Feed additive screening device for laying hen breeding

Abstract

The invention discloses a feed additive screening device for laying hen breeding, and relates to the technical field of screening devices. Comprising a vibration screening bin, a feeding port is formed in the rear side of the top of the vibration screening bin, vibration motors are installed on the two sides of the bottom end of the vibration screening bin, a screening box is installed in the vibration screening bin, a cleaning mechanism is installed in the screening box, inclination adjusting assemblies are installed on the two sides of the screening box, and the cleaning mechanism comprises a bevel gear set. Transmission wheels are arranged at one ends of the rear sides of the two screening boxes, the ends, away from the bevel gear sets, of the transmission wheels are fixedly connected with lead screws, the peripheral surfaces of the lead screws are sleeved with sleeves, the sleeves extend into the screening boxes and are vertically and slidably connected with scraping plates, and impact assemblies are installed on the scraping plates. The problems that due to the fact that cleaning is inconvenient, a screen is blocked, the screening efficiency is reduced, and feed additives are not sufficiently screened are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of screening devices, and particularly to a screening device for feed additives used in laying hen breeding. Background Technique

[0002] During the process of laying hen breeding, feed additives are an important means to improve the egg production rate, improve the egg quality, and enhance the health of the chicken flock. Reasonable use of additives can optimize feed nutrition and prevent diseases. When using feed additives, it is necessary to screen and use them according to three stages: chicks, young hens, and laying hens, which is a key step to ensure breeding efficiency, egg quality, and the health of the chicken flock. If the additives are not selected properly, not only the expected effects cannot be achieved, but also resource waste, health problems of laying hens, and even food safety may be affected. For the production and processing of feed additives, screening devices are usually required for particle screening.

[0003] However, the existing screening devices use vibration motors to drive the vibrating screen for screening. On the one hand, during screening, due to the adhesiveness of some feed additives, they will adhere to the screen, which is inconvenient to clean, thus leading to screen blockage and reducing the screening efficiency. On the other hand, when the screening amount of feed additives is large, the feed additives on the screen will gradually gather at the edge of the screen under the action of the vibration motor, causing accumulation and easily resulting in insufficient screening of feed additives.

[0004] In view of the above problems, it is urgent to innovate and design on the basis of the original screening device for feed additives used in laying hen breeding. Summary of the Invention

[0005] The purpose of the present invention is to provide a screening device for feed additives used in laying hen breeding to solve the problems raised in the above background technique. The technical solution of the present invention provides a solution significantly different from the prior art for the technical problem that the prior art solution is too single.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A screening device for feed additives used in laying hen breeding, including a vibration screening bin. An inlet is arranged at the rear side of the top of the vibration screening bin. Elastic support seats are installed at the four corners of the bottom of the vibration screening bin. Vibration motors are installed on both sides of the bottom end of the vibration screening bin. An outlet is arranged at the front side of the vibration screening bin. A screening box is installed inside the vibration screening bin. Two groups of screening boxes are provided corresponding to the outlet. A cleaning mechanism is installed inside the screening box. Tilt adjustment components are installed on both sides of the screening box. The cleaning mechanism includes a bevel gear set, which is installed on one side of the rear end of the screening box through a driving motor. A transmission wheel is provided at one end of the rear sides of the two groups of screening boxes, a belt is sleeved between the transmission wheels, the upper transmission wheel is fixedly connected to the output end of the bevel gear set, and the end of the transmission wheel away from the bevel gear set is fixedly connected to a screw rod, a sleeve is sleeved on the outer surface of the screw rod, and the sleeve is threadedly connected to the outer surface of the screw rod, the sleeve is limitedly slid in the rear end slide groove of the screening box, the sleeve extends to the inside of the screening box, and is vertically slidably connected to a scraper, and an impact assembly is installed on the scraper.

[0007] Preferably, the impact assembly includes a cross bar, which is fixedly connected to the inner walls on both sides of the screening box. Two groups of cross bars are provided inside the screening box. A through groove is provided on the scraper corresponding to the cross bar. The bottom of the cross bar is located in the through groove and is fixedly connected to a first spring. The bottom end of the first spring is fixedly connected to the bottom end of the through groove. A telescopic rod is fixedly connected to the top of the through groove. A resistance block is provided on the top of the cross bar.

