Biological compound premix screening device and method

Abstract

The invention discloses a biological compound premix screening device and method, and relates to the technical field of material screening, the biological compound premix screening device comprises a screening dust-proof container, the screening dust-proof container comprises a dust-proof tank, the top of the dust-proof tank is provided with a tank cover, and the middle of the tank cover is provided with a feeding through hole; the device comprises a tank cover and further comprises a premix screening mechanism, a premix filling pretreatment mechanism and a premix pressing and dispersing transmission mechanism, the premix screening mechanism comprises a conical screen and an annular screen, a bent frame is installed on the tank cover, the end of the bent frame is rotationally connected with a vertical screening vertical shaft, the bottom end of the screening vertical shaft is fixedly connected with the center of the top of the conical screen, and the top of the conical screen is fixedly connected with the annular screen. During screening, dried and caked biological fermentation raw materials in the biological compound premix can be dispersed, and the dried and caked biological fermentation raw materials can be changed into small particles to pass through screen holes in the conical screen and the annular screen, so that the utilization rate of the biological fermentation raw materials is increased, and the screening effect is good; the quality of feed particles prepared from the biological compound premix is favorably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material screening, and in particular to a screening device and method for a biological composite premix. Background Art

[0002] Biological fermentation raw materials use microorganisms as biological fermentation agent strains, and add composite enzymes for enzymatic hydrolysis to convert raw feed materials rich in crude fibers and proteins such as cellulose, hemicellulose, pectin substances, and lignin into biological fermentation raw materials integrating microbial cell protein, bioactive small peptide amino acids, microbial active probiotics, and composite enzyme preparations.

[0003] Biological composite premix refers to a composite premix that, on the basis of a composite premix, uses dry biological fermentation raw materials as carriers and introduces biological feed additives such as immune regulatory peptides and organic trace elements to make it have biological active functions. It can not only provide sufficient trace nutrients for animals, but also, through the action of biological active substances, achieve the effects of improving animal intestinal health, enhancing animal immunity, promoting animal growth, reducing the use of antibiotics, improving reproductive performance, and the quality of meat, eggs, and milk. However, the biological fermentation raw materials in the biological composite premix are prone to agglomeration after drying, resulting in a large amount of agglomerated biological fermentation raw materials unable to pass through the sieve holes during the screening of the biological composite premix, affecting the utilization rate of the biological fermentation raw materials. If the biological composite premix is directly made into feed pellets without screening, due to the presence of agglomerated biological fermentation raw materials, the distribution of biological fermentation raw materials and other feed raw materials in the feed pellets will be uneven, and there are also likely to be other impurities, affecting the quality of the feed pellets. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a screening device and method for a biological composite premix. During screening, the agglomerated biological fermentation raw materials in the biological composite premix can be dispersed, facilitating the agglomerated biological fermentation raw materials after drying to become small particles and pass through the sieve holes on the conical sieve and the annular sieve, thereby improving the utilization rate of the biological fermentation raw materials. Since the biological fermentation raw materials become fine particles during screening, the distribution of biological fermentation raw materials and other feed raw materials in the biological composite premix is relatively uniform, the impurities in the biological composite premix can be screened out and discharged, and the screening effect is good, which is beneficial to improving the quality of feed pellets made from the biological composite premix, and can effectively solve the problems in the background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A screening device for a biological composite premix, including a screening dust-proof container, the screening dust-proof container includes a dust-proof tank, the top of the dust-proof tank is provided with a tank cover, and a feed through hole is opened in the middle of the tank cover. It further includes: The premix screening mechanism includes a conical screen and an annular screen. A bent frame is installed on the tank cover. The end of the bent frame is rotatably connected to a vertical screening vertical shaft, and the bottom end of the screening vertical shaft is fixedly connected to the top center of the conical screen. An annular screen is integrally formed and connected to the outer peripheral side of the conical screen. The top of the screening vertical shaft is connected to a rotary power assembly; The premix filling and pretreatment mechanism is installed on the lower side of the tank cover; The premix crushing and transmission mechanism is installed on the tank cover. The bottom of the premix crushing and transmission mechanism is fixedly connected to a premix crushing and execution mechanism, and the premix crushing and execution mechanism is located above the conical screen.

[0006] During screening, the bio - composite premix to be screened is added into the premix filling and pretreatment mechanism through the feed through - hole. The premix filling and pretreatment mechanism conducts preliminary dispersion work on the bio - composite premix. Then the bio - composite premix falls onto the upper side of the conical screen. The rotary power assembly drives the screening vertical shaft, the conical screen, and the annular screen to rotate counterclockwise. Due to the rotation of the conical screen and the annular screen, the bio - composite premix is prone to move relative to the conical screen and the annular screen, making it easy for the bio - composite premix to pass through the screen holes on the conical screen and the annular screen, and the screening effect is good. When the screening vertical shaft rotates, it can drive the premix crushing and execution mechanism to reciprocate up and down through the premix crushing and transmission mechanism. When the premix crushing and execution mechanism moves downward, it can squeeze the bio - composite premix on the conical screen, which is beneficial for the dried and agglomerated bio - fermentation raw materials in the bio - composite premix to become small particles. When the premix crushing and execution mechanism squeezes the bio - composite premix downward, the conical screen still rotates, which is also beneficial for rubbing and dispersing the bio - composite premix and facilitating the bio - composite premix to pass through the screen holes on the conical screen. The bio - composite premix that does not pass through the screen holes on the conical screen falls onto the upper side of the annular screen due to gravity and the centrifugal force during the rotation of the conical screen, and then is screened through the screen holes on the annular screen. Since the screening process is carried out inside the dust - proof tank, it is relatively airtight. Only the feed through - hole is the open area, and there is the addition of bio - composite premix in the feed through - hole. Therefore, a large amount of dust will not be raised, and the site can be kept clean.

[0007] Further, the premix feeding and pretreatment mechanism includes a feeding hopper. The lower side of the tank cover is detachably connected to the top of the feeding hopper, and the feed through-hole is arranged corresponding to the top opening of the feeding hopper up and down. The bottom of the feeding hopper is integrally formed and connected to the top end of the pretreatment cylinder. A plurality of dispersion stirring pieces are annularly arranged at the bottom end of the pretreatment cylinder. The bottom of the screening vertical shaft passes through the center of the pretreatment cylinder, and a dispersion feeding screw is fixedly connected to the outer peripheral side of the screening vertical shaft corresponding to the position of the pretreatment cylinder. The biological composite premix added from the feed through-hole first falls into the feeding hopper and then enters the top of the pretreatment cylinder. When the screening vertical shaft rotates counterclockwise, it drives the dispersion feeding screw to rotate counterclockwise. The dispersion feeding screw can control the falling speed of the biological composite premix in the pretreatment cylinder to a certain extent, and at the same time, it can also break and disperse the agglomerated biological fermentation raw materials. Then the biological composite premix falls on the upper middle part of the conical screen. When the biological composite premix rotates with the conical screen, it will encounter the dispersion stirring pieces at the bottom of the pretreatment cylinder and be stirred and dispersed by the dispersion stirring pieces, and then slide down along the inclined surface on the upper side of the conical screen and is initially screened by the upper middle area of the conical screen.

