Threshing cylinder with adjustable threshing tooth bending degree and unchanged cylinder outer diameter and adjusting method

Abstract

The invention discloses a threshing cylinder with adjustable threshing tooth camber and unchanged cylinder outer diameter and an adjusting method, the threshing cylinder comprises a cylinder body, threshing teeth on the cylinder body comprise bottom threshing teeth, top threshing teeth and threshing tooth sleeves, the threshing tooth sleeves are vertically arranged on a fixed rod in a penetrating manner, the bottom threshing teeth are slidably sleeved in the threshing tooth sleeves, and the top threshing teeth are sleeved in the top threshing teeth. The bottom ends of the top threshing teeth are rotatably hinged to the top ends of the bottom threshing teeth through pin shafts, threshing tooth bending adjusting mechanisms and threshing tooth length adjusting mechanisms are arranged on the fixing rods, and the threshing tooth bending adjusting mechanisms are connected with the top threshing teeth and control the top threshing teeth to rotate around the pin shafts so as to adjust the bending of the threshing teeth. The threshing tooth length adjusting mechanism is connected with the bottom threshing teeth and controls the bottom threshing teeth to ascend and descend so as to adjust the length of the threshing teeth, and the outer diameter of the roller can be kept unchanged after the bending degree of the threshing teeth changes. When the method is used for adjusting, machine halt and machine disassembly are not needed in the whole process, and the method has the advantages of being wide in adaptability, high in adjusting efficiency, low in cost, capable of achieving multiple purposes through one machine and the like.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, and in particular to a threshing drum with adjustable threshing tooth curvature and constant drum outer diameter and an adjustment method thereof. Background Art

[0002] The elbow rod teeth are made by bending the top of the rod teeth at a certain angle. The rod teeth have the characteristics of strong threshing ability, and the bent part at the top can reduce the impact of the threshing teeth on the materials, while reducing the breakage rate and loss rate. However, when threshing crops with different characteristic parameters and types, the bending angle of the top of the elbow rod teeth is not the same, and the current methods for adjusting the angle of the elbow rod teeth are: (1) replacing elbow rod teeth with different inclination angles; (2) designing an elbow rod tooth angle adjustment device. Among them, the problem with method (1) is that it leads to high production costs of the machine, and replacing the elbow rod teeth is time-consuming and labor-intensive; the problem with method (2) is that when the angle of the elbow rod teeth changes, the outer diameter of the drum also changes. Therefore, there is currently no existing technology that can adjust the inclination angle of the elbow rod teeth while ensuring that the outer diameter of the drum remains unchanged. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a threshing drum with adjustable curvature of threshing teeth and unchanged outer diameter of the drum and an adjustment method thereof, which can adjust the curvature of the threshing teeth efficiently and at low cost while ensuring that the outer diameter of the drum remains unchanged, thereby better reducing the breakage rate and loss rate of the harvester.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: The invention discloses a threshing drum with adjustable threshing tooth curvature and unchanged outer diameter of the drum, comprising a drum body, the drum body comprising a plurality of fixed rods and threshing teeth arranged on the fixed rods, the threshing teeth comprising a bottom threshing tooth, a top threshing tooth and a threshing tooth sleeve, the threshing tooth sleeve vertically penetrates and is fixedly mounted on the fixed rod, the bottom threshing tooth is slidingly sleeved in the threshing tooth sleeve and both ends extend out of the threshing tooth sleeve, the bottom end of the top threshing tooth is rotatably hinged to the top end of the bottom threshing tooth through a pin shaft, each fixed rod is provided with a threshing tooth curvature adjustment mechanism and a threshing tooth length adjustment mechanism, the threshing tooth curvature adjustment mechanism is connected with the top threshing tooth to control the top threshing tooth to rotate around the pin shaft to adjust the curvature of the threshing tooth, the threshing tooth length adjustment mechanism is connected with the bottom threshing tooth to control the lifting and lowering of the bottom threshing tooth to adjust the length of the threshing tooth, so that the outer diameter of the drum can remain unchanged after the curvature of the threshing tooth changes.

[0005] As a further improvement of the above technical solution: The threshing tooth curvature adjustment mechanism includes a group of top electric cylinders and a group of top connecting components. The cylinder body of the top electric cylinder is installed on the outside of the fixed rod and close to the first threshing tooth by bolts. The top electric cylinder push rod of the top electric cylinder is inclined toward the outside. One end of the top connecting component is hinged to the end of the top electric cylinder push rod, and the other end is hinged to the top of all the top threshing teeth on the same fixed rod. When the top electric cylinder push rod is extended or retracted, all the top threshing teeth are driven to rotate synchronously around the pin shaft through the top connecting component.

