A windscreen for grass seed

Abstract

The application discloses a kind of pasture seed air screen cleaning machines, it is related to pasture seed cleaning machine technical field, including frame, still including seed screen movement mechanism, pasture seed holding mechanism, pasture seed shell separation promoting mechanism and air screen dust removal and awn removal mechanism, seed screen movement mechanism contains elastic support plate and screen movement box frame assembly, the top of frame is connected the four corners of screen movement box frame assembly respectively by four elastic support plates, the screen movement box frame assembly is sequentially installed with first screening assembly, secondary screening assembly, tertiary screening assembly and impurity receiving inclined plate from top to bottom, this pasture seed air screen cleaning machine, pasture seed shell separation promoting mechanism and seed discharge control mechanism cooperation can promote pod shell, thorn and pasture seed separation in the process of discharging, avoid its adhesion, facilitate subsequent screen out pod shell and thorn, reduce the number of pasture seed with pod shell being discarded, the efficiency of screening out pod shell in pasture seed is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pasture seed cleaning machine, in particular to a pasture seed air screen cleaner. BACKGROUND

[0002] In order to improve the quality of pasture, it is necessary to cultivate and plant pasture, and pasture seeds are generally planted by seeders. In order to adapt to pasture seeders, it is necessary to screen pasture seeds to screen out the hulls in the pasture seeds, because the seeds with hulls have low germination rate. Although the existing seed air screen cleaner screens out the hulls in the pasture seeds by using a vibrating screen, the overall screening efficiency is low, the hulls and the pasture seeds are adhered to a certain extent, which causes many pasture seeds to be discarded with the hulls, and a large amount of dust is raised during screening due to vibration. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defects of the prior art, provide a pasture seed air screen cleaner, and release the pasture seeds to be screened from the seed hopper to the primary screening assembly quickly, so that the pasture seed shell separation promoting mechanism and the seed discharge control mechanism cooperate to promote the separation of the hulls, burrs and pasture seeds during discharging, avoid adhesion, facilitate subsequent screening of the hulls and burrs, reduce the number of pasture seeds discarded with the hulls, improve the efficiency of screening the hulls in the pasture seeds, facilitate subsequent seeding by the seeder, improve the germination rate after seeding the pasture seeds, and adopt the air screen dust removal and burr removal mechanism to remove dust and separate burrs, avoid the burrs from entering the cyclone dust collector main body to affect the dust removal work, avoid the mixed burrs from affecting the seeding of the seeder, and effectively solve the problems in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a pasture seed air screen cleaner, comprising a rack, further comprising:

[0005] A seed screening mechanism includes elastic support plates and a screening box frame assembly. The top of the rack is connected to the four corners of the screening box frame assembly through four elastic support plates. The screening box frame assembly is sequentially provided with a primary screening assembly, a secondary screening assembly, a tertiary screening assembly and an impurity receiving inclined plate from top to bottom. The rear side of the screening box frame assembly is connected to a vibration driving assembly.

[0006] A pasture seed holding mechanism is installed at the top left end of the rack. A seed discharge control mechanism is installed on the pasture seed holding mechanism and located above the primary screening assembly. A pasture seed shell separation promoting mechanism is installed on the seed discharge control mechanism.

[0007] An air screen dust removal and burr removal mechanism is installed at the top right end of the rack.

[0008] The grass seed containing mechanism is used for containing the grass seed to be screened, the seed discharging control mechanism is used for controlling the release of the grass seed to be screened in the grass seed containing mechanism, and simultaneously, the grass seed to be screened is released and spread on the upper right end of the primary screening assembly. The grass seed shell separation promoting mechanism promotes the separation of the pod shell and the grass seed when the seed discharging control mechanism works. The elastic supporting plate is arranged to allow the left and right shaking of the sieve box frame assembly. The vibration driving assembly drives the sieve box frame assembly to vibrate, thereby driving the primary screening assembly, the secondary screening assembly and the tertiary screening assembly to vibrate. Due to the vibration, the grass seed to be screened moves leftward on the upper side of the primary screening assembly, and the larger and adhered pod shell or grass stem is screened out. The grass seed falling through the primary screening assembly falls on the secondary screening assembly, and the independent pod shell is screened out by moving rightward on the secondary screening assembly. The grass seed falling through the secondary screening assembly falls on the tertiary screening assembly, and the grass seed is discharged from the right end of the upper side of the tertiary screening assembly and is collected. The fine impurities and the burrs falling through the tertiary screening assembly fall on the impurity receiving inclined plate and fall from the right end of the impurity receiving inclined plate. The dust and burrs generated when the fine impurities fall can be removed by the air screening dust and burr removing mechanism. The dust and burrs generated when the grass seed to be screened on the seed discharging control mechanism falls on the primary screening assembly can also be removed by the air screening dust and burr removing mechanism.

[0009] Further, the primary screening assembly comprises a primary screen, a primary receiving chute and a primary discharge cylinder. The primary screen is detachably installed on the top of the sieve box frame assembly. The longitudinal primary receiving chute is fixedly connected to the left end of the primary screen. The top of the primary discharge cylinder is connected to the bottom of the front end of the primary receiving chute. The primary screen is detachable and replaceable. The grass seed to be screened is uniformly discharged on the right end of the primary screen. With the vibration of the primary screen, the grass seed to be screened moves leftward on the upper side of the primary screen. The grass seed, the pod shell, the fine impurities and the burrs fall through the screen holes of the primary screen. The adhered pod shell or grass stem remains on the upper side of the primary screen and falls from the left end of the primary screen into the primary receiving chute and is discharged through the primary discharge cylinder, thereby facilitating the collection of the adhered pod shell or grass stem.

[0010] Further, the pasture seed containing mechanism comprises a fixed support, a seed hopper and a vertical seed discharging cylinder, two fixed supports are fixedly connected to the top left end of the frame respectively, the top of the two fixed supports is connected to the front and rear sides of the seed hopper respectively, and the bottom of the seed hopper is provided with the vertical seed discharging cylinder. The fixed support is used to support the seed hopper, the seed hopper contains the pasture seeds to be screened, the pasture seeds to be screened can fall into the upper left end of the seed discharging control mechanism through the vertical seed discharging cylinder, and the seed discharging control mechanism can control the falling speed of the pasture seeds to be screened from the vertical seed discharging cylinder, and at the same time, the seed discharging control mechanism can also shake the pasture seeds to be screened, so that the pasture seeds and the hulls are separated, and the pasture seeds to be screened are uniformly dropped onto the upper side of the right end of the primary screen, so that the primary screen can fully and efficiently screen the pasture seeds to be screened.

