Rice seed screening device

Abstract

The utility model relates to rice seed screening technical field discloses a rice seed screening device, including screening box, the inside of screening box is opened with primary screening cavity and re -screening cavity, and the top surface of screening box is connected with the feeding hopper of fixed communication, and the inside of screening box is provided with the screening structure for screening rice seed. The utility model discloses the setting of screening structure, and it cooperates through the first screen and second screen in the primary screening stage, and first separates the qualified small particle seed and intercepts oversized impurity, and then innovatively utilizes the auger lifting mechanism and transports the big particle seed after primary screening to re -screening cavity, and carries out secondary screening through third screen, and separates the small particle seed being enwrapped, and this automatic secondary screening process realizes the on -line purification of big particle seed, and significantly improves product purity, and need not stop work, and greatly improves production efficiency while guaranteeing the classification quality, and effectively reduces energy consumption and artificial cost.

Description

Technical Field

[0001] This utility model relates to the field of rice seed screening technology, and in particular to a rice seed screening device. Background Technology

[0002] In modern rice breeding and cultivation, seeds are often graded according to their size. On the one hand, large, plump, and uniform seeds usually have a higher thousand-grain weight and germination potential, which is the foundation for cultivating strong seedlings and ensuring high yields. On the other hand, separating seeds of different sizes for sowing helps to achieve uniform seedling growth in the field, facilitates mechanized management, and promotes unified harvesting. Therefore, accurately sieving rice seeds into large and small particles according to size is a key step in improving agricultural production efficiency and the commercial value of seeds.

[0003] Currently, the screening technology commonly used in this field is a combination of air separation and mechanical screening. First, the air separation device uses the difference in air density to remove light impurities mixed in with the seeds, such as husks, dust, and chaff. Then, the screening body usually uses a vibrating screen or drum screen. By configuring screens with different aperture sizes, smaller seeds and impurities pass through the screen holes, while larger seeds move along the screen surface and are discharged from a specific outlet, thus achieving the initial separation of large and small seeds.

[0004] However, the aforementioned existing technology has a significant drawback in continuous operation: because the material is in a state of high-speed vibration and dense flow during the screening process, larger seed particles are very likely to carry or entrain some smaller seed particles during movement, causing them to fail to pass through the predetermined screen holes and enter the large particle sorting pile together. This "entrainment" phenomenon results in a large number of small seed particles that should have been screened out being mixed into the large seed particle aggregate, which seriously affects the grading purity. This not only makes the final product substandard, but also forces operators to frequently stop the machine during long-term operation, and re-enter the mixed material into the equipment for secondary or even multiple screenings, which greatly restricts production efficiency and increases additional energy consumption and labor costs. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a rice seed screening device.

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

[0007] A rice seed screening device includes a screening box with a primary screening cavity and a secondary screening cavity inside. A feed hopper is fixedly connected to the top surface of the screening box. The screening box is equipped with a screening structure for screening rice seeds. The screening structure includes a first screen inclinedly disposed inside the screening box, a second screen inclinedly disposed below the first screen, and a sliding plate inclinedly disposed between the first and second screens. The bottom surface of the primary screening cavity is inclined, and a conveying cylinder is fixedly disposed inside the primary screening cavity. An auger is rotatably disposed inside the conveying cylinder. Fixed notches are respectively opened at the top and bottom of the conveying cylinder. The fixed notch at the top is located in the secondary screening cavity, and a third screen is inclinedly disposed inside the secondary screening cavity.

[0008] As a further embodiment of this utility model, a first motor is fixed to the top surface of the screening box. The output end of the first motor passes through the top surface of the screening box and is fixed to the top of the auger. The bottom surface of the secondary screening cavity is an inclined surface. The right ends of the first screen, the second screen, and the third screen are rotatably arranged with the inner walls of the primary screening cavity and the secondary screening cavity, respectively. Two rotating rods are rotatably arranged inside the screening box. Several movable rings are fixed to the outer circular wall surface of the two rotating rods. A trigger block is fixed to the top surface of the movable ring. The top surface of the trigger block is an inclined surface. The top surfaces of the several movable rings are respectively attached to the bottom surfaces of the corresponding first screen, the second screen, and the third screen. Several tension springs are fixed inside the screening box. The tops of the several tension springs are respectively fixed to the bottom surfaces of the corresponding first screen, the second screen, and the third screen.