[0006] The threshing tooth length adjustment mechanism comprises a group of bottom electric cylinders and a group of bottom connecting components. The cylinder body of the bottom electric cylinder is fixedly mounted on the outer end of the fixing rod close to the top electric cylinder and is located on the inner side thereof by bolts. The bottom electric cylinder push rod of the bottom electric cylinder extends inwardly and the end portion is fixedly connected to one end of the bottom connecting component. The other end of the bottom connecting component is fixedly connected to the bottom ends of all the bottom threshing teeth on the same fixing rod. When the bottom electric cylinder push rod is extended or retracted, all the bottom threshing teeth are driven to rise and fall synchronously through the bottom connecting component.

[0007] The top connecting assembly includes a push-pull rod located outside the fixed rod and parallel to the fixed rod and a plurality of connecting rods corresponding to the top threshing teeth one by one. Through holes are provided at both ends of the connecting rod. One end can be rotatably mounted on the push-pull rod, and the other end can be rotatably hinged to the top end of the corresponding top threshing tooth through a hinge shaft. The top electric cylinder push rod is vertically facing the push-pull rod and the end portion can be rotatably mounted on the push-pull rod.

[0008] The push-pull rod is sleeved with a plurality of open retaining rings, and one end of the connecting rod connected to the push-pull rod and one end of the top electric cylinder push rod connected to the push-pull rod are both axially limited by the retaining rings.

[0009] The bottom connecting assembly includes a connecting plate located on the inner side of the fixing rod and parallel to the fixing rod, the bottom end of the bottom threshing tooth is fixedly connected to the connecting plate, the bottom electric cylinder push rod is vertically oriented toward the connecting plate and the end is fixedly connected to the connecting plate, and the telescopic direction is parallel to the lifting direction of the bottom threshing tooth.

[0010] The bottom threshing teeth and the top threshing teeth are both cylindrical, a through groove running transversely therethrough is provided in the middle of the top end of the bottom threshing teeth, a flat connecting portion is provided at the bottom end of the top threshing teeth, the connecting portion is embedded in the through groove and hinged through the pin shaft; a groove is provided on one side of the top end of the top threshing teeth, the end of the connecting rod is embedded in the groove and hinged through the hinge shaft.

[0011] The threshing gear sleeve is a circular sleeve. When the bottom threshing gear slides in the threshing gear sleeve, it is limited by two groups of limiting components. Each group of limiting components includes longitudinal grooves on opposite sides of the threshing gear sleeve and limiting shafts installed on opposite sides of the bottom threshing tooth and extending laterally. The limiting shafts pass through the corresponding longitudinal grooves. The two groups of longitudinal grooves are respectively arranged at both ends of the threshing gear sleeve and are staggered at 90 degrees.

[0012] The top end of the threshing gear sleeve is provided with two open avoidance grooves corresponding to the pin shaft on the bottom threshing gear.

[0013] A method for adjusting the threshing drum as described above comprises the following steps: 1) Adjustment of the curvature of the threshing teeth: The top electric cylinder controls the extension and retraction of the top electric cylinder push rod, drives the push-pull rod to drive the top threshing teeth connected to it to rotate around the pin shaft, change its inclination angle, and change the curvature of the threshing teeth; 2) Adjustment of the outer diameter of the drum: When the curvature of the threshing teeth changes, the distance from the top of the top threshing teeth to the fixed rod changes, and the bottom electric cylinder controls the extension and retraction of the bottom electric cylinder push rod, driving the connecting plate to drive the bottom threshing teeth connected to it to move in the threshing gear sleeve, ensuring that the outer diameter of the threshing drum remains unchanged.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The threshing drum of the present invention divides the threshing teeth into two parts, the upper and lower parts. The top threshing teeth are controlled to have an inclination angle by a threshing teeth curvature adjustment mechanism, and the bottom threshing teeth are controlled to rise and fall by a threshing teeth length adjustment mechanism to control the total length of the threshing teeth. Thus, the curvature of the threshing teeth can be adjusted in real time while ensuring that the outer diameter of the drum remains unchanged, so that the curvature of the threshing teeth is maintained within an optimal range to adapt to the threshing operation of crops of different characteristics and types, meet the actual needs of "one machine for multiple uses", and effectively reduce the breakage rate and loss rate.

