Header amplitude adjusting device and using method

Abstract

The invention discloses a header amplitude adjusting device and a using method. The header amplitude adjusting device comprises an amplitude adjusting support, a tensioning chain wheel base, a transition chain wheel assembly, a hinge piece, an upper cover plate and a lower cover plate. The tensioning chain wheel base is arranged on one side of the amplitude modulation support, the transition chain wheel assembly is arranged on the other side of the amplitude modulation support, the upper cover plate is fixedly arranged on a mounting assembly at one end of the lower cover plate, and the hinge piece penetrates through the upper cover plate, the lower cover plate, the transition chain wheel assembly and the amplitude modulation support. The upper cover plate and the lower cover plate are hinged to the transition chain wheel assembly and the amplitude modulation support respectively. A first chain is arranged between the transition chain wheel assembly and a chain wheel of the tensioning chain wheel base, and a second chain is arranged between the transition chain wheel assembly and a driving chain wheel at the other end of the lower cover plate and used for feeding crops with different ridge intervals into a stranding cage. The problem that when the cutting width is adjusted, the reel chain needs to be greatly tensioned and adjusted again, so that the efficiency is low is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of the header of a harvester, and particularly relates to an amplitude modulation device for a header and a using method thereof. Background Art

[0002] The statements in this part merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] In the header part of the current corn combine harvester, most of them adopt a fixed arrangement of the reel chains and a fixed cutting width type, and can only harvest at fixed row numbers and row spacings, with great limitations. This makes the corn harvester unable to adapt to a larger adjustable range of the cutting width, and the corn harvesting process is more cumbersome and inefficient.

[0004] The prior art patent with the publication number of CN220274306U discloses a non-row-aligned corn header with an adjustable cutting width. The front ends of the reel chains located outside the ear picking units on both sides are respectively installed on the ear picking brackets through reel sprocket assemblies and adjusting screw rod assemblies, and are used to manually adjust the screw rod assemblies to adjust the inclination angle of the front ends of the reel chains. Since the reel chain is composed of a single chain, when changing the size of the cutting width, the tension of the reel chain is greatly changed, and it is necessary to re-tighten the reel chain greatly through a long screw rod. Although it can solve the problem of unable to adjust the cutting width to a certain extent in the prior art, it still needs to first adjust the cutting width angle and then re-tighten the reel chain greatly. The adjustment process is cumbersome. Since the requirement for a special cutting width is temporary, the over-long adjustment time will lead to a significant reduction in work efficiency. Summary of the Invention

[0005] Aiming at the above problems, the present invention provides an amplitude modulation device for a header and a using method thereof, which divides the reel chain into two sections, solves the problem of low efficiency caused by the need to re-tighten the reel chain greatly when adjusting the cutting width; at the same time, by setting an arc-shaped adjustment groove and an arc-shaped positioning point, the adjustment of the cutting width size can be realized by loosening the slotted nut, and the positioning can be firmly carried out, further improving the adjustment efficiency of the cutting width of the header.

[0006] In order to achieve the above object, the present invention is realized by the following technical solutions:

[0007] In a first aspect, the present invention provides a header amplitude modulation device, which includes an amplitude modulation bracket, a tensioning sprocket seat, a transition sprocket assembly, a hinge member, an upper cover plate and a lower cover plate; the tensioning sprocket seat is arranged on one side of the amplitude modulation bracket, the transition sprocket assembly is arranged on the other side of the amplitude modulation bracket, the upper cover plate is fixedly arranged on the mounting assembly at one end of the lower cover plate, and the hinge member passes through the upper cover plate, the lower cover plate, the transition sprocket assembly and the amplitude modulation bracket, so that the upper cover plate and the lower cover plate are respectively hinged to the transition sprocket assembly and the amplitude modulation bracket; a first chain is arranged between the sprocket of the transition sprocket assembly and the sprocket of the tensioning sprocket seat, and a second chain is arranged between the transition sprocket assembly and the driving sprocket at the other end of the lower cover plate, for feeding crops with different row spacings into the auger.

