Stem pulling structure and corn harvester

Abstract

The utility model belongs to the technical field of corn harvesters, and discloses a stem pulling structure and a corn harvester. The stem pulling structure comprises two stem pulling roller sets which are arranged in the first direction in a spaced mode, and each stem pulling roller set comprises a stem pulling roller, a stem pulling cutting assembly and a mounting assembly. A stem pulling and cutting space is formed between the stem pulling rollers of the two stem pulling roller sets, and the stem pulling and cutting assembly is arranged on the peripheral side of the stem pulling roller body and used for pulling and cutting stems located in the stem pulling and cutting space. The installation assembly is connected to the feeding end of the stem pulling roller and used for being connected to the rack in a position adjustable mode in the first direction. By means of the stem pulling structure, the situation that stems are cut when entering the stem pulling cutting space and not pulled can be avoided, the stem pulling cutting effect is improved, and the problem that the size of stem chippings is too large is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of corn harvesters, in particular to a stem pulling structure and a corn harvester. Background Art

[0002] The stem pulling device is used in the corn harvester to pull the corn stalks, etc. When the corn ears are pulled to the ear picking plate above the stem pulling device while the stalks are moving, the corn ears are picked off. Existing corn harvesters are generally equipped with independent stem pulling devices, feeding devices and chopping devices. First, the stalks are fed into the stem pulling device by the feeding device. After the ears are picked off, the stalks pass through the stem pulling device and enter the chopping device for chopping. The above-mentioned corn harvester devices are scattered in layout and poor in integration, which is not conducive to the simplification of the structure.

[0003] In order to solve the above problems, the prior art proposes a stem pulling device that integrates feeding function, stem pulling function and cutting function. The stem pulling device is provided with two rotatable stem pulling rollers, and guide cones are provided at the ends of the stem pulling rollers to feed the stems between the two stem pulling rollers. Cutting blades and stem pulling plates are alternately provided along the circumference of the stem pulling rollers, and the stem pulling plates of the two stem pulling rollers act together to pull the stems, and the cutting blades of the two stem pulling rollers act together to cut the stems.

[0004] However, the two stem pulling rollers of the above-mentioned stem pulling device are fixed on the frame of the corn harvester, and the spacing between the two stem pulling rollers is fixed. For the stems with lower strength, when they enter between the two stem pulling rollers with a smaller spacing, they may be directly cut into two sections by the cutting blade without being pulled, resulting in the stem debris being too large in size and the stem pulling and cutting effect being poor, which is not conducive to the subsequent debris processing.

[0005] Therefore, there is an urgent need for a stem pulling structure and a corn harvester to solve the above problems. Utility Model Content

[0006] According to one aspect of the utility model, the purpose is to provide a stem pulling structure, which can prevent the stem from being cut just after entering the stem pulling and cutting space without being pulled, improve the stem pulling and cutting effect, and effectively avoid the problem of stem debris being too large in size.

[0007] It is suitable for the stem pulling and cutting process of stems with various cross-sectional diameters, effectively expanding the scope of application and improving the flexibility of use.

[0008] To achieve this purpose, the utility model adopts the following technical solutions:

[0009] The stem pulling structure comprises two stem pulling roller groups spaced apart along a first direction, wherein the stem pulling roller groups comprise:

[0010] A stem pulling roller, wherein a stem pulling and cutting space is formed between the stem pulling rollers of the two stem pulling roller groups;

[0011] A stem pulling and cutting assembly is arranged on the peripheral side of the stem pulling roller, and the stem pulling and cutting assembly is used to pull and cut the stems in the stem pulling and cutting space;

[0012] The mounting assembly is connected to the feeding end of the stem pulling roller, and the mounting assembly is used to be connected to the frame in an adjustable position along a first direction.

