CN113894036B

CN113894036B - Cereal screening plant

Info

Publication number: CN113894036B
Application number: CN202111228830.6A
Authority: CN
Inventors: 张燕; 龙勇; 方丽; 孙秋雨; 宁彤
Original assignee: Hainan University
Current assignee: Hainan University
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2023-02-07
Anticipated expiration: 2041-10-21
Also published as: CN113894036A

Abstract

The invention discloses a grain screening device which comprises a support, a blanking hopper, a screening basin, a reciprocating mechanism and a blanking mechanism, wherein the blanking hopper is arranged on the support; the sieve basin is movably arranged in the port of the blanking hopper; a support frame is arranged on one side of the support, and two ends of the reciprocating mechanism are rotatably connected to the support frame and the blanking hopper, so that the screening basin can reciprocate in the blanking hopper to screen grains; the bracket is provided with a driving part for driving the reciprocating mechanism to move; the blanking mechanism is arranged on the bracket, and one end of the blanking mechanism is abutted against the end part of the reciprocating mechanism; the reciprocating mechanism and the blanking mechanism are arranged on the bracket; reciprocating mechanism's motion in-process promotes unloading mechanism and carries out intermittent type unloading to cereal to control unloading speed and unloading volume according to reciprocating mechanism's speed, effective degree of automation who improves the device need not the manual work and adds cereal, effective lower hand labor power improves cereal screening efficiency.

Description

Cereal screening plant

Technical Field

The invention relates to the technical field of agricultural processing equipment, in particular to a grain screening device.

Background

The scope of the 'grain' is wide, and the 'grain' comprises rice, wheat, millet, soybean and other coarse cereals. The cereals include rice, wheat, millet, soybean, etc. Cereals are one of indispensable foods on dining tables of common people for thousands of years as traditional diets of Chinese people, play an important role in diet of China and are taken as traditional staple food. Cereals contain between 8 and 12% protein, less fat, about 2%, and the cereals contain not only large amounts of carbohydrate (about 70-80%), but also mostly starch. Cereals are an important source of B vitamins, among which vitamin B1, B2 and nicotinic acid are abundant. Millet and corn contain carotene. Cereal germs contain relatively large amounts of vitamin E, and most of the vitamin E is concentrated in germs, aleurone layer and rice husk. After the grains are harvested, the grains need to be sent into a screening device, and in the screening process, the grain particles are screened in size to select high-quality large-grain grains for use as seeds, and meanwhile, small-grain grains are collected for other uses; because the screen cloth needs to be fed in the cereal screening process to whether the cereal state in the observation screen cloth is too much or too little, generally need artifical the feeding and observe, adopt the feeding effect of this kind of mode poor, and need observe the screen cloth condition in real time and feed in raw material.

The patent number is CN 201910920384.1's a cereal separation sieving mechanism for supermarket, including the screen cloth, the both sides of screen cloth are provided with tensile pole No. one and tensile pole No. two, tensile pole No. one and tensile pole No. two bolt fastening are on the both sides inner wall of main tank, the lower extreme swing joint of screen cloth has four groups of vibrations bases, main tank inner wall one side fixed mounting has the discharge door, the discharge door is located the lower extreme of screen cloth, the lower extreme of discharge door is provided with the hang plate, set up a plurality of groups of evenly distributed's screening opening on the hang plate, fixed mounting has five groups of spacing limits on the hang plate, one side of hang plate is provided with four groups of toppling plates, toppling plate and spacing limit can topple over cereal orderly and effectively; adopt above-mentioned technical scheme, can not realize interrupting the unloading to cereal, when the screen cloth piles up debris many, the problem that cereal piles up in the screen cloth easily appears.

Disclosure of Invention

The invention provides a grain screening device, and aims to solve the problem that the grain screening device cannot perform discontinuous feeding to control feeding speed.