[0009] As a further embodiment of this utility model, a second motor is fixed inside the screening box. The output end of the second motor is fixed to the bottom end of the rotating rod on the right side. Sprockets are fixed on the outer circular walls of both rotating rods, and a chain meshes between the two sprockets.

[0010] As a further embodiment of this utility model, an air separator is fixedly connected to one side of the screening box, and the air separator corresponds to the discharge point of the feed hopper.

[0011] As a further embodiment of this utility model, a discharge trough is provided on one side of the screening box. The discharge trough is connected to the interior of the double screening cavity. A discharge plate is fixed inside the discharge trough. The bottom surfaces of both the discharge plate and the discharge trough are inclined surfaces.

[0012] As a further embodiment of this utility model, two discharge holes are provided on one side of the screening box, and the two discharge holes correspond to the positions of the sliding plate and the third screen, respectively.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This rice seed screening device effectively solves the problem of insufficient purity of large seeds caused by the "entrainment" phenomenon in traditional processes through its screening structure. In the initial screening stage, the first and second screens work together to separate qualified small seeds and intercept oversized impurities. Then, an innovative auger lifting mechanism is used to transport the mixed large seeds after the initial screening to the secondary screening cavity, where they are screened a second time through a third screen to separate the entrained small seeds. This automated secondary screening process realizes online purification of large seeds, significantly improves product purity, eliminates the need for downtime and rework, and greatly improves production efficiency while ensuring grading quality and effectively reducing energy consumption and labor costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a rice seed screening device proposed in this utility model;

[0016] Figure 2 This is a cross-sectional view of a rice seed screening device proposed in this utility model.

[0017] Figure 3 This utility model proposes a rice seed screening device. Figure 2 Enlarged structural diagram at point A;

[0018] Figure 4 This utility model proposes a rice seed screening device. Figure 2 A magnified structural diagram at point B in the middle.

[0019] In the diagram: 1. Screening box; 2. Primary screening cavity; 201. First screen; 202. Second screen; 203. Sliding plate; 204. Conveying cylinder; 205. Screwdriver; 206. Fixed notch; 207. Third screen; 3. Secondary screening cavity; 301. First motor; 302. Rotating rod; 303. Movable ring; 304. Trigger block; 305. Tension spring; 4. Feed hopper; 401. Second motor; 402. Sprocket; 403. Chain; 5. Air separator; 6. Discharge chute; 601. Discharge plate; 7. Discharge hole. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Reference Figures 1-4A rice seed screening device includes a screening box 1, which has a primary screening cavity 2 and a secondary screening cavity 3 inside. A feed hopper 4 is fixedly connected to the top surface of the screening box 1. The screening box 1 has a screening structure for screening rice seeds, including a first screen 201 inclined inside the screening box 1, a second screen 202 inclined below the first screen 201, and a sliding plate 203 inclined between the first screen 201 and the second screen 202. The bottom surface of the primary screening cavity 2 is inclined, and a conveying cylinder 204 is fixed inside the primary screening cavity 2. An auger 205 is rotatably installed inside the conveying cylinder 204. Fixed notches 206 are respectively opened at the top and bottom of the conveying cylinder 204. The fixed notch 206 at the top is located inside the secondary screening cavity 3. A third screen 207 is inclined inside the secondary screening cavity 3, and the aperture of the second screen 202 is larger than that of the first screen 201. The aperture of the third screen 207 is the same as that of the first screen 201. Rice seeds enter the primary screening cavity 2 through the feed hopper 4. The first screen 201 screens the seeds, separating large and small seeds. Large seeds that do not pass through the screen and some small seeds that are trapped slide from the first screen 201 onto the second screen 202. Small seeds that pass through the screen fall onto the slide plate 203 and slide out of the screening box 1. The second screen 202 screens the large seeds and impurities with a diameter larger than the large seeds. The large seeds and trapped small seeds fall through the second screen 202 onto the bottom surface of the primary screening cavity 2 and slide to the fixed notch 206 at the bottom of the conveyor cylinder 204 and accumulate. The auger 205 conveys the seeds to the top of the conveyor cylinder 204 and discharges them. The large seeds and trapped small seeds fall onto the top surface of the third screen 207, which continues to screen the large seeds and trapped small seeds.