[0008] Further, the premix feeding and pretreatment mechanism also includes a dispersion movable column and a dispersion fixed column. A first collar is sleeved on the screening vertical shaft corresponding to the middle part of the feeding hopper. A plurality of dispersion movable columns are annularly arranged on the outer peripheral side of the first collar, and a plurality of dispersion fixed columns are annularly arranged on the inner side of the feeding hopper. When the screening vertical shaft rotates, it drives the dispersion movable columns to rotate through the first collar. The dispersion movable columns and the dispersion fixed columns can stir and disperse the agglomerated parts in the biological composite premix.

[0009] Further, the premix crushing and dispersing execution mechanism includes a reciprocating crushing and dispersing conical sleeve. The reciprocating crushing and dispersing conical sleeve is located above the conical screen. A plurality of crushing and rubbing teeth are annularly arranged on the lower side of the reciprocating crushing and dispersing conical sleeve. An installation convex ring is fixedly connected to the upper side of the reciprocating crushing and dispersing conical sleeve, and a feed guiding conical sleeve is integrally formed at the top of the reciprocating crushing and dispersing conical sleeve. When the screening vertical shaft rotates, it drives the installation convex ring to reciprocate up and down through the premix crushing and dispersing transmission mechanism. The installation convex ring drives the reciprocating crushing and dispersing conical sleeve, the feed guiding conical sleeve and the crushing and rubbing teeth to reciprocate up and down. The setting of the feed guiding conical sleeve facilitates the biological composite premix sliding down along the inclined surface on the upper side of the conical screen to enter the area between the conical screen and the reciprocating crushing and dispersing conical sleeve. When the reciprocating crushing and dispersing conical sleeve moves downward, it cooperates with the crushing and rubbing teeth to extrude the biological composite premix. And when the reciprocating crushing and dispersing conical sleeve moves downward, since the conical screen is still rotating, the crushing and rubbing teeth and the conical screen cooperate to rub and disperse the biological composite premix, so that the biological composite premix is fully processed into small particles and then screened.

[0010] Furthermore, the premix crushing transmission mechanism includes a control ring, two protective guide sleeves fixedly connected to the tank cover, two sliding columns vertically slidingly connected in the two protective guide sleeves, the bottom ends of the two sliding columns are fixedly connected to the mounting convex rings, and the top ends of the two sliding columns are fixedly connected to two top plates, the parts of the sliding columns located between the protective guide sleeves and the top plates are respectively sleeved with return springs, a universal ball seat is respectively installed on the top of each top plate, a universal ball is installed on the top of the universal ball seat, the top of the screening vertical shaft is fixedly sleeved with a second ring, the outer peripheral side of the second ring is fixedly connected to the control ring through three spokes, the bottom annular array of the control ring is provided with six arc-shaped protrusions, and the bottom surface of the control ring is rollingly connected to the top of the universal ball. When the vertical screening shaft rotates, the control ring is driven to rotate through the second sleeve ring and the spoke rod. When the arc-shaped protrusion at the bottom of the control ring encounters the universal ball, the universal ball seat, top plate and sliding column can be pushed down relative to the protective guide sleeve through the universal ball, which can drive the installation convex ring to move down. At this time, the reset spring is compressed by the top plate, and the control ring continues to rotate. When the arc-shaped protrusion at the bottom of the control ring is separated from the rolling contact with the top of the universal ball, the reset spring resets and extends, pushing the universal ball seat, top plate and sliding column to move up relative to the protective guide sleeve, driving the installation convex ring to move up. Therefore, as the vertical screening shaft and the control ring rotate, the reciprocating pressing cone sleeve, the feed guide cone sleeve and the pressing and rolling teeth are driven to reciprocate up and down through the installation convex ring.

[0011] Furthermore, it also includes a debris discharge mechanism, which includes an arc door panel, a side of the dustproof tank is provided with a discharge slot at the upper side of the annular screen, the bottom surface of the discharge slot is flush with the upper side of the annular screen, a discharge shaft is rotatably connected to one side of the discharge slot, the portion of the discharge shaft located in the discharge slot is fixedly connected to one end of the arc door panel, and a sealing strip is installed at the other end of the arc door panel, the dustproof tank is provided with a motor chamber at the lower side of the discharge slot, a discharge motor is installed in the motor chamber, and the output shaft of the discharge motor is fixedly connected to the bottom end of the discharge shaft. During the screening process, the arc door panel closes the discharge slot, and the sealing strip can close the redundant gap between the end of the arc door panel and the discharge slot. After the screening is completed, impurities that cannot pass through the sieve holes of the conical screen and the annular screen need to be removed. At this time, the discharge motor drives the discharge shaft to rotate clockwise, and the discharge shaft drives the arc door panel to rotate, opening the discharge slot, and the impurities on the annular screen can be removed through the discharge slot.

[0012] Further, it further includes a premix crushing and guiding mechanism, which includes a crushing and guiding plate and crushing blades. One end of the arc-shaped door plate close to the discharge shaft is fixedly connected to one end of the crushing and guiding plate. A plurality of crushing blades are arranged at equal intervals on the side of the crushing and guiding plate away from the arc-shaped door plate. When the arc-shaped door plate closes the discharge through groove, the biological composite premix on the annular screen will encounter the obliquely arranged crushing and guiding plate as the annular screen rotates, and then hit the crushing blades on the crushing and guiding plate and be further crushed and refined. Then, the crushing and guiding plate guides the biological composite premix on the annular screen to the upper side of the conical screen, so that the crushed and refined biological composite premix passes through the sieve holes on the conical screen and the annular screen again for screening. The screening is sufficient and effective, and the large impurities that cannot be screened finally remain on the annular screen. After the screening is completed, the rotary power assembly drives the screening vertical shaft to rotate clockwise, the discharge motor drives the discharge shaft to rotate clockwise by 20 degrees, the arc-shaped door plate opens the discharge through groove. Due to the centrifugal force, the large impurities on the upper side of the annular screen are located at the outer edge of the upper side of the annular screen. The large impurities remaining on the annular screen rotate clockwise and encounter the outer side of the crushing and guiding plate, and are guided by the crushing and guiding plate to be discharged from the discharge through groove.

[0013] Further, it further includes an annular screen cleaning mechanism, which includes a cleaning brush. A groove is opened at the bottom of the crushing and guiding plate. The bottom of the groove is vertically slidably connected to a sliding plate. The bottom of the sliding plate is fixedly connected to the cleaning brush. The bristles at the bottom of the cleaning brush are in contact with the upper side of the annular screen. A compression spring is installed at the top of the groove, and the bottom end of the compression spring is connected to the top of the sliding plate. The elastic force of the compression spring pushes the sliding plate to move downward relative to the crushing and guiding plate, so that the cleaning brush at the bottom of the sliding plate presses against the upper side of the annular screen. As the annular screen rotates, the cleaning brush cleans the sieve holes on the annular screen to prevent the sieve holes on the annular screen from being blocked and maintain the screening effect of the annular screen.