[0008] Preferably, the inclination adjustment assembly includes a push rod, which is rotatably connected to the side end of the lower screening box, and the push rod is driven by an electric push rod at the bottom of the vibration screening bin. Connecting rods are installed on both sides of the two groups of screening boxes, one end of the connecting rod is fixedly connected to the upper screening box, and the other end of the connecting rod is rotatably connected to the lower screening box. Two groups of connecting rods are provided, and a fixing rod is provided between the two groups of connecting rods. Both ends of the fixing rod are respectively fixedly connected to the middle parts of the side ends of the two groups of screening boxes, and the middle position of the fixing rod is rotatably connected to the inner wall of the internal cavity of the vibration screening bin through a bearing.

[0009] Preferably, the scraper is fixedly connected to a first oil tank on one side of the through groove, a first piston rod is limitedly slidable in the first oil tank, a second spring is provided on the outer periphery of the first piston rod, an adjusting rod is fixedly connected to the output end of the first piston rod, an adjusting groove is provided on the inner side of the scraper above the first oil tank, the adjusting rod is limitedly slidable in the adjusting groove, and one end of the adjusting rod away from the first piston rod is fixedly connected to the bottom end of the telescopic rod.

[0010] Preferably, a second oil tank is fixedly connected to the inner wall of the front side of the vibration screening bin below the screening box, a second piston rod is limitedly slidable inside the second oil tank, a sliding block is rotatably connected to the output end of the second piston rod, and the sliding block slides within the limited sliding groove at the bottom front side of the screening box.

[0011] Preferably, the oil chamber below the first oil tank is connected to the oil chamber above the second oil tank through a hose, the threads at both ends of the screw rod have opposite rotation directions, and the adjustment rod is set to an "L"-shaped structure.

[0012] Preferably, a number of groups of the abutting blocks are transversely arranged along the top of the cross bar. The abutting blocks are arranged in a triangular structure, and the top of the abutting blocks is in an arc-shaped structure. A flow detector is arranged inside the fixing rod.

[0013] Preferably, the front side of the screening box extends into the inside of the discharge port. The bottom of the front side of the screening box is connected to the inside of the discharge port through an elastic seal. One end of the scraping plate away from the lead screw is longitudinally and limit slidably provided with a limit block, and the limit block is limit slidably arranged in a chute on the inner wall of the front side of the screening box.

[0014] Preferably, three groups of the discharge ports are arranged from top to bottom on the front side of the vibration screening bin. The inner bottom of the vibration screening bin is arranged in an inclined structure with an inclined surface facing the front side of the vibration screening bin. A controller is installed on one side of the periphery of the vibration screening bin.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, there are provided a cross bar, a first spring, a telescopic rod, an abutting block, a scraping plate and an inclination adjusting assembly, a first oil tank, a first piston rod, a second oil tank and a second piston rod. By driving the inclination adjusting assembly, the angle of the screening box is inclined to accelerate the flow rate of the feed additive on the screen mesh, so as to take away some of the adhesives on the screen mesh. While the angle of the screening box is inclined, the second piston rod is extruded. Under the cooperation of the first oil tank and the first piston rod, the telescopic rod is driven to expand and contract, and then the length of the telescopic rod is adjusted. Driven by the driving motor, the scraping plate moves relatively, and cooperates with the abutting block on the cross bar to impact the screen mesh, so as to promote the remaining adhesives to fall off, solving the problem that the adhesives adhere to the screen mesh, which is inconvenient to clean, resulting in screen mesh blockage and reduced screening efficiency.

