CN210632425U

CN210632425U - Agricultural seed sieving mechanism based on rock screening and combined flotation

Info

Publication number: CN210632425U
Application number: CN201920789339.2U
Authority: CN
Inventors: 范甬挺
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-05-29
Anticipated expiration: 2029-05-29

Abstract

The utility model discloses an agricultural seed sieving mechanism based on rock screening and combination flotation relates to agricultural seed screening technical field. This agricultural seed sieving mechanism based on rock screening and parallel flotation, which comprises a bod, the top of organism is pegged graft and is had the feed inlet, and the bottom of feed inlet run through the inner wall top of organism and communicate with the inner chamber of organism, the below of feed inlet is provided with the screening case, and the left and right sides of screening case all is provided with rocking mechanism, the left and right sides of screening incasement wall is crisscross to be provided with the sieve, and has all seted up logical groove on two sieves. This agricultural seed sieving mechanism based on rock screening and combination flotation rocks the mechanism through setting up to can effectively drive the screening case and rock from top to bottom, through set up the water tank in screening case below, and make unrestrained pump, bin outlet and dump bin's cooperation setting, solved among the prior art seed sieve separator screening basis comparatively single lead to screening quality lower problem.

Description

Agricultural seed sieving mechanism based on rock screening and combined flotation

Technical Field

The utility model relates to an agricultural seed screening technical field specifically is an agricultural seed sieving mechanism based on rock screening and parallel flotation.

Background

In modern agriculture, a seed screening machine becomes indispensable equipment, so that the labor input is reduced, and the agricultural production efficiency is effectively improved.

Because the seed is not of uniform size and quality differs at the seed screening in-process to lead to current seed sieve separator can't realize effectual multistage screening work, influenced the screening quality of seed to a certain extent, for example chinese patent authorizes bulletin number: CN 206509223U's an agricultural technology promotes uses seed screening machine, including feeding roller, dust exhausting fan, first screening plant, second screening plant, one-level discharge gate and second grade discharge gate, solved the seed and piled up the problem that leads to the top seed can't be sieved together, nevertheless because the quality of inferior seed is lighter, this screening machine is obvious as the drawback of screening the basis only through the particle diameter.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides an agricultural seed sieving mechanism based on rock screening and combination flotation has solved the seed because size and quality differ, and current seed sieve separator leads to the lower problem of screening quality as the screening foundation with the particle diameter.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: an agricultural seed screening device based on shaking screening and combined flotation comprises a machine body, wherein a feed inlet is inserted into the top of the machine body, the bottom of the feed inlet penetrates through the top of the inner wall of the machine body and is communicated with the inner cavity of the machine body, a screening box is arranged below the feed inlet, and shaking mechanisms are arranged on the left side and the right side of the screening box; the screening box comprises a screening box body, screening plates, a guide plate, guide plates and guide plates, wherein the screening plates are arranged on the left side and the right side of the inner wall of the screening box in a staggered mode, through grooves are formed in the two screening plates, the upper side and the lower side of each through groove penetrate through the upper side and the lower side of each screening plate respectively, the screen meshes are embedded in the through grooves, the guide plates are arranged below the screen meshes, the tops of the guide plates are fixedly connected to the bottoms of the screening plates, poor-quality material guide pipes are arranged below one sides, away from the screening plates, of the guide plates, the poor-quality material guide pipes are fixedly connected to the inner wall of the screening; the screening box is characterized in that two supporting springback mechanisms are arranged below the screening box, the two supporting springback mechanisms are respectively fixedly mounted on the front side and the rear side of the inner wall of the machine body, a water tank is arranged below the screening box, a blanking gap is reserved on the periphery of the supporting springback mechanisms, the blanking gap corresponds to the communicated water tank, the bottom of the water tank is in sliding connection with the inner bottom of the machine body, a wave making pump is arranged at the top of the right wall in the water tank, a discharge hole is formed in the top of the left wall in the water tank relative to the wave making pump, the discharge hole penetrates through the left side of the water tank, a waste box is arranged on the left side of the discharge hole, the right side of the waste box is fixedly connected with the left side of the water tank, a water inlet pipe is inserted into the front of the machine body, the rear, and the front side and the rear side of the machine door respectively penetrate through the inner side and the outer side of the front side of the machine body.