[0015] 2. The threshing drum of the present invention can also automatically change the curvature of the threshing teeth while ensuring that the outer diameter of the drum remains unchanged, without the need to stop or disassemble the machine during the entire process, which can further improve the adjustment efficiency and reduce the overall production and use costs.

[0016] 3. The adjustment method of the present invention also has the above advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the threshing drum of the present invention.

[0018] Figure 2 Schematic diagram of the assembly three-dimensional structure of the threshing teeth and the threshing teeth curvature and length adjustment mechanism in the present invention Figure 1 .

[0019] Figure 3Schematic diagram of the assembly three-dimensional structure of the threshing teeth and the threshing teeth curvature and length adjustment mechanism in the present invention Figure 2 .

[0020] Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at point A in the middle.

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the threshing gear sleeve in the present invention.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure in which the top threshing teeth and the bottom threshing teeth are hinged in the present invention.

[0023] In the figure: 1. Drum body; 2. Fixing rod; 3. Connecting plate; 4. Bottom electric cylinder push rod; 5. Bottom electric cylinder; 6. Bolt; 7. Threshing gear sleeve; 8. Pin shaft; 9. Bottom threshing teeth; 10. Top threshing teeth; 11. Connecting rod; 12. Push-pull rod; 13. Retaining ring; 14. Top electric cylinder; 15. Top electric cylinder push rod; 16. Limiting shaft; 17. Longitudinal groove; 18. Opening avoidance groove. DETAILED DESCRIPTION

[0024] The invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1-Figure 6As shown, an embodiment of a threshing drum with adjustable threshing tooth curvature and unchanged outer diameter of the drum of the present invention comprises a drum body 1, the drum body 1 comprises a plurality of fixed rods 2 and threshing teeth arranged on the fixed rods 2, the threshing teeth comprise a bottom threshing tooth 9, a top threshing tooth 10 and a threshing tooth sleeve 7, the threshing tooth sleeve 7 vertically penetrates and is fixedly mounted on the fixed rod 2, the bottom threshing tooth 9 is slidably sleeved in the threshing tooth sleeve 7 and both ends extend out of the threshing tooth sleeve 7, the bottom end of the top threshing tooth 10 is rotatably hinged to the top end of the bottom threshing tooth 9 through a pin 8, each fixed rod 2 is provided with a threshing tooth curvature adjustment mechanism and a threshing tooth length adjustment mechanism, the threshing tooth curvature adjustment mechanism is connected to the top threshing tooth 10, and is used to control the top threshing tooth 10 to rotate around the pin 8 to adjust the curvature of the threshing tooth, and the threshing tooth length adjustment mechanism is connected to the bottom threshing tooth 9, and is used to control the lifting and lowering of the bottom threshing tooth 9 to adjust the length of the threshing tooth, so that the outer diameter of the drum can remain unchanged after the curvature of the threshing tooth changes. The present invention divides the threshing teeth into two parts, an upper part and an lower part. The top threshing teeth are controlled to have an inclination angle through a threshing teeth curvature adjustment mechanism, and the bottom threshing teeth are controlled to rise and fall through a threshing teeth length adjustment mechanism to control the total length of the threshing teeth, thereby achieving real-time adjustment of the curvature of the threshing teeth while ensuring that the outer diameter of the drum remains unchanged, so that the curvature of the threshing teeth is maintained within an optimal range, and the threshing operation of crops of different characteristics and types can be adapted. The curvature of the threshing teeth can also be automatically changed while ensuring that the outer diameter of the drum remains unchanged, without the need to stop or disassemble the machine during the entire process, thereby improving the adjustment efficiency, reducing the overall production and use costs, meeting the actual needs of "one machine for multiple uses", and effectively reducing the breakage rate and loss rate.

[0026] In this embodiment, the threshing tooth curvature adjustment mechanism includes a group of top electric cylinders 14 and a group of top connecting components. The cylinder body of the top electric cylinder 14 is installed on the outside of the fixed rod 2 (that is, the outside of the drum body) and close to the first threshing tooth through bolts 6. The top electric cylinder push rod 15 of the top electric cylinder 14 is tilted toward the outside. One end of the top connecting component is hinged to the end of the top electric cylinder push rod 15, and the other end is hinged to the top of all the top threshing teeth 10 on the same fixed rod 2. When the top electric cylinder push rod 15 is extended or retracted, all the top threshing teeth 10 are driven to rotate synchronously around the pin 8 through the top connecting component.