[0008] The amplitude modulation bracket is composed of a tensioning chute, a tensioning seat and an amplitude modulation auxiliary plate; the tensioning chute is arranged on the amplitude modulation auxiliary plate, the tensioning seat is arranged above the tensioning chute, the transition sprocket assembly is arranged between the tensioning seat and the amplitude modulation auxiliary plate, and the rotation center of the amplitude modulation bracket is the same as the rotation center of the transition sprocket assembly, for adjusting the swing angle of the amplitude modulation bracket, and further realizing the adjustment of the header cutting width.

[0009] As a further implementation manner, the amplitude modulation auxiliary plate is arranged on the lower side of the lower cover plate, the amplitude modulation auxiliary plate is provided with an arc-shaped adjustment hole, and it is an arc with the hinge member as the center of the circle, the lower cover plate is provided with a fixing hole, and a positioning assembly is arranged in the fixing hole and the arc-shaped waist hole.

[0010] As a further implementation manner, the positioning assembly consists of a bolt and a slotted nut. The bolt is installed in the fixing hole and the arc-shaped adjustment hole. A flat gasket is also arranged between the lower side of the lower cover plate and the slotted nut. Positioning pin holes are arranged on both the slotted nut and the bolt, and an opening pin is installed in the positioning pin holes to prevent the slotted nut from falling off.

[0011] As a further implementation manner, a plurality of hemispherical positioning bumps are arranged on the lower cover plate, and a plurality of hemispherical positioning grooves are arranged on the lower side surface of the amplitude modulation auxiliary plate. The positioning bumps and the positioning grooves are arranged correspondingly, and are all arranged on an arc with the hinge member as the center of the circle; the positioning grooves are arranged between the hinge member and the arc-shaped adjustment groove.

[0012] As a further implementation manner, the transition sprocket assembly is composed of a transmission shaft, a driven sprocket and a driving sprocket; the driven sprocket is arranged at one end of the transmission shaft, the driving sprocket is arranged at the other end of the transmission shaft, and the transmission shaft is hinged to the amplitude modulation bracket through the hinge member, so that the driven sprocket and the driving sprocket can rotate relative to the amplitude modulation bracket, and further realize the transmission.

[0013] As a further implementation, a first grooving cutter is further provided on the lower cover plate. The first grooving cutter is located on one side of the driven wheel and is used to remove the sundries wound in the driven wheel, preventing the second chain from falling off the driven wheel.

[0014] As a further implementation, a second grooving cutter is provided on one side of the tensioning seat close to the driving sprocket, which is used to cooperate with the driving sprocket and remove the sundries on the driving sprocket.

[0015] As a further implementation, the tensioning sprocket seat is composed of a tensioning slide rail, a tensioning sprocket, a pull rod and a dividing tip; the tensioning slide rail is fixedly connected to the dividing tip, the tensioning sprocket is arranged in a hinged manner between the tensioning slide rail and the dividing tip, the tensioning slide rail is installed in the tensioning chute, a pull rod is arranged above the tensioning slide rail, a spring is arranged on the pull rod, and one end of the pull rod is installed on the tensioning seat and the spring is compressed by a nut.

[0016] As a further implementation, the first chain is installed between the driving sprocket and the tensioning sprocket.