Preferably, the shaking mechanism comprises a speed reducing motor, a rotating shaft, an eccentric wheel, a pulley fixing piece, a sliding rod, a connecting block and a lantern ring, the speed reducing motor is fixedly arranged at the top of the right side of the machine body, an output shaft of the reducing motor is fixedly connected with one end of a rotating shaft through a coupler, one end of the rotating shaft, which is opposite to the output shaft of the reducing motor, is fixedly connected with an eccentric wheel, the bottom of the eccentric wheel is connected with the top of the pulley in a sliding way, the left end and the right end of the pulley are respectively movably connected with the left side and the right side of the inner wall of the pulley fixing piece, the bottom of the pulley fixing piece is fixedly connected with a sliding rod, the upper side and the lower side of one side of the sliding rod are both fixedly connected with connecting blocks, and two connecting blocks back to back the same side equal fixed connection of slide bar on the lateral wall of screening case, the bottom of slide bar and the inner circle sliding connection of the lantern ring, and lantern ring fixed connection is on the rear side of organism inner wall.

Preferably, the supporting resilience mechanism comprises a fixed plate, a return spring, a supporting plate, a fixed sleeve, a fixed rod, a guide sliding strip and a guide sliding groove, the rear side of the fixed plate is fixedly connected to the rear side of the inner wall of the machine body, and the inner bottom of the fixed plate is fixedly connected with a return spring, the top end of the return spring is fixedly connected with the bottom of the supporting plate, and one side of the supporting plate, which is back to the reset spring, is fixedly connected with the bottom of the screening box, the inner bottom of the fixed plate is fixedly connected with a fixed sleeve, and a fixed rod is sleeved in the fixed sleeve, the top end of the fixed rod penetrates through the top of the fixed plate and is fixedly connected with the bottom of the supporting plate, the front side and the rear side of the fixed rod are both fixedly connected with guide sliding strips, the front side and the rear side of the inner wall of the fixed sleeve are both provided with guide sliding grooves, and one side of the inner wall of each of the two guide sliding grooves, which is opposite to the inner wall of each of the two guide sliding grooves, is slidably connected with one side of the fixing rod, which is opposite to the two guide sliding strips, in a back-to-back manner.

Preferably, the position of the side surface of the eccentric wheel deviating from the circle center is fixedly connected with the rotating shaft, and a distance is kept between one side of the eccentric wheel, which is opposite to the rotating shaft, and the side wall of the screening box.

Preferably, the pulley passes through round pin axle swing joint in the pulley mounting, and the both sides of pulley all leave the clearance with the left and right sides of pulley mounting inner wall between.

Preferably, the sieve plate is inclined relative to the bottom of the screening box, and a triangle is formed between the sieve plate and the guide plate.

Preferably, the elastic force of the return spring is greater than the self weight of the support plate, and a gap is left between the side surface of the return spring and the inner wall of the fixing plate.

Preferably, the left side and the right side of water tank respectively with one side sliding connection relatively of two limiting plates, and the equal fixed connection in bottom in the organism of bottom of two limiting plates.

The utility model provides an agricultural seed sieving mechanism based on rock screening and combine flotation. The method has the following beneficial effects:

(1) this agricultural seed sieving mechanism based on rock screening and parallel combination flotation rocks the mechanism through setting up to can effectively drive the screening case and rock from top to bottom, can effectively sieve out the less seed of particle diameter through the cooperation setting of sieve, logical groove and screen cloth simultaneously, set up through the cooperation that supports springback mechanism and can effectively support and stabilize the rocking from top to bottom of screening case.

(2) This agricultural seed sieving mechanism based on rock screening and combination flotation, through setting up the water tank in screening case below, and make unrestrained pump, the cooperation setting of bin outlet and dump bin, thereby can make the lower seed of quality float in the surface of water, and discharge the seed via the bin outlet in the dump bin through the water wave that makes unrestrained pump function production, thereby guaranteed that the device synthesizes particle diameter and quality as the screening effect of screening foundation to the seed, solved among the prior art seed sieve separator screening foundation comparatively single lead to screening quality lower problem.

(3) This agricultural seed sieving mechanism based on rock screening and parallel combination flotation through set up fixed cover in the fixed plate to and the cooperation setting of dead lever, thereby can effective stabilizing support board reciprocate, set up through the cooperation of leading the draw runner and leading the spout simultaneously and can effectively avoid the dead lever to appear the condition of deviating from in the fixed cover under reset spring effort.

