Novel edible sunflower thresher

Abstract

The utility model discloses a novel edible sunflower thresher, which belongs to the technical field of agricultural machinery and is used for solving the problems of high grain breakage rate, low threshing rate and straw winding and blockage caused by structural design defects of a traditional thresher. The thresher comprises a rack, the interior of the rack is divided into a threshing cavity and a separating cavity through a partition plate, and a feeding port is formed in the top of the rack; a threshing shaft driven by a motor is installed in the threshing cavity, the included angle between the axis of the threshing shaft and the horizontal direction is 0-10 degrees, the threshing shaft is divided into a feeding end, a core threshing area and a discharging end, the feeding end is higher than the discharging end, the feeding end is provided with spiral teeth with the helix angle ranging from 15 degrees to 25 degrees and the screw pitch ranging from 200 mm to 300 mm, arch-shaped threshing teeth are distributed in the core threshing area in a staggered mode in the circumferential direction, and a flexible rubber scraper is installed at the discharging end. And a filter screen is arranged below the clapboard close to the discharge end. According to the utility model, efficient stripping of edible sunflower seeds and accurate separation of impurities are realized through spiral tooth guiding, arched tooth rubbing and flexible scraper blade collaborative deslagging in combination with filter screen screening and fan airflow cleaning.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology. More specifically, this utility model relates to a novel sunflower threshing machine. Background Technology

[0002] Existing sunflower threshing equipment has several technical limitations in practical applications, mainly manifested in high seed breakage rates, insufficient threshing efficiency, and frequent straw entanglement and blockage during operation. Specifically, traditional threshing machines often use rigid threshing elements (such as straight teeth or hook teeth) to impact the sunflower discs for threshing. The tooth curvature of this type of structure is uniform and the impact angle is fixed, causing the seeds to be subjected to instantaneous concentrated loads during threshing, which easily leads to skin cracking or internal damage. In addition, the rigid tooth surface lacks a buffer structure and has poor adaptability to changes in material thickness. Fluctuations in the feed rate can easily cause local overload, further aggravating seed damage.

[0003] Regarding threshing efficiency, existing equipment generally suffers from unreasonable threshing path design. Conventional axially arranged threshing teeth form a linear threshing trajectory during material transport, resulting in the outer layer of seeds being peeled off while the inner layer remains due to insufficient continuous rubbing. This phenomenon is closely related to the spatial distribution density and angle of the threshing teeth: if the tooth spacing is too large, the threshing coverage area is insufficient; if the angle design is inappropriate, the material is prone to slippage rather than effective tumbling within the threshing chamber, affecting threshing uniformity.

[0004] The problem of straw entanglement and blockage mainly stems from insufficient coordination between the slag discharge structure and the threshing elements in the threshing chamber. Traditional equipment often uses rigid scrapers or screens with fixed gaps for slag discharge. When straw fragments mix with incompletely detached sunflower heads, they easily accumulate at the end of the threshing chamber. This is especially true for sunflower varieties with high flexible fiber content, where the straw is easily entangled at the root of the threshing teeth due to the high-speed rotating components, resulting in increased frequency of equipment shutdowns for cleaning.

[0005] The core reasons for the above problems can be summarized in three aspects: First, the matching degree between the geometric parameters and mechanical properties of the threshing elements is insufficient, failing to balance the threshing intensity and grain protection requirements; second, the threshing path design lacks a gradient action mechanism, and the material fails to achieve layered and gradual stripping within the threshing chamber; third, the slag discharge system lacks adjustment capability and cannot respond to changes in material state in real time. In the process of technological improvement, the main difficulty lies in how to achieve the following goals through mechanical structural innovation: constructing multi-stage kneading threshing units within a limited space to ensure sufficient threshing force while avoiding local stress concentration; designing an adaptive slag discharge mechanism to improve slag discharge efficiency without increasing power consumption; and optimizing the internal flow field of the threshing chamber to reduce material retention and the risk of secondary crushing. These requirements place high demands on the morphological design of the threshing elements, the matching of material properties, and the coordination of motion parameters, for which existing technologies have not yet found effective systematic solutions. Utility Model Content

[0006] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0007] Another objective of this invention is to provide a novel sunflower threshing machine that can effectively improve the threshing rate and reduce the breakage rate.

