Seed metering device with arc-shaped deflector

Abstract

The utility model discloses a kind of seed metering device with arc flow guide plate, it is related to agricultural production equipment technical field.Seed metering device includes front shell, arc flow guide plate, seed metering disc, rear shell and connecting shaft, arc flow guide plate, seed metering disc and rear shell are sequentially connected by connecting shaft, arc flow guide plate includes fixed seat, arc flow guide rod and circular flow guide piece, one end of arc flow guide rod is connected with fixed seat, the other end of arc flow guide rod is connected with circular flow guide piece;Seed metering disc is provided with several evenly distributed composite holes.In the utility model, when arc flow guide plate rotates, it exerts certain circumferential thrust and radial pressure on inner layer population, and is transmitted to outer layer population from inside to outside, so that the population of entire filling seed area moves violently, thereby increasing the filling force and relative movement speed of the seed to be filled above composite hole.The arc flow guide plate of the utility model can effectively avoid seed damage compared with existing straight line flow guide plate, and effectively improve filling effect under high-speed operation.

Description

Technical Field

[0001] This utility model relates to the field of agricultural production equipment technology, specifically to a seed metering device with an arc-shaped guide plate. Background Technology

[0002] A seeder is a planting machine that uses seeds as the sowing medium. Modern sowing technology requires high-speed and precision sowing. The seed metering device is the core working component of precision sowing technology. It is a crucial device that determines the working quality and performance of individual seeders, playing a significant role in whether the seeder can meet the agronomical requirements of sowing and achieve uniform sowing, accurate plant spacing, and high work efficiency. Considering the characteristics of mechanical seed metering devices and sowing agronomy in my country, although mechanical seed metering devices have a simple structure and stable sowing performance, as the machine's operating speed increases, the seed filling efficiency decreases, leading to a decrease in sowing accuracy, which is detrimental to high-speed sowing operations.

[0003] During seed filling, the seeds in the inner layer of the seed metering device do not directly interact with the composite perforated structure at the edge of the seed metering disc. The inner layer seeds remain relatively stationary, while the outer layer seeds move relative to the perforated structure, gradually filling the composite perforations under the influence of filling force. Therefore, when the seeder does not have a guide plate, the inner layer seeds are less driven, and mutual restraint forces form between the seeds, leading to arching above the perforated structure, making it difficult to ensure reliable seed filling. Furthermore, as the seed metering device's speed increases, the inner layer seeds begin to move slowly under the influence of the outer layer seeds, but the friction between the seeds hinders this movement, reducing the speed of the seeds relative to the seed meterer and shortening the effective filling time, which is detrimental to filling. Therefore, existing technologies have designed linear guide plates. However, the edges of linear guide plates often damage the seeds during seed movement, and linear guide plates do not effectively drive the seed mass movement.

[0004] Therefore, it is essential to design a seed metering device that can ensure seed filling efficiency, seed metering accuracy, and prevent seed damage. Utility Model Content

[0005] The purpose of this invention is to provide a seed metering device with an arc-shaped guide plate. By designing the guide plate as an arc-shaped guide plate, the seed metering device can better drive the movement of the seed population, thereby ensuring seed filling efficiency and seed metering accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A seed metering device with an arc-shaped guide plate includes a front housing, an arc-shaped guide plate, a seed metering disc, a rear housing, and a connecting shaft. The arc-shaped guide plate, the seed metering disc, and the rear housing are connected sequentially via the connecting shaft. The arc-shaped guide plate includes a fixed base, an arc-shaped guide rod, and a circular guide plate. One end of the arc-shaped guide rod is connected to the fixed base, and the other end of the arc-shaped guide rod is connected to the circular guide plate. The seed metering disc is provided with a plurality of evenly distributed composite holes.

[0008] Optionally, the convex surface of the arc-shaped guide rod faces the rotation direction of the seed metering disc, and the plane of the circular guide plate is perpendicular to the rotation direction of the seed metering disc.

[0009] Optionally, the number of the arc-shaped guide rods is four, and the interval angle between each arc-shaped guide rod is 90 degrees.