In order to achieve the purpose, the invention provides a grain screening device which comprises a support, a discharging hopper, a screening basin, a reciprocating mechanism and a discharging mechanism, wherein the discharging hopper is arranged on the support; the sieve basin is movably arranged in the port of the blanking hopper; a support frame is arranged on one side of the support, and two ends of the reciprocating mechanism are rotatably connected to the support frame and the discharging hopper, so that the screening basin can reciprocate in the discharging hopper to screen grains; the bracket is provided with a driving part for driving the reciprocating mechanism to move; the blanking mechanism is arranged on the support, and one end of the blanking mechanism is abutted against the end part of the reciprocating mechanism, so that the reciprocating mechanism controls the blanking speed of the other end of the blanking mechanism.

Furthermore, the reciprocating mechanism comprises a limiting pipe, a sliding rod and a turntable provided with an oval track, and the limiting pipe is rotatably arranged between the blanking hoppers; the sliding rod is arranged in the limiting pipe in a sliding mode, and the rotary disc is connected to the output end of the driving part; the limiting pipe is provided with a strip-shaped through hole, the end part of the sliding rod is provided with a guide rod, and the guide rod penetrates through the strip-shaped through hole to enable the end part of the guide rod to be located in the oval track.

Furthermore, the blanking mechanism comprises a blanking inclined pipe, a horizontal discharging pipe and a U-shaped rod, a cover body is arranged on the support, the horizontal discharging pipe is arranged on the cover body, the blanking inclined pipe is connected to the horizontal discharging pipe, one end of the U-shaped rod is abutted against the sliding rod, and the other end of the U-shaped rod is slidably positioned in the horizontal discharging pipe; the U-shaped rod is connected with one surface of the cover body through a plurality of springs.

Furthermore, a turnover mechanism and an impurity removing mechanism are arranged on the bracket, and the output end of the driving part is in transmission connection with the turnover mechanism through a switching assembly; the impurity discharging mechanism is connected with the turnover mechanism, so that in the process that the turnover mechanism drives the sieve basin to turn, the impurity discharging mechanism is pulled to rotate to enter the discharging hopper to collect the screened impurities.

Further, the turnover mechanism comprises a bevel gear disc, a rectangular rod and a transmission bevel gear, wherein the bevel gear disc is arranged on the limiting pipe; the driving part is a driving motor, the rectangular rod is connected to the output end of the driving motor, the turntable is fixedly connected to the end part of the rectangular rod, and the transmission bevel gear is connected to the rectangular rod in a sliding manner; the switching component is in rolling connection with the transmission bevel gear, so that the switching component pushes the transmission bevel gear to be meshed with the bevel gear disc through telescopic motion.

Furthermore, the switching component comprises a magnetic suction component and a push rod, the magnetic suction component is arranged below the bracket, the end part of the push rod is rotatably provided with a roller, the lower end surface of the transmission bevel gear is provided with an annular limiting groove, and the roller is limited in the annular limiting groove; the other end of the push rod penetrates through the support and is connected with the magnetic suction component.

Furthermore, the impurity removing mechanism comprises a telescopic Liang pull rod, a rotating beam and a collecting frame, and the pull rod is arranged on the support in a sliding mode; one end of the telescopic beam is hinged to the conical fluted disc, and the other end of the telescopic beam is fixedly connected with the end part of the pull rod; the rotating beam is rotatably arranged on the bracket through a rotating shaft, and the collecting frame is connected to the end part of the rotating beam; the ends of the rotating beams are connected through a linkage gear; the rotating shaft is provided with rotating teeth, the pull rod is provided with a plurality of teeth, and the teeth and the rotating teeth are meshed for transmission through linear motion of the pull rod; a material box is detachably placed in the collecting frame; the discharging hopper is provided with an arc-shaped opening, and the rotating beam is pulled by the pull rod to rotate so as to drive the collecting frame to rotate and enter the discharging hopper through the arc-shaped opening.

Furthermore, the upper end of the transmission bevel gear is provided with a mandril, an annular push sheet is arranged in the oval track, and the mandril penetrates through the turntable to be connected with the annular push sheet; a first spring is arranged at the end part of the guide rod, so that the guide rod can be telescopically arranged at the end part of the sliding rod; an arc-shaped guide part is arranged on one side of the outer ring of the limiting pipe, and one end of the arc-shaped guide part is connected with the discharging hopper; the guide rod is in butt joint with the arc-shaped guide piece through contraction and rotation.