[0008] To achieve these objectives and other advantages according to this utility model, a novel sunflower threshing machine is provided, comprising a frame, wherein a threshing chamber and a separating chamber are arranged from top to bottom inside the frame and separated by a partition; the top of the frame is provided with a feed inlet communicating with the threshing chamber; wherein,

[0009] The threshing chamber is fitted with a threshing shaft driven by a motor. The angle between the axis of the threshing shaft and the horizontal direction is 0~10°. The shaft is divided into a feeding end, a core threshing zone and a discharge end along the axis. The feeding end is higher than the discharge end. The feeding end is provided with helical teeth with a helix angle of 15°~25° and a pitch of 200~300 mm. The core threshing zone has multiple arc-shaped threshing teeth arranged alternately along the circumference of the threshing shaft. The discharge end is equipped with multiple flexible rubber scrapers. A filter screen is provided on the partition near the lower part of the discharge end.

[0010] The bottom of the separation chamber is provided with a sunflower seed collection box and an impurity collection box. The sunflower seed collection box is located directly below the filter screen, and a sieve is installed on the top of the sunflower seed collection box. A fan is installed on the side wall of the separation chamber near the sunflower seed collection box.

[0011] Preferably, a pair of rubber chain wheels are symmetrically installed at the bottom of the frame, and their surfaces are provided with continuously distributed anti-slip ridges.

[0012] Preferably, the bow-shaped threshing teeth have a bow-shaped curved structure, and their working arc surface is composed of two composite arcs. The radius of curvature of the front arc is 28~32 mm, and the radius of curvature of the rear arc is 18~22 mm. The two arcs are connected by a smooth transition section to form a kneading surface that is gentle at the front and steep at the back.

[0013] Preferably, the tip of the bow-shaped threshing tooth is provided with a planar crushing band with a width of 3 to 5 mm along the arc length direction, the surface of the crushing band is provided with micro-protruding texture, the spacing between adjacent bow-shaped threshing teeth is 40 to 50 mm, and they are arranged in a spiral staggered manner along the circumferential direction of the threshing axis, forming a misalignment angle of 50° to 70° between adjacent teeth.

[0014] Preferably, the thickness of the flexible rubber scraper is 8-12 mm.

[0015] Preferably, a motor is mounted on the top of the frame, and one end of the threshing shaft rotates out of the frame through a sealed bearing and is driven by a chain to the motor shaft.

[0016] Preferably, a spiral bevel gear is coaxially fixed to the through end of the threshing shaft, and the rotating shaft of the fan rotates through the frame via a sealed bearing and is coaxially fixed to a transmission gear, wherein the spiral bevel gear meshes with the transmission gear and rotates.

[0017] Preferably, the spiral teeth, the bow-shaped threshing teeth, and the flexible rubber scraper are at the same height, and the inner diameter of the threshing chamber matches the height of the spiral teeth, the bow-shaped threshing teeth, and the flexible rubber scraper.

[0018] This utility model has at least the following beneficial effects: The novel sunflower seed thresher described in this utility model, through a layered design of the threshing chamber and separation chamber, combined with the synergistic effect of spiral teeth, bow-shaped threshing teeth, and flexible rubber scrapers, achieves gradient threshing and efficient separation of sunflower seeds. The spiral teeth propel the sunflower disc to move axially stably, preventing material accumulation; the composite curved surface design of the bow-shaped teeth enhances the kneading effect, reduces the instantaneous impact load on the seeds, thus increasing the threshing rate and reducing the breakage rate. The flexible scraper and filter screen form a slag discharge channel, which, combined with the separation chamber screen and directional airflow, effectively reduces straw entanglement and results in a low impurity content in the seeds.

[0019] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the novel sunflower thresher according to one of the technical solutions of this utility model;

[0021] Figure 2 This is a cross-sectional view of the novel sunflower thresher described in one of the technical solutions of this utility model. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0023] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0024] like Figure 1-2As shown, this utility model provides a novel sunflower threshing machine, including a frame 100, inside which a threshing chamber 102 and a separation chamber 103 are arranged from top to bottom by a partition 101. The top of the frame 100 is provided with a feed inlet 104 communicating with the threshing chamber 102; wherein,

[0025] The threshing chamber 102 is fitted with a threshing shaft 106 driven to rotate by a motor 105. The angle between the axis of the threshing shaft 106 and the horizontal direction is 0~10°. It is divided into a feeding end, a core threshing zone and a discharge end along the axis. The feeding end is higher than the discharge end. The feeding end is provided with helical teeth 107 with a helix angle of 15°~25° and a pitch of 200~300 mm. The core threshing zone is provided with multiple arc-shaped threshing teeth 108 arranged alternately along the circumference of the threshing shaft 106. The discharge end is equipped with multiple flexible rubber scrapers 109. The partition 101 is provided with a filter screen 110 near the lower part of the discharge end.

