A threshing cylinder of a combine harvester for grains

Abstract

The present invention relates to a threshing cylinder of a combine harvester for grains, which comprises a spiral feeding head, a threshing cylinder barrel and a secondary impact threshing mechanism inside the barrel; the spiral feeding head comprises a large feeding spiral blade, a small feeding spiral blade and a conical cylinder; the threshing cylinder barrel comprises a cylinder shaft, a spoke plate, a cylinder frame and threshing spike teeth; the secondary impact threshing mechanism inside the barrel comprises an axial sleeve, a connecting rod, a rasp bar and a spring. The spiral feeding head is welded to the front end of the threshing cylinder barrel, and the secondary impact threshing mechanism is installed inside the threshing cylinder barrel, and the three are coaxial. The feeding device of the present invention is firm and has a good feeding effect; the secondary impact threshing mechanism increases the moment of inertia of the threshing cylinder, maintains the stability of the cylinder rotation speed, and reduces the energy loss during the threshing process; the secondary impact threshing mechanism further improves the threshing rate.

Description

Technical Field

[0001] The present invention belongs to the field of agricultural machinery and equipment, and specifically relates to a threshing cylinder of a grain combine harvester for threshing and separating grains. Technical Background

[0002] Most of the feeding spiral blades on the existing conical cylinders are two pieces, and the feeding is uneven, resulting in crops staying at the connection between the cross bridge and the threshing chamber, and the feeding effect is poor; the spiral blades of the feeding part of the existing vertical axial flow threshing cylinder are directly welded to its base conical cylinder. When the cylinder rotates at a high speed or with a large feeding amount, the feeding spiral blades are subjected to greater force and are easily broken, and the shutdown for maintenance affects the work efficiency; the existing threshing cylinders consume a large amount of energy during the threshing process, and only rely on the threshing spike teeth at the edge of the cylinder to thresh the grains, so that the grains cannot be subjected to secondary threshing treatment after entering the threshing cylinder body. For details, refer to a vertical axial flow grain combine harvester threshing cylinder disclosed in Patent CN212413898U. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a threshing cylinder of a grain combine harvester, which improves the feeding efficiency, reduces the energy loss during threshing, and improves the threshing effect of crops in the threshing chamber, thereby improving the work efficiency.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A threshing cylinder of a grain combine harvester includes a spiral feeding head, a threshing cylinder body, a cylinder shaft and a secondary impact threshing mechanism; the spiral feeding head is welded to the front end of the threshing cylinder body, and the secondary impact threshing mechanism is installed inside the threshing cylinder body; the secondary impact threshing mechanism includes a first impact threshing mechanism and a second impact threshing mechanism; the first impact threshing mechanism and the second impact threshing mechanism are connected by at least two stripper bars, the first impact threshing mechanism is installed at one end of the cylinder shaft, and the second impact threshing mechanism is installed at the other end of the cylinder shaft; the first impact threshing mechanism and the second impact threshing mechanism have the same structure, and each includes two axial sleeves, multiple connecting rods and several springs; wherein, both of the two axial sleeves are sleeved on the cylinder shaft, and the outer circles of the two axial sleeves are connected by several springs, and each axial sleeve is hinged to the ends of multiple stripper bars through multiple connecting rods; the first and third axial sleeves close to the spiral feeding head are fixed on the cylinder shaft, and the second and fourth axial sleeves close to the spiral feeding head can slide axially on the cylinder shaft. In the present invention, by adding a secondary impact threshing mechanism inside the threshing cylinder body, when the secondary impact threshing mechanism works, the vertical distance between the center of mass of the threshing mechanism and the cylinder shaft increases, the moment of inertia increases, the cylinder speed is more stable, and the energy loss during threshing is reduced; the secondary impact threshing mechanism performs secondary impact threshing on the grains entering the cylinder, and the threshing rate is improved.

[0006] Further, the spiral feeding head includes a large feeding spiral blade, a small feeding spiral blade and a conical cylinder, and is characterized in that the large feeding spiral blade and the small feeding spiral blade are respectively welded on the conical cylinder, presenting a double - spiral structure.

[0007] Further, to avoid the feeding spiral blades being broken due to large forces when rotating at high speed or with a large feeding volume, the feeding head being blocked, and the feeding of the feeding head being uneven. Most of the existing feeding spiral blades are two pieces, so in the present invention, the large feeding spiral blade is improved to be two pieces and the small feeding spiral blade is improved to be two pieces, and the two are evenly distributed on the conical cylinder.

