CN117258906B - Multistage cereal screening plant that mills - Google Patents
Multistage cereal screening plant that mills Download PDFInfo
- Publication number
- CN117258906B CN117258906B CN202311567789.4A CN202311567789A CN117258906B CN 117258906 B CN117258906 B CN 117258906B CN 202311567789 A CN202311567789 A CN 202311567789A CN 117258906 B CN117258906 B CN 117258906B
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- plate
- end surface
- groove
- shell
- face
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- 238000012216 screening Methods 0.000 title claims abstract description 170
- 235000013339 cereals Nutrition 0.000 title claims description 58
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 116
- 238000000227 grinding Methods 0.000 claims abstract description 64
- 238000001179 sorption measurement Methods 0.000 claims abstract description 60
- 229910052742 iron Inorganic materials 0.000 claims abstract description 58
- 238000003801 milling Methods 0.000 claims abstract description 40
- 238000010521 absorption reaction Methods 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims description 58
- 229920003023 plastic Polymers 0.000 claims description 58
- 230000000903 blocking effect Effects 0.000 claims description 39
- 238000003780 insertion Methods 0.000 claims description 34
- 230000037431 insertion Effects 0.000 claims description 34
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 239000004677 Nylon Substances 0.000 claims description 8
- 229920001778 nylon Polymers 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 16
- 238000001914 filtration Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 9
- 230000004888 barrier function Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C7/00—Crushing or disintegrating by disc mills
- B02C7/18—Disc mills specially adapted for grain
- B02C7/184—Disc mills specially adapted for grain with vertical axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C7/00—Crushing or disintegrating by disc mills
- B02C7/11—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B15/00—Combinations of apparatus for separating solids from solids by dry methods applicable to bulk material, e.g. loose articles fit to be handled like bulk material
Abstract
The invention provides a multi-stage grain milling and screening device, which relates to the technical field of grain milling and comprises: the magnetic absorption device comprises a primary screening shell, wherein a primary screening groove is formed in the bottom end surface of the primary screening shell, a group of magnetic absorption parts are arranged on the top surface of the inner end of the primary screening groove, an insulating matching plate is arranged above the right side of the top end surface of the primary screening shell, an insulating baffle plate is arranged on the bottom end surface of the insulating matching plate, and the insulating baffle plate is in sliding connection with the inside of a baffle connection opening; according to the invention, when the magnetic adsorption piece breaks down and the magnetic adsorption filtering operation cannot be performed, the bottom end of the insulating baffle plate contacts the vibrating plate a at the first time, so that the grains on the vibrating plate a are conveyed and sealed, the grains possibly containing iron impurities are prevented from entering a subsequent grinding process, and the problem that if an electromagnet for magnetically adsorbing and filtering the iron impurities breaks down and the corresponding magnetic adsorption filtering cannot be performed, the grains cannot be intercepted in the conveying process is solved.
Description
Technical Field
The invention relates to the technical field of grain milling, in particular to a multi-stage grain milling and screening device.
Background
Grain milling refers to a milling operation of grain by a mill that grinds the grain into a powder for consumption or feeding.
Before cereal mills, in order to guarantee the normal operating of process of milling, usually need filter the clearance to the iron impurity that probably contains in the cereal to avoid iron impurity to get into together and lead to milling the part impaired along with cereal, the iron impurity that probably contains in the cereal of ordinary adopting the electro-magnet realization to carry out the magnetism to transport the in-process now and inhale the filtration, but if be used for magnetism to inhale the electro-magnet of filtering iron impurity and break down, can't play corresponding magnetism inhale when filtering, the staff can't judge in time and learn, and in case the electro-magnet breaks down, it can't realize also the interception to cereal in the transportation process, lead to probably containing iron impurity's cereal entering the process of milling, thereby cause the damage to milling the part.
Disclosure of Invention
In view of the above, the present invention provides a multi-stage grain milling and screening device, which realizes magnetic absorption and filtration of iron impurities possibly contained in grains through a magnetic absorption adsorption piece, so as to ensure that the milled parts are not damaged due to iron impurity residues during subsequent grain milling.
The invention provides a multi-stage grain milling and screening device, which specifically comprises: the primary screening shell is of a square shell structure, a primary screening groove is formed in the bottom end face of the primary screening shell, and the primary screening groove is of a square groove structure; a rectangular bulge is arranged on the left side of the top end surface of the primary screening shell, an adding opening is formed in the top end surface of the rectangular bulge, the bottom surface of the inner end of the adding opening adopts an inclined surface structure with a left bottom and a right top, and the left side of the bottom surface of the inner end of the adding opening is communicated with the primary screening groove; a group of magnetic absorption parts are arranged on the top surface of the inner end of the primary screening groove, the magnetic absorption parts are electromagnets, the magnetic absorption parts are of rectangular block structures, and the lengths of the magnetic absorption parts are consistent with the side length of the primary screening groove; a blocking plate is arranged between the upper surface of the inner end of the primary screening groove relative to the connecting part of the adding opening and the primary screening groove and the left end surface of the magnetic attraction adsorption piece, the blocking plate is of a rectangular plate structure, the length of the blocking plate is consistent with the side length of the primary screening groove, and the height of the blocking plate is larger than the thickness of the magnetic attraction adsorption piece; a blocking insertion opening communicated with the primary screening groove is formed in the right side of the top end surface of the primary screening shell, the blocking insertion opening is of a rectangular opening structure, the length of the blocking insertion opening is consistent with the side length of the primary screening groove, and the left side surface of the inner end of the blocking insertion opening and the right end surface of the magnetic attraction adsorption piece are in the same vertical plane; an insulating matching plate is arranged above the right side of the top end surface of the primary screening shell, the insulating matching plate is of a rectangular plate structure, an insulating baffle plate is arranged on the bottom end surface of the insulating matching plate, the insulating baffle plate is of a rectangular plate structure, and the insulating baffle plate is slidably inserted into the blocking insertion opening; the included angle parts of the edges of the bottom end face of the insulating matching plate are fixedly connected with the top end face of the primary screening shell through an insulating spring; two limit posts are fixedly arranged on the top surface of the primary screening shell in a front-back symmetrical mode, and the limit posts are positioned on the left side of the blocking insertion opening; an iron plate is arranged above the top end surface of the primary screening shell, the iron plate is of a rectangular plate structure, two limit sliding jacks are formed in the front-back symmetrical shape of the top end surface of the iron plate, and two limit posts are respectively inserted into the two limit sliding jacks in a sliding manner; a longitudinal supporting plate is arranged between the top end surface of the primary screening shell opposite to the limit column and the blocking insertion opening, a transverse connecting plate is fixedly arranged on the top end surface of the longitudinal supporting plate, and a guide round rod is arranged at the left end and the right end of the transverse connecting plate; the top end face of the iron plate is connected with the top end face of the insulating matching plate through three nylon ropes, and the nylon ropes are erected on the two guide round rods; under the state that the insulating spring extends, the bottom end face of the iron plate is not contacted with the top end face of the primary screening shell.