[0016] 2. In the present invention, there are provided a screening box, a bevel gear set, a transmission wheel, a lead screw, a sleeve and a scraping plate. By driving the bevel gear set to rotate by a driving motor, the transmission wheel is driven to rotate. Cooperating with a transmission belt, the lead screw is driven to rotate. Since the thread directions at both ends are opposite, the sleeves move relatively, realizing the relative movement of the scraping plate along the screen mesh inside the screening box, and pushing the feed additive accumulated at the edge of the screen mesh back onto the screen mesh for screening, solving the problem that when the screening amount of the feed additive is large, the feed additive on the screen mesh will gradually accumulate at the edge of the screen mesh under the action of the vibration motor, causing accumulation and easily resulting in insufficient screening of the feed additive. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic side view of the internal structure of the present invention; Figure 3 is a schematic top view of the internal structure of the present invention; Figure 4Schematic diagram of the screening box structure of the present invention; Figure 5 Schematic diagram of the vibration assembly structure of the present invention; Figure 6 Partial enlarged schematic diagram of structure A of the present invention; Figure 7 Partial enlarged schematic diagram of structure B of the present invention; Figure 8 Partial enlarged schematic diagram of structure C of the present invention.

[0018] In the figure: 1, vibration screening bin; 2, feed inlet; 3, elastic support seat; 4, vibration motor; 5, discharge outlet; 6, screening box; 71, bevel gear set; 72, transmission wheel; 73, lead screw; 74, sleeve; 75, scraper; 761, cross bar; 762, first spring; 763, telescopic rod; 764, abutting block; 81, push rod; 82, connecting rod; 83, fixed rod; 9, first oil tank; 10, first piston rod; 11, second oil tank; 12, second piston rod; 13, controller. Specific implementation manners

[0019] 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.

[0020] Please refer to Figures 1 - 8 , the present invention provides a technical solution: a feed additive screening device for laying hen breeding, including a vibration screening bin 1, a feed inlet 2 is arranged at the rear side of the top of the vibration screening bin 1, elastic support seats 3 are installed at the four corners of the bottom of the vibration screening bin 1, vibration motors 4 are installed on both sides of the bottom end of the vibration screening bin 1, a discharge outlet 5 is installed on the front side of the vibration screening bin 1, three groups of discharge outlets 5 are arranged from top to bottom on the front side of the vibration screening bin 1, the inner bottom of the vibration screening bin 1 is set as an inclined structure with an inclined surface facing the front side of the vibration screening bin 1, a controller 13 is installed on one side of the periphery of the vibration screening bin 1, a screening box 6 is installed inside the vibration screening bin 1, the front side of the screening box 6 extends into the discharge outlet 5, the bottom of the front side of the screening box 6 is connected to the inside of the discharge outlet 5 through an elastic seal, two groups of screening boxes 6 are arranged corresponding to the discharge outlet 5, a cleaning mechanism is installed inside the screening box 6, and inclined adjustment components are installed on both sides of the screening box 6. First, the feed additive enters the screening box 6 through the feed inlet 2, and then the vibration motor 4 is started to drive the screening box 6 to vibrate through the vibration screening bin 1 to screen the feed additive; The cleaning mechanism includes a bevel gear set 71, which is installed on one side of the rear end of the screening box 6 through a driving motor. A transmission wheel 72 is provided at one end of the rear side of the two sets of screening boxes 6. A belt is sleeved between the transmission wheels 72. The upper transmission wheel 72 is fixedly connected to the output end of the bevel gear set 71. The end of the transmission wheel 72 away from the bevel gear set 71 is fixedly connected to a screw rod 73. The threads at both ends of the screw rod 73 are rotated in opposite directions. A sleeve 74 is sleeved on the outer surface of the screw rod 73. The sleeve 74 is threadedly connected to the outer surface of the screw rod 73. The sleeve 74 is limitedly slid in the rear end slide groove of the screening box 6. The sleeve 74 extends to the inside of the screening box 6 and is vertically slidably connected to the scraper 7 5. The end of the scraper 75 away from the screw rod 73 is longitudinally limited and slides with a limit block. The limit block slides in the inner wall groove on the front side of the screening box 6. The scraper 75 is installed with an impact component. The controller 13 controls the driving motor to rotate and drive the bevel gear set 71 to operate. The operation of the bevel gear set 71 drives the transmission wheel 72 to rotate. The transmission wheel 72 rotates and cooperates with the belt to drive the screw rods 73 on the rear sides of the upper and lower screening boxes 6 to rotate. Since the threads at both ends of the screw rod 73 rotate in opposite directions, the sleeve 74 is driven to move relative to each other. The relative movement of the sleeve 74 drives the scrapers 75 on both sides of the screening box 6 to move relative to each other, and the feed additives accumulated on both sides are pushed onto the screen for re-screening.