[0013] As a preferred solution of the stem pulling structure provided by the utility model, the stem pulling roller comprises:

[0014] A stem pulling roller body, wherein the stem pulling and cutting assembly is arranged on the peripheral side of the stem pulling roller body;

[0015] A guide cone, wherein the large end of the guide cone is coaxially connected to one end of the stem pulling roller body, and the mounting assembly is connected to the small end of the guide cone, and the guide cone can feed the stems into the stem pulling and cutting space.

[0016] As a preferred solution of the pull stem structure provided by the utility model, the mounting assembly includes a connecting plate, the small end of the guide cone is rotatably connected to the connecting plate, the connecting plate has a mounting hole, the mounting hole is long and extends along the first direction, and the mounting bolt is used to pass through the mounting hole and connect to the frame.

[0017] As a preferred solution of the pull stem structure provided by the utility model, the installation assembly also includes:

[0018] A connecting shaft, the connecting shaft being fixedly connected to the connecting plate;

[0019] A bearing, wherein the inner ring of the bearing is fixedly sleeved on the connecting shaft, and the outer ring of the bearing is fixedly connected to the guide cone.

[0020] As a preferred solution of the pull stem structure provided by the utility model, the installation assembly also includes an anti-winding part arranged on the connecting plate, the guide cone is provided with a mounting groove, the bearing is embedded in the mounting groove and is rotatably connected to the connecting plate, the anti-winding part is coaxially arranged with the connecting shaft, and closes the notch of the mounting groove.

[0021] As a preferred solution of the stem pulling structure provided by the utility model, the stem pulling roller group also includes an end connecting component, which is used to be fixed to the frame, and one end of the stem pulling roller body away from the guide cone is movably connected to the end connecting component.

[0022] As a preferred solution of the stem pulling structure provided by the utility model, the stem pulling cutting assembly includes multiple cutting pieces and multiple stem pulling pieces. The multiple cutting pieces and the multiple stem pulling pieces are alternately arranged on the stem pulling roller body along the circumferential direction. The stem pulling pieces are used to pull the stems, and the cutting pieces are used to cut the stems.

[0023] As a preferred solution of the stem pulling structure provided by the utility model, the cutting member comprises a first connecting portion and a blade portion connected to each other, the first connecting portion is connected to the stem pulling roller body, and the blade portion extends out of the stem pulling roller body;

[0024] The stem pulling member includes a second connecting portion and a stem pulling plate connected to each other at an angle, the second connecting portion is installed on the first connecting portion, the first end of the stem pulling plate is connected to the second end at an angle, and the second end of the stem pulling plate extends out of the stem pulling roller body and is set at an angle to the blade portion.

[0025] As a preferred solution of the stem pulling structure provided by the utility model, the distance between the blade of the blade portion and the center line of the stem pulling roller is not less than the distance between the second end of the stem pulling plate and the center line of the stem pulling roller.

[0026] According to another aspect of the utility model, an object is to provide a corn harvester, the corn harvester includes a cutting table, the cutting table includes a frame and a plurality of stem pulling structures as described in any one of the above schemes, and the stem pulling structure is arranged on the frame.

[0027] Beneficial effects of the utility model:

[0028] The stem pulling structure provided by the utility model includes two stem pulling roller groups spaced apart along a first direction. The stem pulling roller group includes a stem pulling roller, a stem pulling and cutting assembly and a mounting assembly. A stem pulling and cutting space is formed between the two stem pulling roller groups. The stem pulling and cutting assembly is arranged on the peripheral side of the stem pulling roller body, and can be used to pull and cut the stems in the stem pulling and cutting space. The mounting assembly is connected to the feeding end of the stem pulling roller, and the mounting assembly is used to be connected to the frame in an adjustable position along the first direction. In other words, according to the strength and toughness of the corn stalks to be harvested, the spacing between the feeding ends of the two stem pulling rollers is adjusted, which can prevent the spacing between the two feeding ends from being too small, resulting in the situation that the easily broken stems are cut into two sections when they just enter the stem pulling and cutting space without being pulled, thereby improving the stem pulling and cutting effect, and effectively avoiding the problem that the stem debris size is too large and is not conducive to subsequent debris processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view of the pull stem structure provided by an embodiment of the utility model;

[0030] Figure 2 yes Figure 1 Sectional view along AA direction;

[0031] Figure 3 It is an exploded schematic diagram of the stem pulling roller group provided in an embodiment of the utility model;

[0032] Figure 4 It is a schematic diagram of the installation assembly provided by the embodiment of the utility model;

[0033] Figure 5 It is a side view of the stem pulling roller group provided by an embodiment of the utility model.

