part 32, a collecting bin 33 and a protective cover 34, two sides of the flow guide part 32 are fixedly connected with two sides of the inner wall of the primary screening chamber 2 respectively, one end of an output shaft of the rotating motor 31 is fixedly connected with a rotating fan blade 35, and the flow guide;

a secondary screening chamber 4, the secondary screening chamber 4 is arranged inside the machine body 1, the top of the inner wall of the primary screening chamber 2 is communicated with a material guide groove 5, the machine body 1 is provided with a secondary screening structure 6, the secondary screening structure 6 comprises a driving motor 61, a suction pump 62 and two fixing pieces 63, one end of the output shaft of the driving motor 61 is fixedly connected with a screening drum 64 in the secondary screening chamber 4, the two fixing pieces 63 are respectively sleeved on the left side and the right side of the outer surface of the screening drum 64, pulleys 65 are fixedly connected to both sides of the fixing member 63, sliding grooves 66 are formed in both the left and right sides of the outer surface of the screening drum 64, the inside of the chute 66 is in rolling connection with the outside of the pulley 65, the input end of the suction pump 62 and the inside of the guide chute 5 are communicated with a feeding pipe 67, and the output end of the suction pump 62 is communicated with a discharging pipe 68;

tertiary screening chamber 7, tertiary screening chamber 7 is seted up in the inside bottom of organism 1, the inside of tertiary screening chamber 7 is provided with tertiary screening structure 8, tertiary screening structure 8 is including driving motor 81 and screening fill 82.

The first-level screening chamber 2 is located at the top of the interior of the machine body 1, the rotating motor 31 is externally connected with a power supply and is connected with an external switch, the rotating motor 31 rotates to drive the rotating fan blades 35 to rotate simultaneously, the right side of the flow guide piece 32 is in an inclined state, the interior of the first-level screening chamber 2 is divided into two parts, the right side and the first-level screening chamber 2 form a rice grain flow channel, the left side and the left side of the first-level screening chamber 2 form a dust or rice husk discharge channel, after rice grains enter from the rice inlet hopper 11, the rice grains directly drop on the filter screen 36 and flow on the filter screen 36, and the rice grains are primarily screened;

through setting up this one-level screening structure 3, be used for carrying out the one-level screening to the rice grain, during the use, rotate through rotating motor 31, can drive and rotate flabellum 35 simultaneously, make it produce wind-force and sweep the inside of one-level screening chamber 2, the rice grain that enters into the inside of one-level screening chamber 2 at this moment receives wind-force to sweep, wherein lighter dust or rice husk separate from the rice, then blow to discharge in the passageway on the left of water conservancy diversion piece 32, finally get into collection storehouse 33, the rice grain can directly drop to the slope filter screen 36 on the right side of water conservancy diversion piece 32, and flow downwards, the dust that has not been swept above it can separate with the rice grain through filter screen 36 in the flowing process, further separate the dust, ensure that the dust separation is more thorough, carry out effectual one-level screening to the rice grain;

the second-stage screening chamber 4 is positioned under the first-stage screening chamber 2, the rice flows into the guide chute 5 after being screened by the first-stage screening, the driving motor 61 and the suction pump 62 are externally connected with a power supply and are connected with an external switch, the suction pump 62 is arranged on the left side of the machine body 1, the rice grains in the guide chute 5 can be conveyed into the screening rotary drum 64 by starting the suction pump 62, the fixing part 63 is used for fixing the screening rotary drum 64, the outer surface of the screening rotary drum 64 is in a metal net shape, the pore size of the screening rotary drum is set according to the size of the rice grains, the normal passing of the rice grains through the meshes is ensured, the surface of the screening rotary drum 64 is provided with a sealing cover, when the internal impurity grains need to be taken out, the sealing cover can be opened and then taken out, the impurity grains are taken out, the pulley 65 is matched with the sliding chute 66 to roll, the screening rotary drum 64 is smoother when, one end of the discharge pipe 68 extends through the left side of the machine body 1 to the inside of the screening drum 64;

through the arrangement of the second-stage screening structure 6, the large impurity particles in the rice grains are mainly screened out, in use, the suction pump 62 is operated to enable the feeding pipe 67 to generate suction force, the rice grains in the guide chute 5 can be sucked in, then the rice grains are conveyed to the discharging pipe 68 through the suction pump 62 and finally enter the screening rotary drum 64, at the moment, the driving motor 61 is rotated to enable the screening rotary drum 64 to rotate simultaneously, the screening rotary drum 64 rotates to enable the rice grains in the interior to fall through meshes on the screening rotary drum 64, the large particles in the rice grains are retained in the screening rotary drum 64, the separation of the rice grains and the impurity particles is further completed, the second-stage screening of the rice grains is realized, the rice grains are further screened, and the rice grains are enabled to be purer;

tertiary screening chamber 7 is located second grade screening chamber 4 under to communicate with the bottom of 4 inner walls of second grade screening chamber, the grain of rice after the second grade screening can drop to tertiary screening chamber in, carry out the screening of next step.