[0027] In this embodiment, the threshing tooth length adjustment mechanism includes a group of bottom electric cylinders 5 and a group of bottom connecting components. The cylinder body of the bottom electric cylinder 5 is fixedly mounted on the outer end of the fixed rod 2 close to the top electric cylinder 14 and is located on the inner side thereof (i.e., the inner side of the drum body) by bolts 6. The bottom electric cylinder push rod 4 of the bottom electric cylinder 5 extends inwardly and the end is fixedly connected to one end of the bottom connecting component. The other end of the bottom connecting component is fixedly connected to the bottom ends of all the bottom threshing teeth 9 on the same fixed rod 2. When the bottom electric cylinder push rod 4 is extended or retracted, all the bottom threshing teeth 9 are driven to rise and fall synchronously through the bottom connecting component.

[0028] In this embodiment, the top connecting assembly includes a push-pull rod 12 located on the outside of the fixed rod 2 and parallel to it, and a plurality of connecting rods 11 corresponding to the top threshing teeth 10 one by one. Through holes are provided at both ends of the connecting rod 11. One end can be rotatably mounted on the push-pull rod 12, and the other end can be rotatably hinged to the top end of the corresponding top threshing tooth 10 through a hinge shaft. The top electric cylinder push rod 15 is vertically facing the push-pull rod 12 and the end thereof can be rotatably mounted on the push-pull rod 12.

[0029] In this embodiment, a plurality of open retaining rings 13 are sleeved on the push-pull rod 12 , and one end of the connecting rod 11 connected to the push-pull rod 12 and one end of the top electric cylinder push rod 15 connected to the push-pull rod 12 are both axially limited by the retaining rings 13 .

[0030] In this embodiment, the bottom connecting assembly includes a connecting plate 3 located on the inner side of the fixed rod 2 and parallel to it, the bottom end of the bottom threshing tooth 9 is fixedly connected to the connecting plate 3, the bottom electric cylinder push rod 4 is vertically facing the connecting plate 3 and the end is fixedly connected to it, and the telescopic direction is parallel to the lifting direction of the bottom threshing tooth 9.

[0031] In this embodiment, the bottom threshing tooth 9 and the top threshing tooth 10 are both cylindrical, a horizontally penetrating through groove is provided in the middle of the top end of the bottom threshing tooth 9, and a flat-plate-shaped connecting portion is provided at the bottom end of the top threshing tooth 10, which is embedded in the through groove and hinged by a pin 8; a groove is provided on one side of the top end of the top threshing tooth 10, and the end of the connecting rod 11 is embedded in the groove and hinged by a hinge shaft.

[0032] In this embodiment, the threshing gear sleeve 7 is a circular sleeve, and the bottom threshing gear 9 is limited by two sets of limit assemblies when sliding in the threshing gear sleeve 7. Each set of limit assemblies includes longitudinal grooves 17 provided on opposite sides of the threshing gear sleeve 7 and limit shafts 16 installed on opposite sides of the bottom threshing gear 9 and extending laterally. The limit shafts 16 pass through the corresponding longitudinal grooves 17. The two sets of longitudinal grooves 17 are provided at both ends of the threshing gear sleeve 7 and are staggered at 90 degrees. Two open avoidance grooves 18 are provided at the top of the threshing gear sleeve 7 corresponding to the pin 8 on the bottom threshing tooth 9.

[0033] The adjustment method of the threshing drum of the present embodiment comprises the following steps: 1) Adjustment of the curvature of the threshing teeth: The top electric cylinder 14 controls the extension and retraction of the top electric cylinder push rod 15, drives the push-pull rod 12 to drive the top threshing teeth 10 connected thereto to rotate around the pin shaft 8, changes its inclination angle, and changes the curvature of the threshing teeth; 2) Adjustment of the outer diameter of the drum: After the curvature of the threshing teeth changes, the distance from the top of the top threshing teeth 10 to the fixed rod 2 changes, and the bottom electric cylinder 5 controls the extension and retraction of the bottom electric cylinder push rod 4, driving the connecting plate 3 to drive the bottom threshing teeth 9 connected thereto to move in the threshing gear sleeve 7, ensuring that the outer diameter of the threshing drum remains unchanged.