[0014] Further, the screening and dust-proof container further includes a collecting hopper. A collecting hopper is fixedly connected at a position below the annular screen in the dust-proof tank. The center of the bottom of the collecting hopper is connected to the top end of a discharge pipe. The bottom end of the discharge pipe extends to the outside of the dust-proof tank, and a butterfly valve is installed at the bottom end of the discharge pipe. An air-driven sieve hole dredging mechanism is installed on the outer side of the dust-proof tank. The air outlet of the air-driven sieve hole dredging mechanism is connected to a position between the annular screen and the collecting hopper in the dust-proof tank. The fine particles of the biological composite premix screened out fall into the collecting hopper and are gathered together. The butterfly valve is opened, and the fine particles of the biological composite premix in the collecting hopper are discharged through the discharge pipe. When a large number of sieve holes on the conical screen are blocked, the butterfly valve can be closed, and the air-driven sieve hole dredging mechanism quickly releases air into the area between the annular screen and the collecting hopper in the dust-proof tank. The air quickly passes through the sieve holes on the conical screen and the annular screen from bottom to top, and can dredge the sieve holes on the conical screen and the annular screen.

[0015] A screening method of a biocomposite premix screening device comprises the following steps: Step 1: Add the biocomposite premix to be screened into the filling hopper of the premix filling and pretreatment mechanism through the feed through-hole, then the rotating power assembly drives the screening vertical shaft, the conical screen and the annular screen to rotate counterclockwise, and the screening vertical shaft drives the dispersing movable column to rotate in the filling hopper, cooperating with the dispersing fixed column to disperse the agglomerated biocomposite premix; Step 2: The biocomposite premix enters the pretreatment cylinder, and the screening vertical shaft drives the dispersion and filling screw to rotate counterclockwise. The dispersion and filling screw drives the biocomposite premix in the pretreatment cylinder to be transported downward, while further dispersing the agglomerated biocomposite premix; Step 3: The biocomposite premix that falls into the center of the conical screen rotates counterclockwise as the conical screen rotates, thereby being moved by the dispersion paddle and gradually sliding down the upper slope of the conical screen, entering the area between the feed guide cone sleeve and the conical screen, and then entering the area between the reciprocating dispersion cone sleeve and the conical screen; Step 4: When the screening vertical shaft rotates counterclockwise, the reciprocating pressing and dispersing cone sleeve is driven to reciprocate up and down through the premix pressing and dispersing transmission mechanism. When the reciprocating pressing and dispersing cone sleeve moves downward, the biocomposite premix is squeezed with the help of the dispersing teeth. As the conical screen rotates counterclockwise, the dispersing teeth and the conical screen cooperate to disperse the biocomposite premix. Step 5: the biocomposite premix is sieved through the sieve holes on the conical sieve, and then the unsieved biocomposite premix falls onto the annular sieve and is sieved again through the sieve holes on the annular sieve; Step 6: As the annular screen rotates counterclockwise, the biocomposite premix on the annular screen hits the crushing blades on the crushing guide plate, causing the biocomposite premix to break. At the same time, the crushed biocomposite premix is guided by the crushing guide plate to fall onto the conical screen, promoting the biocomposite premix to pass through the sieve holes on the conical screen and the annular screen; Step seven: After the screening is completed, the rotating power assembly drives the screening vertical axis to rotate clockwise, the discharge motor drives the discharge axis to rotate 20 degrees clockwise, the arc door panel opens the discharge slot, and the large impurities remaining on the annular screen rotate clockwise and encounter the smashing guide plate, which guides them to be discharged from the discharge slot.

[0016] Compared with the existing technology, the beneficial effects of the biocomposite premix screening device and method are: 1. Add the biological composite premix to be screened into the premix feeding and pretreatment mechanism through the feeding through-hole. The premix feeding and pretreatment mechanism conducts preliminary dispersion work on the biological composite premix, and then the biological composite premix falls to the upper side of the conical screen. The rotating power assembly drives the screening vertical shaft, conical screen, and annular screen to rotate counterclockwise. Due to the rotation of the conical screen and annular screen, the biological composite premix is prone to move relative to the conical screen and annular screen, and it is easy for the biological composite premix to pass through the sieve holes on the conical screen and annular screen, resulting in good screening effect.

[0017] 2. When the screening vertical shaft rotates, it can drive the premix crushing actuator to reciprocate up and down through the premix crushing transmission mechanism. When the premix crushing actuator moves downward, it can extrude the biological composite premix on the conical screen, which is beneficial for the biologically fermented raw materials that agglomerate after drying in the biological composite premix to become small particles. When the premix crushing actuator extrudes the biological composite premix downward, the conical screen still rotates, which is also beneficial for rubbing and dispersing the biological composite premix, facilitating the biological composite premix to pass through the sieve holes on the conical screen. The biological composite premix that does not pass through the sieve holes on the conical screen falls to the upper side of the annular screen due to gravity and the centrifugal force during the rotation of the conical screen, and then is screened through the sieve holes on the annular screen.

[0018] 3. When the arc-shaped door panel closes the discharge through-channel, the biological composite premix on the annular screen will encounter the inclined crushing guide plate when rotating with the annular screen, and then hit the crushing blades on the crushing guide plate and be further crushed and refined. Then, the crushing guide plate guides the biological composite premix on the annular screen to the upper side of the conical screen, enabling the crushed and refined biological composite premix to pass through the sieve holes on the conical screen and annular screen again for screening. The screening is sufficient and effective, and the large impurities that cannot be screened finally remain on the annular screen.

[0019] 4. After screening is completed, the rotating power assembly drives the screening vertical shaft to rotate clockwise, and the discharge motor drives the discharge shaft to rotate clockwise by 20 degrees. The arc-shaped door panel opens the discharge through-channel. Due to centrifugal force, the large impurities on the upper side of the annular screen are located at the outer edge of the upper side of the annular screen. The large impurities remaining on the annular screen rotate clockwise and encounter the outer side of the crushing guide plate, and are guided by the crushing guide plate to be discharged from the discharge through-channel.

[0020] 5. During screening, the biologically fermented raw materials that agglomerate after drying in the biological composite premix can be dispersed, which is beneficial for the biologically fermented raw materials that agglomerate after drying to become small particles and pass through the sieve holes on the conical screen and annular screen, thereby improving the utilization rate of the biologically fermented raw materials. Since the biologically fermented raw materials become fine particles during screening, the distribution of the biologically fermented raw materials and other feed raw materials in the biological composite premix is relatively uniform. The impurities in the biological composite premix can be screened out and discharged, and the screening effect is good, which is beneficial for improving the quality of the feed pellets made from the biological composite premix. Description of the Drawings