Furthermore, the sieve basin comprises a first sieve basin provided with sieve pores and a second sieve basin for limiting the first sieve basin, one side of the second sieve basin is fixedly connected with the slide rod, and the other side of the second sieve basin is in sliding connection with one side of the blanking hopper through a first limiting rod; the first sieve basin is provided with an arc-shaped rack, the second sieve basin is provided with an arc-shaped limiting through hole, the arc-shaped rack is located in the arc-shaped limiting through hole, the end part of the discharging hopper is provided with a linear rack, and the arc-shaped rack is meshed with the linear rack for transmission.

Furthermore, an arc-shaped partition plate is slidably arranged on the arc-shaped limiting through hole, a wedge-shaped block is slidably arranged on the bracket, and the wedge-shaped block is connected with the arc-shaped partition plate; a second limiting rod is fixedly arranged below the bracket, the wedge block is sleeved on the second limiting rod in a sliding mode, a second spring is sleeved on the second limiting rod in a sleeved mode, and the end portion of the wedge block is abutted to the second spring; the collecting frame pushes the wedge-shaped block to descend through rotation so as to drive the arc-shaped baffle plate to descend to open the arc-shaped limiting through hole.

Compared with the prior art, the method has the following beneficial effects:

the invention discloses a grain screening device.A reciprocating mechanism and a blanking mechanism are arranged on a bracket, so that a driving part controls the reciprocating mechanism to drive a screening basin to carry out reciprocating motion for screening grains; reciprocating mechanism's motion in-process promotes unloading mechanism and carries out intermittent type unloading to cereal to control unloading speed and unloading volume according to reciprocating mechanism's speed, effective degree of automation who improves the device need not the manual work and adds cereal, effective lower hand labor power improves cereal screening efficiency.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

FIG. 1 is a schematic view of a grain screening device of the present application;

FIG. 2 is a schematic view of a discharge mechanism of a grain screening device according to the present application;

FIG. 3 is an axial view of a grain screening device of the present application;

FIG. 4 is an enlarged partial schematic view A of a grain screening device of the present application;

FIG. 5 is an enlarged partial schematic view of a grain screening device B of the present application;

FIG. 6 is an enlarged partial schematic view of a portion C of a grain screening device of the present application;

FIG. 7 is an axial view of a grain screening device of the present application;

FIG. 8 is an enlarged partial schematic view of a grain screening device D of the present application;

FIG. 9 is an axial view of a grain screening device of the present application;

FIG. 10 is a schematic view of a sifter basin of a grain sifting apparatus of the present application;

FIG. 11 is a schematic view of a top bar and annular push plate of a grain screening device of the present application;

figure 12 is a schematic view of a spacing tube and slide bar of a grain screening device of the present application.

Reference numerals: 1-a support; 2-feeding a hopper; 3, screening the basin; 4-a drive member; 5-a first sieve basin; 6-a second sieve basin; 7-arc rack; 8-linear rack; 9-a cover body; 10-an arc guide; 11-a support frame; 20-arc opening; 21-a limiting pipe; 22-a slide bar; 23-a turntable; 24-elliptical orbit; 25-strip-shaped through holes; 26-a guide rod; 27-a first spring; 31-a conical fluted disc; 32-rectangular rods; 33-drive bevel gear; 34-a mandril; 35-annular push sheet; 41-magnetic attraction component; 42-a push rod; 43-a roller; 44-an annular limiting groove; 51-a telescoping beam; 52-a pull rod; 53-a turning beam; 54-a collection frame; 55-rotating teeth; 56-a cartridge; 61-arc spacing through hole; 71-arc baffle; 72-a wedge block; 73-a second stop bar; 74-a second spring; 81-a first L-shaped bar; 82-a second L-shaped bar; 83-a spacing pin; 84-a limiting hole; 91-blanking inclined tube; 92-a horizontal discharge pipe; 93-U-shaped rod; 411-iron rod; 412-a permanent magnet; 413-a third stop lever; 414-third spring; 415-conductive lines.