[0034] In the figure:

[0035] 1. Stem pulling roller group;

[0036] 100, stem pulling roller body; 110, roller connecting shaft;

[0037] 200, mounting assembly; 210, connecting plate; 211, mounting hole; 220, connecting shaft; 230, anti-winding member;

[0038] 300, end connection assembly; 310, fixing plate; 320, connecting sleeve;

[0039] 400, guide cone; 410, cone; 420, spiral portion;

[0040] 500, bearings;

[0041] 600, cutting member; 610, first connecting portion; 620, blade portion;

[0042] 700, stem pulling member; 710, second connecting portion; 720, stem pulling plate;

[0043] 800. Connecting bolt. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] This embodiment provides a stem pulling structure and a corn harvester. The corn harvester includes a header, and the header includes a frame and a plurality of stem pulling structures provided in this embodiment. The stem pulling structure is arranged on the frame.

[0049] Figure 1 A front view of the pull stem structure provided by an embodiment of the utility model is shown; Figure 2 Show Figure 1 Sectional view along AA direction; Figure 3 The exploded schematic diagram of the stem pulling roller group provided by the embodiment of the utility model is shown. Figure 1-Figure 3 The stem pulling structure comprises two stem pulling roller groups 1 spaced apart along a first direction. The stem pulling roller group 1 comprises a stem pulling roller, a stem pulling cutting assembly and an installation assembly 200.

[0050] Specifically, a stem pulling and cutting space is formed between the two stem pulling roller groups 1, and the stem pulling roller includes a stem pulling roller body 100 and a guide cone 400. The stem pulling and cutting assembly is arranged on the peripheral side of the stem pulling roller body 100, and the stem pulling and cutting assembly can pull and cut the stems in the stem pulling and cutting space. The large end of the guide cone 400 is coaxially connected to one end of the stem pulling roller body 100, and the mounting assembly 200 is connected to the small end of the guide cone 400, and the guide cone 400 can feed the stems into the stem pulling and cutting space. The mounting assembly 200 is connected to the feeding end of the stem pulling roller body 100, and the mounting assembly 200 is used to be connected to the frame in an adjustable position along the first direction. Through the above arrangement, the distance between the feeding ends of the two stem pulling roller bodies 100 can be adjusted according to the strength, toughness and cross-sectional size of the corn stalks to be harvested. When the strength and toughness of the corn stalks to be harvested are low and the cross-sectional size is small, it can be judged that the stalks are easy to be cut. At this time, it is necessary to adjust and expand the distance between the feeding ends of the two stalk pulling roller bodies 100 to prevent the situation where the fragile stalks are cut into two sections as soon as they enter the stalk pulling and cutting space without being pulled due to the small distance between the feeding ends of the two stalk pulling roller bodies 100. This improves the stalk pulling and cutting effect and effectively avoids the problem of stalk debris being too large in size to be conducive to subsequent debris processing.

[0051] Continue to refer to Figure 1-Figure 3 The stem pulling and cutting assembly includes a plurality of cutting pieces 600 and a plurality of stem pulling pieces 700. The plurality of cutting pieces 600 and the plurality of stem pulling pieces 700 are alternately arranged on the stem pulling roller body 100 along the circumferential direction. When the two stem pulling roller bodies 100 rotate around their own axes in the direction of each other, when the stem pulling pieces 700 on the two stem pulling roller bodies 100 approach each other, the stems in the stem pulling and cutting space can be clamped, and the stems can be pulled by the rotation of the stem pulling roller body 100. Then, when the two cutting pieces 600 approach each other, the stems in the stem pulling and cutting space can be cut. During the rotation of the two stem pulling roller bodies 100, the pulling process and the cutting process are alternately performed, so that the stems with a longer length can be cut into multiple short-section fragments with a shorter length.