[0026] The bottom of the separation chamber 103 is provided with a sunflower seed collection box 111 and an impurity collection box 112. The sunflower seed collection box 111 is located directly below the filter screen 110, and a screen 113 is installed on the top of the sunflower seed collection box 111. A fan 114 is installed on the side wall of the separation chamber 103 near the sunflower seed collection box 111.

[0027] In the above technical solution, the sunflower seed thresher adopts a layered cavity structure. The frame 100 is divided into a threshing chamber 102 and a separation chamber 103 by a horizontal partition 101. A threshing shaft 106 is installed in the threshing chamber 102 at an inclined angle, with its axis forming a slight angle with the horizontal direction. The feed end is slightly higher than the discharge end, forming a material self-flow channel. The surface of the threshing shaft 106 is divided into three sections: the feed end is welded with spiral teeth 107, the teeth being spirally distributed along the axial direction; multiple sets of bow-shaped threshing teeth 108 are fixed circumferentially in the core threshing zone; and a flexible rubber scraper 109 is installed at the discharge end, with a slag discharge gap formed between the scraper end and the filter screen 110. The bottom of the separation chamber 103 is equipped with a sunflower seed collection box 111 and an impurity collection box 112. A screen 113 is installed on the top of the collection box, and a centrifugal fan is fixed to the side wall, with the fan outlet angled towards the surface of the screen 113. During operation, sunflower seeds enter the threshing chamber 102 through the feed inlet 104 at the top of the frame 100. Spiral teeth 107 push the sunflower discs axially to the core threshing area. Arched threshing teeth 108 knead and separate the seeds from the straw. A flexible scraper pushes the residue to the filter screen 110 area. The filter screen 110 intercepts any unthreshed material, while seeds pass through the screen 113 and fall into the sunflower seed collection box 111. Light impurities are blown into the impurity collection box 112 by the airflow from the fan 114. The threshing shaft 106 and the fan are linked via a gear set to ensure synchronized threshing and cleaning actions. The layered chamber design optimizes the material flow path and reduces seed retention time; the composite curved surface structure of the arched threshing teeth 108 enhances the kneading effect and reduces the risk of rigid impact; the cooperation between the flexible scraper and the filter screen 110 reduces straw entanglement and blockage. The 113 screen works in synergy with the directional airflow to improve the accuracy of impurity separation. The overall structure takes into account both threshing efficiency and grain protection, making it suitable for continuous operation of materials with different moisture levels.

[0028] In another technical solution, a pair of rubber track wheels 200 are symmetrically installed at the bottom of the frame 100, and their surfaces are provided with continuously distributed anti-slip ridges. In this technical solution, a pair of rubber track wheels 200 are symmetrically installed at the bottom of the frame 100, and their surfaces are provided with continuously distributed anti-slip ridges. The track wheels are connected to the frame 100 via axles, and the axles are fixed at both ends with flange-type bearing seats to ensure rotational stability. During operation, the rubber track wheels 200 support the overall weight of the equipment and generate traction through contact with the ground via the anti-slip ridges. On soft or slippery ground, the ridges embed into the surface soil, increasing adhesion and reducing slippage or sinking; on hard surfaces, the elastic deformation of the rubber layer buffers vibration, reducing the impact on the internal structure of the threshing chamber 102. During equipment movement, the track wheels adaptively adjust the grounding pressure according to the terrain undulations to ensure machine stability. The wheel surface drainage grooves can quickly drain mud and water, preventing wheel slippage or rubber layer peeling. The anti-slip ridges on the rubber track wheels significantly improve the equipment's maneuverability in complex terrain, reducing power loss and tire wear. The combination of a wear-resistant rubber layer and metal wheel hubs enhances structural durability and extends service life. The symmetrical installation reduces the risk of center of gravity shift, improves movement stability, avoids fluctuations in threshing efficiency caused by machine tilting, and adapts to various field operation environments.

