CN114602787B

CN114602787B - Fertilizer granule screening reducing mechanism

Info

Publication number: CN114602787B
Application number: CN202210292459.8A
Authority: CN
Inventors: 何泽嘉
Original assignee: Sichuan Guowo Biotech Co ltd
Current assignee: Sichuan Guowo Biotech Co ltd
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2022-12-02
Anticipated expiration: 2042-03-24
Also published as: CN114602787A

Abstract

The utility model provides a fertilizer granule screening reducing mechanism, includes: the mounting base plate is obliquely arranged, a mounting support is arranged at the right end of the mounting base plate, and a first driving mechanism is arranged on the left side of the mounting support; the shell part is cylindrical, is internally provided with a kickoff plate and is connected with the first driving mechanism; the left end of the central screening and crushing part is connected with the left end of the shell part, the right end of the central screening and crushing part is rotatably arranged on the mounting support and comprises a central filter screen, the left end of the central filter screen is provided with a spiral guide plate extending towards the right end of the central filter screen, the outer wall of the right end of the central filter screen is provided with a second motor, the second motor is connected with a crushing piece, the central filter screen is provided with a second material returning and feeding port, and the periphery of the right end of the central filter screen is provided with a crushed material discharging port; the middle layer filtering part is arranged between the central screening and crushing part and the outer shell part and internally tangent to the central filter screen, the right end of the middle layer filtering part is connected with the mounting support, the middle layer filtering part comprises a middle layer filter screen, and the right end of the middle layer filter screen is provided with a partition plate and a first material returning feed inlet.

Description

Fertilizer granule screening reducing mechanism

Technical Field

The invention belongs to the field of organic fertilizer production, and particularly relates to an organic fertilizer particle screening and crushing device.

Background

The organic fertilizer can improve soil, increase soil fertility, improve soil nutrient vitality, change waste into valuables, clean environment, facilitate ecological environment improvement and promote agricultural sustainable development, as the modernization level of agriculture is higher and higher, organic food is more and more popular with people, the demand of the organic fertilizer is increased day by day, a plurality of manufacturers adopt a production line to carry out continuous production so as to meet the demand of an organic farm, organic fertilizer particles after granulation are dried firstly in the organic fertilizer production process, qualified particles need to be screened out after drying and cooling, screening is usually carried out twice in the screening process, oversize particles are screened out for the first time, qualified and undersize particles are left, screening is carried out for the second time, qualified particles and undersize particles are delivered out, particles meeting the demand are separated from a factory, particles with larger size and particles with smaller size are returned and crushed, the two times of screening and returned and crushed particles are finished by a plurality of processes, the production efficiency is low, if unqualified particles which are screened out in the same process are difficult to return and crush unqualified particles, and the organic fertilizer is improved.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides the organic fertilizer particle screening and crushing device, which reduces production processes, shortens the transfer time, improves the production efficiency, and is convenient for screening out unqualified organic fertilizer particles to return, crush and feed in and out.

In order to realize the purpose of the invention, the following scheme is adopted:

the utility model provides a fertilizer granule screening reducing mechanism, includes:

the mounting part comprises a mounting bottom plate which is obliquely arranged, a mounting support is arranged at the right end of the mounting bottom plate, and a first driving mechanism is arranged on the left side of the mounting support;

the shell part is cylindrical and is internally provided with a kickoff plate, the shell part is arranged on the mounting bottom plate and is connected with a first driving mechanism, and the first driving mechanism is used for driving the shell part to rotate along the axis of the shell part;

the central screening and crushing part comprises a central filter screen, the left end of the central filter screen is connected with the left end of the shell part, the right end of the central filter screen is rotatably arranged on the mounting support, the central filter screen is provided with a spiral guide plate extending towards the right end of the central filter screen, the outer wall of the right end of the central filter screen is provided with a second motor, the output end of the second motor penetrates into the central filter screen and is connected with a crushing piece, the central filter screen is provided with a second returning material feeding hole, the second returning material feeding hole is close to the right end of the central filter screen, and the periphery of the right end of the central filter screen is provided with a crushed material discharging hole;

the middle layer filtering part is arranged between the central screening and crushing part and the outer shell part, is located outside the central filtering net, is internally tangent to the central filtering net, is connected with the right end of the middle layer filtering part, comprises a middle layer filtering net, and is provided with a partition board and a first return material feeding port in a left extending manner, the first return material feeding port is located above the partition board, and the projection area of the partition board is larger than that of the second return material port.