[0052] Specifically, refer to Figure 2 The cutting member 600 includes a first connecting portion 610 and a blade portion 620 which are connected to each other. The first connecting portion 610 is a plate-like structure, and its length is substantially equal to the length of the stem-pulling roller body 100. The first connecting portion 610 is connected to the side of the stem-pulling roller body 100. The blade portion 620 is integrally formed at the side edge of the first connecting portion 610, is parallel to the first connecting portion 610 and extends away from the stem-pulling roller body 100, and extends out of the stem-pulling roller body 100. The blade portion 620 can cut the stems.

[0053] For more details, please refer to Figure 2 The stem pulling member 700 includes a second connection portion 710 and a stem pulling plate 720 connected at an angle to each other, the second connection portion 710 is installed on the first connection portion 610, the first end of the stem pulling plate 720 is connected to the second end at an angle, the second end of the stem pulling plate 720 extends out of the stem pulling roller body 100 and is set at an angle to the blade portion 620. In this embodiment, the angle between the first end of the stem pulling plate 720 and the second end of the stem pulling plate 720 is a right angle, and the angle between the second end of the stem pulling plate 720 and the stem pulling plate 720 is a right angle. The stem pulling plate 720 can abut against the side of the stem.

[0054] More specifically, the distance between the blade of the blade portion 620 and the center line of the stem pulling roller is not less than the distance between the second end of the stem pulling plate 720 and the center line of the stem pulling roller.

[0055] More specifically, the stem pulling roller set 1 further includes a plurality of connecting bolts 800. The connecting bolts 800 are sequentially connected to the second connecting portion 710, the first connecting portion 610 and the stem pulling roller body 100, and are fastened by nuts on the side of the second connecting portion 710 away from the first connecting portion 610. Preferably, a plurality of connecting bolts 800 are evenly spaced along the length direction of the stem pulling roller body 100, thereby improving the connection reliability between the second connecting portion 710 and the first connecting portion 610 and the stem pulling roller body 100, and enabling the second connecting portion 710 and the first connecting portion 610 to be evenly stressed, thereby improving the reliability of the pulling and cutting process.

[0056] Figure 4 A schematic diagram showing an installation assembly provided by an embodiment of the utility model is shown; Figure 5 The side view of the stem pulling roller assembly provided by the embodiment of the utility model is shown. Figure 4 and Figure 5 The mounting assembly 200 provided in this embodiment includes a connecting plate 210. The feeding end of the stem pulling roller body 100 is fixedly connected to the connecting plate 210. The connecting plate 210 is provided with a mounting hole 211, and the mounting bolt can be adjusted and fixed in the mounting hole 211 along the spacing arrangement direction of the two stem pulling roller groups 1, and connected to the frame. The mounting hole 211 is specifically a waist-shaped hole, and the long axis direction of the mounting hole 211 is parallel to the arrangement direction of the two stem pulling roller groups 1.

[0057] Preferably, there are multiple mounting holes 211, which are spaced apart along the short axis direction on the connecting plate 210. Through the above arrangement, the connecting plate 210 and the frame can be connected by multiple mounting bolts, thereby improving the installation stability and reliability of the connecting plate 210.

[0058] Optionally, in other embodiments, there are multiple mounting holes 211, and mounting bolts can be selectively inserted into the mounting holes 211 and connected to the frame to adjust the mounting position of the connecting plate 210 on the frame.