[0029] In another technical solution, the bow-shaped threshing tooth 108 has a bow-shaped curved structure, and its working arc surface is composed of two composite arcs. The radius of curvature of the front arc is 28-32 mm, and the radius of curvature of the rear arc is 18-22 mm. The two arcs are connected by a smooth transition section to form a kneading surface that is gentle at the front and steep at the back. In this technical solution, the main body of the bow-shaped threshing tooth 108 is formed by an integrated casting process, and the material is 65Mn alloy steel. After quenching and tempering, the hardness reaches HRC45-50. Its working arc surface is composed of two composite arcs: the radius of curvature of the front arc is 28-32 mm, which is used for initial contact with the threshing disc and to disperse the impact force; the radius of curvature of the rear arc is 18-22 mm, which is used to enhance the tearing effect. The two arcs are connected by a smooth transition section of 10-15 mm in length to form a kneading surface that is gentle at the front and steep at the back. During operation, the threshing disc is conveyed to the area of ​​the bow-shaped threshing tooth 108 by the spiral tooth 107. The gently curved front section first contacts the sunflower disc surface, gently rubbing away the outer layer of seeds. The steeper curved rear section then cuts into the deeper layers of the disc, using the shear force generated by the abrupt change in curvature to tear the straw fibers. The smooth design of the transition section ensures even force distribution across the disc, reducing instantaneous impact on the seeds. The composite arc structure, through its gradual curve gradient, achieves layered peeling of the disc, reducing the risk of breakage due to concentrated force on the seeds. The gently curved front section reduces impact force, while the steeper curved rear section enhances threshing strength, optimizing the balance between threshing efficiency and breakage rate.

[0030] In another technical solution, the tip of the bow-shaped threshing teeth 108 has a planar crushing band with a width of 3-5 mm along the arc length direction. The surface of the crushing band is provided with micro-protruding texture. The spacing between adjacent bow-shaped threshing teeth 108 is 40-50 mm, and they are arranged in a spiral staggered pattern along the circumference of the threshing axis 106, forming a misalignment angle of 50°-70° between adjacent teeth. In this technical solution, the tip of the bow-shaped threshing teeth 108 is machined with a planar crushing band with a width of 3-5 mm along the arc length direction. The surface of the crushing band is formed with micro-protruding texture by laser etching, with a texture depth of 0.1-0.3 mm and a density of 15-20 protrusions per square millimeter. The spacing between adjacent bow-shaped threshing teeth 108 is set to 40-50 mm, and they are arranged in a spiral trajectory along the circumference of the threshing axis 106. The installation angle difference between adjacent teeth is controlled within the range of 50°-70°, forming a cross-covering threshing area. During operation, after the sunflower disc enters the threshing zone, the micro-convex texture of the crushing band at the tooth tip increases the friction with the material, preventing the sunflower disc from slipping. The spirally arranged, staggered, arched teeth create a multi-directional kneading force field, and the staggered angles of adjacent teeth ensure that the threshing action covers different phase areas, reducing blind spots in the threshing process. After threshing, the grains and straw are separated through gaps, and a flexible scraper pushes the residue to the discharge port, completing the continuous threshing process. This technical solution enhances material gripping ability and expands the threshing coverage area through the design of the planar crushing band, reducing grain residue. The micro-convex texture reduces the probability of material slippage, and the staggered angle layout optimizes the threshing trajectory, avoiding grain damage caused by repeated impacts.

[0031] In another technical solution, the thickness of the flexible rubber scraper 109 is 8-12 mm. In this solution, the flexible rubber scraper 109 is made of a composite molding material of polyurethane and a nylon fiber reinforcement layer, with a Shore hardness range of A80-90. The 8-12 mm thickness scraper design balances the requirements of flexibility and abrasion resistance; the polyurethane matrix reduces damage to the grain surface, and the nylon fiber reinforcement layer improves tear resistance.