(4) This agricultural seed sieving mechanism based on rock screening and parallel flotation sets up the baffle through setting up in the sieve below to and the cooperation setting of inferior quality material pipe, thereby can be effectively collect the inferior quality seed of screen cloth sifting to in the inferior quality material pipe, and discharge inferior quality seed from the organism through the deflector, effectively guaranteed the device's screening effect.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front view of the present invention;

fig. 3 is a sectional view of the support resilient mechanism of the present invention;

FIG. 4 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

fig. 5 is an enlarged view of the structure at B in fig. 1 according to the present invention.

In the figure: 1 machine body, 2 feed inlets, 3 screening boxes, 4 shaking mechanisms, 5 sieve plates, 6 through grooves, 7 screens, 8 guide plates, 9 poor-quality material guide pipes, 10 guide plates, 11 supporting springback mechanisms, 12 water tanks, 13 wave-making pumps, 14 discharge ports, 15 waste material boxes, 16 water inlet pipes, 17 machine doors, 41 speed-reducing motors, 42 rotating shafts, 43 eccentric wheels, 44 pulleys, 45 pulley fixing pieces, 46 sliding rods, 47 connecting blocks, 48 lantern rings, 111 fixing plates, 112 reset springs, 113 supporting plates, 114 fixing sleeves, 115 fixing rods, 116 sliding guide strips and 117 sliding guide grooves.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides an agricultural seed sieving mechanism based on rock screening and parallel flotation, includes organism 1, and it has feed inlet 2 to peg graft at the top of organism 1, and the bottom of feed inlet 2 run through the inner wall top of organism 1 and communicate with the inner chamber of organism 1, and the below of feed inlet 2 is provided with screening case 3, and the left and right sides of screening case 3 all is provided with rocks mechanism 4.

The left side and the right side of the inner wall of the screening box 3 are provided with the screen plates 5 in a staggered manner, the two screen plates 5 are both provided with the through grooves 6, the upper side and the lower side of each through groove 6 respectively penetrate through the upper side and the lower side of each screen plate 5, the screen cloth 7 is embedded in each through groove 6, the guide plate 8 is arranged below the screen cloth 7, the top of each guide plate 8 is fixedly connected to the bottom of each screen plate 5, each screen plate 5 is inclined relative to the bottom of the screening box 3, a triangle is formed between each screen plate 5 and each guide plate 8, the guide plates 8 can effectively discharge materials screened by the screen cloth 7, the seed screening efficiency of the device is effectively ensured, the lower parts of the guide plates 8, which are far away from one side of each screen plate 5, are provided with the inferior material guide pipes 9, the inferior material guide pipes 9 are fixedly connected to the inner wall of the screening box 3, the bottom ends of the two inferior material, two derivation boards 10 alternate respectively in the left and right sides of organism 1, through set up baffle 8 below sieve 5 to and the cooperation setting of material pipe 9 of being inferior, thereby can be effectively collect the inferior quality seed of 7 screenings of screen cloth to material pipe 9 of being inferior, and discharge the inferior quality seed from organism 1 in through derivation board 10, effectively guaranteed the device's screening effect.

Two supporting springback mechanisms 11 are arranged below the screening box 3, the two supporting springback mechanisms 11 are respectively and fixedly installed on the front side and the rear side of the inner wall of the machine body 1, blanking gaps are reserved on the peripheries of the supporting springback mechanisms 11 and correspondingly communicated with the water tank 12, the bottom of the water tank 12 is in sliding connection with the inner bottom of the machine body 1, the screening box 3 can be effectively driven to rock up and down by arranging the rocking mechanism 4, seeds with smaller particle sizes can be effectively screened out by matching the sieve plate 5, the through groove 6 and the screen 7, the up-and-down rocking of the screening box 3 can be effectively supported and stabilized by matching the supporting springback mechanisms 11, the water tank 12 is arranged below the screening box 3, the bottom of the water tank 12 is in sliding connection with the inner bottom of the machine body 1, the left side and the right side of the water tank 12 are respectively in sliding connection with one opposite side of the two limiting plates, and the, the position of the water tank 12 in the machine body 1 can be effectively limited by arranging the limiting plate, so that the normal use of the water tank 12 can be effectively ensured, the wave making pump 13 is arranged at the top of the right wall in the water tank 12, the discharge opening 14 is formed in the position, opposite to the wave making pump 13, of the top of the left wall in the water tank 12, the discharge opening 14 penetrates through the left side of the water tank 12, the waste tank 15 is arranged on the left side of the discharge opening 14, the water tank 12 is arranged below the screening tank 3, the wave making pump 13, the discharge opening 14 and the waste tank 15 are arranged in a matched mode, so that seeds with lower quality can float on the water surface, the seeds are discharged into the waste tank 15 through the discharge opening 14 through water waves generated by the operation of the wave making pump 13, the screening effect of the comprehensive particle size and quality of the device on the seeds as screening basis is ensured, and the problem that the screening basis of the seed screening machine in, the right side of waste bin 15 and the left side fixed connection of water tank 12, and the front of organism 1 alternates there is inlet tube 16, the rear end of inlet tube 16 extends to the top of water tank 12, and the place ahead of water tank 12 is provided with door 17, door 17 articulates in the front of organism 1, and the front and back both sides of door 17 run through the positive inside and outside both sides of organism 1 respectively, the door 17 is embedded to have the observation window, thereby convenient to use person looks over the water yield in the water tank 12 through setting up the observation window, the device's convenience in use has effectively been improved.