[0021] Figure 1 This is a schematic structural diagram of the screening device for the biological composite premix of the present invention; Figure 2 For the screening device of the biological composite premix of the present invention Figure 1 The partial enlarged structural schematic diagram at position A in it; Figure 3 This is a top-view structural schematic diagram of the screening device for the biological composite premix of the present invention; Figure 4 For the screening device of the biological composite premix of the present invention Figure 3 The sectional structural schematic diagram at position B in it; Figure 5 For the screening device of the biological composite premix of the present invention Figure 4 The partial enlarged structural schematic diagram at position C in it; Figure 6 For the screening device of the biological composite premix of the present invention Figure 4 The partial enlarged structural schematic diagram at position D in it; Figure 7 This is a partial structural schematic diagram of the screening device for the biological composite premix of the present invention Figure 1 ; Figure 8 This is a partial structural schematic diagram of the screening device for the biological composite premix of the present invention Figure 2 ; Figure 9 For the screening device of the biological composite premix of the present invention Figure 8 The partial enlarged structural schematic diagram at position E in it; Figure 10 This is a partial structural schematic diagram of the screening device for the biological composite premix of the present invention Figure 3 ; In the figure: 1 - screening dust-proof container, 11 - dust-proof tank, 12 - tank cover, 13 - feed through hole, 14 - rear baffle, 15 - thickened seat plate, 16 - aggregate hopper, 17 - discharge pipe, 18 - butterfly valve, 2 - premix screening mechanism, 21 - bent frame, 22 - screening vertical shaft, 23 - conical screen, 24 - annular screen, 25 - driven sprocket, 26 - chain, 27 - driving sprocket, 28 - screening motor, 3 - premix filling pretreatment mechanism, 31 - flange ring, 32 - bolt, 33 - filling hopper, 34 - pretreatment cylinder, 35 - dispersing stirring piece, 36 - dispersing filling screw, 37 - collar one, 38 - fastening screw, 39 - dispersing movable column, 310 - dispersing fixed column, 4 - premix compacting transmission mechanism, 41 - protective guide sleeve, 42 - sliding column, 43 - return spring, 44 - top plate, 45 - universal ball seat, 46 - universal ball, 47 - collar two, 48 - spoke rod, 49 - control ring, 410 - arc-shaped protrusion, 5 - premix compacting execution mechanism, 51 - mounting convex ring, 52 - reciprocating compacting conical sleeve, 53 - feed guiding conical sleeve, 54 - compacting rubbing teeth, 6 - debris discharging mechanism, 61 - discharge through groove, 62 - discharge shaft, 63 - discharge motor, 64 - sealing strip, 65 - motor chamber, 66 - arc-shaped door panel, 7 - premix crushing guiding mechanism, 71 - crushing guiding plate, 72 - crushing blade, 8 - annular screen cleaning mechanism, 81 - groove, 82 - slide plate, 83 - chute, 84 - slider, 85 - cleaning brush, 86 - compression spring, 9 - pneumatic sieve hole dredging mechanism, 91 - air pump, 92 - conveying air pipe, 93 - tank ring, 94 - compressed air tank, 95 - air valve, 96 - pressurizing air pipe. Specific implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Example 1, please refer to Figures 1 to 10 , this embodiment provides a technical solution: a biological composite premix screening device, including a screening dust-proof container 1, the screening dust-proof container 1 includes a dust-proof tank 11, a tank cover 12 and a feed through hole 13. The tank cover 12 is installed on the top of the dust-proof tank 11, and a feed through hole 13 is opened in the middle of the tank cover 12. It also includes a premix screening mechanism 2, a premix filling pretreatment mechanism 3, a premix compacting transmission mechanism 4 and a premix compacting execution mechanism 5.

[0024] The premix screening mechanism 2 includes a bent frame 21, a screening vertical shaft 22, a conical screen 23, an annular screen 24 and a rotating power component. The bent frame 21 is installed on the tank cover 12. The end of the bent frame 21 is rotatably connected to the vertical screening vertical shaft 22 through a bearing. The screening vertical shaft 22 is located in the center of the dustproof tank 11, and the bottom end of the screening vertical shaft 22 is fixedly connected to the top center of the conical screen 23. The outer peripheral side of the conical screen 23 is integrally connected with the annular screen 24. The outer diameter of the annular screen 24 is slightly smaller than the inner diameter of the dustproof tank 11. The top of the screening vertical shaft 22 is connected to the rotating power component.

[0025] The bottom end of the bent frame 21 is fixedly connected to a thickened seat plate 15 , which is fixedly connected to the upper side of the tank cover 12 by seat plate bolts. The bent frame 21 is stably mounted on the tank cover 12 with the help of the thickened seat plate 15 .

[0026] The rotating power assembly includes a driven sprocket 25, a chain 26, a driving sprocket 27, and a screening motor 28. The driven sprocket 25 is installed on the top of the screening vertical shaft 22, and the screening motor 28 is installed on the curved frame 21. The output shaft of the screening motor 28 is installed with a driving sprocket 27. The driving sprocket 27 is connected to the driven sprocket 25 through the chain 26. When the screening motor 28 works, the screening vertical shaft 22 is driven to rotate relative to the curved frame 21 through the transmission of the driven sprocket 25, the chain 26 and the driving sprocket 27.

[0027] The premix filling and pretreatment mechanism 3 is installed on the lower side of the tank cover 12 .

[0028] The premix filling pretreatment mechanism 3 includes a filling hopper 33, a pretreatment barrel 34, a dispersing toggle piece 35 and a dispersing filling screw 36. The lower side of the tank cover 12 is detachably connected to the top of the filling hopper 33, and the feed through hole 13 is arranged correspondingly to the top opening of the filling hopper 33. The bottom of the filling hopper 33 is integrally formed and connected to the top of the pretreatment barrel 34. The bottom end of the pretreatment barrel 34 is provided with a plurality of dispersing toggle pieces 35 in a circular array. There are four dispersing toggle pieces 35. The bottom of the dispersing toggle piece 35 is close to the middle upper surface of the conical screen 23. The bottom of the screening vertical axis 22 passes through the center of the pretreatment barrel 34. The outer peripheral side of the screening vertical axis 22 is fixedly connected to the position of the pretreatment barrel 34.

[0029] Specifically, the premix filling and pretreatment mechanism 3 further includes a flange ring 31 and bolts 32 . The top of the filling hopper 33 is fixedly connected with the flange ring 31 , and the flange ring 31 is fixedly connected to the lower side of the tank cover 12 via six bolts 32 .

[0030] The bio - composite premix added from the feed through - hole 13 first falls into the filling hopper 33, and then enters the top of the pretreatment cylinder 34. When the screening vertical shaft 22 rotates counter - clockwise, it drives the dispersion filling screw 36 to rotate counter - clockwise. The dispersion filling screw 36 can, to a certain extent, control the falling speed of the bio - composite premix in the pretreatment cylinder 34, and at the same time, it can also break and disperse the agglomerated bio - fermentation raw materials. Then the bio - composite premix falls to the middle part on the upper side of the conical screen 23. When the bio - composite premix rotates with the conical screen 23, it will encounter the dispersion deflecting piece 35 at the bottom of the pretreatment cylinder 34, and is deflected and dispersed by the dispersion deflecting piece 35, and then slides down along the inclined plane on the upper side of the conical screen 23, and the initial screening work is carried out by the middle area on the upper side of the conical screen 23.