[0034] The specific method is: When the curvature of the threshing teeth needs to be increased, the top electric cylinder 14 controls the top electric cylinder push rod 15 to extend, driving the push-pull rod 12 away from the fixed rod 2, and then driving the top threshing teeth 10 to rotate downward around the pin axis, thereby increasing the curvature of the threshing teeth. In this process, the distance from the top threshing teeth 10 to the fixed rod 2 will be shortened, so it is necessary to make the bottom threshing teeth 9 rise to increase the total length of the threshing teeth. To this end, the bottom electric cylinder 5 controls the bottom electric cylinder push rod 4 to contract, so that the connecting plate 3 drives the bottom threshing teeth 9 connected thereto to rise, thereby achieving that when the curvature of the threshing teeth increases, the outer diameter of the threshing drum does not change.

[0035] Similarly, when the curvature of the threshing teeth needs to be reduced, the top electric cylinder 14 controls the top electric cylinder push rod 15 to retract, driving the push-pull rod 12 to approach the fixed rod 2, and then pushing the top threshing teeth 10 to rotate upward around the pin axis, thereby reducing the curvature of the threshing teeth. In this process, the distance between the top threshing teeth 10 and the fixed rod 2 will increase, so it is necessary to lower the bottom threshing teeth 9 to reduce the total length of the threshing teeth. To this end, the bottom electric cylinder 5 controls the bottom electric cylinder push rod 4 to extend, so that the connecting plate 3 drives the bottom threshing teeth 9 connected thereto to descend, thereby achieving that when the curvature of the threshing teeth is reduced, the outer diameter of the threshing drum does not change.

[0036] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Improvements and changes obtained without departing from the technical concept of the present invention, such as: 1) installing a mechanism for detecting parameters such as torque, force, feed amount, material humidity, etc. on the threshing drum, and automatically adjusting the inclination angle of the top threshing teeth before threshing or during threshing by detecting the corresponding parameters; 2) using other mechanical structures such as ratchets, in principle, the inclination angle of the top threshing teeth can be changed and the bottom threshing teeth can be raised and lowered; 3) by other means, when adjusting the inclination angle of the top threshing teeth, the length of the top threshing teeth can be changed; 4) by changing the position of the fixed rod to ensure that the outer diameter of the threshing drum does not change, etc., should also be regarded as the protection scope of the present invention.

Claims

1. A threshing drum with adjustable threshing tooth curvature and a constant outer diameter of the drum, comprising a drum body (1), wherein the drum body (1) comprises a plurality of fixing rods (2) and threshing teeth arranged on the fixing rods (2), characterized in that: The threshing teeth comprise a bottom threshing tooth (9), a top threshing tooth (10) and a threshing tooth sleeve (7). The threshing tooth sleeve (7) vertically penetrates and is fixedly mounted on the fixed rod (2). The bottom threshing tooth (9) is slidably sleeved in the threshing tooth sleeve (7) and both ends extend out of the threshing tooth sleeve (7). The bottom end of the top threshing tooth (10) is rotatably hinged to the top end of the bottom threshing tooth (9) via a pin shaft (8). Each fixed rod (2) is provided with a threshing tooth curvature adjustment mechanism and a threshing tooth length adjustment mechanism. The threshing tooth curvature adjustment mechanism is connected to the top threshing tooth (10) to control the top threshing tooth (10) to rotate around the pin shaft (8) to adjust the curvature of the threshing tooth. The threshing tooth length adjustment mechanism is connected to the bottom threshing tooth (9) to control the bottom threshing tooth (9) to rise and fall to adjust the length of the threshing tooth, so that the outer diameter of the drum can remain unchanged after the curvature of the threshing tooth changes.

2. The threshing drum according to claim 1, characterized in that: The threshing tooth curvature adjustment mechanism comprises a group of top electric cylinders (14) and a group of top connecting components. The cylinder body of the top electric cylinder (14) is installed on the outside of the fixed rod (2) and close to the first threshing tooth by means of bolts (6). The top electric cylinder push rod (15) of the top electric cylinder (14) is inclined toward the outside. One end of the top connecting component is hinged to the end of the top electric cylinder push rod (15), and the other end is hinged to the top of all the top threshing teeth (10) on the same fixed rod (2). When the top electric cylinder push rod (15) is extended or retracted, all the top threshing teeth (10) are driven to rotate synchronously around the pin shaft (8) through the top connecting component.