The shaking mechanism 4 comprises a speed reducing motor 41, a rotating shaft 42, an eccentric wheel 43, a pulley 44, a pulley fixing piece 45, a sliding rod 46, a connecting block 47 and a lantern ring 48, wherein the speed reducing motor 41 is fixedly arranged at the top of the right side of the machine body 1, an output shaft of the speed reducing motor 41 is fixedly connected with one end of the rotating shaft 42 through a coupler, one end of the rotating shaft 42, which is opposite to the output shaft of the speed reducing motor 41, is fixedly connected with the eccentric wheel 43, the bottom of the eccentric wheel 43 is slidably connected with the top of the pulley 44, the position, deviating from the center of circle, of the side surface of the eccentric wheel 43 is fixedly connected with the rotating shaft 42, and the side surface, which is opposite to the rotating shaft 42, of the eccentric wheel 43 is kept at a distance from the side wall of the screening box 3, so that the pulley 44 can be pushed to move when the, the bottom of the pulley fixing piece 45 is fixedly connected with a sliding rod 46, the pulley 44 is movably connected in the pulley fixing piece 45 through a pin shaft, and gaps are left between the two sides of the pulley 44 and the left and right sides of the inner wall of the pulley fixing piece 45, so that the normal rotation of the pulley 44 can be effectively ensured through the structural design, meanwhile, the friction between the pulley 44 and the pulley fixing member 45 can be avoided, the upper and lower sides of one side of the sliding rod 46 are fixedly connected with connecting blocks 47, and one side of the two connecting blocks 47 opposite to the sliding rod 46 is fixedly connected on the side wall of the screening box 3, the bottom end of the sliding rod 46 is connected with the inner ring of the lantern ring 48 in a sliding way, the lantern ring 48 is fixedly connected on the rear side of the inner wall of the machine body 1, thereby can effectively stabilize the upper and lower slip of slide bar 46 through setting up lantern ring 48, can drive screening case 3 through connecting block 47 and rock from top to bottom simultaneously.

The supporting and rebounding mechanism 11 includes a fixing plate 111, a return spring 112, a supporting plate 113, a fixing sleeve 114, a fixing rod 115, a guiding sliding strip 116 and a guiding sliding groove 117, the rear side of the fixing plate 111 is fixedly connected to the rear side of the inner wall of the machine body 1, the inner bottom of the fixing plate 111 is fixedly connected with the return spring 112, the top end of the return spring 112 is fixedly connected to the bottom of the supporting plate 113, one side of the supporting plate 113 opposite to the return spring 112 is fixedly connected to the bottom of the screening box 3, the elastic force of the return spring 112 is greater than the self weight of the supporting plate 113, and a gap is left between the side surface of the return spring 112 and the inner wall of the fixing plate 111, by means of the structural design, the pushing effect of the return spring 112 on the supporting plate 113 can be effectively guaranteed, meanwhile, the return spring 112 can have a certain deformation space in the fixing plate, the top of dead lever 115 runs through the top of fixed plate 111 and with the bottom fixed connection of backup pad 113, and the equal fixedly connected with in both sides leads draw runner 116 around dead lever 115, the spout 117 has all been seted up to the front and back both sides of fixed cover 114 inner wall, and two one sides that lead the relative one side of spout 117 inner wall respectively with two one side sliding connection that lead draw runner 116 back of the body dead lever 115, through set up fixed cover 114 in fixed plate 111, and the cooperation setting of dead lever 115, thereby can effectively stabilize reciprocating of backup pad 113, the condition of deviating from in fixed cover 114 can effectively be avoided in dead lever 115 to the cooperation setting through leading draw runner 116 and spout 117 simultaneously.

