A device for preventing clogging of concave screens in combine harvesters

Abstract

The present invention relates to an agricultural mechanical device, and in particular to a combined harvester concave screen anti-blocking device. A combined harvester concave screen anti-blocking device, the anti-blocking device comprises a raking mechanism, the raking mechanism comprises a raking rod, a connecting part I, a connecting part II, a transmission part and a supporting limit part I. The raking rod is a rod-shaped member, located between a threshing drum and a concave screen, one end of which is connected and fixed with the transmission part through the connecting part I, and the other end is connected and fixed with the supporting limit part I through the connecting part II; the transmission part is installed at one end of the threshing drum main shaft of the combined harvester, and drives the raking rod to rotate between the threshing drum and the concave screen under the action of the threshing drum main shaft; the supporting limit part I is installed and fixed at the other end of the threshing drum main shaft of the combined harvester, and is used to support the limited raking mechanism. The present invention has the following advantages: 1. It solves the clumping and blocking problem that occurs when harvesting after rain or fog; 2. It improves productivity; 3. It has a simple structure.

Description

Technical Field

[0001] The invention relates to an agricultural mechanical device, in particular to a concave plate screen anti-blocking device for a combine harvester. Background Art

[0002] my country is a large agricultural country. During the rice harvest season, there are always rainy and foggy days in different regions. Harvesting such high-humidity rice in rainy and foggy days will cause the threshing and cleaning devices of harvesters and combine harvesters to be blocked. Especially during the threshing process, once the rice stalks and rice grains stick together to form a mass, the concave screen will be blocked, and the threshed rice grains will not fall from the sieve holes of the concave screen, but will be discharged together with the rice straw, causing a lot of waste. Chinese patent [CN110946002A] discloses a threshing method and threshing device of a combine harvester and its application. The patent can only achieve a cleaning effect on the sieve holes of the concave screen, but cannot solve the problem of blockage between the concave screen and the threshing drum during the threshing process. Chinese patent [CN111165188A] discloses a high-throughput threshing and cleaning device. Although the device can meet the high-throughput cleaning requirements, it also cannot solve the problem of blockage caused by the rice stalks and rice grains sticking together to form a mass. Summary of the invention

[0003] The purpose of the present invention is to provide a combine harvester concave screen anti-blocking device which can solve the problem of blockage between the concave screen and the threshing drum during the threshing process when the combine harvester harvests high-humidity rice in rainy and foggy days.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a device for preventing blocking of a concave plate screen of a combine harvester, the device comprising a harrowing mechanism, the harrowing mechanism comprising a harrowing rod, a connecting part I, a connecting part II, a transmission part and a supporting and limiting part I, the harrowing rod is a rod-shaped member, located between a threshing drum and a concave plate screen, one end of which is connected and fixed to the transmission part through the connecting part I, and the other end is connected and fixed to the supporting and limiting part I through the connecting part II; the transmission part is installed at one end of the main shaft of the threshing drum of the combine harvester, and drives the harrowing rod to rotate in the gap between the threshing drum and the concave plate screen under the action of the main shaft of the threshing drum; the supporting and limiting part I is installed and fixed at the other end of the main shaft of the threshing drum of the combine harvester, and is used to support the limiting harrowing mechanism.

[0005] Preferably, the connection part I and the connection part II are respectively vertically connected to the harrow bar.

[0006] Furthermore, the raking mechanism also includes a supporting and limiting part II for supporting and limiting the raking mechanism, and the supporting and limiting part II includes a fixed wheel and a support rod. The fixed wheel is fixedly connected to the threshing device frame of the combine harvester, and a circumferential slide groove is arranged along its circumference; one end of the support rod is fixed to the connecting part I, and the other end can slide circumferentially in the circumferential slide groove.

[0007] Preferably, the transmission part includes a large gear and a small gear, the large gear is meshed with the small gear, the outer ring of the large gear is connected and fixed to the connecting part I, and the small gear is fixed on the main shaft of the threshing drum.

[0008] Preferably, the transmission ratio between the large gear and the small gear is 1.2:1 to 3:1.