[0059] Continue to refer to Figure 1 and Figure 3 The guide cone 400 includes a cone 410 and a spiral portion 420 circumferentially arranged along the cone 410. The cross-sectional area of ​​the cone 410 gradually decreases in the direction away from the stem pulling roller body 100. The spiral portions 420 of the two stem pulling roller groups 1 have opposite rotation directions, and the raised positions of the spiral portions 420 of the two stem pulling roller groups 1 are staggered with each other. When the two stem pulling roller bodies 100 rotate, the two guide cones 400 also rotate at the same time. Under the action of the spiral portions 420 with opposite rotation directions, the stems can be continuously fed into the stem pulling cutting space. At the same time, staggering the raised positions of the spiral portions 420 can effectively improve the stem feeding capacity and prevent clogging during stem feeding.

[0060] More specifically, the mounting assembly 200 further includes a connecting shaft 220 and a bearing 500. The connecting shaft 220 is relatively fixedly connected to the connecting plate 210 vertically and is fixedly arranged on the frame through the connecting plate 210. The inner ring of the bearing 500 is fixedly sleeved on the connecting shaft 220, and the outer ring of the bearing 500 is fixedly connected to the guide cone 400. The bearing 500 can improve the smoothness and stability of the coaxial rotation of the cone 410 relative to the connecting shaft 220.

[0061] More specifically, the mounting assembly 200 further includes an anti-winding member 230 disposed on the connecting plate 210. The guide cone 400 is provided with a mounting groove along the axial direction, and the bearing 500 is embedded in the mounting groove and rotatably connected to the connecting plate 210. The anti-winding member 230 is coaxially arranged with the connecting shaft 220, and is staggered with the small end of the guide cone 400 in the axial direction, wrapped around the outer peripheral side of the small end of the guide cone 400, and can close the notch of the mounting groove, thereby blocking the bearing 500, preventing the stems and weeds from winding around the bearing 500, causing the stem pulling roller body 100 to be unable to rotate normally.

[0062] Continue to refer to Figure 1 and Figure 3The stem pulling roller group 1 also includes an end connection assembly 300. The end connection assembly 300 is used to be fixed to the frame, and the end of the stem pulling roller body 100 away from the guide cone 400 is movably connected to the end connection assembly 300. The end connection assembly 300 specifically includes a fixed disk 310 and a connecting sleeve 320. The fixed disk 310 can be connected to the frame, and the connecting sleeve 320 is fixedly connected to the fixed disk 310. The end of the stem pulling roller body 100 away from the feeding end is coaxially provided with a roller connecting shaft 110, and the roller connecting shaft 110 is rotatably inserted in the connecting sleeve 320.

[0063] Specifically, in order to adapt to the function of adjusting the spacing between the feeding ends of the two stem pulling roller bodies 100, the roller connecting shaft 110 is movably connected to the end connecting assembly 300 through a movable connecting assembly, so as to leave an adjustment gap for the position adjustment of the feeding end of the stem pulling roller body 100, thereby facilitating the adjustment of the feeding end position.

[0064] Specifically, in this embodiment, the movable connection assembly specifically adopts the ball joint connection principle. The end of the roller connecting shaft 110 is provided with a ball head, which is movably embedded in the position where the connecting sleeve 320 is connected to the fixed disk 310, and the inner diameter of the connecting sleeve 320 is larger than the outer diameter of the roller connecting shaft 110. Through the above arrangement, the roller connecting shaft 110 can be deflected to a certain extent in the connecting sleeve 320, which is suitable for adjusting the feeding end position.

[0065] As an option, in other embodiments, the movable connection component can also specifically adopt the connection principle of a spline shaft and a spline sleeve. The spline shaft is coaxially arranged at the end of the roller connecting shaft 110, and a spline sleeve is arranged at the position where the connecting sleeve 320 is connected to the fixed disk 310. The spline shaft can be inserted into the spline sleeve, and the two are clearance-matched to achieve a movable connection. The inner diameter of the connecting sleeve 320 is larger than the outer diameter of the roller connecting shaft 110. Through the above arrangement, the roller connecting shaft 110 can be deflected to a certain extent in the connecting sleeve 320, which is adapted to the adjustment of the feeding end position.