Further, the length of the central screening and crushing part is greater than that of the middle layer filtering part, and the length of the middle layer filtering part is greater than that of the outer shell part.

Furthermore, a driving mechanism is including locating the left first motor of erection support, and the output of first motor is connected the gear, gear engagement cooperation ring gear, and the ring gear left side distributes in proper order has a plurality of ring tracks, and sets up with the ring gear is concentric, and the cooperation of ring track below is equipped with support rolls, and support rolls fixes on the mounting plate, and shell portion wears to locate in ring gear and the ring track.

Furthermore, the material shifting plate is of a telescopic structure.

Furthermore, a plurality of guide rings are arranged above the left end of the middle-layer filter screen, the guide rings are uniformly distributed from left to right, and the guide rings are arc-shaped.

Furthermore, a sealing plate is arranged outside the crushed material outlet and can be automatically reset.

Furthermore, the periphery of the central filter screen is provided with an annular guide groove matched with the guide ring.

Furthermore, a push rod for shifting the sealing plate is arranged on the mounting support.

The invention has the beneficial effects that:

1. the device adopts the multilayer filter screen, can once separate too big or undersize granule with qualified granule, reduces the screening number of times, shortens production processes, practices thrift production time, very big improvement production efficiency.

2. The device main part adopts the cylinder form, and the device main part has predetermined angle with the horizontal plane, improves the screening efficiency of fertilizer granule, is equipped with the spiral deflector in the central screening crushing portion, has increased the motion route behind the fertilizer granule entering device main part, delays fertilizer granule falling speed, can make the fertilizer granule obtain abundant screening.

3. The crushing portion back end of central screening is equipped with the second returning charge feed inlet, and outer shell portion adopts synchronous rotation with the crushing portion of central screening, corresponds the second returning charge feed inlet in the outer shell portion and is equipped with a plurality of switch boards, and when the device main part rotated, the switch board can make the fertilizer granule that falls into the undersize in the outer shell portion dial into the crushing portion rear end of central screening through the second returning charge feed inlet and smash the department.

4. The rear end of the middle layer filtering part is provided with a kickoff guide ring, the kickoff adopts a telescopic structure, and the kickoff is provided with a groove, so that the kickoff can be always attached to the outer periphery side of the rear end of the middle layer filtering part, and the material returning efficiency is improved.

5. A plurality of guide rings cooperate with a plurality of annular guide slots respectively, can restrict the axial motion of intermediate level filter house, make the inner periphery of intermediate level filter house all the time with central screening crushing unit periphery be in tangent state, the erection support is connected to intermediate level filter house rear end bottom, further restriction the swing of intermediate level filter house, make the material reversing mouth position on the intermediate level filter house remain unchanged, also improved the stability of device main part simultaneously.

Drawings

The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

Fig. 1 shows a front view of an external view of the present invention.

Fig. 2 shows an exterior perspective view of the invention.

Fig. 3 shows a bottom cross-sectional view of an external view of the present invention.

FIG. 4 shows a view of the position of the outlet of the acceptable pellets according to the present invention.

Fig. 5 shows a partial view of the invention at C of fig. 3.

Figure 6 shows an isometric view of the exterior of the central screen grinding section of the present invention.

Figure 7 shows a cross-sectional view of the central screen crushing section of the invention.

Fig. 8 shows a partial view at a of fig. 7 of the present invention.

Fig. 9 shows a partial view at B of fig. 7 of the present invention.

Figure 10 shows the internal structure of the closure plate of the present invention.

Figure 11 shows an isometric view of an intermediate layer filter of the present invention.

Figure 12 shows a cross-sectional view of an intermediate layer filter section of the present invention.

Figure 13 shows an isometric view of a shell portion of the present invention.

Figure 14 shows a cross-sectional view of the shell portion of the present invention.

FIG. 15 shows an isometric view of a stripper plate of the present invention.

Fig. 16 shows a structure of the inside of the switch plate of the present invention.

Fig. 17 shows a partial view of the invention at D of fig. 7.