[0024] In this embodiment, a first motor 301 is fixed to the top surface of the screening box 1. The output end of the first motor 301 passes through the top surface of the screening box 1 and is fixed to the top end of the auger 205. The bottom surface of the secondary screening cavity 3 is an inclined surface. The right ends of the first screen 201, the second screen 202, and the third screen 207 are rotatably arranged with respect to the inner walls of the primary screening cavity 2 and the secondary screening cavity 3, respectively. Two rotating rods 302 are rotatably arranged inside the screening box 1. Several movable rings 303 are fixed to the outer circular wall of each of the two rotating rods 302. A trigger block 304 is fixed to the top surface of the movable ring 303. The top surface of the trigger block 304 is an inclined surface. The top surfaces of the several movable rings 303 are respectively connected with the corresponding first screen 201, second screen 202, and third screen 207. The bottom surfaces of the second screen 202 and the third screen 207 are attached to each other. Several tension springs 305 are fixed inside the screening box 1. The tops of the tension springs 305 are respectively fixed to the bottom surfaces of the corresponding first screen 201, second screen 202 and third screen 207. The first motor 301 drives the auger 205 to rotate to transport the seeds. The two rotating rods 302 drive the corresponding movable rings 303 to rotate. When the movable rings 303 rotate, the trigger block 304 contacts the corresponding screen and lifts it up, stretching the tension springs 305. When the trigger block 304 moves away from the corresponding screen, the tension springs 305 contract, thereby causing the first screen 201, second screen 202 and third screen 207 to shake, improving the seed screening effect.

[0025] In this embodiment, a second motor 401 is fixed inside the screening box 1. The output end of the second motor 401 is fixed to the bottom end of the rotating rod 302 on the right side. A sprocket 402 is fixed on the outer circular wall of both rotating rods 302. A chain 403 meshes between the two sprockets 402. When the second motor 401 is started, it drives the rotating rod 302 on the right side to rotate. Through the transmission of the chain 403 and the sprocket 402, the rotating rod 302 on the left side also rotates.

[0026] In this embodiment, an air separator pipe 5 is fixedly connected to one side of the screening box 1. The air separator pipe 5 corresponds to the discharge position of the feed hopper 4. The air separator pipe 5 is connected to an external air separator device (not shown in the figure). This air separator device usually includes a settling chamber and a centrifugal fan, which is common knowledge in the field. When the seeds are discharged through the feed hopper 4, the external air separator is activated. The air separator pipe 5 sucks up the light impurities mixed with the seeds being discharged and discharges them from the screening box 1.

[0027] In this embodiment, a discharge chute 6 is provided on one side of the screening box 1. The discharge chute 6 is connected to the interior of the double screening cavity 3. A discharge plate 601 is fixed inside the discharge chute 6. The bottom surfaces of the discharge plate 601 and the discharge chute 6 are both inclined surfaces. When the seeds inside the double screening cavity 3 are screened, the large and small seeds are discharged through the discharge chute 6 and the discharge plate 601.

[0028] In this embodiment, two discharge holes 7 are provided on one side of the screening box 1. The two discharge holes 7 correspond to the positions of the sliding plate 203 and the third screen 207, respectively. Most small seeds and large-diameter impurities are discharged through the two discharge holes 7 after screening.

[0029] Working principle: During use, the staff put rice seeds into the screening box 1 through the feed hopper 4, and then start the external air separation equipment. The ventilation pipe 5 connected to one side of the screening box 1 generates suction. When the rice seeds enter the device from the feed hopper 4, during the falling process, the air separation pipe 5 will suck up and discharge the light impurities they carry, such as dust and chaff, to achieve preliminary cleaning.

[0030] The seeds, after being air-separated, then enter the primary screening cavity 2 and fall onto the first screen 201. At this time, the two rotating rods 302, driven by the second motor 401 and driven by the sprocket 402 and chain 403, begin to work. The movable ring 303 on the rotating rod 302 rotates counterclockwise. When the trigger block 304 on the top surface of the movable ring 303 contacts and lifts the screen, the tension spring 305 is stretched. When the trigger block 304 rotates away, the tension spring 305 retracts back to its original position. This process occurs periodically, causing the first screen 201, the second screen 202, and the third screen 207 to continuously vibrate.