When the agricultural seed screening device based on shaking screening and combined flotation works, seeds are guided into the screening box 3 through the feeding port 2, the speed reduction motor 41 operates to drive the rotating shaft 42 to rotate, the eccentric wheel 43 rotates and pushes the pulley 44, the pulley fixing piece 45 drives the sliding rod 46 to slide in the lantern ring 48, the screening box 3 is driven to shake up and down through the connecting block 47, the screen 7 screens the seeds with smaller particle size onto the guide plate 8 through the through groove 6, the seeds are discharged onto the guide plate 10 and out of the machine body 1 through the poor material conduit 9, the reset spring 112 is pressed through the supporting plate 113, the supporting plate 113 moves up and down in the fixing sleeve 114 through the fixing rod 115, water is injected into the water tank 12 through the water inlet pipe 16, the seeds with lighter weight float to the water meter, the seeds of the water meter are discharged into the waste material box 15 through the discharging port 14 through the operation of the wave making pump 13, the water tank 12 is taken out for disposal by opening the door 17.

To sum up, can obtain, this agricultural seed sieving mechanism based on rock screening and combine flotation through set up baffle 8 in sieve 5 below to and the cooperation setting of inferior quality material pipe 9, thereby effectively collect the inferior quality seed that 7 sieves out of screen cloth to inferior quality material pipe 9 in, and discharge inferior quality seed from organism 1 in through leading out board 10, effectively guaranteed the device's screening effect.

Simultaneously, rock mechanism 4 through setting up to effectively drive screening case 3 and rock from top to bottom, set up the less seed of effective screening particle diameter through sieve 5, the cooperation that leads to groove 6 and screen cloth 7 simultaneously, set up through the cooperation that supports resilience mechanism 11 and effectively support and stabilize shaking from top to bottom of screening case 3.

Simultaneously, through setting up water tank 12 in screening case 3 below to and make unrestrained pump 13, bin outlet 14 and waste bin 15's cooperation setting, thereby make the lower seed of quality float in the surface of water, and through making in unrestrained pump 13 function produced the water wave discharges the seed via bin outlet 14 into waste bin 15, guaranteed the device synthesize the particle diameter and the quality as the screening effect of screening foundation to the seed, solved among the prior art seed screening machine screening foundation comparatively single lead to screening quality lower problem.

Meanwhile, the fixing sleeve 114 is arranged in the fixing plate 111, and the fixing rod 115 is arranged in a matching manner, so that the up-and-down movement of the supporting plate 113 is effectively stabilized, and the fixing rod 115 is effectively prevented from being disengaged from the fixing sleeve 114 under the action of the return spring 112 by the matching arrangement of the guide sliding strip 116 and the guide sliding groove 117.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides an agricultural seed sieving mechanism based on rock screening and combine flotation, includes organism (1), its characterized in that: the top of the machine body (1) is inserted with a feed port (2), the bottom of the feed port (2) penetrates through the top of the inner wall of the machine body (1) and is communicated with the inner cavity of the machine body (1), a screening box (3) is arranged below the feed port (2), and shaking mechanisms (4) are arranged on the left side and the right side of the screening box (3);

the left side and the right side of the inner wall of the screening box (3) are provided with screen plates (5) in a staggered way, and the two screen plates (5) are both provided with through grooves (6), the upper side and the lower side of the through groove (6) respectively penetrate through the upper side and the lower side of the sieve plate (5), a screen (7) is embedded in the through groove (6), a guide plate (8) is arranged below the screen (7), the top of the guide plate (8) is fixedly connected with the bottom of the sieve plate (5), an inferior material guide pipe (9) is arranged below one side of the guide plate (8) far away from the sieve plate (5), the inferior material guide pipes (9) are fixedly connected on the inner wall of the screening box (3), the bottom ends of the two inferior material guide pipes (9) extend to the lower part of the screening box (3), guide plates (10) are arranged below the two poor-quality material guide pipes (9), and the two guide plates (10) are respectively inserted into the left side and the right side of the machine body (1);

