Feed additive screening device for laying hen breeding

Abstract

The present invention discloses a feed additive screening device for laying hen farming, which relates to the technical field of screening devices. The device comprises a vibrating screening bin, a feed inlet is provided on the top rear side of the vibrating screening bin, vibration motors are installed on both sides of the bottom end of the vibrating screening bin, a screening box is installed inside the vibrating screening bin, a cleaning mechanism is installed inside the screening box, tilt adjustment components are installed on both sides of the screening box, the cleaning mechanism comprises a bevel gear set, two sets of transmission wheels are provided at one end of the rear side of the screening box, a screw is fixedly connected to the end of the transmission wheel away from the bevel gear set, a sleeve is sleeved on the outer surface of the screw, the sleeve extends into the interior of the screening box and is vertically slidably connected to a scraper, and an impact component is installed on the scraper, which solves the problem that adhesions adhere to the screen, making it inconvenient to clean, resulting in screen clogging, reduced screening efficiency and insufficient screening of feed additives.

Description

Technical Field

[0001] The invention relates to the technical field of screening devices, in particular to a feed additive screening device for laying hen breeding. Background Art

[0002] In the laying hen breeding process, feed additives are an important means to increase egg production, improve egg quality, and enhance the health of the flock. Reasonable use of additives can optimize feed nutrition and prevent diseases. When using feed additives, they need to be screened and used according to the three stages of chicks, young chickens, and laying hens. This is a key step to ensure breeding efficiency, egg quality, and flock health. If the additives are not selected properly, not only will the expected effect fail to be achieved, but it may also cause waste of resources, health problems for laying hens, and even affect food safety. For the production and processing of feed additives, screening devices are usually required for particle screening.

[0003] However, the existing screening device uses a vibration motor to drive the screen to vibrate for screening. On the one hand, during screening, some feed additives are sticky and will adhere to the screen, which is inconvenient to clean, thereby causing the screen to be blocked and reducing the screening efficiency. On the other hand, when the amount of feed additives to be screened 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, which can easily lead to insufficient screening of the feed additives.

[0004] In view of the above problems, it is urgent to carry out innovative design based on the original feed additive screening device for laying hen breeding. Summary of the Invention

[0005] The purpose of the present invention is to provide a feed additive screening device for laying hen farming to solve the problems raised by the above-mentioned background technology. The technical solution of the present invention addresses the technical problem that the existing technical solution is too single and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a feed additive screening device for laying hen farming, comprising a vibration screening bin, a feed inlet provided on the rear side of the top of the vibration screening bin, elastic support seats installed at the four corners of the bottom of the vibration screening bin, vibration motors installed on both sides of the bottom of the vibration screening bin, a discharge port installed on the front side of the vibration screening bin, a screening box installed inside the vibration screening bin, two groups of screening boxes corresponding to the discharge ports, a cleaning mechanism installed inside the screening box, and tilt adjustment components installed on both sides of the screening box;

[0007] 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 side of the two groups of screening boxes, and a belt is provided 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, and a sleeve is provided 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 limited to slide in the rear end slide groove of the screening box, and 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.

[0008] 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. An interference block is provided on the top of the cross bar.

[0009] Preferably, the inclination adjustment assembly includes a push rod, which is rotatably connected to the side end of the lower screening box. 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. The two ends of the fixing rod are respectively fixedly connected to the middle 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.

[0010] 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 the end of the adjusting rod away from the first piston rod is fixedly connected to the bottom end of the telescopic rod.

[0011] Preferably, a second oil tank is fixedly connected to the inner wall of the front side of the vibrating screening bin below the screening box, a second piston rod is slidingly limited inside the second oil tank, the output end of the second piston rod is rotatably connected to a sliding block, and the sliding block slides in a limited sliding groove at the bottom front side of the screening box.

[0012] 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 have opposite rotation directions, and the adjustment rod is set to an "L"-shaped structure.

[0013] Preferably, the interference blocks are arranged in several groups laterally along the top of the cross bar, the interference blocks are arranged in a triangular structure, the top of the interference blocks are in an arc-shaped structure, and a flow detector is arranged on the inner side of the fixed rod.

[0014] Preferably, the front side of the screening box extends to 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, the end of the scraper away from the screw rod is longitudinally limited and slided by a limit block, and the limit block slides in a limited groove on the inner wall of the front side of the screening box.