[0010] Optionally, a seed inlet tube is provided on one side of the front housing, one end of the seed inlet tube is a seed inlet, and the other end of the seed inlet tube is a beveled surface. The seed inlet tube communicates with the front housing through the seed inlet, and the seed inlet is located on the lower side of the front housing. A seed drop outlet is provided on the lower edge of the front housing.

[0011] Optionally, the seed metering device further includes a seed guard plate, which is an arc-shaped cavity with an opening. The seed guard plate covers the composite hole and cooperates with the seed dropping port to drop the seed.

[0012] Optionally, the seed metering device further includes a worm gear, a worm, and a motor; one end of the connecting shaft passes through the fixed base, the other end of the connecting shaft is fitted with the worm gear, the worm is meshed with the worm gear, and the motor is connected to the worm.

[0013] Optionally, the seeding disc includes a conical disc and a circular disc, the composite holes are evenly distributed along the edge of the circular disc, and the tip of the conical disc faces the arc-shaped guide plate.

[0014] Optionally, the composite hole includes a convex arc-shaped triangular prism and a groove. The convex arc-shaped triangular prism is mounted above one side of the groove, and the groove is set as a concave arc surface on the side away from the convex arc-shaped triangular prism. The composite holes are arranged in a uniform sequence.

[0015] Optionally, the bottom length of the groove is greater than the sum of the radius of the concave arc surface and the diameter of the seed.

[0016] Optionally, the arc surface direction of the convex arc triangular prism is the direction of the composite filling force of the seed; the composite filling force includes the gravity of the seed, the centrifugal force of the seed, the support force of the seed, the frictional force of the seed, the seed layer pressure along the x-axis component, and the seed layer pressure along the y-axis component.

[0017] According to the specific embodiments provided by this utility model, the following technical effects are disclosed:

[0018] This invention provides a seed metering device with an arc-shaped guide plate. The guide plate is positioned between the front housing and the seed metering disc, and is designed as an arc shape. Specifically, the arc-shaped guide plate includes a fixed base, an arc-shaped guide rod, and a circular guide plate. The convex surface of the arc-shaped guide rod faces the rotation direction of the seed metering disc. When the seed metering device rotates at high speed, it precisely gathers the seeds between the arc-shaped guide rods, increasing the seed movement speed. The plane of the circular guide plate is perpendicular to the rotation direction of the seed metering disc. When the seed metering device rotates at high speed, the plane of the circular guide plate always exerts the greatest force on a particular seed, effectively preventing damage to the seed from the edge of the circular guide plate. When rotating, the arc-shaped guide plate in this invention applies a certain circumferential thrust and radial pressure to the inner seed layer, which is transmitted from the inside to the outside seed layer, causing vigorous movement of the seeds throughout the filling area. This increases the filling force and relative movement speed of the seeds above the composite holes. Therefore, the arc-shaped guide plate of this utility model can effectively avoid seed damage and effectively improve the seed filling effect under high-speed operation compared with the existing straight guide plate.

[0019] This invention places the seed inlet tube on one side of the front housing and the seed inlet at the lower side of the front housing. Compared to existing technologies that place the seed inlet tube in the middle of the front housing or the seed inlet directly below the front housing, this design ensures that the seed colony is better driven to move. In this invention, because the seed inlet is located at the lower side, the seeds enter the seed metering device through the seed inlet, and the circumferential thrust of the arc-shaped guide plate can promptly offset part of the weight of the seed colony, causing the seed colony to be immediately driven to rotate. However, if the seed inlet is located directly below the front housing, the circumferential movement of the guide plate cannot offset the weight of the seed colony in time. As a result, the seed colony will first accumulate and stagnate under the influence of gravity before rotating, which will also exert temporary pressure on the guide plate and affect the overall movement of the seed colony.