[0031] Under the shaking action of the first screen 201, small seeds of qualified size are screened out, fall onto the slide plate 203, and are finally discharged from the device through a discharge hole 7, becoming a first-level qualified product. Large seeds that fail to pass the screen, as well as some small seeds that are trapped by it, slide down the inclined surface of the first screen 201 onto the second screen 202. The aperture of the second screen 202 is larger than that of the first screen 201. Its main function is to intercept impurities that are too large. These large impurities slide out from the second screen 202 and are discharged through another discharge hole 7. The large seeds that pass through the second screen 202 and the small seeds they trap fall onto the inclined bottom surface of the primary screening cavity 2.

[0032] The mixed seeds collected at the bottom of the primary screening cavity 2 slide under the action of gravity and enter the conveying cylinder 204 through the fixed notch 206 at the bottom. The first motor 301 starts and drives the auger 205 inside the conveying cylinder 204 to rotate, lifting the mixed seeds upward. The seeds are discharged from the fixed notch 206 at the top of the conveying cylinder 204 and enter the secondary screening cavity 3, and are evenly distributed on the top surface of the third screen 207.

[0033] In the secondary screening cavity 3, the third screen 207 performs secondary screening under vibration. Its aperture is the same as that of the first screen 201, which can effectively screen out the small seeds that were previously trapped. Finally, all the pure large seeds that remain on the third screen 207, as well as the secondary small seeds that have been screened out, slide along the inclined screen surface and are discharged through the discharge chute 6 and the discharge plate 601 to complete the entire screening process.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A rice seed screening device, comprising a screening box (1), characterized in that: The screening box (1) has a primary screening cavity (2) and a secondary screening cavity (3) inside. The top surface of the screening box (1) is connected to and fixed with a feed hopper (4). The screening box (1) is equipped with a screening structure for screening rice seeds. The screening structure includes a first screen (201) inclined inside the screening box (1), a second screen (202) inclined below the first screen (201), and a sliding plate (203) inclined between the first screen (201) and the second screen (202). The bottom surface of the primary screening cavity (2) is an inclined surface. A conveying cylinder (204) is fixed inside the primary screening cavity (2). An auger (205) is rotatably installed inside the conveying cylinder (204). A fixed notch (206) is opened at the top and bottom of the conveying cylinder (204). The fixed notch (206) at the top is located in the secondary screening cavity (3). A third screen (207) is inclined inside the secondary screening cavity (3).

2. The rice seed screening device according to claim 1, characterized in that, The top surface of the screening box (1) is fixed with a first motor (301). The output end of the first motor (301) passes through the top surface of the screening box (1) and is fixed to the top of the auger (205). The bottom surface of the secondary screening cavity (3) is an inclined surface. The right ends of the first screen (201), the second screen (202) and the third screen (207) are rotatably arranged with respect to the inner walls of the primary screening cavity (2) and the secondary screening cavity (3), respectively. The screening box (1) is rotatably arranged with two rotating rods (302). The outer circular walls of the two rotating rods (302) are fixed with Several movable rings (303) are provided, and a trigger block (304) is fixed on the top surface of each movable ring (303). The top surface of the trigger block (304) is an inclined surface. The top surfaces of the several movable rings (303) are respectively attached to the bottom surfaces of the corresponding first screen (201), second screen (202) and third screen (207). Several tension springs (305) are fixed inside the screening box (1). The top ends of the several tension springs (305) are respectively fixed to the bottom surfaces of the corresponding first screen (201), second screen (202) and third screen (207).

3. The rice seed screening device according to claim 2, characterized in that, The screening box (1) is equipped with a second motor (401). The output end of the second motor (401) is fixed to the bottom end of the rotating rod (302) on the right side. Both rotating rods (302) have sprockets (402) fixed on their outer circular walls. A chain (403) meshes between the two sprockets (402).

4. The rice seed screening device according to claim 3, characterized in that, One side of the screening box (1) is connected to and fixed with an air separator (5), and the air separator (5) corresponds to the discharge point of the feed hopper (4).

5. A rice seed screening device according to claim 4, characterized in that, The screening box (1) has a discharge trough (6) on one side. The discharge trough (6) is connected to the interior of the double screening cavity (3). The discharge plate (601) is fixed inside the discharge trough (6). The bottom surfaces of the discharge plate (601) and the discharge trough (6) are both inclined surfaces.

6. The rice seed screening device according to claim 5, characterized in that, The screening box (1) has two discharge holes (7) on one side, and the two discharge holes (7) correspond to the positions of the sliding plate (203) and the third screen (207) respectively.

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