Further, a vibrating plate a is inserted into the first-stage screening groove, the left end of the vibrating plate a penetrates through the left end face of the first-stage screening shell and is positioned at the left side of the left end face of the first-stage screening shell, and three groups of vibrating motors a are arranged at the bottom end face of the vibrating plate a positioned at the left side of the left end face of the first-stage screening shell; the right end of the vibrating plate a is not contacted with the right side surface of the inner end of the primary screen slot; the vibrating plate a is obliquely arranged with high left and low right; in the state that the insulating spring is stretched, the bottom end face of the insulating baffle plate is contacted with the top end face of the vibrating plate a; under the electrified state of the magnetic attraction adsorption piece, the iron plate is magnetically attracted through the magnetic attraction adsorption piece, at the moment, the bottom end face of the iron plate is contacted with the top end face of the primary screening shell, the insulating spring is in a stretched state, and the bottom end face of the insulating barrier plate is not contacted with the top end face of the vibrating plate a.
Further, the right end face of the rectangular bulge is provided with a pressing notch, the pressing notch is of a rectangular groove structure, and the pressing notch penetrates through the front end face and the rear end face of the rectangular bulge; the top end surface of the rectangular bulge is provided with a limit inserting opening which is communicated with the pressing notch relative to the pressing notch, and the limit inserting opening is in a rectangular opening structure; the left end of the iron plate is slidably arranged in the pressing notch, and the top end surface of the iron plate is contacted with the bottom surface of the inner end of the pressing notch when the insulating spring is in an extended state; a plastic plugboard is inserted into the limiting insertion opening, the plastic plugboard is of a rectangular plate structure, a U-shaped rotating fit protrusion is arranged on the top end face of the plastic plugboard, and a shaft hole is formed in the shaft center of the semicircular structure of the U-shaped rotating fit protrusion; when the bottom end surface of the plastic plug board and the bottom surface of the inner end of the pressing notch are positioned on the same horizontal plane, the U-shaped rotating fit protrusion is positioned outside the limiting plug opening; a plastic shielding plate is arranged above the plastic plugboard and is of a rectangular plate structure, a rotary fit notch is formed in the bottom end face of the plastic shielding plate, the rotary fit notch is of a rectangular groove structure, a rotating shaft b is connected between the front face and the rear face of the inner end of the rotary fit notch, and the rotating shaft b is connected with the rotation of the shaft hole.
Further, when the bottom end surface of the plastic plug board and the bottom surface of the inner end of the pressing notch are positioned on the same horizontal plane, the plastic shielding plate completely shields the opening end part of the top of the adding opening; the top end surfaces of the two limiting columns are jointly provided with a matching block, and the left end surface of the matching block is provided with an abutting spring; when the iron plate is magnetically attracted by the magnetic attraction adsorption piece, the bottom end face of the iron plate is contacted with the top end face of the primary screening shell, the plastic shielding plate and the plastic plugboard are both slidingly inserted into the limiting insertion opening, the plastic shielding plate is contacted with the left end of the pressing spring, and the pressing spring is in a compressed state.
Further, an adsorption cylinder is arranged on the right side of the inner end of the primary screen groove, the adsorption cylinder is a cylinder, and the front end face and the rear end face of the adsorption cylinder are fixedly connected with the front end face and the rear end face of the inner end of the primary screen groove; the inner peripheral surface of the adsorption cylinder is provided with a rotary column, the rotary column is a cylinder, the outer peripheral surface of the rotary column is provided with a friction layer, the friction layer is insulating fur, and the friction layer is contacted with the inner peripheral surface of the adsorption cylinder; the axle center parts of the front end face and the rear end face of the rotating column are respectively provided with a rotating shaft a, and the rotating shafts a are rotatably connected with the primary screening shell through bearings; the front end face of the primary screening shell is fixedly provided with a group of motors a, and the rotating shaft ends of the motors a are fixedly connected with the rotating shaft a.
Furthermore, the front end face and the rear end face of the primary screening shell are both provided with an extension mounting plate a, the extension mounting plate a is of a rectangular plate structure, and two mounting hole sites a are formed in the extension mounting plate a; a secondary screening shell is arranged below the primary screening shell, the secondary screening shell is of a square shell structure, an extending mounting plate b is arranged on the front end face and the rear end face of the secondary screening shell, the extending mounting plate b is of a rectangular plate structure, two mounting hole sites b are formed in the extending mounting plate b, and the mounting hole sites b are fixedly connected with the mounting hole site a through bolts; the secondary screening casing top face has seted up a secondary screening groove, and the secondary screening groove is square groove structure, installs a vibrating plate b in the secondary screening groove, and vibrating plate b right-hand member link up secondary screening casing right-hand member face and is located its right side, and is located the vibrating plate b bottom face on secondary screening casing right-hand member face right side and installs three vibrating motor b of group, has offered screening mesh in evenly distributed form on the vibrating plate b that is located secondary screening inslot portion.
Furthermore, a grinding matching shell is fixedly arranged on the bottom end surface of the secondary screening shell through a feeding connecting block, and the grinding matching shell and the feeding connecting block are of round block structures; the bottom end surface of the milling matching shell is provided with a milling groove which is in a circular groove structure; the end face of the bottom of the secondary screen tank is provided with a converging groove, the top of the converging groove is of a square structure, and the bottom of the converging groove is of a circular structure; the axis part of the feeding connecting block is provided with a feeding opening communicated with the converging groove and the milling groove; an upper grinding disc is arranged on the top surface of the inner end of the grinding groove, the diameter of the upper grinding disc is smaller than that of the grinding groove, a feeding opening which penetrates through the top end surface of the upper grinding disc is formed in the bottom end surface of the upper grinding disc relative to the feeding opening part, and the feeding opening is a round hole.