[0020] This invention relates to a seed metering disc comprising a conical disc and a circular disc. The tip of the conical disc faces the arc-shaped guide plate, a design that allows the conical surface of the disc to also propel the seed population. The circular disc features a composite hole composed of a convex arc-shaped triangular prism and a groove. Seeds enter the groove through the convex arc-shaped triangular prism. The arc direction of the convex arc-shaped triangular prism is the direction of the composite filling force of the seed, a specific arc direction that facilitates seed entry into the groove. One side of the groove is a concave arc surface, which prevents the seed from rolling and being damaged within the groove. Furthermore, this invention sets the length of the bottom of the groove to be greater than the sum of the radius of the concave arc surface and the diameter of the seed. Compared to existing technologies that simply set the length of the bottom of the groove to be greater than the diameter of the seed, this design also considers the internal dimensions of the groove, thereby increasing the internal area of ​​the composite hole. This facilitates direct seed filling, ensuring complete seed entry into the composite hole, reducing missed seeding rate, and improving seed filling rate and qualification rate. Attached Figure Description

[0021] Figure 1 An exploded view of the seed metering device provided by this utility model;

[0022] Figure 2 A schematic diagram of the interior of the front housing provided by this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the arc-shaped guide plate provided by this utility model;

[0024] Figure 4 A schematic diagram of the seed metering disc provided by this utility model;

[0025] Figure 5 A front view of the seed metering disc provided by this utility model;

[0026] Figure 6 A side view of the seed metering disc provided by this utility model;

[0027] Figure 7 A schematic diagram of the structure of the composite hole provided by this utility model;

[0028] Figure 8 A schematic diagram showing the force direction of a single seed located on a convex arc-shaped triangular prism provided by this utility model;

[0029] Figure 9 A schematic diagram illustrating the velocity direction of a single seed located in a groove, provided by this utility model;

[0030] Figure 10 A schematic diagram of the population trajectory under the combined action of the arc-shaped guide plate and the seed metering disc provided by this utility model.

[0031] In the diagram, the components are: seed inlet tube-1, seed inlet-101, seed outlet-102, seed drop outlet-103, front shell-2, arc-shaped guide plate-3, fixed base-31, arc-shaped guide rod-32, circular guide plate-33, seed protection plate-4, seed discharge plate-5, conical plate-51, circular plate-52, rear shell-6, connecting shaft-7, worm gear-8, worm-shaft-9, motor-10, composite hole-11, convex arc triangular prism-111, groove-112, concave arc surface-113, and bottom of groove-114. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings:

[0033] like Figures 1 to 7As shown, this utility model provides a seed metering device with an arc-shaped guide plate. The seed metering device includes a seed inlet tube 1, a front housing 2, an arc-shaped guide plate 3, a seed guard plate 4, a seed metering disc 5, a rear housing 6, a connecting shaft 7, a worm gear 8, a worm 9, and a motor 10. The arc-shaped guide plate 3, the seed metering disc 5, and the rear housing 6 are connected sequentially by the connecting shaft 7. One end of the connecting shaft 7 passes through the arc-shaped guide plate 3, and the other end of the connecting shaft 7 is fitted with the worm gear 8. The worm 9 is engaged with the worm gear 8, and the motor 10 is connected to the worm 9. The worm 9 and the motor 10 are assembled as a whole. The motor 10 provides power to drive the seed metering device to perform the sowing operation, wherein the seed metering disc 5 and the arc-shaped guide plate 3 rotate together. The seed inlet tube 1 is located on one side of the front housing 2. One end of the seed inlet tube 1 is the seed inlet 101, and the other end is a beveled surface. The seed inlet tube 1 is connected to the front housing 2 through the seed inlet 102, which is located on the lower side of the front housing 2. The placement of the seed inlet tube 1 on one side of the front housing 2 and the lower side of the seed inlet 102 ensures that the seed population is better driven. A seed drop outlet 103 is provided along the lower edge of the front housing 2. Seeds fall into the seed area from the seed drop outlet 103 as the seeder moves. The seed metering disc 5 is provided with several evenly distributed composite holes 11. Seeds must pass through the composite holes 11 before falling from the seed drop outlet 103.