The mark in the figure is: 1-mounting part, 11-annular rail, 12-supporting roller, 13-gear ring, 14-gear, 15-first motor, 16-mounting support, 161-push rod, 17-feeding hole, 18-landing leg, 19-mounting bottom plate, 2-shell part, 21-shell body, 22-material-shifting plate, 23-connecting plate, 24-first cover plate, 3-middle layer filtering part, 31-middle layer filter screen, 32-guide ring, 33-partition plate, 34-material-shifting plate guide ring, 35-second cover plate, 36-qualified particle discharging hole, 37-baffle, 38-first returned material feeding, 4-central screening crushing part, 41-central filter screen, 411-screening part, 412-mixing part, 413-crushing part, 42-spiral guide plate, 43-filter screen, 44-second motor, 45-crushing part, 46-second returned material feeding hole, 47-crushed material discharging hole, 48-closing plate and 49-annular guide groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, but the described embodiments of the present invention are a part of the embodiments of the present invention, not all of the embodiments of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the product of the present invention is conventionally placed in when in use, and are only for convenience of describing the present invention and simplifying the description. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1-17, the organic fertilizer particle screening and crushing device comprises an installation part 1, an outer shell part 2, an intermediate layer filtering part 3 and a central screening and crushing part 4. The mounting part 1 is used for supporting and mounting the device main body, the central screening and crushing part 4 is coaxially arranged with the outer shell part 2, the left ends of the central screening and crushing part 4 and the outer shell part 2 are connected, the right end of the central screening and crushing part 4 is rotatably arranged on the mounting part 1, the middle layer filtering part 3 is arranged between the central screening and crushing part 4 and the outer shell part 2, and the central screening and crushing part 4 is internally tangent to the middle layer filtering part 3, so that a qualified product cavity is formed below the outer periphery of the central screening and crushing part 4 and below the inner periphery of the middle layer filtering part 2, the cavity space of the qualified product cavity is large, organic fertilizer particles with qualified sizes and organic fertilizer particles smaller than the qualified sizes fall into the qualified product cavity to have inertia, and meanwhile, the qualified product cavity is continuously moved downwards along the qualified product cavity under the action of gravity, meanwhile, the qualified product cavity also provides sufficient movement space for the movement of the qualified product cavity, and the sieving is more sufficient; the installation department 1 is connected to 3 right-hand members of intermediate level filtering part, and the left end butt is in outer shell portion 2, and the length of central screening crushing portion 4 is greater than the length of intermediate level filtering part 3, and the length of intermediate level filtering part 3 is greater than the length of outer shell portion 2. The filtering holes on the central screening and crushing part 4 are larger than those on the middle layer filtering part 3.

Specifically, the mounting portion 1 includes two sets of circular rails 11, four sets of supporting rollers 12, a mounting support 16, a feed inlet 17, a plurality of supporting legs 18, and a mounting bottom plate 19. The supporting legs 18 are respectively arranged at the bottom of the mounting plate 11 and used for supporting the device body, the supporting legs 18 are obliquely provided with mounting bottom plates 19, so that the length of the supporting leg on the left side is larger than that of the supporting leg on the right side, the mounting bottom plates 19 are provided with first driving mechanisms, each first driving mechanism comprises a gear 13, a gear ring 14 and a first motor 15, the output end of each first motor 15 is connected with the gear 14, the gears 14 are meshed with the gear rings 13, and the gear rings 13 are fixed on the shell part 2 and are close to the right end of the shell part 2; two groups of annular rails 11 are arranged on the left side of the gear ring 13, a preset distance is reserved between the two groups of annular rails 11, the annular rails 11 are fixedly arranged on the outer shell part 2, the annular rails 11 and the gear ring 13 are concentric and parallel, and the gear ring 13 and the two groups of annular rails 11 are sequentially distributed on the periphery of the outer shell part 2 from right to left; circular track 11 cooperates with the support rolls 12 who sets up on mounting plate 19 respectively, make a circular track 11 set two support rolls 12 respectively, support rolls 12 week side middle part is equipped with to the inside sunken recess of support rolls 12, make circular track 11 card locate in the recess, can effectively restrict the axial displacement of device main part, feed inlet 17 is located device main part left end, be used for receiving to wait to sieve the fertilizer granule, erection support 16 locates first motor 15 right side and has the interval with first motor, 16 right flank of erection support is equipped with push rod 161.