3. The threshing drum according to claim 2, characterized in that: The threshing tooth length adjustment mechanism comprises a group of bottom electric cylinders (5) and a group of bottom connecting components. The cylinder body of the bottom electric cylinder (5) is fixedly mounted on the outer end of the fixing rod (2) close to the top electric cylinder (14) and located on the inner side thereof by means of bolts (6). The bottom electric cylinder push rod (4) of the bottom electric cylinder (5) extends inwardly and the end thereof is fixedly connected to one end of the bottom connecting component. The other end of the bottom connecting component is fixedly connected to the bottom ends of all the bottom threshing teeth (9) on the same fixing rod (2). When the bottom electric cylinder push rod (4) is extended or retracted, all the bottom threshing teeth (9) are driven to rise and fall synchronously through the bottom connecting component.

4. The threshing drum according to claim 2, characterized in that: The top connection assembly comprises a push-pull rod (12) located outside the fixed rod (2) and parallel thereto, and a plurality of connecting rods (11) corresponding one to one with the top threshing teeth (10). Through holes are provided at both ends of the connecting rod (11). One end is rotatably mounted on the push-pull rod (12), and the other end is rotatably hinged to the top end of the corresponding top threshing tooth (10) via a hinge shaft. The top electric cylinder push rod (15) is vertically oriented toward the push-pull rod (12), and the end portion is rotatably mounted on the push-pull rod (12).

5. The threshing drum according to claim 4, characterized in that: A plurality of open retaining rings (13) are sleeved on the push-pull rod (12), and one end of the connecting rod (11) connected to the push-pull rod (12) and one end of the top electric cylinder push rod (15) connected to the push-pull rod (12) are both axially limited by the retaining rings (13).

6. The threshing drum according to claim 3, characterized in that: The bottom connection assembly comprises a connection plate (3) located on the inner side of the fixing rod (2) and parallel to the fixing rod (2), the bottom end of the bottom threshing tooth (9) is fixedly connected to the connection plate (3), the bottom electric cylinder push rod (4) is vertically oriented toward the connection plate (3) and the end is fixedly connected to the connection plate (3), and the telescopic direction is parallel to the lifting direction of the bottom threshing tooth (9).

7. The threshing drum according to claim 5, characterized in that: The bottom threshing teeth (9) and the top threshing teeth (10) are both cylindrical, a through groove running transversely therethrough is provided in the middle of the top end of the bottom threshing teeth (9), a flat plate-shaped connecting portion is provided at the bottom end of the top threshing teeth (10), the connecting portion is embedded in the through groove and is hinged via the pin shaft (8); a groove is provided on one side of the top end of the top threshing teeth (10), the end of the connecting rod (11) is embedded in the groove and is hinged via the hinge shaft.

8. The threshing drum according to any one of claims 1 to 7, characterized in that: The threshing gear sleeve (7) is a circular sleeve. When the bottom threshing gear (9) slides in the threshing gear sleeve (7), it is limited by two groups of limit assemblies. Each group of limit assemblies comprises longitudinal grooves (17) provided on opposite sides of the threshing gear sleeve (7) and limit shafts (16) installed on opposite sides of the bottom threshing gear (9) and extending transversely. The limit shafts (16) pass through the corresponding longitudinal grooves (17). The two groups of longitudinal grooves (17) are provided at both ends of the threshing gear sleeve (7) and are arranged in a staggered manner at 90 degrees.

9. The threshing drum according to claim 8, characterized in that: Two open avoidance grooves (18) are provided at the top end of the threshing tooth sleeve (7) corresponding to the pin shaft (8) on the bottom threshing tooth (9).

10. A method for adjusting a threshing drum as claimed in claim 6, characterized in that: The following steps are involved: 1) Adjustment of the curvature of the threshing teeth: the top electric cylinder (14) controls the top electric cylinder push rod (15) to extend and retract, driving the push-pull rod (12) to drive the top threshing teeth (10) connected thereto to rotate around the pin shaft (8), thereby changing the inclination angle thereof and changing the curvature of the threshing teeth; 2) Adjustment of the outer diameter of the drum: When the curvature of the threshing teeth changes, the distance from the top of the top threshing teeth (10) to the fixed rod (2) changes, and the bottom electric cylinder (5) controls the bottom electric cylinder push rod (4) to extend and retract, driving the connecting plate (3) to drive the bottom threshing teeth (9) connected thereto to move in the threshing gear sleeve (7), thereby ensuring that the outer diameter of the threshing drum remains unchanged.

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