Furthermore, the bottom end of the secondary screening shell is provided with four L-shaped mounting plates in an annular array shape, and the short end of each L-shaped mounting plate is provided with a mounting hole site c; an aggregate shell is arranged below the secondary screening shell, the aggregate shell is of a circular shell structure, four extension mounting plates c are arranged on the periphery of the aggregate shell in an annular array shape, mounting holes d are formed in the extension mounting plates c, and the mounting holes d are fixedly connected with the mounting holes c through bolts; a round supporting frame is arranged on the bottom end surface of the aggregate shell; the diameter of the aggregate shell is larger than that of the milling matched shell, a collecting groove is formed in the top end face of the aggregate shell, a matched bulge is arranged at the axis position of the bottom face of the inner end of the aggregate groove, the matched bulge is of a circular block structure, the diameter of the matched bulge is smaller than that of the milling groove, and at the moment, the longitudinal section of the aggregate groove is of an inclined surface structure with the outer side low and the inner side high; the bottom end surface of the aggregate shell is provided with an embedded mounting groove, and a group of motors b are arranged in the embedded mounting groove; a lower grinding disc is arranged above the matching bulge, and a motor b penetrates through the top end surface of the matching bulge and is fixedly connected with the lower grinding disc; when the installation hole d is fixedly connected with the installation hole c through bolts, the positions of the lower grinding disc and the upper grinding disc correspond to each other, and a grinding space is reserved between the lower grinding disc and the upper grinding disc.
The multi-stage grain milling and screening device provided by the invention has the following beneficial effects:
1. according to the multistage grain milling and screening device provided by the invention, the magnetic adsorption piece is used for realizing magnetic adsorption and filtration of iron impurities possibly contained in grains, so that the damage of milling parts caused by iron impurity residues in subsequent grain milling is avoided.
2. According to the multistage grain milling and screening device provided by the invention, through the arrangement of the plastic shielding plate, when the magnetic attraction adsorption piece is electrified and normally magnetically attracted, the plastic shielding plate can be slidably inserted into the limiting insertion opening together with the plastic insertion plate, and the plastic shielding plate is in a vertical state without shielding the adding opening, so that the plastic shielding plate is convenient for workers to observe, and when the magnetic attraction adsorption piece breaks down, the iron plate and the pressing spring are pressed together, the plastic shielding plate is separated from the vertical state, the top opening end part of the adding opening is completely shielded, and the position of the plastic shielding plate is changed, so that the current magnetic attraction adsorption piece is convenient for the workers to observe and judge, and the current magnetic attraction adsorption piece is known to break down and needs to be maintained in time.
3. According to the multistage grain grinding and screening device provided by the invention, the friction layer and the adsorption cylinder rotate through friction, so that the adsorption cylinder can generate static electricity, and when grains fall downwards along the right side edge of the vibrating plate a, electrostatic adsorption and filtration can be carried out on films possibly contained in the grains through the adsorption cylinder, so that no film residue is caused during subsequent grain grinding.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
The drawings described below are only for illustration of some embodiments of the invention and are not intended to limit the invention.
In the drawings:
fig. 1 is a schematic front view of a magnetic attraction member according to an embodiment of the invention in an unpowered state.
Fig. 2 is a schematic view of the left end perspective view of the magnetic attraction member in the non-energized state according to the embodiment of the invention.
Fig. 3 is a schematic view of the right end of the magnetic attraction member in the unpowered state.
Fig. 4 is a schematic view of the bottom end perspective structure of the magnetic attraction member in the non-energized state according to the embodiment of the invention.
Fig. 5 is a schematic diagram of the structure of an embodiment of the present invention in a disassembled state.
Fig. 6 is a schematic diagram of the top end of a primary screening housing in an isometric configuration according to an embodiment of the present invention.
Fig. 7 is an isometric view of the bottom end of a primary screening housing according to an embodiment of the present invention.
Figure 8 is a schematic cross-sectional view of a primary screening housing of an embodiment of the present invention.
Fig. 9 is a schematic diagram of the top end of a secondary screening housing in an isometric view of an embodiment of the present invention.
Fig. 10 is an isometric view of the bottom end of a secondary screening housing according to an embodiment of the present invention.
FIG. 11 is a schematic cross-sectional view of a secondary screening housing of an embodiment of the present invention.
Fig. 12 is a schematic view of the top end of the aggregate housing in an embodiment of the invention in an isometric view.
Fig. 13 is an isometric view of the bottom end of the aggregate housing of an embodiment of the invention.
Fig. 14 is a schematic view of an insulating mating plate structure according to an embodiment of the present invention.
Fig. 15 is a schematic view showing a structure of the plastic shielding plate in a detached state from the plastic plugboard according to an embodiment of the present invention.
Fig. 16 is a schematic cross-sectional view of a magnetic adsorbing member in a non-energized state according to an embodiment of the present invention.
Fig. 17 is a partially enlarged schematic construction view of fig. 16 at a in accordance with an embodiment of the present invention.
Fig. 18 is a schematic view showing a structure of the magnetic attraction member in fig. 17 in an energized state according to an embodiment of the invention.