Specifically, the shell 2 includes a shell 21, a plurality of material-shifting plates 22, a connecting plate 23, and a first cover plate 24; the outer shell 21 is cylindrical and penetrates through the annular track 11 and the gear ring 13, the left end of the outer shell 21 is provided with a connecting plate 23, the connecting plate 23 and the outer shell 21 are concentrically arranged, the middle of the connecting plate 23 is provided with a hole matched with the left end of the central screening and crushing part 4, the outer ring of the connecting plate 23 is locked on the outer shell 21 through a screw, the inner ring of the connecting plate 23 is locked at the left end of the central screening and crushing part 4 through a screw, so that the central screening and crushing part 4 and the outer shell 21 are connected together and can synchronously move; a first cover plate 24 is arranged at the right end of the outer shell 21, an eccentric hole matched with the periphery of the middle layer filtering part 3 is formed in the middle of the first cover plate 24, and therefore when the outer shell 2 rotates, the relative movement between the first cover plate 24 and the periphery of the middle layer filtering part 3 is smooth; switch-plate 22 locates in the shell body 21 and along the interior week evenly distributed of shell body 21, switch-plate 22 right-hand member butt extends predetermined length in first apron 24 and along shell body 21 axis left, switch-plate 22 is extending structure, when making shell portion 2 rotate, switch-plate 22 laminating intermediate level filter house 3's periphery, can make the undersize fertilizer granule that drops into the shell body 21 right-hand member carry out in being brought into central screening crushing portion 4 along with shell body 21's rotation by switch-plate 22, carry out the returning charge and smash, thereby do not need other conveyer to carry out the returning charge and collect and the transportation of returning charge, very big improvement the efficiency of returning charge.

Specifically, the switch 22 includes a switch mounting seat 221, a plurality of elastic members 222, an expansion plate 223, and a switch guide groove 224. The middle of the switch plate mounting seat 221 is provided with a groove recessed towards the interior of the switch plate mounting seat 221 along the length direction, a plurality of elastic elements 222 are arranged in the groove, and the other end of each elastic element 222 is connected with a telescopic plate 223.

Specifically, the middle layer filtering part 3 includes a middle layer filter screen 31, two guide rings 32, a material shifting plate guide ring 34, a second cover plate 35, a qualified particle discharge port 36, a baffle 37, and a first material returning feed port 38. The middle layer filter screen 31 is positioned outside the central filter screen 41 and internally tangent to the central filter screen 41, and a plurality of first filter holes 310 are formed in the upper edge of the middle layer filter screen 31; the two guide rings 32 are arranged inside the middle layer filter screen 31 close to the left end, are sequentially distributed at intervals from left to right and are clamped on the periphery of the central screening and crushing part 4 to limit the axial movement of the middle layer filter screen 31 and increase the connection strength; the first material returning feed inlet 38 is arranged on the uppermost edge line of the middle layer filter screen 31 and is close to the right end of the middle layer filter screen 31; the second cover plate 35 is arranged at the right end of the middle layer filter screen 31 and is provided with an eccentric round hole, and the eccentric round hole is matched with the periphery of the central screening and crushing part 4, so that the central screening and crushing part 4 can smoothly rotate; the baffle 37 extends towards the left end of the middle layer filter screen 31 along the edge of the eccentric circular hole, so that the projection area of the baffle 37 completely covers the projection area of the first material returning and feeding hole 38; the switch plate guide ring 34 is arranged on the outer periphery of the first material returning inlet 38 and is matched with the switch plate guide groove 224, so that the switch plate 22 can move along the switch plate guide ring 34, and the stretching stability of the switch plate 22 is improved.

Specifically, guide ring 32 is located intermediate level filter screen 31 top, is not sealed arc, avoids guide ring 32 and intermediate level filter screen 31 junction to block the motion of fertilizer granule, avoids the fertilizer granule to fall into qualified product intracavity back, is detained in guide ring 32 and intermediate level filter screen 32's junction can't fall out qualified product chamber completely.