[0011] Further, the seed discharging control mechanism comprises a U-shaped support, a pitch discharging control plate, a dispersion flow guide strip, an agitating tooth and a pitch power assembly, the U-shaped support is fixedly connected between the top of the two fixed supports, the left end of the U-shaped support is movably connected to the left end of the pitch discharging control plate, the rear side of the pitch discharging control plate is connected to the pitch power assembly, the upper surface of the pitch discharging control plate is provided with the dispersion flow guide strip, and the right end of the pitch discharging control plate is longitudinally and equidistantly provided with the agitating tooth. The middle part of the left end of the pitch discharging control plate is located directly below the vertical seed discharging cylinder, and the pitch power assembly is used to drive the right end of the pitch discharging control plate to move up and down, so that the pitch discharging control plate plays a role similar to a dustpan, when the right end of the pitch discharging control plate moves downward, the left end of the upper side of the pitch discharging control plate is away from the bottom end of the vertical seed discharging cylinder, the pasture seeds to be screened in the seed hopper fall into the middle part of the left end of the pitch discharging control plate through the vertical seed discharging cylinder, with repeated up and down movement of the right end of the pitch discharging control plate, the pasture seeds to be screened move rightward along the upper side of the pitch discharging control plate, when the right end of the pitch discharging control plate moves upward, the falling speed of the pasture seeds to be screened in the vertical seed discharging cylinder is reduced or stopped, at this time, the speed of the right end of the pitch discharging control plate moving up and down controlled by the pitch power assembly can control the discharging speed, the setting of the dispersion flow guide strip can gradually disperse the pasture seeds concentrated in the middle part of the left end of the pitch discharging control plate during the rightward movement, so that the pasture seeds falling from the right end of the pitch discharging control plate are uniformly dropped onto the upper side of the right end of the primary screen, and the pitch movement of the right end of the pitch discharging control plate is beneficial to the scattering of the falling pasture seeds by the agitating tooth, so as to avoid the adhesion of the hulls, and facilitate the subsequent screening of the pasture seeds by the primary screen.

[0012] Further, the pitching power assembly comprises a power motor, a cam, an arc-shaped through slot, a movable column, a wear-resistant wheel and a return spring, an arc-shaped through slot is formed in the rear right end of the U-shaped support, the rear right end of the pitching blanking control plate is fixedly connected with the front end of the movable column, the movable column is slidably connected with the arc-shaped through slot, the top end of the return spring is connected with the top of the arc-shaped through slot, the bottom of the return spring is connected with the upper side of the movable column, the rear end of the movable column is rotatably connected with the wear-resistant wheel, and the rear right bottom of the U-shaped support is provided with the power motor, the output shaft of the power motor is fixedly connected with the cam, and the bottom of the wear-resistant wheel is in rolling contact with the top of the cam. The power motor drives the cam to rotate, when the convex part of the cam lifts the wear-resistant wheel, the movable column can move upwards along the arc-shaped through slot, the return spring is compressed at this time, and the movable column drives the right end of the pitching blanking control plate to move upwards, when the convex part of the cam faces downward, the return spring rebounds and elongates, pushes the movable column to move downwards along the arc-shaped through slot, and the movable column drives the right end of the pitching blanking control plate to move downwards, along with the continuous working of the power motor, the right end of the pitching blanking control plate can be pitched reciprocatingly, and the speed of the pitching blanking control plate can be controlled by controlling the rotating speed of the power motor, so as to control the blanking speed.

[0013] Further, the wind screen dust removal and burr removal mechanism comprises a support air duct, a material passing through slot, a impurity blanking through slot and a negative pressure box, the right end of the rack is provided with the impurity blanking through slot, the bottom end of the support air duct is connected with the position corresponding to the impurity blanking through slot at the top of the right end of the rack, the left side of the bottom of the support air duct is provided with the material passing through slot, the right end of the impurity receiving inclined plate extends to the inside of the material passing through slot, and the right end of the negative pressure box is connected with the left side of the top of the support air duct. The support air duct is used as a support to support the installation of the negative pressure box, the negative pressure state is maintained in the negative pressure box, the impurities on the impurity receiving inclined plate slide to the right and fall into the bottom of the support air duct, and the negative pressure state in the negative pressure box promotes the formation of upward air flow in the support air duct, so that the dust and burrs contained in the impurities are driven upward in the support air duct and finally enter the negative pressure box, and the impurities without dust and burrs are discharged from the impurity blanking through slot, so that the dust raising of the surrounding environment can be reduced.

[0014] Further, the wind screen dust removal and awn removal mechanism further comprises a middle partition, a left partition, a right partition, a vertical air duct, an exhaust air duct and a cyclone dust collector main body. The top of the left partition, the middle partition and the right partition are sequentially and fixedly connected to the top of the negative pressure box from left to right. The top of the left partition is bent to the left. The bottom of the middle partition is bent to the left. The vertical air duct is arranged on the left side of the negative pressure box. The top of the vertical air duct is communicated with the left side of the top of the negative pressure box through an air inlet channel. One end of the exhaust air duct is connected to the top of the negative pressure box between the left partition and the middle partition. The other end of the exhaust air duct is connected to the air inlet of the cyclone dust collector main body. The cyclone dust collector main body is in a negative pressure state through the exhaust air duct. The grass seeds falling from the right end of the pitch control board contain dust and awns. The dust and awns enter the area on the left side of the left partition in the negative pressure box through the vertical air duct. The left partition facilitates the settlement of the awns to the bottom of the negative pressure box. The dust enters the cyclone dust collector main body through the exhaust air duct. The dust is separated by the centrifugal force of the airflow in the cyclone dust collector main body, achieving dust removal. The airflow, dust and awns drawn into the negative pressure box from the support air duct also pass through the bottom of the middle partition, facilitating the settlement of the awns to the bottom of the negative pressure box. Since the middle partition and the left partition facilitate the settlement of the awns, the awns can be prevented from entering the cyclone dust collector main body, avoiding the influence of the awns on the normal dust removal work of the cyclone dust collector main body.

[0015] Further, the grass seed hull separation promoting mechanism comprises an accommodating arc plate and separation promoting teeth. The top of the accommodating arc plate is fixedly connected to the bottom right side of the vertical air duct. The center of the circle where the accommodating arc plate is located coincides with the center of the circle where the arc channel is located. The separation promoting teeth are longitudinally and equidistantly arranged on the left side of the accommodating arc plate. The separation promoting teeth and the stirring teeth are alternately arranged. The to-be-screened grass seeds falling from the right end of the pitch control board first fall onto the accommodating arc plate, and then fall to the left along the upper side of the accommodating arc plate. The to-be-screened grass seeds encounter the separation promoting teeth during the falling process. Since the right end of the pitch control board drives the stirring teeth to reciprocate up and down, the alternately arranged stirring teeth and separation promoting teeth cooperate to rub the to-be-screened grass seeds, avoiding the adhesion of the hulls and the grass seeds, facilitating the separation of the hulls and the grass seeds, and also facilitating the separation of the hulls and the awns, avoiding the awns on the hulls from blocking the hulls passing through the screen holes of the primary screen. The dust and the awns generated during the rubbing process enter the negative pressure box through the vertical air duct due to the negative pressure in the negative pressure box.