[0008] Further, the threshing drum cylinder body includes a drum shaft, a flange plate, a drum frame and threshing teeth. The drum shaft is connected to the flange plate by welding, the flange plate is connected to the drum frame by welding, and a number of threshing teeth are arranged on the drum frame; the threshing teeth are connected to the drum frame by welding; along the movement direction of the crop in the threshing chamber, the rasp bars move in the direction away from the drum shaft, and the threshing drum cylinder body is cylindrical; the threshing drum is inclinedly installed.

[0009] Further, the installation angles of the threshing teeth are different.

[0010] Further, the secondary impact threshing mechanism inside the cylinder includes an axial sleeve, a connecting rod, a rasp bar and a spring; the axial sleeve is installed on the drum shaft, the axial sleeve is connected to the connecting rod by bolts, the connecting rod is connected to the rasp bar by bolts, and two adjacent axial sleeves are connected by a spring. In the static state, the spring is in a natural elongation state. During the high - speed rotation of the drum, under the action of centrifugal force, the rasp bar extends out, the spring is compressed, the distance between the axial sleeves becomes shorter, and the grain entering the drum is subjected to secondary impact threshing. A total of three sets of connecting rods and rasp bars are evenly installed around the drum shaft.

[0011] The beneficial effects of the present invention are as follows:

[0012] In the present invention, by adding a secondary impact threshing mechanism inside the threshing drum cylinder body, when the secondary impact threshing mechanism works, the vertical distance between the centroid of the threshing mechanism and the drum shaft increases, the moment of inertia increases, the drum speed is more stable, and the energy loss during threshing is reduced; in the present invention, the grain is first threshed by the threshing teeth on the threshing drum cylinder body, and then the grain entering the threshing drum is subjected to secondary impact threshing by the secondary impact threshing mechanism. Through the combination of internal and external structures, the threshing rate of the grain is improved; further, in the present invention, by designing that the large feeding spiral blade and the small feeding spiral blade are evenly distributed on the conical cylinder, when the drum rotates at high speed or with a large feeding volume, the feeding spiral blades are evenly stressed, durable, and have a good feeding effect; and by installing the threshing drum inclinedly, the threshing time is increased and the threshing is more thorough. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the present invention;

[0014] Figure 2 is a partially enlarged view of the spiral feeding head of the present invention;

[0015] Figure 3 is a schematic structural diagram of the threshing spike teeth of the present invention;

[0016] Figure 4 is a schematic structural diagram of the spring stretching state of the secondary impact threshing mechanism of the present invention;

[0017] Figure 5 is a schematic structural diagram of the spring compression state of the secondary impact threshing mechanism of the present invention;

[0018] Figure 6 is a partially enlarged view of the axial sleeve part of the secondary impact threshing mechanism of the present invention;

[0019] In the attached drawings, the components represented by each reference numeral are as follows: 1. Spiral feeding head, 2. Threshing drum cylinder, 3. First impact threshing mechanism, 4. Second impact threshing mechanism, 5. Large feeding spiral blade, 6. Small feeding spiral blade, 7. Conical cylinder, 8. Drum shaft, 9. Amplitude disc, 10. Drum frame, 11. Threshing spike teeth, 12. Ribbed bar, 13. Axial sleeve, 14. Connecting rod, 15. Spring. Detailed Description of the Invention

[0020] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the present invention otherwise clearly indicates, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof;

[0022] For the convenience of narration, if the words "upper", "lower", "left", and "right" appear in the present invention, they only indicate the same direction as the upper, lower, left, and right of the attached drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0023] Such asFigure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown in Figure 5 , this embodiment discloses a threshing cylinder of a combine harvester for grains, which includes a spiral feeding head 1, a threshing cylinder barrel 2, a cylinder shaft 8, and a secondary impact threshing mechanism. The spiral feeding head 1 is welded to the front end of the threshing cylinder barrel 2, and the secondary impact threshing mechanism is installed inside the threshing cylinder barrel 2. In the present invention, by adding a secondary impact threshing mechanism inside the threshing cylinder barrel 2, when the secondary impact threshing mechanism works, the vertical distance between the centroid of the threshing mechanism and the cylinder shaft 8 increases, the moment of inertia increases, the cylinder speed is more stable, and the energy loss during threshing is reduced. The secondary impact threshing mechanism performs secondary impact threshing on the grains entering the cylinder, improving the threshing rate.