Detailed Description

For a better understanding of the present invention, its structure, and the functional features and advantages attained by its structure, reference is made to the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, in which:

example 1:

as shown in fig. 1 to 12, the present invention provides a grain screening device, which comprises a support 1, a discharging hopper 2, a screen basin 3, a reciprocating mechanism and a discharging mechanism; the discharging hopper 2 is arranged on the bracket 1; the sieve basin 3 is movably arranged in the port of the blanking hopper 2; a support frame 11 is arranged on one side of the support, and two ends of the reciprocating mechanism are rotatably connected to the support frame 11 and the lower hopper 2, so that the sieve basin 3 can reciprocate in the lower hopper 2 to sieve grains; the bracket 1 is provided with a driving part 4 for driving the reciprocating mechanism to move, so that the driving part 4 drives the reciprocating mechanism to move to drive the screening to carry out reciprocating motion for screening grains; on unloading mechanism located support 1, one end butt in reciprocating mechanism tip of unloading mechanism to make reciprocating mechanism control the unloading speed of unloading mechanism other end, with the unloading speed of controlling unloading mechanism through reciprocating mechanism's reciprocating speed, with the screening speed of cooperation sieve basin 3, thereby reduce the interior cereal of sieve basin 3 and pile up or the few problem of material appears.

Specifically, the reciprocating mechanism comprises a limiting pipe 21, a sliding rod 22 and a turntable 23 provided with an oval track 24, and the limiting pipe 21 is rotatably arranged between one ends of the two blanking hoppers 2 through bearings; the sliding rod 22 is slidably arranged in the limiting pipe 21, and the rotary table 23 is connected to the output end of the driving part 4, so that the driving part 4 can drive the rotary table 23 to rotate in the process of driving to rotate, the oval track 24 is driven to rotate together, the guide rod 26 is driven to perform linear reciprocating motion, and the sieve basin 3 is driven to perform reciprocating motion; the limiting pipe 21 is provided with a strip-shaped through hole 25, the end part of the sliding rod 22 is provided with a guide rod 26, the guide rod 26 penetrates through the strip-shaped through hole 25 to enable the end part to be located in the oval track 24, the driving part 4 drives the rotary disc 23 to rotate to enable the oval track 24 to rotate, the guide rod 26 is driven to conduct linear reciprocating motion, and the sieve basins 3 in the feeding hoppers 2 on the two sides of the support 1 conduct reciprocating motion to sieve grains.

Specifically, the blanking mechanism comprises a blanking inclined tube 91, a horizontal discharging tube 92 and a U-shaped rod 93, a cover body 9 is arranged on the support 1, circular through holes are formed in two sides of the cover body 9, and the circular through holes are sleeved on the outer ring of the blanking hopper 2 so as to couple the reciprocating mechanism through the cover body 9; the horizontal discharge pipe 92 is arranged on the cover body 9, one end of the horizontal discharge pipe 92 is a vertical bent pipe so as to prevent the U-shaped rod 93 from pushing grains out of the opening of the blanking hopper 2 along the horizontal direction under the pushing of the reciprocating mechanism; the blanking inclined pipe 91 is connected to the horizontal discharging pipe 92, so that the blanking speed is increased through the inclined blanking inclined pipe 91, and the blockage problem in the blanking process is effectively reduced; one end of the U-shaped rod 93 is abutted against the sliding rod 22, and the other end of the U-shaped rod 93 is slidably positioned in the horizontal discharge pipe 92 so as to rapidly push out grains in the horizontal discharge pipe 92 through sliding; the U-shaped rod 93 is connected with one surface of the cover body 9 through a plurality of springs, so that the U-shaped rod 93 can be telescopically arranged in the horizontal discharge pipe 92, intermittent discharging of the discharging inclined pipe 91 is realized in a mode of communicating the discharging inclined pipe 91 with the horizontal discharge pipe 92 through intermittent separation, and grains in the horizontal discharge pipe 92 are pushed to enter the vertical bent pipe to be discharged quickly in a telescopic mode.