[0016] Further, the pasture grass seed shell separation promoting mechanism further comprises a roller frame, a roller and a separation roller protrusion, the bottom of the pitch unloading control plate is fixedly connected with two roller frames on the front and back sides, a longitudinal roller is rotatably connected between the bottoms of the two roller frames, and the outer circumferential side of the roller is uniformly provided with a separation roller protrusion. The position of the roller is below the middle part of the pitch unloading control plate, and the pitch unloading control plate right end up and down reciprocating activity also drives the roller frame and the roller to move up and down. When the roller moves down, it is close to the upper side of the first screen, and the roller can crush the pasture grass seeds on the first screen through the separation roller protrusion. The separation of the hull and the pasture grass seed can be promoted in the screening process, and the separation of the hull and the burr can also be promoted, which is beneficial to the screening of the hull, the pasture grass seed and the burr.

[0017] Further, it further comprises a negative pressure box negative pressure control mechanism and a burr collection mechanism, the negative pressure box negative pressure control mechanism comprises a rectangular air inlet frame, a mesh plate and an air inlet control slide plate, the rectangular air inlet frame is arranged on the top of the negative pressure box between the middle partition plate and the right partition plate, the mesh plate is arranged on the inner bottom of the rectangular air inlet frame, and the inner top of the rectangular air inlet frame is longitudinally slidably connected with two air inlet control slide plates on the front and back sides. The bottom of the negative pressure box is connected with the burr collection mechanism, and the burr collection mechanism is located directly below the rectangular air inlet frame. The settled burr in the negative pressure box falls into the burr collection mechanism, and the settled burr can be taken out and cleaned by means of the burr collection mechanism. By pushing and pulling the air inlet control slide plate to move forward and backward, the air inlet amount into the negative pressure box through the rectangular air inlet frame can be controlled, the negative pressure degree in the negative pressure box can be controlled, the negative pressure is ensured to be at an appropriate level, the burr can be ensured to settle in the negative pressure box, dust can be ensured to smoothly enter the cyclone dust collector main body, the mesh plate is arranged to avoid that the dust in the negative pressure box is discharged through the rectangular air inlet frame after the cyclone dust collector main body is stopped, and external sundries are also avoided from entering the negative pressure box through the rectangular air inlet frame. The right partition plate is arranged to avoid that the negative pressure on the right side in the negative pressure box is lost due to the rectangular air inlet frame.

[0018] Compared with the prior art, the pasture grass seed air screen cleaner has the following beneficial effects:

[0019] 1. The pasture grass seed air screen cleaner, by controlling the speed of the pitch unloading control plate right end up and down reciprocating activity through the pitch power assembly, the speed of unloading can be controlled, the dispersed flow guide strips can make the pasture grass seeds concentrated on the middle part of the pitch unloading control plate left end gradually disperse in the process of moving to the right, which is beneficial to the pasture grass seeds falling from the pitch unloading control plate right end to uniformly fall on the upper side of the first screen right end, and the pitch unloading control plate right end pitch activity is beneficial to the stirring teeth to stir the falling pasture grass seeds, avoid hull adhesion, and facilitate subsequent screening of the pasture grass seeds by the first screen.

[0020] 2. The forage seed air screen cleaner, the forage seed to be screened released from the seed hopper can be quickly spread on the first screening assembly, the forage seed shell separation promoting mechanism and the seed discharging control mechanism cooperate to promote the separation of the pod shell, the burr and the forage seed in the discharging process, avoid the adhesion, facilitate the subsequent screening of the pod shell and the burr, reduce the number of forage seeds discarded with the pod shell, the efficiency of screening the pod shell in the forage seed is high, it is beneficial to subsequent seeding with the seeder, and it is beneficial to improve the germination rate after the forage seed is seeded.

[0021] 3. The forage seed air screen cleaner, the dust and burr removing mechanism can remove dust and separate burrs, which can avoid the burrs entering the main body of the cyclone dust collector and affecting the dust removal work, and the screened burrs can also avoid mixing into the forage seed and affecting the seeding of the seeder. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The forage seed air screen cleaner structure schematic view of the application;

[0023] Figure 2 The forage seed air screen cleaner structure schematic view of the application; Figure 1 The forage seed air screen cleaner structure schematic view of the application;

[0024] Figure 3 The forage seed air screen cleaner structure schematic view of the application;

[0025] Figure 4 The forage seed air screen cleaner structure schematic view of the application; Figure 1 ;

[0026] Figure 5 The forage seed air screen cleaner structure schematic view of the application; Figure 2 ;

[0027] Figure 6 The forage seed air screen cleaner structure schematic view of the application; Figure 5 The forage seed air screen cleaner structure schematic view of the application;

[0028] Figure 7 The forage seed air screen cleaner structure schematic view of the application; Figure 5 The forage seed air screen cleaner structure schematic view of the application;

[0029] Figure 8 The forage seed air screen cleaner structure schematic view of the application; Figure 7 The forage seed air screen cleaner structure schematic view of the application;

[0030] Figure 9 The forage seed air screen cleaner structure schematic view of the application; Figure 3 ;

[0031] Figure 10 The forage seed air screen cleaner structure schematic view of the application; Figure 9 The forage seed air screen cleaner structure schematic view of the application;

[0032] Figure 11 For the invention Figure 9 Local enlarged structure diagram of E in the invention