[0024] As Figure 2 shown, the spiral feeding head 1 includes a feeding spiral large blade 5, a feeding spiral small blade 6, and a conical cylinder 7. The feeding spiral large blade 5 and the feeding spiral small blade 6 are welded to the conical cylinder 7. Among them, the feeding spiral large blade 5 includes two pieces, and the feeding spiral small blade 6 includes two pieces. The two feeding spiral large blades 5 and the two feeding spiral small blades 6 are evenly distributed on the conical cylinder 7. The starting height of the feeding spiral large blade 5 and the feeding spiral small blade 6 is not zero. The crops are forced to be fed under the rotational action of the feeding spiral large blade 5 at the front end of the threshing cylinder. The feeding spiral small blade 6 quickly thins the crop layer and feeds it into the threshing cylinder barrel 2 to prevent blockage. It should be noted that the size of the feeding spiral large blade 5 in this embodiment is larger than that of the feeding spiral small blade 6.

[0025] As Figure 1 , Figure 3 shown, the threshing cylinder barrel 2 includes a cylinder shaft 8, a flange disc 9, a cylinder frame 10, and threshing spike teeth 11. The cylinder shaft 8 is connected to the flange disc 9 by welding, and the flange disc 9 is connected to the cylinder frame 10 by welding. Along the movement direction of the crops in the threshing chamber, the rasp bars 12 move in a direction away from the cylinder shaft 8. A number of threshing spike teeth 11 are connected to the cylinder frame 10 by welding. And the installation angles of the threshing spike teeth 11 are different, and the threshing efficiency can be improved by the threshing spike teeth 11 with different angles.

[0026] Furthermore, the above-mentioned cylinder frame 10 includes multiple long rods arranged along the direction parallel to the axis of the cylinder shaft 8, and the long rods are welded to the above-mentioned flange disc 9 to form a hollow frame.

[0027] Furthermore, as Figure 4As shown in the figure, the secondary impact threshing mechanism includes two parts, namely the first impact threshing mechanism 3 and the second impact threshing mechanism 4. The first impact threshing mechanism 3 and the second impact threshing mechanism 4 are connected by three rasp bars 12. The first impact threshing mechanism 3 is installed at one end of the drum shaft 8, and the second impact threshing mechanism 4 is installed at the other end of the drum shaft 8.

[0028] Furthermore, the first impact threshing mechanism 3 and the second impact threshing mechanism 4 in this embodiment have the same structure, each including two axial sleeves 13, three rasp bars 12, six connecting rods 14, and several springs 15. Among them, the two axial sleeves 13 are both sleeved on the drum shaft 8, and the outer circles of the two axial sleeves 13 are connected by several springs 15. One of the axial sleeves 13 is fixed, and the other axial sleeve 13 can slide along the drum shaft 8 under the action of an external force. Each axial sleeve 13 is connected to the ends of the three rasp bars 12 by six connecting rods 14. Two connecting rods 14 are in a group, and a group of connecting rods 14 connects one rasp bar 12. The three groups of connecting rods 14 are evenly arranged along the circumferential direction of the axial sleeve 13. In the secondary impact threshing mechanism, there are a total of 4 axial sleeves 13. Starting from the position of the spiral feeding head 1, the first axial sleeve 13 and the third axial sleeve 13 are fixed on the drum shaft 8, and the second axial sleeve 13 and the fourth axial sleeve 13 can slide axially on the drum shaft 8. The four axial sleeves 13 are coaxial.

[0029] Of course, it is not difficult to understand that in other embodiments, the number of the rasp bars 12 can also be designed as two, four, etc., and the effect is the same as that of the three rasp bars 12 in this embodiment. When the rasp bars 12 are designed with other quantities, the number of the connecting rods 14 also increases accordingly.

[0030] The working principle of the present invention is as follows:

[0031] The spiral feeding head 1 smoothly feeds the crops conveyed by the cross bridge into the threshing drum cylinder 2 for threshing. The grains entering the drum can be struck by the secondary impact threshing mechanism for re-threshing. In the static state, the spring 15 is in a stretched state, the distance between two adjacent axial sleeves 13 is relatively far, and the rasp bar 12 is close to the drum shaft 8. In the state of the high-speed movement of the threshing drum, the rasp bar 12 moves outward under the action of centrifugal force, away from the drum shaft 8, the distance between two adjacent axial sleeves 13 becomes shorter, and the spring 15 is in the extreme compression state. The grain particles and impurities in the threshed materials enter the cleaning system, and the straws and weeds are discharged at the tail of the threshing drum.

[0032] The present invention first threshes the grains through the threshing spike teeth on the threshing drum cylinder, and then threshes the grains entering the threshing drum by the secondary impact threshing mechanism. Through the combination of the internal and external structures, the threshing rate of the grains is improved.