the screening box is characterized in that two supporting springback mechanisms (11) are arranged below the screening box (3), the two supporting springback mechanisms (11) are respectively fixedly installed on the front side and the rear side of the inner wall of the machine body (1), a water tank (12) is arranged below the screening box (3), a blanking gap is reserved on the periphery of each supporting springback mechanism (11), the blanking gap corresponds to a communicated water tank (12), the bottom of the water tank (12) is in sliding connection with the inner bottom of the machine body (1), a wave making pump (13) is arranged at the top of the inner right wall of the water tank (12), a discharge hole (14) is formed in the position, corresponding to the wave making pump (13), of the top of the inner left wall of the water tank (12), the discharge hole (14) penetrates through the left side of the water tank (12), a waste material box (15) is arranged on the left side of the discharge hole (14), the right side of the waste material box (15) is fixedly connected with the left side of the water tank, the rear end of inlet tube (16) extends to the top of water tank (12), and the place ahead of water tank (12) is provided with door (17), door (17) articulate in the front of organism (1), and the front and back both sides of door (17) run through the positive inside and outside both sides of organism (1) respectively.

2. The agricultural seed screening device based on shaking screening and combined flotation according to claim 1, characterized in that: the shaking mechanism (4) comprises a speed reducing motor (41), a rotating shaft (42), an eccentric wheel (43), a pulley (44), a pulley fixing piece (45), a sliding rod (46), a connecting block (47) and a sleeve ring (48), wherein the speed reducing motor (41) is fixedly arranged at the top of the right side of the machine body (1), an output shaft of the speed reducing motor (41) is fixedly connected with one end of the rotating shaft (42) through a coupler, the rotating shaft (42) is back to the other side of the output shaft of the speed reducing motor (41), the bottom of the eccentric wheel (43) is in sliding connection with the top of the pulley (44), the left end and the right end of the pulley (44) are respectively in movable connection with the left side and the right side of the inner wall of the pulley fixing piece (45), the bottom of the pulley fixing piece (45) is fixedly connected with the sliding rod (46), the upper side and the lower side, and one side of two connecting blocks (47) of slide bar (46) that are the same as each other is all fixed connection on the lateral wall of screening case (3), the bottom of slide bar (46) and the inner circle sliding connection of lantern ring (48), and lantern ring (48) fixed connection is on the rear side of organism (1) inner wall.

3. The agricultural seed screening device based on shaking screening and combined flotation according to claim 1, characterized in that: the supporting resilience mechanism (11) comprises a fixed plate (111), a reset spring (112), a supporting plate (113), a fixed sleeve (114), a fixed rod (115), a guide sliding strip (116) and a guide sliding groove (117), the rear side of the fixed plate (111) is fixedly connected to the rear side of the inner wall of the machine body (1), the inner bottom of the fixed plate (111) is fixedly connected with the reset spring (112), the top end of the reset spring (112) is fixedly connected with the bottom of the supporting plate (113), one side of the supporting plate (113), opposite to the reset spring (112), is fixedly connected with the bottom of the screening box (3), the fixed sleeve (114) is fixedly connected with the inner bottom of the fixed plate (111), the fixed rod (115) is sleeved in the fixed sleeve (114), the top end of the fixed rod (115) penetrates through the top of the fixed plate (111) and is fixedly connected with the bottom of the supporting plate (113), and the guide sliding strip (116) is fixedly connected with, the front side and the rear side of the inner wall of the fixed sleeve (114) are both provided with guide sliding grooves (117), and one side of the inner wall of each guide sliding groove (117) which is opposite to the inner wall of each guide sliding groove is respectively in sliding connection with one side of the two guide sliding strips (116) which are opposite to each other and are fixed with the fixing rods (115).

4. The agricultural seed screening device based on shaking screening and combined flotation according to claim 2, characterized in that: the position of the side surface of the eccentric wheel (43) deviating from the circle center is fixedly connected with the rotating shaft (42), and a distance is kept between one side of the eccentric wheel (43) opposite to the rotating shaft (42) and the side wall of the screening box (3).

5. The agricultural seed screening device based on shaking screening and combined flotation according to claim 2, characterized in that: the pulley (44) is movably connected in the pulley fixing piece (45) through a pin shaft, and gaps are reserved between the two sides of the pulley (44) and the left side and the right side of the inner wall of the pulley fixing piece (45).

6. The agricultural seed screening device based on shaking screening and combined flotation according to claim 1, characterized in that: the sieve plate (5) is inclined relative to the bottom of the screening box (3), and a triangle is formed between the sieve plate (5) and the guide plate (8).