List of reference numerals
1. A primary screening housing; 101. rectangular protrusions; 102. an extension mounting plate a; 103. mounting a hole site a; 104. a motor a; 105. pressing the notch; 106. blocking the insertion opening; 107. a longitudinal support plate; 108. a transverse connection plate; 109. guiding the round rod; 1010. a mating block; 1011. a limit column; 1012. pressing the spring; 1013. an addition opening; 1014. a vibration plate a; 1015. limiting the inserting opening; 1016. an adsorption cylinder; 1017. a first-stage screening groove; 1018. a vibration motor a; 1019. a rotating shaft a; 1020. a magnetic absorption member; 1021. a rotating column; 1022. a friction layer; 1023. a blocking plate; 2. a secondary screening housing; 201. a second-stage sieve groove; 202. an extension mounting plate b; 203. installing a hole site b; 204. an L-shaped mounting plate; 205. installing a hole site c; 206. a vibration plate b; 207. screening the meshes; 208. milling the matched shell; 209. grinding grooves; 2010. an upper millstone; 2011. a feeding hole is formed; 2012. a vibration motor b; 2013. a converging tank; 2014. a feeding connecting block; 2015. feeding and perforating; 3. an aggregate housing; 301. a circular support frame; 302. an extension mounting plate c; 303. installing a hole site d; 304. a material collecting groove; 305. fitting the protrusion; 306. a lower grinding disc; 307. an embedded mounting groove; 308. a motor b; 4. an insulating mating board; 401. an insulating barrier; 402. an insulating spring; 403. an iron plate; 404. nylon ropes; 405. limiting sliding jacks; 5. a plastic shielding plate; 501. a groove is matched in a rotating way; 502. a rotating shaft b; 503. a plastic plugboard; 504. u-shaped rotating fit protrusions; 505. and the shaft hole.
Detailed Description
In order to make the objects, aspects and advantages of the technical solution of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiment of the present invention.
Please refer to fig. 1 to 18:
embodiment one: the invention provides a multi-stage grain grinding and screening device, which comprises a primary screening shell 1, wherein the primary screening shell 1 is of a square shell structure, a primary screening groove 1017 is formed in the bottom end surface of the primary screening shell 1, and the primary screening groove 1017 is of a square groove structure; a rectangular bulge 101 is arranged on the left side of the top end surface of the first-stage screening shell 1, an adding opening 1013 is formed in the top end surface of the rectangular bulge 101, the bottom surface of the inner end of the adding opening 1013 adopts an inclined surface structure with the left bottom and the right top, and the left side of the bottom surface of the inner end of the adding opening 1013 is communicated with a first-stage screening groove 1017; a group of magnetic attraction and adsorption pieces 1020 are arranged on the top surface of the inner end of the primary screening groove 1017, the magnetic attraction and adsorption pieces 1020 are electromagnets, the magnetic attraction and adsorption pieces 1020 are of rectangular block structures, and the length of the magnetic attraction and adsorption pieces 1020 is consistent with the side length of the primary screening groove 1017; a blocking plate 1023 is arranged between the upper surface of the inner end of the first-stage screening groove 1017 relative to the communicating part of the adding opening 1013 and the first-stage screening groove 1017 and the left end surface of the magnetic attraction adsorption piece 1020, the blocking plate 1023 is of a rectangular plate structure, the length of the blocking plate 1023 is consistent with the side length of the first-stage screening groove 1017, and the height of the blocking plate 1023 is larger than the thickness of the magnetic attraction adsorption piece 1020; a blocking insertion opening 106 communicated with the primary screening groove 1017 is formed on the right side of the top end surface of the primary screening shell 1, the blocking insertion opening 106 is of a rectangular opening structure, the length of the blocking insertion opening 106 is consistent with the side length of the primary screening groove 1017, and the left side surface of the inner end of the blocking insertion opening 106 and the right end surface of the magnetic attraction adsorption piece 1020 are in the same vertical plane; an insulating matching plate 4 is arranged above the right side of the top end surface of the primary screening shell 1, the insulating matching plate 4 is of a rectangular plate structure, an insulating baffle plate 401 is arranged on the bottom end surface of the insulating matching plate 4, the insulating baffle plate 401 is of a rectangular plate structure, and the insulating baffle plate 401 is in sliding connection with the inside of the blocking connection opening 106; the included angle parts of the edges around the bottom end surface of the insulating matching plate 4 are fixedly connected with the top end surface of the primary screening shell 1 through an insulating spring 402; two limit posts 1011 are fixedly arranged on the top surface of the primary screening shell 1 in a front-back symmetrical way, and the limit posts 1011 are positioned on the left side of the blocking insertion opening 106; an iron plate 403 is arranged above the top end surface of the primary screening shell 1, the iron plate 403 is of a rectangular plate structure, two limit sliding jacks 405 are formed in the front-back symmetrical mode on the top end surface of the iron plate 403, and two limit posts 1011 are respectively inserted into the two limit sliding jacks 405 in a sliding mode; a longitudinal supporting plate 107 is arranged between the top end surface of the primary screening shell 1 opposite to the limit column 1011 and the blocking insertion opening 106, a transverse connecting plate 108 is fixedly arranged on the top end surface of the longitudinal supporting plate 107, and a guide round rod 109 is arranged at the left end and the right end of the transverse connecting plate 108; the top end face of the iron plate 403 is connected with the top end face of the insulating matching plate 4 through three nylon ropes 404, and the nylon ropes 404 are erected on the two guide round rods 109; in the state that the insulating spring 402 is in an extending state, the bottom end surface of the iron plate 403 is not contacted with the top end surface of the primary screening shell 1, a vibrating plate a1014 is inserted into the primary screening groove 1017, the left end of the vibrating plate a1014 penetrates through the left end surface of the primary screening shell 1 and is positioned at the left side of the left end surface, and three groups of vibrating motors a1018 are arranged on the bottom end surface of the vibrating plate a1014 positioned at the left side of the left end surface of the primary screening shell 1; the right end of the vibration plate a1014 is not contacted with the right side surface of the inner end of the first-stage screen slot 1017; the vibration plate a1014 is inclined with the left side high and the right side low; in the state that the insulating spring 402 is extended, the bottom end surface of the insulating barrier 401 is in contact with the top end surface of the vibration plate a 1014; in the state that the magnetic attraction adsorbing piece 1020 is electrified, the iron plate 403 is magnetically attracted by the magnetic attraction adsorbing piece 1020, at this time, the bottom end face of the iron plate 403 is contacted with the top end face of the primary screening shell 1, the insulating spring 402 is in a stretched state, and the bottom end face of the insulating baffle 401 is not contacted with the top end face of the vibrating plate a 1014.
