Screening mechanism of grain combine harvester

Abstract

The utility model relates to the field of grain combine harvesters, and discloses a grain combine harvester screening mechanism which comprises a screening barrel and a feeding port, the feeding port is formed in the left side of the top end of the screening barrel, the outer wall of the feeding port is fixedly connected with a material blocking motor, and an output shaft of the material blocking motor is fixedly connected with a rotary blocking frame. The rotary blocking frame is located in the feeding port. According to the screening mechanism of the grain combine harvester, the rotary blocking frame is arranged, when threshed grains enter the feeding port, the rotary blocking frame rotates to block the grains, continuous and uniform conveying of materials is guaranteed, meanwhile, a negative pressure suction environment is formed in the winnowing channel through the negative pressure draught fan, light grain husks and dust are raised due to the height difference, and therefore the grain husks and dust are separated from the winnowing channel. When grains are screened, the grains directly enter the winnowing channel and are sucked into the treatment box by the negative pressure fan for centralized treatment, so that the screening purity of the grains is improved, light grain hulls and dust are screened out, and the problem that the light grain hulls and dust cannot be screened out is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of grain combine harvesters, in particular to a screening mechanism of a grain combine harvester. Background Technique

[0002] Grain combine harvesters are mainly used for harvesting, threshing and cleaning crops. Generally speaking, after harvesting and threshing by a grain combine harvester, the grains will enter the screening process, and are screened by vibration to remove light impurities and heavy impurities, leaving clean grains, and then are conveyed to a material box or a storage bin through a material pipeline.

[0003] At present, most of the screening mechanisms of grain combine harvesters on the market directly adopt the mechanical vibration screening method. Grains and impurities enter the screening device together without effective pretreatment, which easily causes the situation of mixing impurities, husks and grains. Due to the lack of prior air separation or pre-screening treatment, lighter impurities such as rice husks and dust are easily thrown up by the vibration of the sieve plate, which instead affects the screening efficiency of the grains, causes incomplete screening, and increases the difficulty of subsequent treatment.

[0004] Therefore, a screening mechanism for a grain combine harvester is needed to solve the above technical defects. Content of the Utility Model

[0005] The purpose of the utility model is to provide a screening mechanism of a grain combine harvester to solve the problem that lighter grain husks and dust cannot be screened out as mentioned in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A screening mechanism of a grain combine harvester, including a screening cylinder and a feeding port. The left side of the top of the screening cylinder is provided with a feeding port. A baffle motor is fixedly connected to the outer wall of the feeding port. The output shaft of the baffle motor is fixedly connected with a rotating baffle. The rotating baffle is located inside the feeding port. The right side of the bottom of the feeding port is communicated with an air separation channel. The air separation channel is located at the top of the inner wall of the screening cylinder. A baffle is fixedly connected to the bottom of the air separation channel. A negative pressure fan is fixedly connected to the right side of the air separation channel. The output end of the negative pressure fan is fixedly connected with a dust exhaust pipe. The negative pressure fan is communicated with a treatment box through the dust exhaust pipe.

[0007] Preferably, the screening cylinder is a frame body composed of three arc-shaped plates, and the right side of the bottom of the feeding port is open.

[0008] Preferably, a screening motor is fixedly connected to the outer wall of the screening cylinder, the output shaft of the screening motor is fixedly connected to an eccentric position of the turntable, an activity frame is movably sleeved outside the turntable, a set of activity rods are welded on each of the left and right sides of the activity frame, a first sieve plate is fixedly connected to the bottom ends of the activity rods, a second sieve plate is arranged below the first sieve plate, and spring seats are respectively installed on the left sides of the first sieve plate and the second sieve plate and the left inner wall of the screening cylinder.

[0009] Preferably, a connecting rod is fixedly connected between the first sieve plate and the second sieve plate, and two groups of connecting rods are arranged and obliquely support the two ends of the first sieve plate and the second sieve plate respectively.

[0010] Preferably, a shaft sleeve is welded on the inner wall of the screening cylinder, and the activity rod moves left and right in the shaft sleeve.

[0011] Preferably, a spray head is fixedly connected to one side of the top end of the inner wall of the treatment box, a water pump is fixedly connected to the outer wall of the treatment box, a water tank is installed at the bottom end of the treatment box, a suction pipe is connected between the water pump and the water tank, and the output end of the water pump is connected to the spray head.