[0031] The premix filling and pretreatment mechanism 3 further includes a first collar 37, fastening screws 38, dispersion movable columns 39 and dispersion fixed columns 310. A first collar 37 is sleeved at the position corresponding to the middle of the filling hopper 33 on the screening vertical shaft 22. The first collar 37 is fixedly connected to the screening vertical shaft 22 through the fastening screws 38. A plurality of dispersion movable columns 39 are arranged in an annular array on the outer peripheral side of the first collar 37, and a plurality of dispersion fixed columns 310 are arranged in an annular array on the inner side of the filling hopper 33. The number of both the dispersion movable columns 39 and the dispersion fixed columns 310 is three, and both the dispersion movable columns 39 and the dispersion fixed columns 310 are distributed along the radial direction of the screening vertical shaft 22. When the screening vertical shaft 22 rotates, it drives the dispersion movable columns 39 to rotate through the first collar 37, and the dispersion movable columns 39 cooperate with the dispersion fixed columns 310 to disperse the agglomerated part in the bio - composite premix.

[0032] The premix dispersion driving mechanism 4 is installed on the tank cover 12, and the top of the premix dispersion driving mechanism 4 is connected to the top of the screening vertical shaft 22. The bottom of the premix dispersion driving mechanism 4 is fixedly connected to a premix dispersion executing mechanism 5, and the premix dispersion executing mechanism 5 is located above the conical screen 23.

[0033] The premix dispersing actuator 5 includes a mounting convex ring 51, a reciprocating dispersing conical sleeve 52, a feed guiding conical sleeve 53 and dispersing teeth 54. The reciprocating dispersing conical sleeve 52 is located on the upper side of the conical screen 23, and the center of the reciprocating dispersing conical sleeve 52 coincides with the center of the conical screen 23. The lower annular array of the reciprocating dispersing conical sleeve 52 is provided with a plurality of dispersing teeth 54, and the number of dispersing teeth 54 is selected according to needs. The upper side of the reciprocating dispersing conical sleeve 52 is fixedly connected with the mounting convex ring 51, and the top of the reciprocating dispersing conical sleeve 52 is integrally connected with the feed guiding conical sleeve 53. The dispersing paddle 35 is located on the inner side of the feed guiding conical sleeve 53, and the shortest distance between the top of the feed guiding conical sleeve 53 and the conical screen 23 is greater than the shortest distance between the bottom and the conical screen 23. When the screening vertical shaft 22 rotates, the premix crushing transmission mechanism 4 drives the mounting convex ring 51 to reciprocate up and down, and the mounting convex ring 51 drives the reciprocating crushing cone sleeve 52, the feed guide cone sleeve 53 and the crushing teeth 54 to reciprocate up and down. The setting of the feed guide cone sleeve 53 facilitates the biocomposite premix sliding down the upper inclined surface of the conical screen 23 to enter the area between the conical screen 23 and the reciprocating crushing cone sleeve 52. When the reciprocating crushing cone sleeve 52 moves downward, it cooperates with the crushing teeth 54 to extrude the biocomposite premix. When the reciprocating crushing cone sleeve 52 moves downward, since the conical screen 23 is still rotating, the crushing teeth 54 and the conical screen 23 can cooperate to crush the biocomposite premix, so that the biocomposite premix is fully processed into small particles for screening.

[0034] The premix crushing transmission mechanism 4 includes a protective guide sleeve 41, a slide column 42, a return spring 43, a top plate 44, a universal ball seat 45, a universal ball 46, a second collar 47, a spoke 48, a control ring 49 and an arc-shaped protrusion 410. Two protective guide sleeves 41 are fixedly connected to the tank cover 12. The two protective guide sleeves 41 are symmetrically arranged about the center of the tank cover 12. Two slide columns 42 are vertically slidably connected in the two protective guide sleeves 41. The bottom ends of the two slide columns 42 are fixedly connected to the mounting convex ring 51, and the top ends of the two slide columns 42 are fixedly connected to the mounting convex ring 51. There are two top plates 44 connected, and the parts of the sliding column 42 located between the protective guide sleeve 41 and the top plate 44 are respectively sleeved with a return spring 43. A universal ball seat 45 is installed on the top of each top plate 44, and a universal ball 46 is installed on the top of the universal ball seat 45. The top of the screening vertical shaft 22 is fixedly sleeved with a ring 2 47, and the outer peripheral side of the ring 2 47 is fixedly connected to a control ring 49 through three spokes 48. The bottom annular array of the control ring 49 is provided with six arc-shaped protrusions 410, and the bottom surface of the control ring 49 is rollingly connected to the top of the universal ball 46.

[0035] The provision of the protective guide sleeve 41 can prevent the biological composite premix from entering the gap between the sliding column 42 and the tank cover 12 when it is added into the feed through hole 13. A semi-circular rear baffle 14 is fixedly connected to one side of the feed through hole 13 close to the screening motor 28. The two ends of the rear baffle 14 are close to the two protective guide sleeves 41. The biological composite premix is added from the side of the feed through hole 13 far from the screening motor 28, and when it is added into the feed through hole 13, it can prevent the biological composite premix from overflowing from the side close to the screening motor 28.

[0036] When the screening vertical shaft 22 rotates, it drives the control ring 49 to rotate through the collar two 47 and the spoke rod 48. When the arc-shaped protrusion 410 at the bottom of the control ring 49 encounters the universal ball 46, it can push the universal ball seat 45, the top plate 44 and the sliding column 42 to move downward relative to the protective guide sleeve 41 through the universal ball 46, and then drive the mounting collar 51 to move downward. At this time, the return spring 43 is compressed by the top plate 44. When the control ring 49 continues to rotate and the arc-shaped protrusion 410 at the bottom of the control ring 49 disengages from the rolling contact with the top of the universal ball 46, the return spring 43 resets and elongates, pushing the universal ball seat 45, the top plate 44 and the sliding column 42 to move upward relative to the protective guide sleeve 41, driving the mounting collar 51 to move upward. Thus, as the screening vertical shaft 22 and the control ring 49 rotate, the reciprocating dispersion conical sleeve 52, the feed guiding conical sleeve 53 and the dispersion rubbing teeth 54 are driven to move up and down reciprocally through the mounting collar 51.

[0037] The screening dust-proof container 1 further includes an aggregate hopper 16, a discharge pipe 17 and a butterfly valve 18. An aggregate hopper 16 is fixedly connected to the position below the annular screen 24 in the dust-proof tank 11. The center of the bottom of the aggregate hopper 16 is connected to the top end of the discharge pipe 17. The bottom end of the discharge pipe 17 extends to the outside of the dust-proof tank 11, and a butterfly valve 18 is installed at the bottom end of the discharge pipe 17. A pneumatic screen hole dredging mechanism 9 is installed on the outside of the dust-proof tank 11, and the air outlet of the pneumatic screen hole dredging mechanism 9 is connected to the position of the dust-proof tank 11 between the annular screen 24 and the aggregate hopper 16. The fine particles of the screened biological composite premix fall into the aggregate hopper 16 and are gathered together. When the butterfly valve 18 is opened, the fine particles of the biological composite premix in the aggregate hopper 16 are discharged through the discharge pipe 17. When a large number of screen holes on the conical screen 23 are blocked, the butterfly valve 18 can be closed, and the pneumatic screen hole dredging mechanism 9 quickly releases air into the area of the dust-proof tank 11 between the annular screen 24 and the aggregate hopper 16. The air quickly passes through the screen holes on the conical screen 23 and the annular screen 24 from bottom to top, and the screen holes on the conical screen 23 and the annular screen 24 can be dredged.