Wherein, the right end face of the rectangular bulge 101 is provided with a pressing notch 105, the pressing notch 105 is in a rectangular groove structure, and the pressing notch 105 penetrates through the front end face and the rear end face of the rectangular bulge 101; a limit inserting opening 1015 communicated with the pressing notch 105 is formed on the top end surface of the rectangular protrusion 101 relative to the pressing notch 105, and the limit inserting opening 1015 is in a rectangular opening structure; the left end of the iron plate 403 is slidably mounted in the pressing notch 105, and in the extended state of the insulating spring 402, the top end surface of the iron plate 403 contacts with the bottom surface of the inner end of the pressing notch 105; a plastic plugboard 503 is spliced in the limiting grafting opening 1015, the plastic plugboard 503 is of a rectangular plate structure, a U-shaped rotating fit protrusion 504 is arranged on the top end surface of the plastic plugboard 503, and a shaft hole 505 is formed in the axle center of the semicircular structure of the U-shaped rotating fit protrusion 504; when the bottom end surface of the plastic plugboard 503 and the bottom surface of the inner end of the pressing notch 105 are in the same horizontal plane, the U-shaped rotating fit protrusion 504 is located outside the limiting plug opening 1015; a plastic shielding plate 5 is arranged above the plastic plugboard 503, the plastic shielding plate 5 is of a rectangular plate structure, a rotary fit notch 501 is formed in the bottom end surface of the plastic shielding plate 5, the rotary fit notch 501 is of a rectangular groove structure, a rotating shaft b502 is connected between the front surface and the rear surface of the inner end of the rotary fit notch 501, the rotating shaft b502 is rotationally connected with a shaft hole 505, and when the bottom end surface of the plastic plugboard 503 and the bottom surface of the inner end of the pressing notch 105 are in the same horizontal plane, the plastic shielding plate 5 completely shields the top opening end part of the adding opening 1013; the top end surfaces of the two limit posts 1011 are jointly provided with a matching block 1010, and the left end surface of the matching block 1010 is provided with a pressing spring 1012; when the iron plate 403 is magnetically attracted by the magnetic attraction adsorbing piece 1020, the bottom end surface of the iron plate 403 contacts with the top end surface of the primary screening housing 1, at this time, the plastic shielding plate 5 and the plastic plug plate 503 are both slidingly inserted into the limiting insertion opening 1015, the plastic shielding plate 5 contacts with the left end of the pressing spring 1012, and the pressing spring 1012 is in a compressed state.
Specific use and action of the embodiment:
when the magnetic adsorption piece 1020 is electrified and started, the magnetic adsorption piece 1020 attracts the iron plate 403, the bottom end surface of the iron plate 403 contacts with the top end surface of the first-stage screening shell 1, the insulating baffle plate 401 moves upwards along the blocking insertion opening 106 under the driving of the iron plate 403, and the bottom end of the insulating baffle plate 401 is not contacted with the vibration plate a1014, so that a space for conveying grains is reserved;
when the magnetic attraction adsorption piece 1020 attracts the iron plate 403, the plastic shielding plate 5 and the plastic plug board 503 can be slidably inserted into the limit insertion opening 1015 without the obstruction of the iron plate 403;
during grain grinding and screening application, grains are poured into the adding opening 1013, at the moment, the grains flow into the vibrating plate a1014 in the first-stage screening groove 1017 along the inclined surface of the bottom surface of the inner end of the adding opening 1013, at the moment, under the vibration action of the vibrating motor a1018, the grains falling on the vibrating plate a1014 slide rightwards along the vibrating plate a1014, and the excessively-piled grains are pushed down through the blocking arrangement of the blocking plate 1023, so that the excessively-piled grains are prevented from being excessively piled up, and in the process of sliding the grains rightwards along the vibrating plate a1014, the magnetic adsorption piece 1020 carries out magnetic adsorption filtration on iron impurities possibly contained in the grains on the vibrating plate a1014 in real time, so that no iron impurities remain during subsequent grain grinding;
when the magnetic attraction adsorption piece 1020 breaks down and the magnetic attraction filtration operation cannot be performed, the insulating spring 402 in a stretched state rapidly resets and rebounds under the magnetic attraction of the non-magnetic attraction adsorption piece 1020, so that the insulating baffle plate 401 slides downwards along the blocking insertion opening 106, the bottom end of the insulating baffle plate 401 contacts with the vibrating plate a1014, the conveying and sealing of grains on the vibrating plate a1014 are realized, and grains possibly containing iron impurities are prevented from entering a subsequent grinding process;
the iron plate 403 also slides upwards along the limit post 1011 under the pull of the nylon rope 404, and the iron plate 403 slides upwards, meanwhile, the iron plate 403 is pressed against the plastic plugboard 503 which is slidingly inserted into the limit insertion opening 1015, so that the bottom end of the plastic plugboard 503 is completely pressed into the limit insertion opening 1015, at this time, the U-shaped rotating fit protrusion 504 of the plastic plugboard 503 is exposed outside the limit insertion opening 1015, and simultaneously, the plastic shielding plate 5 is also pressed against the reset pressure of the pressing spring 1012, so that the plastic shielding plate 5 rotates leftwards along the U-shaped rotating fit protrusion 504 through the cooperation of the rotating shaft b502 and the shaft hole 505, so that the plastic shielding plate 5 completely shields the top opening end part of the adding opening 1013, and the position of the plastic shielding plate 5 is changed, so that the operator can observe and judge, and thus know that the current magnetic adsorption piece 1020 breaks down, and needs to be maintained in time.
Embodiment two: the multi-stage grain grinding and screening device provided according to the first embodiment realizes magnetic attraction and filtration of iron impurities possibly contained in grains through the magnetic attraction and adsorption piece 1020, and further comprises: an adsorption cylinder 1016 is arranged on the right side of the inner end of the primary screen slot 1017, the adsorption cylinder 1016 is a cylinder, and the front end face and the rear end face of the adsorption cylinder 1016 are fixedly connected with the front end face and the rear end face of the inner end of the primary screen slot 1017; the inner peripheral surface of the adsorption cylinder 1016 is provided with a rotary column 1021, the rotary column 1021 is a cylinder, the outer peripheral surface of the rotary column 1021 is provided with a friction layer 1022, the friction layer 1022 is insulating fur, and the friction layer 1022 is contacted with the inner peripheral surface of the adsorption cylinder 1016; the axial center parts of the front end surface and the rear end surface of the rotary column 1021 are respectively provided with a rotary shaft a1019, and the rotary shafts a1019 are rotatably connected with the primary screening shell 1 through bearings; the front end face of the primary screening shell 1 is fixedly provided with a group of motors a104, and the rotating shaft ends of the motors a104 are fixedly connected with the rotating shaft a 1019.