[0012] Preferably, channels are arranged on the right sides of the first sieve plate and the second sieve plate, the channels are respectively fixedly connected in the screening cylinder, discharge pipes are respectively arranged on the right sides of the channels, and the discharge pipes are respectively connected into a first material box and a second material box at the bottom end of the screening cylinder.

[0013] Preferably, a through groove is opened at the bottom end of the screening cylinder, a slag plate is arranged below the through groove, and the slag plate is obliquely arranged.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: The screening mechanism of this grain combine harvester not only realizes the screening of lighter grain husks and dust, realizes the combination of winnowing and water spraying, more effectively separates the grain husks and dust, but also realizes three-layer screening and long-time operation;

[0015] (1) By providing a rotating baffle, a negative pressure fan, a winnowing channel and a treatment box, when the threshed grains enter the feeding port, the rotating baffle rotates to block the grains, ensuring the continuous and uniform conveying of the materials. At the same time, the negative pressure fan forms a negative pressure suction environment in the winnowing channel. When the grains fall onto the first sieve plate from the lower right of the feeding port, the lighter grain husks and dust are lifted due to the height difference and directly enter the winnowing channel, and are sucked into the treatment box by the negative pressure fan for centralized treatment, improving the screening purity of the grains and realizing the screening of lighter grain husks and dust;

[0016] (2) By providing a water pump, a suction pipe, a water tank, and a spray head, the water pump extracts the spray water in the water tank through the suction pipe and evenly sprays it into the treatment tank through the spray head. The air-selected materials entering the treatment tank are sprayed with water mist, which can cause the incompletely removed husks and skins to settle due to moisture, increasing their weight, so that they can be more effectively separated from the grain system, ensuring the purity of the final grain screening. By combining air selection with water spraying, the screening efficiency is improved;

[0017] (3) By providing a screening motor, a turntable, a movable frame, a first sieve plate, a second sieve plate, a chute, a discharge pipe, a slag plate, a first material box, a second material box, and a spring seat, when the screening motor drives the turntable to rotate, it drives the movable frame to continuously move back and forth left and right. Then, through the movable rod, it drives the first sieve plate to form a high-speed reciprocating screening. The grains that do not pass through the pores of the first sieve plate enter the discharge pipe from the chute and are introduced into the first material box, while the grains that pass through the pores of the second sieve plate enter the second material box. The finally screened particles fall from the through groove onto the slag plate and are discharged. During the screening process, the spring seat reduces the vibration impact between the first sieve plate and the second sieve plate, effectively protecting the sieve plates from being damaged, and is particularly suitable for long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front sectional structure schematic diagram of the present utility model;

[0019] Figure 2 is a rear view structure schematic diagram of the turntable of the present utility model;

[0020] Figure 3 is of the present utility model Figure 1 is a partial sectional enlarged structure schematic diagram at A in;

[0021] Figure 4 is a front sectional structure schematic diagram of the treatment tank of the present utility model.

[0022] In the figure: 1, feeding port; 2, rotating retaining frame; 3, retaining motor; 4, air selection channel; 5, baffle; 6, negative pressure fan; 7, dust exhaust pipe; 8, treatment tank; 9, water pump; 10, spray head; 11, suction pipe; 12, water tank; 13, first material box; 14, second material box; 15, discharge pipe; 16, chute; 17, second sieve plate; 18, first sieve plate; 19, connecting rod; 20, slag plate; 21, through groove; 22, screening cylinder; 23, movable frame; 24, movable rod; 25, screening motor; 26, turntable; 27, spring seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] Embodiment 1: Please refer to Figures 1-4 , a screening mechanism for a combine harvester for grains, including a screening cylinder 22 and a feeding port 1. A feeding port 1 is arranged on the left side of the top end of the screening cylinder 22. A baffle motor 3 is fixedly connected to the outer wall of the feeding port 1. The output shaft of the baffle motor 3 is fixedly connected to a rotating baffle 2. The rotating baffle 2 is located inside the feeding port 1. The right side of the bottom end of the feeding port 1 communicates with a pneumatic separation channel 4. The pneumatic separation channel 4 is located at the top end of the inner wall of the screening cylinder 22. A baffle 5 is fixedly connected to the bottom end of the pneumatic separation channel 4. A negative pressure fan 6 is fixedly connected to the right side of the pneumatic separation channel 4. The output end of the negative pressure fan 6 is fixedly connected to a dust exhaust pipe 7. The negative pressure fan 6 is communicated to a treatment box 8 through the dust exhaust pipe 7. The screening cylinder 22 is a frame body composed of three arc-shaped plates. The right side of the bottom end of the feeding port 1 is open;