[0066] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Pull stem structure, characterized in that: It comprises two stem-pulling roller groups (1) arranged at intervals along a first direction, and the stem-pulling roller group (1) comprises: A stem pulling roller, wherein a stem pulling and cutting space is formed between the stem pulling rollers of the two stem pulling roller groups (1); A stem pulling and cutting assembly is arranged on the peripheral side of the stem pulling roller, and the stem pulling and cutting assembly is used to pull and cut the stems in the stem pulling and cutting space; The mounting assembly (200) is connected to the feeding end of the stem pulling roller, and the mounting assembly (200) is used to be connected to the frame in a positionally adjustable manner along a first direction.

2. The stem pull structure according to claim 1, characterized in that: The stem pulling roller comprises: A stem pulling roller body (100), wherein the stem pulling and cutting assembly is arranged on the peripheral side of the stem pulling roller body (100); A guide cone (400), wherein the large end of the guide cone (400) is coaxially connected to one end of the stem pulling roller body (100), and the mounting assembly (200) is connected to the small end of the guide cone (400), and the guide cone (400) can feed the stems into the stem pulling and cutting space.

3. The stem pull structure according to claim 2, characterized in that: The mounting assembly (200) comprises a connecting plate (210), the small end of the guide cone (400) is rotatably connected to the connecting plate (210), the connecting plate (210) is provided with a mounting hole (211), the mounting hole (211) is in an elongated strip shape and extends along a first direction, and a mounting bolt is used to pass through the mounting hole (211) and be connected to the frame.

4. The pull stem structure according to claim 3, characterized in that: The installation assembly (200) further comprises: A connecting shaft (220), wherein the connecting shaft (220) is fixedly connected to the connecting plate (210); A bearing (500), wherein the inner ring of the bearing (500) is fixedly sleeved on the connecting shaft (220), and the outer ring of the bearing (500) is fixedly connected to the guide cone (400).

5. The stem pull structure according to claim 4, characterized in that: The mounting assembly (200) further comprises an anti-winding member (230) arranged on the connecting plate (210); the guide cone (400) is provided with a mounting groove; the bearing (500) is embedded in the mounting groove and is rotatably connected to the connecting plate (210); the anti-winding member (230) is coaxially arranged with the connecting shaft (220) to close the notch of the mounting groove.

6. The stem pull structure according to claim 2, characterized in that: The stem pulling roller group (1) further comprises an end connection assembly (300), wherein the end connection assembly (300) is used to be fixed to the frame, and one end of the stem pulling roller body (100) away from the guide cone (400) is movably connected to the end connection assembly (300).

7. The pull stem structure according to any one of claims 2 to 6, characterized in that: The stem pulling and cutting assembly comprises a plurality of cutting pieces (600) and a plurality of stem pulling pieces (700). The plurality of cutting pieces (600) and the plurality of stem pulling pieces (700) are alternately arranged on the stem pulling roller body (100) along the circumferential direction. The stem pulling pieces (700) are used for pulling the stems, and the cutting pieces (600) are used for cutting the stems.

8. The stem pulling structure according to claim 7, characterized in that: The cutting member (600) comprises a first connecting portion (610) and a blade portion (620) which are connected to each other, wherein the first connecting portion (610) is connected to the stem-pulling roller body (100), and the blade portion (620) extends out of the stem-pulling roller body (100); The stem pulling member (700) includes a second connecting portion (710) and a stem pulling plate (720) connected to each other at an angle, wherein the second connecting portion (710) is installed on the first connecting portion (610), the first end of the stem pulling plate (720) is connected to the second end at an angle, and the second end of the stem pulling plate (720) extends out of the stem pulling roller body (100) and is arranged at an angle to the blade portion (620).

9. The pull stem structure according to claim 8, characterized in that: The distance between the blade of the blade portion (620) and the center line of the stem pulling roller is not less than the distance between the second end of the stem pulling plate (720) and the center line of the stem pulling roller.

10. A corn harvester, characterized in that: It comprises a cutting platform, which comprises a frame and a plurality of pull stem structures according to any one of claims 1 to 9, wherein the pull stem structures are arranged on the frame.

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