[0015] Preferably, the discharge port is located at the front side of the vibration screening bin and is arranged in three groups from top to bottom. The bottom of the vibration screening bin is arranged as an inclined structure with the inclined surface facing the front side of the vibration screening bin, and a controller is installed on one side of the outer periphery of the vibration screening bin.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention is provided with a cross bar, a first spring, a telescopic rod, a resistance block, a scraper and a tilt adjustment component, a first oil tank, a first piston rod, a second oil tank and a second piston rod. The tilt adjustment component drives the angle of the screening box to tilt, so as to accelerate the flow speed of the feed additive on the screen, so that it takes away some adhesions on the screen. When the angle of the screening box is tilted, the second piston rod is squeezed, and the telescopic rod is driven to extend and retract under the action of the first oil tank and the first piston rod, thereby adjusting the length of the telescopic rod. Driven by a drive motor, the scraper is driven to move relatively, and cooperates with the resistance block on the cross bar to impact the screen, so that the remaining adhesions fall off, thereby solving the problem that adhesions adhere to the screen, which is inconvenient to clean, causing the screen to be blocked and reducing the screening efficiency.

[0018] 2. The present invention is provided with a screening box, a bevel gear set, a transmission wheel, a screw, a sleeve and a scraper. The bevel gear set is driven by a driving motor to rotate, which drives the transmission wheel to rotate, and cooperates with the transmission belt to drive the screw to rotate. Since the threads at both ends rotate in opposite directions, the sleeve moves relative to each other, and the scraper moves relative to each other along the screen in the screening box, pushing the feed additives accumulated on the edge of the screen back onto the screen for screening, solving the problem that when the amount of feed additives screened is large, the feed additives on the screen will gradually accumulate on the edge of the screen under the action of the vibration motor, causing accumulation, which easily leads to insufficient screening of the feed additives. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a side view schematic diagram of the internal structure of the present invention;

[0021] Figure 3It is a top view schematic diagram of the internal structure of the present invention;

[0022] Figure 4 This is a schematic structural diagram of the screening box of the present invention;

[0023] Figure 5 This is a schematic structural diagram of the vibration component of the present invention;

[0024] Figure 6 This is a partially enlarged schematic diagram of structure A of the present invention;

[0025] Figure 7 This is a partially enlarged schematic diagram of structure B of the present invention;

[0026] Figure 8 It is a partially enlarged schematic diagram of the C structure of the present invention.

[0027] In the figure: 1. Vibrating screening bin; 2. Feed inlet; 3. Elastic support seat; 4. Vibrating motor; 5. Discharge outlet; 6. Screening box; 71. Bevel gear set; 72. Drive wheel; 73. Screw rod; 74. Sleeve; 75. Scraper; 761. Cross bar; 762. First spring; 763. Telescopic rod; 764. Resistance 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. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1-8The present invention provides a technical solution: a feed additive screening device for laying hen breeding, comprising a vibration screening bin 1, a feeding port 2 is provided on the top rear side of the vibration screening bin 1, elastic support seats 3 are installed at 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, and a discharge port 5 is installed on the front side of the vibration screening bin 1. The discharge port 5 is located at the front side of the vibration screening bin 1 and three groups are arranged from top to bottom. The bottom of the vibration screening bin 1 is arranged 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 outer periphery of the vibration screening bin 1, a screening box 6 is installed inside the vibration screening bin 1, and the front side of the screening box 6 extends to the inside of the discharge port 5, and the bottom of the front of the screening box 6 is connected to the inside of the discharge port 5 by an elastic sealing member. The screening box 6 is provided with two groups corresponding to the discharge port 5, and a cleaning mechanism is installed inside the screening box 6. Tilt adjustment components are installed on both sides of the screening box 6. First, the feed additive enters the screening box 6 through the feeding port 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;

[0030] The cleaning mechanism includes a bevel gear set 71, which is mounted on one side of the rear end of the screening box 6 through a drive 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 provided 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 provided 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 limited to slide 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 is longitudinally limited and slides away from the limit block of the screw rod 73. The limit block slides within the groove on the inner wall of the front side of the screening box 6. The scraper 75 is equipped with an impact assembly. The controller 13 controls the drive 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 rotation of the transmission wheel 72 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 are rotated 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 inside of the screening box 6 to move relative to each other, pushing the feed additives accumulated on both sides onto the screen for re-screening.