[0025] Specifically, as shown in Figure 1 and Figure 4 , when the threshed grains enter the feeding port 1, the rotating baffle 2 rotates to block the grains, ensuring continuous and uniform conveyance of the materials. At the same time, the negative pressure fan 6 forms a negative pressure suction environment in the pneumatic separation channel 4. When the grains fall from the lower right of the feeding port 1 onto the first sieve plate 18, the lighter grain husks and dust are lifted due to the height difference and directly enter the pneumatic separation channel 4, and are sucked into the treatment box 8 by the negative pressure fan 6 for centralized treatment.

[0026] Embodiment 2: A spray head 10 is fixedly connected to one side of the top end of the inner wall of the treatment box 8. A water pump 9 is fixedly connected to the outer wall of the treatment box 8. A water tank 12 is installed at the bottom end of the treatment box 8. A suction pipe 11 is connected between the water pump 9 and the water tank 12. The output end of the water pump 9 is connected to the spray head 10;

[0027] Specifically, as shown in Figure 1 and Figure 4 , the water pump 9 pumps out the spray water in the water tank 12 through the suction pipe 11 and evenly sprays it into the treatment box 8 through the spray head 10. The pneumatic separation materials such as dust and unthreshed husks entering the treatment box 8 are sprayed by the water mist, which can make the uncompletely threshed husks settle due to the moisture and increase their weight, so as to be more effectively separated from the grain system.

[0028] Embodiment 3: A screening motor 25 is fixedly connected to the outer wall of the screening cylinder 22. The output shaft of the screening motor 25 is fixedly connected to an eccentric position of the turntable 26. An activity frame 23 is movably sleeved outside the turntable 26. A set of activity rods 24 are welded on each of the left and right sides of the activity frame 23. The bottom ends of the activity rods 24 are fixedly connected to a first sieve plate 18. A second sieve plate 17 is arranged below the first sieve plate 18. Spring seats 27 are respectively installed on the left sides of the first sieve plate 18 and the second sieve plate 17 and the left inner wall of the screening cylinder 22. A connecting rod 19 is fixedly connected between the first sieve plate 18 and the second sieve plate 17. Two groups of connecting rods 19 are provided and are respectively obliquely supported at both ends of the first sieve plate 18 and the second sieve plate 17. A shaft sleeve is welded on the inner wall of the screening cylinder 22. The activity rods 24 move left and right within the shaft sleeve. Channel grooves 16 are arranged on the right sides of both the first sieve plate 18 and the second sieve plate 17. The channel grooves 16 are respectively fixedly connected within the screening cylinder 22. Discharge pipes 15 are respectively arranged on the right sides of the channel grooves 16. The discharge pipes 15 are respectively connected to a first material box 13 and a second material box 14 at the bottom end of the screening cylinder 22. A through groove 21 is opened at the bottom end of the screening cylinder 22. A slag plate 20 is arranged below the through groove 21. The slag plate 20 is obliquely arranged;

[0029] Specifically, as Figure 1 , Figure 2 and Figure 3 shown, when the screening motor 25 drives the turntable 26 to rotate, it drives the activity frame 23 to continuously move left and right reciprocally, and then drives the first sieve plate 18 to form a high-speed reciprocating screening through the activity rods 24. The grains that do not pass through the pores of the first sieve plate 18 enter the discharge pipe 15 from the channel groove 16 and are introduced into the first material box 13, while the grains that pass through the pores of the second sieve plate 17 enter the second material box 14. Finally, the screened particles fall from the through groove 21 onto the slag plate 20 and are discharged.