[0021] As an embodiment of the present invention, the impact assembly includes a cross bar 761, which is fixedly connected to the inner walls on both sides of the screening box 6. The cross bar 761 is located inside the screening box 6 and is provided with two groups. A through groove is provided on the scraper 75 corresponding to the cross bar 761. The bottom of the cross bar 761 is located in the through groove and is fixedly connected with a first spring 762. The bottom end of the first spring 762 is fixedly connected to the bottom end of the through groove. A telescopic rod 763 is fixedly connected to the top of the through groove. A resistance block 764 is provided at the top of the cross bar 761. Several groups of resistance blocks 764 are arranged horizontally along the top of the cross bar 761. The resistance blocks 764 It is set as a triangular structure, and the top of the resistance block 764 is an arc-shaped structure. The scraper 75 is driven to move relatively by the screw rod 73. At this time, the bottom of the telescopic rod 763 moves along the cross bar 761, and the resistance block 764 will resist the telescopic rod 763, so that the scraper 75 moves upward. The scraper 75 moves upward to stretch the first spring 762. After the bottom of the telescopic rod 763 is separated from the resistance block 764, the scraper 75 hits the screen in the screening box 6 under the contraction of the first spring 762. The adhesion on the screen falls off under the action of the impact and the flow of feed additives, thereby realizing the cleaning of the screen.

[0022] As an embodiment of the present invention, the tilt adjustment assembly includes a push rod 81. The push rod 81 is rotatably connected to the side end of the lower screening box 6. The push rod 81 is driven by an electric push rod at the bottom of the vibration screening bin 1. Connecting rods 82 are installed on both sides of the two screening boxes 6. One end of the connecting rod 82 is fixedly connected to the upper screening box 6, and the other end of the connecting rod 82 is rotatably connected to the lower screening box 6. There are two sets of connecting rods 82. A fixing rod 83 is arranged between the two sets of connecting rods 82. Both ends of the fixing rod 83 are fixedly connected to the middle parts of the side ends of the two screening boxes 6. The middle position of the fixing rod 83 is rotatably connected to the inner wall of the inner cavity of the vibration screening bin 1 through a bearing. A flow detector is arranged inside the fixing rod 83. The controller 13 controls the electric push rod to push the push rod 81 to move upward. The upward movement of the push rod 81 cooperates with the connecting rod 82 to push the screening box 6 to gradually tilt along the rotation axis in the middle of the fixing rod 83, thereby accelerating the flow rate of the feed additive in the screening box 6 and taking away some adhesives.

[0023] As an embodiment of the present invention, a first oil tank 9 is fixedly connected to one side of the scraper 75 located in the through groove. A first piston rod 10 is slidably limited in the first oil tank 9. A second spring is sleeved around the first piston rod 10. The output end of the first piston rod 10 is fixedly connected to an adjusting rod. An adjusting groove is opened inside the scraper 75 above the first oil tank 9. The adjusting rod is slidably limited in the adjusting groove. The adjusting rod is arranged in an "L" shape. The end of the adjusting rod away from the first piston rod 10 is fixedly connected to the bottom end of the telescopic rod 763. A second oil tank 11 is fixedly connected to the front inner wall of the vibration screening bin 1 below the screening box 6. A second piston rod 12 is slidably limited inside the second oil tank 11. The output end of the second piston rod 12 is rotatably connected to a sliding block. The sliding block is slidably limited in the limit chute at the bottom of the front side of the screening box 6. The oil chamber below the first oil tank 9 is communicated with the oil chamber above the second oil tank 11 through a hose. When the screening box 6 gradually tilts along the rotation axis in the middle of the fixing rod 83, the front side of the screening box 6 will squeeze the second piston rod 12, causing it to slide in the second oil tank 11. The oil in the second oil tank 11 flows into the first oil tank 9 through the hose, squeezing the first piston rod 10 in the first oil tank 9 to move downward. The downward movement of the first piston rod 10 drives the adjusting rod to slide downward along the chute. The downward sliding of the adjusting rod drives the telescopic rod 763 to move downward, realizing the adjustment of the impact force.