Example 2:

as shown in fig. 1 to 5, in combination with the technical solution of embodiment 1, in this embodiment, a turnover mechanism and a trash removal mechanism are further disposed on the support 1, and an output end of the driving component 4 is in transmission connection with the turnover mechanism through a switching component, so that the switching component controls connection and disconnection of the driving component 4 and the turnover mechanism; arrange miscellaneous mechanism and tilting mechanism and be connected to make tilting mechanism drive the in-process that sieve basin 3 overturned, the miscellaneous mechanism is arranged in the pulling rotates and gets into hopper 2 down and collect the debris after the screening, and relies on the tilting mechanism return to pull out the miscellaneous mechanism of arranging after collecting the debris from hopper 2 down.

Example 3:

as shown in fig. 1 to 5, in combination with the technical solution of embodiment 2, in this embodiment, the turnover mechanism includes a bevel gear plate 31, a rectangular rod 32, and a transmission bevel gear 33, where the bevel gear plate 31 is disposed on the limiting pipe 21; the driving part 4 is a driving motor, the rectangular rod 32 is connected to the output end of the driving motor, the turntable 23 is fixedly connected to the end part of the rectangular rod 32, and the transmission bevel gear 33 is connected to the rectangular rod 32 in a sliding manner; switching subassembly and transmission bevel gear 33 roll connection, so that the switching subassembly promotes transmission bevel gear 33 and the meshing of awl fluted disc 31 through concertina movement, thereby make drive unit 4 drive awl fluted disc 31 rotate 180 degrees angles, awl fluted disc 31 pivoted in-process drives spacing pipe 21 and rotates, drive slide bar 22 rotation simultaneously of spacing pipe 21 pivoted, slide bar 22 rotates and makes sieve basin 3 also follow to rotate together, thereby realize that awl fluted disc 31 drives the 180 degrees angles of upset of sieve basin 3 come to empty out with the impurity in the sieve basin 3.

Specifically, the impurity removing mechanism comprises a telescopic beam 51, a pull rod 52, a rotating beam 53 and a collecting frame 54, wherein the pull rod 52 is arranged on the bracket 1 in a sliding manner; one end of the telescopic beam 51 is hinged on the bevel gear disc 31, and the other end of the telescopic beam 51 is fixedly connected with the end part of the pull rod 52; the telescopic beam 51 comprises a first telescopic beam 51 and a second telescopic beam 51, one end of the first telescopic beam 51 is hinged on the bevel gear disc 31, and the second telescopic beam 51 is sleeved at the other end of the first telescopic beam 51; the rotating beam 53 is rotatably arranged on the bracket 1 through a rotating shaft, and the collecting frame 54 is connected to the end part of the rotating beam 53; the ends of the rotating beams 53 are connected through a linkage gear 55; the rotating teeth 56 are arranged on the rotating shaft, the pull rod 52 is provided with a plurality of teeth, and the teeth and the rotating teeth 56 are meshed and driven by the pull rod 52 through linear motion; the pull rod 52 is limited on the bracket 1 through a limiting piece, so that the pull rod 52 linearly moves on the bracket 1; the material box 57 is detachably placed in the collecting frame 54, so that the material box 57 is quickly detached to take off impurities in the material box 57 by placing the material box 57 in the collecting frame 54; the lower hopper 2 is provided with an arc-shaped opening 20, the rotating beam 53 is pulled by the pull rod 52 to rotate so as to drive the collecting frame 54 to rotate and enter the lower hopper 2 through the arc-shaped opening 20, so that the overturned sieve basin 3 can dump impurities into a material box 57 in the collecting frame 54; further, a support table for supporting the collection frame 54 is provided on the stand 1.

Example 4:

as shown in fig. 9, with reference to the technical solution of embodiment 3, in this embodiment, the switching component includes a magnetic attraction component 41 and a push rod 42, the magnetic attraction component 41 is disposed below the bracket 1, an idler wheel 43 is rotatably disposed at an end of the push rod 42, an annular limiting groove 44 is disposed on a lower end surface of the transmission bevel gear 33, and the idler wheel 43 is limited in the annular limiting groove 44; the other end of the push rod 42 passes through the bracket 1 and is connected with the magnetic attraction component 41, so that the magnetic attraction component 41 controls the telescopic motion of the push rod 42 to realize the connection and disconnection of the transmission bevel gear 33 and the bevel gear disc 31, thereby controlling the overturning motion of the overturning mechanism.

