Precise seed-metering device suitable for driving harrow seeder

Abstract

The utility model discloses a precision seed-metering device suitable for driving a harrow seeder, which relates to the technical field of agricultural production equipment, and comprises a roller, the roller is divided into an outer roller and an inner roller, the outer roller is attached and contacted with a seed box, two seed outlets are arranged at the bottom of the seed box, two sides of the inner roller are fixedly connected with two end covers, and the two end covers are fixedly connected with two ends of the inner roller. The two sides of the end cover are fixedly connected with the bearing seats respectively, the bearing seats and the bearings are attached and rotate together, the outer sides of the bearings are connected with the chain wheels in a sleeved mode, the inner sides of the bearings are connected with the central pipe shaft in a sleeved mode, the central pipe shaft is communicated with the bottoms of the positive pressure chamber and the negative pressure chamber respectively, and the tops of the positive pressure chamber and the negative pressure chamber are attached to the inner side of the roller. The seed metering device has the advantages of good seed metering uniformity, seed saving, no damage to seeds and the like. In addition, as a core component of the driving harrow seeder, the driving harrow and the seeder can be integrated and compounded.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural production equipment, and in particular to a precision seed metering device suitable for driving a harrow seeder. Background Art

[0002] Years of agricultural production practice have proven that in northern my country, driven harrows have more significant advantages than rotary tillers in terms of land preparation quality, such as plowing depth, and also have a more positive impact on crop emergence rate and later growth conditions, such as lodging resistance. Integrating driven harrows and seed drills into a single machine is a new trend in the development of agricultural machinery, and innovative research on precision seed meters is the core of promoting this technology. Among the many seed meters on the market, mechanical precision seed meters have the advantages of simple structure and low cost, but they suffer from poor uniformity, easy seed jamming, high seed damage rate, and inability to achieve high-speed operation. Pneumatic seed meters are all separate air suction or air pressure seed meters with a single function, which can easily cause problems such as missed seeds and repeated seeding, seriously affecting seeding efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a precision seed meter suitable for a driven harrow seeder, which has the advantages of good seeding uniformity, seed saving and no seed damage, and promotes the integration of the driven harrow and the seeder, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] The utility model provides a precision seed metering device suitable for driving a harrow seeder, comprising a roller, the roller being divided into an outer roller and an inner roller, the outer roller being in contact with a seed box, the seed box having two seed outlets at the bottom, the inner roller being fixedly connected to two end covers on both sides, the end covers being fixedly connected to bearing seats on both sides, the bearing seats being in contact with the bearings and rotating together, the outer side of the bearing being sleeved with a sprocket, the inner side of the bearing being sleeved with a center tube shaft, a positive air hole and a negative air hole being provided on the center tube shaft, the positive air hole being connected to one end of a positive pressure tube, the negative air hole being connected to one end of a negative pressure tube, the other end of the positive pressure tube being connected to the bottom of a positive pressure chamber, the other end of the negative pressure tube being connected to the bottom of a negative pressure chamber, the top of the positive pressure chamber being in contact with the inner side of the roller, and the top of the negative pressure chamber being in contact with the inner side of the roller.

[0006] Furthermore, the seed holes and the threaded holes are evenly distributed between the outer roller and the inner roller, and the seed holes are in the shape of straight holes.

[0007] Furthermore, the central tube shaft shares a common axis with the air inlets of the positive-pressure tube and the negative-pressure tube. The outermost end of the central tube shaft is used for connecting to an external fan, and a baffle is provided in the middle to achieve a middle partition.

[0008] Furthermore, the negative pressure chamber is wide in the middle area of the inner roller and gradually narrows on both sides; the positive pressure chamber is distributed at a certain angle to the inner roller. The reasonable cross-sectional shape of the positive and negative pressure chambers can make the air pressure distribution more uniform, which is beneficial to the roller to absorb and discharge seeds, reduce the energy consumption of the fan, reduce the reseeding rate and the missed seeding rate, and realize single-grain seeding.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] The present application provides a precision seeding device suitable for driving a harrow seeder, which adopts the principle of positive and negative pressure combination to avoid damage to seeds during mechanical seeding. During the entire seeding process, the seeds move under the action of airflow, which can greatly reduce the seed damage rate.