[0024] Working principle: When using this screening device for feed additives for laying hens, first, the feed additives enter the screening box 6 through the feed inlet 2. Then, the vibration motor 4 is started to drive the screening box 6 to vibrate through the vibration screening bin 1, so as to screen the feed additives. As the screening time goes by, under the action of the vibration motor 4, part of the feed additives will gradually gather at the edge of the sieve mesh. The controller 13 controls the driving motor to rotate, driving the bevel gear set 71 to operate. The operation of the bevel gear set 71 drives the transmission wheel 72 to rotate. The rotation of the transmission wheel 72 drives the lead screws 73 at the rear sides of the upper and lower groups of screening boxes 6 to rotate through the belt. Since the thread helix directions at both ends of the lead screw 73 are opposite, the sleeves 74 move relatively, and the relative movement of the sleeves 74 drives the scraping plates 75 on both sides inside the screening box 6 to move relatively, pushing the feed additives accumulated on both sides onto the sieve mesh for re-screening; While screening the feed additives, some adhesives in the feed additives will adhere to the sieve mesh, causing blockage. At this time, the flow detector will detect the flow change, and then the controller 13 controls the electric push rod to push the push rod 81 upward. The upward movement of the push rod 81 cooperates with the connecting rod 82 to push the screening box 6 to gradually tilt along the rotating shaft in the middle of the fixed rod 83, so that the flow rate of the feed additives in the screening box 6 is accelerated, taking away some adhesives. While the screening box 6 gradually tilts along the rotating shaft in the middle of the fixed rod 83, the front side of the screening box 6 will squeeze the second piston rod 12, causing it to slide in the second oil tank 11. The oil in the second oil tank 11 flows into the first oil tank 9 through the hose, squeezing the first piston rod 10 in the first oil tank 9 to move downward. The downward movement of the first piston rod 10 drives the adjusting rod to slide downward along the chute. The downward sliding of the adjusting rod drives the telescopic rod 763 to move downward. Through the lead screw 73, the scraping plates 75 are driven to move relatively. At this time, the bottom of the telescopic rod 763 moves along the cross bar 761, and the abutting block 764 will abut against the telescopic rod 763, causing the scraping plate 75 to move upward. The upward movement of the scraping plate 75 stretches the first spring 762. After the bottom of the telescopic rod 763 disengages from the abutting block 764, the scraping plate 75 impacts the sieve mesh in the screening box 6 under the action of the contraction of the first spring 762. Under the action of the impact and the flow of the feed additives, the adhesives on the sieve mesh fall off, realizing the cleaning of the sieve mesh.

[0025] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A feed additive screening device for laying hen breeding, comprising a vibration screening bin (1), characterized in that: A feed port (2) is arranged at the rear side of the top of the vibration screening bin (1); elastic support seats (3) are installed at the four corners of the bottom of the vibration screening bin (1); vibration motors (4) are installed on both sides of the bottom of the vibration screening bin (1); a discharge port (5) is installed on the front side of the vibration screening bin (1); a screening box (6) is installed inside the vibration screening bin (1); two groups of screening boxes (6) are arranged corresponding to the discharge port (5); a cleaning mechanism is installed inside the screening box (6); and tilt adjustment components are installed on both sides of the screening box (6); The cleaning mechanism comprises a bevel gear set (71), the bevel gear set (71) being mounted on one side of the rear end of the screening box (6) through a driving motor, a transmission wheel (72) being arranged at one end of the rear side of the two sets of screening boxes (6), a belt being sleeved between the transmission wheels (72), the upper end of the transmission wheel (72) being fixedly connected to the output end of the bevel gear set (71), the end of the transmission wheel (72) away from the bevel gear set (71) being fixedly connected to a screw rod (73), the outer surface of the screw rod (73) being sleeved with a sleeve (74), the sleeve (74) being threadedly connected to the outer surface of the screw rod (73), the sleeve (74) being limitedly slidable in a rear end slide groove of the screening box (6), the sleeve (74) extending into the interior of the screening box (6) and being vertically slidably connected to a scraper (75), the scraper (75) being mounted with an impact assembly.