[0034] The arc-shaped guide plate 3 includes a fixed base 31, an arc-shaped guide rod 32, and a circular guide plate 33. One end of the connecting shaft 7 passes through the fixed base 31, one end of the arc-shaped guide rod 32 is connected to the fixed base 31, and the other end of the arc-shaped guide rod 32 is connected to the circular guide plate 33. The convex surface of the arc-shaped guide rod 32 faces the rotation direction of the seed metering disc 5, and the plane of the circular guide plate 33 is perpendicular to the rotation direction of the seed metering disc 5. When rotating, the arc-shaped guide plate 3 of this invention applies a certain circumferential thrust and radial pressure to the inner seed population, which is transmitted from the inside to the outside seed population, causing the seed population in the entire filling area to move violently, thereby increasing the filling force and relative movement speed of the seeds to be filled above the composite hole 11. To maintain balance, there are at least two arc-shaped guide rods 32, and the interval angle of each arc-shaped guide rod 32 is equal. As a specific embodiment, there are four arc-shaped guide rods 32, and the interval angle between each arc-shaped guide rod 32 is 90 degrees. The filling effect is best when the interval angle between the arc-shaped guide rods 32 is 90 degrees.

[0035] The seed protection plate 4 is an arc-shaped cavity with an opening. The seed protection plate 4 covers the composite hole 11 and cooperates with the seed dropping port 103 to drop seeds.

[0036] The seed metering tray includes a conical tray 51 and a circular tray 52. ​​The tip of the conical tray 51 faces the arc-shaped guide plate 3. Composite holes 11 are evenly distributed along the edge of the circular tray 52, and the composite holes 11 are arranged sequentially and evenly. Each composite hole 11 includes a convex arc-shaped triangular prism 111 and a groove 112. The convex arc-shaped triangular prism 111 is positioned above one side of the groove 112. The groove 112 has a concave arc surface 113 on the side away from the convex arc-shaped triangular prism 111, and the concave arc surface 113 is the seeding area of ​​the composite hole 11. The length of the bottom 114 of the groove is greater than the sum of the radius of the concave arc surface 113 and the diameter of the seed, which increases the internal area of ​​the composite hole 11, facilitating direct filling of the seed and ensuring that the seed completely enters the composite hole 11. The direction of the arc surface of the convex arc triangular prism 111 is the direction of the composite filling force of the seed; the composite filling force includes the gravity of the seed, the centrifugal force of the seed, the support force of the seed, the frictional force of the seed, the seed layer pressure along the x-axis component and the seed layer pressure along the y-axis component.

[0037] Furthermore, taking the critical state of a single seed falling onto the arc surface of a convex arc-shaped triangular prism 111 as the research object, when the seed contacts the convex arc-shaped triangular prism 111, the seed and the mortise mainly fill the mortise along the arc surface in a relative motion manner, and the force on the seed is as follows: Figure 8 As shown, a first rectangular coordinate system is established with the tangent of the arc surface as the x-axis and the normal as the y-axis. The resultant force on the seed along the x-axis is the composite filling force when the seed is filled. Among them, G is the gravity of the seed, Fr is the centrifugal force of the seed, Fn is the support force of the seed, f is the frictional force of the seed, Fx is the component of the seed layer pressure along the x-axis, Fy is the component of the seed layer pressure along the y-axis, and V is the direction of seed movement.

[0038] Furthermore, under the action of the composite filling force, the seeds move to the seeding area, and the velocity directions of the seeds and the seeder are as follows: Figure 9 As shown, a second rectangular coordinate system is established with the forward direction of the seeder as the x-axis and the vertically downward direction as the y-axis. Here, V0 is the velocity of the seed in the direction of movement, V0x is the velocity of the seed along the x-axis, V0y is the velocity of the seed along the y-axis, and V is the velocity of the seeder in the forward direction.