When the grains magnetically filtered by the magnetic attraction adsorbing member 1020 fall down along the right edge portion of the vibration plate a1014, electrostatic attraction and filtration of the films possibly contained in the grains are realized by the adsorbing cylinder 1016 during the falling process, and the specific operation is as follows: the motor a104 drives the rotary column 1021 to rotate, so that the friction layer 1022 serving as an insulating fur and the inner circumferential surface of the adsorption cylinder 1016 are in friction rotation, and the adsorption cylinder 1016 generates static electricity, so that membranes possibly contained in grains are subjected to static electricity adsorption filtration, and no membrane residues exist in subsequent grain grinding.
Embodiment III: a multi-stage cereal milling and screening device is provided according to the second embodiment, which implements electrostatic adsorption filtration to membranes possibly contained in cereal by means of an adsorption cartridge 1016, and further comprises: the front end face and the rear end face of the primary screening shell 1 are provided with an extension mounting plate a102, the extension mounting plate a102 is of a rectangular plate structure, and two mounting hole sites a103 are formed in the extension mounting plate a 102; a second-stage screening shell 2 is arranged below the first-stage screening shell 1, the second-stage screening shell 2 is of a square shell structure, an extension mounting plate b202 is arranged on the front end face and the rear end face of the second-stage screening shell 2, the extension mounting plate b202 is of a rectangular plate structure, two mounting hole sites b203 are formed in the extension mounting plate b202, and the mounting hole sites b203 are fixedly connected with the mounting hole site a103 through bolts; a secondary screening groove 201 is formed in the top end face of the secondary screening shell 2, the secondary screening groove 201 is of a square groove structure, a vibrating plate b206 is installed in the secondary screening groove 201, the right end of the vibrating plate b206 penetrates through the right end face of the secondary screening shell 2 and is located on the right side of the right end face of the secondary screening shell 2, three groups of vibrating motors b2012 are installed on the bottom end face of the vibrating plate b206 located on the right side of the right end face of the secondary screening shell 2, and screening meshes 207 are formed in the vibrating plate b206 located inside the secondary screening groove 201 in a uniformly distributed mode.
Wherein, the bottom end surface of the secondary screening housing 2 is fixedly provided with a grinding matching housing 208 through a feeding connecting block 2014, and the grinding matching housing 208 and the feeding connecting block 2014 are in a circular block structure; a milling groove 209 is formed in the bottom end surface of the milling matching shell 208, and the milling groove 209 is in a circular groove structure; a converging groove 2013 is formed in the bottom end surface of the secondary screen groove 201, the top of the converging groove 2013 is of a square structure, and the bottom of the converging groove 2013 is of a circular structure; the axial center of the feeding connecting block 2014 is provided with a feeding opening 2015 which is communicated with the converging groove 2013 and the milling groove 209; a top grinding disc 2010 is arranged on the top surface of the inner end of the grinding groove 209, the diameter of the top grinding disc 2010 is smaller than that of the grinding groove 209, a feeding hole 2011 penetrating through the top end surface of the top grinding disc 2010 is formed in the position, corresponding to the feeding hole 2015, of the bottom end surface of the top grinding disc 2010, and the feeding hole 2011 is a round hole.
Four L-shaped mounting plates 204 are arranged at the bottom end surface of the secondary screening shell 2 in an annular array shape, and mounting hole sites c205 are formed in the short ends of the L-shaped mounting plates 204; an aggregate shell 3 is arranged below the secondary screening shell 2, the aggregate shell 3 is of a circular shell structure, four extension mounting plates c302 are arranged on the peripheral surface of the aggregate shell 3 in an annular array shape, mounting hole sites d303 are arranged on the extension mounting plates c302, and the mounting hole sites d303 are fixedly connected with the mounting hole sites c205 through bolts; a round supporting frame 301 is arranged on the bottom end surface of the aggregate shell 3; the diameter of the aggregate shell 3 is larger than that of the milling matching shell 208, an aggregate groove 304 is formed in the top end surface of the aggregate shell 3, a matching protrusion 305 is arranged at the axial center of the bottom surface of the inner end of the aggregate groove 304, the matching protrusion 305 is of a circular block structure, the diameter of the matching protrusion 305 is smaller than that of the milling groove 209, and at the moment, the longitudinal section of the aggregate groove 304 is of an inclined surface structure with the outer side low and the inner side high; the bottom end surface of the aggregate shell 3 is provided with an embedded mounting groove 307, and a group of motors b308 are mounted in the embedded mounting groove 307; a lower grinding disc 306 is arranged above the matching bulge 305, and a motor b308 penetrates through the top end surface of the matching bulge 305 and is fixedly connected with the lower grinding disc 306; when the mounting hole d303 and the mounting hole c205 are fixedly connected through bolts, the positions of the lower grinding disc 306 and the upper grinding disc 2010 correspond to each other, and a grinding space is reserved between the lower grinding disc and the upper grinding disc.
The grains falling along the right edge of the vibrating plate a1014 fall onto the vibrating plate b206 in the secondary screening groove 201, and the grains falling onto the vibrating plate b206 fall into the converging groove 2013 through the screening mesh 207 under the vibration of the vibrating motor b2012, and the impurities such as stones possibly contained in the grains are filtered and intercepted on the vibrating plate b 206;
the grains falling into the converging groove 2013 enter the grinding space between the lower grinding disc 306 and the upper grinding disc 2010 through the feeding opening 2015 and the feeding opening 2011, the motor b308 drives the lower grinding disc 306 to rotate, so that the grains entering the grinding space are matched with the upper grinding disc 2010, grinding operation is achieved jointly, and the ground grain powder falls into the collecting groove 304 of the collecting shell 3, so that subsequent workers can collect the grains in a concentrated mode.
The foregoing is merely exemplary embodiments of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims.