[0011] The present application provides a precision seeding device suitable for driving a harrow seeder. The seeding device changes the traditional seed strip sowing method and evenly distributes seeds in a sowing seedling belt of a certain width. It has the advantages of good seeding uniformity, seed saving and no seed damage.

[0012] The present application provides a precision seed meter suitable for a driven harrow seeder. The seed meter serves as a core component of the driven harrow seeder and can realize the integrated combination of the driven harrow and the seeder. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings constituting part of this application are used to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the right side structure of the utility model with the roller and end cover removed;

[0016] Figure 3 This is an overall internal cross-sectional view of the present utility model;

[0017] In the figure: 1. Seed box; 101. Seed outlet; 2. Outer roller; 3. Inner roller; 4. End cover; 5. Bearing; 6. Bearing seat; 7. Sprocket; 8. Positive pressure chamber; 9. Negative pressure chamber; 10. Positive pressure pipe; 11. Negative pressure pipe; 12. Center pipe shaft; 13. Seed hole; 14. Threaded hole; 15. Baffle; 16. Positive air hole; 17. Negative air hole. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] Reference Figure 1-Figure 3 As shown, this embodiment provides a precision seed metering device suitable for driving a harrow seeder, including a roller, the roller is divided into an outer roller 2 and an inner roller 3, the two are symmetrically distributed, the outer roller 2 is in contact with the seed box 1, and two seed outlets 101 are provided at the bottom of the seed box 1, the inner roller 2 is fixedly connected to two end covers 4 on both sides, the two end covers are symmetrically distributed, the end covers 4 are symmetrically distributed on both sides, and are respectively fixed to the bearing seat 6, the bearing seat 6 is in contact with the bearing 5, and rotates together, the bearing 5 is in contact with the outer roller 2, and the two end covers are symmetrically distributed. The side is connected with the sprocket 7 to realize power transmission, the inner side of the bearing 5 is connected with the central tube shaft 12, and the central tube shaft 12 is provided with a positive air hole 16 and a negative air hole 17. The positive air hole 16 is connected to one end of the positive pressure tube 10, and the negative air hole 17 is connected to one end of the negative pressure tube 11. The other end of the positive pressure tube 10 is connected to the bottom of the positive pressure chamber 8, and the other end of the negative pressure tube 11 is connected to the bottom of the negative pressure chamber 9. The top of the positive pressure chamber 8 is in contact with the inner roller 3, and the top of the negative pressure chamber 9 is in contact with the inner roller 3.

[0021] In the above embodiment, an array of circular holes, namely, seed holes 13 and threaded holes 14, are processed on the outer roller 2 and the inner roller 3 at equal intervals along the circumferential direction, and the seed holes are in the shape of straight holes.

[0022] In the above embodiment, the central tube shaft 12 shares a common axis with the air inlets of the positive pressure tube 10 and the negative pressure tube 11. The central tube shaft 12 mainly plays a supporting and ventilation role, connecting the positive pressure chamber 8 and the negative pressure chamber 9 respectively. A baffle 15 is set in the middle position to achieve the middle partition. The outermost end of the central tube shaft 12 is used for an external fan.

[0023] In the above embodiment, the negative pressure chamber 9 is wide in the middle area of the inner roller 3 and gradually narrows on both sides, so that the air pressure on both sides of the negative pressure chamber 9 and the air pressure in the center area can be as consistent as possible, ensuring that the seeds are always adsorbed on the outer roller 2; the positive pressure chamber 8 is distributed at a certain angle to the inner roller 3, which can ensure that the seeds can quickly separate from the outer roller 2, blow out impurities in the pores, and avoid clogging of the pores.