Specifically, the magnetic attraction assembly 41 includes an iron rod 411, a permanent magnet 412, a third limiting rod 413 and a third spring 414, the iron rod 411 and the third limiting rod 413 are connected with a lead 415 in a winding manner, the iron rod 411 and the third limiting rod 413 are arranged at the bottom of the bracket 1, and the permanent magnet 412 is slidably sleeved on the third limiting rod 413, so that the permanent magnet 412 is vertically arranged above the iron rod 411; the third spring 414 is sleeved on the third limiting rod 413; the end of the push rod 42 is connected with the permanent magnet 412; by arranging the magnetic attraction assembly 41, when the conducting wire 415 is powered on, the iron rod 411 generates a repulsive force to the permanent magnet 412, so that the third spring 414 is compressed to push the push rod 42 to move upwards, and the roller 43 connected to the end of the push rod 42 pushes the transmission bevel gear 33 to move upwards to be meshed with the bevel gear disc 31, so as to drive the bevel gear disc 31 to rotate to drive the sieve basin 3 to turn over.

Example 5:

as shown in fig. 12, with reference to the technical solution of embodiment 4, in this embodiment, the sieve basin 3 includes a first sieve basin 5 provided with sieve pores and a second sieve basin 6 for limiting the first sieve basin 5, the bottom of the first sieve basin 5 is a flat bottom structure, and the lower end of the second sieve basin 6 is provided with an opening, so that grains can fall through the sieve pores at the bottom of the first sieve basin 5; one side of the second sieve basin 6 is fixedly connected with the slide bar 22, and the other side of the second sieve basin 6 is connected with one side of the blanking hopper 2 in a sliding manner through the first limiting rod, so that the second sieve basin 6 is limited on the blanking hopper 2 and can horizontally slide on the blanking hopper 2; an arc-shaped rack 7 is arranged on the first sieve basin 5, an arc-shaped limiting through hole 61 is arranged on the second sieve basin 6, the arc-shaped rack 7 is positioned in the arc-shaped limiting through hole 61, a linear rack 8 is arranged at the end part of the blanking hopper 2, and the arc-shaped rack 7 and the linear rack 8 are in meshing transmission; second sieve basin 6 drives first sieve basin 5 at the in-process that carries out horizontal reciprocating motion and carries out reciprocating motion to rely on arc rack 7 and sharp rack 8 to make first sieve basin 5 carry out forward reverse rotation at reciprocating motion's in-process, thereby make the cereal in first sieve basin 5 can increase the screening area along a plurality of directions motion when the screening, thereby improve screening efficiency.

Example 6:

as shown in fig. 4, in combination with the technical solution of embodiment 5, in this embodiment, a top rod 34 is disposed at the upper end of the transmission bevel gear 33, an annular push piece 35 is disposed in the elliptical track 24, and the top rod 34 penetrates through the rotary table 23 and is connected with the annular push piece 35; a first spring 27 is arranged at the end part of the guide rod 26, the first spring 27 is positioned in the sliding rod 22, and one end of the first spring 27 is connected with the end part of the guide rod 26, so that the guide rod 26 can be telescopically limited in the end part of the sliding rod 22; one side of the outer ring of the limiting pipe 21 is provided with an arc-shaped guide part 10, and one end of the arc-shaped guide part 10 is connected with the discharging hopper 2; guide bar 26 rotates and arc guide 10 butt through the shrink to make annular push jack 35 promote behind guide bar 26 break away from oval track 24, enter into arc guide 10 through the upset in, with come to carry out the spacing that stretches out and draws back guide bar 26 through arc guide 10, thereby the guide bar 26 of the upset return of being convenient for can enter into oval track 24.

Specifically, as shown in fig. 7 and 11, an arc-shaped partition plate 71 is slidably arranged on the arc-shaped limiting through hole 61, a wedge block 72 is slidably arranged on the bracket 1, and the wedge block 72 is connected with the arc-shaped partition plate 71; a second limiting rod 73 is fixedly arranged below the bracket 1, the wedge block 72 is slidably sleeved on the second limiting rod 73, a second spring 74 is sleeved on the second limiting rod 73, and the end part of the wedge block 72 is abutted against the second spring 74; the collection frame 54 pushes the wedge block 72 to descend by rotating, so as to drive the arc-shaped baffle 71 to descend to open the arc-shaped limiting through hole 61.