[0032] In another technical solution, a motor 105 is mounted on the top of the frame 100. One end of the threshing shaft 106 rotatably extends out of the frame 100 via a sealed bearing and is driven by a chain to the shaft of the motor 105. In this technical solution, the motor 105 is fixedly mounted on the top of the frame 100, and the output shaft of the motor 105 is connected to the drive sprocket via a coupling. One end of the threshing shaft 106 rotatably extends out of the side wall of the frame 100 via a sealed bearing (a labyrinth seal structure can be selected), and a driven sprocket is mounted on the extending end. The drive sprocket and the driven sprocket are driven by a double-row roller chain. The outer ring of the sealed bearing is fixed to the side wall of the frame 100 via a flange seat, and the inner ring is interference-fitted with the threshing shaft 106. The bearing grease chamber is filled with lithium-based grease. The base of the motor 105 is equipped with a shock-absorbing rubber pad, and the bolt hole spacing matches the reserved mounting position on the top beam of the frame 100. After the motor 105 is started, the power drives the threshing shaft 106 to rotate via chain transmission. The tooth ratio of the driving sprocket to the driven sprocket ensures that the threshing shaft 106 rotates at a stable speed of 200-300 rpm. The labyrinth structure of the sealed bearing prevents dust from entering the bearing interior, and the grease reduces frictional loss. Chain tension is controlled by an adjustable tension wheel installed in a groove on the side wall of the frame 100; after the bolts are tightened, the chain sag remains within 10-15 mm. The rubber pad on the motor 105 base absorbs vibration, reduces noise, and extends the life of transmission components. The chain drive structure simplifies the power transmission path, and the chain can be quickly replaced during maintenance by adjusting the tension wheel, reducing downtime. The dustproof design of the sealed bearing reduces grease contamination and extends bearing life. The optimized sprocket tooth ratio of the threshing shaft 106 optimizes torque output to adapt to the threshing resistance requirements of materials with different moisture contents. The top-mounted motor 105 saves internal space in the frame 100, facilitating heat dissipation and maintenance. The overall transmission system operates stably with low power loss, making it suitable for long-term continuous operation.

[0033] In another technical solution, a spiral bevel gear is coaxially fixed to the through end of the threshing shaft 106. The rotating shaft of the fan 114 passes through the frame 100 via a sealed bearing and is coaxially fixed to a transmission gear. The spiral bevel gear meshes with the transmission gear. In this technical solution, the through end of the threshing shaft 106 is coaxially fixed to the spiral bevel gear via a key connection. The rotating shaft of the fan 114 passes through the side wall of the frame 100 via a sealed bearing (a labyrinth seal structure can be selected). A transmission gear is installed at the through end, and the gear module matches the spiral bevel gear to ensure smooth meshing. The outer ring of the sealed bearing is fixed to the side wall of the frame 100 via a flange seat, and the inner ring is interference-fitted with the shaft. The bearing cavity is filled with lithium-based grease. After starting the motor 105, the threshing shaft 106 drives the spiral bevel gear to rotate, which in turn drives the transmission gear on the fan 114 shaft to rotate synchronously through meshing transmission. The gear ratio between the spiral bevel gear and the drive gear adjusts the fan 114 speed to 0.8-1.2 times the threshing shaft 106 speed, ensuring that the airflow cleaning and threshing rhythm are matched. The labyrinth structure of the sealed bearing prevents dust from entering the bearing interior, and grease reduces friction loss. The meshing design of the spiral bevel gear and the drive gear enables synchronous drive of the threshing shaft 106 and the fan 114, reducing the need for an independent power source and simplifying the transmission system structure. The gear material and heat treatment process improve wear resistance, and the optimized gear ratio adapts to the cleaning airflow requirements of different materials. The sealed bearing and lubrication design extend component life and reduce maintenance frequency.

[0034] In another technical solution, the spiral teeth 107, the arc-shaped threshing teeth 108, and the flexible rubber scraper 109 are at the same height, and the inner diameter of the threshing chamber 102 matches the height of the spiral teeth 107, the arc-shaped threshing teeth 108, and the flexible rubber scraper 109. In this technical solution, the spiral teeth 107, the arc-shaped threshing teeth 108, and the flexible rubber scraper 109 are installed at equal intervals along the threshing shaft using bolts or slots. The spiral teeth are located at the feed end, the arc-shaped teeth are distributed in the core threshing zone, and the scraper is fixed at the discharge end, maintaining a consistent radial height after installation. After the material enters the threshing chamber, the spiral teeth push the threshing disc axially at a uniform height, and the arc-shaped teeth and scraper act synchronously, ensuring that the threshing disc is subjected to uniform force throughout the entire path. The matching inner diameter of the threshing chamber restricts the radial diffusion of the material. The guiding action of the spiral teeth, the kneading action of the arc-shaped teeth, and the slag discharge action of the scraper are completed collaboratively within the same radius of action, reducing energy loss caused by height differences. After threshing, the grains and straw are separated by a filter screen, leaving no dead corners inside the threshing chamber.