[0038] Specifically, the pneumatic sieve hole dredging mechanism 9 includes an air pump 91, a delivery air pipe 92, a tank ring 93, a compressed air tank 94, an air valve 95, and a pressurized air pipe 96. The side of the dust-proof tank 11 is installed with the compressed air tank 94 through the tank ring 93. The top of the compressed air tank 94 is connected to one end of the pressurized air pipe 96 through the air valve 95. The other end of the pressurized air pipe 96 extends to the area between the annular sieve 24 and the aggregate hopper 16 inside the dust-proof tank 11. The bottom of the compressed air tank 94 is connected to one end of the delivery air pipe 92. The other end of the delivery air pipe 92 is connected to the air outlet of the air pump 91 through a one-way valve. The one-way valve only allows the air pump 91 to send air to the delivery air pipe 92 and the compressed air tank 94. By means of the air pump 91, the one-way valve, and the delivery air pipe 92, air is sent to the compressed air tank 94, enabling the compressed air tank 94 to store compressed gas. When the sieve holes need to be dredged, the air valve 95 is opened, and the compressed air in the compressed air tank 94 enters the area between the annular sieve 24 and the aggregate hopper 16 inside the dust-proof tank 11 through the pressurized air pipe 96.

[0039] During screening, the biological composite premix to be screened is added into the premix filling and pretreatment mechanism 3 through the feed through hole 13. The premix filling and pretreatment mechanism 3 performs preliminary dispersion work on the biological composite premix. Then, the biological composite premix falls to the upper side of the conical sieve 23. The rotary power assembly drives the screening vertical shaft 22, the conical sieve 23, and the annular sieve 24 to rotate counterclockwise. Due to the rotation of the conical sieve 23 and the annular sieve 24, the biological composite premix is prone to move relative to the conical sieve 23 and the annular sieve 24, facilitating the biological composite premix to pass through the sieve holes on the conical sieve 23 and the annular sieve 24, resulting in good screening effect. When the screening vertical shaft 22 rotates, it can drive the premix crushing actuator 5 to reciprocate up and down through the premix crushing transmission mechanism 4. When the premix crushing actuator 5 moves downward, it can extrude the biological composite premix on the conical sieve 23, which is beneficial for the dried and agglomerated biological fermentation raw materials in the biological composite premix to become small particles. When the premix crushing actuator 5 extrudes the biological composite premix downward, the conical sieve 23 still rotates, which is also beneficial for dispersing the biological composite premix and facilitating the biological composite premix to pass through the sieve holes on the conical sieve 23. The biological composite premix that does not pass through the sieve holes on the conical sieve 23 falls to the upper side of the annular sieve 24 due to gravity and the centrifugal force during the rotation of the conical sieve 23. After being screened by the sieve holes on the annular sieve 24, since the screening process is carried out inside the dust-proof tank 11, it is relatively airtight. Only the feed through hole 13 is an open area, and the addition of the biological composite premix is maintained in the feed through hole 13. Therefore, a large amount of dust will not be raised, and the site can be kept clean.

[0040] Example 2, please refer to Figures 1 to 10 , this example provides a technical solution: a biological composite premix screening device. This example is generally the same as that of Example 1, and the difference lies in: It further includes a sundry discharge mechanism 6, which comprises a discharge through groove 61, a discharge shaft 62, a discharge motor 63, a sealing strip 64, a motor chamber 65 and an arc-shaped door panel 66. A discharge through groove 61 is formed in the side of the dust-proof tank 11 at a position above the annular screen 24. The bottom surface of the discharge through groove 61 is flush with the upper side of the annular screen 24. One side inside the discharge through groove 61 is rotatably connected with a discharge shaft 62. The part of the discharge shaft 62 located inside the discharge through groove 61 is fixedly connected to one end of the arc-shaped door panel 66. A sealing strip 64 is installed at the other end of the arc-shaped door panel 66. A motor chamber 65 is arranged at the position of the dust-proof tank 11 below the discharge through groove 61. A discharge motor 63 is installed inside the motor chamber 65. The output shaft of the discharge motor 63 is fixedly connected to the bottom end of the discharge shaft 62. During the screening process, the arc-shaped door panel 66 closes the discharge through groove 61, and the sealing strip 64 can seal the redundant gap between the end of the arc-shaped door panel 66 and the discharge through groove 61. After the screening is completed, the impurities that cannot pass through the sieve holes of the conical screen 23 and the annular screen 24 need to be taken out. At this time, the discharge motor 63 drives the discharge shaft 62 to rotate clockwise, and the discharge shaft 62 drives the arc-shaped door panel 66 to rotate, opening the discharge through groove 61, and the impurities on the annular screen 24 can be taken out through the discharge through groove 61.

[0041] Embodiment 3. Please refer to Figures 1 to 10 , this embodiment provides a technical solution: a biological composite premix screening device. This embodiment is substantially the same as that of Embodiment 2, and the difference lies in: It further includes a premix crushing and guiding mechanism 7, which comprises a crushing and guiding plate 71 and crushing blades 72. One end of the inner side of the arc-shaped door panel 66 close to the discharge shaft 62 is fixedly connected to one end of the crushing and guiding plate 71. A plurality of crushing blades 72 are arranged at equal distances on the side of the crushing and guiding plate 71 away from the arc-shaped door panel 66. The included angle between the crushing and guiding plate 71 and the arc-shaped door panel 66 is set at 40 degrees. When the arc-shaped door panel 66 closes the discharge through groove 61, the biological composite premix on the annular screen 24 will encounter the inclined crushing and guiding plate 71 when rotating with the annular screen 24, and then hit the crushing blades 72 on the crushing and guiding plate 71 and be further crushed and refined. Then the crushing and guiding plate 71 guides the biological composite premix on the annular screen 24 to the upper side of the conical screen 23, so that the crushed and refined biological composite premix passes through the sieve holes of the conical screen 23 and the annular screen 24 again for screening, and the screening is sufficient and effective. The large impurities that cannot be screened finally remain on the annular screen 24. After the screening is completed, the rotary power assembly drives the screening vertical shaft 22 to rotate clockwise, and the discharge motor 63 drives the discharge shaft 62 to rotate clockwise by 20 degrees. The arc-shaped door panel 66 opens the discharge through groove 61. Due to the centrifugal force, the large impurities on the upper side of the annular screen 24 are located at the outer edge of the upper side of the annular screen 24. The large impurities remaining on the annular screen 24 rotate clockwise and encounter the outer side of the crushing and guiding plate 71, and are guided by the crushing and guiding plate 71 to be discharged from the discharge through groove 61.