Claims (4)
1. A multi-stage cereal milling and screening apparatus comprising: the primary screening shell (1), the primary screening shell (1) is of a square shell structure, a primary screening groove (1017) is formed in the bottom end surface of the primary screening shell (1), and the primary screening groove (1017) is of a square groove structure; a rectangular bulge (101) is arranged on the left side of the top end surface of the primary screening shell (1), an adding opening (1013) is formed in the top end surface of the rectangular bulge (101), the bottom surface of the inner end of the adding opening (1013) adopts an inclined surface structure with the left bottom and the right top, and the left side of the bottom surface of the inner end of the adding opening (1013) is communicated with a primary screening groove (1017); a group of magnetic absorption parts (1020) are arranged on the top surface of the inner end of the primary screening groove (1017), the magnetic absorption parts (1020) are electromagnets, the magnetic absorption parts (1020) are of rectangular block structures, and the length of the magnetic absorption parts (1020) is consistent with the side length of the primary screening groove (1017); a blocking plate (1023) is arranged between the upper surface of the inner end of the primary screening groove (1017) and the left end surface of the magnetic absorption part (1020) relative to the communicating part of the adding opening (1013) and the primary screening groove (1017), the blocking plate (1023) is in a rectangular plate structure, the length of the blocking plate (1023) is consistent with the side length of the primary screening groove (1017), and the height of the blocking plate (1023) is larger than the thickness of the magnetic absorption part (1020); a blocking insertion opening (106) communicated with the primary screening groove (1017) is formed in the right side of the top end surface of the primary screening shell (1), the blocking insertion opening (106) is of a rectangular opening structure, the length of the blocking insertion opening (106) is consistent with the side length of the primary screening groove (1017), and the left side surface of the inner end of the blocking insertion opening (106) and the right end surface of the magnetic adsorption piece (1020) are in the same vertical plane; an insulating matching plate (4) is arranged above the right side of the top end surface of the primary screening shell (1), the insulating matching plate (4) is of a rectangular plate structure, an insulating baffle plate (401) is arranged on the bottom end surface of the insulating matching plate (4), the insulating baffle plate (401) is of a rectangular plate structure, and the insulating baffle plate (401) is in sliding connection with the inside of the blocking connection opening (106); the included angle parts of the edges around the bottom end surface of the insulating matching plate (4) are fixedly connected with the top end surface of the primary screening shell (1) through an insulating spring (402); two limit posts (1011) are symmetrically and fixedly arranged on the front end surface of the first-stage screening shell (1), and the limit posts (1011) are positioned on the left side of the blocking insertion opening (106); an iron plate (403) is arranged above the top end surface of the primary screening shell (1), the iron plate (403) is of a rectangular plate structure, two limit sliding jacks (405) are formed in the front-back symmetry shape of the top end surface of the iron plate (403), and two limit posts (1011) are respectively in sliding connection with the two limit sliding jacks (405); a longitudinal supporting plate (107) is arranged between the top end surface of the primary screening shell (1) opposite to the limit column (1011) and the blocking insertion opening (106), a transverse connecting plate (108) is fixedly arranged on the top end surface of the longitudinal supporting plate (107), and a guide round rod (109) is arranged at the left end and the right end of the transverse connecting plate (108); the top end face of the iron plate (403) is connected with the top end face of the insulating matching plate (4) through three nylon ropes (404), and the nylon ropes (404) are erected on the two guide round rods (109); in the extending state of the insulating spring (402), the bottom end surface of the iron plate (403) is not contacted with the top end surface of the primary screening shell (1);
a vibrating plate a (1014) is inserted into the first-stage screening groove (1017), the left end of the vibrating plate a (1014) penetrates through the left end face of the first-stage screening shell (1) and is positioned at the left side of the left end face, and three groups of vibrating motors a (1018) are arranged on the bottom end face of the vibrating plate a (1014) positioned at the left side of the left end face of the first-stage screening shell (1); the right end of the vibration plate a (1014) is not contacted with the right side surface of the inner end of the primary screen groove (1017); the vibration plate a (1014) is obliquely arranged with the left side high and the right side low; in the extended state of the insulating spring (402), the bottom end surface of the insulating baffle plate (401) is contacted with the top end surface of the vibrating plate a (1014); in the electrified state of the magnetic adsorption piece (1020), the iron plate (403) is magnetically adsorbed by the magnetic adsorption piece (1020), at the moment, the bottom end surface of the iron plate (403) is contacted with the top end surface of the primary screening shell (1), the insulating spring (402) is in a stretched state, and the bottom end surface of the insulating baffle plate (401) is not contacted with the top end surface of the vibrating plate a (1014);
the front end face and the rear end face of the primary screening shell (1) are respectively provided with an extension mounting plate a (102), the extension mounting plates a (102) are of rectangular plate structures, and two mounting hole sites a (103) are formed in the extension mounting plates a (102); a second-stage screening shell (2) is arranged below the first-stage screening shell (1), the second-stage screening shell (2) is of a square shell structure, an extending mounting plate b (202) is arranged on the front end face and the rear end face of the second-stage screening shell (2), the extending mounting plate b (202) is of a rectangular plate structure, two mounting hole sites b (203) are formed in the extending mounting plate b (202), and the mounting hole sites b (203) are fixedly connected with the mounting hole site a (103) through bolts; a secondary screening groove (201) is formed in the top end surface of the secondary screening shell (2), the secondary screening groove (201) is of a square groove structure, a vibrating plate b (206) is installed in the secondary screening groove (201), the right end of the vibrating plate b (206) penetrates through the right end surface of the secondary screening shell (2) and is positioned on the right side of the right end surface, three groups of vibrating motors b (2012) are installed on the bottom end surface of the vibrating plate b (206) positioned on the right side of the right end surface of the secondary screening shell (2), and screening meshes (207) are uniformly distributed on the vibrating plate b (206) positioned in the secondary screening groove (201);