[0033] In the figure: 1 frame, 2 seed screening mechanism, 21 angle block, 22 elastic support plate, 23 side plate, 24 top connecting frame, 25 impurity receiving inclined plate, 26 first level screen, 27 first level receiving inclined chute, 28 first level discharge cylinder, 29 second level screen, 210 second level receiving inclined chute, 211 second level discharge cylinder, 212 third level screen, 213 third level receiving inclined chute, 214 third level discharge cylinder, 215 convex edge, 216 side column, 217 connecting rod, 218 movable shaft, 219 short rotary arm, 220 drive motor, 3 pasture seed containing mechanism, 31 fixed support rod, 32 seed hopper, 33 disassembly support rod, 34 discharge vertical cylinder, 4 seed discharge control mechanism, 41 U-shaped support, 42 rotating shaft, 43 rotating cylinder, 44 pitch control plate, 45 side baffle, 46 dispersion guide strip, 47 stirring tooth, 48 motor base, 49 power motor, 410 cam, 411 circular arc through slot, 412 movable column, 413 wear-resistant wheel, 414 return spring, 5 wind screen dust removal and awn removal mechanism, 51 support air duct, 52 fixed seat, 53 material passing through slot, 54 impurity discharge passage, 55 negative pressure box, 56 middle partition, 57 left partition, 58 right partition, 59 vertical air duct, 510 exhaust air duct, 511 cyclone dust collector main body, 512 air extraction pipeline, 513 negative pressure pump, 6 pasture seed shell separation promoting mechanism, 61 receiving arc plate, 62 separation promoting tooth, 63 roller frame, 64 roller, 65 separation roller convex, 7 negative pressure control mechanism of negative pressure box, 71 rectangular air inlet frame, 72 mesh plate, 73 air inlet control slide, 74 handle, 8 awn collection mechanism, 81 clamping groove, 82 collection box, 83 clamping strip, 84 handle, 9 universal wheel with brake. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] Embodiment one, please refer to Figures 1 to 11 The technical solution provided by the present embodiment is: a pasture seed wind screen cleaner, which comprises a frame 1, four universal wheels 9 with brake are respectively installed at the bottom corners of the frame 1, which facilitates the movement of the frame 1, and further comprises a seed screening mechanism 2, a pasture seed containing mechanism 3, a seed discharge control mechanism 4, a wind screen dust removal and awn removal mechanism 5, and a pasture seed shell separation promoting mechanism 6.

[0036] The seed screening mechanism 2 comprises elastic support plates 22, a screening box frame assembly, an impurity receiving inclined plate 25, a first screening assembly, a second screening assembly, a third screening assembly and a vibration driving assembly. The top of the frame 1 is connected to the four corners of the screening box frame assembly through four elastic support plates 22 respectively. The screening box frame assembly is sequentially provided from top to bottom with the first screening assembly, the second screening assembly, the third screening assembly and the impurity receiving inclined plate 25. The impurity receiving inclined plate 25 is arranged in a left-low and right-high inclined manner. The rear side of the screening box frame assembly is connected to the vibration driving assembly.

[0037] The screening box frame assembly comprises side plates 23 and a top connecting frame 24. The top center of the two side plates 23 is connected and fixed through the top connecting frame 24 to form the screening box frame assembly. The impurity receiving inclined plate 25 is located between the bottom of the two side plates 23.

[0038] The seed screening mechanism 2 further comprises corner blocks 21. The upper and lower ends of the elastic support plates 22 are respectively connected and fixed with the corner blocks 21 through screws. The corner blocks 21 at the bottom of the elastic support plates 22 are installed on the corresponding positions of the top of the frame 1 through bolts. The corner blocks 21 at the top of the elastic support plates 22 are fixedly connected to the outer sides of the corresponding side plates 23 through bolts. The corner blocks 21 achieve the detachable installation of the elastic support plates 22 and the frame 1, and also achieve the detachable installation of the elastic support plates 22 and the side plates 23.

[0039] The first screening assembly comprises a first screen 26, a first receiving inclined chute 27 and a first discharge cylinder 28. The first screen 26 is detachably installed at the top of the screening box frame assembly. The first screen 26 is arranged in a left-low and right-high inclined manner. The first receiving inclined chute 27 is fixedly connected to the position at the left end and lower side of the first screen 26 in the screening box frame assembly. The bottom of the first receiving inclined chute 27 is arranged in a front-low and rear-high inclined manner. The front end of the first receiving inclined chute 27 is connected to the top of the first discharge cylinder 28.

[0040] The inner sides of the two side plates 23 are respectively provided with two disassembly grooves at positions corresponding to the first screen 26. The front and rear sides of the first screen 26 are installed in cooperation with the two disassembly grooves. The disassembly grooves are threadedly connected with fastening bolts. The bottom of the fastening bolts abuts against the upper side of the corresponding edge of the first screen 26. Thus, the first screen 26 is detachably installed.

[0041] The first screen 26 is detachable and replaceable. After the screened pasture seeds are uniformly dropped onto the upper side of the right end of the first screen 26, the screened pasture seeds move leftward along the upper side of the first screen 26 with the vibration of the first screen 26. The pasture seeds, husks, fine impurities and burrs fall through the screen holes of the first screen 26. The adhered husks or grass stalks remain on the upper side of the first screen 26 and fall from the left end of the first screen 26 into the first receiving inclined chute 27 and are concentrated and discharged through the first discharge cylinder 28, facilitating the collection of the adhered husks or grass stalks.

[0042] The secondary screening assembly comprises a secondary screen 29, a secondary receiving chute 210 and a secondary discharge cylinder 211. The secondary screen 29 is detachably installed between the two side plates 23 below the primary screen 26. The secondary screen 29 is arranged with a left high and right low inclination. The longitudinal secondary receiving chute 210 is installed between the two side plates 23 below the right end of the secondary screen 29. The inner bottom of the secondary receiving chute 210 is arranged with a front low and rear high inclination. The front end of the secondary receiving chute 210 penetrates through the front side plate 23, and the front end bottom of the secondary receiving chute 210 is connected to the top end of the secondary discharge cylinder 211. The pods, grass seeds, fine impurities and burrs fall onto the upper side of the secondary screen 29. The grass seeds, fine impurities and burrs pass through the screen holes on the secondary screen 29, and the pods remain on the upper side of the secondary screen 29. With the vibration of the secondary screen 29 and the screen moving box frame assembly, the pods fall from the right end of the secondary screen 29 into the secondary receiving chute 210, and then are discharged through the secondary discharge cylinder 211. The detachable installation of the secondary screen 29 and the side plate 23 is the same as that of the primary screen 26.

[0043] The tertiary screening assembly comprises a tertiary screen 212, a tertiary receiving chute 213 and a tertiary discharge cylinder 214. The tertiary screen 212 is detachably installed between the two side plates 23 below the secondary screen 29. The tertiary screen 212 is arranged with a left high and right low inclination. The longitudinal tertiary receiving chute 213 is installed between the two side plates 23 below the right end of the tertiary screen 212. The inner bottom of the tertiary receiving chute 213 is arranged with a front high and rear low inclination. The rear end of the tertiary receiving chute 213 penetrates through the rear side plate 23, and the rear end bottom of the tertiary receiving chute 213 is connected to the top end of the tertiary discharge cylinder 214. The grass seeds, fine impurities and burrs fall onto the tertiary screen 212. The fine impurities and burrs fall onto the impurity receiving chute 25 through the screen holes on the tertiary screen 212, and the grass seeds remain on the tertiary screen 212. With the vibration of the tertiary screen 212, the grass seeds fall into the tertiary receiving chute 213, and then are discharged through the tertiary discharge cylinder 214.