2. The feed additive screening device for laying hen breeding according to claim 1, wherein: The impact assembly comprises a cross bar (761), wherein the cross bar (761) is fixedly connected to the inner walls on both sides of the screening box (6), and two groups of the cross bars (761) are provided inside the screening box (6), and a through groove is provided on the scraper (75) corresponding to the cross bar (761), and the bottom of the cross bar (761) is located in the through groove and is fixedly connected to a first spring (762), the bottom end of the first spring (762) is fixedly connected to the bottom end of the through groove, the top of the through groove is fixedly connected to a telescopic rod (763), and the top of the cross bar (761) is provided with a resistance block (764).

3. The screening device for feed additives for laying hen breeding according to claim 2, characterized in that: The tilt adjustment assembly comprises a push rod (81), the push rod (81) being rotatably connected to the side end of the lower screening box (6), the push rod (81) being driven by an electric push rod at the bottom of the vibration screening bin (1), connecting rods (82) being installed on both sides of the two groups of screening boxes (6), one end of the connecting rod (82) being fixedly connected to the upper screening box (6), and the other end of the connecting rod (82) being rotatably connected to the lower screening box (6), two groups of connecting rods (82) being provided, a fixing rod (83) being provided between the two groups of connecting rods (82), the two ends of the fixing rod (83) being respectively fixedly connected to the middle parts of the side ends of the two groups of screening boxes (6), and the middle position of the fixing rod (83) being rotatably connected to the inner wall of the internal cavity of the vibration screening bin (1) through a bearing.

4. The screening device for feed additives for laying hen breeding according to claim 3, characterized in that: On one side of the through groove on the scraper (75), a first oil tank (9) is fixedly connected. A first piston rod (10) is limited and slid in the first oil tank (9). A second spring is sleeved around the first piston rod (10). The output end of the first piston rod (10) is fixedly connected with an adjusting rod. An adjusting groove is formed inside the scraper (75) above the first oil tank (9). The adjusting rod is limited and slid in the adjusting groove. One end of the adjusting rod away from the first piston rod (10) is fixedly connected with the bottom end of the telescopic rod (763).

5. The feed additive screening device for laying hen breeding according to claim 4, wherein: Below the screening box (6) and on the front inner wall of the vibration screening bin (1), a second oil tank (11) is fixedly connected. A second piston rod (12) is limited and slid inside the second oil tank (11). The output end of the second piston rod (12) is rotatably connected with a sliding block. The sliding block is limited and slid in the limit chute at the bottom of the front side of the screening box (6).

6. The screening device for feed additives for laying hen breeding according to claim 5, characterized in that: The oil chamber below the first oil tank (9) is communicated with the oil chamber above the second oil tank (11) through a hose. The thread directions at both ends of the screw rod (73) are opposite. The adjusting rod is arranged in an "L" shape structure.

7. The screening device for feed additives for laying hen breeding according to claim 6, characterized in that: A number of groups of the abutting blocks (764) are arranged horizontally along the top of the cross bar (761). The abutting blocks (764) are arranged in a triangular structure. The top of the abutting blocks (764) is in an arc-shaped structure. A flow detector is arranged inside the fixed rod (83).

8. A screening device for feed additives used in laying hen farming, characterized in that: The front side of the screening box (6) extends into the discharge port (5). The bottom of the front side of the screening box (6) is connected with the inside of the discharge port (5) through an elastic seal. One end of the scraper (75) away from the screw rod (73) is longitudinally limited and slid with a limit block. The limit block is limited and slid in the chute on the front inner wall of the screening box (6).

9. A screening device for feed additives for laying hen breeding, characterized in that: There are three groups of discharge ports (5) arranged from top to bottom on the front side of the vibration screening bin (1). The inner bottom of the vibration screening bin (1) is arranged in an inclined structure with the inclined surface facing the front side of the vibration screening bin (1). A controller (13) is installed on one side of the periphery of the vibration screening bin (1).

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