[0031] 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 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. A resistance block 764 is provided on the top of the cross bar 761. Several groups of resistance blocks 764 are arranged laterally along the top of the cross bar 761. The resistance blocks 764 It is set to a triangular structure, and the top of the interference 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 interference block 764 will interfere with the telescopic rod 763, causing the scraper 75 to move upward. The upward movement of the scraper 75 stretches the first spring 762. After the bottom of the telescopic rod 763 is separated from the interference block 764, the scraper 75 collides with the screen in the screening box 6 under the contraction of the first spring 762. Under the action of the collision and the flow of feed additives, the adhesion on the screen falls off, thereby achieving the cleaning of the screen.

[0032] As an embodiment of the present invention, the tilt adjustment assembly includes a push rod 81, which is rotatably connected to the side end of the lower screening box 6. The push rod 81 is driven by the electric push rod at the bottom of the vibrating screening bin 1. Connecting rods 82 are installed on both sides of the two groups of 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. Two groups of connecting rods 82 are provided, and a fixed rod 83 is provided between the two groups of connecting rods 82. The two ends of the fixed rod 83 are respectively fixedly connected to the middle of the side ends of the two groups of screening boxes 6. The middle position of the fixed rod 83 is rotatably connected to the inner wall of the internal cavity of the vibrating screening bin 1 through a bearing. A flow detector is provided on the inside of the fixed rod 83. The controller 13 controls the electric push rod to push the push rod 81 to move upward. The push rod 81 moves upward and cooperates with the connecting rod 82 to push the screening box 6 to gradually tilt along the rotating axis in the middle of the fixed rod 83, thereby accelerating the flow rate of the feed additives in the screening box 6 and taking away some adhesions.

[0033] As an embodiment of the present invention, a first oil tank 9 is fixedly connected to one side of the through groove on the scraper 75, a first piston rod 10 is limited and slidable in the first oil tank 9, a second spring is provided on the outer sleeve of the first piston rod 10, and an adjusting rod is fixedly connected to the output end of the first piston rod 10. An adjusting groove is provided on the inside of the scraper 75 above the first oil tank 9, and the adjusting rod is limited and slidable in the adjusting groove. The adjusting rod is set to an "L"-shaped structure, and 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 inner wall of the front side of the vibrating screening bin 1 below the screening box 6, and a second piston rod 12 is limited and slidable inside the second oil tank 11. The output end of 12 is rotatably connected to a sliding block, which slides in a limited position in the bottom limit slide groove on the front side of the screening box 6. The oil chamber below the first oil tank 9 is connected to the oil chamber above the second oil tank 11 through a hose. The screening box 6 gradually tilts along the rotating axis in the middle of the fixed rod 83. At the same time, the front side of the screening box 6 will squeeze the second piston rod 12 to make it 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 slide groove, and the downward sliding of the adjusting rod drives the telescopic rod 763 to move downward, thereby realizing the adjustment of the impact force.

[0034] Working principle: When using the feed additive screening device for laying hen farming, first, the feed additive is put into 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. As the screening time goes by, under the action of the vibration motor 4, a part of the feed additive will gradually gather on the edge of the screen. 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 rotation of the transmission wheel 72 cooperates with the belt to drive the screw rod 73 on the rear side of the upper and lower screening boxes 6 to rotate. Since the threads at both ends of the screw rod 73 have opposite rotation 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 inside 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.

[0035] While screening the feed additives, some adhesions in the feed additives will adhere to the screen and cause blockage. At this time, the flow detector will detect the flow change, and thus control the electric push rod through the controller 13 to push the push rod 81 to move upward. The push rod 81 moves upward and cooperates with the connecting rod 82 to push the screening box 6 to gradually tilt along the rotation axis in the middle of the fixed rod 83, thereby accelerating the flow rate of the feed additives in the screening box 6 and taking away some adhesions. The screening box 6 gradually tilts along the rotation axis in the middle of the fixed rod 83. At the same time, the front side of the screening box 6 will squeeze the second piston rod 12 to make it slide in the second oil tank 11. The oil in the second oil tank 11 flows to the first oil tank 9 through the hose, squeezing the first The first piston rod 10 in the oil tank 9 moves downward, and the first piston rod 10 moves downward, driving the adjusting rod to slide downward along the slide groove. The adjusting rod slides downward, driving the telescopic rod 763 to move downward, and driving the scraper 75 to move relatively through the screw rod 73. At this time, the bottom of the telescopic rod 763 moves along the cross bar 761, and the interference block 764 will interfere with the telescopic rod 763, causing the scraper 75 to move upward. The scraper 75 moves upward to stretch the first spring 762. After the bottom of the telescopic rod 763 disengages from the interference block 764, the scraper 75 impacts the screen 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 feed additives, the adhesion on the screen falls off, thereby achieving the cleaning of the screen.