[0044] The vibration driving assembly comprises a side column 216, a connecting rod 217, a movable shaft 218, a short rotary arm 219 and a driving motor 220. The left end of the rear side plate 23 is fixedly connected with the side column 216. The side column 216 is movably connected with one end of the connecting rod 217. The other end of the connecting rod 217 is movably connected with one end of the short rotary arm 219 through the movable shaft 218. The other end of the short rotary arm 219 is fixedly connected with the output shaft of the driving motor 220. The driving motor 220 is installed on the top of the frame 1. The driving motor 220 drives the short rotary arm 219 to rotate. The short rotary arm 219 drives the side column 216 to reciprocate left and right through the connecting rod 217. The side column 216 drives the sieve box frame assembly to reciprocate left and right. Since the sieve box frame assembly is elastically installed on the frame 1 through the elastic supporting plate 22, the driving motor 220 drives the sieve box frame assembly to vibrate left and right. The impurity receiving inclined plate 25, the first screening assembly, the second screening assembly and the third screening assembly constitute the mechanism of the vibrating screen.

[0045] The forage seed containing mechanism 3 is installed on the top left end of the frame 1. The forage seed containing mechanism 3 is installed with the seed discharging control mechanism 4. The seed discharging control mechanism 4 is located above the first screening assembly. The forage seed hull separation promoting mechanism 6 is installed on the seed discharging control mechanism 4.

[0046] The forage seed containing mechanism 3 comprises fixed supporting rods 31, a seed hopper 32, dismounting rods 33 and a discharging vertical cylinder 34. Two fixed supporting rods 31 are fixedly connected with the top left end of the frame 1. The top of the two fixed supporting rods 31 is detachably fixedly connected with the bottom end of the two dismounting rods 33 through screws. The top of the two dismounting rods 33 is connected with the front and rear sides of the seed hopper 32 respectively. The bottom of the seed hopper 32 is provided with the discharging vertical cylinder 34. The fixed supporting rods 31 are used to support the seed hopper 32. The seed hopper 32 contains the forage seeds to be screened. The forage seeds to be screened can fall to the upper left end of the seed discharging control mechanism 4 through the discharging vertical cylinder 34. The seed discharging control mechanism 4 controls the falling speed of the forage seeds to be screened from the discharging vertical cylinder 34. At the same time, the seed discharging control mechanism 4 shakes the forage seeds to be screened, separates the forage seeds from the hulls, and makes the forage seeds to be screened fall uniformly on the upper side of the right end of the first screen 26, so as to promote the first screen 26 to screen the forage seeds to be screened sufficiently and efficiently.

[0047] The seed discharging control mechanism 4 comprises a U-shaped support 41, a pitching discharging control plate 44, a dispersion flow guide strip 46, an agitating tooth 47 and a pitching power assembly. The top of the two fixed support rods 31 is fixedly connected with the U-shaped support 41, the opening of the U-shaped support 41 faces the right side, the left end of the U-shaped support 41 is movably connected with the left end of the pitching discharging control plate 44, the rear side of the pitching discharging control plate 44 is connected with the pitching power assembly, the upper surface of the pitching discharging control plate 44 is provided with the dispersion flow guide strip 46, the dispersion flow guide strip 46 on the pitching discharging control plate 44 is divided into two groups, one group of the dispersion flow guide strip 46 is located on the rear side of the upper surface of the pitching discharging control plate 44, the right end of the dispersion flow guide strip 46 faces the right rear side, the other group of the dispersion flow guide strip 46 is located on the front side of the upper surface of the pitching discharging control plate 44, the right end of the dispersion flow guide strip 46 faces the right front side, wherein each group of the dispersion flow guide strip 46 comprises two dispersion flow guide strips 46, and the right end of the pitching discharging control plate 44 is longitudinally and equidistantly provided with the agitating tooth 47.

[0048] Specifically, the seed discharging control mechanism 4 further comprises a rotating shaft 42, a rotating drum 43 and a side baffle 45, the left end of the pitching discharging control plate 44 is integrally connected with the longitudinal rotating drum 43, the rotating drum 43 is rotatably connected with the rotating shaft 42, the rotating shaft 42 is installed in the left end of the U-shaped support 41, the top of the pitching discharging control plate 44 is provided with two side baffles 45 on the front and rear sides, respectively, the side baffles 45 block the top of the pitching discharging control plate 44 on the front and rear sides, so as to avoid the to-be-screened pasture seeds from falling from the front and rear sides of the pitching discharging control plate 44.

[0049] The middle part of the left end of the pitching discharging control plate 44 is located directly below the discharging vertical cylinder 34, the pitching power assembly is used to drive the right end of the pitching discharging control plate 44 to move up and down, so that the pitching discharging control plate 44 plays a role similar to a dustpan, when the right end of the pitching discharging control plate 44 moves downward, the left end of the upper side of the pitching discharging control plate 44 is away from the bottom end of the discharging vertical cylinder 34, the to-be-screened pasture seeds in the seed hopper 32 fall to the middle part of the left end of the pitching discharging control plate 44 through the discharging vertical cylinder 34, with the repeated up and down movement of the right end of the pitching discharging control plate 44, the to-be-screened pasture seeds move right along the upper side of the pitching discharging control plate 44, when the right end of the pitching discharging control plate 44 moves upward, the falling speed of the to-be-screened pasture seeds in the discharging vertical cylinder 34 decreases or stops, at this time, the speed of the right end of the pitching discharging control plate 44 moving up and down controlled by the pitching power assembly can control the discharging speed, the setting of the dispersion flow guide strip 46 can make the pasture seeds concentrated on the middle part of the left end of the pitching discharging control plate 44 gradually dispersed in the process of moving right, which is beneficial to the to-be-screened pasture seeds falling from the right end of the pitching discharging control plate 44 to uniformly fall on the right upper side of the primary screen 26, and the pitching movement of the right end of the pitching discharging control plate 44 is beneficial to the to-be-screened pasture seeds being stirred and scattered by the agitating tooth 47, so as to avoid the husks from being adhered, which is beneficial to the subsequent screening of the pasture seeds by the primary screen 26.