[0009] Preferably, the support and limiting part I is a rolling bearing, the inner ring of which is fixed on the main shaft of the threshing drum, and the outer ring of which is fixed to the connecting part II.

[0010] Preferably, the inner ring of the rolling bearing and the main shaft of the threshing drum are fixed by interference fit.

[0011] Preferably, the grain-raking rod comprises three parallel long rods and an arc-shaped connecting plate, and the two ends of the three parallel long rods are respectively fixed to the connecting part I and the connecting part II through the arc-shaped connecting plate; the cross-section of the grain-raking rod is an arc-shaped one concentric with the concave plate screen.

[0012] Preferably, a plurality of long strip-shaped wire brushes are fixed in a vertical direction to the bottom surfaces of the three parallel long rods.

[0013] The outer dimensions of the harrowing bar fit the inner surface of the concave screen, and it can make free circular motion around the main axis of the threshing drum in the gap between the threshing drum and the concave screen. When the harrowing bar moves between the threshing drum and the concave screen, the three parallel long rods and wire brushes on it will break up the rice stalks and grains that are piled up in clusters, and at the same time clean the sieve holes of the concave screen, thereby improving the screening efficiency of the concave screen and effectively preventing the concave screen from being blocked when the combine harvester harvests high-humidity rice. The fixed wheel, support rod and rolling bearing are installed at the left and right ends of the harrowing mechanism and are located between the threshing device frame and the threshing drum, playing the role of supporting and limiting the harrowing mechanism, thereby ensuring the smooth and reliable meshing of the large and small gears and effectively transmitting power.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. It solves the problem of blockage between the concave screen and the threshing drum during threshing when the combine harvester is harvesting in rainy and foggy days;

[0016] 2. It effectively reduces the waste and loss caused by wet straw carrying grains during threshing and cleaning, and improves productivity;

[0017] 3. Simple structure, easy to modify on the original machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of an embodiment of the present invention; wherein (a) is a left view; (b) is a front view;

[0019] Figure 2 2 is a schematic diagram of the structure of the harrowing mechanism in the embodiment of the present invention;

[0020] Figure 3 is a front view of a fixed wheel in an embodiment of the present invention;

[0021] Figure 4 2 is a partial schematic diagram of a harrowing bar in an embodiment of the present invention;

[0022] Figure 5 2 is an application view of an embodiment of the present invention in a threshing device;

[0023] Figure 6 yes Figure 5 A front view of a threshing device cover;

[0024] Figure 7 It is the main view of the overall structure of the combine harvester;

[0025] Figure 8 is a side view of the overall structure of an embodiment of the present invention;

[0026] 1. Threshing device frame; 2. Concave plate screen; 3. Threshing drum; 4. Harrowing mechanism; 5. Threshing device cover; 6. Threshing drum main shaft; 7. Bolt hole; 8. Bolt; 9. Fixed wheel; 10. Support rod; 11. Feed inlet; 12. Outlet; 13. Small gear; 14. Large gear; 15. Harrowing rod; 16. Rolling bearing; 17. Bolt hole; 18. Circumferential slide; 19. Grass guide rib; 20. Bolt hole; 21. Wire brush; 22. Left connecting arm; 23. Right connecting arm. DETAILED DESCRIPTION

[0027] It should be noted that the directions or positional relationships indicated by terms such as “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] The following is combined with Figure 1-8 The present invention is further described in detail: a combined harvester concave screen anti-blocking device, comprising a fixed wheel 9, a support rod 10 and a harrowing mechanism 4; Figure 1-2 As shown, the raking mechanism 4 is composed of a small gear 13, a large gear 14, a raking rod 15, a left connecting arm 22, a right connecting arm 23 and a rolling bearing 16.