[0017] In a second aspect, the present invention also provides a method for using a cutting table amplitude adjustment device, including the following steps:

[0018] S1. When it is necessary to adjust the cutting width of the cutting table to adapt to crops with different row spacings, first pull out the split pin, loosen the slotted nut, and manually rotate the amplitude adjustment bracket around the hinge member to drive the synchronous rotation of the transition sprocket assembly;

[0019] S2. When the amplitude adjustment bracket rotates to an appropriate angle, the positioning convex point on the lower cover plate is re-engaged with the positioning groove at the corresponding position on the amplitude adjustment auxiliary plate to initially fix the angle of the amplitude adjustment bracket. Then tighten the slotted nut and insert the split pin to complete the precise adjustment of the swing angle of the amplitude adjustment bracket, thereby realizing the adjustment of the cutting width of the cutting table;

[0020] S3. When the swing angle of the amplitude adjustment bracket is completed, by adjusting the pull rod and using the elastic force of the spring, drive the tensioning slide rail to move in the tensioning chute, so as to adjust the position of the tensioning sprocket and realize the tensioning of the first chain between the tensioning sprocket and the driving sprocket, ensuring the stability of the first chain drive.

[0021] Compared with the prior art, the advantages and positive effects of the present invention are:

[0022] The present invention divides the plowing chain into two sections, namely the first chain and the second chain, and controls the plowing chain through the first chain and the second chain, thereby effectively solving the problem of low efficiency caused by re-tightening and adjusting the plowing chain significantly when adjusting the cutting width, and reducing unnecessary adjustment steps and time consumption; the rotation center of the amplitude modulation bracket is the same as the rotation center of the transition sprocket assembly, which is used to adjust the swing angle of the amplitude modulation bracket, so that the cutting width adjustment operation is more accurate and flexible, and the appropriate cutting width can be quickly adjusted according to the actual crop ridge spacing.

[0023] The arc-shaped adjustment hole on the amplitude modulation auxiliary plate of the present invention takes the hinge as the center of the circle, cooperates with the fixing hole on the lower cover plate, and uses the positioning assembly to adjust and fix the angle of the amplitude modulation bracket. The amplitude modulation bracket can be manually rotated by loosening the slotted nut, and the bolt moves in the arc-shaped adjustment hole. After adjustment, the slotted nut is tightened and the cotter pin is inserted. Through the cooperation of the positioning pin hole, the angle of the amplitude modulation bracket is accurately and firmly fixed, ensuring the stability after the cutting width is adjusted, and avoiding the impact of the angle change on the harvesting operation; at the same time, the hemispherical positioning protrusion on the lower cover plate and the hemispherical positioning groove on the lower side of the amplitude modulation auxiliary plate are arranged on the arc with the hinge as the center of the circle. When the amplitude modulation bracket rotates to a suitable angle, the two automatically engage, and the angle of the amplitude modulation bracket can be initially fixed, providing a basis for subsequent precise fixation, reducing the fine-tuning time during the adjustment process, and further improving the efficiency of cutting width adjustment.

[0024] The driven sprocket and the driving sprocket of the present invention are arranged at both ends of the transmission shaft. The transmission shaft is hinged to the amplitude modulation bracket through a hinge and can rotate relative to the amplitude modulation bracket. During the cutting width adjustment process, the chain transmission function is not affected, ensuring that crops with different ridge spacings can be smoothly sent into the cage through the first chain and the second chain, thereby ensuring the normal progress of the harvesting operation; the first notching knife on the lower cover plate is located on one side of the driven wheel, and can remove debris entangled in the driven wheel to prevent the second chain from falling off the driven wheel; the second notching knife on the tensioning seat close to the driving sprocket side cooperates with the driving sprocket to remove debris on the driving sprocket, effectively reducing chain failures caused by debris, extending the service life of the chain, and ensuring the continuity and stability of the harvesting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 It is a schematic diagram of the overall structure of the header amplitude modulation device of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the amplitude modulation support of the present invention;

[0028] Figure 3Schematic structural diagram of the transition sprocket assembly of the present invention;

[0029] Figure 4 Schematic structural diagram of the lower cover plate of the present invention;

[0030] Figure 5 Schematic structural diagram of the tensioning sprocket seat of the present invention.