[0024] How it works

[0025] The utility model first uses a hose to connect the blower to the central tube axis 12 of the seed meter. Positive and negative air pressures are provided through a positive pressure tube 10 and a negative pressure tube 11, respectively. Circumferentially, the outer roller 2 and inner roller 3 are provided with arrays of equally spaced circular holes, namely, seed holes 13 and threaded holes 14. The negative pressure chamber 9 is wide in the middle and gradually narrows toward the sides, accelerating the air flow rate on both sides of the negative pressure chamber 9 and decreasing it in the center, ensuring that the air pressure within the radial cross-section of the negative pressure chamber 9 is essentially the same. The external atmospheric pressure of the seed meter forms an airflow channel through the seed holes 13 and the negative pressure chamber 9 to the blower. Air flows inward from the seed holes 13, accelerating its flow rate and adsorbing seeds onto the outer roller 2. Five annular seed belts are formed circumferentially on the outer and inner rollers 2 and 3. The rollers are connected to the end caps 4 via top screws. A sprocket 7 is mounted on one end cap 4 to transmit power. When the seed holes 13 rotate with the outer roller 2 to the seed box 1, negative pressure suction captures the seeds within the box 1. Once the outer roller 2 rotates to the appropriate position above the seed trench, the seeds, under the influence of positive pressure and gravity, escape from the seed holes 13 and fall into the seed trench, completing precision seeding. This structural design avoids damage to the seeds during mechanical seeding. The seeds are moved by airflow throughout the seeding process, significantly reducing seed damage.

[0026] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0027] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A precision seed metering device suitable for driving a harrow seeder, characterized by: The invention comprises a roller, wherein the roller is divided into an outer roller (2) and an inner roller (3), and the outer roller (2) is in contact with the seed box (1), and two seed outlets (101) are provided at the bottom of the seed box (1). The inner roller (3) is fixedly connected to two end covers (4) on both sides, and the two end covers are symmetrically distributed. The end covers (4) are symmetrically distributed on both sides and are respectively fixedly connected to the bearing seat (6). The bearing seat (6) is in contact with the bearing (5) and rotates together. The outer side of the bearing (5) is sleeved with the sprocket (7) to realize power transmission. The inner side of the bearing (5) is sleeved with the central tube shaft (12), and a positive air hole (16) and a negative air hole (17) are provided on the central tube shaft (12). The positive air hole (16) is connected to one end of the positive pressure tube (10), and the negative air hole (17) is connected to one end of the negative pressure tube (11). The other end of the positive pressure tube (10) is connected to the bottom of the positive pressure chamber (8), and the other end of the negative pressure tube (11) is connected to the bottom of the negative pressure chamber (9). The top of the positive pressure chamber (8) is in contact with the inner roller (3), and the top of the negative pressure chamber (9) is in contact with the inner roller (3).

2. A precision seed metering device suitable for driving a harrow seeder according to claim 1, characterized in that: Arrayed circular holes, namely seed holes (13) and threaded holes (14), are machined at equal intervals on the outer roller (2) and the inner roller (3) along the circumferential direction. The seed holes (13) are in the shape of straight holes.

3. A precision seed metering device suitable for driving a harrow seeder according to claim 1, characterized in that: The central tube shaft (12) shares a common axis with the air inlets of the positive pressure tube (10) and the negative pressure tube (11). The central tube shaft (12) mainly plays a supporting and ventilation role, and is connected to the positive pressure chamber (8) and the negative pressure chamber (9) respectively. A baffle (15) is set in the middle position to realize the middle partition. The outermost end of the central tube shaft (12) is used for an external fan.

4. A precision seed metering device suitable for driving a harrow seeder according to claim 1, characterized in that: The negative pressure chamber (9) is wide in the middle area of the inner roller (3) and gradually narrows on both sides, so that the air pressure on both sides of the negative pressure chamber (9) and the air pressure in the center area can be as consistent as possible, ensuring that the seeds are always adsorbed on the roller; the positive pressure chamber (8) is distributed at a certain angle to the inner roller (3), which can ensure that the seeds can quickly separate from the outer roller (2) and blow out impurities in the pores to avoid clogging of the pores.

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