[0029] The specific structure of the harrowing mechanism 4 is as follows: Figure 2As shown, the pinion 13 is fixed circumferentially and axially to the left end of the threshing drum main shaft 6, the large gear 14 is meshed with the pinion 13, the outer ring of the large gear 14 is welded to the upper end of the left connecting arm 22 (i.e., connecting part I), the lower end of the left connecting arm 22 is welded to the left end of the harrowing rod 15, and the left connecting arm 22 is perpendicular to the harrowing rod 15; the inner ring of the rolling bearing 16 is fixed to the right end of the threshing drum main shaft 6 by interference fit, the upper end of the right connecting arm 23 (i.e., connecting part II) is welded to the outer ring of the rolling bearing 16, and the lower end is welded to the right end of the harrowing rod 15, and the right connecting arm 23 is perpendicular to the harrowing rod 15; the radial direction of the large gear 14, the pinion 13 and the rolling bearing 16 is perpendicular to the axial direction of the harrowing rod 15. As shown Figure 4 As shown, the main frame of the grain-raking rod 15 is composed of three parallel long rods and an arc-shaped connecting plate. The two ends of the three parallel long rods are respectively connected and fixed to the left connecting arm 22 and the right connecting arm through the arc-shaped connecting plate. The cross-section of the grain-raking rod is an arc concentric with the concave plate screen 2. A number of long steel wire brushes 21 are welded on the lower surface of the main frame in a direction perpendicular to the three parallel long rods. The outer dimensions of the grain-raking rod should be able to ensure that it fits the inner surface of the concave plate screen 2, and can make free circular motion around the main axis 6 of the threshing drum in the gap between the threshing drum 3 and the concave plate screen 2, so that the grain-raking rod has a better clearing effect and moves more smoothly.

[0030] like Figure 3 As shown, the fixed wheel 9 is provided with a plurality of bolt holes 17 and a circumferential slide groove 18 along its circumference, and is fixedly connected to the threshing device frame 1 through bolts 8 and bolt holes 17, and is close to the left end of the harrowing rod 15; one end of the support rod 10 is fixed to the left connecting arm 22, and is perpendicular to the left connecting arm 22, and the other end is inserted into the circumferential groove 18, and it can slide circumferentially in the circumferential slide groove 18.

[0031] In order to simplify the structure and facilitate installation, the power of the threshing drum main shaft 6 is transmitted to the harrowing mechanism 4 without adding a power source, but the harrowing mechanism 4 must also produce relative rolling between the concave plate screen 2 and the threshing drum 3. In addition, when harvesting rice in rainy and foggy days, the air humidity is different, the humidity of rice will also be different, the viscosity will also be different, and the blockage degree of the concave plate screen 2 will also be different. If you want to clear a serious blockage, the speed of the harrowing mechanism 4 needs to be increased, and the transmission ratio of the large and small gears needs to be reduced; conversely, if you want to clear a weak blockage, you can reduce the speed of the harrowing mechanism 4, that is, increase the transmission ratio of the large and small gears; therefore, the transmission ratio between the large gear and the small gear is 1.2:1 to 3:1.

[0032] The anti-blocking device of the present invention is used in a combine harvester, comprising a threshing device frame 1, a concave plate screen 2, a threshing drum 3, a harrowing mechanism 4 and a threshing device cover 5; Figure 5-8As shown, the concave plate screen 2 is fixed on the threshing device frame 1 and is close to its lower part; the threshing drum 3 is installed on the threshing device frame 1 through the threshing drum main shaft 6; both ends of the threshing drum main shaft 6 pass through the threshing device frame 1 and are connected to the external power device fixedly connected to the threshing device frame 1 through the bolt holes 7, and the threshing drum 3 is driven to rotate under the action of the external power device; a certain gap is reserved between the concave plate screen 2 and the threshing drum 3, and the raking bar of the raking mechanism 4 is located in the gap between the threshing drum 3 and the concave plate screen 2 and performs a circular motion around the threshing drum main shaft 6; the threshing device cover 5 serves as the cover plate of the threshing device, and a plurality of bolt holes 20 are opened on it. The threshing device cover 5 is fixed to the threshing device frame 1 by bolts adapted to the bolt holes 20, and grass guide ribs 19 are arranged on the inner surface of the threshing device cover 5; the threshing drum 3 rotates around the threshing drum main shaft 6 between the threshing device cover 5 and the concave plate screen 2.