Specifically, as shown in fig. 4, a first L-shaped rod 81 is fixedly connected to the push rod 42, a second L-shaped rod 82 is hinged to the lower hopper 2 on one side of the support 1, one end of the second L-shaped rod 82 is hinged to one end of the first L-shaped rod 81, a limit nail 83 is arranged at the other end of the second L-shaped rod 82, a limit hole 84 in plug-in connection with the limit nail 83 is arranged on the limit pipe 21, so that the plug-in connection and matching between the limit nail 83 and the limit hole 84 are controlled by the lifting motion of the push rod 42, and when the sieve basin 3 performs reciprocating motion to sieve grains, the limit nail 83 is positioned in the limit hole 84, so as to prevent the limit pipe 21 from rotating; when the sieve basin 3 needs to be turned over, the push rod 42 moves upwards to push the transmission bevel gear 33 to be meshed with the bevel gear disc 31 for transmission, the first L-shaped rod 81 pushes the second L-shaped rod 82 to rotate, so that the limiting nail 83 is separated from the limiting hole 84, the rotational freedom degree of the limiting pipe 21 is released, and the limiting pipe is driven by the transmission bevel gear 33 to drive the bevel gear disc 31 to rotate to drive the sieve basin 3 to turn over and remove impurities.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Those skilled in the art can make many possible variations and modifications to the disclosed solution, or modify equivalent embodiments using the teachings set forth above, without departing from the scope of the claimed solution. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are all within the protection scope of the present invention, unless the content of the technical scheme of the present invention is departed from.

Claims

1. The grain screening device is characterized by comprising a support (1), a blanking hopper (2), a screening basin (3), a reciprocating mechanism and a blanking mechanism, wherein the blanking hopper (2) is arranged on the support (1); the sieve basin (3) is movably arranged in the port of the blanking hopper (2); a support frame (11) is arranged on one side of the support frame (1), and two ends of the reciprocating mechanism are rotatably connected to the support frame (11) and the discharging hopper (2) so that the screening basin (3) can reciprocate in the discharging hopper (2) to screen grains; the bracket (1) is provided with a driving part (4) for driving the reciprocating mechanism to move; the blanking mechanism is arranged on the bracket (1), and one end of the blanking mechanism is abutted against the end part of the reciprocating mechanism so that the reciprocating mechanism controls the blanking speed of the other end of the blanking mechanism;

the reciprocating mechanism comprises a limiting pipe (21), a sliding rod (22) and a turntable (23) provided with an oval track (24), and the limiting pipe (21) is rotatably arranged between the blanking hoppers (2); the sliding rod (22) is arranged in the limiting pipe (21) in a sliding mode, and the rotary disc (23) is connected to the output end of the driving part (4); a strip-shaped through hole (25) is formed in the limiting pipe (21), a guide rod (26) is arranged at the end part of the sliding rod (22), and the guide rod (26) penetrates through the strip-shaped through hole (25) to enable the end part to be located in the oval track (24);

the blanking mechanism comprises a blanking inclined tube (91), a horizontal discharging tube (92) and a U-shaped rod (93), a cover body (9) is arranged on the support (1), the horizontal discharging tube (92) is arranged on the cover body, the blanking inclined tube (91) is connected onto the horizontal discharging tube (92), one end of the U-shaped rod (93) is abutted to the sliding rod (22), and the other end of the U-shaped rod (93) is slidably located in the horizontal discharging tube (92); the U-shaped rod (93) is connected with one surface of the cover body through a plurality of springs;

the bracket (1) is also provided with a turnover mechanism and a sundry removing mechanism, and the output end of the driving part (4) is in transmission connection with the turnover mechanism through a switching component; the impurity discharging mechanism is connected with the turnover mechanism, so that in the process that the turnover mechanism drives the sieve basin (3) to turn, the impurity discharging mechanism is pulled to rotate and enter the discharging hopper (2) to collect the screened impurities;