One end of the output shaft of the driving motor 81 is fixedly connected with a rotating disc 83, the bottom of the screening hopper 82 is fixedly connected with a contact plate 84, and one side of the contact plate 84 is attached to one side of the rotating disc 83.

The driving motor 81 is arranged at the bottom of the inner wall of the three-stage screening chamber 7, is externally connected with a power supply and is connected with an external switch, the rotating disc 83 is in an oval shape, the rotating disc 83 can be driven to rotate simultaneously by driving the motor 81 to rotate, and the rotating disc 83 rotates to enable the contact plate 84 to move in the horizontal direction.

A screening net 85 is fixedly connected between two sides of the inner wall of the screening hopper 82, limiting rods 86 are fixedly connected to the left side and the right side of the screening hopper 82, one end of each limiting rod 86 penetrates through the inside of the machine body 1 and extends to the outside of the machine body 1, and a supporting spring 87 is sleeved on the outer surface of each limiting rod 86.

The grain of rice gets into tertiary screening room 7 inside after, directly drop to on the screen cloth 85, fight 82 at horizontal direction reciprocating motion through the screening, make screen cloth 85 can filter the grain of rice on it, sieve out the broken rice grain of rice in the grain of rice, separate with complete grain of rice, gag lever post 86 and the inside sliding connection of organism 1, play limiting displacement to screening fill 82, make screening fill 82 can be at the inside stable removal of tertiary screening room 7, supporting spring 87 provides elasticity support for screening fill 82.

The equal fixedly connected with gyro wheel 88 in the left and right sides of screening hopper 82 bottom, the left and right sides of screening hopper 82 all communicates and has arranged material pipe 89, arrange the one end of material pipe 89 and run through the inside of organism 1 and extend to the outside of organism 1.

The outer surface of the roller 88 is in rolling connection with the bottom of the inner wall of the third-stage screening chamber 7, so that the screening hopper 82 is smoother in movement and smaller in friction force, the left discharging pipe 89 is used for discharging qualified rice grains, the right discharging pipe 89 is used for discharging screened broken rice grains, and the discharging pipe 89 is provided with a control valve for controlling the flow of the discharging pipe 89;

through setting up this tertiary screening structure 8, mainly screen the separation to the broken rice grain in the rice grain and the foreign particle that is less than the rice grain, in use, rotate through driving motor 81, make the rolling disc 83 can rotate simultaneously, rotate through rolling disc 83, can drive contact plate 84 and be reciprocating motion at the horizontal direction, make screening net 85 be reciprocating motion simultaneously, and the rice grain that is located on screening net 85 is along with the continuous reciprocating motion of screening net 85, the broken rice grain and the less granule screening in the rice grain are gone out, and then realize the tertiary separation to the rice grain, when screening fill 82 is reciprocating motion, be located complete rice grain and screening broken rice grain and the less impurity of fighting 82 inner wall bottom on screening net 85, enter into respectively and arrange in the material pipe 89, constantly discharge.

The bottom fixedly connected with of organism 1 supports base 9, the equal fixedly connected with universal wheel 10 in both sides about supporting base 9 bottom.

The supporting base 9 provides a supporting function for the machine body 1, and the universal wheels 10 enable the device to be more convenient to move.

The top of the machine body 1 is fixedly connected with a rice inlet hopper 11, and the bottom of the inner wall of the secondary screening chamber 4 is communicated with the top of the inner wall of the tertiary screening chamber 7.

The bottom of the rice inlet hopper 11 extends into the primary screening chamber 2, and when rice is screened, the rice is guided into the rice inlet hopper 11, so that the rice enters the primary screening chamber 2.

Collect storehouse 33 fixed connection in the left side of organism 1, rotating electrical machines 31 sets up the right side of organism 1, protection casing 34 fixed connection in the right side of one-level screening room 2 inner wall.

The collection bin 33 is provided with a bin gate, and the bin gate can be opened to discharge the internal dust after the internal control is filled.

The suction pump 62 is fixedly connected to the left side of the machine body 1, the top of the fixing piece 63 is fixedly connected to the top of the inner wall of the secondary screening chamber 4, and the driving motor 61 is arranged on the right side of the machine body 1.