[0050] The pitch power assembly comprises a motor base 48, a power motor 49, a cam 410, an arc-shaped through slot 411, a movable column 412, a wear-resistant wheel 413 and a return spring 414. The right end of the rear side of the U-shaped support 41 is provided with the arc-shaped through slot 411. The center of the circle where the arc-shaped through slot 411 is located coincides with the axis of the rotating shaft 42. The right end of the rear side of the pitch blanking control plate 44 is fixedly connected to the front end of the movable column 412. The movable column 412 is in sliding connection with the arc-shaped through slot 411. The top end of the return spring 414 is connected to the top of the arc-shaped through slot 411. The bottom of the return spring 414 is connected to the upper side of the movable column 412. The rear end of the movable column 412 is rotatably connected to the wear-resistant wheel 413. The bottom of the wear-resistant wheel 413 is in rolling contact with the top of the cam 410. The power motor 49 is installed on the right end of the rear side of the U-shaped support 41 through the motor base 48. The output shaft of the power motor 49 is fixedly connected to the cam 410. When the power motor 49 works to drive the cam 410 to rotate, the protruding part of the cam 410 lifts the wear-resistant wheel 413. At this time, the movable column 412 can move upward along the arc-shaped through slot 411. At this time, the return spring 414 is compressed, and the movable column 412 drives the right end of the pitch blanking control plate 44 to move upward. When the protruding part of the cam 410 faces downward, the return spring 414 rebounds and extends to push the movable column 412 to move downward along the arc-shaped through slot 411. The movable column 412 drives the right end of the pitch blanking control plate 44 to move downward. With the continuous work of the power motor 49, the right end of the pitch blanking control plate 44 can be driven to pitch reciprocatingly. The speed of the pitch blanking control plate 44 can be controlled by controlling the rotating speed of the power motor 49, so as to control the blanking speed.

[0051] The wind screen dust removal and awn removal mechanism 5 is installed on the top right end of the frame 1.

[0052] The wind screen dust removal and awn removal mechanism 5 comprises a support air duct 51, a material passing through slot 53, a impurity blanking through slot 54 and a negative pressure box 55. The right end of the frame 1 is provided with the impurity blanking through slot 54. The bottom end of the support air duct 51 is connected to the position corresponding to the impurity blanking through slot 54 on the top right end of the frame 1. The left side of the bottom of the support air duct 51 is provided with the material passing through slot 53. The right end of the impurity receiving inclined plate 25 extends to the inside of the material passing through slot 53. The right end of the support air duct 51 is connected to the left end of the negative pressure box 55.

[0053] Specifically, the wind screen dust removal and awn removal mechanism 5 further comprises a fixing seat 52. Two fixing seats 52 are respectively arranged on the front and rear sides of the bottom of the support air duct 51. The fixing seats 52 are fixedly connected to the corresponding positions on the top of the frame 1 through dismounting screws.

[0054] Two convex edges 215 are respectively fixedly connected to the front and rear positions on the upper side of the right end of the impurity receiving inclined plate 25. The arrangement of the two convex edges 215 avoids the impurities and awns screened out from falling from the front and rear sides of the right end of the impurity receiving inclined plate 25.

[0055] The support air duct 51 first serves as a support for supporting the negative pressure box 55, which maintains a negative pressure state, and the impurities on the impurity receiving inclined plate 25 slide to the right into the bottom of the support air duct 51, and the negative pressure state in the negative pressure box 55 promotes the formation of an upward air flow in the support air duct 51, which can carry the dust and thorns contained in the impurities upward in the support air duct 51 and finally into the negative pressure box 55, while the impurities without dust and thorns are discharged from the impurity discharge slot 54, which can reduce the dust raising of the surrounding environment.

[0056] The wind screen dust and thorn removing mechanism 5 further comprises a middle partition plate 56, a left partition plate 57, a right partition plate 58, a vertical air duct 59, an exhaust air duct 510, and a cyclone dust collector body 511. The top of the left partition plate 57, the middle partition plate 56, and the right partition plate 58 are sequentially fixed and connected to the top of the negative pressure box 55 from left to right. The top of the left partition plate 57 is bent to the left, and the bottom of the middle partition plate 56 is bent to the left. The vertical air duct 59 is arranged on the left side of the negative pressure box 55. The top of the vertical air duct 59 is in communication with the left side of the top of the negative pressure box 55 through an air inlet slot. One end of the exhaust air duct 510 is connected to the top of the negative pressure box 55 between the left partition plate 57 and the middle partition plate 56. The other end of the exhaust air duct 510 is detachably connected to the air inlet of the cyclone dust collector body 511 through a screw. The cyclone dust collector body 511 is in a negative pressure state in the negative pressure box 55 through the exhaust air duct 510. The grass seeds falling from the right end of the pitch control board 44 may contain dust and thorns. The dust and thorns enter the area on the left side of the left partition plate 57 in the negative pressure box 55 through the vertical air duct 59. The left partition plate 57 facilitates the settlement of the thorns to the bottom of the negative pressure box 55. The dust enters the cyclone dust collector body 511 through the exhaust air duct 510 with the air. The dust is separated by the centrifugal force of the air flow in the cyclone dust collector body 511, achieving dust removal. The air flow, dust, and thorns drawn into the negative pressure box 55 from the support air duct 51 also pass through the bottom of the middle partition plate 56, promoting the settlement of the thorns to the bottom of the negative pressure box 55. The middle partition plate 56 and the left partition plate 57 facilitate the settlement of the thorns, preventing the thorns from entering the cyclone dust collector body 511 and affecting the normal dust removal work of the cyclone dust collector body 511.

[0057] The wind screen dust and thorn removing mechanism 5 further comprises an exhaust duct 512 and a negative pressure pump 513. The top air outlet of the cyclone dust collector body 511 is connected to one end of the exhaust duct 512. The other end of the exhaust duct 512 is connected to the air inlet of the negative pressure pump 513. The negative pressure pump 513 is installed at the bottom of the rear side of the machine frame 1. The negative pressure pump 513 works to provide air flow power for the work of the cyclone dust collector body 511 through the exhaust duct 512. The cyclone dust collector body 511, the exhaust duct 512, and the negative pressure pump 513 constitute a cyclone dust removal device, which works with existing technology.

[0058] In use, the pasture seed containing mechanism 3 is used to contain the pasture seeds to be screened, the seed discharging control mechanism 4 is used to control the release of the pasture seeds to be screened in the pasture seed containing mechanism 3, and the pasture seeds to be screened are released flatly to the right end of the upper side of the first screening assembly. The pasture seed shell separation promoting mechanism 6 promotes the separation of the pods and the pasture seeds when the seed discharging control mechanism 4 is working. The elastic supporting plate 22 is arranged to allow the shaking of the sieve box frame assembly left and right. The vibration driving assembly drives the vibration of the sieve box frame assembly, thereby driving the vibration of the first screening assembly, the second screening assembly, and the third screening assembly. Due to the vibration, the pasture seeds to be screened move left on the upper side of the first screening assembly, and the larger and more connected pods or grass stems are screened out. The pasture seeds falling through the first screening assembly fall onto the second screening assembly, and the second screening assembly moves right. The independent pods are screened out. The pasture seeds falling through the second screening assembly fall onto the third screening assembly. The pasture seeds are discharged from the right end of the upper side of the third screening assembly and are collected. The fine impurities and the thorns are removed through the third screening assembly and fall from the right end of the impurity receiving inclined plate 25. The dust generated when the fine impurities fall and the thorns in the fine impurities can be removed by the air screening dust and thorn removing mechanism 5. When the pasture seeds to be screened on the seed discharging control mechanism 4 fall onto the first screening assembly, dust and thorns are also raised. The air screening dust and thorn removing mechanism 5 can also remove the dust and thorns.