[0031] In the figure: 1. Amplitude adjustment bracket; 2. Tensioning sprocket seat; 3. Transition sprocket assembly; 4. Lower cover plate; 5. Upper cover plate; 6. Hinge; 7. Amplitude adjustment auxiliary plate; 8. Arc-shaped adjustment hole; 9. Tensioning chute; 10. Tensioning seat; 11. Second grooving tool; 12. Transmission shaft; 13. Driving sprocket; 14. Driven sprocket; 15. Installation assembly; 16. Positioning bump; 17. Fixing hole; 18. Tensioning slide rail; 19. Dividing point; 20. Tensioning sprocket; 21. Pull rod. Detailed implementation manners

[0032] It should be noted that the following detailed description is illustrative 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.

[0033] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the present invention clearly indicates otherwise, 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;

[0034] Although the problem of unable to adjust the cutting width can be solved to a certain extent in the prior art, it is still necessary to first adjust the cutting width angle and then greatly tighten the reel chain again. The adjustment process is cumbersome. Since the need for a special cutting width is temporary, the adjustment taking too long will lead to a significant reduction in work efficiency. The present invention is described according to the following content in combination with the accompanying drawings of the specification.

[0035] Embodiment 1

[0036] This embodiment provides a cutter bar amplitude adjustment device, as Figures 1 - 5As shown in the figure, it includes: an amplitude modulation bracket 1, a tensioning sprocket seat 2, a transition sprocket assembly 3, a hinge 6, an upper cover plate 5 and a lower cover plate 4; the tensioning sprocket seat 2 is arranged on one side of the amplitude modulation bracket 1, the transition sprocket assembly 3 is arranged on the other side of the amplitude modulation bracket 1, the upper cover plate 5 is fixedly arranged on the mounting assembly 15 at one end of the lower cover plate 4, and the hinge 6 passes through the upper cover plate 5, the lower cover plate 4, the transition sprocket assembly 3 and the amplitude modulation bracket 1, so that the upper cover plate 5 and the lower cover plate 4 are respectively hinged to the transition sprocket assembly 3 and the amplitude modulation bracket 1; a first chain is arranged between the sprocket of the transition sprocket assembly 3 and the sprocket of the tensioning sprocket seat 2, and a second chain is arranged between the transition sprocket assembly 3 and the driving sprocket at the other end of the lower cover plate 4, which is used to feed crops with different row spacings into the auger; by dividing the cutter bar bracket into two ends and controlling it through the two end chains, and dividing the reel chain into two sections, it effectively solves the problem of low efficiency caused by re-tightening the reel chain significantly when adjusting the cutting width, and reduces unnecessary adjustment steps and time consumption;

[0037] The amplitude modulation bracket 1 is composed of a tensioning chute 9, a tensioning seat 10 and an amplitude modulation auxiliary plate 7; the tensioning chute 9 is arranged on the amplitude modulation auxiliary plate 7, the tensioning seat 10 is arranged above the tensioning chute 9, the transition sprocket assembly 3 is arranged between the tensioning seat 10 and the amplitude modulation auxiliary plate 7, and the rotation centers of the amplitude modulation bracket 1 and the transition sprocket assembly 3 are the same, which is used to adjust the swing angle of the amplitude modulation bracket 1, making the cutting width adjustment operation more accurate and flexible, and can quickly adjust to the appropriate cutting width according to the actual row spacing of the crops.

[0038] As a further implementation method, the amplitude modulation auxiliary plate 7 is arranged on the lower side of the lower cover plate 4, an arc-shaped adjustment hole 8 is arranged on the amplitude modulation auxiliary plate 7, and it is an arc with the hinge 6 as the center of the circle. A fixing hole 17 is arranged on the lower cover plate 4, and a positioning component is arranged in the fixing hole 17 and the arc-shaped waist hole; the positioning component consists of a bolt and a slotted nut. The bolt is installed in the fixing hole 17 and the arc-shaped adjustment hole 8. A flat gasket is also arranged between the lower side of the lower cover plate 4 and the slotted nut. Positioning pin holes are arranged on both the slotted nut and the bolt, and a split pin is installed in the positioning pin holes to prevent the slotted nut from falling off; it realizes the precise and firm fixation of the angle of the amplitude modulation bracket 1, ensures the stability after the cutting width is adjusted, and avoids affecting the harvesting operation due to angle changes.