[0033] Working principle: Rice enters the threshing and cleaning device from the feed port 11. While the threshing drum 3 is rotating at high speed, the small gear 13 fixedly mounted on the main shaft 6 of the threshing drum drives the large gear 14 to rotate, and the large gear 14 drives the left connecting arm 22 welded to its outer circumference to rotate. At the same time, the support rod 10 fixedly connected to the left connecting arm 22 moves in the track of the circumferential slide groove 18 of the fixed wheel 9, supporting and limiting the movement trajectory of the left connecting arm 22, so that the rake bar 15 performs a circular motion rotating around the main shaft 6 of the threshing drum. When the circular rake bar 15 moves between the threshing drum and the concave screen, the three parallel long rods and the wire brush 21 on it break up the rice stalks and grains that are piled up in clusters, and at the same time clean the sieve holes of the concave screen, thereby improving the screening efficiency of the concave screen and effectively preventing the concave screen from being blocked when the combine harvester harvests high-humidity rice. Finally, the rice stalks are discharged from the outlet 12. Since the rotation speed of the raking mechanism 4 does not need to be synchronized with the rotation speed of the threshing drum, the transmission ratio between the large gear 14 and the small gear 13 is set between 1.2:1 and 3:1, and the right connecting arm 23 is connected to the threshing drum main shaft 6 by a rolling bearing 16. The fixed wheel 9, the support rod 10 and the rolling bearing 16 form a set, which plays a supporting and limiting role for the raking mechanism 4, thereby ensuring the stable and reliable meshing of the large and small gears and effectively transmitting power. The rolling bearing 16 mainly plays the role of supporting one end of the right connecting arm 23 of the raking mechanism. When the raking mechanism 4 rotates, due to the influence of the centrifugal force of the circular motion and the gravity of the mechanism itself, if the left connecting arm 22 of the raking mechanism is not supported, it is likely that the large and small gears will be misplaced and the meshing will be inaccurate, thereby affecting the transmission of power.

[0034] The above disclosure is only the preferred embodiment of the present invention and is not intended to limit the present invention. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. A device for preventing concave screen from blocking a combine harvester, characterized in that: The anti-blocking device comprises a raking mechanism, which comprises a raking rod, a connecting part I, a connecting part II, a transmission part and a supporting and limiting part I. The raking rod is a rod-shaped member, which is located between the threshing drum and the concave screen, one end of which is connected and fixed to the transmission part through the connecting part I, and the other end is connected and fixed to the supporting and limiting part I through the connecting part II; the transmission part is installed at one end of the main shaft of the threshing drum of the combine harvester, and drives the raking rod to rotate between the gap between the threshing drum and the concave screen under the action of the main shaft of the threshing drum; the supporting and limiting part I is installed and fixed at the other end of the main shaft of the threshing drum of the combine harvester, and is used to support the limiting raking mechanism; The connecting part I and the connecting part II are respectively connected vertically with the rake bar; the transmission part includes a large gear and a small gear, the large gear meshes with the small gear, the outer ring of the large gear is connected and fixed with the connecting part I, and the small gear is fixed on the main shaft of the threshing drum; the supporting limit part I is a rolling bearing, the inner ring of which is fixed on the main shaft of the threshing drum, and the outer ring of which is fixed with the connecting part II; The rake bar includes three parallel long bars and an arc-shaped connecting plate. The two ends of the three parallel long bars are respectively fixed to the connecting part I and the connecting part II through the arc-shaped connecting plate. The cross section of the rake bar is an arc concentric with the concave plate screen. A plurality of long steel wire brushes are fixed in the vertical direction of the bottom surface of the three parallel long bars. The harrowing mechanism also includes a supporting and limiting part II for supporting and limiting the harrowing mechanism. The supporting and limiting part II includes a fixed wheel and a support rod. The fixed wheel is fixedly connected to the threshing device frame of the combine harvester, and a circumferential slide groove is arranged along its circumference; one end of the support rod is fixed to the connecting part I, and the other end can slide circumferentially in the circumferential slide groove.

2. The anti-blocking device for the concave screen of a combine harvester according to claim 1, characterized in that: The transmission ratio between the large gear and the small gear is 1.2:1~3:

1.

3. The anti-blocking device for the concave screen of a combine harvester according to claim 1, characterized in that: The inner ring of the rolling bearing and the main shaft of the threshing drum are fixed by means of interference fit.

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