[0042] Example 4. Please refer to Figures 1 to 10 , this example provides a technical solution: a biological composite premix screening device. This example is roughly the same as that of Example 3, and the difference lies in: It further includes an annular screen cleaning mechanism 8. The annular screen cleaning mechanism 8 includes a groove 81, a slide plate 82, a cleaning brush 85 and a compression spring 86. A groove 81 is opened at the bottom of the crushing guide plate 71. A slide plate 82 is vertically slidably connected to the inner bottom of the groove 81. A cleaning brush 85 is fixedly connected to the bottom of the slide plate 82. The bristles at the bottom of the cleaning brush 85 are in contact with the upper side of the annular screen 24. A compression spring 86 is installed at the top of the inner part of the groove 81. The bottom end of the compression spring 86 is connected to the top of the slide plate 82.

[0043] The annular screen cleaning mechanism 8 further includes a chute 83 and a slider 84. Two chutes 83 are respectively opened on both sides of the inner part of the groove 81. Two sliders 84 are respectively fixedly connected to both sides of the slide plate 82. The two sliders 84 are respectively vertically slidably connected to the two chutes 83.

[0044] The elastic force of the compression spring 86 pushes the slide plate 82 to move downward relative to the crushing guide plate 71, so that the cleaning brush 85 at the bottom of the slide plate 82 presses against the upper side of the annular screen 24. As the annular screen 24 rotates, the cleaning brush 85 cleans the screen holes on the annular screen 24, preventing the screen holes on the annular screen 24 from being blocked and maintaining the screening effect of the annular screen 24.

[0045] Please refer to Figures 1 to 10 , a screening method for a biological composite premix screening device, including the following steps: Step 1, add the biological composite premix to be screened into the filling hopper 33 of the premix filling and pretreatment mechanism 3 through the feed through hole 13. Then, the rotary power assembly drives the screening vertical shaft 22, the conical screen 23 and the annular screen 24 to rotate counterclockwise. The screening vertical shaft 22 drives the dispersion movable column 39 to rotate in the filling hopper 33, and cooperates with the dispersion fixed column 310 to disperse the agglomerated biological composite premix.

[0046] Step 2, the biological composite premix enters the pretreatment cylinder 34. The screening vertical shaft 22 drives the dispersion filling screw 36 to rotate counterclockwise. The dispersion filling screw 36 drives the biological composite premix in the pretreatment cylinder 34 to be conveyed downward, and further disperses the agglomerated biological composite premix at the same time.

[0047] Step 3, the biological composite premix falling to the center of the conical screen 23 rotates counterclockwise along with the conical screen 23, and is thus dispersed and dialed by the dispersion dialing piece 35, gradually slides down along the upper inclined surface of the conical screen 23, enters the area between the feed guiding conical sleeve 53 and the conical screen 23, and then enters the area between the reciprocating dispersion conical sleeve 52 and the conical screen 23.

[0048] Step 4: When the screening vertical shaft 22 rotates counterclockwise, it drives the reciprocating dispersion conical sleeve 52 to move up and down through the premix dispersion transmission mechanism 4. When the reciprocating dispersion conical sleeve 52 moves downward, it extrudes the biological composite premix by means of the dispersion rubbing teeth 54. As the conical screen 23 rotates counterclockwise, the dispersion rubbing teeth 54 and the conical screen 23 cooperate to rub and disperse the biological composite premix.

[0049] Step 5: The biological composite premix is screened through the sieve holes on the conical screen 23, and then the unscreened biological composite premix falls onto the annular screen 24 and is screened again through the sieve holes on the annular screen 24.

[0050] Step 6: As the annular screen 24 rotates counterclockwise, the biological composite premix on the annular screen 24 will hit the crushing blades 72 on the crushing guide plate 71, causing the biological composite premix to break. At the same time, the broken biological composite premix is guided by the crushing guide plate 71 and falls onto the conical screen 23, promoting the biological composite premix to pass through the sieve holes on the conical screen 23 and the annular screen 24.

[0051] Step 7: After the screening is completed, the rotation power assembly drives the screening vertical shaft 22 to rotate clockwise, and the discharging motor 63 drives the discharging shaft 62 to rotate clockwise by 20 degrees. The arc-shaped door plate 66 opens the discharging through groove 61. The large impurities remaining on the annular screen 24 rotate clockwise and encounter the crushing guide plate 71, and are guided by the crushing guide plate 71 to be discharged from the discharging through groove 61.

[0052] In order to handle abnormal situations in a timely manner during screening, a real-time monitoring module in the prior art can be set in the dust-proof tank 11 and the tank cover 12 to judge whether there is screening abnormality, such as sieve hole blockage, material accumulation, etc. If an abnormal situation occurs, an alarm can be given in a timely manner.

[0053] It should be noted that the screening motor 28, the air pump 91, and the discharging motor 63 disclosed in the above embodiments are all controlled by an external PLC controller, and the control method adopts the method commonly used in the prior art. Among them, the screening motor 28 and the discharging motor 63 both adopt servo motors that can rotate forward and backward.

[0054] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0055] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A biological composite premix screening device, comprising a screening and dust-proof container (1), the screening and dust-proof container (1) includes a dust-proof tank (11), the top of the dust-proof tank (11) is provided with a tank cover (12), and a feed through hole (13) is opened in the middle of the tank cover (12), characterized in that, Also includes: A premix screening mechanism (2) comprises a conical screen (23) and an annular screen (24), wherein a bent frame (21) is mounted on the tank cover (12), the end of the bent frame (21) is rotatably connected to a vertical screening shaft (22), and the bottom end of the screening shaft (22) is fixedly connected to the top center of the conical screen (23), the outer peripheral side of the conical screen (23) is integrally formed with the annular screen (24), and the top of the screening shaft (22) is connected to a rotating power assembly; A premix filling and pretreatment mechanism (3) is installed on the lower side of the tank cover (12); A premix crushing transmission mechanism (4) is mounted on the tank cover (12), and a premix crushing actuator (5) is fixedly connected to the bottom of the premix crushing transmission mechanism (4). The premix crushing actuator (5) is located on the upper side of the conical screen (23).

2. The biological composite premix screening device according to claim 1, wherein: The premix filling and pretreatment mechanism (3) includes a filling hopper (33), the lower side of the tank cover (12) is detachably connected to the top of the filling hopper (33), and the feed through hole (13) and the top opening of the filling hopper (33) are arranged correspondingly up and down, the bottom of the filling hopper (33) is integrally formed and connected to the top of the pretreatment cylinder (34), and the bottom end of the pretreatment cylinder (34) is provided with a plurality of dispersion paddles (35) in a circular array, the bottom of the screening vertical axis (22) passes through the center of the pretreatment cylinder (34), and the outer peripheral side of the screening vertical axis (22) is fixedly connected to the position of the pretreatment cylinder (34).

3. The screening device for the biological composite premix according to claim 2, characterized in that: The premix filling and pretreatment mechanism (3) further comprises a dispersing movable column (39) and a dispersing fixed column (310); the screening vertical axis (22) is sleeved with a collar (37) at a position corresponding to the middle of the filling bucket (33); a plurality of dispersing movable columns (39) are arranged in an annular array on the outer periphery of the collar (37); and a plurality of dispersing fixed columns (310) are arranged in an annular array on the inner periphery of the filling bucket (33).