[0033] Such asFigure 4 , Figure 5 As shown in Figure 5 , the secondary impact threshing mechanism in the present invention is installed on the drum shaft. There are a total of 4 axial sleeves 13. The first and third axial sleeves 13 close to the spiral feeding head 1 are fixed on the drum shaft 8. The second and fourth axial sleeves 13 close to the spiral feeding head 1 can slide axially on the drum shaft 8. The axial sleeve 13 is connected to the connecting rod 14 by bolts. The connecting rod 14 is connected to the rasp bar 12 by bolts. The spring 15 is connected to the axial sleeve 13 by welding. A total of three sets of the connecting rod 14 and the rasp bar 12 are evenly installed around the drum shaft 8.

[0034] In the present invention, by adding a secondary impact threshing mechanism inside the threshing drum cylinder, when the secondary impact threshing mechanism works, the vertical distance between the centroid of the secondary impact threshing mechanism and the drum shaft increases, resulting in an increase in the moment of inertia, making the drum speed more stable and reducing the energy loss during the threshing process. Moreover, the secondary impact threshing mechanism performs secondary impact threshing on the grains entering the drum, improving the threshing rate. At the same time, the present invention also designs the large feeding spiral blades and the small feeding spiral blades to be evenly distributed on the conical cylinder. When the drum rotates at a high speed or during large feeding, the feeding spiral blades are evenly stressed, durable, and have a good feeding effect. And by installing the threshing drum obliquely, the threshing time is increased and the threshing is more sufficient. That is, on the one hand, the present invention adds a secondary impact threshing mechanism inside the threshing drum cylinder, and on the other hand, it also redesigns the structure of the spiral feeding head. Through the combined action of the two, together with the oblique installation of the threshing drum, finally the threshing drum threshes more sufficiently.

[0035] The above is only the specific implementation manner of the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the scope and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A threshing cylinder of a combine harvester, characterized in that, It includes a spiral feeding head, a threshing drum cylinder, a drum shaft and a secondary impact threshing mechanism; the spiral feeding head is welded to the front end of the threshing drum cylinder, and the secondary impact threshing mechanism is installed inside the threshing drum cylinder; the secondary impact threshing mechanism includes a first impact threshing mechanism and a second impact threshing mechanism; the first impact threshing mechanism and the second impact threshing mechanism are connected by at least two rasp bars, the first impact threshing mechanism is installed at one end of the drum shaft, and the second impact threshing mechanism is installed at the other end of the drum shaft; the first impact threshing mechanism and the second impact threshing mechanism have the same structure, each including two axial sleeves, multiple connecting rods, and several springs; wherein, both of the two axial sleeves are sleeved on the drum shaft, and the outer circles of the two axial sleeves are connected by several springs, and each axial sleeve is hinged to the ends of multiple rasp bars through multiple connecting rods; the first and third axial sleeves close to the spiral feeding head are fixed on the drum shaft, and the second and fourth axial sleeves close to the spiral feeding head can slide axially on the drum shaft.

2. A threshing cylinder of a combine harvester according to claim 1, wherein, The spiral feeding head includes a feeding spiral large blade, a feeding spiral small blade and a conical cylinder; the feeding spiral large blade and the feeding spiral small blade are respectively welded on the conical cylinder, presenting a double spiral structure.

3. A threshing cylinder of a combine harvester according to claim 2, wherein, There are two feeding spiral large blades, and there are two feeding spiral small blades. The two feeding spiral large blades and the two feeding spiral small blades are evenly distributed on the conical cylinder.

4. A threshing cylinder of a combine harvester according to claim 1, wherein, The threshing drum cylinder includes a drum shaft, a rim plate, a drum frame and threshing teeth; the drum shaft is connected to the rim plate, the rim plate is connected to the drum frame, and several threshing teeth are arranged and connected on the drum frame.

5. A threshing cylinder of a combined grain harvester according to claim 4, wherein, The installation angles of the threshing teeth are different.

6. The threshing cylinder of a combine harvester as claimed in claim 1, wherein, The threshing drum is installed obliquely.

7. A threshing cylinder of a combine harvester according to claim 1, characterized in that, The rasp bars are evenly installed around the drum shaft.

8. A threshing cylinder of a combine harvester as claimed in claim 1, wherein, In the static state, the spring is in a natural elongation state. During the high-speed rotation of the drum, under the action of centrifugal force, the rasp bars move in a direction away from the drum shaft, the spring is compressed, and the distance between the axial sleeves becomes shorter, so as to perform secondary impact threshing on the grains entering the drum.

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