[0059] Embodiment two, please refer to Figures 1 to 11 The embodiment provides a technical scheme: a pasture seed air screening and cleaning machine. The embodiment is a further explanation of the structure of embodiment one.

[0060] The pasture seed shell separation promoting mechanism 6 comprises a receiving arc plate 61 and separation promoting teeth 62. The bottom right side of the vertical air duct 59 is fixedly connected to the top of the receiving arc plate 61. The center of the circle where the receiving arc plate 61 is located coincides with the center of the circle where the arc through slot 411 is located. The left side of the receiving arc plate 61 is longitudinally and equidistantly provided with the separation promoting teeth 62. The separation promoting teeth 62 are alternately arranged with the stirring teeth 47. The pasture seeds to be screened falling from the right end of the pitch discharging control plate 44 will first fall onto the receiving arc plate 61, and then fall left along the upper side of the receiving arc plate 61. During the falling process, the separation promoting teeth 62 will be encountered. At this time, the alternately distributed stirring teeth 47 and separation promoting teeth 62 cooperate to rub the pasture seeds to be screened in the falling process, so as to avoid the adhesion of the pods and the pasture seeds, facilitate the separation of the pods and the pasture seeds, and also facilitate the separation of the pods and the thorns, so as to avoid the thorns on the pods from blocking the pods from passing through the screen holes of the first screen 26. The dust and the thorns generated in the rubbing process enter the negative pressure box 55 through the vertical air duct 59 due to the negative pressure in the negative pressure box 55.

[0061] The pasture grass seed shell separation promoting mechanism 6 further comprises roller frames 63, a roller 64 and separation roller protrusions 65, two roller frames 63 are fixedly connected to the front and rear sides of the bottom of the pitch unloading control plate 44 respectively, a longitudinal roller 64 is rotatably connected between the bottoms of the two roller frames 63, and the outer circumferential sides of the roller 64 are uniformly provided with separation roller protrusions 65. The position of the roller 64 is below the middle part of the pitch unloading control plate 44, and the roller frames 63 and the roller 64 also reciprocate up and down at the right end of the pitch unloading control plate 44, when the roller 64 moves downward, it is close to the upper side of the primary screen 26, and the roller 64 crushes the pasture grass seeds to be screened on the primary screen 26 through the separation roller protrusions 65, which can also promote the separation of pods and pasture grass seeds, and can also promote the separation of pods and thorns, which is beneficial to the screening of pods, pasture grass seeds and thorns respectively.

[0062] Embodiment three, please refer to Figures 1 to 11 The embodiment provides a technical scheme: a pasture grass seed air screen cleaner, the embodiment is substantially the same as that of embodiment two, and the difference lies in that;

[0063] Further comprising a negative pressure box negative pressure control mechanism 7 and a thorn collection mechanism 8, the negative pressure box negative pressure control mechanism 7 comprises a rectangular air inlet frame 71, a mesh plate 72 and an air inlet control sliding plate 73, the rectangular air inlet frame 71 is arranged at the position between the middle partition plate 56 and the right partition plate 58 of the top of the negative pressure box 55, the mesh plate 72 is arranged on the inner bottom of the rectangular air inlet frame 71, the top of the rectangular air inlet frame 71 is longitudinally slidably connected with the two air inlet control sliding plates 73, the bottom of the negative pressure box 55 is connected with the thorn collection mechanism 8, the thorn collection mechanism 8 is located directly below the rectangular air inlet frame 71, the front air inlet control sliding plate 73 passes through the rectangular through slot at the front end of the rectangular air inlet frame 71, and the rear air inlet control sliding plate 73 passes through the rectangular through slot at the rear end of the rectangular air inlet frame 71.

[0064] The negative pressure box negative pressure control mechanism 7 further comprises a handle 74, one end of the air inlet control sliding plate 73, which is located outside the end of the rectangular air inlet frame 71, is provided with the handle 74, and the handle 74 facilitates the sliding control of the air inlet control sliding plate 73 relative to the rectangular air inlet frame 71.

[0065] The thorn collecting mechanism 8 comprises a clamping groove 81, a collecting box 82, a clamping strip 83 and a handle 84, two clamping grooves 81 are fixedly connected on both sides of the collecting opening at the bottom of the negative pressure box 55, two clamping strips 83 are arranged on the top of the collecting box 82, the two clamping strips 83 are slidably connected with the two clamping grooves 81 respectively, the handle 84 is fixedly connected to the front end of the collecting box 82, the thorns settled in the negative pressure box 55 fall into the collecting box 82, the collecting box 82 can be pulled out by pulling it forward through the handle 84, so that the clamping strip 83 moves forward along the clamping groove 81, the collected thorns can be cleaned conveniently, and in order to improve the sealing between the collecting box 82 and the bottom of the negative pressure box 55, a sealing rubber strip can be added at the gap.

[0066] The thorns settled in the negative pressure box 55 fall into the thorn collecting mechanism 8, the settled thorns can be taken out and cleaned by the thorn collecting mechanism 8, the air inlet control sliding plate 73 moves forward and backward by pushing and pulling, the air inlet amount entering the negative pressure box 55 through the rectangular air inlet frame 71 can be controlled, the negative pressure degree in the negative pressure box 55 can be controlled, the negative pressure is ensured to be at a proper level, the thorns can be ensured to settle in the negative pressure box 55, and the dust can be ensured to enter the cyclone dust collector body 511 smoothly, the setting of the mesh plate 72 avoids that the dust in the negative pressure box 55 is discharged through the rectangular air inlet frame 71 after the cyclone dust collector body 511 stops, and also avoids that the external sundries enter the negative pressure box 55 through the rectangular air inlet frame 71, and the setting of the right partition plate 58 avoids that the negative pressure on the right side in the negative pressure box 55 is lost due to the rectangular air inlet frame 71.

[0067] It is worth noting that the driving motor 220, the power motor 49 and the negative pressure pump 513 disclosed in the above embodiments are all controlled to work by an external PLC controller, the control method adopts a method commonly used in the prior art, and the driving motor 220 and the power motor 49 can both be speed-adjusted.