4. The screening device for the biological composite premix according to claim 3, characterized in that: The premix dispersing actuator (5) comprises a reciprocating dispersing conical sleeve (52), the reciprocating dispersing conical sleeve (52) being located on the upper side of the conical screen (23), a plurality of dispersing teeth (54) being provided in an annular array on the lower side of the reciprocating dispersing conical sleeve (52), a mounting convex ring (51) being fixedly connected to the upper side of the reciprocating dispersing conical sleeve (52), and a feed guide conical sleeve (53) being integrally formed and connected to the top of the reciprocating dispersing conical sleeve (52).

5. The biological composite premix screening device according to claim 4, characterized in that: The premix crushing transmission mechanism (4) includes a control ring (49). Two protective guide sleeves (41) are fixedly connected to the tank cover (12). Two sliding columns (42) are vertically slidably connected to the two protective guide sleeves (41) respectively. Installation convex rings (51) are fixedly connected to the bottom ends of the two sliding columns (42), and two top plates (44) are fixedly connected to the top ends of the two sliding columns (42) respectively. Return springs (43) are sleeved on the parts of the sliding columns (42) between the protective guide sleeves (41) and the top plates (44). Universal ball seats (45) are installed on the top of each top plate (44), and universal balls (46) are installed on the top of the universal ball seats (45). A second sleeve ring (47) is fixedly sleeved on the top of the screening vertical shaft (22). A control ring (49) is fixedly connected to the outer peripheral side of the second sleeve ring (47) through three radial rods (48). Six arc-shaped protrusions (410) are arranged in an annular array at the bottom of the control ring (49), and the bottom surface of the control ring (49) is in rolling connection with the top of the universal ball (46).

6. The screening device for the biological composite premix according to claim 5, wherein: It further includes a sundry discharging mechanism (6). The sundry discharging mechanism (6) includes an arc-shaped door plate (66). A discharge through groove (61) is opened at the position on the side of the dust-proof tank (11) above the annular screen (24). The bottom surface of the discharge through groove (61) is flush with the upper side of the annular screen (24). A discharge shaft (62) is rotatably connected to one side in the discharge through groove (61). One end of the arc-shaped door plate (66) is fixedly connected to the part of the discharge shaft (62) located in the discharge through groove (61). A sealing rubber strip (64) is installed at the other end of the arc-shaped door plate (66). A motor chamber (65) is arranged at the position of the dust-proof tank (11) below the discharge through groove (61). A discharge motor (63) is installed in the motor chamber (65), and the output shaft of the discharge motor (63) is fixedly connected to the bottom end of the discharge shaft (62).

7. The biological composite premix screening device according to claim 6, characterized in that: It further includes a premix crushing and guiding mechanism (7). The premix crushing and guiding mechanism (7) includes a crushing and guiding plate (71) and crushing blades (72). One end of the crushing and guiding plate (71) is fixedly connected to the inner side of one end of the arc-shaped door plate (66) close to the discharge shaft (62). A plurality of crushing blades (72) are arranged at equal intervals on the side of the crushing and guiding plate (71) away from the arc-shaped door plate (66).

8. The screening device for the biological composite premix according to claim 7, characterized in that: It further includes an annular screen cleaning mechanism (8). The annular screen cleaning mechanism (8) includes a cleaning brush (85). A groove (81) is opened at the bottom of the crushing and guiding plate (71). A sliding plate (82) is vertically slidably connected to the inner bottom of the groove (81). A cleaning brush (85) is fixedly connected to the bottom of the sliding plate (82). The bristles at the bottom of the cleaning brush (85) are in contact with the upper side of the annular screen (24). A compression spring (86) is installed at the inner top of the groove (81), and the bottom end of the compression spring (86) is connected to the top of the sliding plate (82).

9. The screening device for the biological composite premix according to claim 8, characterized in that: The screening dustproof container (1) further includes a collecting hopper (16), the collecting hopper (16) is fixedly connected to a position below the annular screen (24) in the dustproof tank (11), the bottom center of the collecting hopper (16) is connected to the top of the discharge pipe (17), the bottom end of the discharge pipe (17) extends to the outside of the dustproof tank (11), and a butterfly valve (18) is installed at the bottom end of the discharge pipe (17), and a pneumatic sieve hole dredging mechanism (9) is installed on the outside of the dustproof tank (11), and the air outlet of the pneumatic sieve hole dredging mechanism (9) is connected to the position of the dustproof tank (11) between the annular screen (24) and the collecting hopper (16).

10. A screening method for a screening device of a biological composite premix, applied to the screening device of the biological composite premix described in claim 9, characterized in that, The following steps are involved: Step 1: Add the biocomposite premix to be screened into the filling hopper (33) of the premix filling and pretreatment mechanism (3) through the feed through hole (13), and then the rotating power assembly drives the screening vertical shaft (22), the conical screen (23) and the annular screen (24) to rotate counterclockwise, and the screening vertical shaft (22) drives the dispersing movable column (39) to rotate in the filling hopper (33), and cooperates with the dispersing fixed column (310) to disperse the agglomerated biocomposite premix; Step 2: The biocomposite premix enters the pretreatment barrel (34), and the screening vertical shaft (22) drives the dispersion and filling screw (36) to rotate counterclockwise. The dispersion and filling screw (36) drives the biocomposite premix in the pretreatment barrel (34) to be transported downward, and further disperses the agglomerated biocomposite premix; Step 3: The biocomposite premix that falls onto the center of the conical screen (23) rotates counterclockwise as the conical screen (23) is moved by the dispersing paddle (35), gradually slides down along the upper inclined surface of the conical screen (23), enters the area between the feed guide conical sleeve (53) and the conical screen (23), and then enters the area between the reciprocating dispersing conical sleeve (52) and the conical screen (23); Step 4: When the screening vertical shaft (22) rotates counterclockwise, the reciprocating dispersing cone sleeve (52) is driven to move up and down through the premix dispersing transmission mechanism (4); when the reciprocating dispersing cone sleeve (52) moves downward, the biocomposite premix is squeezed by the dispersing teeth (54); as the conical screen (23) rotates counterclockwise, the dispersing teeth (54) and the conical screen (23) cooperate to disperse the biocomposite premix; Step 5: the biocomposite premix is screened through the sieve holes on the conical screen (23), and then the unscreened biocomposite premix falls onto the annular screen (24) and is screened again through the sieve holes on the annular screen (24); Step 6: As the annular screen (24) rotates counterclockwise, the biocomposite premix on the annular screen (24) hits the crushing blade (72) on the crushing guide plate (71), causing the biocomposite premix to be crushed. At the same time, the crushed biocomposite premix is guided by the crushing guide plate (71) to fall onto the conical screen (23), thereby promoting the biocomposite premix to pass through the sieve holes on the conical screen (23) and the annular screen (24); Step 7, when the screening ends, the rotary power assembly drives the screening vertical shaft (22) to rotate clockwise, the discharge motor (63) drives the discharge shaft (62) to rotate clockwise by 20 degrees, and the arc-shaped door panel (66) opens the discharge through slot (61). The large impurities remaining on the annular screen (24) rotate clockwise and encounter the crushing guide plate (71), and are guided by the crushing guide plate (71) to be discharged from the discharge through slot (61).

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