the turnover mechanism comprises a conical tooth disc (31), a rectangular rod (32) and a transmission bevel gear (33), wherein the conical tooth disc (31) is arranged on the limiting pipe (21); the driving part (4) is a driving motor, the rectangular rod (32) is connected to the output end of the driving motor, the turntable (23) is fixedly connected to the end part of the rectangular rod (32), and the transmission bevel gear (33) is connected to the rectangular rod (32) in a sliding manner; the switching assembly is in rolling connection with the transmission bevel gear (33), so that the switching assembly pushes the transmission bevel gear (33) to be meshed with the bevel gear disc (31) through telescopic motion;

the switching component comprises a magnetic suction component (41) and a push rod (42), the magnetic suction component (41) is arranged below the bracket (1), a roller (43) is rotatably arranged at the end part of the push rod (42), an annular limiting groove (44) is arranged on the lower end surface of the transmission bevel gear (33), and the roller (43) is limited in the annular limiting groove (44); the other end of the push rod (42) penetrates through the bracket (1) to be connected with the magnetic suction component (41);

the impurity removing mechanism comprises a telescopic beam (51), a pull rod (52), a rotating beam (53) and a collecting frame (54), and the pull rod (52) is arranged on the bracket (1) in a sliding manner; one end of the telescopic beam (51) is hinged to the conical fluted disc (31), and the other end of the telescopic beam (51) is fixedly connected with the end part of the pull rod (52); the rotating beam (53) is rotatably arranged on the bracket (1) through a rotating shaft, and the collecting frame (54) is connected to the end part of the rotating beam (53); the rotating shaft is provided with rotating teeth (56), the pull rod (52) is provided with a plurality of teeth, and the pull rod (52) enables the teeth to be in meshing transmission with the rotating teeth (56) through linear motion; a material box (57) is detachably placed in the collecting frame (54); an arc-shaped opening (20) is formed in the discharging hopper (2), the rotating beam (53) is pulled by the pull rod (52) to rotate, so that the collecting frame (54) is driven to rotate and enter the discharging hopper (2) through the arc-shaped opening (20);

the upper end of the transmission bevel gear (33) is provided with a push rod (34), an annular push sheet (35) is arranged in the oval track (24), and the push rod (34) penetrates through the turntable (23) to be connected with the annular push sheet (35); a first spring (27) is arranged at the end part of the guide rod (26) so that the guide rod (26) can be telescopically arranged at the end part of the sliding rod (22); an arc-shaped guide piece (10) is arranged on one side of the outer ring of the limiting pipe (21), and one end of the arc-shaped guide piece (10) is connected with the blanking hopper (2); the guide rod (26) is abutted with the arc-shaped guide piece (10) through contraction and rotation;

the screening basin (3) comprises a first screening basin (5) provided with screening holes and a second screening basin (6) for limiting the first screening basin (5), one side of the second screening basin (6) is fixedly connected with the sliding rod (22), and the other side of the second screening basin (6) is connected with one side of the blanking hopper (2) in a sliding mode through a first limiting rod; be equipped with arc rack (7) on first sieve basin (5), be equipped with arc spacing through-hole (61) on second sieve basin (6), arc rack (7) are located in arc spacing through-hole (61), the tip of hopper (2) is equipped with sharp rack (8) down, arc rack (7) with sharp rack (8) meshing transmission.

2. A grain screening device according to claim 1, characterized in that an arc-shaped separation baffle (71) is slidably arranged on the arc-shaped limiting through hole (61), a wedge-shaped block (72) is slidably arranged on the bracket (1), and the wedge-shaped block (72) is connected with the arc-shaped separation baffle (71); a second limiting rod (73) is fixedly arranged below the bracket (1), the wedge block (72) is slidably sleeved on the second limiting rod (73), a second spring (74) is sleeved on the second limiting rod (73), and the end part of the wedge block (72) is abutted to the second spring (74); the collecting frame (54) pushes the wedge-shaped block (72) to descend through rotation so as to drive the arc-shaped baffle plate (71) to descend to open the arc-shaped limiting through hole (61).