[0039] As a further implementation manner, a plurality of hemispherical positioning bumps 16 are arranged on the lower cover plate 4, and a plurality of hemispherical positioning grooves are arranged on the lower side surface of the amplitude modulation auxiliary plate 7. The positioning bumps 16 and the positioning grooves are arranged correspondingly and are all arranged on an arc with the hinge member 6 as the center of the circle; the positioning grooves are arranged between the hinge member 6 and the arc-shaped adjustment groove; when the amplitude modulation bracket 1 rotates to a suitable angle, the two automatically engage, which can preliminarily fix the angle of the amplitude modulation bracket 1, provide a basis for subsequent precise fixing, reduce the fine adjustment time during the adjustment process, and further improve the amplitude adjustment efficiency.

[0040] As a further implementation manner, the transition sprocket assembly 3 is composed of a transmission shaft 12, a driven sprocket 14 and a driving sprocket 13; the driven sprocket 14 is arranged at one end of the transmission shaft 12, the driving sprocket 13 is arranged at the other end of the transmission shaft 12, and the transmission shaft 12 is hinged to the amplitude modulation bracket 1 through the hinge member 6, so that the driven sprocket 14 and the driving sprocket 13 can rotate relative to the amplitude modulation bracket 1, thereby realizing transmission.

[0041] As a further implementation manner, a first grooving knife is further arranged on the lower cover plate 4, and the first grooving knife is located on one side of the driven wheel and is used for removing sundries wound in the driven wheel to prevent the second chain from falling off the driven wheel.

[0042] As a further implementation manner, a second grooving knife 11 is arranged on one side of the tensioning seat 10 close to the driving sprocket 13 and is used for cooperating with the driving sprocket 13 to remove sundries on the driving sprocket 13.

[0043] As a further implementation manner, the tensioning sprocket seat 2 is composed of a tensioning slide rail 18, a tensioning sprocket 20, a pull rod 21 and a dividing point 19; the tensioning slide rail 18 is fixedly connected with the dividing point 19, the tensioning sprocket 20 is hinged between the tensioning slide rail 18 and the dividing point 19, the tensioning slide rail 18 is installed in the tensioning chute 9, a pull rod 21 is arranged above the tensioning slide rail 18, a spring is arranged on the pull rod 21, and one end of the pull rod 21 is installed on the tensioning seat 10 and the spring is pressed tightly through a nut.

[0044] As a further implementation manner, a first chain is installed between the driving sprocket 13 and the tensioning sprocket 20.

[0045] Embodiment 2

[0046] This embodiment provides a method for using a header amplitude modulation device. In the initial state of the header amplitude modulation device, components such as the amplitude modulation support 1 and the lower cover plate 4 are connected by a hinge member 6, and the rotation centers of the amplitude modulation support 1 and the transition sprocket assembly 3 are the same. Initially, the bolt in the positioning component passes through the fixing hole 17 of the lower cover plate 4 and the arc-shaped adjustment hole 8 on the amplitude modulation auxiliary plate 7, and the split pin passes through the positioning pin hole of the slotted nut and the bolt to prevent the slotted nut from falling off. At the same time, the hemispherical positioning bump 16 on the lower cover plate 4 is correspondingly engaged with the hemispherical positioning groove on the lower side of the amplitude modulation auxiliary plate 7, so that the amplitude modulation support 1 is in a certain fixed angle. The specific usage method includes the following steps:

[0047] S1. When it is necessary to adjust the header cutting width to adapt to crops with different row spacings, first pull out the split pin, loosen the slotted nut, and manually rotate the amplitude modulation support 1 around the hinge member 6, driving the transition sprocket assembly 3 to rotate synchronously. Since the arc-shaped adjustment hole 8 on the amplitude modulation auxiliary plate 7 is an arc centered on the hinge member 6, the bolt can move in the arc-shaped adjustment hole 8 during the rotation process;