Specifically, the central screen pulverizing part 4 includes a central filter screen 41, a spiral guide plate 42, a filter screen 43, a second motor 44, a pulverizing member 45, a second returning material inlet 46, a pulverized material outlet 47, a sealing plate 48, and an annular guide groove 49. The central filter screen 41 is cylindrical, left opened and right closed, the right end of the central filter screen 41 is locked on the connecting plate 23 through a plurality of screws along the circumferential direction, the left end is rotatably arranged on the mounting support 16, and the spiral guide plate 42 is arranged at the position close to the left end inside the central filter screen 41 and used for delaying the descending speed of organic fertilizer particles and increasing the motion path of the organic fertilizer particles, so that the organic fertilizer particles entering the central filter screen 41 are fully screened; a second motor 43 is arranged at the right end of the central filter screen 41, the output end of the second motor 43 penetrates through the right end of the central filter screen 41 and is connected with a crushing piece 45, a second returning material inlet 46 is arranged on the central filter screen 41 and is close to the right end of the central filter screen 41, the second returning material inlet 46 is arranged corresponding to the first returning material inlet 38, the length of the second returning material inlet 46 along the axial direction is smaller than that of the baffle 33, so that the projection size of the second returning material inlet 46 falls into the size range of the baffle 33, when the second returning material inlet 46 rotates to the position above the first returning material inlet 38, the outer shell 21 is communicated with a crushing area at the right end of the central filter screen 41, and at the moment, the shifting plate 22 can put organic fertilizer particles with undersize into the crushing area for crushing; when the second returning material feeding hole 46 is rotated away from the returning material feeding position, the baffle 33 can seal the second returning material feeding hole 46, so that the returning organic fertilizer in the crushing area can not fall into the qualified product cavity, and the returning organic fertilizer and the qualified organic fertilizer particles are effectively isolated; a filter screen 43 is arranged between the crushing piece 45 and the right end of the central filter screen 41, the filter screen 43 and the bottom of the left end of the central filter screen 41 form a crushed material temporary storage cavity, and the filter screen 43 and the bottom of the right end form a crushed material temporary storage cavity, so that crushed organic fertilizer crushed materials can enter the crushed material temporary storage cavity after being completely crushed, organic fertilizer particles which are not crushed can be prevented from entering the crushed material temporary storage cavity, the quality of returned materials is influenced, and the noise pollution generated by crushing can be effectively reduced by completing the crushing of the returned organic fertilizer in the cavity of the device main body; the periphery of the temporary storage cavity of the crushed material is provided with a crushed material outlet 47 communicated with the temporary storage cavity of the crushed material, the periphery of the crushed material outlet 47 is provided with a sealing plate 48, the sealing plate 48 has an automatic resetting function, and the sealing plate 48 can be opened at a specified position to discharge the crushed material.

Specifically, the central filter screen 41 is sequentially divided into a filtering area 411, an intersecting area 412 and a crushing area 413 from left to right along the dotted line in fig. 7, a plurality of second filtering holes 410 are formed in the filtering area 411, the second filtering holes 410 extend to the middle lower part of the central filter screen 41, and the second filtering holes 410 are larger than the first filtering holes 310; spiral guide plate 42 extends to the bottom of mixing area 412 from the filtering area, because the crushing piece 45 who smashes the district 413 bottom rotates kibbling speed very fast, and part exists by the kibbling fertilizer particulate matter and is popped out to the possibility of handing-over region 412, and spiral guide plate 42 can lead the fertilizer particulate matter of handing-over region once more and return into crushing district this moment, and the effectual fertilizer granule that prevents after smashing gets into to cross filters to filter 411 in, avoids being gone into qualified product chamber by damaged irregular fertilizer granule, influences the quality of qualified product.

Concretely, smash thing discharge gate 47 and be equipped with the spout outward, shrouding 48 sliding fit is in the spout, shrouding 48 includes arc 481, slider 482, spring 483's one end fixed connection spout one side, slider 482 is connected to the other end, slider 482 is connected to arc 481, arc 481's radian and the 47 phase-matches of crushing thing discharge gate, make arc 481 smoothly slide and can realize opening smoothly of crushing thing discharge gate 47 under the exogenic action along the spout, external force disappears after automatic re-setting, avoid the device main part to rotate the in-process and have the crushing thing to spill the crushing thing and keep in the chamber. When shrouding 48 rotated the below ejection of compact position, locating push rod 161 on erection support 16 and can push open shrouding 48, made the ejection of compact of smashing the thing, after leaving the ejection of compact position, shrouding 48 utilized spring 483 automatic re-setting to seal smashing thing discharge gate 47, and the effectual condition that prevents to rotate the outer hourglass of in-process smashing thing appears.

The specific implementation mode is as follows: starting a first motor 15, so that a gear ring 13 is driven by a driving gear 14 to rotate, so that a central screening and crushing part 3 is driven by an outer shell part 2 to synchronously rotate, organic fertilizer particles enter a screening area 411 of the central screening and crushing part 4 through a feed port 17, under the rotation of a device main body, a spiral guide plate 42 slowly guides materials to the device main body, the organic fertilizer particles slowly pass through a screening area along the spiral guide plate 42 to be screened, at the moment, the oversize organic fertilizer particles enter a crushing area 413 to be crushed, the qualified organic fertilizer particles enter a qualified product cavity through a second screening hole 410, then fall out from a qualified particle discharge port 36 at the bottom of the right end of the qualified product cavity, and the undersize organic fertilizer particles pass through the qualified cavity and enter the bottom of the right end of the outer shell body 21 through a first screening hole 310; through the rotation of device main part, switch board 22 in the shell body 2 brings the fertilizer granule of size undersize into device main part top, and second returning charge feed inlet 46 is just to first returning charge feed inlet 38 this moment, and the fertilizer granule of size undersize falls into crushing district 413 through first returning charge feed inlet 38 and second returning charge feed inlet 46, treats that the returning charge fertilizer smashes the back up to standard, and the crushing thing gets into the crushing thing intracavity of keeping in, and the crushing thing discharge gate 47 of the chamber is kept in to the rethread crushing thing falls out.