A screening method of a three-level screening device for rice processing comprises the following steps:

s1, during screening, rice is poured into the rice inlet hopper 11, so that the rice enters the primary screening chamber 2, the primary screening treatment is carried out on the rice through the primary screening structure 3, the rotating motor 31 rotates to drive the rotating fan blades 35 to rotate simultaneously, so that wind power is generated to sweep the interior of the primary screening chamber 2, the rice grains entering the interior of the primary screening chamber 2 are swept by the wind power, and light dust or rice husks are separated from the rice, so that the primary screening treatment is realized;

s2, performing secondary screening treatment, namely operating the suction pump 62 to generate suction force, sucking rice grains in the guide chute 5, conveying the rice grains to the inside of the screening rotary drum 64 through the suction pump 62, rotating the screening rotary drum 64 through the driving motor 61 at the moment, so that the screening rotary drum 64 can rotate simultaneously, the rice grains in the screening rotary drum 64 can fall through meshes on the screening rotary drum 64, and larger particles in the rice grains are retained in the screening rotary drum 64, so that the separation of the rice grains from impurity particles is completed;

s3, tertiary screening treatment, after the rice grains are subjected to secondary screening treatment, the rice grains enter the tertiary screening chamber 7 and fall on the screening net 85, the rotating disc 83 can rotate simultaneously by driving the motor 81 to further drive the contact plate 84 to do reciprocating motion in the horizontal direction, the screening net 85 makes reciprocating motion simultaneously, the rice grains on the screening net 85 are subjected to continuous reciprocating motion along with the screening net 85, broken rice grains and smaller grains in the rice grains are screened out, and then tertiary separation of the rice grains is realized.

The working principle of the three-level screening device for rice processing and the screening method thereof provided by the invention is as follows:

during screening, rice is poured into the rice inlet hopper 11, so that the rice enters the primary screening chamber 2, primary screening treatment is carried out on the rice through the primary screening structure 3, the rice is rotated through the rotating motor 31, can drive the rotating fan blades 35 to rotate simultaneously, so that wind power is generated to sweep the interior of the primary screening chamber 2, the rice grains entering the interior of the primary screening chamber 2 are swept by the wind power, wherein the lighter dust or husk is separated from the rice and blown to the channel on the left side of the deflector 32, where it is discharged, and finally into the collection bin 33, the rice grains directly fall onto the inclined filter screen 36 on the right side of the flow guide piece 32 and flow downwards, in the flowing process, dust which is not blown out can be separated from the rice grains through the filter screen 36, so that the dust is further separated, the dust is ensured to be more thoroughly separated, and effective primary screening treatment is carried out on the rice grains;

then, the suction pump 62 is operated to enable the feeding pipe 67 to generate suction force, rice grains in the guide chute 5 can be sucked in, then the rice grains are conveyed to the discharging pipe 68 through the suction pump 62 and finally enter the screening rotary drum 64, at the moment, the driving motor 61 rotates to enable the screening rotary drum 64 to rotate simultaneously, and the screening rotary drum 64 rotates to enable the rice grains in the screening rotary drum 64 to fall through meshes on the screening rotary drum 64, and larger particles in the rice grains are retained in the screening rotary drum 64, so that the separation of the rice grains from impurity particles is completed;

accomplish the rice grain after the second grade screening, enter into tertiary screening chamber 7, and drop on screening net 85, rotate through driving motor 81, make rolling disc 83 rotate simultaneously, rotate through rolling disc 83, can drive contact plate 84 and do reciprocating motion at the horizontal direction, make screening net 85 do reciprocating motion simultaneously, and the rice grain that lies in on screening net 85 is along with the continuous reciprocating motion of screening net 85, sift out the broken rice grain in the rice grain and less granule, and then realize the tertiary separation to the rice grain, when screening fill 82 is reciprocating motion, the broken rice grain and the less impurity that lie in complete rice grain and screening fill 82 inner wall bottom on screening net 85, enter into respectively and arrange the material pipe 89, discharge constantly.

Compared with the related art, the three-stage screening device for rice processing and the screening method thereof provided by the invention have the following beneficial effects:

the grading and screening device can respectively carry out grading and screening treatment on different impurities in rice grains through the matching arrangement of the primary screening structure 3, the secondary screening structure 6 and the tertiary screening structure 8, wherein, the first-level screening structure 3 is used for separating light dust or rice husk in rice grains from rice, the secondary screening structure mainly screens out larger impurity particles in the rice grains, the tertiary screening structure mainly screens and separates broken rice grains and impurity particles smaller than the rice grains, the impurities in the rice grains are screened in three stages, the impurities in the rice grains can be effectively screened out, and compared with the traditional screening device, its screening mode is more various, can ensure the impurity screening clean in the grain of rice for the screening effect of device promotes greatly, and easy operation, convenient to use, satisfying people's that can be fine processing demand.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. The utility model provides a three-level sieving mechanism is used in rice processing which characterized in that includes:

a body;

the screening machine comprises a machine body, a primary screening chamber, a secondary screening structure and a screening device, wherein the primary screening chamber is arranged inside the machine body, the machine body is provided with the primary screening structure, the primary screening structure comprises a rotating motor, a flow guide piece, a collecting bin and a protective cover, two sides of the flow guide piece are respectively and fixedly connected with two sides of the inner wall of the primary screening chamber, one end of an output shaft of the rotating motor is fixedly connected with a rotating fan blade, and a filter screen is fixedly connected onto the flow guide piece;

the screening machine comprises a machine body, a first-stage screening chamber, a second-stage screening chamber, a screening drum, a pulley, a chute, a feeding pipe, a discharging pipe and a feeding pipe, wherein the first-stage screening chamber is arranged in the machine body;

tertiary screening chamber, tertiary screening chamber is seted up in the inside bottom of organism, the inside of tertiary screening chamber is provided with tertiary screening structure, tertiary screening structure is including driving motor and screening fill.

2. The three-stage screening device for rice processing as claimed in claim 1, wherein a rotating disc is fixedly connected to one end of the output shaft of the driving motor, a contact plate is fixedly connected to the bottom of the screening hopper, and one side of the contact plate is attached to one side of the rotating disc.

3. The three-stage screening device for rice processing according to claim 1, wherein a screening net is fixedly connected between two sides of the inner wall of the screening hopper, limiting rods are fixedly connected to the left and right sides of the screening hopper, one end of each limiting rod penetrates through the inside of the machine body and extends to the outside of the machine body, and a support spring is sleeved on the outer surface of each limiting rod.

4. The three-stage screening device for rice processing as claimed in claim 1, wherein rollers are fixedly connected to both left and right sides of the bottom of the screening hopper, a discharging pipe is communicated to both left and right sides of the screening hopper, and one end of the discharging pipe penetrates through the interior of the machine body and extends to the exterior of the machine body.

5. The three-stage screening device for rice processing according to claim 1, wherein a supporting base is fixedly connected to the bottom of the machine body, and universal wheels are fixedly connected to the left side and the right side of the bottom of the supporting base.

6. The three-stage screening device for rice processing according to claim 1, wherein a rice inlet hopper is fixedly connected to the top of the machine body, and the bottom of the inner wall of the secondary screening chamber is communicated with the top of the inner wall of the three-stage screening chamber.

7. The three-stage screening device for rice processing according to claim 1, wherein the collection bin is fixedly connected to the left side of the machine body, the rotating motor is arranged on the right side of the machine body, and the protection cover is fixedly connected to the right side of the inner wall of the first-stage screening chamber.

8. The tertiary screening device for rice processing as claimed in claim 1, wherein the suction pump is fixedly connected to the left side of the machine body, the top of the fixing member is fixedly connected to the top of the inner wall of the secondary screening chamber, and the driving motor is disposed at the right side of the machine body.

9. A screening method of a three-level screening device for rice processing is characterized by comprising the following steps:

s1, when screening, rice is poured into the rice inlet hopper, so that the rice enters the primary screening chamber, the primary screening treatment is carried out on the rice through the primary screening structure, the rotating motor can drive the rotating fan blades to rotate simultaneously to generate wind power to sweep the interior of the primary screening chamber, and the rice grains entering the primary screening chamber are swept by the wind power, wherein light dust or rice husks are separated from the rice, so that the primary screening treatment is realized;

s2, performing secondary screening treatment, namely operating a suction pump to generate suction force, sucking the rice grains in the guide chute, conveying the rice grains to the inside of a screening rotary drum through the suction pump, rotating the screening rotary drum through a driving motor at the moment, so that the screening rotary drum can rotate simultaneously, the rice grains in the screening rotary drum can fall through meshes on the screening rotary drum, and larger particles in the rice grains are retained in the screening rotary drum, so that the separation of the rice grains from impurity particles is completed;

s3, tertiary screening processing, after the grain of rice is handled through the second grade screening, enter into tertiary screening room, and drop on the screen cloth, rotate through driving the motor, make the rolling disc rotate simultaneously, and then drive the contact plate and be reciprocating motion at the horizontal direction, make the screen cloth be reciprocating motion simultaneously, and the grain of rice that is located the screen cloth is along with the continuous reciprocating motion of screen cloth, go out the broken rice grain in the grain of rice and less granule screening, and then realize the tertiary separation to the grain of rice.

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