[0039] The working process of a seed metering device can be divided into four stages: seed filling, seed cleaning, seed delivery, and seed placement. When the seed metering device is working, the seed stock enters the seed chamber through the seed inlet pipe. Under the combined rotational pressure of the seed metering disc and the arc-shaped guide plate, the seed stock begins to move vigorously, forming a rising, circulating seed layer, thus completing the seed filling process. Figure 10The arrows indicate the rotation direction of the arc-shaped guide plate and the seed metering disc, representing the movement trajectory of the seed population. The seed population then enters the composite orifice primarily through the combined filling force of its own gravity, centrifugal force, and the pressure exerted between the seed populations by the arc-shaped guide plate, completing the seed filling process. After filling, the composite orifice rotates to a certain height and begins to clear the seeds. A small amount of excess seed, except for single seeds to be added, falls out of the orifice under its own gravity, completing the seed clearing process. Afterward, the seed population enters the area protected by the seed guard plate and rolls circumferentially into the seeding area within the composite orifice, stabilizing and completing the seed delivery process. Finally, the seeds rotate with the composite orifice to the seed drop outlet and fall into the seed bed, completing the seeding process. This seed metering device differs from traditional seed metering devices; it effectively improves the seed filling effect under high-speed operation through the combined action of the arc-shaped guide plate and the composite orifice.

[0040] This embodiment is merely an illustration of the concept and implementation of this utility model, and is not intended to limit it. Under the concept of this utility model, the technical solution without substantial changes is still within the protection scope.

Claims

1. A seed metering device with an arc-shaped guide plate, characterized in that, The seed metering device includes a front housing, an arc-shaped guide plate, a seed metering disc, a rear housing, and a connecting shaft. The arc-shaped guide plate, the seed metering disc, and the rear housing are connected sequentially via the connecting shaft. The arc-shaped guide plate includes a fixed base, an arc-shaped guide rod, and a circular guide plate. One end of the arc-shaped guide rod is connected to the fixed base, and the other end is connected to the circular guide plate. The seed metering disc is provided with a plurality of evenly distributed composite holes. Each composite hole includes a convex arc-shaped triangular prism and a groove. The convex arc-shaped triangular prism is positioned above one side of the groove, and the groove is set as a concave arc surface on the side away from the convex arc-shaped triangular prism. The composite holes are arranged sequentially and evenly. The bottom length of the groove is greater than the sum of the radius of the concave arc surface and the diameter of the seed.

2. The seed metering device with an arc-shaped guide plate according to claim 1, characterized in that, The convex surface of the arc-shaped guide rod faces the rotation direction of the seed metering disc, and the plane of the circular guide plate is perpendicular to the rotation direction of the seed metering disc.

3. The seed metering device with an arc-shaped guide plate according to claim 2, characterized in that, The number of arc-shaped guide rods is four, and the interval angle between each arc-shaped guide rod is 90 degrees.

4. The seed metering device with an arc-shaped guide plate according to claim 1, characterized in that, A seed inlet tube is provided on one side of the front housing. One end of the seed inlet tube is a seed inlet, and the other end of the seed inlet tube is a beveled surface. The seed inlet tube is connected to the front housing through the seed inlet, which is located on the lower side of the front housing. A seed drop outlet is provided along the lower edge of the front housing.

5. The seed metering device with an arc-shaped guide plate according to claim 4, characterized in that, The seed metering device also includes a seed protection plate, which is an arc-shaped cavity with an opening. The seed protection plate covers the composite hole and cooperates with the seed dropping port to drop the seed.

6. The seed metering device with an arc-shaped guide plate according to claim 1, characterized in that, The seed metering device also includes a worm gear, a worm, and a motor; one end of the connecting shaft passes through the fixed base, the other end of the connecting shaft is fitted with the worm gear, the worm is meshed with the worm gear, and the motor is connected to the worm.

7. The seed metering device with an arc-shaped guide plate according to any one of claims 1 to 6, characterized in that, The seeding disc includes a conical disc and a circular disc, with the composite holes evenly distributed along the edge of the circular disc, and the tip of the conical disc facing the arc-shaped guide plate.

8. The seed metering device with an arc-shaped guide plate according to claim 1, characterized in that, The arc direction of the convex arc triangular prism is the direction of the composite filling force of the seed; the composite filling force includes the gravity of the seed, the centrifugal force of the seed, the support force of the seed, the frictional force of the seed, the seed layer pressure along the x-axis component, and the seed layer pressure along the y-axis component.

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