[0068] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily implying any actual relationship or order between such entities or actions. Also, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0069] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A grass seed air screen cleaner comprising a frame (1), characterised in that, Also include: Seed screening mechanism (2) containing elastic support plate (22) and screening box frame assembly, the top of the frame (1) is connected to the four corners of the screening box frame assembly through four elastic support plates (22) respectively, the screening box frame assembly is sequentially installed with a first screening assembly, a second screening assembly, a third screening assembly and an impurity receiving inclined plate (25) from top to bottom, the rear side of the screening box frame assembly is connected with a vibration driving assembly; The pasture seed holding mechanism (3) is installed at the top left end of the frame (1), the pasture seed holding mechanism (3) is installed with a seed discharging control mechanism (4), the seed discharging control mechanism (4) is located above the first screening assembly, the seed discharging control mechanism (4) is installed with a pasture seed shell separation promoting mechanism (6); The wind screening dust removal and awn removal mechanism (5) is installed at the top right end of the frame (1); The wind screening dust removal and awn removal mechanism (5) contains a support air duct (51), a material passing through slot (53), an impurity discharging slot (54) and a negative pressure box (55), the right end of the frame (1) is provided with an impurity discharging slot (54), the bottom end of the support air duct (51) is connected to the position corresponding to the impurity discharging slot (54) at the top right end of the frame (1), the bottom left side of the support air duct (51) is provided with a material passing through slot (53), the right end of the impurity receiving inclined plate (25) extends to the inside of the material passing through slot (53), the top left side of the support air duct (51) is connected to the right end of the negative pressure box (55); The wind screening dust removal and awn removal mechanism (5) further contains a middle partition plate (56), a left partition plate (57), a right partition plate (58), a vertical air duct (59), an exhaust air duct (510) and a cyclone dust collector main body (511), the top of the negative pressure box (55) is sequentially fixedly connected to the top of the left partition plate (57), the middle partition plate (56) and the right partition plate (58) from left to right, the top of the left partition plate (57) is bent to the left, the bottom of the middle partition plate (56) is bent to the left, the left side of the negative pressure box (55) is provided with a vertical air duct (59), the top of the vertical air duct (59) is communicated with the left top of the negative pressure box (55) through an air inlet slot, one end of the exhaust air duct (510) is connected to the position between the left partition plate (57) and the middle partition plate (56) at the top of the negative pressure box (55), the other end of the exhaust air duct (510) is connected to the air inlet of the cyclone dust collector main body (511); It also includes a negative pressure box negative pressure control mechanism (7) and an awn collecting mechanism (8), the negative pressure box negative pressure control mechanism (7) contains a rectangular air inlet frame (71), a mesh plate (72) and an air inlet control sliding plate (73), the position between the middle partition plate (56) and the right partition plate (58) at the top of the negative pressure box (55) is provided with a rectangular air inlet frame (71), the bottom of the rectangular air inlet frame (71) is provided with a mesh plate (72), the top of the rectangular air inlet frame (71) is longitudinally slidably connected with two air inlet control sliding plates (73) respectively, the bottom of the negative pressure box (55) is connected with the awn collecting mechanism (8), the awn collecting mechanism (8) is located directly below the rectangular air inlet frame (71).

2. The windrowed grass seed cleaner of claim 1 wherein: The primary screening assembly contains a primary screen (26), a primary receiving chute (27) and a primary discharge cylinder (28), the screen box frame assembly is detachably mounted with a primary screen (26) on the top, a longitudinal primary receiving chute (27) is fixedly connected to the left end of the primary screen (26) on the lower side, and the front end of the primary receiving chute (27) is connected to the top of the primary discharge cylinder (28).

3. A grass seed air-screen separator according to claim 2, characterised in that: The pasture seed containing mechanism (3) comprises a fixed support rod (31), a seed hopper (32) and a discharging vertical cylinder (34), the top left end of the rack (1) is fixedly connected with two fixed support rods (31) on the front and back sides, the top of the two fixed support rods (31) is connected with the front and back sides of the seed hopper (32) respectively, and the bottom of the seed hopper (32) is provided with the discharging vertical cylinder (34).

4. A grass seed air-screen separator according to claim 3, characterised in that: The seed discharging control mechanism (4) comprises a U-shaped support (41), a pitch discharging control plate (44), a dispersion flow guide strip (46), an agitating tooth (47) and a pitch power assembly, the top of the two fixed support rods (31) is fixedly connected with the U-shaped support (41), the left end of the U-shaped support (41) is movably connected with the left end of the pitch discharging control plate (44), the back side of the pitch discharging control plate (44) is connected with the pitch power assembly, the upper surface of the pitch discharging control plate (44) is provided with the dispersion flow guide strip (46), and the right end of the pitch discharging control plate (44) is longitudinally and equidistantly provided with the agitating tooth (47).

5. A grass seed air-screen separator according to claim 4, characterised in that: The pitch power assembly comprises a power motor (49), a cam (410), an arc through slot (411), a movable column (412), a wear-resistant wheel (413) and a return spring (414), the back right end of the U-shaped support (41) is provided with the arc through slot (411), the right rear side of the pitch discharging control plate (44) is fixedly connected with the front end of the movable column (412), the movable column (412) is slidably connected with the arc through slot (411), the top end of the return spring (414) is connected with the top of the arc through slot (411), the bottom of the return spring (414) is connected with the upper side of the movable column (412), the back end of the movable column (412) is rotatably connected with the wear-resistant wheel (413), the back right end of the U-shaped support (41) is provided with the power motor (49), the output shaft of the power motor (49) is fixedly connected with the cam (410), and the bottom of the wear-resistant wheel (413) is in rolling contact with the top of the cam (410).

6. A grass seed air-screen separator according to claim 5, characterised in that: The pasture seed shell separation promoting mechanism (6) comprises a receiving arc plate (61) and a separation promoting tooth (62), the bottom right side of the vertical air duct (59) is fixedly connected with the top of the receiving arc plate (61), the center of the circle where the receiving arc plate (61) is located coincides with the center of the circle where the arc through slot (411) is located, and the left side of the receiving arc plate (61) is longitudinally and equidistantly provided with the separation promoting tooth (62), and the separation promoting tooth (62) is alternately arranged with the agitating tooth (47).

7. A grass seed air-screen separator according to claim 6, characterised in that: The grass seed shell separation promoting mechanism (6) further comprises roller frames (63), rollers (64) and separation roller protrusions (65), two roller frames (63) are fixedly connected to the front and rear sides of the bottom of the pitch unloading control plate (44), a longitudinal roller (64) is rotatably connected between the bottoms of the two roller frames (63), and separation roller protrusions (65) are uniformly arranged on the outer circumferential sides of the rollers (64).

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