[0030] Working principle: When the threshed grains enter the feeding port 1, the rotating baffle 2 rotates to block the grains, ensuring the continuous and uniform conveying of the materials. At the same time, the negative pressure fan 6 creates a negative pressure suction environment in the air separation channel 4. When the grains fall from the lower right of the feeding port 1 onto the first sieve plate 18, the lighter grain husks and dust are lifted due to the height difference and directly enter the air separation channel 4, and are sucked into the treatment box 8 by the negative pressure fan 6 for centralized treatment. The water pump 9 pumps out the spray water in the water tank 12 through the suction pipe 11 and evenly sprays it into the treatment box 8 through the spray head 10. The air separation substances such as dust and unthreshed husks that enter the treatment box 8 are sprayed with water mist, which can make the unthreshed husks settle due to the moisture and increase their weight, so as to be more effectively separated from the grain system. When the screening motor 25 drives the turntable 26 to rotate, it drives the movable frame 23 to continuously move left and right reciprocally, and then drives the first sieve plate 18 to form a high-speed reciprocating screening through the movable rod 24. The grains that do not pass through the pores of the first sieve plate 18 enter the discharge pipe 15 from the chute 16 and are introduced into the first material box 13, while the grains that pass through the pores of the second sieve plate 17 enter the second material box 14. The finally screened particles fall from the through groove 21 onto the slag plate 20 and are discharged. During the screening process, the spring seat 27 reduces the vibration impact between the first sieve plate 18 and the second sieve plate 17, effectively protecting the sieve plates from being damaged, and is especially suitable for long-term operation.

[0031] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to encompass all changes within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A screening mechanism for a combine harvester, comprising a screening cylinder (22) and a feed inlet (1), characterized in that: On the left side of the top end of the screening cylinder (22), a feeding port (1) is provided. The outer wall of the feeding port (1) is fixedly connected with a baffle motor (3). The output shaft of the baffle motor (3) is fixedly connected with a rotating baffle (2). The rotating baffle (2) is located inside the feeding port (1). On the right side of the bottom end of the feeding port (1), a pneumatic separation channel (4) is communicated. The pneumatic separation channel (4) is located at the top end of the inner wall of the screening cylinder (22). The bottom end of the pneumatic separation channel (4) is fixedly connected with a baffle (5). On the right side of the pneumatic separation channel (4), a negative pressure fan (6) is fixedly connected. The output end of the negative pressure fan (6) is fixedly connected with a dust exhaust pipe (7). The negative pressure fan (6) is communicated to a treatment box (8) through the dust exhaust pipe (7).

2. The screening mechanism of a combined grain harvester according to claim 1, characterized in that: The screening cylinder (22) is a frame body composed of three arc-shaped plates, and the right side of the bottom end of the feeding port (1) is open.

3. The screening mechanism of a combined grain harvester according to claim 1, characterized in that: The outer wall of the screening cylinder (22) is fixedly connected with a screening motor (25). The output shaft of the screening motor (25) is fixedly connected to an eccentric position of a turntable (26). An activity frame (23) is movably sleeved outside the turntable (26). A set of activity rods (24) are welded on each of the left and right sides of the activity frame (23). The bottom ends of the activity rods (24) are fixedly connected with a first sieve plate (18). A second sieve plate (17) is arranged below the first sieve plate (18). Spring seats (27) are respectively installed on the left sides of the first sieve plate (18) and the second sieve plate (17) and the left inner wall of the screening cylinder (22).

4. The screening mechanism of a combine harvester according to claim 3, characterized in that: A connecting rod (19) is fixedly connected between the first sieve plate (18) and the second sieve plate (17). There are two sets of the connecting rods (19), which are respectively obliquely supported at both ends of the first sieve plate (18) and the second sieve plate (17).

5. A screening mechanism for a combine harvester according to claim 1, characterized in that: A shaft sleeve is welded on the inner wall of the screening cylinder (22), and the activity rod (24) moves left and right in the shaft sleeve.

6. The screening mechanism of a combine harvester for grains according to claim 1, wherein: On one side of the top end of the inner wall of the treatment box (8), a spray head (10) is fixedly connected. The outer wall of the treatment box (8) is fixedly connected with a water pump (9). A water tank (12) is installed at the bottom end of the treatment box (8). A suction pipe (11) is connected between the water pump (9) and the water tank (12). The output end of the water pump (9) is connected to the spray head (10).

7. The screening mechanism of a combine harvester according to claim 3, characterized in that: Chute channels (16) are respectively arranged on the right sides of the first sieve plate (18) and the second sieve plate (17). The chute channels (16) are respectively fixedly connected inside the screening cylinder (22). Discharge pipes (15) are respectively arranged on the right sides of the chute channels (16). The discharge pipes (15) are respectively connected into a first material box (13) and a second material box (14) at the bottom end of the screening cylinder (22).

8. The screening mechanism of a combined grain harvester according to claim 1, characterized in that: A through slot (21) is opened at the bottom end of the screening cylinder (22). A slag plate (20) is arranged below the through slot (21), and the slag plate (20) is inclined.

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