[0048] S2. When the amplitude modulation support 1 rotates to an appropriate angle, the positioning bump 16 on the lower cover plate 4 is re-engaged with the positioning groove at the corresponding position on the amplitude modulation auxiliary plate 7 to initially fix the angle of the amplitude modulation support 1. Then tighten the slotted nut and insert the split pin to complete the precise adjustment of the swing angle of the amplitude modulation support 1, thereby realizing the adjustment of the header cutting width;

[0049] S3. When the swing angle of the amplitude modulation support 1 is completed, by adjusting the pull rod 21, using the elastic force of the spring, drive the tensioning slide rail 18 to move in the tensioning chute 9, thereby adjusting the position of the tensioning sprocket 20 to achieve the tensioning of the first chain between the tensioning sprocket 20 and the driving sprocket 13, ensuring the stability of the first chain drive.

[0050] After adjusting the cutting width, the first chain between the driving sprocket 13 and the tensioning sprocket 20 and the second chain between the driven sprocket 14 and the driving sprocket at the other end of the lower cover plate 4 start to work, feeding crops with different row spacings into the auger. Among them, the driven sprocket 14 and the driving sprocket 13 of the transition sprocket assembly 3 are installed at both ends of the transmission shaft 12, and the transmission shaft 12 is hinged to the amplitude modulation support 1 through the hinge member 6 and can rotate relative to the amplitude modulation support 1 to realize chain drive. During the transmission process, the first cleaning groove knife on the lower cover plate 4 is on the side of the driven wheel, which can remove the sundries wound in the driven wheel to prevent the chain from falling off the driven wheel; the second cleaning groove knife 11 on the side of the tensioning seat 10 close to the driving sprocket 13 cooperates with the driving sprocket 13 to remove the sundries on the driving sprocket 13 to ensure the smoothness of the chain drive.

[0051] Although the specific implementation manners of the present invention have been described above in conjunction with the accompanying drawings, they do not limit the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts still fall within the protection scope of the present invention.

Claims

1. A header amplitude modulation device, characterized in that: It comprises an amplitude modulation bracket, a tensioning sprocket seat, a transition sprocket assembly, a hinge, an upper cover plate and a lower cover plate; the tensioning sprocket seat is arranged on one side of the amplitude modulation bracket, the transition sprocket assembly is arranged on the other side of the amplitude modulation bracket, the upper cover plate is fixedly arranged on the mounting assembly at one end of the lower cover plate, the hinge passes through the upper cover plate, the lower cover plate, the transition sprocket assembly and the amplitude modulation bracket, so that the upper cover plate and the lower cover plate are respectively hinged to the transition sprocket assembly and the amplitude modulation bracket; a first chain is arranged between the transition sprocket assembly and the sprocket of the tensioning sprocket seat, and a second chain is arranged between the transition sprocket assembly and the driving sprocket at the other end of the lower cover plate, which are used to feed crops with different ridge spacings into the cage; The amplitude modulation bracket is composed of a tensioning slide, a tensioning seat, and an amplitude modulation auxiliary plate; the tensioning slide is arranged on the amplitude modulation auxiliary plate, the tensioning seat is arranged above the tensioning slide, the transition sprocket assembly is arranged between the tensioning seat and the amplitude modulation auxiliary plate, and the rotation center of the amplitude modulation bracket is the same as the rotation center of the transition sprocket assembly, which is used to adjust the swing angle of the amplitude modulation bracket, thereby realizing the adjustment of the cutting width of the cutting table.