The foregoing is only a preferred embodiment of the present invention and is not intended to be exhaustive or to limit the invention. It should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention as defined by the claims below.

Claims

1. The utility model provides a fertilizer granule screening reducing mechanism which characterized in that includes:

the mounting part (1) comprises a mounting bottom plate (19) which is obliquely arranged, a mounting support (16) is arranged at the right end of the mounting bottom plate (19), and a first driving mechanism is arranged on the left side of the mounting support (16);

the shell part (2) is cylindrical, a material stirring plate (22) is arranged in the shell part, the shell part (2) is arranged on the mounting bottom plate (19) and is connected with a first driving mechanism, and the first driving mechanism is used for driving the shell part (2) to rotate along the axis of the shell part;

the central screening and crushing part (4) is connected with the left end of the outer shell part (2) at the left end, the right end is rotatably arranged on the mounting support (16) and comprises a central filter screen (41), a spiral guide plate (42) extending towards the right end of the central filter screen (41) is arranged at the left end of the central filter screen, a second motor (44) is arranged on the outer wall of the right end of the central filter screen (41), the output end of the second motor (44) penetrates through the central filter screen (41) and is connected with a crushing piece (45), a second material returning and feeding hole (46) is formed in the central filter screen (41), the second material returning and feeding hole (46) is close to the right end of the central filter screen (41), and a crushed material discharging hole (47) is formed in the periphery of the right end of the central filter screen (41);

middle level filter house (3), locate between central screening crushing portion (4) and shell portion (2), be located outside central filter screen (41), and with central filter screen (41) inscribe, middle level filter house (3), erection support (16) are connected to the right-hand member, middle level filter house (3) are including middle level filter screen (31), the right-hand member extends left and is equipped with baffle (33) and first returning charge feed inlet (38), be located baffle (33) top, the projection area of baffle (33) is greater than the projection area of second returning charge feed inlet (46).

2. The organic fertilizer particle screening and crushing device is characterized in that the length of the central screening and crushing part (4) is larger than that of the middle layer filtering part (3), the length of the middle layer filtering part (3) is larger than that of the outer shell part (2), and the second screening holes (410) in the central screening and crushing part (4) are larger than the first screening holes (310) in the middle layer filtering part (3).

3. The organic fertilizer particle screening and crushing device according to claim 1, wherein the first driving mechanism comprises a first motor (15) arranged on the left side of the mounting support (16), the output end of the first motor (15) is connected with a gear (14), the gear (14) is meshed with a gear ring (13), a plurality of annular tracks (11) are sequentially distributed on the left side of the gear ring (13) and are concentrically arranged with the gear ring (13), supporting rollers (12) are arranged below the annular tracks (11) in a matching manner, the supporting rollers (12) are fixedly arranged on the mounting bottom plate (19), and the shell part (2) penetrates through the gear ring (13) and the annular tracks (11).

4. The organic fertilizer particle screening and crushing device as claimed in claim 1, wherein the material shifting plate (22) is of a telescopic structure.

5. The organic fertilizer particle screening and crushing device as claimed in claim 1, wherein a plurality of guide rings (32) are arranged above the left end of the middle layer filter screen (31), the guide rings (32) are uniformly distributed from left to right, and the guide rings (32) are arc-shaped.

6. The organic fertilizer particle screening and crushing device as claimed in claim 1, wherein a sealing plate (48) is arranged outside the crushed material outlet (47), and the sealing plate (48) can be automatically reset.

7. The organic fertilizer particle screening and crushing device as claimed in claim 5, wherein the central filter screen (41) is provided with an annular guide groove (49) matched with the guide ring (32) on the periphery.

8. The organic fertilizer particle screening and crushing device as claimed in claim 6, wherein a push rod (161) for shifting the sealing plate (48) is arranged on the mounting support (16).