[0035] In another technical solution, a drive operation box 300 is installed on the side wall of the frame 100. The drive operation box 300 integrates a control module, which is electrically connected to the motor 105 and fan 114 via cables. The surface of the drive operation box 300 may be equipped with an emergency stop button, a power switch, a speed adjustment knob, indicator lights, etc. The box interior is equipped with an overload protection circuit and a dustproof and heat dissipation structure. The drive operation box 300 may use an aluminum alloy shell with an IP65 protection rating, and a PLC control module and a frequency converter are installed inside. The PLC control module is connected to the encoder of the motor 105 and the Hall sensor of the fan 114 via an RS485 interface, collecting speed data in real time and feeding it back to the controller. The frequency converter adjusts the input frequency of the motor 105 according to the knob setting, achieving stepless speed regulation of the threshing shaft 106 within the range of 200-400 rpm. A heat dissipation grille may be provided on the top of the box, and an axial fan and dust filter are installed inside to ensure stable heat dissipation of the electronic components. The emergency stop button can be designed with a red mushroom head, which will immediately cut off the main circuit when pressed, ensuring safe operation in emergency situations.

[0036] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0037] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A new sunflower thresher characterized in that, The machine includes a frame, inside which a threshing chamber and a separation chamber are arranged from top to bottom by a partition. A feed inlet communicating with the threshing chamber is located at the top of the frame. The threshing chamber is fitted with a threshing shaft driven by a motor. The angle between the axis of the threshing shaft and the horizontal direction is 0~10°. The shaft is divided into a feeding end, a core threshing zone and a discharge end along the axis. The feeding end is higher than the discharge end. The feeding end is provided with helical teeth with a helix angle of 15°~25° and a pitch of 200~300 mm. The core threshing zone has multiple arc-shaped threshing teeth arranged alternately along the circumference of the threshing shaft. The discharge end is equipped with multiple flexible rubber scrapers. A filter screen is provided on the partition near the lower part of the discharge end. The bottom of the separation chamber is provided with a sunflower seed collection box and an impurity collection box. The sunflower seed collection box is located directly below the filter screen, and a sieve is installed on the top of the sunflower seed collection box. A fan is installed on the side wall of the separation chamber near the sunflower seed collection box.

2. The novel sunflower seed thresher as claimed in claim 1, wherein, A pair of rubber chain wheels are symmetrically installed at the bottom of the frame, and their surfaces are provided with continuously distributed anti-slip ridges.

3. The novel sunflower thresher as described in claim 1, characterized in that, The bow-shaped threshing teeth have a bow-shaped curved structure, and their working arc surface is composed of two composite arcs. The radius of curvature of the front arc is 28~32 mm, and the radius of curvature of the rear arc is 18~22 mm. The two arcs are connected by a smooth transition section to form a kneading surface that is gentle at the front and steep at the back.

4. The novel sunflower seed thresher as claimed in claim 3, wherein, The top of the bow-shaped threshing teeth has a planar crushing band with a width of 3-5 mm along the arc length direction. The surface of the crushing band is provided with micro-protruding texture. The spacing between adjacent bow-shaped threshing teeth is 40-50 mm. They are arranged in a spiral staggered manner along the circumferential direction of the threshing axis, and a misalignment angle of 50°-70° is formed between adjacent teeth.

5. The novel sunflower seed thresher as claimed in claim 1, wherein, The thickness of the flexible rubber scraper is 8~12mm.

6. The novel sunflower seed thresher as claimed in claim 1, wherein, A motor is mounted on the top of the frame, and one end of the threshing shaft passes through the frame via a sealed bearing and is driven by a chain to the motor shaft.

7. The novel sunflower seed thresher as claimed in claim 6, wherein, The threshing shaft has a spiral bevel gear coaxially fixed to its exit end. The fan's rotating shaft passes through the frame via a sealed bearing and is coaxially fixed to a transmission gear. The spiral bevel gear meshes with the transmission gear and rotates.

8. The novel sunflower seed thresher as claimed in claim 1, wherein, The spiral teeth, the bow-shaped threshing teeth, and the flexible rubber scraper are all at the same height, and the inner diameter of the threshing chamber matches the height of the spiral teeth, the bow-shaped threshing teeth, and the flexible rubber scraper.

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