2. A header amplitude modulation device as claimed in claim 1, characterized in that: The amplitude modulation auxiliary plate is arranged on the lower side of the lower cover plate, and an arc-shaped adjustment hole is arranged on the amplitude modulation auxiliary plate, and the arc-shaped adjustment hole is arranged on the lower cover plate, and a fixing hole is arranged on the lower cover plate, and a positioning component is arranged in the fixing hole and the arc-shaped waist hole.

3. A header amplitude modulation device as claimed in claim 2, characterized in that: The positioning assembly consists of a bolt and a slotted nut, the bolt is installed in the fixing hole and the arc-shaped adjustment hole, a flat gasket is also arranged between the lower side of the lower cover plate and the slotted nut, and positioning pin holes are arranged on the slotted nut and the bolt, and a cotter pin is installed in the positioning pin hole to prevent the slotted nut from falling off.

4. A header amplitude modulation device as claimed in claim 2, characterized in that: The lower cover plate is provided with a plurality of hemispherical positioning protrusions, and the lower side surface of the amplitude modulation auxiliary plate is provided with a plurality of hemispherical positioning grooves. The positioning protrusions and the positioning grooves are arranged correspondingly and are both arranged on an arc with the hinge as the center; the positioning groove is arranged between the hinge and the arc-shaped adjustment groove.

5. A header amplitude modulation device as claimed in claim 1, characterized in that: The transition sprocket assembly consists of a transmission shaft, a driven sprocket and a driving sprocket; the driven sprocket is arranged at one end of the transmission shaft, and the driving sprocket is arranged at the other end of the transmission shaft. The transmission shaft is hinged to the amplitude modulation bracket through the hinge, so that the driven sprocket and the driving sprocket can rotate relative to the amplitude modulation bracket, thereby realizing transmission.

6. A header amplitude modulation device as claimed in claim 5, characterized in that: The lower cover plate is also provided with a first notching knife, which is located at one side of the driven wheel and is used to remove debris entangled in the driven wheel to prevent the second chain from falling off the driven wheel.

7. A header amplitude modulation device as claimed in claim 6, characterized in that: A second notching knife is arranged on one side of the tensioning seat close to the driving sprocket, which is used to cooperate with the driving sprocket and remove debris on the driving sprocket.

8. A header amplitude modulation device as claimed in claim 7, characterized in that: The tensioning sprocket seat is composed of a tensioning slide rail, a tensioning sprocket, a pull rod and a grain-dividing tip; the tensioning slide rail is fixedly connected to the grain-dividing tip, the tensioning sprocket is intersectingly arranged between the tensioning slide rail and the grain-dividing tip, the tensioning slide rail is installed in the tensioning slide groove, the pull rod is arranged above the tensioning slide rail, a spring is arranged on the pull rod, one end of the pull rod is installed on the tensioning seat, and the spring is tightened by a nut.

9. A header amplitude modulation device as claimed in claim 8, characterized in that: A first chain is installed between the driving sprocket and the tensioning sprocket.

10. A method for using a header amplitude modulation device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. When the cutting width of the header needs to be adjusted to adapt to crops with different ridge spacing, first pull out the cotter pin, loosen the slotted nut, and manually rotate the amplitude modulation bracket around the hinge to drive the transition sprocket assembly to rotate synchronously; S2. When the amplitude modulation bracket is rotated to a suitable angle, the positioning protrusion on the lower cover plate is re-engaged with the positioning groove at the corresponding position of the amplitude modulation auxiliary plate to initially fix the angle of the amplitude modulation bracket, and then the slotted nut is tightened and the cotter pin is inserted to complete the precise adjustment of the swing angle of the amplitude modulation bracket, thereby realizing the adjustment of the cutting width of the header; S3. When the swing angle of the amplitude modulation bracket is completed, the tensioning slide rail is driven to move in the tensioning slide groove by adjusting the pull rod and utilizing the elastic force of the spring, thereby adjusting the position of the tensioning sprocket to achieve tensioning of the first chain between the tensioning sprocket and the driving sprocket, thereby ensuring the stability of the first chain transmission.

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