[0036] Any content not described in detail in this specification is prior art known to those skilled in the art. In the description of the present invention, unless otherwise specified, "plurality" means two or more. Terms such as "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings and are intended solely for ease of description and simplification. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation and are therefore not to be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified or limited, the terms "connected" and "connected" are to be understood broadly, meaning, for example, fixedly connected, detachably connected, or integrally connected; mechanically connected, electrically connected; directly connected, or indirectly connected through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention on a case-by-case basis.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A feed additive screening device for laying hens, comprising a vibrating screening chamber (1), characterized in that: The vibration screening bin (1) is provided with a feed port (2) at the rear side of the top, 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 provided 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 includes a bevel gear set (71), which is installed on the rear side 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 provided between the transmission wheels (72). The upper end of the 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 outer surface of the screw rod (73) is provided with a sleeve (74). 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 chute of the screening box (6). The sleeve (74) extends to the screening box (6). A scraper (75) is arranged inside the selection box (6) and is vertically slidably connected thereto. An impact assembly is mounted on the scraper (75). The impact assembly comprises a cross bar (761) which is fixedly connected to the inner walls on both sides of the screening box (6). Two groups of cross bars (761) are provided inside the screening box (6). 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 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). A resisting block (764) is provided on the top of the cross bar (761).

2. The feed additive screening device for laying hens according to claim 1, characterized in that: The tilt adjustment assembly includes a push rod (81), which 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 groups of 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). Two groups of connecting rods (82) are provided. A fixed rod (83) is provided between the two groups of connecting rods (82). The two ends of the fixed rod (83) are respectively fixedly connected to the middle of the side ends of the two groups of screening boxes (6). The middle position of the fixed rod (83) is rotatably connected to the inner wall of the internal cavity of the vibration screening bin (1) through a bearing.

3. The feed additive screening device for laying hen breeding according to claim 2, characterized in that: A first oil tank (9) is fixedly connected to one side of the through groove on the scraper (75), a first piston rod (10) is limitedly slidable in the first oil tank (9), a second spring is provided on the outer periphery of the first piston rod (10), an adjusting rod is fixedly connected to the output end of the first piston rod (10), an adjusting groove is provided on the inner side of the scraper (75) above the first oil tank (9), the adjusting rod is limitedly slidable in the adjusting groove, and an end of the adjusting rod away from the first piston rod (10) is fixedly connected to the bottom end of the telescopic rod (763).

4. The feed additive screening device for laying hen breeding according to claim 3, characterized in that: A second oil tank (11) is fixedly connected to the inner wall of the front side of the vibration screening bin (1) below the screening box (6), a second piston rod (12) is slidingly limited inside the second oil tank (11), and a sliding block is rotatably connected to the output end of the second piston rod (12), and the sliding block slides within the limiting chute at the bottom front side of the screening box (6).

5. The feed additive screening device for laying hen breeding according to claim 4, characterized in that: The oil chamber below the first oil tank (9) is connected to the oil chamber above the second oil tank (11) through a hose. The threads at both ends of the screw rod (73) are rotated in opposite directions. The adjusting rod is configured as an "L"-shaped structure.

6. The feed additive screening device for laying hens according to claim 5, characterized in that: Several groups of the resistance blocks (764) are arranged transversely along the top of the crossbar (761). The resistance blocks (764) are arranged in a triangular structure. The top of the resistance block (764) is in an arc-shaped structure. A flow detector is arranged on the inner side of the fixed rod (83).

7. The feed additive screening device for laying hens according to claim 6, characterized in that: The front side of the screening box (6) extends to the inside of the discharge port (5), and the bottom of the front side of the screening box (6) is connected to the inside of the discharge port (5) through an elastic seal. The end of the scraper (75) away from the screw rod (73) is longitudinally limited and slides with a limit block, and the limit block slides within the inner wall groove of the front side of the screening box (6).

8. The feed additive screening device for laying hen farming according to claim 7, characterized in that: The discharge ports (5) are located on the front side of the vibration screening bin (1) and are arranged in three groups from top to bottom. The bottom of the vibration screening bin (1) is arranged as 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 outer periphery of the vibration screening bin (1).

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