the bottom end surface of the secondary screening shell (2) is fixedly provided with a milling matching shell (208) through a feeding connecting block (2014), and the milling matching shell (208) and the feeding connecting block (2014) are of round block structures; a grinding groove (209) is formed in the bottom end surface of the grinding matching shell (208), and the grinding groove (209) is in a circular groove structure; a converging groove (2013) is formed in the bottom end surface of the secondary screen groove (201), the top of the converging groove (2013) is of a square structure, and the bottom of the converging groove (2013) is of a circular structure; the axial center part of the feeding connecting block (2014) is provided with a feeding opening (2015) which is communicated with the converging groove (2013) and the milling groove (209); an upper grinding disc (2010) is arranged on the top surface of the inner end of the grinding groove (209), the diameter of the upper grinding disc (2010) is smaller than that of the grinding groove (209), a feeding opening (2011) penetrating through the top end surface of the upper grinding disc (2010) is formed in the position, corresponding to the feeding opening (2015), of the bottom end surface of the upper grinding disc (2010), and the feeding opening (2011) is a round hole;
four L-shaped mounting plates (204) are arranged at the bottom end of the secondary screening shell (2) in an annular array shape, and mounting hole sites c (205) are formed in the short ends of the L-shaped mounting plates (204); an aggregate shell (3) is arranged below the secondary screening shell (2), the aggregate shell (3) is of a circular shell structure, four extension mounting plates c (302) are arranged on the outer peripheral surface of the aggregate shell (3) in a ring-shaped array shape, mounting hole sites d (303) are formed in the extension mounting plates c (302), and the mounting hole sites d (303) are fixedly connected with the mounting hole sites c (205) through bolts; a round supporting frame (301) is arranged on the bottom end surface of the aggregate shell (3); the diameter of the aggregate shell (3) is larger than that of the milling matching shell (208), an aggregate groove (304) is formed in the top end surface of the aggregate shell (3), a matching protrusion (305) is arranged at the axis position of the inner end bottom surface of the aggregate groove (304), the matching protrusion (305) is of a circular block structure, the diameter of the matching protrusion (305) is smaller than that of the milling groove (209), and at the moment, the longitudinal section of the aggregate groove (304) is of an inclined surface structure with the outer side low and the inner side high; an embedded mounting groove (307) is formed in the bottom end surface of the aggregate shell (3), and a group of motors b (308) are arranged in the embedded mounting groove (307); a lower grinding disc (306) is arranged above the matching bulge (305), and a motor b (308) penetrates through the top end surface of the matching bulge (305) and is fixedly connected with the lower grinding disc (306); when the mounting hole d (303) is fixedly connected with the mounting hole c (205) through bolts, the lower grinding disc (306) corresponds to the upper grinding disc (2010) in position, and a grinding space is reserved between the lower grinding disc and the upper grinding disc.
2. A multi-stage cereal milling and screening apparatus as claimed in claim 1, wherein: the right end face of the rectangular bulge (101) is provided with a pressing notch (105), the pressing notch (105) is of a rectangular groove structure, and the pressing notch (105) penetrates through the front end face and the rear end face of the rectangular bulge (101); a limiting insertion opening (1015) communicated with the pressing notch (105) is formed in the top end surface of the rectangular protrusion (101) relative to the pressing notch, and the limiting insertion opening (1015) is of a rectangular opening structure; the left end of the iron plate (403) is slidably arranged in the pressing notch (105), and the top end surface of the iron plate (403) is contacted with the bottom surface of the inner end of the pressing notch (105) when the insulating spring (402) is in an extending state; a plastic plugboard (503) is inserted into the limit plug opening (1015), the plastic plugboard (503) is of a rectangular plate structure, a U-shaped rotating fit protrusion (504) is arranged on the top end surface of the plastic plugboard (503), and a shaft hole (505) is formed in the axle center of the semicircular structure of the U-shaped rotating fit protrusion (504); when the bottom end surface of the plastic plugboard (503) and the bottom surface of the inner end of the pressing notch (105) are positioned at the same horizontal plane, the U-shaped rotating fit protrusion (504) is positioned outside the limiting plug-in opening (1015); the plastic plug board (503) top is equipped with a plastics shielding plate (5), and plastics shielding plate (5) are rectangular plate structure, and a normal running fit lack groove (501) has been seted up to plastics shielding plate (5) bottom face, and normal running fit lack groove (501) are rectangular groove structure, and normal running fit lack groove (501) is connected with a pivot b (502) between the inner front and back face jointly, and pivot b (502) are connected with shaft hole (505) rotation.
3. A multi-stage cereal milling screening device as claimed in claim 2, wherein: when the bottom end surface of the plastic plugboard (503) and the bottom surface of the inner end of the pressing notch (105) are positioned at the same horizontal plane, the plastic shielding plate (5) completely shields the top opening end part of the adding opening (1013); a matching block (1010) is commonly installed on the top end surfaces of the two limit posts (1011), and an abutting spring (1012) is arranged on the left end surface of the matching block (1010); when the iron plate (403) is magnetically attracted through the magnetic attraction piece (1020), the bottom end surface of the iron plate (403) is contacted with the top end surface of the primary screening shell (1), at the moment, the plastic shielding plate (5) and the plastic inserting plate (503) are both slidingly inserted into the limiting insertion opening (1015), the plastic shielding plate (5) is contacted with the left end of the pressing spring (1012), and the pressing spring (1012) is in a compressed state.
4. A multi-stage cereal milling screening device according to claim 3, wherein: an adsorption cylinder (1016) is arranged on the right side of the inner end of the primary screen groove (1017), the adsorption cylinder (1016) is a cylinder, and the front end face and the rear end face of the adsorption cylinder (1016) are fixedly connected with the front end face and the rear end face of the inner end of the primary screen groove (1017); the inner peripheral surface of the adsorption cylinder (1016) is provided with a rotary column (1021), the rotary column (1021) is a cylinder, the outer peripheral surface of the rotary column (1021) is provided with a friction layer (1022), the friction layer (1022) is an insulating fur, and the friction layer (1022) is contacted with the inner peripheral surface of the adsorption cylinder (1016); the axial center parts of the front end surface and the rear end surface of the rotary column (1021) are respectively provided with a rotary shaft a (1019), and the rotary shafts a (1019) are rotationally connected with the primary screening shell (1) through bearings; the front end face of the primary screening shell (1) is fixedly provided with a group of motors a (104), and the rotating shaft ends of the motors a (104) are fixedly connected with the rotating shaft a (1019).
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